Study On Integrated Dynamic Simulation Model Of Gas Reservoir And Wellbore

Sulige gas wells are generally faced with the problem of liquid loading,liquid loading is a dynamically changing process,which will greatly affect the production of gas wells,and also makes it difficult to simulate the production dynamics of a gas well.No matter from the perspective of reservoir or wellbore,the problem of liquid loading cannot be comprehensively described.Therefore,it is of great practical significance to establish an integrated dynamic simulation model of gas reservoir and wellbore.In this paper,the fully implicit method is used to solve the gas-water two-phase black oil model,which ensures the accuracy of the parameters calculation near the wellbore.At the same time,the liquid loading process was discussed comprehensively,then a single-well wellbore simulation model considering gas-liquid two-phase flow,additional pressure drop caused by fluid accumulation and drainage gas recovery technology was established.Finally,the semi-implicit coupling method was used to couple the gas reservoir model with the wellbore model,and a gas reservoir-wellbore integrated dynamic simulation model was established.Based on the theoretical model,this article compiles a reservoir-wellbore integrated dynamic simulation software,and validates the model by comparing the software simulation results with actual gas well production data.the results show that the integrated dynamic simulation model presented in this paper is significantly better than the conventional numerical simulation method for the simulation of gas well production performance in the whole life cycle.At the same time,this paper uses the software to simulate the production dynamics of a gas well after the drainage gas recovery process is applied.In combination with the net present value analysis method,a method for judging the optimal drainage gas recovery process for a gas well and the optimal application timing of the drainage gas recovery process are proposed.This study has certain guiding significance for the design of drainage gas recovery technology for liquid loading wells.