Numerical Simulation Research On The Gas Reservoirs Of Water Solubility

The water-soluble gas refers to natural gas that dissolving in the formation water and making up of the methane primarily in the conventional reservoir condition, which the accumulation mechanism is based on the influences, such as temperature, pressure, water salinity, reservoir water capacity and so on. It has the vital practical significance to conducts research on the dissolved mechanism of water-soluble gas regarding to solve our country energy short problem because the amounts of resources only inferior to the natural gas hydrate. The development with the gas reservoir of water solubility has characteristics of the lower return-on-investment rate, longer investment cycle and higher risk; moreover there has not gas reservoir of water solubility to be developed in domestic, so the application of numerical simulation has especially important to forecast well the dynamic development material, choice the optimal development plan, reduce the development risk.With the investigation of the domestic and foreign literature systematically, the bases on the domestic and foreign present research and the comprehensive utilizations of the various knowledge of fluid mechanics in porous medium, reservoir engineering, mathematical physics, perforation completion, numerical simulation and so on, this article takes numerical simulation of gas reservoir of water solubility as the research aim which has completed following research works and obtained the corresponding research results: it analyzes the nature of the Water-soluble gas and formation water as well as the influent factors of the solubility through the study of massive materials; It establishes mathematical models three-dimension, the dual medium, the gas-water phase through the way of finite difference in the migration of water-soluble gas, which describes the entire process of release, migration and production in formation, where it considered the problems of variable bubble point; According to the numerical models of gas reservoir of water solubility it provides solution procedure that based on black oil model; It discovers that there will obtain the good effects in the lowly speed of development through simulation; the reinjection of formation water may largely enhance the produce degree of water-soluble gas when we consider reinjection in simulator; It considered the influence of perforated completion on development so as to increase the simulator's versatility, It discovers that the simulator may reflect the conditions of development when we exanimate he simulator's reliability with the empirical datum.It will provide the advantageous technology and the theory support for the development effect appraisal of the gas reservoir of water solubility through systematic research on numerical simulation of it.