Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Parametric Analysis of the Annular Pressure Change Mitigation with Rupture Disks
Submission Author:
Ianto Martins , SC
Co-Authors:
Ianto Martins, Jader Riso Barbosa Jr.
Presenter: Jader Riso Barbosa Jr.
doi://10.26678/ABCM.COBEM2023.COB2023-1175
Abstract
Offshore petroleum production occurs in subsea reservoirs which usually operate at high pressure and temperature conditions. Injection of fluids in the reservoir causes temperature variations in the fluids trapped in the annular layers adjacent to the injection tubing, hence, a pressure increase in these annular cavities is expected. Several mitigation procedures and devices have been developed to mitigate this pressure variations, which can be achieved by reducing the heat exchanged with the injection fluid, employing fluids with special properties, or enabling fluids’ movement across the annuli. The latter involves using devices known as rupture disks, which are placed between adjacent annuli and after a sufficiently high pressure difference between the layers is attained it opens and fluid flows between layers according to the negative pressure difference. The present work employed a semi-transient uni-dimensional thermo-structural model to calculate the temperature distribution of all wellbore components; the mass transferred between adjacent annuli was calculated with a previously developed model based on a dynamic time mesh refinement based on the physics of the phenomena. An offshore well located in a Brazilian oilfield was used on the simulations, with its fluid components thermophysical properties dependence upon their thermodynamic state being considered. All the results were evaluated with a parameter based on the pressure difference across the casing; this parameter can be evaluated as a casing failure probability, with values higher than 1 being considered as a significant risk. The present study consists on over 200 simulations which focused on two different aspects: the disk configuration (installation depth, opening load, radius) and parameter operations (inlet temperature and injection rate). The results indicated that no parameter regarding the disk configuration has any influence on the structural results. As for the injection parameters, the inlet temperature had more influence on the maximum values at the end of the simulation while the inlet flow rate controlled the growth rate of the inter-annular pressure difference and the disk opening time, respectively.
Keywords
wellbore heat transfer, welbore failure, rupture disk, pressure mitigation, annular pressure change
