doctoralThesis
Influência da vermiculita expandida na formulação de pastas leves para evitar a migração de gás em cimentação de poços petrolíferos
Fecha
2014-02-10Registro en:
NUNES, Eduardo Raimundo Dias. Influência da vermiculita expandida na formulação de pastas leves para evitar a migração de gás em cimentação de poços petrolíferos. 2014. 101 f. Tese (Doutorado em Processamento de Materiais a partir do Pó; Polímeros e Compósitos; Processamento de Materiais a part) - Universidade Federal do Rio Grande do Norte, Natal, 2014.
Autor
Nunes, Eduardo Raimundo Dias
Resumen
The gas migration during the cementing of wells is one of the main problems of oil wells
engineering. Its occurrence can cause severe problems since shortly to loss of control of the well after
cementation. Recently, 20/04/2010 In an accident of major proportions in the Gulf of Mexico, among
other factors, faulty cementing operation provided the gas migration, causing the accident, in which 11
people died and 17 were injured occurred. Besides the serious consequences that can be caused by
gas migration, remediation of the problem, which is made by injecting cement in damaged areas,
usually involves additional costs and is not always effective. Therefore, preventing gas migration to be
preferred. Some methods are used to prevent the migration of the pressurized gas as the annular
space, application of pressure pulses, reducing the height of the cement column compressible cement
pastes of low permeability, pastes and to control free filtered water, and binders of thixotropic cement
expandable and flexible. Thus, the cement pastes used to prevent gas migration must meet the
maximum these methods. Thus, this study aimed to formulate a cement paste to prevent gas
migration, using the expanded vermiculite, and evaluate the behavior of the folder trials necessary for
use in oil wells. Free water content, rheological properties, compressive strength, loss of liquid phase
sedimentation of solids, specific weight, thickening time and gas migration: The following tests were
performed. The results show that meets the specifications paste formulated for use in oil wells and the
use of expanded vermiculite contribute to the absorption of free water, thixotropy and low density. The
absorption of free water is proven to result in zero percentage test free water content, thixotropy is
observed with the high value of the initial gel strength (Gi) in testing rheological properties and low
density is proven in test weight specific