Study On Numerical Simulation Of High Pressure Carbonate Gas Reservoir

In recent years, high pressure carbonate gas reservoir exploration achieved fruitful results, such as the gas field in east of Sichuan, northeast of Sichuan and so on, how to develop these gas reservoirs is one of the issues that need urgent solutions. High pressure carbonate gas reservoir scientific development needs to solve the dynamic prediction problem. In the process of high pressure carbonate gas reservoir prediction, there are the following problems:First, carbonate reservoirs is made up of two parts, natural fractures and the matrix. In the process of the production, the reservoir pressure will decline, the natural fracture will close and rock matrix will be compressed; second, the high-speed flow of natural gas will be affected by non-Darcy effect, especially in the high pressure carbonate gas reservoir; third,, Klinkenberg effect exists in the flow of natural gas.To solve the above problems, this paper will base on filtration theory, studied high pressure carbonate gas reservoir matrix and the crack between the exhaust for a variety of ways, the mechanism of matrix deformation and fracture, high-speed non-Darcy effect and Klinkenberg effect, how the factors affects the flow. Taken into account all the factors, established the dual media air-water two-phase flow of there-dimensional mathematical model and numerical model. By using VB6.0 programming language developed carbonate gas reservoir numerical simulators, analyzed the impact of different factors and different working systems on gas reservoir development. On this basis, combined with the actual data of HeBa-1 Well, studied a single well simulation, did history matching and performance prediction, verify the research results, improved the establishment of the seepage model.Finally, through numerical simulation case studies, summarized the seepage law of carbonate gas reservoirs in the development process, formed a dual media air-water two-phase theory of nonlinear flow. The theory of high pressure is helpful to research complex carbonate reservoir seepage law accurately, and it has been a complete complex carbonate gas reservoir percolation mechanism for scientific and rational and efficient development of such a carbonate gas reservoir, it is the theoretical basis.