Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-19T05:59:56.896Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Specification for Materials and Testing of Well Cements. API Specification 10, Fifth edition, July (1990).Google Scholar
[2] Dennis, R., in Construction Materials Reference Book, edited by. Doran, D.K., (Butterworth Heinemann, 1992.), p. 39/1.Google Scholar
[3] Isenburg, J.E., Vanderhoff, J.W., Hypothesis for reinforcement of portland cement by polymer latexes. Journal of the American Ceramics Society. 57, no. 5, pp. 242–245.Google Scholar
[4] Lavelle, J.A., Acrylic Latex-modified portland cement. ACI Materials journal, Jan- Feb (1988).Google Scholar
[5] Nakayama, M., Beaudoin, J.J., Bond strength development between latex-modified cement paste and steel. Cement and concrete research, 17, pp 562–572, (1987).Google Scholar
[6] Dingley, R.G. The structure and properties of hydraulic cement pastes modified with polymer latex. PhD thesis, University of Southampton, UK. 1974.Google Scholar
[7] Su, Z., Bijen, J.M., Larbi, J.A. The influence of polymer modification on the adhesion of cement pastes to aggregates. Cement and Concrete research. 21, pp. 727–736, (1991).Google Scholar
[8] Carter, L.G., Evans, G.W. A study of Cement-Pipe bonding. SPE 764. Feb 1964.Google Scholar
[9] Carpenter, R.B., Brady, J.L., Blount, C.G. Effect of temperature and cement admixes on bond strength. Journal of petroleum technology August 1992.Google Scholar
[10] Majumdar, A.J., Laws, V. Glass Fibre Reinforced Cement, (published by BSP Professional books,1991).Google Scholar