排采面积对煤层气单井产气潜能影响分析

发布时间：2018-05-08 07:26

本文选题：煤层气井 + 单井产气量　；参考：《煤炭科学技术》2017年03期

【摘要】：针对煤层气井有效排采时间短的问题,基于煤层气井稳定渗流方程和朗格缪尔吸附定律,建立了径向流煤层气井和压裂煤层气井排采面积影响单井产气潜能的数学模型,分析了排采面积对单井产气潜能的影响,并研究了煤层气井单井控制的有效解吸边界。结果表明:压裂煤层气井和径向流煤层气井解吸量与解吸半径之间的变化趋势大致相同,其解吸量随着解吸半径的增加接近于二次函数变化,解吸半径增加10倍,解吸量大约增加46倍。排采面积越大,煤层气井产气潜能越大。径向流煤层气井井底压力为1.0 MPa时,其单井控制解吸边界半径为99.73 m,其有效解吸边界的研究为煤层气开采合理布置井网提供了依据。
[Abstract]:Aiming at the problem of short effective recovery time of coalbed gas wells, based on the steady seepage equation of coalbed gas wells and Langmuir's adsorption law, a mathematical model of radial flow coalbed gas wells and fracturing coalbed gas wells is established, which affects the gas production potential of single well. The effect of production area on gas production potential of single well is analyzed, and the effective desorption boundary of single well control in coalbed methane well is studied. The results show that the desorption rate and desorption radius of fractured coalbed gas wells and radial flow coalbed gas wells are approximately the same, and the desorption amount is close to the quadratic function with the increase of the desorption radius, and the desorption radius increases by 10 times. The amount of desorption increased by about 46 times. The larger the drainage area, the greater the gas production potential of coalbed gas wells. When the bottom hole pressure of the radial flow coal-bed methane well is 1.0 MPa, the controlled desorption boundary radius of the single well is 99.73 m. The study of the effective desorption boundary provides the basis for the reasonable layout of the well pattern for the coalbed methane production.
【作者单位】：中国石油大学(华东);中联煤层气有限责任公司;
【基金】：国家自然科学基金资助项目(51174224) 国家科技重大专项资助项目(2016ZX05066004-002) 中央高校基本科研业务费专项资金资助项目(16CX02004A)
【分类号】：TE37

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