Study On Production Analysis Method Of Downhole Junction Gas Well

Downhole choking technology in gas wells not only can step-down the pressure of the gas wells and product safely but also can reduce gas field development costs. But after a downhole has been choked,the wellhead and bortomhole pressure natural link would be blocked naturally.Under such conditions,in order to analyze the status of entire gas production scientifically under different conditions and determine a reasonable capacity and a optimum system,we should to consider the fluid flow characteristics of gas reservoir and based on the wellbore to changes in flow and pressure.The purpose of this paper is to analysis the production performance of the high pressure gas well which adoptes downhole throttling gas technology and gas reservoir seepage and shaft coupling with steady state conditions under the conditions of transient gas reservoir percolation and coupling. The main work accomplished in this paper as follows.Firstly, in order to predict wellbore non-linear temperature field and the related thermodynamics parameters, wellbore temperature field model is established; Consider downhole throttling and formation heat transfer effect, wellbore flow model is established.Secondly, for fractured well, horizontal well we establish the percolation mathematical model separately as a prediction of inflow performance of gas well.Thirdly, through contrast the differences of gas reservoir numerical simulation of single well, and analysis the applicable conditions of traditional pseudopressure method, we proposed non-linear approximation method which based on mass balance constraints and consider the formation pressure drop of fluid flow effects and improved the gas reservoir dynamic analysis of theoretical models and bottom hole pressure and average formation pressure prediction precision.Fourthly, the wellbore flow and gas flow as a whole, considering the particularity of wellbore flow under the condition of throttling, gas well dynamic analysis model is established.Based on the above research results, this paper finally to analysis the status of the gas wells’s production of X gas reservoir gas well which adopt downhole throttling technology, formed the Blasingame diagnosis flow curves, casing pressure and typical curve fitting at the same time, and draw the conclusion.