Application and analysis of sidetracking technology in Su 59-13-XX well
The design depth of the Su59-13-XX well is 4 968 m,with a vertical depth of 3 675 m and a horizontal section of 1 001 m.During the construction process,downhole complex situation occurred when the second-spud drilling reached 3 790 m,requiring sidetracking.After considering factors such as wellbore trajectory,formation lithology,and cement plug,sidetracking started at 3 490 m.A bit of short gauge,high side force was chosen in combination with the Lilin 7LZ165×1.75° screw for micro build-up azimuth-drop sidetracking.The sidetracking took 13 hours,with the sidetracked section from 3 490 to 3 496.5 m,advancing 6.5 m.The sidetracking was successful and the sidetrack trajectory was smooth,creating good conditions for subsequent construction.This paper briefly introduces the basic situation of Su 59-13-XX well,the complex well conditions encountered in the project and the solution.Then,the paper detailly discusses the design of the sidetracking trajectory,selection technology of PDC drill bit and BHA,difficulties of sidetracking operation,preparation before sidetracking,and specific sidetracking construction process.
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