大庆高160-侧平38井设计与轨道控制

高160-侧平38井是大庆油田第一口接近短半径的侧钻水平井,目的是开发厚油层上部未动用的剩余油。段铣套管长度井深977~995.20m。第一次由977.60m侧钻至1032.04m,由于测量仪器故障使井底井斜角落后10°,被迫用水泥封固。因对井眼扩大率估计不足,水泥只封到1011m。第二次用2.75°弯螺杆从1007m悬空侧钻,至井深1028.53m井底井斜角落后11°,原因是配合接头扣未上紧,使全力增斜变为稳斜扭方位或降斜,被迫再次用水泥封固。第三次由990.78m悬空侧钻(水泥面991.12m),至1102.88m进靶,入靶点井斜87.2°,垂深1061.24m、靶前距70.12m。水平钻至1182.88m,最大井科90.3°,井眼轨道波动幅度为靶线上0.61m,靶线下0.29m。文中介绍了前期准备工作、工程设计和井眼轨道控制。

DESIGN AND TRAJECTORY CONTROL OF GAO160-8 SIDETRACKING HORIZONTAL WELL IN DAQING QILFIELD

Well Gao160-Ceping 38 was the first short-radius sidetracking horizontal well in Daqing oilfield. It was drilled to develop the remaining oil which has not been touched before at the top of thick oil reservoir. The length of section milled casing was 977~995. 2 m. For the first time, the well was sidetracked from 977. 60m to 1032. 04m. The deviation angle at bottomhole lagged 10° because of the measuring instrument failure. So the well had to be cemented. The cement only returned to the depth of 1011m because the hole enlargement rate was not enough to be estirnated. For the second time, the well was sidetracked from 1007m with 2. 75° bent screw rod. The deviation angle at the bottom hole lagged 11° at the depth of 1028. 53m. The reason for this was that the adapter was not made up, this made angle building change into angle holding or angle dropping. The well had to be cemented again. For the third time, the well was sidetracked from 990. 78m(the cement top 991. 12m).The deviation angle at the target point was 87. 2°, the vertical depth was 1061. 24m. The horizontal displacement was 1182. 88m, the maximum deviation angle was 90. 3°. The wave amplitude of the well trajectory was 0. 61m on the line,0. 26m under the line. This paper introduced preliminary preparation, engineering design and well trajectory cotrol.