我国非常规油气经济有效开发钻井完井技术现状与发展建议

我国非常规油气资源储量丰富,探索经济有效开发的钻井完井技术体系,是加快其勘探开发进程与规模上产的关键.详细介绍了我国已形成的埋深3500 m以浅非常规油气钻井完井技术体系,包括三维丛式井水平井井眼轨道设计、地质工程一体化设计与作业、强化钻井参数提速、深层页岩气控温钻井、地质导向钻井、高性能钻井液和高效固井等关键技术,指...

The Up-to-Date Drilling and Completion Technologies for Economic and Effective Development of Unconventional Oil & Gas and Suggestions for Further Improvements

Abundant reserves of unconventional oil & gas resources occur in China. Exploring drilling and completion technology systems for the economic and efficient development is the key to speeding up the exploration and development process and scale up their production. This paper expounds the drilling and completion technology systems developed by Chinese researchers for unconventional oil & gas at less than 3 500 m depth. The key technologies in the systems involved wellbore trajectory design for three-dimensional cluster horizontal wells, design and operation of geology-engineering integration, rate of penetration (ROP) enhancement through drilling parameter optimization, managed temperature drilling of deep shale gas, geosteering, high-performance drilling fluid, and efficient cementing, etc. Nevertheless, it was noted that this systems still fell short in several ways. For example, optimal implementation of factory operation has yet to be achieved, the repeatability of horizontal well drilling with long horizontal sections was poor, the "one-trip drilling" technology and supporting equipment were not well established, and high-temperature and high-pressure (HTHP) resistant materials and supporting drilling tools were scant. Suggestions for further improvements were also put forward, such as accelerating the promotion of factory operation for large-platform cluster horizontal wells, continuously optimizing drilling technologies for horizontal wells with long horizontal sections, fulfilling the notion of geology-engineering integration, and conducting research & development (R & D) of HTHP resistant materials and developing supporting tools. These measures were expected to substantially boost the single well production and the recovery rate and thereby achieve efficient exploration and development of unconventional oil & gas.