Corrosion Inhibitor

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The corrosion inhibitor uses oleic acid imidazoline as the primary active ingredient, compounded with thiourea derivatives and alkynol synergists. The polar groups (N, O atoms) in the imidazoline molecule adsorb onto the metal surface, forming a dense hydrophobic protective film that blocks corrosive media (H2S, CO2, Cl-) from contacting the metal, thereby reducing the corrosion rate.

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Product Overview

The corrosion inhibitor uses oleic acid imidazoline as the primary active ingredient, compounded with thiourea derivatives and alkynol synergists. The polar groups (N, O atoms) in the imidazoline molecule adsorb onto the metal surface, forming a dense hydrophobic protective film that blocks corrosive media (H2S, CO2, Cl-) from contacting the metal, thereby reducing the corrosion rate.

The water-soluble type (CI-W) uses water as the carrier, suitable for water injection systems and high water-cut fluids. The oil-soluble type (CI-O) is dissolved in hydrocarbon solvents, suitable for low water-cut crude and gas gathering pipelines. Both types share the same film-forming mechanism but differ in carrier medium.

Packaging and Storage

Item	Specification
Model	HDC-CI Series (Water-soluble CI-W / Oil-soluble CI-O)
Packaging	25 kg plastic pail (sample) 200L iron/HDPE drum (~200 kg net) 1000L IBC tote (~1000 kg net)
Storage	Cool, ventilated; away from heat and flame; keep sealed
Shelf Life	12 months
Safety Notes	Alkaline product — wear alkali-resistant gloves and goggles; flush eyes with water if contacted

Technical Specifications

Item	CI-W	CI-O	Test Standard
Appearance	Dark brown liquid	Dark brown viscous liquid	Visual
Active Content	≥30% (formulated)	≥80% (concentrate)	Titration
Density	1.00-1.10 g/cm³	0.90-0.98 g/cm³	GB/T 4472
Kinematic Viscosity	≤50 mm²/s	≤100 mm²/s	GB/T 265
pH	8-11	—	GB/T 9724
Flash Point	≥60℃	≥60℃	GB/T 261
Corrosion Inhibition Rate	≥90%	≥90%	SY/T 5273-2014
Corrosion Rate	≤0.076 mm/a	≤0.076 mm/a	SY/T 5273-2014 Coupon method
Pour Point	≤-10℃	≤-15℃	GB/T 510
Solubility	Soluble in water, alcohols	Soluble in alcohols, hydrocarbons	Visual

Product Advantages

• High inhibition rate

Inhibition rate ≥90%; at 25 ppm, carbon steel corrosion rate drops from 0.5-1.0 mm/a to below 0.076 mm/a
• Durable film

Imidazoline molecules form a chemisorbed film on metal surfaces — resistant to fluid shear, providing multi-day protection after pre-filming
• Broad corrosion coverage

Simultaneously effective against H2S, CO2 and HCl — no need for separate inhibitors for different corrosion sources
• Dual-solubility options

Water-soluble and oil-soluble types available for high and low water-cut systems respectively — covers all oilfield conditions
• Good compatibility

No precipitation or efficacy reduction when co-dosed with demulsifiers, biocides or scale inhibitors
• Standard-compliant

Performance indicators comply with SY/T 5273-2014 standard for oilfield produced water corrosion inhibitors

Application Scenarios

● Sour oil and gas wells — inhibits H2S acid corrosion on tubing and downhole equipment, preventing sulfide stress cracking (SSC)

● CO2-EOR production — protects pipelines and equipment from CO2 corrosion in enhanced oil recovery fluids

● Gathering and transportation pipelines — maintains protective film on pipe inner walls during long-distance transport

● Water injection systems — protects injection lines and water treatment equipment from high-salinity produced water corrosion

● Refinery overhead — inhibits HCl dew-point corrosion in atmospheric column overhead systems

Dosing Guidelines

The corrosion inhibitor is continuously injected into pipelines or wellbore via chemical injection pumps. For initial application, a "pre-filming" treatment at 2-3 times the normal dosage is recommended (typically 24-48 hours) to rapidly establish the protective film on metal surfaces, followed by transition to the maintenance dosage. The injection point should be at the pipeline inlet or wellhead to ensure adequate dispersion in the fluid.

Scenario	Pre-film Dosage	Maintenance Dosage	Notes
Pipeline	50-100 mg/L (24-48h)	20-50 mg/L	Continuous injection
Water injection	50-80 mg/L (24h)	15-30 mg/L	Use CI-W type
Sour well	100-200 mg/L (48h)	30-80 mg/L	Use CI-O type
CO2 service	80-150 mg/L (24-48h)	30-50 mg/L	Adjust by CO2 partial pressure
Refinery overhead	20-50 mg/L	10-20 mg/L	Inject at overhead reflux

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