The anti-collision and barrier-bypassing technology of horizontal well drilling in Changqing Maling Oilield

Many horizontal wells deployed by the Changqing Oilield in old oilields, the construction is inluenced by the ter- rain conditions and restrictions around adjacent wells. During the process of drilling, anti-collision problems occur prominently, so the method of effective anti-collision determines the success of horizontal well construction. Maling Oilield has been explored by Changq- ing Oilield Company since 1970’s. Nanping 1 well is a typical horizontal well of anti-collision and barrier bypassing of the oilield. To guarantee the quality and safety of construction, the anti-collision information is analyzed, and the dificulties and focus of the anti-col- lision and barrier bypassing is found out. Before construction, the anti-collision technology and the related information estimation is studied, as a result, the optimal program of anti-collision and barrier bypassing is selected. According to the program, appropriate bits, drilling equipment and tools for drilling operation are selected, so that the trajectory is effectively controlled. The use of the anti-colli- sion technology not only makes the hole drilled very successfully around the barrier, but also makes the well trajectory smooth, so as to come into the window precisely, and ensure the smooth construction of the follow-up operation, and then improve the speed of drilling.