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. Processes2023, 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.
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. Processes2023, 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.
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