1 Highlights
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Designing of cement slurry without filtration control agent causes much water to be lost from the slurry, thereby affecting other properties of the slurry such as viscosity and thickening time.
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Nanoparticles help control fluid loss from the cement slurry, and its performance varies with temperature, type and the content of nanoparticles.
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Nanoparticles fill the voids between cement grains, resulting in the immobilization of free water.
2 Introduction
3 Experimental Programs
3.1 Experimental Materials
Chemical composition (wt%) | Mineralogical composition (wt%) | ||||||||
---|---|---|---|---|---|---|---|---|---|
SiO2 | Al2O3 | Fe2O3 | CaO | MgO | SO3 | C3S | C2S | C4AF | C3A |
23.056 | 2.86 | 3.52 | 65.2 | 1.79 | 2.12 | 59.890 | 16.756 | 10.70 | 1.63 |
Species | Diameter (nm) | Color | Surface volume ratio (m2/g) | pH value | Purity (%) |
---|---|---|---|---|---|
SiO2 | 20 | White | 220 | 5.7 | 99.9 |
TiO2 | 20 | White | 160 | 6.8 | 99.9 |
Al2O3 | 20–30 | White | 50–80 | 6.8 | 99.9 |
3.2 Experimental Methods
3.2.1 Slurry Design and Fluid Loss Test
4 Experimental Results
4.1 The Effect of Adding Single Nanoparticles
4.2 The Effect of Adding Binary Nanoparticles
4.3 The Effect of Adding Ternary Nanoparticles
Batch of slurry | Nanoparticle dosage (%) | Calculated API fluid loss (mL/30 min) | ||
---|---|---|---|---|
70 °C | 80 °C | 90 °C | ||
Control | 0 | 119 | 128 | 140 |
NSTA1 | 1 | 92 | 96 | 99 |
NSTA2 | 2 | 83 | 89 | 93 |
NSTA3 | 3 | 61 | 63 | 74 |
NSTA4 | 4 | 48 | 52 | 59 |