塔河油田沙3区块水平井钻井技术

Horizontal Well Techniques in Sha-3 Block of Tahe Oilfield

通过对塔河油田沙3区块已完成的5口水平井的总结分析,认为该区块水平井钻井过程中存在地层可钻性差、地温梯度高、造斜点浅、PDC钻头复合钻进时增斜规律性不强等技术难题,从井身结构优化、钻井液优选、应用"PDC钻头+螺杆"钻进等方面介绍了5口水平井钻井所采取的主要技术措施,并给出了相应的钻具组合、钻井液维护处理及工程技术措施,指出应加强钻具造斜性能的统计分析及PDC钻头的应用,进一步优化井身剖面,优化技术措施,以提高机械钻速,缩短钻井周期,从而提高该区块水平井钻井的综合经济效益。

Based on the analysis of five horizontal wells completed in Sha-3 block of Tahe Oiltield, technical challenges were identified, including poor drillability, high geothermal gradient, shallow kick off point, weak build up rate while using PDC bit and mud motor. The main techniques used in these 5 horizontal wells were introduced, including casing schematics design, drilling fluid selection, compounding drilling using PDC bit and positive displacement mud motor （PDM）. The corresponding bottom hole as sembly （BHA）, drilling fluid preparation, and engineering measures were introduced in this paper. Finally, this paper suggests, in order to improve the comprehensive economic benefits, we should further optimize the well schematics design, improve technical measures, increase rate of penetration, and reduce drilling cycle.