摘要：Mining area A of a gas field in Central Asia has adopted the strategy of oil and gas exploration in advance, which has led to a significant decrease in fonnation pressure in mining area B. Furthermore, the pressure drop of mining area B leads to the complex technical problems of gas spillage, reserves reduction, gas well production reduction and even off production. It has seriously affected the overall resource exploration and development efficiency of this gas field. In this paper, based on the reserve calculation of volume method and the material balance formula of gas reservoir, a novel numerical model considering gas spillage was established by using numerical simulation method. By simulating the different recovery amount of mining area A, the gas spillage and pressure distribution of mining area B are determined. The pressurization time, pressurization mode and reasonable production of gas well are optimized to improve the oil recovery of gas field after pressure drop in mining area B. The results show that this method fits the pressure change and pressure distribution of mining area B. The gas spillage accounts for 38.6% of the original geological reserves. The gas field recovery rate of the pressurized plan can be increased from 16.05% to 35.68%. The net economic increment is 7.01 times of the total investment. The benefits are significant.
关键词：Numerical simulation; gas spillage; pressurization time; pressurization method; gas field recovery factor
