Study On Calculation Method Of Water Influx And Reserves Of Water And Gas Reservoirs In Yingcheng Formation

Most of the gas reservoirs that have been developed in China are affected by different degrees of water intrusion and lead to a significant reduction in gas reservoir recovery.Therefore,it is necessary to accurately calculate the geological reserves of water reservoirs in order to facilitate the adjustment of the gas reservoir development plan.Or redeploy.Based on a large number of domestic and foreign literature research,it is found that the reliability of the calculation of geological reserves of water and gas reservoirs is closely related to the accuracy of the calculation results of water influx.Therefore,this paper proposes a new method for calculating the water influx and geological reserves of water and gas reservoirs.Improve the accuracy of calculation results and efficiently develop water and gas reservoirs.This paper mainly analyzes the applicability of several conventional water-gas reservoir dynamic geological reserves and water influx calculation methods,and establishes an objective function based on continuous test of formation pressure data and various conventional methods,and uses the new method to the city.The multi-port water-gas wells with fractured water and gas reservoirs are used to calculate the single-well geological reserves and water influx,and compared with the settlement results of conventional methods.The integrated method and the plate combination method can improve the accuracy of the calculation results.Considering the actual production,in order to save costs and minimize the number of shut-in times of water-producing gas wells,it is impossible to obtain continuous monitoring of formation pressure data in a single well.Therefore,a modified production binomial production capacity based on a few formation pressure data is established.The inverse algoritlun predicts the geological reserves and water influx of water gas reservoirs.The gas-water two-phase permeability of the water-producing gas well is mainly considered in the binomial productivity equation of the dry gas well,and the material equilibrium equation is used to calculate the average water saturation to determine the binomial coefficient,and the objective function of the fonmation pressure is established respectively.The objective function of the water content is fitted,and finally the single well dynamic reserves and water production in the water gas reservoir are obtained.Applying the new method to high-water-containing gas wells directly fits the daily data of daily water production,and accurately calculates the geological reserves and water intrusion of single wells when the formation pressure data is small.Through comparative analysis of various calculation methods,the new method is more reliable and on-site applicability than conventional methods.Therefore,the new method can be applied to fractured water-bearing gas reservoirs and other types of water intrusion gas reservoirs.