Law Of Gas Effusion And Optimization Of Drainage Gas

Drainage gas is an effective measure to solve the gas downhole fluid, restore gas production capacity, it is quick, wide range of applications. Most of the domestic gas fields due to years of exploitation, many wells have begun producing water, the situation appeared downhole fluid, and even some wells have been flooded discontinued. This situation has seriously affected the production of gas for processing different geology wells, which use what method to improve drainage gas recovery and economic benefits, are technical problems in recent years has yet to be resolved.Based on the fluid drainage gas downhole technology status and research, through the downhole fluid analysis to calculate the height and effusion fluid cycle. The use of multiphase flow to fit within the wellbore pressure gradient, to gas-liquid two mixed output measurement purposes. Calculation of the amount of water in the formation, citing the gas-liquid two-phase relative permeability curves of water saturation corresponding gas-water ratio to determine the maximum water saturation. Sulige gas field has been adopted by the drainage gas recovery technology research, the establishment of a preferred column plunger gas lift, gas lift foam drainage gas drainage gas model to optimize the design of the drainage gas recovery methods. The main results are as follows:In determining fluid situation, using the method of critical velocity and kinetic energy factor method to analyze whether there downhole fluid build momentum factor calculation model by comparing model calculations and post-processing to determine the scope of the kinetic energy factor when gas effusion;For fluid wells, a mathematical model to calculate the differential pressure method sets oil downhole fluid height;Depending on the pressure with a projected future gas reservoir formation pressure, calculate the critical gas production under future formation pressure, fluid cycle to calculate it;According to the calculation of multiphase flow tube to fit the measured pressure and temperature gradients, a mathematical model to calculate the amount of water out of the wellbore;Application of gas-liquid two-phase relative permeability curves Find the gas-liquid ratio, calculated from different water saturation corresponding gas production, calculate the maximum water saturation using linear regression;When designing drainage gas model, comparative advantages and disadvantages of the scope of each drainage gas, drainage gas commonly used method of full understanding, you can also combine practical experience in the field of production, choice of several drainage gas recovery methods comparative analysis, preferably a relatively efficient, energy-saving, high economic efficiency of the method;Using Visual Basic language, based on the above design model, and preparation of a downhole fluid drainage gas optimized design software.