大位移井减阻工具性能试验与数值模拟

为解决大位移井、长水平井等在钻进过程中摩阻大、托压等问题,设计了新型大位移井减阻工具。该工具利用水力脉冲压力波动,使钻柱产生轴向振动,有效减小钻柱与井壁间的摩阻,改善钻压传递,延伸定向井、大位移井、水平井等井眼长度。通过工具性能试验和数值模拟相结合的方法,验证了减阻工具设计的可行性和振动的稳定性。分析了叶轮的叶片数、承压板的通孔面积、钻井液排量等参数对减阻工具脉动压力频率和幅值、压降、轴向振动位移等的影响规律。研究结果可为大位移井降摩减阻技术研究、减阻工具参数优选等提供参考。

Performance Test and Numerical Simulation of Drag Reduction Tool for Extended Reach Wells

In order to solve the problems of high friction between the drill string and wellbore during the drilling process of extended reach and long horizontal wells, a new drag reduction tool for extended reach wells was designed. The tool utilizes hydraulic pulse pressure fluctuations to generate axial vibration of the drill string, reduces friction between the drill string and the wellbore, improves WOB transfer, and thus extends the length of directional, extended reach, and the horizontal sections. Through tool performance test and numerical simulation, the design feasibility and vibration stability of the drag reduction tool were verified, and the influence of factors such as impeller blades number, through-hole area of the pressure bearing plate, and drilling fluid flow rate on the pressure fluctuation amplitude, frequency, pressure drop and axial vibration of the tool were analyzed. The results can provide references for the research of friction reduction technology during drilling extended reach wells and the optimization of the drag reduction tool’s parameters.