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Study and Test of Individualized Bit for the Horizontal Sections of Glutenite in Xinjiang Oilfield

WANG Xindong, WU Zhi, YAO Changshun, LI Yingxin, ZHANG Wutao, XIE Zhengsen

Xinjiang Oil & Gas 2022, 18 (1): 54-58. DOI: 10.12388/j.issn.1673-2677.2022.01.009

Abstract （192）

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Mahu tight conglomerate oil field in Junggar Basin is a key area for Xinjiang oilfield to increase production. In the horizontal sections of glutenite in Aihu well area of Xinjiang Oilfield with strong heterogeneity and poor drillability， a drill bit has only a short footage and a high decommissioning rate， giving rise to long-time drilling. In view of the long drilling period there， formation lithology， drill bit usage and drilling parameters of the drilled wells were analyzed and studied， and a new type of individualized PDC bit was designed and developed. Packaged with optimized drilling parameters and drill string assembly， a technical scheme based on the new bit to improve the drilling speed was formulated. After the application of this new bit to the drilling in glutenite horizontal sections， mechanical penetration rate increased by 137.46% and footage increased by 32.7~153.3%， compared with the average parameters per bit in this block. Field application shows that the new individualized PDC bit specially designed is highly targeted， and the packaged technical scheme to increase drilling speed is reasonable. With this scheme， mechanical penetration rate and footage for one run of bit were significantly improved， and drilling period and cost were reduced， laying a sound foundation for the development and application of individualized bits similar to this application.

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Research and Practice of Horizontal Wellbore Cleaning Technology

LI Zhenchuan , YAO Changshun , HU Kaili , LAN Zuquan

Xinjiang Oil & Gas 2022, 18 (1): 48-53. DOI: 10.12388/j.issn.1673-2677.2022.01.008

Abstract （252）

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In recent years， the large-scale development of unconventional oil and gas resources in China has led to a sharp increase in the number of horizontal wells. Due to the lack of scientific and systematic understanding on horizontal well bore cleaning， drilling process in horizontal section often appears stuck， completion ahead of schedule， disability of running casing to the predetermined well depth. In addition， poor wellbore cleaning can also cause very high implicit costs， including ROP controlling， increasing time consumption of reaming， circulation， and tripping. In this paper， by clarifying the mechanism of cutting migration in different sections of horizontal wells， analyzing the key elements of wellbore cleaning and proposing a method to evaluate wellbore cleaning by monitoring actual drilling friction， a set of efficient horizontal wellbore cleaning technology has been formed. Field practice in Mahu and Jimsar shale oil has verified the technical theory based on field data， which can guarantee the cleanness of horizontal section under the conditions of existing domestic equipments and instruments， and greatly ruduce inefficient production time consumption such as mud circulation and wiper tripping to increase speed and efficiency.

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