韩城矿区煤层气L型水平井套管钻井技术

Casing drilling for L-shaped CBM horizontal wells in Hancheng mining area

涂志民 张亮 吕娜 李鹏 孟思源 衣丽伟

TU Zhimin ZHANG Liang LYU Na LI Peng MENG Siyuan YI Liwei

中石油煤层气有限责任公司

Petrochina Coalbed Methane Company Limited, Changji 831119, Xinjiang, China

地质条件与工程技术匹配程度决定了煤层气开发效果,为进一步摸索适合韩城矿区煤储层特点的开发技术,不断改善该区煤层气开发效果，在总结该区丛式井组射孔压裂及多分支水平井技术开发效果基础上，结合该区煤储层低孔、低渗及低压的特点，应用L型水平井套管钻井技术。该技术三开采用套管钻进，完钻后不进行固井作业，直接射孔完井。结果表明该类开发技术具有一般水平井开发技术的优点，与多分支水平井相比能够保持井壁的稳定性，同时避免固井作业及压裂改造带来的不利影响，产气效果明显趋好。

How geological conditions match engineering technologies determines the coalbed methane (CBM) development. To further explore a development technology applicable to the characteristics of coal reservoirs in the Hancheng mining area and constantly improve the CBM development effect in the area, the development effect of cluster well group perforation and fracturing and multilateral drilling technologies applied in this area was analyzed and then an L-shaped horizontal well casing drilling technology was used according to the low-porosity, low-permeability and low-pressure characteristics of coal reservoirs in this area. With this technology, a third-sized hole of a well can be drilled with casing and no cementing job but only perforation is required after the hole is drilled to total depth (TD). The results show that this type of technology with the advantages of common horizontal well development technologies can maintain borehole wall stability, avoid the unfavorable impact of cementing and fracturing and deliver better gas production than multilateral drilling.

10.13639/j.odpt.2019.04.004