扭力冲击器对钻柱黏滑振动的影响分析

Influence of torsional impactor on stick?鄄slip vibration of drillstring

毛良杰 马茂原 刘立鹏 张伟 陈春宇

西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500 中国石油川庆钻探工程有限公司钻采工程技术研究院，陕西
西安 710018 中国石油长庆油田分公司第三采油厂，甘肃 银川 750006 中国石油长庆油田分公司油气工艺研究院，陕西 西安 710018

扭力冲击器可抑制钻柱黏滑振动并提高机械钻速，被广泛应用于深井、超深井钻井中。其工作参数作为影响扭力冲击器应用效果的直接因素，相关研究还很不充分。为了评价扭力冲击器对钻柱黏滑振动的抑制效果，文中建立了考虑扭力冲击器高频扭矩的钻柱扭转振动模型，编制了相关计算程序，并采用四阶￣五阶Runge￣Kutta算法进行求解，讨论了扭力冲击器主要工作参数对钻柱黏滑振动的影响。研究结果表明：扭力冲击器可以有效缩短黏滑周期，以抑制钻柱黏滑振动和增加其机械钻速；当扭转冲击载荷较低时，增大扭转冲击载荷可以缩短黏滑周期甚至消除钻柱黏滑振动，但是当黏滑现象消失后，继续增大扭转冲击载荷对钻柱扭转振动的影响较小；增大冲击频率可以减弱钻柱黏滑振动，并提高钻柱转动时的稳定性。研究结果可为扭力冲击器工作参数的选择提供参考。

Torsional impactor is widely used in deep and ultra-deep wells because it can suppress stick-slip vibration of drillstring and increase rate of penetration (ROP). As the direct factor affecting application effect of torsional impactor, existing related studies on it is still not sufficient. In order to evaluate the suppressing effect of torsional impactor on stick-slip vibration of drillstring, a dynamic model of torsional vibration of drillstring considering the high frequency torque provided by torsional impactor is established to compile the calculation program, and solved by the fourth-fifth Runge-Kutta method. The influence of main working parameters of torsional impactor on stick-slip vibration of drillstring is analyzed. The results show that the torsion impactor can effectively reduce the stick-slip period of drillstring, thereby suppressing the stick-slip vibration and increasing the ROP. When the torsional impact load is lower, increasing the torsional impact load can reduce the stick-slip period and even eliminate the stick-slip vibration of drillstring. However, when the stick-slip disappears, continue to increase the torsional impact load has small effect on the torsional vibration. Increasing the impact frequency can suppress the stick-slip vibration and improve the stability of the drillstring during rotation. The research results can provide reference significance for the selection of working parameters of torsional impactor.

10.6056/dkyqt202204018