致密油藏压裂水平井油气两相流试井模型研究与分析  

Oil-gas two-phase flow well test model analysis of fractured horizontal wells in tight oil reservoir

作　　者：周文武 李勇明[1] 郑杰 程垒明 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]四川川港燃气有限责任公司,四川成都610051

出　　处：《油气藏评价与开发》2017年第5期38-43,共6页Petroleum Reservoir Evaluation and Development

基　　金：国家自然科学基金重大项目"页岩地层动态随机裂缝控制机理与无水压裂理论"(51490653);国家重点基础研究发展计划"中国南方海相页岩气高效开发的基础研究"(2013CB228004)

摘　　要：致密油藏渗透率低、微裂缝发育,自然产能低,往往采用水平井结合多级体积压裂的方式进行高效开发,而在开发的过程中,广泛存在油气两相渗流。基于压裂水平井三线性模型,运用拟压力法,结合Warren-Root双重介质模型,建立了致密油藏压裂水平井油气两相流试井模型,对压力进行了求解与数值反演,并结合实例进行了计算与分析。结果表明,油气两相流对试井曲线有一定影响,含气饱和度越高越不利于油井高产稳产;总表皮系数、裂缝导流能力主要影响试井曲线的前期,总表皮系数越大则前期试井曲线越高,裂缝导流能力越大则前期裂缝与地层双线性流越明显;储容比与窜流系数主要影响试井曲线的后期,储容比越小则压力导数"凹子"越深,窜流系数越小则压力导数"凹子"出现的时间越晚。研究结果对致密油藏压裂水平井的试井解释与高效开发有重要的指导意义。In view of the tight oil reservoir with low permeability, micro fracture distribution and low nature productivity, the horizontal wells and multistage fracturing are widely used to achieve efficient development. Besides, oil-gas two-phase flow widely exists in the development process. Based on the tri-linear flow model and Warren-Root dual-porosity medium model, oil-gas twophase flow well test model of fractured horizontal wells in tight oil reservoir is established by using pseudo pressure. Then, the numerical solution is deduced from analytical solution and obtained by the numerical inversion algorithms. Finally, the result is analyzed by combining with the specific example. The study result shows that the oil-gas two-phase flow has some influences on the well test curves. The higher gas saturation goes against the high production. The earlier stage of well test curve is mainly influenced by total skin factor and fracture conductivity. The bigger the total skin factor is, the higher the position of well test curve will be. Also the bigger the fracture conductivity is, the more obvious the fracture and formation bilinear flow will be. The later stage of well test curve is mainly influenced by storage ratio and cross flow coefficient. The smaller storage ratio is, the deeper the hollow of the pressure derivative curve will be. And the smaller cross flow coefficient is, the later the hollow of the pressure derivative curve will appear. The result of this study has important guiding significance for the well test interpretation and efficient development of the fractured horizontal wells in tight oil reservoir.

关 键 词：致密油藏 压裂水平井 两相流 拟压力 双重介质 

分 类 号：TE353[石油与天然气工程—油气田开发工程]