Aluminum sulfate as gel breaker for fracturing is a white crystal with a specific gravity of 1.69. It is easy to absorb moisture and form lumps when stored in the air for a long time. The dehydration temperature is 86.5℃. It is soluble in water, acid and alkali. The aqueous solution is acidic and has a sour and astringent taste. starts to decompose when heated to 530℃ and ends at 860℃. The final decomposition product is AL2O3. During the hydrolysis process of Aluminum sulfate as gel breaker for fracturing, the intermediate product basic salt is first generated, and then aluminum hydroxide is generated.
Application
The application of aluminum sulfate in gel breaking of oilfield drilling mud is mainly reflected in the following aspects:
- Adjust the viscosity and rheological properties of mud: As an additive of drilling fluid, aluminum sulfate can increase the viscosity and stability of drilling fluid, and improve drilling efficiency and wellbore stability.
- Improve cementing quality and completion effect: In the process of oil well completion and cementing, aluminum sulfate, as an additive of cement slurry, can adjust the viscosity and rheological properties of cement slurry, thus improving cementing quality and completion effect.
- Removal of suspended solids and heavy metal ions from wastewater: In the process of oilfield production, aluminum sulfate can be used as a precipitant to effectively remove suspended solids, grease, and heavy metal ions from wastewater and purify wastewater to meet the requirements of environmental protection.
- Plugging the borehole and reducing oil and gas influx: As a plugging agent, aluminum sulfate can react with water in the formation to generate sediment, effectively plugging the borehole and reducing oil and gas influx, thus ensuring the stability and safety of oil well production.
The specific mechanism of aluminum sulfate in gel breaking of oilfield drilling mud is as follows:
- Viscosity adjustment: Aluminum sulfate can increase the viscosity of mud, make it more stable during drilling, and reduce mud loss and leakage.
- Stability improvement: By adjusting the rheological properties of mud, aluminum sulfate can ensure a smooth drilling process and reduce drilling accidents caused by unstable mud.
- Environmental protection effect: As a precipitant, aluminum sulfate can effectively remove suspended solids and heavy metal ions in wastewater and reduce environmental pollution.
- Plugging effect: By reacting with water in the formation to generate sediment, aluminum sulfate can plug the borehole, prevent oil and gas from entering, and ensure the stability and safety of oil well production.
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 |
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