Citric Acid Iron Control Agent
CAS Number: 77-92-9
Citric acid is used as an iron control agent in acidizing, fracturing, and drilling fluid applications to prevent the precipitation of iron hydroxide (Fe(OH)₃) and iron sulfide (FeS) that would cause severe formation damage and plugging. It chelates ferric ions (Fe³⁺) in acid solution, maintaining iron in solution and preventing gelatinous precipitates from plugging pore throats or perforations. Typical dosage is 20–100 lb/Mgal in acid systems.
Technical Specifications
| appearance | White crystalline powder |
| purity (%) | ≥99.5 |
| moisture (%) | ≤0.5 |
| heavy metals (as Pb, ppm) | ≤10 |
| Fe³⁺ chelation capacity (g Fe/kg citric acid) | ≥25 |
Applications
- HCl and HF acid treatment iron control
- Hydraulic fracturing fluid iron sequestration
- Sandstone acid stimulation iron management
- Carbonate acidizing iron precipitation prevention
- Scale dissolution treatment iron control
Key Features
- Effective iron chelation in both acidic and neutral pH ranges
- Prevents iron hydroxide precipitation at pH ≥ 2
- Biodegradable and acceptable for use in sensitive environments
- Cost-effective alternative to more expensive EDTA and NTA chelants
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