Vanconol® ET-103 Scale & Corrosion Inhibitor for Oilfield Produced Water

1. 🎯 Product Overview

In oilfield produced water treatment, corrosion and scaling coexist and exacerbate each other:

• Corrosion risk: Corrosive species such as H₂S, CO₂, dissolved oxygen, and bacteria accelerate the corrosion of metal pipelines and equipment

• Scaling risk: Ca²⁺ and Mg²⁺ ions in high-salinity water readily form carbonate/sulfate precipitates that adhere to pipe walls, creating scale layers that trigger severe under-deposit localized corrosion

Vanconol® ET-103 is a self-developed integrated scale & corrosion inhibitor built around an alkyl imidazoline corrosion inhibitor, compounded with chelating scale inhibitor components and specialty synergists. It simultaneously addresses both corrosion and scaling challenges and is suitable for oilfield produced water treatment systems.

2. 📊 Key Product Specifications

2.1 Physicochemical Properties

Parameter	Specification	Test Method
Appearance	Yellow transparent liquid	Visual inspection
Water solubility	Water-dispersible, no phase separation	GB/T 6324.1
Density d₂₀ (g/cm³)	0.9 – 1.1	GB/T 13378
pH (10% aqueous solution)	≤ 8	SH/T 0069
Kinematic viscosity (mm²/s, 40℃)	＜ 80	GB/T 265
Corrosion rate (mm/a)	≤ 0.076	Q/SY 126-2014
Scale inhibition efficiency (%)	≥ 90	Q/SY 126-2014

Chemical composition: A composite blend of alkyl imidazoline corrosion inhibitor + chelating scale inhibitor + specialty surfactants + synergists

2.2 Verified Performance Data

The following data were obtained from third-party laboratory evaluation of oil and gas field corrosion inhibitors (N80 steel substrate):

Product	Application	Dosage	Test Method	Test Conditions	Corrosion Inhibition Efficiency	Standard Requirement
ET-103	Produced water	30 ppm	Static coupon test	TDS 62,400 mg/L, 50℃, 7 days	72.18%	≥ 70% ✅

Key finding: At a low dosage of 30 ppm, ET-103 achieves a corrosion inhibition efficiency of 72.18% in static coupon tests, meeting the Q/SY 126-2014 standard requirement (≥ 70%). The product also delivers a scale inhibition efficiency of ≥ 90%, providing dual scale and corrosion protection.

3. 🛠️ Mechanism of Action

ET-103 employs a synergistic scale inhibition + corrosion inhibition mechanism to address the coupled corrosion–scaling challenge in produced water systems at its source:

3.1 Scale Inhibition Mechanism (Chelation-based)

The chelating scale inhibitor components in the formulation suppress scale formation through the following pathways:

• Ion chelation: Active functional groups (carboxyl, acid groups, etc.) in the scale inhibitor form soluble chelates with scale-forming ions such as Ca²⁺ and Mg²⁺, reducing the concentration of free ions and preventing them from reaching the solubility product required for precipitation

• Crystal lattice distortion: Scale inhibitor molecules adsorb onto the surface of calcium carbonate/calcium sulfate crystal nuclei, disrupting crystal growth orientation and producing a loose, porous scale layer that is readily carried away by water flow

• Dispersion: Specialty surfactants disperse micro-scale particles and keep them suspended in the water, preventing aggregation and deposition on pipe walls

3.2 Corrosion Inhibition Mechanism (Adsorptive Film Formation)

The alkyl imidazoline corrosion inhibitor component acts through the same mechanism as ET-102:

• Heteroatoms such as N and metal-anchoring groups adsorb onto the metal surface via coordinate bonds, forming a dense monomolecular adsorption film

• The adsorption film blocks contact between corrosive species (Cl⁻, H₂S, CO₂) and the metal surface, while simultaneously suppressing cathodic hydrogen evolution and anodic dissolution reactions

• Synergists enhance the stability of the adsorption film under high-temperature, high-salinity conditions

3.3 Scale–Corrosion Synergistic Effect

Isolated Issue	Coupled Consequence	ET-103 Synergistic Solution
Scaling → oxygen concentration cells form under deposits → localized corrosion accelerates	Under-deposit corrosion rates can reach 5–10× that of general corrosion	Scale inhibitor eliminates scale layer → removes the root cause of under-deposit corrosion
Corrosion products (FeS/FeCO₃) adhere to pipe walls → serve as new scale nucleation sites	Corrosion–scaling vicious cycle	Corrosion inhibitor suppresses corrosion → reduces corrosion products → reduces scale nucleation sites

4. 📋 Application Guide

4.1 Target Applications

Application	Typical Conditions	Suitability
Oilfield produced water treatment facilities	High salinity (≤ 80,000 mg/L), containing CO₂/H₂S	✅ Recommended
Produced water reinjection pipelines	High Ca²⁺/Mg²⁺ concentrations with scaling tendency	✅ Recommended
Gathering & transportation systems (corrosion-dominant, mild scaling)	CO₂/H₂S corrosion dominant	⚠️ ET-102 recommended (pure corrosion inhibitor, more cost-effective)
Downhole (wellbore)	High temperature and pressure	⚠️ ET-101 recommended (wellbore-specific formulation)

4.2 Differentiation from ET-102

Comparison Criteria	ET-102 (Surface Gathering Corrosion Inhibitor)	ET-103 (Produced Water Scale & Corrosion Inhibitor)
Core Function	Pure corrosion inhibition	Integrated scale + corrosion inhibition
Target Application	Gathering pipelines/station facilities (corrosion-dominant)	Produced water treatment/reinjection (corrosion + scaling coexist)
Scale Inhibition	None	≥ 90% scale inhibition efficiency
Verified Corrosion Inhibition Efficiency (30 ppm, static)	96.16% (TDS 62,400 mg/L, CO₂-saturated)	72.18% (TDS 62,400 mg/L)
Cost Positioning	Economical (single-function)	Integrated (dual-function, reduces number of chemicals)

Selection Guidance: When both corrosion and scaling risks are present in a produced water system, ET-103 is the preferred choice, as it can replace the two-chemical approach of “corrosion inhibitor + scale inhibitor,” simplifying the dosing process and reducing overall costs. If the system is corrosion-dominant with low scaling risk, ET-102 offers better economics.

4.3 Recommended Dosage

Operating Conditions	Recommended Dosage	Notes
Conventional produced water treatment (temperature ≤ 65℃)	≥ 15 ppm	Basis: produced water flow rate
High-temperature produced water (temperature > 65℃)	≥ 75 ppm (active basis)	High temperature accelerates corrosion and scaling; higher dosage required
High scaling tendency (high Ca²⁺/Mg²⁺)	Determine via laboratory testing	Scale inhibition testing recommended prior to use

Dosage Determination Principle: The optimal dosage varies with water quality (salinity, Ca²⁺/Mg²⁺ concentration, corrosive species content). Laboratory simulation testing is strongly recommended prior to field application to determine the most economical yet effective dosage.

4.4 Application Instructions

1. Pre-use inspection: Verify the product is in a uniform, flowable state. If solidified, pre-heat to a flowable condition (recommended water-bath heating, temperature not exceeding 60℃)

2. Dosage calculation: Calculate total chemical required using: produced water flow rate × recommended dosage

3. Dilution: May be diluted as needed; softened water is recommended for dilution. Transfer the calculated amount into a dedicated container and meter it into the system

4. Injection method: Continuous injection via metering pump at the produced water treatment facility inlet or upstream of the mixer is recommended to ensure thorough mixing with the produced water

5. Monitoring: Periodically monitor coupon corrosion rates and scale inhibition efficiency, and adjust dosage dynamically based on results

5. ⚠️ Safety & Storage

• Packaging: Plastic drum, 220 L net weight per drum; custom packaging available upon request

• Storage & transport: Protect from sunlight, heat, moisture, and impact. Store in a clean, cool, dry warehouse

• Residual product: After use, reseal the container immediately to prevent evaporation and moisture absorption

• Shelf life: 12 months under ambient storage conditions

• Safety: The formulation is safe for its intended use. Standard protective gloves and safety goggles are recommended for handling personnel, and relevant environmental regulations should be observed

6. ❓ Frequently Asked Questions (FAQ)

Q1: What is the core difference between ET-103 and ET-102?

A: ET-102 is a pure corrosion inhibitor focused on corrosion protection, while ET-103 is an integrated scale & corrosion inhibitor that addresses both corrosion and scaling. Selection depends on the actual conditions of the produced water system:

• Corrosion-dominant with mild scaling → ET-102 (better economics)

• Corrosion + scaling coexist → ET-103 (dual-function, simplified chemical dosing)

Q2: ET-103’s corrosion inhibition efficiency of 72.18% appears lower than ET-102’s. Does this indicate inferior performance?

A: The two products are tested under different conditions and serve different functional roles, so direct comparison is not appropriate:

• ET-102 (96.16%) was tested under CO₂-saturated, ambient-pressure static conditions as a pure corrosion inhibitor—corrosion inhibition is its sole function

• ET-103 (72.18%) was tested under the same salinity conditions while simultaneously delivering scale inhibition (≥ 90%) and corrosion inhibition. The 72.18% efficiency already meets the Q/SY 126-2014 standard requirement (≥ 70%)

• For systems with concurrent scaling risk, ET-103 provides superior overall protection compared to a combined “ET-102 + separate scale inhibitor” approach

Q3: Can ET-103 replace two separate chemicals (corrosion inhibitor + scale inhibitor)?

A: Yes. ET-103 was designed to replace the dual-chemical approach, offering the following advantages:

• Eliminates the procurement, storage, and dosing equipment for one chemical

• Avoids compatibility issues between two separate chemicals

• Reduces on-site operational complexity and labor costs

Q4: How do we determine the optimal dosage of ET-103 for our produced water system?

A: We recommend the following stepwise approach:

1. Collect a representative produced water sample from the field

2. Conduct static coupon tests in the laboratory with a dosage gradient (15/30/50/75/100 ppm) to measure corrosion inhibition efficiency

3. Simultaneously run scale inhibition tests (e.g., calcium carbonate precipitation method) to measure scale inhibition efficiency

4. Based on the dual performance curves of corrosion and scale inhibition, determine the economical dosage that meets both standard requirements

7. 📞 Technical Support

For additional information, sample testing, or on-site technical support, please contact the Vanconol® technical service team.