Tetrakis hydroxymethyl phosphonium sulfate(THPS) Application in oilfield

75% Tetrakis hydroxymethyl phosphonium sulfate(THPS) CAS:55566-30-8 is a highly efficient multifunctional chemical in oil fields, mainly used for sterilization, corrosion inhibition and scaling. The following is a detailed explanation of its application formula in the oilfield, including the specific formula, use and method and precautions.

1. Application of THPS as fungicide

THPS has a strong killing effect on common oilfield bacteria such as sulfate reducing bacteria (SRB) and saprophytic bacteria (TGB), and it is suitable for water injection system and circulating water system.

prescription:

-THPS (75%): 100-500 ppm (adjusted for bacterial concentration and water quality)

Usage method:

-Pour THPS directly into the water injection system or circulating water system.

-For systems with severe bacterial contamination, the initial concentration can be increased to 500 ppm and can be maintained at 100-200 ppm thereafter.

-Regularly monitor the number of bacteria and adjust the dosage.

Attention:

-THPS effect decreases in high temperature (> 60℃) and alkaline (pH> 9) environments, with pH between 6 and 8 controlled.

-Avoid simultaneous use with oxidative fungicides (e. g. chlorine gas) to reduce the effect.

2. Application of THPS as a corrosion inhibitor

THPS can be mixed with other corrosion inhibitors to inhibit the corrosion of oilfield pipelines and equipment, especially for the corrosion caused by carbon dioxide (CO2) and hydrogen sulfide (H2S).

Prescription:

- THPS（75%):50-200 ppm

-Corrosion inhibitors (such as imidazolines or organoamines): 50-100 ppm

Usage method:

-Add THPS with corrosion inhibitor to water injection system or circulating water system.

-Regularly monitor the corrosion rate and adjust the dosage.

Attention:

-THPS has a corrosion mitigation effect on iron-based materials, but it may be corrosive to copper alloy, so paying attention to material compatibility.

-Compatibility testing to avoid reactions with other chemicals.

3 Application of THPS as descaling agent

THPS can effectively dissolve iron sulfide scale (e. g. FeS) and is suitable for decontamination of oilfield pipelines and equipment.

Prescription:

- THPS（75%）：500-1000 ppm

Usage method:

-Pour THPS solution into the system or equipment to require descaling, circulating or soaking for hours to days.

-Increase THPS concentration to 1000 ppm.

Attention:

-Hydrogen sulfide (H2S) will be produced during descaling process, and protective measures shall be taken.

4. THPS, compound formula

THPS can be combined with other chemicals to form a multifunctional treatment agent, while achieving sterilization, corrosion inhibition and scaling removal.

Prescription:

- THPS（75%）：100-300 ppm

-Funicide (e. g. glutaraldehyde): 50-100 ppm

-Corrosion inhibitor (e. g. organoamines): 50-100 ppm

Usage method:

-Add the compound solution to the water injection system or circulating water system.

-Regularly monitor the sterilization effect, corrosion rate and scaling, and adjust the dosage.

Attention:

-The compatibility test shall be conducted before remixing to ensure that no precipitation or failure occurs between the components.

-The pH value of the compound solution should be controlled between 6 and 8 to ensure the optimal effect of THPS.

Sum up

75% Tetrakis hydroxymethyl phosphonium sulfate (THPS) is widely used in oil fields, mainly for sterilization, corrosion inhibition and descaling. Its formula and use method should be adjusted according to specific needs, pay attention to safe operation and environmental protection. The rational use of THPS effectively improves the operation efficiency of the oilfield system and extends the life of the equipment.