Application of horizontal well sidetrack drilling and completion in slim hole in QHD32-6 oilfield

Due to the particularity of offshore oil development, there are limited number of slots in oil platforms meanwhile the cost of the new platform and plug-in slots is too high, therefore, using inefficient wells and shut down well slots for sidetracking is a good choice. Some of production wells in QHD32-6F platform use the Φ177.8 mm production casing, with the use of workover rigs, Φ152.4 mm hole is sidetracked in the Φ177.8 mm production casing and the average length of open hole section is 1 032 m. Horizontal well sidetrack drilling and completion in slim hole can short construction period, decrease cost, extend the life of old oilfield and maintain economic development of old fields.