Gelled water epoxy sand consolidation system
AssigneeHalliburton Company
InventorJoseph R. Murphey
Life of this patent
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Abstract
Particular aqueous gels, epoxy resin compositions and optional additives such as diluents, retarders and accelerators are described which produce a practical composition and method for in situ sand consolidation and gravel packing by which a resin coated sand is positioned in a desired location and cured by an internal catalyst to form a porous permeable or plugged consolidated mass.
Claims38
A process for coating silica particles with epoxy resin in the presence of an aqueous fluid comprising mixing a neutral polysaccharide polymer having a molecular weight of about 100,000-2,000,000 with said aqueous fluid to gel the fluid and said polymer having water solubility sufficient to increase the viscosity of water to at least about 30 centipoise;
- adding a mixture of surfactants to said aqueous fluid in an amount at least sufficient to coat onto said silica surfaces, said mixture comprising at least one cationic surfactant with limited water solubility and at least one water miscible surfactant which is nonionic, anionic, neutralized cationic or a mixture thereof;
- mixing said silica particles with said gelled aqueous fluid;
- mixing said epoxy resin composition with the said gelled aqueous fluid;
- and coating said epoxy resin composition onto said silica particles suspended in said gelled aqueous fluid by mixing in the presence of said mixture of surfactants.
A process for forming a porous permeable channel in a formation comprising mixing a water soluble, neutral cellulose polymer having a molecular weight of about 100,000-2,000,000 with an aqueous fluid to gel the fluid to a viscosity of at least about 30 centipoise;
- adding a mixture of surfactants to said aqueous fluid in an amount at least sufficient to coat onto particulate material surfaces, said surfactant mixture comprising at least one cationic surfactant with limited water solubility and at least one water miscible surfactant which is nonionic, anionic or a combination thereof;
- mixing said particulate material having silica surfaces with said gelled aqueous fluid;
- mixing an epoxy resin composition with said gelled aqueous fluid;
- mixing epoxy resin and particulate material in gelled aqueous fluid to coat said particulate material with said epoxy resin;
- and placing said epoxy resin coated particulate material in the desired location to form said porous permeable channel.
A process for filling a void with a consolidatable epoxy resin coated silica particles in the presence of an aqueous fluid comprising mixing a water soluble, neutral cellulose polymer having a molecular weight of about 100,000-2,000,000 with an aqueous fluid to gel the fluid to a viscosity of at least about 30 centipoise;
- adding a mixture of surfactants to said aqueous fluid in an amount at least sufficient to coat onto said silica surfaces, said surfactant mixture comprising at least one cationic surfactant with limited water solubility and at least one water miscible surfactant which is nonionic, aionic, neutralized cationic or a combination thereof;
- mixing said silica particles with said gelled aqueous fluid;
- mixing said epoxy resin composition with said gelled aqueous fluid;
- and placing said mixture of resin coated silica particles in said gelled aqueous fluid in said void.
In a process for coating epoxy resin onto silica sand particles, the step of contacting in the presence of a blend of surfactants the sand particles with said epoxy resin suspended in an aqueous fluid gelled with a water soluble hydroxyethylcellulose polymer having a molecular weight of about 100,000-2,000,000;
- said blend of surfactants comprising a cationic surfactant with limited water solubility and a minor amount of water miscible surfactant which is nonionic, anionic, neutralized cationic or a mixture thereof and said surfactants being present in an amount at least sufficient to coat onto said silica surfaces.
In a process for gravel packing a zone in a subterranean formation intersected by a well using epoxy coated silica particles, the step of suspending said silica particles in a gelled aqueous fluid containing a water soluble neutral polysaccharide polymer having a molecular weight of about 100,000-2,000,000 and coating the suspended silica particles with epoxy resin in said gelled aqueous fluid in the presence of a blend of surfactants comprising a cationic surfactant with limited water solubility and a minor amount of water miscible surfactant which is nonionic, anionic, neutralized cationic or a mixture thereof with said surfactants being present in an amount at least sufficient to coat onto said silica surfaces.
A process for coating silica particles with epoxy resin in the presence of an aqueous fluid comprising mixing a water soluble neutral polysaccharide polymer having a molecular weight of about 100,000-2,000,000 with said aqueous fluid to gel the fluid and increase the viscosity to at least about 30 centipoise;
- adding a mixture of surfactants to said aqueous fluid in an amount at least sufficient to coat onto said silica surfaces, said mixture comprising at least one cationic surfactant with limited water solubility and at least one water miscible surfactant which is nonionic, anionic, neutralized cationic or a mixture thereof;
- mixing said epoxy resin composition with the said gelled aqueous fluid;
- and coating said silica particles with said epoxy resin composition suspended in said gelled aqueous fluid by contacting said silica particles with said epoxy resin composition in the presence of said mixture of surfactants.
Dependencies are inferred from the claim text.