川南下寒武统筇竹寺组井研—犍为地区页岩气安全优快钻井技术及应用

Technology and Application of Safe and Efficient Shale Gas Drilling in the Qiongzhusi Formation of Jingyan-Qianwei Area, Southern Sichuan

罗成波 周兴付 欧彪 刘伟 张生军 张玉胜 王治国

LUOChengbo ZHOUXingfu OUBiao LIUWei ZHANGShengjun ZHANGYusheng WANGZhiguo

中国石化西南油气分公司石油工程技术研究院, 四川 德阳 618000 中国石化西南油气分公司非常规勘探开发管理部, 重庆 永川 402160 中国石化西南油气分公司工程技术管理部, 四川 成都 610041

Petroleum Engineering Technology Research Institute, Southwest Petroleum Branch, SINOPEC, Deyang, Sichuan 618000, China Unconventional Exploration and Development Management Department, Southwest Petroleum Branch, SINOPEC, Yongchuan, Chongqing 402160, China Engineering Technology Management Department, Southwest Petroleum Branch, SINOPEC, Chengdu, Sichuan 610041, China

井研—犍为地区发育拉伸、挤压、走滑等多种构造，整体裂缝发育，西南部多方向断层交错，断缝复杂。前期部署的探井钻井过程主要面临漏层漏点多、直井段防斜打快难度大、井眼轨迹控制难度大、机械钻速慢等问题。为了安全高效勘探开发该区块页岩气，研发形成了以差异化三开制井身结构优化、地质工程一体化轨道设计避断溶体、控压降密度技术控溢漏复杂及多级高效堵漏技术为核心的安全钻井技术，以防塌钻井液体系、钻头钻具钻进参数一体化及四位一体地质导向为关键的优快钻井技术。技术集成应用9口井，优质储层平均钻遇率100%，平均钻速由1.9 m/h上升到8.6 m/h，钻井周期由233 d缩短到72 d。实践表明，形成的安全优快钻井技术不仅为安全高效勘探开发提供了技术支撑，而且为增储保矿，持续上产稳产提供了技术保障。

The Jingyan-Qianwei Area has developed various structures such as stretching, compression, and strike slip, with overall crack development. The southwest of the areas is characterized by multiple intersecting faults and complex fractures. The drilling process of exploratory wells deployed in the early stage mainly faces the following challenges: There are many leakage points in the formation, difficulties in quick inclination prevention in straight sections and in well trajectory controling; the mechanical drilling speed is slow. In order to safely and efficiently explore and develop shale gas in this block, a safety drilling technology has been developed with the optimization of differentiated three opening wellbore structure, integrated geological engineering track design to avoid fracture solution, pressure drop density control technology to control complex overflow and leakage, and multi-stage high-efficiency plugging technology as the core. The key to this technology is the anti collapse drilling fluid system, integrated drilling parameters of drill bits and drilling tools, and four in one geological guidance. Technology integration is applied to 9 wells, with an average drilling encounter rate of 100% for high-quality reservoirs, an average drilling speed of 1.9 m/h to 8.6 m/h, and a drilling cycle of 233 d to 72 d. Practice has shown that the formed safe, efficient and fast drilling technology not only provides technical support for safe and efficient exploration and development, but also provides technical guarantees for increasing storage and ore preservation, as well as sustained and stable production.

10.11885/j.issn.1674 5086.2024.11.18.02