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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

Abstract （88）

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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 problem， the erosion theories and main research conclusions proposed by foreign scholars based on different materials are reviewed comprehensively， and the derivative researches into basic erosion theories conducted in China are summarized. Combined with the actual technological conditions， the 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 fracturing， the research progress is introduced. Current research difficulties and future research direction of fracturing string erosion are pointed out， which is of important reference value and engineering significance for protecting the fracturing string against erosion and the wellbore integrity， and improving the development effect of unconventional oil and gas resources.

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Productivity Model of Fractured Horizontal Wells in Shale Oil Reservoirs with Bedding Fractures Considered

CHEN Xi, LIU Ruining, XIE Bobo, PAN Yuting, HE Xiaodong

Xinjiang Oil & Gas 2022, 18 (1): 73-79. DOI: 10.12388/j.issn.1673-2677.2022.01.012

Abstract （133）

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Horizontal well fracturing is a key technolohy for the commercial exploitation of shale oil reservoirs， and the productivity after fracturing has always been the study focus of many scholars. A traditional shale oil productivity model ignores the influence of bedding fractures formed during fracturing on productivity. In response to this problem， the related theory of embedded discrete fracture model is introduced to establish a three-dimensional horizontal well productivity model for shale oil reservoirs with bedding fractures considered. The model is discretized based on finite-difference， and the pressure distribution and typical productivity curves in reservoir matrix and fractures are obtained by MATLAB programming. The influence of permeability and fracture density on shale oil productivity is analyzed. Studies show that productivity increases with the increase in the permeabilities of bedding fractures， and with the increase in the density of bedding fractures. When the permeability of bedding fractures is relatively high and developed， great error will be resulted in if no bedding fractures are included in the productivity model. The model in this paper is of important practical significance for accurately predicting the productivity of shale oil reservoirs after fracturing.

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