延川南区块煤层气高效开发钻完井工艺技术探讨

延川南区块位于鄂尔多斯盆地东缘南部,煤层气勘探已取得工业突破,目前正进行开发准备工作。通过前期勘探阶段实践,该区块存在的主要问题是单井产量较低、钻井效率有待提高。结合地层特点,对储层改造、钻井井型、完井方式、井身结构、钻井方式、储层保护工艺技术、装备配套及水平井的应用等关键工艺技术进行了探讨,提出了在储层改造方面以水力压裂改造为主、在钻井井型方面以定向井井型为主、在钻井工艺方面以空气旋冲钻井工艺技术为主、在完井工艺方面以下入Φ139.7 mm套管固井为主、在储层保护方面以低固相、低渗透钻井液体系为主、在装备配套方面以采用车载全液压钻机为主等结论,同时对需进一步研究和探讨的钻完井工艺技术方法提出了建议。

Discussion about the efficient development of CBM in Yanchuannan block and drilling&completion technology

Yanchuannan block lies in the southern part of eastern fringe of Ordos basin.Industrial breakthrough has been made in its exploration phase,and the preparation work for development is under way.The earlier exploration practices show that the major problem existing in this block is the lower individual well production and drilling efficiency.Combined with the formation features,this paper made a research on the following key technology: reservoir reconstruction,well type,completion method,well structure,dril...