Key Technologies of Factory Drilling and Completion in Su 53 Block

The Sulige gas field belongs to the largest tight sandstone gas reservoir in China, and Su 53 is the only block in which horizontal wells have been implemented in integrated development. In order to improve the development efficiency at a low cost, and following the previous practice and experience of advanced factory operations experience both domestically and abroad, suitable factory drilling and completion techniques for Sulige gas field have been determined by regional geological research, which optimize the design scheme and the construction management. The key technologies include geosteering for horizontal wells, drilling and reservoir stimulation. Geosteering technology can better guide horizontal wells accurately into the target zones with high efficiency by improving the geological model and adjusting the well trajectory. Drilling technology includes optimizing the casing program and well trajectory, optimizing PDC bits and drilling fluid system as well as designing the drilling rig move on a rail system. Reservoir stimulation technique integrates the volume fracturing into synchronous fracturing to improve producing reserves according to the regional geological characteristics and drilling parameters. Through the implementation of factory drilling and completion in Su 53 Block, the drilling cycle of the average single well was shortened for 15.98 days, the drilling payzone rate raised 4.9% points, and the gas production increased 4 900 cubic meters per day respectively compared with traditional horizontal wells. The factory drilling and completion techniques could provide a new paradigm for domestic unconventional gas reservoir development with horizontal wells.