The Technical Research Of Faster Drilling Of Cluster Wells In Su-Lige Gas Field

The reservoir developed by cluster wells has a wide range of advantages and promotion prospects compared with vertical wells. Firstly, reducing the levy by land costs, construction costs before drilling, relocation and transportation costs are the most significant benefits. Secondly, in terms of the protection of the ecological environment, it can reduce the destruction of grassland, woodland and soil and water conservation. This paper aiming the problems occuring in the process of drilling directional wells has brought forward a theory of raising the height of kickoff point and optimized the profile of "vertical-slowly buildup-hold angle-slowly drop angle-slope steady" and "vertical-slowly buildup-slope steady-buildup-hold angle" based on the optimization of the number of wells in cluster wells group. According to the rock drillability and the damage mechanism analysis of direction well PDC bit, in the aspects of the acron shape、the resisting hardness interlance、the resisting curl arranging coggings、the cogging angle along with the direction ability and so on, the PDC bit of direction well were designed and optimized; the application technique of PDC bit was researched, and the make up of string "quadruple" structure of the PDC bit、the single bent stud、the pony DC and the stabilizer was developed, This drilling rig composition content straight hole deviation control、directional incline、compound adjustment and hold angle path control require, hydraulics and drilling parameter were optimized. Drilling technologies research and field test for cluster wells were used in Sulige gas field, in Sul4、Tao12、sundog and su36experimental area, grand total cluster wells were348, average drill cycle shorten from36days in2008to19.6days in2011, average ROP was14.7m/h..Drilling technique of cluster well group promoted widely in Su lige gas field. which has become the major development mode of Su lige gas field.