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Previous issue date: 2014-12-29 / O teste de compatibilidade entre um fluido de perfura??o e uma pasta de cimento ? uma das
etapas que antecedem uma opera??o de cimenta??o de po?os de petr?leo. Este teste permite
avaliar os principais efeitos que uma contamina??o destes dois fluidos pode ocasionar as
propriedades tecnol?gicas de uma pasta de cimento. As intera??es entre uma pasta de cimento
e um fluido de perfura??o, devido suas diferentes composi??es qu?micas, podem comprometer
as rea??es de hidrata??o do cimento, prejudicando a opera??o de cimenta??o. Desta forma,
realizou-se o estudo da compatibilidade de um fluido de perfura??o n?o-aquoso e uma pasta de
cimento aditivada. Os procedimentos de prepara??o do fluido de perfura??o n?o-aquoso, da
pasta de cimento e de realiza??o do teste de compatibilidade foram realizados conforme
estabelecido por normas da ind?stria do petr?leo. Neste teste de compatibilidade avaliou-se as
propriedades reol?gicas, o tempo de espessamento, a estabilidade e a resist?ncia ? compress?o
das pastas de cimento. Realizou-se tamb?m an?lises de microscopia eletr?nica de varredura e
difra??o de raios X das misturas obtidas pelo teste de compatibilidade para se determinar as
modifica??es microestruturais nas pastas de cimento. O teste de compatibilidade n?o
apresentou mudan?as visuais nas propriedades da pasta de cimento, como a separa??o de fases.
Entretanto, ap?s a adi??o de fluido de perfura??o n?o-aquoso ? pasta de cimento houve um
aumento do valor da viscosidade pl?stica, do limite de escoamento e da for?a gel. Dentre os
principais fatores causadores pode-se citar: a rea??o qu?mica dos componentes presentes no
fluido de perfura??o n?o-aquoso, como o emulsificante prim?rio, o agente ?leo molhante e a
parafina, com os constituintes qu?micos do cimento. Houve uma redu??o da resist?ncia
mec?nica ? compress?o da pasta de cimento ap?s a mistura com este fluido de perfura??o. O
teste de espessamento demonstrou que o agente ?leo molhante e a alta salinidade do fluido n?oaquoso
possuem a??o aceleradora do tempo de pega da pasta de cimento. A estabilidade da
pasta de cimento ? prejudicada ? medida que ocorre o aumento da contamina??o da pasta de
cimento com o fluido n?o-aquoso. A difra??o de raios X identificou a forma??o da portlandita
e silicato de c?lcio nas amostras contaminadas. A microscopia eletr?nica de varredura
confirmou o desenvolvimento das estruturas identificadas na difra??o de raios X e constatou
tamb?m a presen?a de microcavidades na pasta de cimento curada. Estas ?ltimas, formadas pela
estabiliza??o da emuls?o do fluido de perfura??o na pasta de cimento, corroboram com ?
redu??o da resist?ncia mec?nica. O agente ?leo molhante, componente do fluido de perfura??o
n?o-aquoso, modificou os processos de hidrata??o do cimento, afetando principalmente o
tempo de pega / Compatibility testing between a drilling fluid and a cement slurry is one of the steps before an
operation of cementing oil wells. This test allows us to evaluate the main effects that
contamination of these two fluids may cause the technological properties of a cement paste.
The interactions between cement paste and drilling fluid, because its different chemical
compositions, may affect the cement hydration reactions, damaging the cementing operation.
Thus, we carried out the study of the compatibility of non-aqueous drilling fluid and a cement
slurry additives. The preparation procedures of the non-aqueous drilling fluid, the cement paste
and completion of compatibility testing were performed as set out by the oil industry standards.
In the compatibility test is evaluated rheological properties, thickening time, stability and
compressive strength of cement pastes. We also conducted analyzes of scanning electron
microscopy and X-ray diffraction of the mixture obtained by the compatibility test to determine
the microstructural changes in cement pastes. The compatibility test showed no visual changes
in the properties of the cement paste, as phase separation. However, after the addition of nonaqueous
drilling fluid to cement slurry there was an increased amount of plastic viscosity, the
yield point and gel strength. Among the major causative factors can include: chemical reaction
of the components present in the non-aqueous drilling fluid as the primary emulsifier, wetting
agent and paraffin oil, with the chemical constituents of the cement. There was a reduction in
the compressive strength of the cement paste after mixing with this drilling fluid. Thickening
test showed that the oil wetting agent and high salinity of the non-aqueous fluid have
accelerating action of the handle of the cement paste time. The stability of the cement paste is
impaired to the extent that there is increased contamination of the cement slurry with the nonaqueous
fluid. The X-ray diffraction identified the formation of portlandite and calcium silicate
in contaminated samples. The scanning electron microscopy confirmed the development of the
identified structures in the X-ray diffraction and also found the presence of wells in the cured
cement paste. The latter, formed by the emulsion stability of the drilling fluid in the cement
paste, corroborate the reduction of mechanical strength. The oil wetting agent component of the
non-aqueous drilling fluid, the modified cement hydration processes, mainly affecting the
setting time.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19670 |
| Date | 29 December 2014 |
| Creators | Soares, Angelo Ara?jo |
| Contributors | 00957245408, http://lattes.cnpq.br/2357217530716519, Neto, Alcides de Oliveira Wanderley, 00738841463, http://lattes.cnpq.br/4789528535524269, Garnica, Alfredo Ismael Curbelo, 05227790779, http://lattes.cnpq.br/0257037690238235, Braga, Renata Martins, 05165674460, http://lattes.cnpq.br/4603529162393328, Melo, Dulce Maria de Ara?jo, Freitas, J?lio Cezar de Oliveira |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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