Oilfield Chemicals

oilfield chemicals

Alkaline-Surfactant-Polymer (ASP) Flooding System

Alkaline-Surfactant-Polymer (ASP) flooding is a combined EOR chemical system that synergizes alkali (sodium carbonate or sodium hydroxide), surfactant, and polymer to maximize oil displacement and sweep efficiency in mature waterflooded reservoirs. The alkali reacts with crude oil acidic components to generate in-situ surfactants, reducing the required dosage of injected surfactant by 30–50%. Widely deployed in major Chinese oilfields (Daqing, Shengli) with incremental recovery of 15–20% OOIP.

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Ammonium Bisulfite Oxygen Scavenger for Drilling Fluids

CAS: 10192-30-0

Ammonium bisulfite is a fast-reacting oxygen scavenger used to remove dissolved oxygen from drilling fluids, completion fluids, and workover brines, preventing oxygen-induced corrosion of drill string, casing, and downhole equipment. It reacts stoichiometrically with dissolved O₂ to form ammonium sulfate, achieving oxygen levels below 20 ppb within minutes. Supplied as a concentrated aqueous solution for easy injection.

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Ammonium Persulfate Fracturing Fluid Gel Breaker

CAS: 7727-54-0

Ammonium persulfate is an oxidative gel breaker used to degrade guar gum and HPG fracturing gels after proppant placement, enabling rapid flowback of broken fluid and cleanup of the fractured formation. It generates free radicals upon thermal activation that cleave polysaccharide chain bonds, reducing gel viscosity below 5 cP for effective cleanup. Typical dosage is 1–10 lb/Mgal depending on gel loading and bottom-hole temperature.

oilfield chemicals

Asphaltene Inhibitor Dispersant

Asphaltene inhibitor is an aromatic resin-based dispersant that prevents asphaltene aggregation, flocculation, and deposition in production tubing, surface facilities, and crude oil pipelines. It stabilizes asphaltene particles in the crude oil matrix by steric and electrostatic mechanisms, significantly reducing plugging incidents. Effective at dosages of 50–500 ppm and compatible with oil-based and mixed injection systems.

oilfield chemicals

Barite Weighting Agent for Drilling Fluids

CAS: 13462-86-7

API-grade barite (barium sulfate) is the industry-standard weighting agent for increasing the density of water-based and oil-based drilling fluids to control formation pressure and prevent wellbore kicks. With a specific gravity of 4.2 g/cm³, it allows mud density to be raised up to 2.65 g/cm³ (22.0 ppg) without excessive solids loading. API-grade barite meets the stringent specifications of API 13A for soluble Ba, Cd, Hg, and Pb content.

oilfield chemicals

Borate Crosslinker for Fracturing Fluids

Borate crosslinker is an aqueous alkaline solution of sodium or potassium tetraborate used to crosslink guar gum and hydroxypropyl guar (HPG) base fluids into high-viscosity elastic gels for hydraulic fracturing. Crosslinked gels achieve viscosities of 1000–5000 cP, providing superior proppant transport and fracture width support compared to uncrosslinked fluids. Borate crosslinks are thermally reversible, allowing effective gel breaking and cleanup after fracturing.

oilfield chemicals

Calcium Chloride Cement Accelerator

CAS: 10043-52-4

Calcium chloride (CaCl₂) is an effective cement accelerator used in shallow, cold-temperature oil well cementing operations to shorten the thickening time and compressive strength development of Portland cement slurries. At dosages of 1–4% BWOC, it can reduce the time to 500 psi compressive strength by 30–60%. Anhydrous and flake grades are both used in oilfield cementing, with flake grade preferred for on-site mixing.

oilfield chemicals

Carboxymethyl Hydroxyethyl Cellulose (CMHEC) Fluid Loss Additive

CMHEC (Carboxymethyl Hydroxyethyl Cellulose) is a dual-substituted cellulose ether used as a fluid loss control agent in cement slurries, drilling fluids, and completion fluids. It provides excellent filtration control under both static and dynamic conditions and at temperatures up to 150°C. CMHEC is particularly valued for its ability to provide simultaneous fluid loss control and mild viscosification in cement slurries without excessive retardation.

oilfield chemicals

Citric Acid Iron Control Agent

CAS: 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.

oilfield chemicals

DTPMP Scale Inhibitor (Diethylenetriamine Penta(methylene phosphonic acid))

CAS: 15827-60-8

DTPMP is a high-performance phosphonate sequestrant and scale inhibitor used extensively in oilfield produced water and injection water treatment. With five phosphonate groups, it provides superior chelation of calcium, magnesium, barium, and strontium ions, effectively preventing scale deposition in pipelines and downhole equipment. It is compatible with most oilfield biocides and corrosion inhibitors.

oilfield chemicals

Drilling Mud Lubricant for Drill Bit and String

Drilling mud lubricant is a synthetic or fatty acid ester-based additive that reduces torque and drag on the drill string, BHA, and drill bit during directional and horizontal drilling operations. It reduces the coefficient of friction by up to 70% in water-based mud systems and is effective in both clay-inhibited and salt-saturated drilling fluids. The product helps extend bit life, reduce stuck pipe incidents, and improve drilling efficiency in extended-reach wells.

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Enhanced Oil Recovery Surfactant Microemulsion

Enhanced oil recovery (EOR) surfactant microemulsion is a tailored blend of anionic and non-ionic surfactants formulated to achieve ultra-low interfacial tension (IFT) between crude oil and brine, mobilizing residual oil in depleted reservoirs. It reduces oil-water IFT to below 10⁻³ mN/m, enabling displacement of trapped oil from pore spaces inaccessible to conventional waterflooding. Optimized for specific crude oil types and reservoir salinity conditions.

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Filming Amine Corrosion Inhibitor

Filming amine corrosion inhibitor is a long-chain fatty amine derivative that forms a durable monomolecular protective film on metal surfaces in oil and gas production systems. It is highly effective in sweet (CO₂) and sour (H₂S) environments, including multiphase flow conditions with mixed oil-water-gas streams. The product achieves corrosion inhibition efficiencies above 90% in both batch and continuous injection applications.

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Fluorosurfactant Wetting Agent for Oilfield

Fluorosurfactant wetting agent is a perfluoroalkyl or fluorotelomer-based surfactant used in oilfield applications to alter reservoir rock wettability from oil-wet to water-wet, improving water flood displacement efficiency. At concentrations as low as 50–500 ppm, it dramatically reduces surface and interfacial tension, enabling superior water spreading and penetration into tight pore structures. It is used in stimulation pre-flush, EOR wettability modification, and drilling fluid additive applications.

oilfield chemicals

Guar Gum Fracturing Fluid Base

CAS: 9000-30-0

Oilfield-grade guar gum is the primary viscosifier and proppant carrier used in hydraulic fracturing fluids. Hydrated at 20–40 lb/Mgal, it builds sufficient viscosity (50–500 cP) to transport proppant deep into created fractures while maintaining good fluid leakoff control. High-purity fast-hydrating grades (≥85% through 200 mesh) are formulated for compatibility with borate and zirconate crosslinkers in modern frac fluid systems.

oilfield chemicals

HEDP Scale Inhibitor (Hydroxyethylidene Diphosphonic Acid)

CAS: 2809-21-4

HEDP is a highly effective phosphonate scale and corrosion inhibitor widely used in oilfield water treatment, cooling water systems, and injection water management. It demonstrates excellent inhibition against calcium carbonate, calcium sulfate, and barium sulfate scales at low dosage levels (2–20 ppm). HEDP is stable under high-temperature conditions up to 200°C and exhibits strong chelation of metal ions.

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Hydrolyzed Polyacrylamide (HPAM) EOR Polymer

Hydrolyzed Polyacrylamide (HPAM) is the world's most widely used polymer for chemical enhanced oil recovery (EOR), providing mobility control in waterfloods by increasing the viscosity of the injected water phase. At typical field concentrations of 500–2000 ppm, it increases water viscosity from 1 to 10–40 mPa·s, improving sweep efficiency and reducing water channeling through high-permeability streaks. Molecular weight grades from 5 to 35 million Daltons are available to match reservoir conditions.

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H₂S Scavenger Triazine

H₂S scavenger triazine is a water-soluble, non-regenerable chemical used for the removal of hydrogen sulfide from produced gas, crude oil, and water streams in oilfield operations. Based on triazine chemistry (reaction product of monoethanolamine and formaldehyde), it irreversibly reacts with H₂S to form water-soluble, non-toxic dithiazine byproducts. Effective for H₂S concentrations from trace levels up to 5000 ppm.

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Imidazoline Corrosion Inhibitor for Oil Wells

CAS: 27136-73-8

Imidazoline-based corrosion inhibitor is a nitrogen-containing heterocyclic compound widely used to protect steel surfaces in oil and gas production against CO₂, H₂S, and organic acid corrosion. It forms a protective adsorbed film on metal surfaces, achieving corrosion protection efficiency above 95% in harsh sour and sweet service conditions. Suitable for use in production tubing, pipelines, and surface facilities.

oilfield chemicals

Kinetic Hydrate Inhibitor (KHI) Polymer

Kinetic Hydrate Inhibitor (KHI) is a low-dosage hydrate inhibitor (LDHI) based on polyvinylcaprolactam (PVCap) or polyvinylpyrrolidone (PVP) that delays hydrate nucleation and crystal growth rather than thermodynamically shifting equilibrium conditions. Effective at concentrations of 0.1–1.0 wt%, representing a 30–60-fold dosage reduction compared to MEG, making it cost-effective and preferred for low water-cut flowlines.

oilfield chemicals

Lignosulfonate Cement Setting Retarder

Calcium or sodium lignosulfonate is a widely used cement retarder in oil well cementing operations that extends the thickening time of Portland cement slurries to allow safe placement in deep, hot, or long casing strings. It is effective over a temperature range of 60–150°C at dosages of 0.1–0.5% by weight of cement (BWOC). Lignosulfonate retarders are cost-effective and compatible with most fluid loss agents and dispersants used in oilfield cementing.

oilfield chemicals

Mercaptobenzothiazole (MBT) Copper Corrosion Inhibitor

CAS: 149-30-4

Mercaptobenzothiazole (MBT) is a highly effective copper and copper alloy corrosion inhibitor used in oilfield cooling water systems, heat exchangers, and process equipment protection. It forms a stable chelate complex with copper ions on metal surfaces, providing excellent protection against copper corrosion from dissolved oxygen, CO₂, and chloride ions at dosages of 1–10 ppm. MBT also exhibits moderate inhibition of iron and zinc in water treatment systems.

oilfield chemicals

Monoethanolamine (MEA) Hydrate Inhibitor

CAS: 141-43-5

Monoethanolamine (MEA) is used in oilfield and gas processing operations as a thermodynamic hydrate inhibitor and acid gas (CO₂/H₂S) scavenger. As a hydrate inhibitor, it depresses the hydrate formation temperature in gas pipelines and subsea flowlines. MEA is also widely used in gas sweetening plants to remove CO₂ and H₂S from natural gas streams, with regeneration efficiency above 90%.

oilfield chemicals

Monoethylene Glycol (MEG) Hydrate Inhibitor

CAS: 107-21-1

Monoethylene Glycol (MEG) is the industry-standard thermodynamic hydrate inhibitor for offshore gas and condensate pipelines, injected at concentrations of 30–60 wt% to depress hydrate formation temperatures by 10–25°C. MEG can be fully recovered and regenerated in onshore MEG reclamation units (MRUs), making it economically preferred for high-volume offshore applications. It also provides mild corrosion protection when combined with pH management.

oilfield chemicals

Naphthalene Sulfonate Cement Dispersant / Superplasticizer

Naphthalene sulfonate formaldehyde condensate (NSFC) is an anionic dispersant used in oil well cement slurries to reduce slurry viscosity, improve pumpability, and lower water-cement ratio for improved compressive strength development. At dosages of 0.1–1.0% BWOC, it can reduce slurry yield point by 50–80% and improve cement placement efficiency in narrow annular clearances. It is compatible with most API cement classes and oilfield cementing additives.

oilfield chemicals

Oilfield Demulsifier SP-169

Demulsifier SP-169 is a classic alkylphenol ethoxylate-based oilfield demulsifier with proven track record in crude oil dehydration worldwide. It effectively breaks water-in-oil emulsions in a wide range of crude types at dosages of 10–100 ppm, delivering residual water below 0.3% and residual oil-in-water below 50 ppm. SP-169 is frequently used as a reference compound and blend component in demulsifier formulation.

oilfield chemicals

Paraffin Inhibitor / Wax Crystal Modifier Polymer

Paraffin inhibitor polymer is a copolymer designed to prevent wax deposition and paraffin plugging in production tubing, flowlines, and crude oil pipelines. It co-crystallizes with paraffin wax at the nucleation stage, modifying crystal growth to yield smaller, non-adherent wax crystals that remain dispersed in the oil stream. Effective at dosages of 50–500 ppm, reducing wax deposition thickness and pigging frequency significantly.

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Pipeline Internal Corrosion Inhibitor

Pipeline internal corrosion inhibitor is a specially formulated blend of imidazoline, quaternary ammonium compounds, and film-forming amines designed for continuous or batch injection into crude oil and gas transmission pipelines. It provides comprehensive protection against CO₂, H₂S, organic acid, and chloride-induced corrosion, achieving corrosion rates below 0.1 mm/year. Suitable for both water-wet and oil-wet pipeline sections under multiphase flow conditions.

oilfield chemicals

Polyalphaolefin Drag Reducer / Flow Improver

Polyalphaolefin (PAO) drag reducer is a high-molecular-weight viscoelastic polymer that significantly reduces turbulent friction losses in crude oil and refined product pipelines, increasing throughput by 10–60% or reducing pump energy consumption. It is supplied as a slurry dispersion for easy injection into pipelines and is effective at concentrations of 2–20 ppm. Compatible with most crude oil types and refined petroleum products.

oilfield chemicals

Polyanionic Cellulose Regular (PAC-R) for Drilling Fluids

CAS: 9004-32-4

PAC-R (Polyanionic Cellulose, Regular grade) is a cellulose-derived fluid loss control agent and viscosifier used in water-based drilling fluids. It effectively reduces filtration loss and builds moderate viscosity in both freshwater and salt-saturated (NaCl, KCl, CaCl₂) mud systems. PAC-R forms a thin, low-permeability filter cake on the borehole wall to prevent formation fluid influx and protect productive formations.

oilfield chemicals

Polyaspartic Acid (PASP) Scale Inhibitor

CAS: 35608-01-6

Polyaspartic Acid (PASP) is a biodegradable, environmentally friendly scale inhibitor and dispersant for oilfield water systems, cooling water, and produced water injection. It provides effective threshold inhibition of calcium carbonate, calcium sulfate, and calcium phosphate scales. PASP is particularly valued in environmentally sensitive offshore and onshore operations where biodegradable chemistry is mandated.

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Polyether Demulsifier for Crude Oil

Polyether demulsifier is an EO/PO block copolymer-based chemical used for efficient oil-water separation in crude oil production and processing. It destabilizes water-in-oil and oil-in-water emulsions by displacing natural emulsifiers from the oil-water interface, achieving residual water content below 0.5% at low dosage (10–50 ppm). Suitable for both offshore and onshore production facilities and compatible with a wide range of crude oil types.

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Potassium Chloride (KCl) Clay Stabilizer

CAS: 7447-40-7

Potassium chloride is the most widely used inorganic clay stabilizer in drilling fluids, completion fluids, and well stimulation treatments. The K⁺ ion preferentially replaces Na⁺ in the interlayer of swelling clays (smectite, montmorillonite), suppressing clay hydration and preventing fines migration that could damage formation permeability. KCl is used at 2–5 wt% in completion brines and at 3–8 wt% as a clay stabilizer in hydraulic fracturing treatments.

oilfield chemicals

Potassium Silicate Shale Inhibitor for Drilling Fluids

Potassium silicate shale inhibitor is an inorganic polymer used in water-based drilling fluids to suppress clay swelling, shale hydration, and wellbore instability in reactive shale formations. The silicate anion plugs microporosity in shale, while the potassium cation provides additional ion exchange inhibition of clay minerals. It provides exceptional borehole stability in highly reactive clay-rich formations, reducing washouts and pack-offs.

oilfield chemicals

Pour Point Depressant (PPD) for Crude Oil

Pour point depressant (PPD) is a polymeric additive that reduces the pour point of waxy crude oils by modifying wax crystal morphology, preventing large crystal aggregation and maintaining flowability at low temperatures. Effective dosages range from 100–1000 ppm, typically reducing the pour point by 15–30°C. PPD enables safe transportation of high-wax crude oils through pipelines in cold climates without heating or blending.

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Quaternary Ammonium Oilfield Corrosion Inhibitor

Quaternary ammonium-based corrosion inhibitor provides effective protection of carbon steel equipment and pipelines in oilfield water injection, production, and transportation systems. It functions through adsorption onto metal surfaces, forming a hydrophobic barrier against corrosive species including chloride ions, dissolved oxygen, CO₂, and H₂S. The product combines corrosion inhibition with bacteriostatic activity.

oilfield chemicals

Resin Amine Demulsifier

Resin amine demulsifier is synthesized from polycondensed phenolic resin alkoxylated with ethylene oxide and propylene oxide, producing a highly surface-active molecule with superior interfacial activity. It is especially effective for treating tight, aged, or thermally stable crude oil emulsions that are resistant to conventional polyether demulsifiers. The product demonstrates excellent performance at elevated temperatures (60–100°C) encountered in thermal recovery and heavy oil processing.

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Scleroglucan EOR Biopolymer

CAS: 39464-87-4

Scleroglucan is a triple-helix natural polysaccharide biopolymer produced by fermentation of Sclerotium rolfsii, used as a mobility control agent in enhanced oil recovery polymer flooding. Unlike HPAM, scleroglucan is highly resistant to high-temperature (up to 120°C), high-salinity (up to 200 g/L TDS), and divalent cation (Ca²⁺, Mg²⁺) conditions that degrade synthetic polymers. It is particularly valued for EOR in hot, high-salinity reservoirs where HPAM performance is insufficient.

oilfield chemicals

Silicone Antifoam / Defoamer for Oilfield Production

Silicone-based oilfield defoamer is a polydimethylsiloxane (PDMS) emulsion or compound formulation used to control foam in crude oil separation, produced water treatment, gas scrubbing, and drilling fluid systems. It is effective at extremely low dosages (1–50 ppm) and rapidly collapses both surface foam and entrained gas bubbles. The product is compatible with amine gas treating units, crude oil separators, produced water systems, and drilling mud systems.

oilfield chemicals

Sodium Molybdate Corrosion Inhibitor Synergist

CAS: 7631-95-0

Sodium molybdate dihydrate is an anodic corrosion inhibitor and synergist used in cooling water systems, oilfield water injection, and heat transfer fluid formulations. The molybdate anion forms a stable passivation layer on ferrous metal surfaces by oxidizing the surface to form Fe₂O₃·MoO₃, significantly reducing anodic corrosion rates. It is frequently used in combination with azoles, phosphates, and zinc salts, achieving synergistic corrosion protection at total dosages of 50–200 ppm.

oilfield chemicals

THPS Biocide (Tetrakis(hydroxymethyl)phosphonium Sulfate)

CAS: 55566-30-8

THPS (Tetrakis(hydroxymethyl)phosphonium Sulfate) is a broad-spectrum, environmentally acceptable biocide used for microbiological control in oilfield water injection systems, drilling fluids, and produced water. It is highly effective against sulfate-reducing bacteria (SRB), acid-producing bacteria (APB), and general heterotrophic bacteria at low dosages (50–500 ppm). THPS is also used as an iron sulfide (FeS) dissolver to remove scale deposits in oilfield systems.

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Thiourea Acid Corrosion Inhibitor

CAS: 62-56-6

Thiourea is an effective corrosion inhibitor used in acidizing operations and acid cleaning of oilfield equipment, protecting steel tubulars from attack by hydrochloric and hydrofluoric acid systems. It adsorbs onto metal surfaces through its sulfur and nitrogen atoms, suppressing both anodic and cathodic corrosion reactions. Thiourea is typically used in combination with other inhibitors and intensifiers for synergistic protection.

oilfield chemicals

Treated Bentonite for Drilling Fluids

CAS: 1302-78-9

Treated bentonite is a sodium montmorillonite clay mineral that serves as the primary viscosifier and filtration control agent in water-based drilling fluid systems. API-grade treated bentonite hydrates readily in freshwater to build yield point and gel strength for cuttings suspension, with a yield of ≥91 bbl/ton. It forms a flexible, low-permeability filter cake on the borehole wall during drilling operations.

oilfield chemicals

Xanthan Gum XCD Polymer for Drilling Fluids

CAS: 11138-66-2

XCD (Xanthan Gum) polymer is a fermentation-derived polysaccharide biopolymer used as a viscosifier and suspension agent in water-based drilling fluids. It provides excellent low-shear-rate viscosity and yield point for efficient drill cuttings suspension and transport, while maintaining low circulating viscosity for good pump efficiency. XCD polymer is salt-tolerant and effective in both fresh water and saturated brine mud systems.

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Zinc Phosphate Anticorrosion Pigment

CAS: 7779-90-0

Zinc phosphate is a non-toxic, lead-free anticorrosion pigment used in protective coatings for oilfield equipment, pipelines, offshore structures, and industrial steel. It functions through multiple mechanisms: barrier effect, cathodic protection from zinc ion release, and phosphate passivation layer formation on metal surfaces. At 10–30% pigment loading in epoxy, alkyd, and polyurethane primers, it provides 1500–3000 hours salt spray resistance.