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织金区块煤层气井产气量影响因素分析

Influence factor analysis for coalbed methane production in Zhijin Block

  • 摘要: 为了提高织金区块多薄煤层气井产气量,探索有效的排采制度,结合研究区内探井和小试验井组的生产数据,通过对区块地质条件、储层压裂改造、配套工艺和排采制度4个方面的对比分析,总结出织金区块煤层气井产气量的主要影响因素。研究表明:织金区块高产井目的层埋深主要集中在500~700 m,采用4段逐层压裂且施工加砂强度在10~15 m3/m、加液强度大于150 m3/m时产气量可达1 000 m3以上;最终总结出适合织金区块的“五段三压”、“避峰求面”、“面积降压”的“阶段降压 ”的排采模式,提高了经济效益,为该区块后续大规模开发及类似煤层气田的勘探开发、排采制度的制定提供了借鉴。

     

    Abstract: Analysis of geological condition, reservoir fracture treatment, matching technology, and drainage system were performed to improve the coalbed methane production in Zhijin Block. The influence factor analysis was also conducted. The results show that the depth of the most productive gas well in Zhijin Block is between 500 and 700 m. The gas production could reach 1 000 m3 when the following criteria are satisfied-using four-stage fracturing,intensity of gravel input between 10 and 15 m3/m, and intensity of liquid input higher than 150 m3/m. A drainage system that is suitable for Jinzhi Block is proposed, which includes four drainage technologies, namely five-segment compression, peak avoidance, area decompression, and regional decompression. This paper provides reference for future coalbed methane exploration in Zhijin Block and in other similar coalbed methane fields as well.

     

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