侧钻双分支水平井井眼轨迹控制

WELL PATH CONTROL TECHNIQUE OF SIDETRACK DRILLING DUAL BRANCH HORIZONTAL WELL

静 31-59井是 1口侧钻水平井,完钻井深 2425m,水平段垂深 2131m,悬挂器喇叭口位置 2126. 22m。为充分挖潜老区产量,在静 31-59井开窗侧钻双分支水平井。通过精心设计、组织与施工,静 31-59FP井仅用 15d纯钻时间成功钻完 2个分支井段,累计裸眼长度 768m。该井由辽河油田工程院自行设计、施工,无经验可借鉴。静 17块地层坚硬,钻进时加压困难,目的层薄,倾角变化明显,施工时轨迹控制难度很大。通过转盘钻进与滑动钻进相结合,控制钻进参数、调整轨迹,防止井眼轨迹忽起忽落,为完井创造了良好的条件,该井是国内第 1口侧钻双分支水平井,为其它油田的侧钻双分支水平井成功实施提供了丰富的经验。

Jing31-59 is a side-tracked horizontal well, the well depth is 2425 m, and horizontal interval is 2131 m. The position of bell mouth of the hanger is 2126.22 m. Sidetrack drilling dual branch horizontal well in Jing31-59 for making full use of old field. Through accurate design, organization and operation, the net drilling time of the dual horizontal interval in Jing31-59FP is only 15 day, and the accumulated open section length is 768 m. The well is designed and operated by the engineering research institute of Liaohe oil filed, and no experience that can use for reference. The formation of Jing17 block is firm hard, and it is hard to set weight on bit while drilling. The target zone is thin, and the change of the dip angle is significant. It is very difficult to control the well path. By combined with rotary drilling and slide drilling, we regulated the well track by control the drilling parameters. As far as possible prevent the well track rise or drop suddenly, which create better condition for completion. This well is the first sidetrack drilling dual branch horizontal well, and presents abundant experience for sidetrack drilling dual branch horizontal well of other oil field.