Abstract

Annular pressure buildup (APB), caused by fluid thermal expansion in confined annuli of high temperature (HT) subsea wells, can lead to some serious accidents such as casing failure or tubing collapse, especially during the starting production within hours. Thermal expansion in the sealed annulus contributes to more than 80% of APB. To predict annular temperature accurately is the key to calculate APB. This paper presents a semi-steady state model to predict multi-annular temperature. The new model presented not only taking the amount of annuli difference in various depths into account but also the friction energy effects of formation fluid flowing in the tubing. The simulation result describes the temperature distribution in various depths of different annulus. The simulation results show that the temperature increase in the multi-annuli can be as high as 30°C on an average.

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