HH12P103水平井优快钻井技术

Optimized and Fast Drilling Technology of Horizontal Well HH12P103

摘要:

HH12P103井是中石化华北分公司在鄂尔多斯盆地天环坳陷南端部署的一口评价井，井型为水平井。该井钻遇地层复杂，在环河有盐层，安定组和直罗组掉块严重容易卡钻，延安组还有煤层，水平段钻遇泥岩夹层，容易剥落；钻井过程中出现坍塌、漏失、井斜。针对这些地质复杂情况和钻井难点，在施工过程中优化钻具组合，使用单弯螺杆和MWD组合防斜，水平段带扶正器；工艺措施上尽量勤调整，但是每次少量调整，保证了井眼轨迹圆滑性；同时，施工过程中及时调整好泥浆性能，不间断使用三级固控设备，使用150目的振动筛，及时清除泥浆中的有害固相，保证井眼清洁，降低了摩阻和扭矩，从而提高了机械钻速。

Abstract:

Located in south Tianhuan depression in Ordos Basin, HH12P103 horizontal well is an evaluation well belonging to China Petrochemical Group North China Branch. The drilled formation is complicated with salt layer in Huanhe; sticking is easy to occur in Anding and Zhiluo group due to collapse; there is coal bed in Yan'an group; and horizontal section is in clay intercalation where collapse is easy to occur. Leakage, collapse and deviation happened during the drilling process. According to these complicated geological situation and drilling difficulties, drill string assembly was optimized, combined application of single bent-housing motor and MWD was used for anti-deviation and centralizer was used in horizontal section. Process measures were adjusted as frequently as possible with small amount for each time to ensure the smooth well trajectory. Meanwhile, mud properties were optimized timely during the drilling operation, the three-level solids control equipment was used continually and the shale shaker with 150 screens was used to clear away the harmful solids in the mud timely to ensure the hole cleaning, drag and torque reducing to improve the ROP.