Hydrated bentonite plugs may be used as barrier elements in plug and abandonment operations of petroleum wells. To this end, the way applied to dislocate the pellets inside the well is different for onshore and offshore wells. This study aims to evaluate how the operational procedure adopted for the pellets placement in the well and the exposure to subsurface conditions influences the mechanical integrity of hydrated plugs. Two methodologies were used to obtain the plugs: from the first methodology, the pellets were immersed in diesel or olefin, which are proposed as displacement fluids in offshore operations, and then, hydrated in deionized water; in the second methodology, representative of onshore operations, the pellets were directly hydrated in deionized water. After that, the plugs were tested by compression and adhesion tests. These mechanical tests were also carried out for test specimens obtained from plugs exposed to four formulations of synthetic formation waters. The results obtained demonstrated that the previous contact with olefin adversely affects the mechanical stability of bentonite plugs, while plugs formed from pellets immersed in diesel presented satisfactory mechanical properties. For plugs directly hydrated in deionized water, following the methodology proposed for onshore wells, the mechanical properties have demonstrated a highly successful performance of these elements, once its compressive strength was minimally impacted by exposure to formation waters and more pronounced reductions were observed only in the adhesion properties after the contact with higher salinity formation waters.
Author
(s) Details
Laura Rafaela
Cavalcanti de Oliveira
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.
Mário César de
Siqueira Lima
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.
Waleska Rodrigues
Pontes da Costa
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.
Ruth Luna do
Nascimento Gonçalves
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.
Anna Carolina Amorim
Costa
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.
Karine Castro Nóbrega
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.
Renalle Cristina
Alves de Medeiros Nascimento
Unidade Acadêmica de Santo Agostinho, Universidade Federal Rural de
Pernambuco (UFRPE), Rua Cento e
Sessenta e Três, 300, Garapu, Cabo de Santo Agostinho 54518-430, PE, Brazil.
Elessandre Alves de
Souza
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.
Tiago Almeida de
Oliveira
Departamento de Estatística, Universidade Estadual da Paraíba, Rua
Baraúnas, 351, Bairro Universitário, Campina Grande 58429-500, PB, Brazil.
Michelli Barros
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.
Luciana Viana Amorim
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.
Please see the book here:- https://doi.org/10.9734/bpi/stda/v7/4706
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