延页平3井大偏移距水平井减阻降摩技术研究

Research on Friction Drag Reducing Technology of Long Horizontal Shift Well—YYP3

摘要:

减阻降摩技术是大偏移距水平井成功完钻的关键技术之一。通过对井眼轨迹参数优化，优选出具有低摩阻系数的井眼轨迹；建立摩阻/扭矩分析模型，分析了钻井液粘滞力和管柱屈曲对摩阻的影响，推导出摩阻/扭矩计算公式，提出了摩阻/扭矩预测的方法；采用低摩阻系数的油基钻井液，将摩阻系数降低了65.2%；采用漂浮下套管技术，极大地降低了下套管过程中的摩阻。延页平3井中成功应用上述技术，准确地预测了钻井过程的摩阻，解决了大偏移距水平井钻井过程中的托压问题，实现了套管一次性下放到位。延页平3井的应用表明：上述技术可以在大偏移距水平井中推广使用，并对国内其他地区大偏移距水平井施工有一定借鉴意义。

Abstract:

Friction drag reduction is one of the key technologies in long horizontal shift well drilling. By optimizing the parameters of well track, a well track with low frictional coefficient is obtained. By the establishment of friction/torque analysis model, the influence of viscous force of drilling fluid and buckling of drill string on frictional drag was analyzed and friction/torque calculating formula was derived and a method to predict drag/torque was also presented. By using low friction coefficient oil-based drilling fluid, the friction coefficient was decreased by 65.2%. With casing floating technology, friction in casing running was significantly reduced. The above technologies were applied in well—YYP3, the friction in drilling process was accurately predicted to solve backing pressure in long horizontal shift well drilling and realize casing running in place in one time. The application in well-YYP3 show that these above technologies can be widely used in long horizontal shift well and can provide reference in long horizontal shift well drilling in other parts of China.