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Abstract Generally, Grade G oil-well cement stone easily appears strength shrinkage under high temperature environment (≥110 ℃), and SiO2≥95% quartz sand can be added as a high-temperature strength decline inhibitor. In this paper, the effects of different fineness and content of quartz sand on the strength and comprehensive properties of G grade oil-well cement paste were tested through comprehensive laboratory experiments, and the morphology and hydration products of cement paste were analyzed. The results showed that 30%~35% quartz sand (particle size 80 μm sieve residue 10%~15%) can reduce the ratio of calcium to silicon to 1.0 in the high-temperature hydration product of the cement stone, so as to prevent the strength decline of the oil-well cement stone under high temperature conditions. However, when the temperature rises from 160 ℃ to 180 ℃, the hydration product tobermorite transforms into xonotlite, which reduces the strength of sanded oil-well cement stone, so 160 ℃ can be regarded as a critical decline point. A set of high temperature resistant oil-well cement slurry system formulas was designed with sand oil well cement with 80 μm sieve residue 10%~15% and 30% content as the reference material. The performance of the cement paste can meet the technical indexes of the oil field, which can provide a basis for the later design of the high temperature resistant cement paste system
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Published: 04 January 2024
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2024, Vol. 0 
