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US 8,183,184 B2Granted
Polyelectrolyte complexes for oil and gas applications
AssigneeUniversity of Kansas
InventorsCory Berkland, Mary Cordova, Jenn-Tai Liang, G. Paul Willhite
Life of this patent
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Abstract
A polyelectrolyte complex for the controlled release of an oil and gas field chemical selected from the group consisting of (a) a gel-forming or cross-linking agent, (b) a scale inhibitor, (c) a corrosion inhibitor, (d) an inhibitor of asphaltene or wax deposition, (e) a hydrogen sulfide scavenger, (f) a hydrate inhibitor, (g) a breaking agent, and a surfactant.
Claims37
A composition for controlling the release of an oil and gas field chemical comprising:
- a polyanion and a polycation forming a polyelectrolyte complex, said polyelectrolyte complex having a polymeric core and polymeric shell, and an oil and gas field chemical associated with said polyelectrolyte complex, wherein said composition is injected into an oil and gas well for the controlled release of the oil and gas field chemical from said complex,
- and wherein said oil and gas field chemical is selected from the group consisting of a scale inhibitor;
- which is selected from the group consisting polyvinyl sulphonic acid, hexamethylene diamine tetrakis (methylene phosphonic acid), diethylene triamine tetra (methylene phosphonic acid), diethylene triamine penta (methylene phosphonic acid), bis-hexamethylene triamine pentakis (methylene phosphonic acid), phosphino carboxylic acid, diglycol amine phosphonate, 1-hydroxyethylidene, 1,1-diphosphonate, and bisaminoethylether phosphonate;
- and their alkali metal salts;
- and wherein said polyelectrolyte complex is a nanoparticle having a particle size less than about 5000 nm.
2 more elements
A method for producing a composition for the delayed release of an oil and gas field chemical comprising:
- mixing a polyanion, a polycation, and an oil and gas field chemical together in solution;
- ceasing mixing to form a composition comprising a polyelectrolyte complex having a polymeric core and polymeric shell, said polyelectrolyte complex comprising said polyanion and said polycation and said oil and gas field chemical associated with said polyelectrolyte complex;
- for the delayed release of the oil and gas field chemical from said complex,
- and wherein said oil and gas field chemical is selected from the group consisting of a scale inhibitor;
- which is selected from the group polyvinyl sulphonic acid, hexamethylene diamine tetrakis (methylene phosphonic acid), diethylene triamine tetra (methylene phosphonic acid), diethylene triamine penta (methylene phosphonic acid), bis-hexamethylene triamine pentakis (methylene phosphonic acid), phosphino carboxylic acid, diglycol amine phosphonate, 1-hydroxyethylidene, 1,1-diphosphonate, and bisaminoethylether phosphonate;
- and their alkali metal salts;
- and wherein said polyelectrolyte complex is a nanoparticle having a particle size less than about 5000 nm.
4 more elements
A composition for controlling the release of an oil and gas field chemical comprising:
- a polyanion and a polycation forming a polyelectrolyte complex, said polyelectrolyte complex having a polymeric core and polymeric shell, and an oil and gas field chemical associated with said polyelectrolyte complex, wherein said composition is injected into an oil and gas well for the controlled release of the oil and gas field chemical from said complex,
- wherein said oil and gas field chemical is a gel-forming agent, and wherein said gel-forming agent is a chromium containing compound selected from the group consisting of chromium nitrate, chromium chloride, chromium citrate, chromium acetate, and chromium propionate;
- and wherein said polyelectrolyte complex is a nanoparticle having a particle size less than about 5000 nm.
A method for producing a composition for the delayed release of an oil and gas field chemical comprising:
- mixing a polyanion, a polycation, and an oil and gas field chemical together in solution;
- ceasing mixing to form a composition comprising a polyelectrolyte complex having a polymeric core and polymeric shell, said polyelectrolyte complex comprising said polyanion and said polycation and said oil and gas field chemical associated with said polyelectrolyte complex;
- and wherein said oil and gas field chemical is a gel forming agent which is a chromium containing compound selected from the group consisting of chromium nitrate, chromium chloride, chromium citrate, chromium acetate, and chromium propionate;
- and wherein said polyelectrolyte complex is a nanoparticle having a particle size less than about 5000 nm.
1 more element
Dependencies are inferred from the claim text.