Research on Calculation Method of Annular Leakage Rate based on Variable Conservation Method

Abstract

The annular leakage rate is the most important parameter to measure the failure of gas well barrier units. At present, there are two methods that can be applied to calculate the leakage rate of offshore gas wells: safety valve method and nozzle flow method. However, applying these two methods to the calculation of annular leakage rate has encountered a problem of poor adaptability. In order to enhance the accuracy of leakage rate calculation results and improve the reliability of judging gas well integrity through annular leakage rate, this article summarizes an annular rate calculation method based on variable conservation method.