CONQOR 404 WH phosphate-based corrosion inhibitor | SLB


Phosphate-based corrosion inhibitor

Schlumberger Oilfield Services

An all-purpose, water-soluble organophosphate compound.

How it improves wells

At relatively low concentrations, the CONQOR 404 WH™ inhibitor is particularly effective against oxygen corrosion in aerated muds used in underbalanced drilling operations and low solids, nondispersed water-base fluids.

  • Compatible with anionic foamers
  • Highly effective against oxygen corrosion caused by dissolved oxygen
  • Low toxicity
  • Minimum impact on fluids rheology
  • Effective in
    • fresh to saturated saltwater
    • aerated fluids such as those used in air-drilling operations
    • temperatures exceeding 350 degF [177 degC].

CONQOR 404 WH is a mark of M-I L.L.C., an SLB company.


How it works

Typical recommended treatment of CONQOR 404 WH inhibitor is 2.5 galUS for every 100 barrels [0.6 L/m3] of makeup fluid depending on anticipated conditions, other chemicals used in the system, and the corrosive environment, i.e., salinity, pH, temperature, oxygen content, and acid gases. If the corrosion rate is unacceptably high, the concentration should be increased to at least 7 galUS/100 bbl [1.7 L/m3]. For aerated systems, an initial treatment of 12 galUS/100 bbl [2.9 L/m3] is recommended.

The product should be evenly dispersed throughout the circulating mud system and can be added either through the chemical barrel or directly to the mud pits wherever good agitation occurs.

The corrosion rates should be monitored at all times either directly or with corrosion coupons and treatments should be adjusted according to their analysis. A good corrosion-control program includes a thorough makeup-water analysis, chemical treatments for corrosive contaminants, and an adequate bacterial control for systems that contain biodegradable additives.

Typical Physical Properties
Physical appearance Clear yellow liquid
Specific gravity 1.43–1.44
pH of 5% solution 7–8.5
Flash point >200 degF [>93 degC]
Pour point –10 degF [–23 degC]

Situations where it should not be used

  • Should not be used in packer fluids or other situations where the fluid will not be circulated nor on racked pipe
  • Less effective when calcium exceeds 200 mg/L, increased product concentration required
  • Not compatible with formate brines or fluids

Toxicity and handling

Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the Safety Datasheet.

Special packaging and storage instructions

CONQOR 404 WH inhibitor is packaged in 55-galUS [208-L] epoxy-lined steel drums and in 5-galUS [19-L] plastic pails. It is not a Department of Transportation-regulated material. Store in a dry, well-ventilated area. Keep container closed. Keep away from heat, sparks, and flames. Store away from incompatibles. Follow safer warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.