Q: How to add corrosion inhibitor to high water content oilfield gathering and transportation pipelines?

High-water-cut oilfield gathering and transportation pipelines usually adopt the continuous injection method: an injection point is set up at the wellhead or the starting point of the gathering and transportation trunk line, and the agent is continuously injected through a metering pump at a concentration of 50 to 100 mg/L. For branch pipeline networks, batch processing (slug injection) can also be used, with weekly or monthly filling during pigging. The specific dosage needs to be adjusted based on corrosion monitoring data (coat corrosion rate, iron ion content).

Q: Can oilfield corrosion inhibitors and wax removers be used at the same time?

Yes, but compatibility testing is required. OEM is designed with full consideration of its compatibility with common wax-removing and anti-waxing agents (glycols, solvents). Under normal circumstances, it will not cause precipitation or competitive adsorption failure. It is recommended to mix the two agents in the laboratory according to the actual proportion, observe whether there is layering, turbidity or precipitation, and then apply it on site after confirmation.

Question 1

Why is the oilfield gathering and transportation system severely corroded?

Accepted Answer

The oilfield gathering and transportation pipeline network faces multiple corrosion factors such as CO₂, H₂S, organic acids and sulfate reducing bacteria (SRB) at the same time. In oil wells with high water content (moisture content >60%), a large amount of formation water contains CO₂ and dissolves to form carbonic acid, and H₂S accelerates the cathode reaction. The two work together to make the pipeline corrosion rate much higher than a single corrosion source.

Question 2

What is the key to selecting oilfield corrosion inhibitors?

Accepted Answer

There are three keys to the selection of oilfield corrosion inhibitors: ① Anti-emulsification performance - if the corrosion inhibitor has a strong tendency to emulsify, it will be difficult to dehydrate after filling, causing the water content of the exported oil to exceed the standard; ② CO₂/H₂S dual corrosion inhibition ability - the corrosion inhibition rate of the corrosion inhibitor in simulated formation water needs to be verified; ③ Compatibility with existing wax removal and anti-wax agents to avoid precipitation or failure after mixing. OEM is specially designed for the above pain points.

Question 3

Are imidazoline corrosion inhibitors suitable for oil field scenarios?

Accepted Answer

Suitable, but you need to choose oil field-specific type. Ordinary oil-soluble imidazoline (BXH-102) has a strong emulsification tendency and is not suitable for high water content conditions. OEM is an anti-emulsification imidazoline specially optimized for oilfield gathering and transportation conditions. The emulsification rate is <5% (standard test conditions). It can stably exert a corrosion inhibition effect in high water-cut oil well gathering and transportation pipeline networks with a water content of more than 60%.

Question 4

How to add corrosion inhibitor to high water content oilfield gathering and transportation pipelines?

Accepted Answer

High-water-cut oilfield gathering and transportation pipelines usually adopt the continuous injection method: an injection point is set up at the wellhead or the starting point of the gathering and transportation trunk line, and the agent is continuously injected through a metering pump at a concentration of 50 to 100 mg/L. For branch pipeline networks, batch processing (slug injection) can also be used, with weekly or monthly filling during pigging. The specific dosage needs to be adjusted based on corrosion monitoring data (coat corrosion rate, iron ion content).

Question 5

Can oilfield corrosion inhibitors and wax removers be used at the same time?

Accepted Answer

Yes, but compatibility testing is required. OEM is designed with full consideration of its compatibility with common wax-removing and anti-waxing agents (glycols, solvents). Under normal circumstances, it will not cause precipitation or competitive adsorption failure. It is recommended to mix the two agents in the laboratory according to the actual proportion, observe whether there is layering, turbidity or precipitation, and then apply it on site after confirmation.

Performance Indicators	OEM(Oil Field Special Type)	Ordinary Oil-Soluble Imidazoline
Anti-emulsifying properties	Emulsification rate <5% (standard test)	Emulsification rate 10~30%
Corrosion inhibition efficiency (including CO₂ working condition)	≥88%	≥85%
H₂S inhibit	efficient	efficient
Compatibility with wax removers	After special optimization	Need to test one by one
Moisture content adaptable range	>60% high water content condition	<40% is better

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