Discussion on western Sichuan deep horizontal well structure

Deep resources is rich in Western Sichuan, but the geological conditions is complex with the rock super dense,high pressure, large output and so on. Conventional vertical wells and directional drilling wells have to encountered drilling problems as long life cycle, mechanical drilling speed slow, low rates of crack. Aimed at Xujiahe drilling difficulty, combined with current tools technology level, started with the hydraulic parameter optimization, leakage plugging techniques, supporting tools, and casing wear to put forward deep wells structure design program in western Sichuan,namely: conventional drill bit - Casing series, technical casing down to the horizontal well as to reduce four open construction difficulty and the horizontal well construction using 215. 9 mm drill bit. At the same time this program brought forward the discoveries of Xiusan and Xiuer simultaneously for the first time, reduced the difficulty of Xiuer drilling through drilling fluid technology to solve the problemof technical sprayed through the fluid leakage. The casing design is conducive to improve the success rate of drilling of deep horizontal wells, but also bring a new way of thinking for the design of the body structure of the West Sichuan deep vertical wells and directional wells.