侧钻水平井初始井眼条件对起始段轨迹的影响分析

ANALYSING THE INFLUENCE PRODUCED BY INITIAL HOLE FACTORS ON THE PRI MARY SECTION TRAJECTORY IN RE-ENTRY HORIZONTAL WELLS

侧钻水平井轨迹起始段工艺技术 ,是侧钻水平井钻井工艺的关键技术。为了考虑侧钻点位置及老井的初始井斜、方位对侧钻水平井起始段的影响 ,需要对侧钻水平井进行三维轨迹设计考虑。文章运用空间斜平面法分析了对侧钻水平井起始段有重要影响的主要初始井眼条件 ,包括侧钻点 (地层因素 )、侧钻点初始井斜角、侧钻点初始方位角等对起始段轨迹的影响。为满足油藏工程、钻井工程对侧钻水平井方位、水平位移的要求 ,达到井眼轨迹平滑 ,顺利实现钻井、完井工艺 。

The technology of hole trajectory primary sect io n is the key of drilling in re entry horizontal wells.In order to research the influences produced by sidetracking position,the primary hole deviation and azim uth of used wells on the primary section of the re entry horizontal wells,it is necessary to consider the 3 D trajectory design of the re entry horizontal wel ls.The principal initial hole factors influencing primary section trajectory,suc h as sidetracking position (formation factors),primary deviating angle and prima ry azimuth of the sidetracking position are analysed by spatial plane tilted me thod.A guarantee is provided for the azimuth and deviation of the re entry hori zontal wells of oil reservoir engineering and drilling engineering to make the h ole trajectory smooth,achieve the drilling and well completion techniques withou t a hitch and raise the target rate.