摘要
我国煤层气整体构造复杂且有诸多地质相似性,随着近年来逐步向中深部、超低渗、构造复杂区域迈进,总结探索一套复杂区域高效开发手段对盘活国内大批煤层气资源意义重大。以早期低产且地质相对复杂的郑庄区块的成功实践为例,针对区块高阶煤断裂构造复杂、非均质性强、渗透率低、早期工程技术匹配欠缺、早期达产率不足30%等不利因素和问题,通过深化煤层气地质富集规律研究和新技术研发与应用,形成了甜点区优选和高效开发理论,应用二开全通径水平井优快钻井、疏导式增产改造、定量化疏导排采控制等系列技术,大幅度提高单井产量,方案达产率由最初的29.3%提升至98.5%。实践研究认为:(1)及时有效的开发方案调整能够实现复杂低渗的高阶煤煤层气高效开发,为技术持续升级提供了空间与平台。(2)丛式井组滚动运行方式可有效降低产建风险,使整体方案达产率提高20%以上。(3)水平井地质–工程一体化技术的持续创新,是实现达产率整体提升的关键。
The geological conditions of various CBM sites in China are complicated and features similarly.With the recent development of exploring CBM towards the medium-deep, ultra-low permeability and structurally complex areas, it is of great significance to develop a set of efficient exploring techniques in complex areas to revitalize a large number of domestic CBM resources. Taking an example of the successful development of Zhengzhuang Block with early low yield and relatively complex geology, it had faced a series of problems, including complex geological conditions with internal fracture, strong heterogeneity, low permeability, lack of corresponding developing technologies for the early stage development, production rate less than 30% in the early stage. The sweet area optimization and efficient development theory was developed through deepening the research on CBM geological enrichment law and the development and application of new technologies. With these proposed techniques on optimal rapid drilling, dredging capacity increasing revamp and quantitative dredging and drainage control in two-open full-diameter horizontal wells, the production of single well was greatly increased, and the project yield increased from 29.3% to 98.5%. The research results indicate:(1) Timely and appropriate adjustment on the development plan is essential for the successful development of complex and low-permeability high-rank coalbed methane, providing space and platform for the continuous improvement in CBM exploring techniques;(2) The rolling operation mode of cluster well group can significantly reduce production and construction risks, and increase the overall scheme productivity by more than 20%;(3) The continuous innovation of horizontal well geology and engineering integration technology is a key element to achieve the overall improvement of productivity.
作者
朱庆忠
李志军
李宗源
王三帅
孙瑞雪
王玉婷
肖宇航
王静
王景悦
关小曲
ZHU Qingzhong;LI Zhijun;LI Zongyuan;WANG Sanshuai;SUN Ruixue;WANG Yuting;XIAO Yuhang;WANG Jing;WANG Jingyue;GUAN Xiaoqu(PetroChina Huabei Oilfield Company,Renqiu 062552,China;CNPC Pilot Test Base of CBM Exploration and Development,Renqiu 062552,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2023年第1期131-138,共8页
Coal Geology & Exploration
基金
国家科技重大专项项目(2017ZX05064)
中国石油股份公司重大专项课题(2017E-1404)。
关键词
高阶煤煤层气
新区产建
高效开发
水平井
地质-工程一体化
high-rank coal CBM
production and construction of new area
high-efficient development
horizontal well
geology and engineering integration
