ABSTRACT:

Cement strength retrogression under high-temperature restricts the use of the oil well cement. Previous studies evaluated the effect of the silica (SiO2) particles on mitigating the effect of temperature on the mechanical properties of the cement at specific time periods. In this work, the changes in the mechanical properties of the SiO2 based cement will be evaluated continuously with time from a slurry to set. Two samples were prepared, one without SiO2 while the other one containing 35% BWOC of SiO2 particles. The changes in the mechanical properties of the samples when exposed to 140°C were then studied. The results of this study confirmed that incorporating 35% BWOC of SiO2 particles accelerated the hydration process, and thus, improved the cement strength retrogression resistance. The final stabilized compressive strength of the base sample (i.e. sample without SiO2 particles) was 743 psi compared to 6200 psi for the sample incorporating SiO2 particles. Poisson's ratio of the sample incorporating SiO2 stabilized at 0.19 which is equivalent to 52.8% of the Poisons ratio for the base cement. The final stabilized bulk, Young's, shear, and uniaxial compaction moduli of the sample including 35% BWOC of SiO2 are 1.87, 3.86, 2.71, and 2.46 of those for the base sample, respectively.

Keywords:
cement property, Upstream Oil & Gas, strength, mechanical property, Poisson, cement chemistry, sio 2, casing and cementing, kpsi, compressive strength
Subjects:
Casing and Cementing, Cement formulation (chemistry, properties)
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2019. American Rock Mechanics Association
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