Thermal Shock Transient Analysis for Well Integrity Through Operational Envelope
- Cristiano Eduardo Agostini (PETROBRAS) | Nelson Moreira Júnior (PETROBRAS) | Cleidilson Moura dos Santos (PETROBRAS) | Roger Savoldi Roman (PETROBRAS) | Eduardo Schnitzler (PETROBRAS) | Marcus Vinicius Duarte Ferreira (PETROBRAS) | Charlton Okama de Souza (PETROBRAS) | Marcos Correa Weidlich (PETROBRAS) | Alan Pinheiro Silva (PETROBRAS)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 4-7 May, Houston, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2020. Offshore Technology Conference
- Integrity, Collapse, Wellhead, Thermal, Casing
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- 63 since 2007
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A physical evidence of an injector well failure caused by transient thermal behavior in cooling operations has lead to technical actions in order to provide a safe operational envelope. A modified thermal analysis was developed to predict the transient thermal behavior that can result in a cascade casing collapse. The as built approach was applied in a number of wells already constructed in a Brazilian offshore field resulting in a better way for selecting which mitigation method can be appropriate for each case. One of the main results from the study was to establish a controlled injection flow rate in order to avoid a cascade casing collapse due to thermal shock in the wellbore. In some cases, it was necessary to provide an annulus pressure communication in the wellhead using a ROV for bleeding off the excessive pressure in C annulus. With these actions, the wells studied were able to present a safe operational envelope. The approach commonly employed in the industry takes into account just steady state injection operations, which are not enough to describe what is happening in the field and also are not sufficient to support a suitable casing design. The industry must put efforts to develop and consolidate a methodology based on transient thermal analysis to deal with thermal shock events in the well, as proposed in this paper. Furthermore, this work also proposes four alternatives to mitigate the well integrity loss based on the transient thermal simulations and a comprehensive well risk assessement.
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Agostini, C.E.,Almeida, L.F.M.,Moreira, N.,JrMagalhães, M.D.,Roman, R.S.,Schnitzler, E.,Silva, A.P. 2019. Salt Creeping Analysis on Deepwater Wells Submitted to Cooling Operations on Trapped Annular. OTC-29764-MS. Offshore Technology Conference Brasil, 29-31 October, Rio de Janeiro, Brazil. https://doi.org/10.4043/29764-MS.
Jandhyala, S.,Barhate Y.R.,Anjos J.,Fonseca C.E.,Ravi, K. 2013. Cement Sheath Integrity in Fast Creeping Salts: Effect of Well Operations. Paper SPE/IADC 166622 presented at the SPE Offshore Europe Oil and Gas Conference and Exhibition, Aberdeen, UK, 3–6 September. https://doi.org/10.2118/166622-MS.
Moreira, N.,JrAgostini, C.E.,Santos, C.M.,Roman, R.S.,Schnitzler, E.,Magalhães, M.D.,Ferreira, M.V.D.,Souza,C.O. 2019. Structural Analysis of Thermal Behavior On Cooling Trapped Annular Pressure In Water and Gas Injection Wells. OTC-29832-MS. Offshore Technology Conference Brasil, 29-31 October, Rio de Janeiro, Brazil. https://doi.org/10.4043/29832-MS.
Poiate,E.,Jr.Costa, A.M., and Falcao, J.L. 2006. Well Design for Drilling Through Thick Evaporite Layers in Santos Basin–Brazil. Paper IADC/SPE 99161 presented at the IADC/SPE Drilling Conference, Miami, Florida, USA, 21–23 February. http://dx.doi.org/10.2118/99161-MS.
Sultan, N.,Faget, J.P.,Fjeldheim M.,Sinet, J.C. 2008. Real-Time Casing Annulus Pressure Monitoring in a Subsea HPHT Exploration Well. Paper OTC 19286 presented at the Offshore Technology Conference, Houston, USA, 5–8 May. https://doi.org/10.4043/19286-MS.