Research on Water Invasion Mode and Water Control Counter Measures of Geological MX Gas Reservoir

Abstract

The MX gas reservoir is a typical carbonate gas reservoir and there are three types of water production characteristics in producing wells during the development process: fast rising type, slow rising type and stable type. The overall water invasion mode is dominated by the edge water invasion mode, with four types of water invasion modes including bottom water cone type, edge water finger type, edge water tongue type and native movable water tongue type. In this paper, numerical simulation techniques are used to investigate water management countermeasures for MX gas reservoirs based on the dynamic identification of water invasion. The results show that, after optimisation of the drainage and water control plans, the gas reservoir can produce steadily until the end of 2025 at a recovery rate of 3.06%, extending the time of steady production by about 9 months. In view of the relatively uniform advancement of fracture water channel and edge water into the interior of the gas reservoir, it is feasible to adopt active drainage and edge water control measures respectively to reduce the risk of water intrusion in the gas reservoir and ensure stable gas production.