Water Production Regularity And Productivity Evaluation Of Carbonate Gas Reservoirs

The Mawu 5 gas reservoir in the south of Sulige is a typical carbonate gas reservoir.This paper takes the Ma 5 5 gas reservoir as the research object.Based on the analysis of the geological characteristics of the gas reservoir,the single well gas is studied through well logging data.The distribution characteristics of the layer and the water layer in the longitudinal direction are used to establish the gas-water layer identification standard,and the three-dimensional geological modeling of the study area is used to analyze the distribution characteristics of the gas layer and the water layer.Secondly,the production dynamic data of 127 gas production wells in the research area were analyzed.Through two-factor analysis,the production wells were divided into three types of wells: Class I production wells: good reservoir properties,high single well production,and stable production.Capacity,class II production wells: physical properties are more general,single wells have a certain output,but often fluctuate,class III production wells: poor physical properties,not much gas production,single well production is low.On the basis of dynamic analysis,the study of the law of water discharge is carried out,and various methods for water source identification are proposed.The source of water is specified for typical wells of different effluent types,mainly the primary movable water in the layer;the comprehensive analysis of gas reservoirs is carried out.The characteristics of water intrusion were calculated by various methods,and the water intrusion was calculated.The water intrusion mechanism of gas wells was further studied.The main mechanisms of water intrusion were coexisting water weak water intrusion and crack water.Finally,through the screening of suitable gas-water two-phase percolation model,the productivity of high-yield water-gas wells is evaluated,and the influence law of gas-water ratio on production capacity is obtained.On this basis,the reasonable yield of single wells is studied,which is implemented for the later water control measures.Development adjustment provides the basis.