“一趟钻”技术在煤层气L型水平井的应用

Application of single trip drilling technology in “L” type coalbed methane horizontal wells

摘要:

“一趟钻”技术是实现安全快速钻完井、降本增效的重要途径。柳林煤层气钻井中采用“一趟钻”技术，钻井效率和经济效益明显提高，对已完工的7口L型水平井分析研究表明：合理配置钻探设备、选用适合该地层特征的PDC钻头、实时优化钻井液体系是实现“一趟钻”的基本保证，技术先进、性能良好、持续稳定的定向仪器、优化井眼轨迹及精准地质导向是关键技术，长寿命螺杆、近钻头旋转导向等新技术的应用，必将助力“一趟钻”技术在该地区的普遍实施。

Abstract:

One trip drilling technology is an important way to achieve safe and fast drilling and completion， reduce cost and increase efficiency. One trip drilling technology was adopted in Liulin CBM drilling， and drilling efficiency and economic benefits were significantly improved. Analysis of 7 completed “L” type horizontal wells showed that： proper selection of drilling equipment and the PDC bit suitable for stratigraphic characteristics， and real time optimization of the drilling fluid system provided basic guarantee to single trip operation； and the MWD survey tool of advanced technology， good performance and reliability， optimization of well trajectory， and accurate geo-steering were the key technology. Application of new technology such as long life mud motors， near-bit rotary steering systems， will certainly help with extensive use of the single trip technology in the region.