Influence of Various Nanomaterials on the Rheology and Hydration Kinetics of Oil Well Cement

Abstract

Nanomaterials have great potential to influence the properties of cement-based materials due to their small particle size and large specific surface area. The influences of Nano-SiO2 (NS), gamma-nano-Al2O3 (GNA), alpha-nano-Al2O3 (ANA), and nano-TiO2 (NT) on the rheology and hydration kinetics of class G cement at 30 °C were investigated in this study. The nanomaterials were added in dry powder form at dosages of 1, 2, 3, 5, and 7% by weight of cement (bwoc), and their dispersion was accomplished using polycarboxylate superplasticizer (PCE) at a dosage of 1.6% bwoc. PCE provides a uniform dispersion of nanoparticles in the cement matrix, enhancing the efficiency of nanomaterials. The w/c ratio varied between 0.718 and 0.78 to form a constant-density slurry of 1.65 g/cm3. Our test results showed that NS and GNA caused significant increases in the rheology of the cement slurry, with this effect increasing with dosage, while ANA and NT tended to reduce the rheology of the slurry. Compared to a well-suspended and well-dispersed cement slurry generated by the use of PCE and diutan gum, all nanomaterials can accelerate early hydration by reducing the induction time, with GNA having the strongest influence, while NS was the only nanomaterial that further increased the long-term hydration heat release at 7 days. The stronger effect of NS and GNA on the cement slurry properties can be attributed to their higher chemical reactivity. The dosage effect on total hydration extent was relatively strong for ANA, NT, and NS from 3% to 5% but weak for GNA in the range from 3% to 7%.

Advanced Solutions for Oil-Well Cementing in High-Pressure High-Temperature Oil Wells Using Nano-Gilsonite

“…15 Another author reported that the structurebuilding ability of cement slurries was substantially enhanced by the addition of nano-SiO 2 (NS) and gamma-nano-Al 2 O 3 (GNA), as demonstrated by the increased values of apparent viscosity, gel strength, and yield stress. 16 Dieder et al reported that gilsonite-enriched cement can result in maintaining the mechanical integrity and reduces the permeability of the cement core, which implicates potential gas mitigation. 17 Another author found that gilsonite-based cement core exhibited 20% decrease in porosity compared to cement core without gilsonite.…”

“…Bayanak et al investigated that 0.5% nanosilica enhances compressive strength by 91% and reduces fluid loss by 77% of cement slurry . Another author reported that the structure-building ability of cement slurries was substantially enhanced by the addition of nano-SiO 2 (NS) and gamma-nano-Al 2 O 3 (GNA), as demonstrated by the increased values of apparent viscosity, gel strength, and yield stress . Dieder et al reported that gilsonite-enriched cement can result in maintaining the mechanical integrity and reduces the permeability of the cement core, which implicates potential gas mitigation .…”

Improving the Efficiency of Cement Mortar to Immobilize Sulfate in Industrial Wastewater Using Different Nanoparticles

“…The use of NMs to improve the performance improvement of materials has been proven in many research areas [12,13]. As for the CBM system, the traditional NMs include nano-silica (NS), nano-calcium carbonate (NC), and nano-metakaolin (NMK) [14][15][16], and the utilization of these NMs is becoming a research hotspot for improving the performance of CBMs. To be specific, NS is a typical NM possessing great pozzolanic activity, filler effect, and crystal core effect; when it is used as a reinforcing material inside CBMs, it exhibits great potential for improving the performance of the material based on the above advantages.…”