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10.3390/resources13080103
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Article

Mechanical Performance of Bentonite Plugs in Abandonment Operations of Petroleum Wells

by
Laura Rafaela Cavalcanti de Oliveira
1,
Mário César de Siqueira Lima
1,
Waleska Rodrigues Pontes da Costa
1,*,
Ruth Luna do Nascimento Gonçalves
1,
Anna Carolina Amorim Costa
1,
Karine Castro Nóbrega
1,
Elessandre Alves de Souza
2 and
Luciana Viana Amorim
1
1
Unidade Acadêmica de Engenharia de Petróleo/Unidade Acadêmica de Estatística, Universidade Federal de Campina Grande (UFCG), Rua Aprigio Veloso, 882, Bairro Universitário, Campina Grande 58429-900, PB, Brazil
2
Centro de Pesquisas Leopoldo Américo Miguez de Mello (CENPES), PETROBRAS (Petróleo Brasileiro S.A.), Avenida Horacio Macedo, 250, Cidade Universitária, Rio de Janeiro 21941-915, RJ, Brazil
*
Author to whom correspondence should be addressed.
Resources 2024, 13(8), 103; https://doi.org/10.3390/resources13080103
Submission received: 23 May 2024 / Revised: 4 July 2024 / Accepted: 18 July 2024 / Published: 23 July 2024
(This article belongs to the Topic Petroleum and Gas Engineering)
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Abstract

This study aims to evaluate how the operational procedure adopted for pellet placement and the exposure to subsurface conditions influence the mechanical integrity of bentonite plugs used as barrier elements in the abandonment of petroleum wells. To this end, the plugs were formed by hydrating the pellets directly in water, simulating the onshore procedure, while the offshore plugs were obtained from pellets hydrated in deionized water after immersion in diesel or olefin, which are suggested as displacement fluids. The plugs obtained were tested by compression and adhesion tests. These mechanical tests were also carried out for specimens obtained from plugs exposed to four formulations of synthetic formation waters. The results obtained demonstrated that, in the offshore procedure, the previous contact with olefin may adversely affects the mechanical stability of bentonite plugs, while plugs formed from pellets immersed in diesel presented satisfactory mechanical properties. However, the contact with formation water evidenced that the onshore plug presents superior resistance than the offshore plug previously immersed in diesel. The highly successful performance of the onshore plug was attested by the maintenance of the compressive strength, which exhibited a maximum reduction of 13%, even after exposure to the most saline formation waters.
Keywords: decommissioning; abandonment; sealing material; bentonite pellets; displacement fluids; formation water decommissioning; abandonment; sealing material; bentonite pellets; displacement fluids; formation water

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MDPI and ACS Style

Oliveira, L.R.C.d.; Lima, M.C.d.S.; Costa, W.R.P.d.; Gonçalves, R.L.d.N.; Costa, A.C.A.; Nóbrega, K.C.; Souza, E.A.d.; Amorim, L.V. Mechanical Performance of Bentonite Plugs in Abandonment Operations of Petroleum Wells. Resources 2024, 13, 103. https://doi.org/10.3390/resources13080103

AMA Style

Oliveira LRCd, Lima MCdS, Costa WRPd, Gonçalves RLdN, Costa ACA, Nóbrega KC, Souza EAd, Amorim LV. Mechanical Performance of Bentonite Plugs in Abandonment Operations of Petroleum Wells. Resources. 2024; 13(8):103. https://doi.org/10.3390/resources13080103

Chicago/Turabian Style

Oliveira, Laura Rafaela Cavalcanti de, Mário César de Siqueira Lima, Waleska Rodrigues Pontes da Costa, Ruth Luna do Nascimento Gonçalves, Anna Carolina Amorim Costa, Karine Castro Nóbrega, Elessandre Alves de Souza, and Luciana Viana Amorim. 2024. "Mechanical Performance of Bentonite Plugs in Abandonment Operations of Petroleum Wells" Resources 13, no. 8: 103. https://doi.org/10.3390/resources13080103

APA Style

Oliveira, L. R. C. d., Lima, M. C. d. S., Costa, W. R. P. d., Gonçalves, R. L. d. N., Costa, A. C. A., Nóbrega, K. C., Souza, E. A. d., & Amorim, L. V. (2024). Mechanical Performance of Bentonite Plugs in Abandonment Operations of Petroleum Wells. Resources, 13(8), 103. https://doi.org/10.3390/resources13080103

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