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<p>As the degree of oil and gas extraction increases, the stepped horizontal well, as an important well type for extracting thin interbedded and fault-block oil and gas reservoirs, has been applied more and more. However, existing research has not fully revealed the influence of wellbore trajectory parameters of stepped horizontal wells on the frictional torque of the entire drill string. To address this, this paper establishes a large span stepped horizontal well drill string dynamic finite element model that takes into account multiple factors such as drilling fluid damping, drill string-wall contact, and drill bit-rock interactions. The study investigates the influence of four wellbore trajectory parameters on the frictional torque of the entire drill string, including the dogleg severity of the increased inclination section, the deviation angle of horizontal Sect.&#xa0;<InternalRef RefID="Sec1">1</InternalRef>, the drop of the horizontal section, and the stable inclination angle of the stepped stable inclination section. The research results indicate that: the frictional torque of the entire drill string is positively correlated with the dogleg of the increased inclination section. By fitting the maximum stress on the drill string under different dogleg values, it is found that the dogleg in the increased inclination section should not exceed 17.92°/30m. The frictional torque of the entire drill string is also positively correlated with the deviation angle of horizontal Sect.&#xa0;<InternalRef RefID="Sec1">1</InternalRef>. When the deviation angle of horizontal Sect.&#xa0; <InternalRef RefID="Sec1">1</InternalRef> reaches 90°, the frictional torque increases sharply, and the ROP decreases significantly. It is recommended to use 86° ~ 88°. By fitting the frictional torque of the entire drill string under different drops of the horizontal section, a prediction formula for the frictional torque based on the drop of the horizontal section is obtained. Compared to the other three wellbore trajectory parameters, the stable inclination angle in the stepped stable inclination section has less impact on the frictional torque of the entire drill string. This study provides more accurate theoretical guidance for the optimization and design of stepped horizontal wells.</p>

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Study on the influence of wellbore trajectory parameters on drill string friction in stepped horizontal well

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Changshuai Shi,
  • Yuanhao Zhao,
  • Xiaohua Zhu,
  • Feilong Cheng,
  • Hanhao Wang

摘要

As the degree of oil and gas extraction increases, the stepped horizontal well, as an important well type for extracting thin interbedded and fault-block oil and gas reservoirs, has been applied more and more. However, existing research has not fully revealed the influence of wellbore trajectory parameters of stepped horizontal wells on the frictional torque of the entire drill string. To address this, this paper establishes a large span stepped horizontal well drill string dynamic finite element model that takes into account multiple factors such as drilling fluid damping, drill string-wall contact, and drill bit-rock interactions. The study investigates the influence of four wellbore trajectory parameters on the frictional torque of the entire drill string, including the dogleg severity of the increased inclination section, the deviation angle of horizontal Sect. 1, the drop of the horizontal section, and the stable inclination angle of the stepped stable inclination section. The research results indicate that: the frictional torque of the entire drill string is positively correlated with the dogleg of the increased inclination section. By fitting the maximum stress on the drill string under different dogleg values, it is found that the dogleg in the increased inclination section should not exceed 17.92°/30m. The frictional torque of the entire drill string is also positively correlated with the deviation angle of horizontal Sect. 1. When the deviation angle of horizontal Sect.  1 reaches 90°, the frictional torque increases sharply, and the ROP decreases significantly. It is recommended to use 86° ~ 88°. By fitting the frictional torque of the entire drill string under different drops of the horizontal section, a prediction formula for the frictional torque based on the drop of the horizontal section is obtained. Compared to the other three wellbore trajectory parameters, the stable inclination angle in the stepped stable inclination section has less impact on the frictional torque of the entire drill string. This study provides more accurate theoretical guidance for the optimization and design of stepped horizontal wells.