煤层气三孔介质渗透率动态变化规律研究及分析
Analysis on Dynamic Variation Rule of Coalbed Methane Triple Porosity Media Permeability
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- 引用格式:
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刘继芹,史萌萌,王晓刚,何伟.煤层气三孔介质渗透率动态变化规律研究及分析[J].天然气与石油,2015,33(1):0.doi:
Liu Jiqin, Shi Mengmeng, Wang Xiaogang, He Wei.Analysis on Dynamic Variation Rule of Coalbed Methane Triple Porosity Media Permeability[J].Natural Gas and Oil,2015,33(1):0.doi:
- DOI:
- 作者:
- 刘继芹1，2 史萌萌3 王晓刚1 何 伟2
Liu Jiqin, Shi Mengmeng, Wang Xiaogang, He Wei
- 作者单位:
- 1.中国石油西气东输管道公司储气库项目部，2.中国石油大学（华东）石油工程学院，3.中国石油西气东输管道公司香港支线工程建设项目部
1.Gas Storage Project Management Department, PetroChina West-East Gas Pipeline Company; 2.College of Petroleum Enginering, China University of Petroleum (East China); 3.Hongkong Branch Pipeline Construction Project Department, PetroChina West-East Gas Pipeline Company
- 关键词:
- 三孔介质；煤层气；动态渗透率
Triple porosity media; Coalbed methane; Dynamic permeability
- 摘要:
- 煤层气开采过程中，由于孔隙压力降低和吸附解吸作用的影响，储层孔隙度和渗透率会发生复杂变化。研究煤层气储层结构特征、赋存机理及渗流规律时，将煤层气储层表征为存在基质微孔、基质孔隙和裂缝孔隙系统的三孔介质。煤层气吸附在基质微孔表面，流体在基质孔隙和裂缝系统中渗流。利用多孔介质弹性力学理论，对煤层气基质孔隙及裂缝系统的孔渗动态变化和影响因素研究分析，在考虑孔隙压缩作用及基质微孔中气体在解吸作用影响下基质孔隙和裂缝系统动态变化，以及基质及裂缝之间的耦合应变特征条件下建立了煤层气基质孔隙及裂缝系统的三孔孔渗动态变化模型。
In the process of coalbed methane exploitation, pore pressure loss and adsorption and desorption of pores may result in complex changes in reservoir porosity and permeability. Researched are architectural features of coalbed methane reservoir, its gathering mechanism and permeability rule, coalbed methane reservoir is characterized as one kind of triple porosity media with matrix micropore, matrix macropore and fracture system. Coalbed methane is adsorbed on the matrix micropore surface and fluid flows only in the matrix macropore and fracture system. Conducted is analytical investigation on the dynamic change of porosity and permeabim matrix porosity and fracture system by using porous media elasticity theory, analyzed are the main affecting factors, considered are the effect of pores compression and gas desorption from matrix micropore on the dynamic change of matrix porosity and fracture system, described are the coupling characteristics of strain and established is the triple porosity permeability dynamic change model for coalbed methane matrix pore and fracture system.
