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Optimizing Pendulum Bottom-Hole Assembly Based on New Straightening Capability Evaluation Index

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
  • Published:
Chemistry and Technology of Fuels and Oils Aims and scope

Borehole deviation is an important issue of vertical drilling, and the pendulum bottom-hole assembly (BHA) with one stabilizer is often applied to straighten it. The traditional design and application method mainly takes the bit side force (pendulum force) as the evaluation index of straightening capability. The positive influence of bit side force is often over-emphasized while the negative influences of the other factors are often neglected. To improve the design and application method of pendulum BHA, the equilibrium tendency method to predict the build-up rate (BUR) of a steerable BHA is introduced to directly predict the inclination change rate of pendulum BHA for the first time, and then taking it as new evaluation index of straightening capability to optimize the pendulum BHA. The main influencing factors and laws of straightening capability of pendulum BHAs in three boreholes are analyzed and compared, and new understandings have been obtained for the first time. The research results have shown that predicting the inclination change rate by the equilibrium tendency method and taking it as the evaluation index of straightening capability can improve the design and application of pendulum BHA. The straightening capability of pendulum BHA significantly changes with stabilizer position, weight-on-bit (WOB), bit anisotropy index and borehole diameter. Compared to the pendulum BHA (optimal stabilizer position is about 20 m, recommended specific WOB is below 0.35 kN/mm) in 215.9 mm borehole, pendulum BHA in larger boreholes can properly increase the stabilizer position and specific WOB, but pendulum BHA in smaller boreholes must properly decrease the stabilizer position and specific WOB. It is suggested not to apply the pendulum BHA in small borehole, because the allowable WOB for deviation control is often too small to meet fast drilling requirement.

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Acknowledgements

This paper was supported by Major Project of National Science and Technology “Development of Rotary Steerable Drilling System (2016ZX05022-002)”, and Sinopec Major Project “Research on Key Engineering Technology of Unused Reserve Development in Tahe Oilfield (P21063-3)”. The authors thank all participants.

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Authors and Affiliations

  1. SINOPEC Northwest Company of China Petroleum and Chemical Corporation, Wulumuqi, China

    Zongqi Chen, Weihuang Sun & Guangqiao Li

  2. Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs, CNPC, Wulumuqi, China

    Zongqi Chen, Weihuang Sun & Guangqiao Li

  3. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China

    Yucai Shi

  4. Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China), Ministry of Education, Qingdao, China

    Yucai Shi

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  1. Zongqi Chen
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  2. Weihuang Sun
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Correspondence to Yucai Shi.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 96–103 March– April, 2023.

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Chen, Z., Sun, W., Li, G. et al. Optimizing Pendulum Bottom-Hole Assembly Based on New Straightening Capability Evaluation Index. Chem Technol Fuels Oils 59, 351–361 (2023). https://doi.org/10.1007/s10553-023-01535-3

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