Crude Oil Production Fluid Treatment Chemicals: Demulsifiers & H₂S Scavengers for Efficient Oilfield Operations

Introduction: The Two Critical Challenges in Crude Oil Production

Every barrel of crude oil produced from an oilfield carries with it two persistent challenges: emulsified water and hydrogen sulfide (H₂S) .

Water-in-oil emulsions form naturally during oil extraction as crude oil mixes with formation water under high shear conditions. These emulsions are stabilized by natural emulsifiers such as asphaltenes, resins, and waxes, making water separation slow and incomplete without chemical intervention. If not properly treated, emulsified water increases transportation costs, causes corrosion, and leads to refining problems.

Hydrogen sulfide is a toxic, corrosive gas that occurs naturally in many crude oil and natural gas reservoirs. It poses serious safety risks to personnel, corrodes pipelines and equipment, and reduces the quality of petroleum products. The global H₂S scavenger market was valued at USD 861 million in 2024 and is projected to reach USD 1.61 billion by 2033, growing at a CAGR of 7.2%.

Dongying Jusen Chemical supplies a complete range of Crude Oil Production Fluid Treatment Chemicals — including demulsifiers, H₂S scavengers, defoamers, and water clarifiers — designed to address both challenges efficiently and economically.

A demulsifier is a chemical additive that promotes the separation of emulsified water from crude oil by breaking down the interfacial film that stabilizes water-in-oil emulsions. The mechanism involves three key steps:

— the demulsifier molecules displace natural emulsifiers (asphaltenes, resins) at the oil-water interface

— the interfacial film strength is reduced below 0.05 N/m, allowing droplets to coalesce

— water droplets merge and settle, achieving clean separation

Dongying Jusen Chemical offers four main types of demulsifiers, each suited to different crude oil characteristics:

Performance reference: According to SY/T 5281-2019, demulsifier performance is evaluated by bottle test. The standard requires a dehydration rate of ≥80% within 30 minutes (for oil samples with 20% water content), with a clear oil-water interface and no emulsion layer.

Demulsifier selection depends on several factors:

Paraffinic, naphthenic, or mixed-base crude

Low (<20%), medium (20–50%), or high (>50%)

Determined by asphaltene and resin content

Higher temperatures generally improve demulsification

For refinery applications, salt content should be reduced to below 10–25 lb/1,000 bbl

Recommended dosing: 30–100 mg/L for oilfield dehydration. For refinery desalting, dosing may range from 10–50 ppm of active substances based on crude volume.

Crude oil demulsifier can be dissolved in oil and organic solvents such as toluene and xylene. On site, the product can be diluted with appropriate solvent to prepare solutions of different concentrations, or directly added to the crude oil emulsion without dilution.

The demulsifier has a wide range of adaptability, especially effective for the dehydration of low and medium viscosity water-containing crude oil with a viscosity of 30–7,000 mPa·s.

An H₂S scavenger is a chemical agent that removes hydrogen sulfide from oil, gas, and water streams by reacting with H₂S to form stable, non-toxic compounds. Among the various chemistries available — including triazines, amines, and metal-based compounds — triazine-based scavengers have become the industry standard for their high efficiency, low cost, and ease of application.

Triazine scavengers react irreversibly with H₂S to form water-soluble reaction products. The general reaction scheme involves the triazine molecule reacting with two moles of H₂S. Each gallon of triazine can remove approximately 1–2 pounds of H₂S (120–240 kg/m³), depending on the concentration and conditions.

Note: Triazine compound concentration can be customized from 40% to 78% to meet different oilfield requirements.

Research studies provide valuable performance benchmarks for triazine-based H₂S scavengers:

99.6% under optimal conditions, with alkaline conditions favoring H₂S absorption.

92.4%, with an optimal reaction temperature of 45°C and optimal reaction time of 60 minutes.

98.1%.

85–120 g/L, while international triazine solutions range from 120–180 g/L.

For oil and gas wells, the H₂S scavenger can be added from the annular space into the wellbore to eliminate H₂S in the system, protecting equipment and personnel. For produced fluid treatment, it can be directly injected into the wellhead gathering pipeline.

0.1–0.6 kg of scavenger is required per m³ of produced fluid.

0.5–2 kg per cubic meter of gas.

The recommended approach is to install a dosing device at the wellhead for continuous injection, which provides better reaction speed and uniform distribution.

Dongying Jusen Chemical supplies a comprehensive range of crude oil production fluid treatment chemicals:

Demulsifiers, H₂S scavengers, defoamers, and water clarifiers from a single supplier

Triazine concentration from 40% to 78%; demulsifier types tailored to your crude oil

Products supplied to major Chinese oilfields including Shengli, with successful field applications

Our team can help select the right product and dosage for your specific crude oil conditions

Stable supply and factory-direct pricing

Efficient logistics from China to global markets

Polyamine demulsifiers are suitable for waxy and high water cut crude oil at low temperatures. Polyol demulsifiers are hydrophilic with good compound effects, suitable for waxy crude oil and refinery desalting. Phenolic resin demulsifiers are lipophilic with a wide application range and low-temperature demulsification capability.

The recommended dosing concentration is generally 30–100 mg/L for oilfield dehydration, depending on the crude oil type and water content. Specific dosage should be determined through laboratory and field testing.

Triazine scavengers react irreversibly with H₂S to form stable, water-soluble reaction products. Each gallon of triazine can remove approximately 1–2 pounds of H₂S.

Our H₂S scavenger has a desulfurization rate of ≥90%. Modified triazine formulations can achieve higher efficiency under optimized conditions.

Yes. We offer triazine compound concentrations from 40% to 78% to meet different oilfield requirements.

Our demulsifiers comply with SY/T 5280-2018 (General Technical Conditions for Crude Oil Demulsifiers). Our H₂S scavengers meet SY/T 6277-2005 requirements for desulfurization rate.

Yes, samples can be provided for evaluation. Please contact us with your specific requirements.

For quotations, technical data sheets, or samples of Crude Oil Production Fluid Treatment Chemicals (Demulsifiers & H₂S Scavengers), please contact us:

📧 Email: info@jusenchem.com

📞 WhatsApp: +86 18954690080

🌐 Website: www.jusenchem.com

Jusen Chem — your reliable partner for oilfield production chemicals and crude oil treatment solutions.