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Previous issue date: 2011-02-08 / Cementing operations may occur at various stages of the life cycle of an oil well since
its construction until its definitive abandonment. There are some situations in which the
interest zones are depleted or have low fracture pressure. In such cases, the adoption of lowdensity
cement slurries is an efficient solution. To this end, there are basically three ways to
reduce the density of cement slurries: using microspheres, water extending additives or
foamed cement. The objective of this study is to formulate, to study and to characterize lowdensity
foamed cement, using an air entrainment surfactant with vermiculite or diatomite as
water extenders and stabilizers. The methodology consists on preparation and evaluation of
the slurries under the American Petroleum Institute (API) and the Brazilian Association of
Technical Standards (ABNT) guidelines. Based on calculated densities between 13 and 15
ppg (1.559 and 1.799 g/cm3), the slurries were prepared with fixed surfactant concentration,
varying the concentrations of vermiculite and diatomite and were compared with the base
slurries. The results of plastic viscosity, yield point and gel strength and the compressive
strength for 24 h showed that the slurries presented suitable rheology and mechanical strength
for cementing operations in oil wells, and had their densities reduced between 8.40 and 11.89
ppg (1.007 and 1.426 g/cm3). The conclusion is that is possible, under atmospheric conditions,
to obtain light weighted foamed cement slurries with satisfactory rheological and mechanical
properties by means of air entrainment and mineral additions with extenders and stabilizers
effects. The slurries have great potential for cementing operations; applicability in deep wells,
in low fracture gradient formations and in depleted zones and bring cost savings by reducing
the cementing consumption / As opera??es de cimenta??o podem ocorrer em diversas etapas do ciclo de vida de um
po?o, desde a sua constru??o at? seu abandono definitivo. H? situa??es em que as zonas de
interesse se apresentam depletadas ou com baixa press?o de fratura. Nesses casos, a ado??o de
pastas cimentantes de baixa densidade constitui solu??o eficiente. Para tanto, h? basicamente
tr?s maneiras de reduzir a densidade de pastas de cimento: usando microesferas, aditivos
estendedores de ?gua ou pastas espumadas. O objetivo deste trabalho ? formular, estudar e
caracterizar pastas cimentantes espumadas de baixa densidade, utilizando um surfactante
incorporador de ar juntamente com adi??es de vermiculita ou diatomita como estendedores e
estabilizantes. A metodologia do trabalho consiste na prepara??o e avalia??o das pastas por
meio de procedimentos adotados pelo American Petroleum Institute (API) e pela Associa??o
Brasileira de Normas T?cnicas (ABNT). Partindo de densidades calculadas entre 13 e 15
lb/gal (1,559 e 1,799 g/cm3), as pastas foram preparadas com dosagem fixa do surfactante,
variando as concentra??es de vermiculita e diatomita e foram comparadas com pastas base.
Os resultados dos ensaios que determinam viscosidade pl?stica, limite de escoamento e for?as
g?is, bem como os de resist?ncia ? compress?o para tempos de 24 h mostraram que as pastas
apresentaram reologia e resist?ncia mec?nica adequadas para opera??es de cimenta??o em
po?os de petr?leo, al?m de terem suas densidades reduzidas entre 8,40 e 11,89 lb/gal (1,007 e
1,426 g/cm3). Conclui-se que ? poss?vel, sob condi??es atmosf?ricas, obter pastas cimentantes
espumadas de baixa densidade com propriedades reol?gicas e mec?nicas satisfat?rias, por
meio de incorpora??o de ar e adi??es minerais com efeitos estendedores e estabilizantes. As
pastas possuem grande potencial para opera??es de cimenta??o, t?m aplicabilidade em po?os
profundos, forma??es de baixo gradiente de fratura e zonas depletadas e trazem redu??es de
custo pela diminui??o do consumo de cimento
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12969 |
| Date | 08 February 2011 |
| Creators | Lima, Marco Ant?nio Batista de |
| Contributors | CPF:15724520800, http://lattes.cnpq.br/0022988322449627, Melo, Dulce Maria de Ara?jo, CPF:06117988320, http://lattes.cnpq.br/3318871716111536, Freitas, J?lio Cezar de Oliveira, CPF:00957245408, http://lattes.cnpq.br/2357217530716519, Martinelli, Ant?nio Eduardo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia do Petr?leo, UFRN, BR, Pesquisa e Desenvolvimento em Ci?ncia e Engenharia de Petr?leo |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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