Practice of Gas Release and Density Reduction with MPD in Penglai Gas Zone
Due to the deep burial of reservoirs in the Penglai gas area,it is highly prone to the complex situation of"coexistence of lost circulation and overflow".Under the conditions of conventional drilling technology,the wellbore pressure fluctuates greatly,the processing time is long,which can easily cause secondary complexity dur-ing the processing,so the fine pressure-controlled drilling technology is now mostly used to deal with the problems of multiple pressure systems and narrow safety density windows in the same well section.Therefore,precise MPD is used to deal with the problems of multiple pressure systems and narrow safety density windows in the same well section.The MPD is used to control the bottom hole pressure to be slightly lower than the formation pressure,so that the formation fluid can enter the wellbore in a controlled manner and release,so that the safe density window can be rebuilt.The actual application effect of this technology in the block is compared with conventional drilling technology,which not only reduces complex processing time,but also effectively reduces the well control risk dur-ing complex processing,verifies the feasibility of this technology,and significantly improves the efficiency and safety of gas release and density reduction during drilling.It is recommended to further promote the application of this technology in the Penglai gas area in the future.
Penglai gas groupprecise MPDgas release with MPDdensity reduction