Calcium & Salt-Resistant Starch with high concentration CaCl2 provides three key advantages: strong inhibition, low friction, and environmental friendliness. In particular, they effectively suppress the hydration, dispersion, and swelling of shale, which is highly beneficial for stabilizing shale and makes them widely applicable in shale gas development.
In high-concentration CaCl₂ drilling fluids, conventional polymer viscosifiers and fluid-loss reducers are ineffective. These systems typically exhibit low ϕ6 and ϕ3 readings and poor low-shear-rate viscosity (LSRV), resulting in weak suspension capacity and excessive fluid loss.
After more than ten years of R&D, we developed CACL-VIS, a starch specially designed for CaCl₂ drilling fluids. When used together with xanthan gum, this product generates high LSRV, significantly improves suspension and cuttings-carrying capacity, and provides excellent fluid-loss control. CACL-VIS is easily biodegradable, synergistically enhances the performance of xanthan gum, and offers broad application prospects in drilling fluids of high-concentration CaCl₂ .
Typical physical properties as below:
Property | Specification | Remarks | |
Appearance | Light yellow powder, free-flowing, non-caking | All the fluid components and testing apparatus are obtained locally by the QC lab of CACAL-VIS manufacturer. | |
Particle Size (80-mesh residue, %) | < 10 | ||
Moisture Content (%) | < 12 | ||
In a 33.3% CaCl₂ drilling fluid system, after hot rolling at 110 °C for 16 hours, the sample is cooled to 49 °C to measure ϕ6, ϕ3, . After further cooling to 25 °C, API fluid loss is measured. HTHP fluid loss is tested at 120 °C. | ϕ6 Reading | ≥5 | |
ϕ3 Reading | ≥3 | ||
| API Fluid Loss (API FL, ml) | ≤ 8 ml | ||
HTHP Fluid Loss (HTHP FL, ml) | ≤15 ml | ||
