Problem, chemistry and evidence comparison matrix

Operating problem	Chemical function	Evidence before selection	Field performance indicator
Internal corrosion	Corrosion inhibitor or oxygen control chemistry	Water chemistry, gases, metallurgy, temperature and corrosion monitoring	Coupon, probe, iron count and failure trend
Mineral scale	Scale inhibitor or removal programme	Ion analysis, pressure and temperature path, deposit identification	Pressure trend, deposit rate and produced water response
Stable water in oil emulsion	Demulsifier	Fresh representative fluid, temperature and bottle test	Separation time, interface quality and water specification
Microbiological activity	Biocide programme	Sampling plan, organism data, biofilm and system compatibility	Trend in microbial counts, corrosion and fouling
Wax or paraffin deposition	Paraffin inhibitor, dispersant or removal chemistry	Crude properties, wax appearance behaviour and flow condition	Pressure, deposition and intervention frequency
Foam	Defoamer or antifoam	Process fluid, gas rate, equipment and compatibility test	Foam height, carryover and separator stability
Hydrogen sulphide	H2S scavenger or control programme	Gas and liquid composition, concentration, contact and safety review	Outlet concentration and treatment efficiency

Selection principle: A chemical is not selected only because it belongs to the right product category. It must perform in the actual Nigerian field fluid, temperature, pressure, residence time and injection condition.

Step 1, define the production problem

Separate symptoms from causes. A pressure increase may reflect scale, wax, solids, hydrates or a mechanical restriction. Poor water separation may arise from fluid changes, temperature, shear, residence time or an unsuitable demulsifier. Build the problem statement from operating history, samples and process data before requesting a product.

Step 2, collect representative data and samples

• Fluid composition and recent laboratory data
• Process pressure, temperature, flow and residence time
• Water cut, solids, gas composition and chemical history
• Metallurgy, elastomers and other materials in contact
• Current injection point, pump range and available dilution water
• Existing treatment rate and monitored outcome
• Representative samples collected and preserved correctly

Step 3, screen chemistry in the laboratory

Laboratory screening reduces field trial risk. The method should represent the operating problem. Demulsifiers can be compared by bottle test under controlled temperature and mixing. Scale and corrosion programmes require chemistry and test conditions that reflect the field. Biocide assessment should consider planktonic organisms, biofilm and system conditions. Record the blank, test method, dose range, contact time and acceptance criterion.

Step 4, verify compatibility

Confirm compatibility with produced fluids, other treatment chemicals, dilution water, seals, tanks and injection equipment. Chemical interactions can create haze, precipitate, loss of activity or handling problems. A product that performs alone may fail when mixed with another chemical in a common line.

Step 5, plan a controlled field trial

Trial control	Record before change	Measure during trial
Baseline	Production, quality, failures and current dose	Same indicators at agreed frequency
Injection	Pump condition, point and calibration	Actual delivered rate and interruptions
Process	Pressure, temperature and flow	Changes that could affect interpretation
Outcome	Acceptance limits and economics	Technical result, side effects and total cost

Step 6, evaluate treatment economics

Compare cost against the full result, not price per litre. Include treatment rate, logistics, storage, injection reliability, downtime avoided, product quality, waste, cleaning, workover and equipment life. A lower price product can cost more if the required dose is higher or performance is unstable.

Technical enquiry checklist

• Problem and affected asset
• Field, facility or process location
• Fluid and deposit analysis
• Pressure, temperature and flow
• Current chemistry and observed result
• Injection equipment and proposed point
• Required documentation, pack size and delivery location

Can the product be selected from a generic data sheet?

A data sheet helps screen products, but representative testing and field conditions are needed for a dependable treatment decision.

Should several chemicals be changed at once?

Usually not. A controlled change makes performance easier to attribute and protects operations from unexpected interactions.

Commercial supply: oilfield and production chemicals in Nigeria. Broader procurement: chemical supplier in Nigeria.