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The friction torque of drill string in horizontal section is a key factor restricting the drilling extension limit. Practice has proved that the hydraulic oscillator can effectively reduce the friction between the drill string and the borehole wall, increase the rate of penetration and improve the drilling efficiency. However, the mechanical extension limit of hydraulic oscillators with different drag reduction parameters has not been fully revealed. In this paper, the mechanical model of drill string with hydraulic oscillator is established considering the ground and downhole constraints, and the finite difference method is used to solve the model. Based on the propagation distance model and the optimal installation position model, considering the constraints of drill string fatigue failure and hydraulic loss, the main control factors affecting drag reduction efficiency are optimized by orthogonal test design. Then, the mechanical extension limit model is established by introducing the drag reduction effect of hydraulic oscillator, and the main controlling factors affecting the extension limit are determined. Taking the mechanical extension limit of the horizontal section as the objective function, the optimal controlling factor value is recommended. Finally, the above model is calculated and analyzed by a horizontal well. The results show that the hydraulic oscillator can significantly improve the transmission of axial force and increase the drag reduction efficiency. Compared with the model without cuttings, the mechanical extension limit of the horizontal section considering cuttings is reduced. The amplitude and the number of hydraulic oscillators are the main factors affecting the extension limit. In the case study, it is recommended that the hydraulic oscillator is installed at 204 m from the bit. The optimal drilling parameters are: drilling fluid density of 1500 kg/m3, amplitude of 45 kN, WOB of 30 kN, and ROP of 10 m/h. The extension limit is increased to 6878 m, and the extension efficiency is 9.5%. This study can provide important guidance for risk control and optimization design of horizontal well operation.

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Analysis of Mechanical Extension Limit with Hydraulic Oscillators in Sliding Drilling

  • 会议论文

  • 发表日期：

    2025年

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  • Xiaolei Shi,
  • Wenjun Huang,
  • Deli Gao,
  • Qianying Ren

摘要

The friction torque of drill string in horizontal section is a key factor restricting the drilling extension limit. Practice has proved that the hydraulic oscillator can effectively reduce the friction between the drill string and the borehole wall, increase the rate of penetration and improve the drilling efficiency. However, the mechanical extension limit of hydraulic oscillators with different drag reduction parameters has not been fully revealed. In this paper, the mechanical model of drill string with hydraulic oscillator is established considering the ground and downhole constraints, and the finite difference method is used to solve the model. Based on the propagation distance model and the optimal installation position model, considering the constraints of drill string fatigue failure and hydraulic loss, the main control factors affecting drag reduction efficiency are optimized by orthogonal test design. Then, the mechanical extension limit model is established by introducing the drag reduction effect of hydraulic oscillator, and the main controlling factors affecting the extension limit are determined. Taking the mechanical extension limit of the horizontal section as the objective function, the optimal controlling factor value is recommended. Finally, the above model is calculated and analyzed by a horizontal well. The results show that the hydraulic oscillator can significantly improve the transmission of axial force and increase the drag reduction efficiency. Compared with the model without cuttings, the mechanical extension limit of the horizontal section considering cuttings is reduced. The amplitude and the number of hydraulic oscillators are the main factors affecting the extension limit. In the case study, it is recommended that the hydraulic oscillator is installed at 204 m from the bit. The optimal drilling parameters are: drilling fluid density of 1500 kg/m3, amplitude of 45 kN, WOB of 30 kN, and ROP of 10 m/h. The extension limit is increased to 6878 m, and the extension efficiency is 9.5%. This study can provide important guidance for risk control and optimization design of horizontal well operation.