Products for ultra-high temperature cement slurry systems
2024-04-11 14:57:16
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The cement slurry system with fluid loss additive CG811S and retarder CH710L as the main agents is suitable for ultra-high temperature wells, with a temperature resistance of up to 210°C, normal slurry fluidity, adjustable thickening time, and a "right angle" thickening curve.
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The cement slurry system with fluid loss additive CG811S and retarder CH710L as the main agents is suitable for ultra-high temperature wells, with a temperature resistance of up to 210°C, normal slurry fluidity, adjustable thickening time, and a "right angle" thickening curve.
Difficulties
When cementing deep and ultra-deep wells, ultra-high temperatures and other complex conditions at the bottom of the well pose severe challenges to cementing technology, and cementing quality is difficult to guarantee. Therefore, the development of cementing slurry technology has become a key point. The development of ultra-high temperature cementing slurry technology ultimately relies on the upgrading of cementing additives, especially high temperature retarders and fluid loss additives. The retarder and fluid loss additive products currently used in China generally have poor resistance to high temperature and salt in the ultra-high temperature cementing environment, making it difficult to ensure the safety of cementing construction.
Characteristics of ultra-high temperature cement slurry system with fluid loss additive CG811S and retarder CH710L as main components
Ø Applicable to high and ultra-high temperature wells, with a maximum temperature resistance of 210℃
Ø Applicable to low-density and normal-density cement slurry systems.
Ø Normal cement slurry fluidity, less free liquid.
Ø Good cement block strength.
Ø Adjustable thickening performance, thickening curve is "right angle".
Solutions
Properties of 210℃ Ultra-high Temp. Cement Slurry
Items Experimental Conditions Required Values Actual Values Slurry density, g/cm3 25℃, atmospheric -- 1.86 Fluid loss property Fluid loss, ml 210℃, 6.9MPa ≤100 42 Thickening properties Initial consistency, Bc 210℃/99min, 135MPa ≤30 23 Thickening time, min ≥170 441 40-100Bc thickening time, min ≤40 7 Thickening curve shape Normal Normal Free liquid, % ≥14 0.2 24h compressive strength, MPa 210℃, 20.7MPa ≥14 25.8 Slurry formulation: Cement (Class G) +50% silicon powder+5% micro-silicon+1.5% CG811S+9% CH710L+1.5% CF310S+0.2% CX410L
