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为了达到低渗储层甲烷抽采过程甲烷采井优化设计和产能准确预测的目的,基于现场测井数据,采用非线性流体数值计算方法,以柳林煤层甲烷试验采区为例,对滑脱流动影响的煤层甲烷采场压力非线性分布和产能预测进行研究。数值计算结果表明:低渗储层甲烷运移采出受气体滑脱流动影响显著,考虑滑脱流动影响时,采场压力衰减区域变大,气体速率变快;对比测井产能历史拟合数据发现,计算所得的滑脱流动影响的产能预测值更加准确。由计算结果验证了单井开采具有采场压力影响范围较小,产能较低等缺点,并得出五采出四压裂的布井方式是既能够准确预测产能又能够更好避免井间干扰效应的最优布井方式。
In order to achieve the optimal methane production optimization design and production capacity prediction in low permeability reservoir methane recovery process, based on the field logging data, a nonlinear fluid numerical method was used to take the methane test in the Liulin coal seam as an example. Coal seam methane pressure field non-linear distribution and capacity prediction. The numerical results show that the methane migration and production in low permeability reservoirs are significantly affected by the gas slip flow. When considering the influence of slippage flow, the pressure attenuation area of the stope becomes larger and the gas velocity becomes faster. According to the historical data of well logging productivity, The predictive value of productivity affected by the calculated slippage flow is more accurate. The calculation results show that the single-well mining has the shortcomings of less influence of stope pressure, lower production capacity and so on. It is concluded that the well-drilling method with five production and four fracturing can not only accurately predict production capacity but also avoid cross-well interference The best way to effect wells.