天然气地球科学

• 非常规天然气 • 上一篇    

沁水盆地柿庄区块煤层气井排采动态影响因素分析及开发对策研究

姜杉钰1,康永尚1,2,张守仁3,4,叶建平3,4,张兵3,4,王金1,吴见3,4   

  1. 1.中国石油大学(北京)地球科学学院,北京 102249;
    2.油气资源与探测国家重点实验室,北京 102249;
    3.中海石油(中国)有限公司非常规油气分公司,北京 100011;
    4.中联煤层气有限责任公司,北京 100011
  • 收稿日期:2015-12-06 修回日期:2016-03-09 出版日期:2016-06-10 发布日期:2016-06-10
  • 通讯作者: 康永尚(1964-),男,河南登封人,教授,主要从事非常规油气勘探开发和油气储量和价值评估研究. E-mail:kangysh@sina.com.
  • 作者简介:姜杉钰(1992-),男,吉林白山人,硕士研究生,主要从事煤层气开发地质研究. E-mail:jsy921101@qq.com.
  • 基金资助:
    国家科技重大专项(编号:2011ZX05042)资助.

Analysis on influencing factors of drainage dynamic of wells and CBM development strategy in Shizhuang block

Jiang Shan-yu1,Kang Yong-shang1,2,Zhang Shou-ren3,4,Ye Jian-ping3,4,Zhang Bing3,4,Wang Jin1,Wu Jian3,4   

  1. 1.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China;2.State Key Laboratory of
    Petroleum Resources and Prospecting,Beijing 102249,China;3.Unconventional Oil & Gas Branch,CNOOC China Ltd.,
    Beijing 100011,China;4.China United Coalbed Methane CorporationLtd.,Beijing 100011,China
  • Received:2015-12-06 Revised:2016-03-09 Online:2016-06-10 Published:2016-06-10

摘要: 柿庄煤层气区块呈现“见气井数量少,单井产量低”的开发现状。为研究该区块煤层气井排采动态的影响因素,提出有效的煤层气开发对策,通过提取柿庄区块59口煤层气井排采动态典型指标,分析该区块煤层气井排采动态特征,同时研究断裂构造、压裂缝类型和煤层顶底板岩性组合对煤层气井排采动态的影响,并据此提出了合理的开发对策。研究表明:柿庄区块部分煤层气井产水过高对产气效果起抑制作用,过高的产水量主要是由外源水补给造成的。断裂构造易沟通煤层顶底板含水层,导致煤层气井高产水难产气或不见气;煤层发育的压裂缝中,水平压裂缝提高单井产气量效果差,而直立压裂缝在顶底板岩性组合有利时能有效提高单井产气量,反之则易沟通含水层导致产水量增加。柿庄区块煤层气开发在井位优选时,应重点选择在远离断裂构造、发育直立压裂缝且顶底板岩性组合好的煤层气富集区内部署井位;在多煤层合采时,应注意避免排采潜在的高产水煤层,保证煤层气有效产出。

关键词: 柿庄区块, 煤层气, 排采动态, 影响因素, 断裂构造, 压裂缝类型, 岩性组合, 开发对策

Abstract: Most CBM wells have no or low gas production in Shizhuang block and the reason has been not clear.Based on typical drainage dynamic index of 59 CBM wells in Shizhuang block,the drainage dynamic characteristics are analyzed and three key influencing factors including fault structure,hydraulic fracture type and lithological assemblage type are identified,leading to suggestions on CBM development strategy.The study shows that high water production will reduce the gas production of CBM wells in Shizhuang block and water mainly comes from the aquifers surrounding the coal seams.Fault structures constitute natural flow pass way to communicate coalbeds with aquifers in coal measures and potentially result in high water production which impedes gas production.Horizontal hydraulic fractures are generally less effective for increasing gas production,however,vertical hydraulic fractures are more effective if the lithological assemblage type is favorable but it may extend into adjacent aquifer and lead to high water production on the contrary.Finally it is suggested that favorable regions with no faults,vertical hydraulic fractures and a favorable lithological assemblage types should be selected for CBM development,and potential high water production coal seams,when multi-layer drainage technology is applied,should be avoided for stimulating.

Key words: Shizhuang block, Coalbed methane, Drainage dynamic, Influecing factors, Fault structure, Type of hydraulic fractures, Lithological assemblage, Development strategy

中图分类号: 

  • TE122.2+3

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