黔西都格井田煤系气探采工艺研究  

Study on Coal Measures Gas Exploration and Exploitation Technology in Duge Minefield,Western Guizhou

作　　者：王福国 熊涛 刘亚然 毕彩芹 单衍胜 王行军 马国强 Wang Fuguo;Xiong Tao;Liu Yaran;Bi Caiqin;Shan Yansheng;Wang Xingjun;Ma Guoqiang(China Coal Geology Group Co.Ltd.,Beijing 100040;Oil and Gas Resources Survey Center,China Geological Survey,Beijing 100083)

机构地区：[1]中煤地质集团有限公司,北京100040 [2]中国地质调查局油气资源调查中心,北京100083

出　　处：《中国煤炭地质》2022年第3期45-49,70,共6页Coal Geology of China

基　　金：中国地质调查局地质调查项目(121201021000150014,12120115008201),中国煤炭地质总局科技创新项目(ZMKJ-2020-B-5)。

摘　　要：根据黔西都格井田以往煤层气地质工作成果,分析了该地区煤系气储层地质特征及分压合采开发工艺。结果表明,黔西都格井田具有盖层厚度大,煤系地层稳定,薄—中厚煤层发育,变质程度适中,原生裂隙发育,渗透性好,含气量与含气饱和度高,地层压力系数大的有利地质条件;按照煤层气探采结合一体化思路,对杨煤参1井进行压裂排采试验,采用“可钻式桥塞分层、光套管大排量注入分压合采”工艺,压裂3段(以煤层为主,顶板括射0.5m左右),建立以控制井底流压日降幅为核心的精细压差排采制度,最高产气量5011m^(3)/d,长期稳产量在4300m^(3)/d左右,产气效果良好。Based on previous CBM geological achievements from the Duge minefield,western Guizhou,the paper has analyzed coal measures gas reservoir geological features and separate pressure joint exploitation technology.The result has shown that the minefield has favorable conditions of thick overburden,steady coal measures strata,developed thin-medium thick coal seam,medium degree of metamorphism,developed primary fissures,good permeability,high gas content,gas saturation and large formation pressure coefficient etc.Based on CBM exploration and exploitation combined integration thinking has carried out the well YMC No.1 fracturing and drainage test,using the“drillable bridge plug layering and light casing large displacement injection separate pressure joint exploitation”technology,fractured 3 segments(mainly coal seams,roof perforation about 0.5m),a fine differential pressure drainage system taking the flow pressure downhole daily decreasing range control as the core has been established.Maximum gas production is 5,011m^(3)/d,long-term stable about 4,300m^(3)/d,thus favorable gas production effect achieved.

关 键 词：煤系气 分压合采 含气量 日产气量 都格井田 

分 类 号：P618.11[天文地球—矿床学]