海上低渗致密砂岩气藏渗流模型研究  

Research on Seepage Model of Offshore Low Permeability Tight Sandstone Gas Reservoir

作　　者：王坤 闫正和[1] 杨勇 冯沙沙 文星 WANG Kun;YAN Zheng-he;YANG Yong;FENG Sha-sha;WEN Xing(Research Institute of CNOOC Shenzhen Branch,Shenzhen Guangdong 518054,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司研究院,广东深圳518054 [2]“油气藏地质及开发工程”国家重点实验室·西南石油大学,四川成都610500

出　　处：《当代化工》2021年第11期2648-2651,2655,共5页Contemporary Chemical Industry

基　　金：国家科技重大专项(项目编号:2016ZX05048-002);中国海洋石油总公司“十三五”科技重大项目(项目编号:CNOOC-KJ135ZDXM22LTD02SZ2016)。

摘　　要：结合压汞曲线来研究砂岩储层的分形维数,利用实验说明了致密气藏存在分形特性,通过推导计算了致密气藏分形维数,对于复杂的微小孔隙发育的砂岩孔隙结构,分形维数接近3。基于实验证实分形的基础上,考虑基质孔隙和裂缝存在分形特性,并考虑到致密气藏的应力敏感性,基于致密气在纳米级孔隙中的非达西流动特点,建立了新的分形致密气藏渗流模型,通过对模型进行求解的基础上研究了具有分形特性的致密气藏渗流规律。绘制并分析了不同参数影响下的压力动态典型曲线。通过分析表明,基质和裂缝分形参数都对压力动态产生影响,但影响的流动时期和阶段不同。传统的气藏模型是本文所建模型的特例。Mercury injection curves were used to study the fractal dimension of sandstone reservoirs,experiments were carried out to illustrate the fractal characteristics of tight gas reservoirs,and the fractal dimension of tight gas reservoirs was calculated through derivation.For sandstone pore structures with complex micropores,the fractal dimension was close to 3.Based on the experimental confirmation of the fractal,considering the fractal characteristics of matrix pores and fractures,and considering the stress sensitivity of tight gas reservoirs,based on the non-Darcy flow characteristics of tight gas in nano-scale pores,a new fractal tight gas reservoir seepage model was established.Based on the solution of the model,the seepage law of tight gas reservoirs with fractal characteristics was studied.The typical pressure dynamic curves under the influence of different parameters were drawn and analyzed.The analysis showed that the matrix and fracture fractal parameters had impact on the pressure dynamics,but the flow period and stage of the impact were different.The traditional gas reservoir model was a special case of the model built in this article.

关 键 词：致密气藏 分形 应力敏感性 压力动态 

分 类 号：TE312[石油与天然气工程—油气田开发工程]