地质导向技术在煤层气鱼骨状水平井关键技术环节的应用探讨

Application of Geologic Steering Technology in the Key Technical Sections of Fish-bone CBM Horizontal Well

鱼骨状多分支水平井为煤层气开采中的常见井型,与其它井型相比,具有最大限度地增加泄油面积、充分利用上部主井眼、节约钻井费用等显著优点,提高产量与采收率,已经成为高效开发油气藏的理想井型。针对此类井型现场施工难点,渤钻二录地质导向人员,结合近年来在煤层气水平井施工经验,在鱼骨状水平井分支轨迹如何合理展布及主支优化、主支侧钻、筛管下入等关键控制技术上进行改进,总结出一套有利于鱼骨状水平井施工的控制措施。

Fish-bone multi-lateral horizontal well is a typical well type for CBM development. Compared with other well types, it is featured with the remarkable advantages such as maximally increasing the drainage area, making full use of the upper bottom of the main borehole, saving the expense of It could also improve the gas production and the drainage drilling. rate, which makes it a ideal well type for effec- tive oil and gas recovery. To solve the construction difficulties of such wells, the paper combines the con- struction experience of CBM horizontal well in recent years, improve the key control technologies, inclu- ding the reasonable distribution of the branches for the fish-bone horizontal well, the optimizing of the main borehole, the sidetracking of the boreholes, the running of screen pipe. It also summarizes the con- trol measures which will benefit the construction of the fish-bone horizontal well.