Current Status and Application of Offshore Managed Pressure Drilling Technology
With the advancement of exploration technology and continuous drilling into deep formations,the problems,such as coexistence of kick and lost circulation,narrow pressure windows and abnormal high pressure,are still grim,and frequently occur blowout,overflow,stuck,collapse and other complex conditions,which have become challenges and urgent solutions to achieve safe and efficient drilling.In view of the above-mentioned problems,considering the differences between domestic offshore drilling and onshore drilling in terms of geolog-ical characteristics,wellbore structure,operation mode,etc.,based on the structure and process principle of onshore managed pressure drilling equipment,a miniaturized,modular and efficient managed pressure drilling equipment and supporting processes suitable for offshore operations have been formed,and especially the RCD system struc-ture,chock manifold structure,back-pressure compensation process of automatic chock manifold and other aspects greatly optimized and upgraded.At present,the offshore managed pressure drilling has been widely applied,and it has become one of the effective means to solve the problem of kick and lost circulation in drilling shallow large wellbore and fractured reservoirs.On site applications have shown that managed pressure drilling technology not only helps to reduce downhole complexity and drilling costs,but also provides reliable guarantees for well control safety during drilling and completion operations.It has broad application prospects in drilling high pressure,frac-tured and loss-prone reservoirs,which helps to improve exploration and development efficiency.
fractured stratacoexistence of kick and lost circulationnarrow pressure windowsabnormal high pressureoffshore managed pressure drilling
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