关键词: 页岩气, 轨迹优化, 防碰, 钻井提速, 长宁

Abstract: There are many difficulties during the shale gas development and drilling process in Changning block, such as serious nature deviation angle of surface formation, poor drillability, small deviation in anticollision and angle maintaining interval, collapse in the angle descending interval, long drilling period, high drilling cost, and so on. Based on the disadvantages analysis of the previous design plan, the well distribution plan, well trajectory design and drilling technology is further optimized for the cluster wells, and a new trajectory optimization scheme is proposed. The technology scheme has achieved good results through field test. The drilling speed has been improved obviously and the drilling period has been reduced significally, which provide technical support for the shale gas development in Changning block.

Key words: Shale gas, Trajectory optimization, Anticollision, Increase of drilling speed, Changning block