DP6水平井φ311.15mm井眼侧钻技术探

Wupu Drilling Company of North China Petroleum Bureau, SINOPEC

摘要:

DP6井是华北分公司在大牛地气田布置的一口长水平段水平井。该井设计造斜点井深2510.00 m，在φ311.15 mm井眼内以平均4.85°/30 m的增斜率增斜钻进至A靶点，增斜钻进至井深3033.05 m时钻穿目的层至下部煤层。为了实现钻井目标，避免煤层坍塌的风险，决定采取上调靶点垂深、填井侧钻的补救处理措施。文章结合老井眼实钻轨迹情况，对侧钻工艺、侧钻点的选择、侧钻井眼轨迹调整、高井斜侧钻技术难点及采取的相应技术措施等进行了分析，对侧钻钻具组合、侧钻施工情况等进行了介绍。该井的成功侧钻为以后同类大井眼侧钻提供了现场经验。

Abstract:

DP6 well is a long horizontal well in Daniudi gas field, its designed kickoff point was at 2510.00m depth, drilling with average building up rate of 4.85°/30m to target A in φ311.15mm borehole, and penetrating the target strata at 3033.05m depth with increasing angle to underlie coal seam. Upregulating the vertical depth of target point and sidetracking were adopted to avoid coal seam collapse. The paper analyzed sidetracking technology, selection of sidetracking point, trajectory adjusting for sidetracking, difficulties in large hole deviation sidetrack drilling and the relative technical measures; and introduced the drill assembly and construction of sidetracking.