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本文在总结前人已有成果的基础上,在裂缝性低渗透油藏流-固耦合研究方面完成了以下工作: (1)通过大量的岩芯实验,研究发现低渗透岩石渗流时存在明显的流-固耦合效应,并通过理论分析对该现象做以解释。 (2)建立裂缝性低渗透油藏渗流场和岩土变形场的等效连续介质模型。推导出考虑裂缝影响情况下,渗流场和岩土变形场参数的等效处理方法。利用等效连续介质渗流模型研究了不同裂缝形态对水驱油效果的影响。 (3)研究了地应力和孔隙压力对裂缝开度及渗透率的影响,得出裂缝性低渗透油藏渗流场与岩土变形场之间的耦合关系式。 (4)利用断裂力学的知识,研究了注水过程中,储层裂缝扩展的动力学机理,给出考虑裂缝扩展情况下的渗透率演化方程,并结合流-固耦合模型给出数值模拟的方法。 (5)利用有限元和有限差分方法,给出了裂缝性低渗透油藏流固耦合模型的计算方法,并编制了相应的数值模拟软件。 (6)探讨了本文理论在工程上的应用。 论文利用所编制的油藏流团耦合计算软件,对大庆油田卯六区块开发过程中孔隙度、渗透率演化及耦合效应对开发过程的影响进行了数值模拟;结合断裂力学知识,给出了开发过程中裂缝扩展的数值计算方法,并对一简单情况下裂纹扩展情况进行了数值计算;最后,通过解析分析的方法,对渗流作用井壁力学
Based on the conclusion of previous achievements, this paper has done the following work in the fluid-solid coupling research of fractured low permeability reservoirs: (1) Through a large number of core experiments, it is found that there is obvious Fluid-solid coupling effect, and explain the phenomenon through theoretical analysis. (2) Establish equivalent continuum model of seepage field and deformation field of fractured low permeability reservoir. The equivalent treatment method of seepage field and geotechnical deformation field considering the influence of cracks is deduced. Equivalent continuum seepage model was used to study the effect of different fractures on water flooding. (3) The influence of in-situ stress and pore pressure on the crack opening and permeability is studied, and the coupling relation between seepage field and geotechnical deformation field of fractured low permeability reservoir is obtained. (4) Based on the knowledge of fracture mechanics, the dynamic mechanism of reservoir fracture propagation during waterflooding is studied, and the evolution equation of permeability under fracture propagation is given. The numerical simulation method is given in combination with the fluid-solid coupling model . (5) By means of finite element method and finite difference method, the computational method of fluid-structure coupling model for fractured low-permeability reservoirs is given, and corresponding numerical simulation software is compiled. (6) discusses the application of this theory in engineering. In this paper, we use the software of the coupling of flow groups in the reservoir to simulate the influence of the porosity, permeability evolution and coupling effect on the development process in the development of the 86 zone in Daqing Oilfield. Combined with the knowledge of fracture mechanics, In the process of numerical simulation of crack propagation in the process of development, the crack propagation in a simple case is numerically calculated. Finally, by means of analytical analysis,