大庆油田B1-5-P57三维欠位移水平井轨道设计及应用

The Trajectory-design and Application of 3D Under-displacement Horizontal Well B1-5-P57 in Daqing Oilfield

B1-5-P57井是位于大庆长垣萨尔图构造中部的一口三维水平井,方案给出的靶前位移仅为183.86m,按常规设计,会使得轨迹造斜率大,井斜和方位变化急剧,导致钻井施工及后续作业难度大,该井目的层为葡Ⅰ2砂体顶部未水淹的侧积体,纵向上层薄,横向展布变化大,因此水平段不能变动。为满足油藏地质开发需要,提出了三维"反勾"型欠位移轨道设计方法,优化了该井的井身结构及井眼轨迹剖面,并给出了设计和现场应用实例。

The well of B1--5--P57 is a 3D horizontat weft wmcn is located at the center of Saertu structure of Daqing placanticline. The target displacement of the scheme is only 183.86m. According to conventional design, the track will be of greater build-up rate, dramatically changed inclination and azimuth, which makes the construction and the follow-up work he diffi cult. The target stratum of the well is P I 2 side sedimentary sand body which top do not be flooded with water. The stratum is thin in vertical and has a large change in lateral, so the hori- zontal segment can not be changed. To meet reservoir develop- ment needs, the ＂reverse-hook＂ type trajectory-design of 3D un- der-displacement horizontal well is suggested, the well profile and the well track are optimized , the design example and field application are given.