摘要
为表征扩散、应力敏感、基质收缩和吸附层对页岩气渗透率的影响,通过加权系数耦合过渡扩散和努森扩散,建立了扩散渗透率数学模型,并通过实验进行验证,同时分析了基质收缩、应力敏感、不同孔径页岩气吸附层厚度对渗透率的影响。研究结果表明,建立的页岩气渗透率模型可以有效表征不同传输阶段的扩散,避免了单独使用努森扩散所带来的渗透率偏大等问题,可以更全面地描述多物理场影响的页岩气传输。该研究成果对页岩气的开发具有一定的借鉴意义。
To characterize impacts of diffusion, stress sensitivity, matrix shrinkageand adsorption layer on shale gas permeability, weighting coefficient coupled transitional diffusionand Knudsen diffusion have been deployed to con- struct the mathematic modelfor diffusion permeability. Relevant tests have been performed to verify the model. At the same time, impacts of matrix shrinkage, stress sensitivity and thicknesses of shale gas adsorption layers with dif- ferent pore diameters on permeability have been reviewed. Research results show the proposed shale gas permeabili- ty model can effectively characterize diffusion in different transmission stages to eliminate problems related to higher permeability induced by using Knudsen diffusion alone. It can be seen that the newly-constructed model can better describe shale gas transmission under impacts of multiple physical fields. Relevant research results may provide val- uable guidance for shale gasdevelopment.
作者
赵谦平
王博涛
姜磊
付顺勋
曹成
Zhao Qianping Wang Botao Jiang Eel Fu Shunxun Cao Cheng(Shaanxi Yanchang Petroleum （ Group ） Co. Ltd., Xi＇ an, Shanxi 710075, China PetroChina Changqing Oilfield Company, Xi ＇ an, Shanxi 710299, China Shaanxi Yanchang Petroleum （Group） Co. Ltd., Yah＇ an , Shanxi 716000,China PetroChina Changqin~, Oilfield Company. Xi ＇ an. Shanxi 710018. China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第2期125-130,共6页
Special Oil & Gas Reservoirs
基金
国家高技术研究发展计划(“863”计划)“页岩气钻完井及储存评价与产能预测技术研究”(2013AA064501)
陕西省科技统筹创新工程计划“陆相页岩气资源地质研究与勘探开发关键技术攻关”(2012KTZB03-01-01)
关键词
页岩气
渗透率
扩散
基质收缩
应力敏感
吸附层
shale gas
permeability
diffusion
matrix shrinkage
stress sensitivity
adsorption layer
