RESIN COATED PARTICULATES
Provided according to embodiments of the invention are resin coated particulates for use in oil and gas subterranean extractions. The resin coated particulates comprise a particulate substrate and a resin coating. The resin coating comprises a particulate substrate and a resin coating including epoxy-functional compounds and an aqueous dispersion of an amine functional microgel wherein the amine functional microgel is formed by reacting a chemical excess of a polyfunctional epoxide compound with an amine salt to form a polyfunctional epoxide amine salt reaction intermediate product, and condensing at least some of the unreacted epoxide groups of the polyfunctional epoxide amine salt reaction intermediate product with a polyamine. Methods of treating a subterranean fracture are also provided.
1 . A resin coated particulate for use in oil and gas subterranean extractions comprising
a particulate substrate; and
a resin coating comprising epoxy-functional compounds and an aqueous dispersion of an amine functional microgel wherein the amine functional microgel is formed by reacting a chemical excess of a polyfunctional epoxide compound with an amine salt to form a polyfunctional epoxide amine salt reaction intermediate product, and condensing at least some of the unreacted epoxide groups of the polyfunctional epoxide amine salt reaction intermediate product with a polyamine.
2 . The resin coated particulate of claim 1 wherein the polyfunctional epoxide amine salt reaction intermediate product containing the unreacted epoxy groups is condensed with the polyamine in the ratio of about 0.3:1.0 to about 1.3:1.0 moles of amine to epoxy equivalents.
3 . The resin coated particulate of claim 1 wherein the polyfunctional epoxy compound comprises an epoxy novolac.
4 . The resin coated particulate of claim 3 wherein the epoxy novolac is the glycidyl ether of a phenol-formaldehyde condensate.
5 . The resin coated particulate of claim 1 wherein the polyfunctional epoxy compound is a mixture of the glycidyl polyether of a polyhydric phenol and an epoxy novolac resin.
6 . The resin coated particulate of claim 1 wherein the polyfunctional epoxide compound is a mixture of a glycidyl ether of a dihydric phenol and an epoxy novolac resin reacted in the presence of a polyhydric phenol.
7 . The resin coated particulate of claim 6 wherein the polyhydric phenol is bisphenol A.
8 . The resin coated particulate of claim 1 wherein the polyamine containing one or more primary amine groups per molecule selected from the group consisting of isophorone diamine, m-xylene diamine, diaminocyclohexane, trimethylhexamethylene diamine, polyoxypropylene di and tri-amines, (poly)ethylene amines, methylene dicyclohexyl amine, and aminoethylpiperazine.
9 . The resin coated particulate of claim 1 wherein the particulate substrate has a diameter of 40 to 4000 microns.
10 . The resin coated particulate of claim 1 wherein the epoxy functional compound is an epoxy silane.
11 . The resin coated particulate of claim 10 wherein the epoxy silane is glycidoxy propyl trimethoxy silane.
12 . The resin coated particulate of claim 10 wherein the particulate substrate is sand.
13 . The resin coated particulate of claim 10 wherein the resin coating further comprises an epoxy.
14 . The resin coated particulate of claim 13 wherein the epoxy is a glycidyl ether of a polyhydric phenol and/or a (poly)hydric alcohol having an epoxide equivalent weight of from about 120 to about 700.
15 . The resin coated particulate of claim 13 wherein the epoxy is a diglycidyl ether of bisphenol A.
16 . A method of treating a subterranean fracture comprising injecting into a well resin coated particulate comprising a particulate substrate and a resin coating comprising epoxy-functional compounds and an aqueous dispersion of an amine functional microgel wherein the amine functional microgel is formed by reacting a chemical excess of a polyfunctional epoxide compound with an amine salt to form a polyfunctional epoxide amine salt reaction intermediate product, and condensing at least some of the unreacted epoxide groups of the polyfunctional epoxide amine salt reaction intermediate product with a polyamine.
17 . The method of claim 16 , wherein the particulate substrate has a diameter of 40 to 4000 microns.
18 . The method of claim 16 , wherein the particulate substrate is sand.