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    Xinjiang Oil & Gas    2024, 20 (1): 0-0.  
    Abstract88)      PDF (13817KB)(331)       Save
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    Research Progress on Capture of CO2 by Alcohol Amine Absorption Method
    YANG Tianmeng, YANG Fan, REZEY Rehemtuli, GOU Guolei, LI Xiuhui, HOU Junwei
    Xinjiang Oil & Gas    2024, 20 (1): 52-60.   DOI: 10.12388/j.issn.1673-2677.2024.01.007
    Abstract279)      PDF (3625KB)(313)       Save

    CO2 capture,utilization,and storage are the main technologies to cope with the greenhouse climate,achieve the strategic goal of carbon peak and neutralization,lead the transformation and upgrading of the global energy system,and promote the green and sustainable development of energy. The chemical absorption methods have the characteristics of high absorption efficiency and large processing capacity,most suitable for large-scale carbon capture in various industries. Among them,the alcoho lamine method is the most widely used and the most effective. After absorbing CO2,the alcoholamine solution becomes an alcoholamine-rich solution,which can be recovered by desorption treatment for cyclic utilization. However,in the process of CO2 capture by the existing alkanolamine absorbent,there are some disadvantages such as high energy consumption and great loss of absorbent,and it is necessary to improve the alcoholamine absorber to realize high absorption efficiency and a feasible process with low regeneration energy consumption. To solve the problems of large loss of absorbent and low regeneration rate,a new mixed alcoholamine absorber was developed for improvement. For the problem of high energy consumption for regeneration,the traditional thermal desorption process is improved and microwave desorption technology is selected. This paper introduces the mechanism and characteristics of CO2 absorption by alcoho lamine method,summarizes the basis for improving the mixed alcoholamine absorber,and expounds on the principle and characteristics of CO2 capture through microwave-assisted alcoholamine,providing a reference for industrial carbon capture and environmental protection.

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    Research Progress and Development Direction of Hydrofracturing Design Models
    ZHANG Shicheng, CHEN Ming, MA Xinfang, ZOU Yushi, GUO Tiankui
    Xinjiang Oil & Gas    2021, 17 (3): 67-73.  
    Abstract429)      PDF (2607KB)(299)       Save
    Hydrofracturing model is the basis of hydrofracturing design,and also the crux where current bottlenecking problems lie. In order to promote the development of fracturing design models and softwares in China,fracture propagation models,numerical methods and popular commercial softwares for hydrofracturing are systematically analyzed,and their future development orientations are predicted. Research findings show that (1) Planar and complex fracture models are different in application conditions and accuracy. Most commercial softwares are planar fracture models-based,and most complex fracture models are pseudo-three-dimensional ones. (2) It is the focus of fracturing design softwares to develop models with satisfactory accuracy and efficiency. (3) Artificial intelligence data-driven fracture analysis,and fracture parameter inversion based on micro-seismic and fiber optic logging are the development orientation of fracturing design models.
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    The Application Status and Prospect of DTS/DAS in Fracturing Monitoring of Horizontal Wells#br#
    LI Haitao, LUO Hongwen, XIANG Yuxing, AN Shujie, LI Ying, JIANG Beibei, XIE Bin, XIN Ye
    Xinjiang Oil & Gas    2021, 17 (4): 62-73.  
    Abstract402)      PDF (5344KB)(231)       Save
    The fractured horizontal well technology has been widely used in unconventional reservoir development in China,but there are still many technical problems in monitoring the fracturing performance of horizontal wells. The distributed optical fiber monitoring technology has been found with rapid progress over recent years,and developed the distributed temperature/acoustic sensing(DTS/DAS)technology,which has been widely applied to the fracturing performance monitoring of unconventional oil and gas reservoirs in the United States,Canada et al.,with good application results. In this paper,the basic principles of distributed optical fiber temperature/acoustic sensing are described,and the latest applications and research progress of DTS/DAS in fracturing monitoring of horizontal wells are summarized,including fracturing fluid distribution monitoring and leakage diagnosis,artificial fracture initiation and extension monitoring,effectiveness analysis of fracturing-based well completion,and quantitative fracture parameter interpretation. Also,the current technical limitations of the DTS/DAS technology in fracturing monitoring of horizontal wells are pointed out,and the development orientation of the distributed optical fiber monitoring technology for horizontal wells is reviewed. This paper is of great significance for accelerating the application process of the distributed optical fiber monitoring technology and improving the technical level for fracturing monitoring and evaluation of horizontal wells in unconventional oil and gas reservoirs in China.

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    Research Status and Development Proposal of ROP Improvement Technology with Percussion Rock-Breaking Method
    LI Gensheng, MU Zongjie, TIAN Shouceng, HUANG Zhongwei, SUN Zhaowei
    Xinjiang Oil & Gas    2024, 20 (1): 1-12.   DOI: 10.12388/j.issn.1673-2677.2024.01.001
    Abstract170)      PDF (7836KB)(182)       Save

    Enhancing the rate of penetration (ROP) is crucial for optimizing the efficiency of oil and gas development and deep exploration in China and ensuring national energy security. The percussion rock-breaking drilling technology has been applied in oil fields at home and abroad,resulting in significant improvements in ROP. Further research efforts are expected to address the technical challenges of low drilling footage and limited ROP enhancements encountered during deep exploration of hard rock formations with high temperature and pressure. This paper presents and analyzes the practice and development trends of the drill bit percussion rock-breaking drilling technology assisted by axial percussion,torsional percussion,and axial-torsional coupled percussion. It illustrates that the percussion-assisted drill bit rock-breaking mechanism is the core of percussion rock-breaking ROP improvement technology. This paper also reviews the scientific advancements made by domestic and overseas research scholars in physical experiments,theoretical modeling,and numerical simulation of percussion-assisted drill bit rock-breaking. In addition,it offers relevant proposals for the development of percussion rock-breaking ROP improvement technology,i.e. advancing research on material structure optimization design,intelligent control,integration of multiple technologies,and optimization of well applications. This is expected to provide valuable insights for enhancing the drilling efficiency in energy development of our country.

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    Quantitative Characterization of Microscopic Pore Structures for the High-Yielding Shale Gas Reservoir of Longmaxi Formation in Zhaotong Demonstration Zone
    XIE Qingbin, WANG Jia, SONG Shuyu, ZHU Yixiu, WANG Yuhan, ZHANG Jiehui
    Xinjiang Oil & Gas    2021, 17 (3): 7-16.  
    Abstract119)      PDF (18076KB)(171)       Save
    In this study,the high-yielding shale gas reservoir of Longmaxi Formation in Zhaotong Demonstration Zone is addressed. The microscopic pore structures of high-yielding shale gas reservoir were quantitatively characterized by field emission scanning electron microscopy,nitrogen adsorption experiment,X-ray diffraction (XRD),nuclear magnetic resonance experiment,nano-CT scanning technology and Image J image processing software. The study findings show that the rocks of shale gas reservoir mainly consist of greyish black - black shale rich in organic matters and with a porosity greater than 2% and a permeability greater than 0.01 ×10 -3 μm 2. Most of the pores are organic ones with good connectivity,and there are also some intergranular and intragranular pores,as well as a small number of micro-cracks. The pore size is in the range of 5~50 nm. The three types of pore structures are different in pore type,total organic content (TOC) and pore size. Type I pores are mainly organic ones,with high TOC and good reservoir quality. Type II pores have moderate organic content,which are mainly composed of micropores-mesopores provided by organic matters and clay minerals. Type III pores have low organic content,which are mainly composed of some micropores and mesopores provided by clay minerals.
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    Research and Application Progress of Nanofluid for Enhanced Oil Recovery

    LIANG Tuo, YANG Changhua, ZHANG Yanjun, LI Pan, QU Ming, HOU Jirui
    Xinjiang Oil & Gas    2023, 19 (4): 29-41.   DOI: 10.12388/j.issn.1673-2677.2023.04.004
    Abstract172)      PDF (5519KB)(168)       Save

    In view of the limitations of traditional polymer and surfactant solutions in enhancing oil recovery,such as low viscosity retention and large adsorption loss,this paper examines the potential use of nanofluids for enhanced oil recovery and discusses recent research in this field. First,the synthesis of nanomaterials is described,and the methods used for evaluation of the stability of nanofluids in enhanced oil recovery in the field are summarized. Second,six mechanisms by which nanofluids enhance oil recovery are reviewed. These are:reducing interfacial tension,changing wettability,reducing crude viscosity,improving foam stability,structural disjoining pressure,and reducing pressure and increasing injection. Third,the use of nanofluids for enhanced oil recovery in the field is investigated. The “bottleneck” issues that limit the large-scale application of nanofluids in oilfields are also described. For example,there are currently no nanofluid flooding systems available for efficient development of unconventional reservoirs. Furthermore,there has been insufficient theoretical and technical discussion and research. More integrated research is required on inter-related matters such as the development of nanofluids containing two-dimensional nanosheets,determination of the mechanisms for enhanced oil recovery,and field pilot testing of the process. Finally,a direction for the practical introduction and application of nanofluids is proposed.

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    Research Progress on the Mechanisms and Control Methods of Casing Deformation in Shale Gas Horizontal Wells#br#
    YIN Aobo , LI Jun, , LIAN Wei , ZHANG Hui
    Xinjiang Oil & Gas    2025, 21 (1): 50-60.   DOI: 10.12388/j.issn.1673-2677.2025.01.006
    Abstract33)      PDF (3254KB)(129)       Save

    Significant casing deformation (CD) occurs during multi-stage fracturing of shale gas horizontal wells,which reduces the ratio of recovered reservoirs and increases operation costs. Based on a comprehensive review of global research on this issue,a comparative analysis of the current status of casing deformation in shale gas horizontal wells was conducted. With the casing deformation data from Changning-Weiyuan,Luzhou,and Weirong blocks,the distribution patterns of casing deformation in terms of time,space,and morphology were summarized. The influences of engineering factors such as casing and cement sheath types,cementing quality,fracturing and perforation parameters,and thermal stresses,as well as geological factors such as reservoir heterogeneity and reservoir slip,on casing deformation,were analyzed. The analysis results indicate that while engineering factors can increase casing stresses,they are unlikely to cause casing deformation. Among geological factors,reservoir slip induced by natural fractures and faults activated during multi-stage fracturing is the main controlling factor leading to significant casing deformation. To address this issue,various control methods were summarized,including optimizing casing and cement sheath parameters,improving cementing quality,selecting appropriate fracturing and perforation parameters,optimizing wellbore trajectory,and controlling reservoir slip. Additionally,it was proposed to enhance the understanding of formations and improve prediction accuracy of reservoir slip. The research findings provide references for casing integrity design and control during the fracturing process.

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    Xinjiang Oil & Gas    2015, 11 (2): 61-65.  
    Abstract23)      PDF (1673KB)(129)       Save
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    A Global Review of Technical Status and Development Trend of Drilling Fluids for Deep and Ultra-Deep Wells

    LIU Fengbao, SUN Jinsheng, WANG Jianhua
    Xinjiang Oil & Gas    2023, 19 (2): 34-39.   DOI: 10.12388/j.issn.1673-2677.2023.02.004
    Abstract331)      PDF (573KB)(123)       Save

    Drilling fluid is the core technology of deep and ultra-deep drilling and completion,and is one of the key technologies determining the success of a drilling operation. In this paper,the difficulties facing drilling fluids of deep and ultra-deep wells were analyzed,including wellbore instability,failure of drilling fluids at high-temperature and high-salinity conditions,high friction and environmental protection. Moreover,the latest technical progress of water- and oil-based drilling fluids in both China and other countries was reviewed. It was concluded that there are still large technical gaps in temperature and salinity resistance of drilling fluids between domestic drilling fluid systems and foreign advanced technologies,and therefore,it is urgent to strengthen research and development  efforts in terms of failure mechanisms of drilling fluid agents,anti-ultra-high-temperature drilling fluid agents and supporting technologies for special formations.

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    Experimental Research and Application of VHSD Dilatation Stimulation in Shallow Heavy Oil Reservoirs

    ZHANG Liwei
    Xinjiang Oil & Gas    2023, 19 (2): 69-74.   DOI: 10.12388/j.issn.1673-2677.2023.02.009
    Abstract120)      PDF (3036KB)(110)       Save

    In the late development stage of heavy oil reservoirs by steam injection huff and puff,the vertical well + horizontal well pattern steam drive (VHSD) is considered an effective way to sustain the recovery of mature heavy oil blocks. However,due to the interlayer distribution,low formation pressure coefficient,and the presence of steam channels in mature heavy oil blocks,the resultant oil gain of this method is unsatisfactory. The SAGD dilatation stimulation technology for heavy oil recovery can effectively break through the interlayers between injection well and production well and improve the overall production degree of the reservoir. Therefore,it is necessary to perform in-depth investigation of the dilatation technology for heavy oil reservoirs in the context of the VHSD. A one-dimensional core dilatation experiment was carried out,and the results showed no considerable post-dilatation variation of the core porosity and yet,an increase in the effective permeability by about 200 times. Based on large scale three-dimensional physical modeling,a dilatation experiment under the VHSD well pattern mode was carried out. The experiment shows that:(1) When the horizontal well trajectory is parallel to the direction of the maximum principal stress,the dilatation area is larger;(2) The distance of less than 35m between the vertical well and horizontal well is conducive to the formation of the combined dilatation zone;(3) After the high-permeability channels are plugged,an effective dilatation zone can still be formed. The experimental results are applied to the field practice,which shows that the recovered degree of the horizontal section of the production horizontal well is increased by more than 15% and the well production is effectively improved. This research provides effective references for the optimization of key parameters of the dilatation stimulation of heavy oil reservoirs,and is of great significance for the continuous efficient development of mature heavy oil blocks.


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    Progress and Application of the Key Technologies of Deep and Ultra-Deep Well Cementing

    YU Yongjin, XIA Xiujian, WANG Zhiguo, LIAO Fuguo, LIU Binhui, DING Zhiwei,
    Xinjiang Oil & Gas    2023, 19 (2): 24-33.   DOI: 10.12388/j.issn.1673-2677.2023.02.003
    Abstract335)      PDF (1607KB)(107)       Save

    Deep and ultra-deep reservoirs are strategic alternatives for increasing reserves and production of hydrocarbons. Recently,significant progress has been made in deep well cementing,especially for special cementing working fluid systems(such as high temperature-resistant cementing additives,cement slurry tolerant of high temperature and large temperature deferences and ultra-high temperature cement slurry),high temperature-resistant spacer,cementing tools,and cementing technology such as precise managed-pressure cementing,gradual wellhead pressure-holding and prestressed cementing. The cement slurry and cementing technology developed independently in China have been applied to deep well cementing operations in Sichuan,Tarim and Bohai Bay and other basins,and present remarkable performance in the successful cementing operations of Well Pengshen 6,the deepest vertical well in Asia,and Well Hongxing 1,the first well in China featuring 8-section-and-8-completion,and Well Qiantan1,the well with the highest temperature in Dagang Oilfield. Nowadays,the increasing complexity of targets of hydrocarbon exploration and development leads to a series of new challenges for cementing deep and ultra-deep wells. Consequently,it is necessary to strengthen the research on the basic theory,key materials,working fluid system,functional tools and technologies for cementing deep and ultra-deep wells,so as to provide more powerful technical support for deep and ultra-deep oil and gas exploration and development.

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    Optimization of Well Shut-in Time after Fracturing in Jimusar Shale Oil Reservoirs
    ZHANG Yanjun , XU Shucan , LIU Yafei , WANG Xiaoping , GE Hongkui , ZHOU Desheng
    Xinjiang Oil & Gas    2023, 19 (1): 1-7.   DOI: 10.12388/j.issn.1673-2677.2023.01.001
    Abstract373)      PDF (3496KB)(104)       Save

    Well shut-in after fracturing is of great importance for increasing the oil recovery and production of shale oil reservoirs. The key is to determine the shut-in time. At present,there is no systematic and effective method for determining the time of shut-in either in China or across the world. The pressure transmission of the fracture system,the ion diffusion of the produced fluid and the capillary force imbibition are the key problems to be solved for addressing the above challenges. With laboratory experiments and field analysis,a comprehensive determination method for the shut-in time for Jimsar shale oil reservoirs was developed by clarifying the microscopic pore characteristics,wettability,laminae,and imbibition flooding potential of Jimsar shale oil reservoirs and analyzing the existing methods used and characteristics of shut-in time determination. It is concluded that the Jimusar shale oil reservoir provides strong imbibition and diffusion ability,and well shut-in after fracturing contributes to the displacement of oil. The shut-in time can be determined comprehensively in accordance with the required equilibrium time of the wellhead pressure,imbibition,and production fluid salinity. To determine the post-fracturing shut-in time for Jimsar shale oil reservoirs,the synergy of micro-fracture fluid charging and matrix imbibition should be taken into consideration. Specifically,with the second turning point of wellhead pressure decline taken as the lower limit and the turning point for the stable rising of salinity as the upper limit,the optimal shut-in time is determined,considering the imbibition equilibrium. The shut-in time after fracturing for Well Q was optimized based on laboratory experiments and field data. The suggested shut-in time for Well Q is about 55 days. This study provides an important reference for optimizing the shut-in time after fracturing.

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    Experimental on Distributed Photovoltaic Power Plant of Oil Production Platform
    ZHOU Kai, WANG Yang, CHEN Xiangyu, DUAN Shengnan, JIAN Ling, DAI Liya
    Xinjiang Oil & Gas    2022, 18 (2): 1-9.   DOI: 10.12388/j.issn.1673-2677.2022.02.001
    Abstract229)      PDF (2779KB)(101)       Save
    At present,there are 3 types of oil production well sites in Xinjiang Oilfield,which are platform well,single well and cluster well sites. Pumping units and rodless pumps are main energy-consuming equipment,and electric heaters also consume some power. It has become the current trend to replace traditional energy sources with solar energy,because it is clean,harmless,and basically con- sumes no energy. Nevertheless,solar energy also has the disadvantages of poor continuity and stability,low energy density,high cost, large footprint and the necessity for outdoor installation. A distributed solar photovoltaic power generation test and modification was conducted on the oil production platform XY6 in Jimsar of Xinjiang Oilfield. The designed installed capacity is 8 kW. The in-situ gen- erated power is supplied to the power-consuming equipment located at the well site for self use,with the surplus power connected to the grid. In case of power shortage,power will be supplied from the grid. The layout of photovoltaic modules was decided after the optimum dip angle was calculated by designing the modules in series and parallel. In addition,an analysis was conducted by comparing with the data simulated by Pvsyst 7.2 to provide a detailed reference for the overall photovoltaic layout of the platform. By the end of the first quarter of 2022,about 3,000 kW·h power had been generated,and about 20,000 tons of carbon dioxide emissions had been reduced.
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    Research Progress on String Erosion During Massive Sand Fracturing

    ZHANG Sisong, ZENG Dezhi, PAN Yuting, TIAN Gang, YU Huiyong, SHI Shanzhi
    Xinjiang Oil & Gas    2022, 18 (3): 65-72.   DOI: 10.12388/j.issn.1673-2677.2022.03.011
    Abstract88)      PDF (2870KB)(98)       Save
    Massive sand fracturing is a necessary means for the development of unconventional oil and gas resources, as well as an important cause for the failure of downhole pipe strings and tools due to erosion wear. Targeted at this problemthe erosion theories and main research conclusions proposed by foreign scholars based on different materials are reviewed comprehensivelyand the derivative researches into basic erosion theories conducted in China are summarized. Combined with the actual technological conditionsthe main causes of serious erosion of pipe string in the process of sand fracturing are expounded. With respect to the pipe string structures and fracturing tools that are likely to be eroded in the process of massive sand fracturingthe research progress is introduced. Current research difficulties and future research direction of fracturing string erosion are pointed outwhich is of important reference value and engineering significance for protecting the fracturing string against erosion and the wellbore integrityand improving the development effect of unconventional oil and gas resources.
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    The Lost Circulation Mechanism in Formations Prone to Lost Circulation at Misui Block in Changqing Oilfield

    PENG Lei, LUO Jiangwei, ZHAO Hongbo, LE Lu, BIAN Jing, DONG Jingnan
    Xinjiang Oil & Gas    2023, 19 (4): 10-19.   DOI: 10.12388/j.issn.1673-2677.2023.04.002
    Abstract124)      PDF (8824KB)(98)       Save

    Rich in natural gas resources,Misui Block is a key strategic area for accelerating the production of Changqing Oilfield. However,the frequent occurrence of lost circulation in recent years has seriously restricted improvement of cost-efficiency. Therefore,to curb the occurrence of well lost circulation,the lost circulation mechanism in this area has been studied through multi-scale quantitative experiment on rock physical property,microelectrode imaging logging observation and geo-mechanical profile analysis of wells. The results show that the thief zones in Misui Block are mainly in Liujiagou and Shiqianfeng Formations,which have large numbers of micro- and nano-scale fractures. The average calculated dynamic Yang's modulus of the cores from these formations are 17.94 GPa and 8.47 GPa,respectively,and the average dynamic Poisson's ratios are 0.394 and 0.064,respectively. The clay mineral content of Liujiagou Formation is more than 50%,and the brittle mineral content of Shiqianfeng Formation is as high as 72%. The imaging logging map shows that the area contains tensile fractures. The single well geo-mechanical profile reveals a low-pressure area in the thief zone,where the density of drilling fluid is 1.18 g/cm3. Finally,analysis shows that the high contents of clay and brittle minerals in the formation caused both hydration fractures and structural fractures,with low formation pressure causing drilling fluid to flow into natural fractures,eventually resulting in lost circulation. The research results not only reveal the lost circulation mechanism at Misui Block,but also provide technical guidance for selecting plugging methods and reducing well lost circulations at Misui Block.

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    Study and Application of Ultra-High Temperature and Ultra-High Density Cement Slurry System in Deep and Ultra-Deep Wells at Southern Margin of Junggar Basin
    MA Jiang, SU Hongsheng, XU Xinniu, QI Jing, ZHENG Yongsheng, ZHANG Wei, DENG lin, DI xinye, WEI Ruihua
    Xinjiang Oil & Gas    2021, 17 (3): 18-24.  
    Abstract149)      PDF (1593KB)(98)       Save
    Targeted at the geologic characteristics of deep and ultra-deep wells at the southern margin of Xinjiang Oilfield,this paper expounds the main technical difficulties of cementing,especially the technical problems in respect of cement slurry technology,and proposes solutions. On this basis,an ultra-high temperature and ultra-high density cement slurry with the temperature up to 200 ℃,density up to 2.70 g/cm 3,and all performance indicators meeting the requirements of cementing technology was designed. Thus,the technical problems existing with ultra-high density cement slurry when being applied in ultra-high environment,such as poor stability,poor rheological property,slow-to-function compressive strength and poor compatibility,have been solved. This system has been successfully applied to blocks at the southern margin of Xinjiang Oilfield.
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    Study on the Law of Wellbore Alkali-Salt Deposition in Fengcheng Formation  of Mahu Sag#br#
    WU Dingying , PU Di, , ZHENG Miao , YIN Jianyu , LUO Pingya , GUO Yongjun,
    Xinjiang Oil & Gas    2023, 19 (3): 42-48.   DOI: 10.12388/j.issn.1673-2677.2023.03.007
    Abstract89)      PDF (1744KB)(93)       Save

    The post-frac flowback and production of the alkali-salt layers of Fengcheng Formation in Mahu Sag suffer from wellbore salt deposition,but the salt deposition law remains unclear. Therefore,through static and dynamic salt precipitation evaluation experiments,the reservoir conditions affecting the salt precipitation rate and the impacts of flow rate and gas production on wellbore salt deposition in the production process are investigated to clarify the wellbore salt deposition law. The results show that the three typical salts,with their solubility from most to least sensitive to temperature,are sodium carbonate,sodium bicarbonate and sodium chloride. Moreover,the boundary conditions (total salinity and ion composition) and salt crystal types of salt crystal precipitation are defined for composite salt solutions with different compositions. Under the same salinity,the precipitation degrees of composite salts with different compositions are between those of the individual salt,and the priority orders of salt precipitation are sodium bicarbonate,sodium carbonate and sodium chloride,which is consistent with the change of solubility of various salts with temperature. With the increasing flow rate and gas production,the salt deposition first grows and then declines. The salt deposition peaks in the case of the daily liquid production of 40 m3/L and the gas-liquid ratio of 200 m3/L.The study on the salt deposition law in alkali-salt wells helps to set reasonable drainage parameters,delay the salt deposition during flowback,ensure the smooth completion of formation testing after fracturing,and provide a theoretical basis for on-site salt prevention measures in the later production from Fengcheng Formation alkali-salt layers.

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    Xinjiang Oil & Gas    2023, 19 (3): 0-.  
    Abstract91)      PDF (13819KB)(91)       Save
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    Research Progress and Application of Chemical Plugging Materials and Method for Carbon Dioxide Flooding

    ZHU Daoyi, SHI Chenyang, ZHAO Yanlong, CHEN Shengen, ZENG Meiting
    Xinjiang Oil & Gas    2023, 19 (1): 65-72.   DOI: 10.12388/j.issn.1673-2677.2023.01.010
    Abstract206)      PDF (1379KB)(88)       Save

    Carbon Capture,Utilization and Storage (CCUS) technology is an important tool for the energy sector to enable efficient oil and gas production under the dual-carbon goal. Injecting CO2 into oil reservoirs can significantly enhance oil recovery. However,its mobility differs greatly from that of the crude oil,and there’s clear differentiation with oil and water,which results in a limited sweep efficiency of CO2. Therefore,it is urgent to develop efficient CO2 plugging materials and corresponding plugging control technologies to improve reservoir recovery and CO2 storage efficiency. This article explains the characteristics of plugging in the CO2 flooding process and gives an overview of the commonly used CO2 plugging materials and methods. It also describes their applications in oil fields across the world,and their potential for improving CO2 recovery and storage in Xinjiang Oilfield. This study is inspiring for the global research and development of plugging materials in the process of CO2 flooding in oilfields worldwide,and highlights the future direction of CO2 plugging technology in Xinjiang oilfields.

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    Study Progress on Characteristics and Separation of Produced Fluid of CO2 Flooding
    XIONG Xiaoqin, , LIAO Tao , XING Xiaokai , ZHANG Zhunxi , DONG Zhengmiao , BI Yuanjun
    Xinjiang Oil & Gas    2022, 18 (2): 33-39.   DOI: 10.12388/j.issn.1673-2677.2022.02.006
    Abstract167)      PDF (1757KB)(88)       Save
    Gas-liquid separation for the produced fluid of CO2 flooding is an important step in the process of carbon capture,utilization and storage(CCUS),and its efficiency directly affects subsequent crude oil dehydration,associated gas processing,produced water treatment,as well as the selection and operation life of related equipment. Based on the basic composition of the produced fluid,the impact of CO2 on the properties of associated gas,oil and produced water is stated,and the main impacting factors and mechanism of oil foaming and associated gas desorption are analyzed. And then,a solution for efficient separation of gas and liquid is put forward,main methods and application effect of gas-liquid separation are reviewed,and the direction and trend for future study on gas-liquid separation are pointed out. The results show that the relationship between the pressure reduction rate and the foaming characteristics of oil is the key scientific problem to determine the pressure and stage number for gas-liquid separation. Establishing a prediction model for the relationship between oil foam volume and defoaming time under the synergistic effect of multiple factors is helpful to determining the separation time. The organic combination of ultrasonic desorption technology and mechanical separation technology is expected to form a new cost-effective and efficient gas-liquid separation technology
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    Practice and Understanding of Volume Fracturing Technology for Horizontal Wells in Jimsar Shale Oil Reservoir

    XU Jiangwen, WANG Mingxing, WANG Junchao, SUN Haoran, WANG Liang
    Xinjiang Oil & Gas    2024, 20 (3): 23-30.   DOI: 10.12388/j.issn.1673-2677.2024.03.003
    Abstract119)      PDF (790KB)(86)       Save

    Addressing Jimsar shale oil reservoir,this study aims to enhance fracture-controlled reserves by conducting theoretical research and technical practices. Focused on four key aspects—fracture network design,construction,proppant effectiveness,and the enhancement of in-situ oil mobility,three generations of technological advancements have been realized. Fundamental theories regarding the effective propagation of hydraulic fracture in thin interlayers and key technologies such as multi-cluster fracturing within a stage and the use of cost-effective materials have been mastered. An integrated horizontal well volume fracturing technology system centered on fracture-matrix matching,precise stimulation,multi-scale proppant support,and CO2 prepad injection has been developed. The key technical indicators of fracturing have reached the advanced domestic level,supporting the large-scale and efficient development of Jimsar shale oil. In 2023,the oil production of Jimsar shale oil surpassed 60×104 t,with a consecutive annual production increase of 10×104 t in the block for three years. This achievement has provided robust technical support for the establishment of China's first national continental shale oil demonstration zone by 2025 and serves as a reference for optimizing shale oil development technologies in other regions of China.

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    Study and Application of Fracturing Technology for Tight Reservoir in the Southern Margin of Junggar Basin with High Temperature,High Pressure and High Closure Stress
    WEN Xianli, KONG Mingwei, LUO Yao, WANG Jian, ZHAO Chunyan, ZHAI Huaijian, WANG Rong
    Xinjiang Oil & Gas    2021, 17 (4): 15-20.  
    Abstract153)      PDF (1354KB)(85)       Save
    High-quality reservoir is developed in the deep layers of the lower assemblage of the southern margin of Junggar Basin, where embeds tremendous oil and gas resources. However,the reservoir there has a general burial depth greater than 5 700 m,a temperature greater than 130 ℃,a closure stress gradient greater than 0.02 MPa/m,an average porosity less than 10%,an average permeability less than 0.1×10 -3 μm 2 and strong heterogeneity. Due to the poor physical properties,high Young's modulus and high Poisson's ratio of the reservoir,fracturing faces great challenges in respect of fracture initiation,high pump pressure and efficient use,which present higher requirements for wellbore integrity,fracturing materials and technology. Through field study and practices,a fracturing technical system for tight reservoir with high closure stress has been developed,which is centered on the technology to reduce wellhead operating pressure and integrated with proppant combination and optimization technology and treatment parameter optimization technology. Thus,the bottleneck of the fracturing technology for deep reservoir with high temperature and pressure has been broken through. It has been successfully applied in 3 wells since 2020. After fracturing treatment,well-GQ6 has seen significant effect: the maximum daily oil production is 97.97 m 3 and the daily gas production is 2.03×10 4 m. This technical system provides new perspective for deep oil and gas exploration in the southern margin of Junggar Basin.
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    Study on Plugging Technology of Shizigou - Yingzhong Structural Belt in Qinghai Oilfield
    LIU Fenghe , Liu Dezhi, Qiao Shijun , Xing Xing, Lei Biao, Bai Yang
    Xinjiang Oil & Gas    2021, 17 (4): 1-7.  
    Abstract199)      PDF (2795KB)(84)       Save
    Targeting the technical difficulties of well leakage in drilling Shizigou - Yingzhong structural belt of Qinghai Oilfield,geological analysis,operation difficulty summarization and study on plugging measurements are carried out. Taking well SX58 in Shizigou- Yingzhong structural belt as an example,it is found that the low pressure fracture leakage in deep E 3 2 formation is the main factor of well leakage. Based on E 3 2 formation logging data and drilling feedback,combined with 3D printing technology,a simulated fracture model has been designed and developed,and its plugging experiment evaluation method is established. Through laboratory experiments,the plugging material and plugging slurry formula are optimized,which can provide reference and guidance for the follow-up optimal and fast drilling in Qinghai Oilfield.
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    Xinjiang Oil & Gas    2022, 18 (4): 0-0.  
    Abstract115)      PDF (4475KB)(83)       Save
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    Fracture Propagation Law of Hydraulic Fracturing in High-Salinity Reservoir of Fengcheng Formation in Mahu #br#

    PAN Liyan, HAO Lihua, LIU Kaixin, SUN Xize, ZHU Zhenlong, ZHAO Yanxin,
    Xinjiang Oil & Gas    2023, 19 (4): 20-28.   DOI: 10.12388/j.issn.1673-2677.2023.04.003
    Abstract95)      PDF (2886KB)(83)       Save

    The high salt content of Fengcheng Formation in Mahu leads to high operating pressures, difficulty in fracture propagation when penetrating salt layers, and increased difficulty in adding proppant. True triaxial fracturing experiments are carried out on equivalent salt-bearing rock samples prepared according to similarity criteria, and fracture propagation in salt-bearing reservoirs is numerically simulated using the finite element and cohesive element methods. The influence of salt content, viscosity, pump rate, and other factors on fracture propagation is explored. The results show that the fracture opening pressure of salt-bearing reservoirs is greater than that of conventional sandstone reservoirs, and their plasticity is stronger. The existence of pure salt interlayers hinders the longitudinal propagation of fractures. The lower the fluid viscosity , the stronger the dissolution of the salt-bearing reservoir and the lower the operating pressure. The higher the pump rate, the higher the fracturing friction and the operating pressure. In field, high viscosity fluid (120 mPa·s) with clean water and high pump rate (5 m3/min per single cluster) have been adopted to achieve effective penetration into pure salt barriers and form wider fractures. These results have important guiding significance for the stimulation of salt-bearing reservoirs in Mahu area.

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    Study on A Highly Efficient Anti-Swelling and Salt-Resistant Slickwater Fracturing Fluid System
    SUN Xize, XU Chengjun, LUO Teng, GUO Yongjun, REN Hongda, LUO Pingya
    Xinjiang Oil & Gas    2021, 17 (3): 79-83.  
    Abstract105)      PDF (3467KB)(83)       Save
    A study on a highly-efficient anti-swelling and salt-resistant slickwater fracturing fluid system was conducted based on the wastewater from fluid preparation in an oilfield. This study was designed to solve the blockage problem of induced fractures and matrix pores and throats due to the hydration expansion and even rock skeleton collapse after fracturing fluid system contacts a readily loose reservoir with high clay content,strong water sensitivity,and weak cementation. The experimental results show that a highly efficient anti-swelling and salt-resistant slick water fracturing fluid system prepared from 0.05% KY-2 (salt-resistant drag reducer ),0.4% FP-3 (organic amine compound anti-swelling agent),0.1% ZP-2 (cleanup additive),and the said waste water with a TDS of 15 548.96 mg/L has an anti-swelling rate (96.2%) equivalent to 4% KCl,which means a satisfactory anti-swelling performance. After washing with tap-water for 10 times,the anti-swelling rate is still as high as 89.87%,which means a satisfactory long-acting anti-swelling performance. Besides,with a drag reduction rate of 78.45%,this system has a satisfactory drag reduction performance. Field test results have validated that the new system can effectively alleviate the problems of high KCl consumption,high cost,and inability to use mixing-free process in strong water-sensitive reservoirs,as well as the decrease in drag reduction rate due to high TDS.
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    Advances in Study on Rheology Modifier for Water-Based Drilling Fluids
    SUN Jinsheng, , YANG Jie, , RONG Kesheng , WANG Ren, , QU Yuanzhi, , LIU Fan,
    Xinjiang Oil & Gas    2023, 19 (2): 1-16.   DOI: 10.12388/j.issn.1673-2677.2023.02.001
    Abstract134)      PDF (7116KB)(82)       Save

    The global oil and gas exploration is gradually moving from shallow layer to deep layer,conventional hydrocarbon resources to unconventional hydrocarbon resources,medium and high-permeability to low-permeability and low-grade,and shallow seas to deep seas. With the increasing drilling workload,fit-for-purpose drilling fluid technology is needed to provide support for high-performance drilling. High-performance drilling fluids are the key to safe,efficient,economical,and green drilling,and the drilling fluid rheology is the core parameter for evaluating the performance of the drilling fluid system. As an essential treatment agent for building the drilling fluid systems,rheology modifiers can enhance viscosity and shear,improve the yield point-plastic viscosity ratio and optimize shear thinning,so as to control the rheology of drilling fluids. In order to drive the research and development of new rheology modifiers for drilling fluids,this paper investigates and classifies the rheology modifiers for water-based drilling fluids at home and abroad,and summarizes the research results,application,and existing problems of various rheology modifiers. The future direction of rheology modifiers for water-based drilling fluid was also analyzed to facilitate the technical improvement of water-based drilling fluids.

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    Current Status and Suggestions for Drilling Technology of CNPC Continental Shale Oil Reservoirs

    Xinjiang Oil & Gas    2024, 20 (3): 1-14.   DOI: 10.12388/j.issn.1673-2677.2024.03.001
    Abstract191)      PDF (2045KB)(79)       Save

    Shale oil with medium to high maturity is the key field for China's shale oil strategic breakthrough,and strengthening the exploration and development of continental shale oil is an important way to ensure the security of national energy supply. The technical progress of shale oil drilling in Ordos,Junggar and Songliao Basins by China National Petroleum Corporation (CNPC) was introduced in detail,including large platform factory-like well placement,horizontal well casing program optimization,"one-run drilling" in separate well sections,high-performance drilling fluids for horizontal wells,integrated geological steering and other key technologies. By benchmarking against advanced shale oil drilling technologies in North America,the gap and development trend of shale oil drilling in China were analyzed in terms of well placement and wellbore configuration,geological-engineering integration and steering technology,supporting technology for accelerating rates of penetration (ROP),drilling fluid and cementing supporting technology. Development suggestions,such as continuously promoting large platform factory-like operations,optimizing wellbore configurations,integrating ROP acceleration technologies,strengthening research on geological-engineering integration,and accelerating the research and development of new-generation steering tools,were proposed in order to achieve the goals of ROP acceleration,cost reduction,and efficiency improvement in continental shale oil drilling,and moreover,the engineering goals of the shale oil revolution.

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    Xinjiang Oil & Gas    2014, 10 (4): 24-27.  
    Abstract15)      PDF (2166KB)(79)       Save
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    ZHANG Jingchun, , REN Hongda , YU Tianxi , YIN Jianyu , ZHOU Jian , ZHOU Hongtao
    Xinjiang Oil & Gas    2023, 19 (1): 27-34.   DOI: 10.12388/j.issn.1673-2677.2023.01.005
    Abstract138)      PDF (547KB)(76)       Save

    Proppant is the key material for propping hydraulic fracturing,and its performance has a significant impact on the effect of fracturing stimulation,so the research on fracturing proppants has received extensive attention. This paper summarizes the research and application of fracturing proppants and related technologies,including conventional proppants such as quartz sand,ceramic proppant,and coated proppant,as well as new types of proppant and related technologies such as self-suspension proppant,gas-suspension proppant,and in-situ generated proppant reported in recent years,totaling 10 categories. Last but not least,the paper looks into the future development directions of proppants and related technologies to provide reference for researchers of proppants and further accelerate the development of proppant technology.

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    Application of Running/Pulling Cable Type ESPCP in Shale Oil Production
    CHU Haoyuan, ZHANG Liping, YAO Jinhang, ZHANG Jianwen, ZHANG Hui, LEI Derong, JIANG Li
    Xinjiang Oil & Gas    2021, 17 (4): 92-94.  
    Abstract103)      PDF (1545KB)(75)       Save

    Electric submersible progressive cavity pumps(ESPCP)were used in the preliminary test of Jimsar shale oil well area in Xinjiang Oilfield. The rodless pump lift technology has solved the problems of rod breaking and eccentric wear existing with rod pumps,and is well applicable to heavy oil wells with sand production. With this technology,however,it is difficult to bind cable and tubing together,and cable is readily to be damaged in the process of tripping string. Nonmetallic cable conduit and ESPCP can effectively solve the problems of difficult binding operation and cable damage,but they are difficult to run in,pull out and fish when the oil viscosity is too high. Therefore,a running/pulling cable type ESPCP lift technology was tested. During production,cable is run into well through tubing,and then connected with downhole cable connector. When the pump needs to be lifted,cable is pulled out of tubing.In this way,the tripping in and ou toperations of cable is realized by running in and pulling out through tubing.

    This paper introduces the running/pulling cable type ESPCP lift system,and analyzes its field application effect. At present,this system is used in 23 wells in the shale oil well area of Xinjiang Oilfield,and the success rate of cable running,pulling and connecting is 100%. Due to its advantages of intelligent control,energyconservation,less consumption,safety and environment-friendliness,the application of this system is worth expanding.

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    Numerical Simulation of the Pressure Law of Energy Charging and Permeability Enhancement in Low Permeability Reservoirs

    ZHU Zheng, DANG Hailong, CUI Pengxing, DANG Kaiyan, BAI Pu, ZHAO Yining
    Xinjiang Oil & Gas    2023, 19 (4): 56-62.   DOI: 10.12388/j.issn.1673-2677.2023.04.007
    Abstract103)      PDF (6406KB)(75)       Save

    A number of problems have been experienced with water injection in Yanchang Oilfield,such as high-pressure injection failure,poor flooding effect,and rapid increase of water cut during injection. An innovative method for energy charging and permeability enhancement is proposed to address these issues. Numerical reservoir simulation is used to study the evolution of fractures,matrix pressure,and bottom hole pressure propagation during injection and well shut in. The influence of injection volume on fracturing effect is also analyzed. It is found that,during the injection stage,rapid injection of fluid increases the pressure in the fracture,with the injected fluid passing through the main fracture to the tips of the fractures. The pressure increase mainly occurs around the fracture itself,with little change in the matrix pressure. In shut in stage,as shut in time increases,the matrix pressure in the fracture and near-fracture zone initially decreases rapidly and then tends to become stable after a certain time. If the distance from the fracture is more than 30 m,the matrix pressure first increases and then decreases with the increase of shut in time. The bottom hole pressure also declines rapidly in the early stage of shut in with the rate of decline slowing in the later stage. The greater the injection volume,the higher the formation energy. Analysis of the effect of energy charging and permeability enhancement in field applications for low permeability reservoirs shows remarkable increases in pressure and oil production. This provides a valuable reference for the development of energy charging and permeability enhancement in similar reservoirs.

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    Xinjiang Oil & Gas    2014, 10 (3): 45-51.  
    Abstract22)      PDF (1256KB)(75)       Save
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    Analysis of the Effects for Reamer Size under Different Operation Conditions:a Case Study of Well H101 in the Southern Margin of Junggar Basin

    GAN Quan, ZHANG Maolin, ZHANG Chen, WEI Qiang, LI Bingqing, ZHANG Dong
    Xinjiang Oil & Gas    2023, 19 (3): 10-20.   DOI: 10.12388/j.issn.1673-2677.2023.03.002
    Abstract114)      PDF (5579KB)(74)       Save

    The determination of the reamer size(the desirable reamed borehole size) is a global challenge for research on reaming in drilling. To ensure smooth drilling and cementing of reamed borehole sections,an in-depth case study of Well H101 drilled in the southern margin of Junggar Basin was performed to identify the affecting patterns of the reamed borehole size on drilling,tripping and cementing operations. The requirements for the reamer size were analyzed from perspectives of the drilling tool bending deformation,pump rate optimization,BHA vibration,swab and surge pressure during tripping and fluid density window,surge pressure of running liners,equivalent circulating density(ECD) during cementing,and wellbore integrity incorporating wellbore curvature,and the impacts of changes in casing sizes on cementing of the reamed borehole section were investigated. Finally,the above analyses were combined with a mathematical statistical approach to comprehensively determine the reamer size. The determined reamer size was applied to Well H101 and analogous wells in the southern margin of Junggar Basin,which were all found with smooth drilling operations after reaming,and moreover,Well H101 delivered a daily penetration of 101 m for the reamed borehole section. The presented method and strategy for the reamer size optimization incorporate more factors and are more reliable. They provide important references for determining the reamer size of to-be-reamed wells. 

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    New Energy Power System of PetroChina
    ZHANG Yanju, SHI Bingbo, ZHAO Jiaoyan, ZHANG Jiankang
    Xinjiang Oil & Gas    2022, 18 (2): 21-25.   DOI: 10.12388/j.issn.1673-2677.2022.02.004
    Abstract210)      PDF (483KB)(74)       Save
    PetroChina Exploration and Development Research Institute has designed and implemented a new energy power system for PetroChina by reviewing and investigating in details the current business on new energy power based on the development status and trend of new energy projects in oil and gas fields in recent years. This system adopts a framework based on data middle platform,inte- grates big data,artificial intelligence technology and diversified data analysis algorithms,and establishes different data analysis models according to business scenarios for data analysis and governance,so as to realize intelligent data analysis. A data model based on the bottom layer of cloud platform has been constructed. Business intelligence(BI)report display tool has been used to realize the visual- ized analysis of new energy power data. On the basis of data lake architecture and BI report display,the new energy power system of PetroChina has been designed,developed and implemented. Through the construction of this system,PetroChina's demand for applying IT technology to its new energy power is met,the ideas and methods for new energy power development and data analysis are enriched, and the efficiency of data acquisition and use is improved,which provides a basis for the production management and decision-making analysis of new energy power in a better way.
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    Design Optimization of Downhole Throttling for Gas Wells in Xinjiang Oilfield and Its Application 
    DU Junjun , CHI Ming , Xieraili·MAIMAITI , WANG Gang , WANG Wenwen , LIANG Haibo
    Xinjiang Oil & Gas    2022, 18 (4): 84-88.   DOI: 10.12388/j.issn.1673-2677.2022.04.015
    Abstract201)      PDF (751KB)(72)       Save
    In order to meet the requirements of gathering and transportation pressure,and prevent wellhead hydrate freeze bloking,design optimization has been made for the downhole throttling process of high-pressure and medium/low-pressure gathering and transportation regarding well selection conditions,gas nozzle diameter,setting depth,and other key technical parameters based on the technological principle of downhole throttling,and wellbore temperature and pressure profiles have been simulated. The results show that the downhole throttling process can meet the pressure requirements of high-pressure and medium/low-pressure gathering and transportation,and effectively solve the problem of wellhead hydrate freeze bloking. 
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    Xinjiang Oil & Gas    2013, 9 (3): 1-4.  
    Abstract11)      PDF (2137KB)(69)       Save
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    Overview of Oilfield Microbial Technology Research and Application
    REN Hongda, ZHAO Yongchang, MA Zehua, LUO Teng, SUN Xize
    Xinjiang Oil & Gas    2022, 18 (1): 86-89.   DOI: 10.12388/j.issn.1673-2677.2022.01.014
    Abstract139)      PDF (458KB)(68)       Save

    The development of most oilfields in China is challenged by such problems as low recovery factor,serious wax formation in wellbore and pipelinesand insufficient gel breaking during stimulation for low-temperature reservoirs. Microbes are widely used in oilfield development due to the properties of their metabolic products. This paper makes an overview of the research of microbial technology and its application in oilfields in respect of enhanced oil recovery EOR),wax removal and controland fracturing fluid gel breaking. The paper explains the mechanism of microbial technology in three areassummarizes the advantages and disadvantages of the application of microbial technology in oilfieldsand makes an outlook for the research focus of microbial technology in future oilfield development.

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    A Machine Learning-Based Bridging Particle Size Recommendation Method for Lost Circulation Control

    LIU Fan, LIU Yushuang, ZHANG Zhen, LI Yongjian, LIU Ce, MA Zhihu,
    Xinjiang Oil & Gas    2024, 20 (1): 13-20.   DOI: 10.12388/j.issn.1673-2677.2024.01.002
    Abstract93)      PDF (3565KB)(68)       Save

    Lost circulation is a key technical challenge in oil and gas exploration,and bridge plugging is the most commonly used method for lost circulation control. As an important parameter,the size of bridging particles directly affects the plugging. At present,the size selection mainly relies on experience,lacking a scientific and effective method. In light of this,this paper investigates a particle size recommendation method for lost circulation control based on machine learning algorithms. The basic data used for this method are well-logging,mud logging,and lost circulation control data from 126 completed wells in Kuqa piedmont area of Tarim Basin. The input layer adopts 23 main parameters screened based on the Pearson algorithm,and the output layer is in 4 bridging particle size ranges of 0-750 μm,750-1 500 μm,1 500-4 000 μm and>4 000 μm. 10 commonly used machine learning algorithms are trained and tested to determine the accuracy of three types of datasets:well logging data,mud logging data,and combination of the former two types. It is found that the scores of each algorithm for the well logging + mud logging dataset are generally higher than those for the well logging and mud logging datasets. For the combined dataset,the support vector machine and extremely randomized trees algorithms have the highest F1 scores of above 0.9. The bridging particle size recommendation model based on the support vector machine and extremely randomized trees algorithms is validated twice on a well in Kuqa piedmont area. The predicted results of bridging particle size of the two algorithm models are consistent with the actual bridging effect in the field. This method exhibits good application prospects in the scientific optimization of bridging particle size.

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