Improvement and application of drilling fluid technology for gas exploration wells in Yanchi block

Currently, the exploration and development scope of Changqing oilfield has gradually developed to edge blocks deep systems, typically Yanchi block. However, in construction process, there are some problems such as poor well wall stability, frequent leakage prominent collapse contradiction, which seriously restricts increase drilling speed. In this paper, measures structure optimization, system formulation separate management leakage, refined performance control, pressure-bearing plugging were taken by a combination with situation 2021 so improve speed reduce complexity downhole failures.