Aluminum Sulfate As Gel Breaker For Fracturing is an inorganic salt-based gel breaker with Al₂(SO₄)₃·xH₂O as the main component (conventional Al₂O₃ content ≥16%–17%, water solubility ≥99%). In water-based fracturing systems, it rapidly degrades the cross-linked structure through acidification and complexation, achieving controlled gel breaking and low residue backflow.
Application
① Conventional Oil and Gas Well Fracturing
Suitable for fracturing operations in shallow and medium-depth wells, improving flowback efficiency.
② Shale Gas Horizontal Well Fracturing
Provides stable and controllable fracturing during long horizontal well operations, reducing reservoir damage.
③ Tight Reservoir Stimulation
Reduces polymer residue and improves porosity recovery rate.
④ Water-Based Fracturing Fluid Systems
Suitable for clean water-based and low-residue water-based systems.
⑤ Crosslinked Guar Gum System
Specifically designed for boron crosslinked guar gum and modified guar gum fracturing systems.
Product Parameters
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Index requirements of aluminum sulfate as gel breaker for fracturing |
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Indicators |
Standard value |
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Alumina (AL2O3) content, % |
≥15.60 |
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Iron (Fe) content, % |
≤0.5 |
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(Water-insoluble matter) content, % |
≤ 0.2 |
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PH (1% aqueous solution) content, % |
≥ 3.0 |
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Sieve analysis |
10-20 mesh |
pH Range
① Operating pH Range
Suitable for water-based fracturing systems with pH 3.0–8.0, exhibiting stable gel breaking performance under weakly acidic to neutral conditions.
② Effect of pH on Gel Breaking Rate
Lower pH accelerates hydrolysis and shortens gel breaking time; at pH 6–8, it exhibits slow-release gel breaking.
③ Compatibility with Fracturing Fluid Systems
Compatible with crosslinked guar gum and its derivatives systems, without affecting the structural stability of conventional crosslinking agents.
Coagulation Effect
① Viscosity Reduction Capacity
Under conditions of 60–90°C, the viscosity of the cross-linked guar gum system can be reduced from ≥150 mPa·s to ≤5 mPa·s.
② Residue Control
No insoluble oxidative byproducts are produced after gel breaking, and the residue content is lower than that of oxidative gelling agent systems.
③ Adjustable Gel Breaking Time
The gel breaking time can be controlled within the range of 2–8 hours by adjusting the dosage concentration (0.1%–0.5%).
Related Processes
① Addition Method: Can be directly dissolved in water and added via a continuous metering pump.
② Addition Stage: Typically added during the main fracturing stage or the tailings stage to achieve delayed gel breaking.
③ Compatibility with Other Additives: Compatible with drag reducers, clay stabilizers, and corrosion inhibitor systems; does not undergo precipitation reactions.
Batch Stability
① Raw Material Control: Uses industrial-grade/oilfield-grade aluminum sulfate from stable sources, controlling the content of impurity metal ions.
② Active Ingredient Testing: Each batch is tested for Al₂O₃ content, water-insoluble matter, pH, and moisture content.
③ Performance Consistency Testing: Standard gel breaking time and viscosity curve tests are conducted using a simulated fracturing fluid system.
④ Batch Deviation Control: Deviations of key indicators are controlled within ±3% to ensure consistency in on-site operations.
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