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Improving the Performance of Oilwell Cement by Graft-modified PB Latex

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Abstract

Graft-modified polybutadiene (PB) latex was synthesized and used as an admixture to improve the performance of oilwell cement. Results showed that the addition of latex to pure cement slurry can significantly reduce the fluid loss of the cement slurry. When the dosage was 8%, the fluid loss was only 38 mL, and the fluidity of the cement slurry was improved. With an increasing amount of latex, the fluidity of the cement slurry increased continuously. The toughness of cement was significantly enhanced, whose average elastic modulus was 4.2 GPa. Scanning electron microscopy revealed that the filter cake of the cement slurry with latex was thin and dense, and the surface was coated with a layer of latex film. The microstructure of the cement stone showed a high density, and an interweaving mesh network formed in the cement. The results of cement hydration heat analysis and X-ray diffraction showed that latex inhibited the hydration of cement; the effect was stronger under a larger amount of latex. It is indicated that the graft-modified PB latex has great potential to replace the conventional styrene-butadiene rubber (SBR) latex for cementing in the future.

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Acknowledgements

This study was supported by the National Science and Technology Major Project of China (No. 2016ZX05020-004).

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Correspondence to Jintang Guo.

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Guo, J., Pan, W., Fan, J. et al. Improving the Performance of Oilwell Cement by Graft-modified PB Latex. Trans. Tianjin Univ. 24, 434–441 (2018). https://doi.org/10.1007/s12209-018-0130-1

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  • DOI: https://doi.org/10.1007/s12209-018-0130-1

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