提高煤层气采收率新技术分析  

Analysis on New Technologies to Enhance CBM Recovery

作　　者：许春花[1] 赵冠军[1] 龙胜祥[2] 陈纯芳[2] 李辛子[2] 叶欣[2] 颉保亮[3] 

机构地区：[1]成都理工大学,四川省成都市610059 [2]中国石化石油勘探开发研究院,北京100083 [3]中国矿业大学(北京),北京100083

出　　处：《中国石油勘探》2010年第3期51-54,72,共5页China Petroleum Exploration

摘　　要：影响我国煤层气采收率的主要因素是煤层储层条件和开发技术,可以通过改善钻完井技术和增产技术来提高煤层气采收率。分析了常用钻完井技术、压裂技术和注气技术存在的一些缺点,认为短半径径向水平井技术兼有完井和增产的作用,可以大幅度增加单井的产能;高能气体压裂技术能够改善储层导流能力并保护煤储层,减小对煤储层造成水敏性污染,降低成本;通过注气前、后的瓦斯浓度及流量随时间的变化曲线,说明混合气体驱替煤层气有明显的效果。Coal seam reservoir conditions and development technologies are the major factors that influence China's CBM recovery.CBM recovery can be increased by improving drilling and completion technologies and stimulation technologies.Some shortcomings of commonly-used drilling and completion technologies,fracturing technologies,and gas injection technologies are analyzed,it is believed that the short radius radial horizontal well technology has the function of completion and stimulation and it can increase the single-well productivity substantially.The high-energy gas fracture technology can improve the reservoir conductivity and protect coal reservoir,decrease contamination to coal reservoir caused by water sensitivity,and reduce costs.The gas concentration and flow rate before and after gas injection change with time,indicating that gas mixture enhanced CBM recovery(G-ECBM) has obvious effect.

关 键 词：煤层气 采收率 径向水平井 高能气体压裂 混合气体驱替 

分 类 号：TE122.2[石油与天然气工程—油气勘探]