Differential Sticking Prediction During Liner Running and Drilling Operations Case Studies

摘要

Differential sticking can be detected early by tracking the static friction effects.The study presented here focuses on differential sticking prediction both during liner running(can also be applied in casing running)and drilling operations.The monitoring system is based on tracking the static friction trend and comparing it to dynamic friction trends during casing/liner running and drilling operations.Any trend change that leads to the gradual separation between static and dynamic friction could be interpreted as a differential sticking tendency.The differential pressure and permeable formations analysis should be incorporated to avoid a false alarm in detecting differential sticking tendency.The basis of static-dynamic friction monitoring are hookload and torque data comparison during tripping and rotating operations.During tripping in string,the slack-off weight is monitored,during tripping out string,the pick-up weight is monitored,and while drilling,the torque is monitored(Tab.1)[1,2].Actual case studies were carried out in this study and the hookload and torque data(static-dynamic)monitoring systems were applied.The results show that the static-dynamic hookload and torque monitoring during casing/liner running and drilling operations can be applied as an early detection of differential sticking tendency.