Study and Measures for the Complex Condition during Drilling on Coal Beds in the X Structure of East China Sea

Sticking occurred frequently during tripping while drilling into the coal beds in the X structure of East China Sea. Through statistic analysis on the basis of rock mechanics and chemical tests, the reasons for the complex condition during well drilling were analyzed deeply. Technical measures to solve the complex conditions have been put forward, which provide the basis for the safe and efficient drilling work in the future.