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As the development of the block gas reservoir with abnormal high pressure and strong bottom water entering the middle and late stage, it is faced with the problem of how to further improve the reserves utilization and recovery rate. Taking bashijiqike formation in Kela 2 gas field as an example, the influence of edge and bottom water communicated by micro-faults in the middle and upper part of the reservoir was not considered during development, and the quantitative description accuracy of high permeability strip and interlayer was not high, which leads to unclear understanding of the mechanism of water invasion; The precision of existing geological and numerical models is not enough to meet the fine prediction of residual gas distribution in later stage; After water flooding, the productivity of gas reservoir decreases greatly, so it is necessary to further demonstrate the reasonable gas production rate to enhance recovery factor. In view of the problems faced by this kind of gas reservoir, micro-fault characterization, fine description of gas reservoir, dynamic and static characterization of dominant water intrusion channels, integration of multi-scale discrete fracture embedded modeling technology, at the same time, the development mechanism is studied, and the key development parameters are optimized, which effectively guides the formulation of comprehensive adjustment countermeasures. The results show that: (1) The water invasion of Kela 2 gas reservoir has obvious zonality, which is characterized by strong and obvious non-uniform water invasion in east and west, and relatively weak water invasion at the bottom, south and north. (2) Formation water invades the gas reservoir non-uniformly along the high permeability layer, and, there are still low permeability unflooded layers in the flooded area; (3) It is demonstrated that the recovery degree is the highest and the development effect of gas reservoir is the best when the reasonable gas recovery rate is 2.2%, and based on the aggravation of water invasion situation, the paper puts forward the technical countermeasures of collaborative development and adjustment of “production Control + layer adjustment + drainage”, the recovery rate can be increased by about 6% by the end of the period.

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Study on Adjustment Countermeasures of Abnormal High Pressure and Bottom Water Blocky Gas Reservoir in Middle and Late Stage of Development—Taking Bashijiqike Formation in Kela 2 Gas Field as an Example

  • 会议论文

  • 发表日期：

    2025年

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  • Hui Wang,
  • Xinluo-Feng,
  • Xue Yan,
  • Min Wang,
  • Yajuan-Wang,
  • Chen Dong,
  • Na Lin,
  • Yanli-Wang

摘要

As the development of the block gas reservoir with abnormal high pressure and strong bottom water entering the middle and late stage, it is faced with the problem of how to further improve the reserves utilization and recovery rate. Taking bashijiqike formation in Kela 2 gas field as an example, the influence of edge and bottom water communicated by micro-faults in the middle and upper part of the reservoir was not considered during development, and the quantitative description accuracy of high permeability strip and interlayer was not high, which leads to unclear understanding of the mechanism of water invasion; The precision of existing geological and numerical models is not enough to meet the fine prediction of residual gas distribution in later stage; After water flooding, the productivity of gas reservoir decreases greatly, so it is necessary to further demonstrate the reasonable gas production rate to enhance recovery factor. In view of the problems faced by this kind of gas reservoir, micro-fault characterization, fine description of gas reservoir, dynamic and static characterization of dominant water intrusion channels, integration of multi-scale discrete fracture embedded modeling technology, at the same time, the development mechanism is studied, and the key development parameters are optimized, which effectively guides the formulation of comprehensive adjustment countermeasures. The results show that: (1) The water invasion of Kela 2 gas reservoir has obvious zonality, which is characterized by strong and obvious non-uniform water invasion in east and west, and relatively weak water invasion at the bottom, south and north. (2) Formation water invades the gas reservoir non-uniformly along the high permeability layer, and, there are still low permeability unflooded layers in the flooded area; (3) It is demonstrated that the recovery degree is the highest and the development effect of gas reservoir is the best when the reasonable gas recovery rate is 2.2%, and based on the aggravation of water invasion situation, the paper puts forward the technical countermeasures of collaborative development and adjustment of “production Control + layer adjustment + drainage”, the recovery rate can be increased by about 6% by the end of the period.