Efeito da adição de poliuretana na permeabilidade de pastas leves com incorporador de ar
The cementing job has the purpose of sealing permeable zones and providing support for the casing column. Depleted reservoirs or with low fracture pressure require low-density cementitious slurries. Low-density or lightweight cement are also obtained through the incorporation of air by the use of...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25733 |
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| Resumo: | The cementing job has the purpose of sealing permeable zones and providing support for the
casing column. Depleted reservoirs or with low fracture pressure require low-density
cementitious slurries. Low-density or lightweight cement are also obtained through the
incorporation of air by the use of the air incorporating additive (IAR) and its application
contributes to the formation of closed pores incorporated throughout the cement slurry. The
polyurethane (PU) presents excellent results of fluid loss control, free water, permeability and
porosity, contributing to the reduction of gas migration through the cement sheath. The general
objective of this thesis is to evaluate the effect of the polyurethane addition on the lightweight
slurries permeability with air incorporator. The concentrations of the chosen developer were
based on the manufacturer's suggestion. From a calculated density of 15.6 lb/gal (1.87 g/cm3
) to
a standard slurry, slurries with air incorporator and polyurethane were prepared. The
experimental design used was the complete factorial 32, in which it was previously performed to
better evaluate the effects of the additives used. Density, stability, mechanical strength and
permeability tests were performed according to the requirements of the American Petroleum
Institute (API) and the Brazilian Association of Technical Standards (ABNT). A reduction in
slurry density was observed with increasing concentration of air incorporating additive. The
compressive strength decreased with the air incorporation, a fact that was already expected due
to the pores formation, but the values are compatible with lightweight slurries. The permeability
tests were satisfactory, presenting values below 0.1 mD for 28 days of cure. It was concluded
that it is feasible to use air incorporator together with polyurethane in low-density cement
slurries and that it is possible to obtain coherent results with low permeability and good
compressive strength for the conditions of formations with low fracture gradient. |
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