Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evaluation of Saline Solutions and Organic Compounds as Displacement Fluids of Bentonite Pellets for Application on Abandonment of Offshore Wells

Waleska Rodrigues Pontes da Costa
* ORCID logo ,
Laura Rafaela Cavalcanti de Oliveira
,
Karine Castro Nóbrega
,
Anna Carolina Amorim Costa
,
Ruth Luna do Nascimento Gonçalves
,
Mário César de Siqueira Lima
,
Renalle Cristina Alves de Medeiros Nascimento
,
Elessandre Alves de Souza
,
Tiago Almeida de Oliveira
,
Michelli Barros
,
Luciana Viana Amorim
Version 1 : Received: 8 October 2023 / Approved: 9 October 2023 / Online: 9 October 2023 (11:07:02 CEST)

A peer-reviewed article of this Preprint also exists.

Costa, W.R.P.; Oliveira, L.R.C.; Nóbrega, K.C.; Costa, A.C.A.; Gonçalves, R.L.N.; Lima, M.C.S.; Nascimento, R.C.A.M.; Souza, E.A.; Oliveira, T.A.; Barros, M.; Amorim, L.V. Evaluation of Saline Solutions and Organic Compounds as Displacement Fluids of Bentonite Pellets for Application in Abandonment of Offshore Wells. Processes 2023, 11, 3375. Costa, W.R.P.; Oliveira, L.R.C.; Nóbrega, K.C.; Costa, A.C.A.; Gonçalves, R.L.N.; Lima, M.C.S.; Nascimento, R.C.A.M.; Souza, E.A.; Oliveira, T.A.; Barros, M.; Amorim, L.V. Evaluation of Saline Solutions and Organic Compounds as Displacement Fluids of Bentonite Pellets for Application in Abandonment of Offshore Wells. Processes 2023, 11, 3375.

Abstract

One of the operational challenges for the use of bentonite pellets as a sealing material in the abandonment of offshore fields consists in their disposition inside the well. This study aims to analyze the interaction of fluid media, consisting of saline solutions (NaCl, CaCl2 and KCl) and organic compounds (diesel, glycerin and olefin), with bentonite pellets, aiming its application as displacement fluid in offshore oil well abandonment operations. The physical integrity of the bentonite pellets in contact with the fluids was verified through visual inspections and dispersibility tests. Linear swelling tests were also performed to evaluate the potential for swelling of pellets in deionized water after contact with the fluid media. The results indicated that NaCl, CaCl2 and KCl solutions completely compromise the physical integrity of the pellets, while diesel and olefin showed the best responses regarding the structural preservation. Futhermore, the linear swelling tests showed that, even after the contact with diesel and olefin for 1 hour, bentonite pellets have reached a total swelling in water of 78%, after 24 hours. In this way, diesel and olefin proved to be highly promising alternatives to be used as displacement fluids for bentonite pellets in wells to be abandoned in a submarine environment.

Keywords

compacted clay; clay swelling; physical integrity; displacement fluid; solids transportation

Subject

Engineering, Other

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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