Application of well control technology on adjustment wells in matured areas of Shengli Oilfield

Formation pressure disturbance is very common in matured areas of Shengli Oilfield due to long period of waterflooding development, and the issue of different pressure systems in the same openhole segment is often met during adjusted well drilling. And Loss of circulation and well kick often happen. all of the above issues increase the difficulty of well control. Formation pressure characteristics, effluent water spillover and circulation loss during adjustment well drilling are analyzed, and the reasons leading to abnormal pressure are discussed. Reasons that cause formation water production are explored in detail, and corresponding measures are proposed, which are pressure relief by stopping water injection in injectors, drilling while spilling, well killing and casing isolation. The applications prove the feasibility of the used well control method.