Efeito da adição de cargas minerais leves na resistência mecânica de grautes para cimentação de poços offshore
The preparation of cement slurries for offshore well cementing involves mixing all solid components to be added to the mixing water on the platform. The aim of this work was to study the formulation of pre-prepared dry mixtures, or grouts, for offshore oilwell cementing. The addition of mineral f...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/13013 |
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| Resumo: | The preparation of cement slurries for offshore well cementing involves mixing all solid
components to be added to the mixing water on the platform. The aim of this work was to
study the formulation of pre-prepared dry mixtures, or grouts, for offshore oilwell
cementing. The addition of mineral fillers in the strength of lightweight grouts applied for
depths down to 400 m under water depths of 500 m was investigated. Lightweight materials
and fine aggregates were selected. For the choice of starting materials, a study of the
pozzolanic activity of low-cost fillers such as porcelain tile residue, microsilica and
diatomaceous earth was carried out by X-ray diffraction and mechanical strength
tests. Hardened grouts containing porcelain tile residue and microsilica depicted high strength
at early ages. Based on such preliminary investigation, a study of the mechanical strength of
grouts with density 1.74 g/cm3 (14.5 lb/gal) cured initially at 27 °C was performed using
cement, microsilica, porcelain tile residue and an anti-foaming agent. The results showed that
the mixture containing 7% of porcelain tile residue and 7% of microsilica was the one with
the highest compressive strength after curing for 24 hours. This composition was chosen to be
studied and adapted for offshore conditions based on testes performed at 4 °C. The grout
containing cement, 7% of porcelain tile residue, 7% of active silica and admixtures (CaCl2),
anti-foaming and dispersant resulted satisfactory rheology and mechanical strength after
curing for 24 hours of curing |
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