Microencapsulated oil field chemicals
First Claim
Patent Images
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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Accused Products
Abstract
Gelatin capsules containing oil field chemicals, preferably weighted with a heavy metal compound, are made more stable under certain conditions by the incorporation of a strong chelating agent. The microcapsules can provide an extended treatment period since many materials that would damage the microcapsules are controlled by the chelating agent.
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Citations
1 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:
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(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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Specification