煤矿采动条件下煤层气储层模型及应用

发布时间：2018-06-04 01:16

本文选题：采动条件 + 煤层气　；参考：《煤田地质与勘探》2017年06期

【摘要】：煤矿区煤层气开发受煤矿采动影响,为实现煤矿采动条件下煤层气井产能数值模拟,抽象概化了采动条件下煤层气开发的地质模型,构建了采动条件下煤层气储层的数学模型,并通过对CBM-SIM软件二次开发,实现了采动条件下煤层气储层的数值模拟。在建模和数值解算软件开发中,基于采动离层量变化曲线公式构建了采动条件下储层渗透率变化曲线公式,利用采动井水位变化规律构建了储层漏失水量变化公式,利用时间卡机制解决了煤储层渗透率及漏失水量的动态求解和循环迭代过程中作为系数和边界条件的调用赋值,实现了渗透率随采动影响的动态变化、储层水漏失降压和储层产气的耦合解算。应用开发的软件对淮南矿区某矿采动条件下煤层气抽采井生产数据进行历史拟合和产量模拟应用,预测煤层气产量曲线与实际生产曲线基本一致,判定系数达到0.92。
[Abstract]:In order to realize the numerical simulation of coalbed methane well productivity under mining conditions, the geological model of coalbed methane development under mining condition is abstractly generalized, and the mathematical model of coalbed methane reservoir under mining condition is constructed. Through the secondary development of CBM-SIM software, the numerical simulation of coalbed methane reservoir under mining condition is realized. In the course of modeling and numerical calculation software development, the formula of reservoir permeability change curve under mining condition is constructed based on the formula of the variation curve of the production displacement rate, and the formula of the reservoir water leakage change is constructed by using the variation rule of the water level of the mining well. The time card mechanism is used to solve the dynamic solution of permeability and loss of water in coal reservoir and the transfer assignment as coefficient and boundary condition in the process of cycle iteration, and the dynamic variation of permeability with the influence of mining is realized. Coupling solution of reservoir water leakage and gas production. By using the developed software, the production data of coalbed methane extraction wells under mining conditions in Huainan mining area are fitted and simulated. The predicted CBM production curve is basically consistent with the actual production curve, and the judgment coefficient is 0.92.
【作者单位】：煤炭科学研究总院;中煤科工集团西安研究院有限公司;
【基金】：国家科技重大专项课题(2011ZX05040-002)~~
【分类号】：TE319

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