Numerical simulation study on the volcanic gas reservoirs in block C of Xushen Gasfield

Abstract

Block C of Xushen Field is one kind of the volcanic reservoirs with the bottom water. Since the development, the dynamic characteristics of the block are characterized by large differences in gas well productivity, formation water production, and low effective utilization of reserves. Using the dual-medium numerical model, through historical simulation and combination with gas well dynamic, the block pressure and, water body changes and remaining reserves distribution characteristics are clarified. The research shows that the remaining reserves of the block are mainly concentrated in the vicinity of xs901, xs903-p1 and the northwest periphery of xs902. With the increase of production allocation, the water production of six old wells such as XS9-7 increased rapidly and significantly, while the bottom water coning was obvious. Through six sets of gas production rate development plans with different magnification, consider whether the gas distribution can stabilize the output, water production, bottom hole flow pressure, and fluid accumulation. The optimal development plan of the old well in the block is determined comprehensively.