| 石迎爽,梁冰,薛璐,孙维吉*,李桥桥.多层煤层气藏合采特征及物理模拟实验方法研究[J].实验力学,2019,34(6):1010~1018 |
| 多层煤层气藏合采特征及物理模拟实验方法研究 |
| Study on the characteristics of multi-layer CBM reservoir mining and the experimental method of its physical simulation |
| 投稿时间：2018-06-01 修订日期：2018-10-07 |
| DOI：10.7520/1001-4888-18-135 |
| 中文关键词: 多层合采 层间距 井底压力 物理模拟 |
| 英文关键词:multi-layer combined mining layer spacing bottom hole pressure physical simulation |
| 基金项目:国家重点研发项目(2016YFC0801404)；国家自然科学基金面上项目(51874166)；辽宁省教育厅服务地方类项目A类(LJ2017FAL018) |
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| 中文摘要: |
| 多层合采是多层煤层气藏的有效开采方式之一，目前关于多层煤层气藏合采的实验研究较少。本文通过分析煤层气产气机理、多层煤层气藏储层特征和合采产气特征，提出了一种多层煤层气藏合采实验模拟方法。合采储层通过储层模拟系统实现，可模拟各储层的孔隙度、渗透率、储层压力、地应力等特性。由于层间距的存在，合采过程中各储层的实际井底压力是不相同的，在实验过程中各储层的井底压力通过井底压力模拟系统实现。为分析合采效果，提出了储层压降干扰率和产气量干扰率计算公式。开展了不同层间距条件下的多层煤层气藏合采模拟实验，结果显示模拟层间距的改变会通过改变各储层初次同时产气时的储层压力和生产压差来影响层间干扰程度；合采2h， 生产压差较小的模拟储层(2#模拟储层)受到的干扰程度大于生产压差较大的模拟储层(1#模拟除储层)，且2#模拟层的生产压差越小其受到的干扰程度越大。本文研究成果可为多层煤层气藏合采层位优选研究和影响因素研究提供参考。 |
| 英文摘要: |
| Multi-layer combined mining is one of the effective mining methods of multi-layer coal-bed methane (CBM) gas reservoir. At present, there are few experimental studies on the simultaneous exploitation of multi-layer CBM. In this work, based on the analysis of CBM gas production mechanism, reservoir characteristics and gas production characteristics of multi-layer CBM reservoir, an experimental simulation method of simultaneous exploitation of multi-layer CBM reservoir is presented. The reservoirs are simulated by the reservoir simulation system, which can simulate the characteristics of porosity, permeability, reservoir pressure and ground stress of each reservoir. Because of the existing of layer spacing, the actual bottom hole pressure of each reservoir obtained by the bottom hole pressure simulation system is different. In order to analyze the combined production effect, the formulas for calculating the disturbance rates of reservoir pressure drop and gas production are presented. The simulation experiments of simultaneous exploitation of multi-layer CBM reservoir under different layer spacings are carried out showing that changing the simulated layer spacing will affect the degree of interlayer interference by changing the reservoir pressure and production pressure difference when all reservoirs simultaneously produce gas. After two hours of double-layer mining, the interference degree of #2 simulation layer is greater than that of #1 simulation layer, and the smaller the pressure difference of #2 simulation layer is, the greater the interference degree is. The present work provides theoretical guidance for investigating the optimization and influencing factors of simultaneous exploitation of multi-layer CBM. |
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