关键词:  低效井, 治理, 侧钻, 打捞, 水平井

Abstract:  Studies and practices show that by sidetracking in the same layer the casings in low-efficiency wells, low production wells and shut down wells can be made full use, the well construction period reduced, costs saved, and the residual oil recovery effects improved, production recovered out of the low yield wells. There are problems like hard to fish out sand screen pipe out of the horizontal open hole, sidetracking plug quality not ensured and shale drilling risks in horizontal section when drilling at Well AX at Chengbei oilfield, so research is made on the key techniques regards same layer sidetracking. Same layer sidetracking operation in AX well is completed successfully at last, costs saved by 69% , and oil production been 6. 8 times of that before. This technology provides an effective method to increase potential reserves at offshore oil fields and extend the production life of old oil fields, worth a further popular application.

Key words:  , inefficient wells, overhaul, sidetracking, fishing, horizontal well