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Improving the Flexural Strength of Fibre Reinforced Oil Well Cementsby Addition of a Polymer Latex

Published online by Cambridge University Press:  21 February 2011

Demosthenis G. Pafitis
Demosthenis G. Pafitis*
Affiliation:
Schlumberger Cambridge Research Limited, High Cross, Madingley Road, Cambridge, CB3 OEL, United Kingdom
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Abstract

Fibre-reinforced cements are proving to be useful in various oilfield applications. Low cost and increased toughness render glass fibre reinforced cements of particular interest. In most cases, improvements in toughness are the result of extensive fibre pull-out and this can be clearly observed in electron micrographs of fracture surfaces. This observation implies that there is much scope for improving the interfacial shear strength between the hydrated cement and glass fibres.Experiments have shown that increases in flexural strength and in energy to fracture can be achieved by incorporating small amounts of a polymer latex. Improvements of a factor of four in energy to fracture have been measured when approximately 0.8% by volume of a styrenebutadiene copolymer latex is added to a glass fibre reinforced class G oilwell cement. Experimental results suggest that this effect is not due to improvements in the strength of the cement matrix but due to an enhancement of the interfacial shear strength between fibre and cement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 370: Symposia Va/Vb – Microstructure of Cement-Based Systems/Bonding and Interfaces in Cement... , 1994 , 565
Copyright
Copyright © Materials Research Society 1995

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