Research on Annular Pressure Buildup in Deepwater Oil and Gas Well

摘要

Accurate prediction of the annular pressure buildup in deepwater oil and gas well is of great significance for drilling and production of oil and gas. In order to predict the annular pressure buildup, casing annulus temperature distribution is calculated by considering the deep water well structure and wellbore heat transfer process. And the prediction model of annular pressure buildup is established. Newton down-hill method is used to solve the model. The reliability of the model is validated by comparing predicted results of the model with monitoring values in the oil field. The results indicate that the predicted results are in good agreement with monitoring values of casing annular temperature and pressure, and the max relative error is less than 10%. The accuracy can meet the needs of engineering. In addition, compared with the simple iterative method, computing speed of the Newton down-hill method is relatively faster. In words, the model can provide theoretical guidance for the accurate calculation of annular pressure buildup.