Study on Hydrate Formation in Deep-Water Gas Well Intervention Operation

Abstract

In the development of deepwater high temperature and pressure gas wells, frequent intervention operations are required. Wellbores near the seabed have the risk of producing massive hydrates and plugging the wellbore. Based on the non-steady state model, a temperature-pressure coupling model of deepwater gas well intervention was established, and a physical simulation experiment of hydrate formation under deepwater gas well intervention was carried out by using the self-developed hydrate deposition simulation reaction device. Intervention operation of deepwater high temperature and high pressure gas wells. With reference to the test data of a real well in the South China Sea, the hydrate formation rate was analyzed under the influence of different production rates, running speed and tool size, temperature and pressure distribution of deepwater gas wells. The operation rules of deepwater gas well intervention and the formation rules of hydrates are obtained. Simulation prediction results can be used to predict the timing and location of hydrate plugging under intervention operations.