Numerical simulation of gas wells in different types of carbonate reservoirs

Abstract

The geological conditions of carbonate reservoirs are complex, and there are multi-media of pores, vuggy, and fractures with different scales. The macroscopic Heterogeneity of carbonate reservoirs is very strong, and the difference between wells is very large, which leads to the great difference in the production of different types of reservoirs and the difficulty in product evaluation. It is also difficult to forecast the production capacity and to determine the policy of developing technology. In this paper, by using the actual data of the Moxi area, the reservoir types of Moxi area are defined, and the production performance of different types of reservoirs are revealed. By using the integration of unconventional geological modelling and numerical simulation software Untog, the geological models which can reveal the geological characteristics of different types of reservoirs are established, and the numerical simulation study is carried out. The contribution of different media to the well production is revealed, the larger the pore size, the higher the recovery degree. Higher the proportion of large-scale pore, the higher the gas well production, and higher the well recovery.