Scholarly record

CHARACTERISTICS OF MICROSTRUCTURE AND SELECTED PROPERTIES OF HARDENED CEMENT SLURRIES INCORPORATING GRAPHENE OXIDE

Aleksandra Jamrozik

Abstract

The cementing of wellbores is of the utmost importance at each stage of the drilling jobs. Regardless the conditions in the well, the aim of the cementing job is to efficiently seal the annular space between the casing and the wellbore wall, and to liquidate absorptive zones and also the flow of fluids in the annulus. The properly performed cementing job guarantees successful and safe exploitation of the well. A correctly performed cementing job in a borehole depends on the design of the borehole, geologic-reservoir conditions, technical-technological conditions in the boreholes, cementing job itself and also the quality and composition of the applied cement slurry as well as strength and microstructural properties of hardened cement slurries. The dynamic development of nanotechnology and drilling works performed in increasingly difficult geological-reservoir conditions contributes to the use of nanomaterials as components of cementing slurries. The results of analyses of microstructure and phase composition of cement slurries (based on Portland cement CEM I 42,5 R) modified with graphene oxide are presented in the paper. The microstructural analysis of slurries containing graphene oxide reveals areas of directional positioning within the C-S-H phase. The observation of microstructure of hardened cement slurries inspired authors to broaden the scope of their analyses as far as the porosity and transport properties of the slurries are concerned.

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