文章摘要
渝东南地区龙潭组煤层气高效压裂及排采工艺探索
Exploration of Efficient Fracturing and Drainage Technology for Coalbed Methane in Longtan Formation of Southeast Chongqing
投稿时间:2023-06-21  修订日期:2023-06-21
DOI:
中文关键词: 煤层气  龙潭组  压裂工艺  排采制度  渝东南地区
英文关键词: coalbed methane  Longtan Formation  Fracturing process  Drainage and procurement system  Southeast Chongqing region
基金项目:“低压煤系气藏地质工程一体化高效开发技术”(编号 :P20074-1)、“中国石化煤层气勘探战略选区研究”(编号 :P21086-5)
作者单位邮编
李佳欣* 中石化重庆页岩气有限公司 408400
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中文摘要:
      渝东南地区煤矿资源丰富,具有极高的中深层煤层气开发潜力。目前该区块开发尚处于探索阶段,存在储层改造难度大、排采制度不明确、解吸规律认识不清、开发效益预估难等问题,且此区块前期部署的超深煤层气井NY1井生产借鉴意义有限。为此,对已钻老井的钻遇、测录井资料进行地质摸排筛选,确定D1井以龙潭组为开发试验对象,创新试验以“远支撑”为核心理念的大排量、大液量、大砂量、多轮次“有效支撑” 压裂技术体系,配合“快排上产-达产稳压”的排采工作制度,提高气井开发效率。结果表明,压裂显著改善储层导流能力,压完即见气,随着快速返排,气量日趋上涨逐步稳定于5000方/天以上。D1井“短见气周期”、高产、稳产,实现了渝东南地区中深层煤层气井成功开发0的突破,展示该区煤层气良好的开发潜力,以及对配套开发技术体系的形成具有极高的指导、借鉴价值。
英文摘要:
      The southeastern region of Chongqing is rich in coal mine resources and has high potential for the development of mid to deep coalbed methane. At present, the development of this block is still in the exploratory stage, and there are problems such as high difficulty in reservoir transformation, unclear drainage system, unclear understanding of desorption laws, and difficult estimation of development benefits. Moreover, the production reference significance of the ultra deep coalbed methane well NY1 deployed in the early stage of this block is limited. To this end, geological modeling and screening were conducted on the drilling and logging data of the drilled old wells, and the Longtan Formation was selected as the development test object for Well D1. The innovation experiment focused on the "far support" core concept of a large displacement, large liquid volume, large sand volume, and multiple rounds of "effective support" fracturing technology system, combined with the "fast discharge up production - reaching production and stabilizing pressure" drainage work system, to improve the efficiency of gas well development. The results show that fracturing significantly improves the reservoir conductivity, and gas can be seen immediately after fracturing. With rapid flowback, the gas volume is gradually rising and stabilizing at more than 5000m3/day. D1 well has achieved a breakthrough in the successful development of mid to deep coalbed methane wells in the southeastern region of Chongqing due to its "short gas cycle", high yield, and stable production. This demonstrates the good development potential of coalbed methane in the area and has high guidance and reference value for the formation of supporting development technology systems.
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