Wellbore Gas Flow Pattern And Production Systems Analysis And Applications

This paper presents the basic concept of the production systematic analysis in gas well and the basic principle and method in nodal point analysis of the gas well: give the result of deepgoing analysis as well as research on the gas flow rule in the wellbore, performance relationships curve of inflow and outflow as well as the curve of pure gas wells and liquid production gas wells. On the basis of the conclusion on the various mathematic models which show the accurate calculation and approximate calculation of downhole pressure in conventional and water-bearing gaszones and in high pressure gaszones with high content of H2S, CO2 and the calculation program, mathematic models with the calculation method for nodal point analysis in gas production system, the author presents the new calculation method of differential pressure alternative calculation for the vertical pipe flow in condensate gas reservoir and the new method for accurate and approximate calculating of the downhole pressure in gas wells on the varies type of gas pool by gas column pressure in wellbore as well as well test method of non-closing well for determination main parameter of inflow performance curve. The paper analyzes the simulating and optimizing for the production system along with the factors of pay rate which are influenced by the tubing diameter in an individual well, gas gathering procedure and pressure in the separator and determines the analysis method for hydraulic performance under current circumstance. The paper has an instructive and application significance in optimizing productivity control determining the production status while stopping blowout and the best time for the gas well to artificial lift, therefore, enhancing the production rate and recovery efficiency.