TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Researches on the Use of Metakaolin to Improve the Properties of Pastes Used in Oil Well Cementing
(Muzeul de Ştiinţe Naturale al Judeţului Prahova, Str. Erou Călin Cătălin, 1, Ploieşti e-mail: banumagdalena@yahoo.com)
Vol LX • No. 4/2008
Magdalena Banu
Muzeul de Ştiinţe Naturale al Judeţului Prahova, Str. Erou Călin Cătălin, 1, Ploieşti
e-mail: banumagdalena@yahoo.com

 Keywords   puzzolana, metakaolin, durability, compressive strength, initial and final set time, shrinkage

 Abstract
The introduction of Pozzolanic materials in the cement, as Supplementary cementitious materials (SCM), has become during the last few years a successful worldwide practice. It has been proved that these can react chemically with the hydrated cement, forming a modified microstructure of the paste, leading to the improvement of the cements properties with respect to the compressive strength, the durability and the behaviour in aggressive environments or at high temperatures.
In this study we have analysed the effect of adding metakaolin, in 10%-20% proportion, on the properties of the pastes that may be used in cementing oil wells. Four products of the metakaolin category have been used for testing, under the trade name of Power PozzTMHRM , MetaverTM R, MetaverTM W and Microsit® M10, manufactured by Advanced Cement Technologies USA and NewChem Switzerland. The researches made in the laboratory have studied the influence of such admixtures on the set time, on the spreading, density, compressive strength and shrinkage of the pastes achieved with such mixtures.

 Rezumat
Introducerea produselor de natură puzzolanică, ca materiale de înlocuire (SCM) în ciment, a devenit, în ultimii ani, o practică de succes pe plan mondial. S-a dovedit că acestea reacţionează chimic cu cimentul hidratat formând o microstructură modificată a pastei care conduce la îmbunătăţirea proprietăţilor lor în ceea ce priveşte rezistenţa la compresiune, durabilitatea şi comportarea în medii agresive sau la temperaturi ridicate.
În cadrul acestui studiu am analizat efectul adăugării metacaolinului, în proporţie de 10%-20%, asupra proprietăţile pastelor de ciment care pot fi folosite la cimentarea sondelor. Pentru testare s-au folosit patru produse din categoria metacaolinului, denumite comercial Power PozzTMHRM , MetaverTM R, MetaverTM W şi Microsit® M10, fabricate de către Advanced Cement Technologies USA şi NewChem Elveţia . Cercetările realizate în laborator au urmărit influenţa acestor adaosuri asupra timpului de priză, răspândirii, densităţii, rezistenţei la compresiune şi a contracţiei pastelor realizate cu astfel de mixturi.



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