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我国页岩、致密油气等非常规油气的储量极大,非常规油气的开发对保障国家能源安全有重要的意义.准确模拟预测非常规油气的流动行为是经济高效开采的关键.不同于常规油气,页岩气在地层中存在滑脱效应以及吸附现象,为准确描述此类机理和现象,本文在以非结构PEBI网格为主的混合网格的基础上建立了组分数值模型,并对气体组分比例、吸附作用以及滑脱效应对产能的影响进行了分析.同时,对国内某页岩气藏水平井的压裂进行了优化.结果表明,页岩气产量随裂缝数量的增多以及裂缝半长的增长而增加,但当裂缝数量达到一定数量,裂缝半长达到一定长度时,产量的增加不再明显.因此,为使页岩气的经济效益达到最大化,应合理布置裂缝数量及裂缝半长.
China’s shale, tight oil and gas and other unconventional oil and gas reserves are very large, unconventional oil and gas development to the protection of national energy security is of great significance.Equitable simulation of unconventional oil and gas flow behavior is the key to cost-effective mining.Different from conventional oil and gas In order to accurately describe such mechanism and phenomena, shale gas exists slippage effect and adsorption phenomena in the formation. Based on the mixed meshes based on unstructured PEBI grids, a numerical model of components is established and the gas Component ratio, adsorption and slippage effect on productivity were analyzed.At the same time, the horizontal well fracturing in a shale gas reservoir in China was optimized.The results show that the productivity of shale gas increases with the increase of the number of fractures and the fracture half However, when the number of cracks reaches a certain amount and the length of cracks reaches a certain length, the increase of output is no longer obvious. Therefore, in order to maximize the economic benefits of shale gas, the number of cracks and cracks should be reasonably arranged Half length.