页岩气藏多尺度渗流数值模拟研究

发布时间：2018-01-10 09:25

本文关键词：页岩气藏多尺度渗流数值模拟研究　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：页岩气的开发利用可以缓解传统化石能源短缺的问题,是全世界油气开发研究的重点问题。针对页岩储层微纳米级孔隙、页岩气藏赋存方式、渗流特征的复杂情况,本文首先基于页岩岩心的SEM图像,建立了微观形态下的页岩岩心等效毛管束模型,并模拟求解得到了页岩的渗透率,同时计算了考虑吸附效应影响时的页岩渗透率,结果表明考虑吸附影响时页岩渗透率较低。而后基于Langmuir吸附等温方程、离散裂缝网络模型以及质量守恒定律分别推导出了页岩气藏气体单相和气水两相在储层基质和裂缝孔隙中的渗流微分方程。最终得到了页岩气藏双重介质渗流数学模型。利用Comsol软件对建立的模型进行了参数求解和分析:地质参数方面,将传统双重介质模型和离散裂缝网络模型进行了对比,模拟结果表明利用离散裂缝网络模型的模拟结果更符合页岩气实际渗流状态;在人工改造参数方面,分析了压裂裂缝开度、数量以及长度对产气速度的影响,结果表明产气速度随着裂缝开度、数量以及长度的增大而增大,但对某一区域气藏来说,其增长效果递减,裂缝缝长对长期开发的影响更明显。此外,还研究了气水两相流动对页岩气开发的影响。模拟结果表明,在水相存在的前提下,页岩气的流动将更为困难,并且在井筒以及裂缝附近,会形成“水墙”,进一步阻碍气相的流动。
[Abstract]:The development and utilization of shale gas can alleviate the traditional fossil energy shortage, is a key problem of oil and gas development in the world. Based on the shale reservoir micro nano scale pore, shale gas occurrence, complex flow characteristics, this paper based on the shale core SEM image, set up the shale core equivalent capillary bundle model morphology of the simulated by considering the permeability of shale, shale permeability effect of adsorption when the calculation results show that considering adsorption effect when shale permeability is low. Then the Langmuir adsorption isotherm equations based on discrete fracture network model and mass conservation law were deduced for the shale gas reservoir and gas water gas two phase flow differential equation in reservoir matrix and fracture pore. The obtained model double media seepage mathematics of shale gas reservoirs. Based on Comsol software The model parameters were calculated and analyzed the geological parameters, the traditional dual media model and discrete fracture network model are compared. Simulation results show that the simulation results by using the discrete fracture network model with the actual state of gas seepage in rock hinge; artificial modification parameters, analyzed the fracture opening, affect the number of and the length of the gas production rate. The results show that the gas production rate with the crack width, number and length increases, but on a regional gas reservoir, decreasing its growth effect, fracture length impact on the long-term development of the more obvious. In addition, we also research the influence of gas water two-phase flow of shale gas developed. Simulation results show that in the premise of water exists, shale gas flow will be more difficult, and in the near wellbore and fracture, will form a "water wall", further hinder the gas phase flow.

【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE312

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