中国陆上油气水平井技术成效及新思考

Discussions about China Onshore Horizontal Drilling Technology

中国是世界上水平井技术实力较强的国家之一,陆上水平井体系中有L形水平井、套管开窗侧钻水平井、多分支水平井、多阶梯水平井、水平分支井和连通水平井等6个系列,每个系列中又有较多的种类。水平井在中国陆上油气田整体开采、治理边底水、提高薄油层产出能力和油气勘探开发评价等方面卓有成效,促使更大规模地应用水平井。在全面分析水平井技术成效的基础上指出:钻水平井要注重保护储集层,提高水平井段储层钻遇率,提高水平井的产量;水平井开发方案论证应超前,以有效避免水患出现;应尽快改变井下作业技术滞后的局面;钻井工艺技术科研立项要全方位进行;加快进入水平井国际市场的步伐。

China is one of countries with the advanced horizontal drilling technology. Onshore horizontal well system consists of L-shaped horizontal wells, casing sidetrack horizontal wells, multilateral wells, multi-step horizontal wells, horizontal multilateral and interconnecting horizontal wells, etc. Each type of well system can be classified into more subdivisions. Horizontal well has been successfully used to produce onshore reservoirs, to control bottom and edge water, to improve productivity of thin pay zones and to evaluate oil and gas exploitation, etc. Based on the comprehensive analysis for the technique of horizontal wells, this paper suggests that drilling horizontal wells must emphasize pay zone protection, increase the pay zone hit ratio, and increase production rate of the horizontal well. The production proposal should be justified to avoid problems caused by water. The lag of downhole service technology should be improved as soon as possible. The research and development in drilling technology should be implemented comprehensively to speed up the pace of entering the international horizontal well market.