Delivery and Sensitivity Analysis during the Initial Production of Gas Wells

Abstract Accurately evaluating the production deliverability of gas wells helps to understand the overall resource potential of a gas reservoir and to optimize production, which is of far-reaching significance in ensuring the sustainable development and utilization of natural gas resources. Conventional well testing methods, which require obtaining stable production rates and corresponding bottomhole flow pressures in the working regime, are not suitable for gas wells where only short blowout and shut-in data are available in the early stages of well construction. The empirical formulas established on the basis of the factors influencing the production deliverability of gas wells are not universally applicable. The deliverability equations for different gas reservoir types were established based on the seepage model during the early blowout of gas wells. The time of stabilization of the absolute open flow (AOF) under different factors was analyzed to determine the main controlling factors of the early production deliverability of gas reservoir establishment. Validated by the data of example wells in deep carbonate reservoirs, the calculated results of the newly established deliverability equation have an error of less than 5% from the theoretical binomial deliverability, which is of some reference significance for determining the initial deliverability of gas wells.