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Microencapsulated oil field chemicals

  • US 5,922,652 A
  • Filed: 05/05/1992
  • Issued: 07/13/1999
  • Est. Priority Date: 05/05/1992
  • Status: Expired due to Term
First Claim
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1. Microcapsule containing from about 5% to about 80% of oil field chemical, wherein said oil field chemical is selected from the group consisting of:

  • (A) scale inhibitor;

    (B) corrosion inhibitor;

    (C) biocide;

    (D) chemicals to limit the presence of solid hydrocarbons;

    (E) scavenger for H2 S;

    (F) scavenger for O2 ;

    (G) demulsifier;

    (H) clay stabilizer;

    (I) surfactant;

    (J) acidizing agent; and

    (K) mixtures thereof;

    said microcapsules having a wall being formed by coacervation at a pH of rom about 3.5 to about 6, and said microcapsules being stabilized in brine solution containing about 20,000 mg/l chloride ion by incorporation of from about 3% to about 12% of a strong chelating agent selected from the acids and salts of the group consisting of;

    material having the formula;

    ##STR5## and mixtures thereof, and wherein said microcapsule also comprise a weighting agent at a level of from about 5% to about 75%.

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