玛湖油田玛18井区“工厂化”水平井钻井技术

Factorization Drilling Technology of the Horizontal Well in the Ma18 Well Block of the Mahu Oilfield

玛湖油田玛18井区致密油气水平井钻井存在钻井速度低、钻井周期长的问题,为此,在分析该井区地层情况和钻井技术难点的基础上,进行了'工厂化'水平井钻井关键技术研究,包括成熟钻头序列优选、直井段采用'MWD+螺杆+PDC钻头'钻进、造斜段和水平段使用'旋转导向工具+PDC钻头'钻进、应用XZ高性能水基钻井液等,形成了玛18井区'工厂化'水平井钻井技术,多口井的现场应用结果表明,单井完井周期明显缩短.其中,MaHW6234和MaHW6235平台水平井单井完井周期缩短至86.0 d;MaHW6203井钻井周期缩短至78.8 d,完钻井深6130.00 m,创玛湖油田水平井最深纪录.玛湖油田玛18井区'工厂化'水平井钻井技术为高效开发玛湖油田三叠系百口泉组致密油气藏提供了技术支持.

In order to improve penetration rate of the Ma18 Well Block in the Mahu Oilfield,the factory drilling plan of horizontal well was proposed based on the analysis of the geological stratum conditions and technical challenges in well drilling in the field.Different techniques were applied to create the factory drilling plan for the horizontal well in the Ma18 Well Block including mature drill bit sequence optimization,the use of MWD+screw+PDC bit in drilling through vertical sections,the application of rotary steering tool+PDC bit in the build-up/horizontal sections,and the XZ high-performance water-based drilling fluid,etc.The application of this technology achieved good results.The average single well completion period was significantly reduced resulting in 86.0 d for platform MaHW6234 and MaHW6235.It was reduced to 78.8 d for Well MaHW6203 with total depth to 6 130.00 m,setting the depth record of horizontal wells in the Mahu Oilfield.The factory drilling technology of horizontal wells in the Ma18 Well Block of the Mahu Oilfield has provided technical support for the efficient development of the Triassic Baikouquan Formation reservoir.