Dilatometric behavior and crystallographic characterization of Portland-polyurethane composites for oilwell high-temperature cementing applications

Silva, Ítalo Batista da; Martinelli, Antônio Eduardo; Souza, Wendell Rossine Medeiros de; Freitas, Júlio Cézar de Oliveira; Rodrigues, Marcos Alysson Felipe

doi:10.1016/j.petrol.2018.06.014

Cited by 12 publications

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References 19 publications

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“…Alteration of the mechanical properties of hydrated Portland cement is expected at high-temperature conditions, since the elevated temperature adversely effects on the cement hydrated products [6,8,9,10,11,12,13,14,15]. The conditions of elevated temperature are expected in deep wells, geothermal wells, and wells subjected to steam injection for enhanced oil recovery (EOR) applications, since the injected steam is able to decrease the oil viscosity, and hence, increase its mobility and finally enhance the oil production [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Nanoclay Content on Cement Matrix for Oil Wells Subjected to Cyclic Steam Injection

et al. 2019

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High-temperature conditions drastically compromise the physical properties of cement, especially, its strengths. In this work, the influence of adding nanoclay (NC) particles to Saudi class G oil well cement (OWC) strength retrogression resistance under high-temperature condition (300 °C) is evaluated. Six cement slurries with different concentrations of silica flour (SF) and NC were prepared and tested under conditions of 38 °C and 300 °C for different time periods (7 and 28 days) of curing. The changes in the cement matrix compressive and tensile strengths, permeability, loss in the absorbed water, and the cement slurry rheology were evaluated as a function of NC content and temperature, the changes in the structure of the cement surfaces were investigated through the optical microscope. The results revealed that the use of NC (up to 3% by weight of cement (BWOC)) can prevent the OWC deterioration under extremely high-temperature conditions. Incorporating more than 3% of NC severely damaged the cement matrix microstructure due to the agglomeration of the nanoparticles. Incorporation of NC particles increased all the cement slurry rheological properties.

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