Oil Production - COQA · 2S Scavenger Trazines Yes ... CI Bio BIO DM PC AC AF H2S PC WC WC SI DR...

Oil ProductionFacilities and Chemicals

SA Lordo

Topics

Hydraulic Fracking

Production

What is Fracking? Injection of fluid into a

horizontal drilled well (depth 5,000-20,000 ft)

The fluid injected into the rock is typically a slurry of water, proppants, and chemical additives. Fractures are formed using

charges or hydraulically The fluid used contains 95+%

water, sand (proppants), and chemicals

Chemicals used are tailored for the geology of the formation

After fracking, the fluid is removed (flowback)

What Chemicals are Used?

Base Fluid is a cellulose or a Guar derivative

Conventional linear gels Guar based fluids are cross-linked with Boron ions (from aqueous

borax/boric acid solution). – Raises viscosity to allow transportation of the proppants (sand) .These gels have higher

viscosity at pH 9 onwards and are used to carry proppants. – After fracking the pH is reduced to 3 - 4 so that the cross-links are broken and the gel is

less viscous and is therefore pumped out.

Organometallic- cross-linked gels Zirconium, Chromium, Antimony, Titanium Salts can be used to cross-link

guar based gels. – The cross-linking mechanism is not reversible. So once the proppant is pumped down

along with the cross-linked gel and the fracturing part is done. The gels are broken down with appropriate breakers.

Aluminum phosphate-ester oil gels Aluminium phosphate and ester oils are cross-linked to form a gel

– These are one of first known gelling systems. They are very limited in use currently, because of formation damage and the difficulty in clean-up.

Matrix Stimulation - Acidizing

Acidizing has been extensively used since to improve oil and gasproduction

Identification of formation damage key to stimulation success

Chemistry of the stimulation fluids Dissolve or disperse impairment damage Dependent upon type of formation

Hydrochloric acid systems – primarily carbonate formations and preflush for Mud Acid Treatments

Organic acid systems – also for carbonate formations and preflush for Mud Acid Treatments

Special acid systems - HCl systems for specific requirements

Chelant Systems

Fracking Additives

Applications Chemistries Impact Crude Unit Process

Surfactants Acids (citric, latic, etc.); Isopropanol Potentially

Cross Linkers Boric acid(s), Al, Zr, KCl, NH4Cl, CaCl2 yes

Breaker Ammonium Persulfate Potentially

Scale Control Phosphate esters, Phosphonates, glycols Potentially (Fouling)

Biocides Gluteraldehyde, etc. Potentially (WWT)

High Risk Pot. Risk Low Risk

Fracking AdditivesApplications Chemistries Impact Crude Unit

Process

GelsGuar Gum, hydroxyethyl cellulose, phosphate esters

Phosphate ester (yes); others no impact

Corrosion Control Formic Acid, KI, Sb, Imidazolines, Quat Amines, Amides

Potentially

Pipe Cleaner HCl, HF, HBr, DDBSA Yes

Paraffin Control Polyalphaolefin polymers

Some (chlorinated versions)

H2S Scavenger Trazines Yes (depends on type)

Primary Production Facility

Separate oil / condensate, water & gas.

Pump condensate to storage / treatment / sales To pipelines / tanks / processing tankers (FPSO)

Compress gas Gas lift, fuel, reinjection or sales

Clean up water for disposal or injection Disposal must meet environmental standards

Typical Deepwater Field

Typical Land Field Production

System Goals

BS & W < 1% (US); <0.5% overseas Oversea salt specs 10-50 Pounds salt per 1000 BBLS

Crude Oil & Grease < 29 PPM, no visible sheen Acceptable water quality for injection on land based

production 10ppm OIW for surface disposal Dew Point < 3-7 lbs./MMCF Asset Integrity (no leaks) Flow Assurance (100% of the time)

Flow Assurance

Definition: to provide assurance of production throughout a designated flow line

Major chemical issues include: Hydrates Asphaltenes Corrosion Paraffin Antifoams

Common Production Applications

PC AFAC

High Risk

Pot. Risk Low Risk

Oil / Water Separation - Demulsification

Many Types of Available Chemistries:

Polyol Esters

Cross Linked Polyols

Cross Linked Resign/Polyols

Polyamine Oxyalkylates

Sulfonates

Oxyalkylated Phenols

Resins (low oxide)

Resins (high oxide)

Wax Control

Solvents Dispersants Surfactants (cationic,

anionic, nonionic) Inhibitors Crystal modifiers Pour-point

depressants

Corrosion Inhibitors

Dissolved gases are major contributor to oilfield corrosion

3 Gases of concern: O2, CO2, H2S

Contamination naturally present

If no soluble gases; pH of brine ~7.0 Corrosion greatly reduced

Chemistry of CIs

Primary monoamines Polysubstituted monoamines Diamines Polyamines Imidazolines Quaternary ammonium compounds Phosphate Esters

Natural Gas Hydrates

Ice-like crystals form when water and natural gas cool under pressure

Hydrate formation occurs when water and natural gas mixtures above 500 psi cool below 60-75oF.

There are about 8 guest molecules per 46 water molecules.

Hydrate Control

Absorption Glycol dehydration Calcium chloride

Condensation Chilling Joule-Thomson cooling

Adsorption Alumina or silica Molecular sieves

Others Membranes Gas stripping HC displacement

Chemical Methanol Glycol LDHI (newest)

TYPES OF SCALE INHIBITORS

Phosphonates Phosphate Esters Polyacrylates Specialty Polymers Inorganic Phosphates Chelants Combinations

Biocides

The Real Oilfield Troublemakers Microbial Influenced Corrosion (MIC)

– SRB / APB

Bacteria in the Oilfield Aerobic

– Require oxygen for metabolism and growth Anaerobic

– Do not require oxygen for metabolism and growth (O2 is toxic) Facultative

– Biological “switch hitters” Do fine with or without oxygen

Types of Biocides

Chlorine, Bromine Chlorine dioxide Gluteraldehyde THPS Amines/diamines Quaternary amine compounds Isothiazolines Imidazolines Acrolein Bronopol DBNPA

Oxidizing

Non‐oxidizing

Production Additives

Additive Chemistries Impact Crude Unit Process

H2S Scavenger Trazines Yes (depends on type)

Corrosion Control, Biocide

Quantanary Amine Chloride salts Potentially

Emulsion Breaking Water treating polymers Low probability (water-based)

Emulsion Breaking Metal salts (ZnCl2, AlCl2, poly(aluminum) chloride) Yes - corrosion

Emulsion Breaking Oxyalkylate resins No

Production Additives

Applications Chemistries Impact Crude Unit Process

Paraffin control (Dispersants & Inhibitors)

Solvents, Polyalphaolefin polymers

Some (chlorinated solvents)

Scale Control, Corrosion Control

Phosphate esters, Phosphonates Yes – corrosion, fouling

Scale Control Acrylic acids Yes - corrosion

Biocides Gluteraldehyde and others Potentially (WWT)

Upstream Key Takeaways

Each formation is unique

High initial production and steep decline means continuous drilling and completions

Extremely variable crude quality due to geology and production methods

Completion and production chemicals are mostly water soluble

Issues in Shale and Tight Oil Plays

H2S Heavy Molecular Weight Paraffin Scaling Microbes Corrosion Some emulsions

} Top Production Chemicals used in most EagleFord fields

Refinery Solutions

Monitoring/Trending

Desalter optimized programs

Crude stability testing

Proper neutralizer and corrosion inhibitor selection, monitoringand control

Advanced salt dispersants to control crude column or pump around fouling

Bacteria monitoring and biocide treatment program in tank farm

Summary

While there are many chemistries that are used in oil production operation few will impact typical refinery operations

Major impacts from post-production additives (ie, H2S) and well stimulation/acidification additives (ie, HCl, Amines, etc.)

Oil Production - COQA · 2S Scavenger Trazines Yes ... CI Bio BIO DM PC AC AF H2S PC WC WC SI DR...

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