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AssigneeHalliburton Energy Services, Inc.
InventorsB. Raghava Reddy, Larry S. Eoff, Donald L. Whitfill, J. Michael Wilson, Denise Berryhill, Russel M. Fitzgerald, Thomas E. Becker, Jimmie D. Weaver
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Methods of consolidating formations or forming chemical casing or both while drilling are provided. One method of the invention comprises drilling a well bore with a drilling fluid comprised of water, a polymeric cationic catalyst which is adsorbed on weak zones or formations formed of unconsolidated clays, shale, sand stone and the like, a water soluble or dispersible polymer which is cross-linked by a thermoset resin and causes the resin to be hard and tough when cured, a particulate curable solid thermoset resin, a water soluble thermoset resin, and a delayed dispersible acid catalyst for curing the solid and water soluble resins. The drilling fluid forms a filter cake on the walls of the well bore that cures and consolidates the unconsolidated weak zones and formations penetrated by the well bore so that sloughing is prevented and forms a hard and tough cross-linked chemical casing on the walls of the well bore.
A method of consolidating unconsolidated weak zones or formations formed of clays, shale and sand stone while drilling a well bore penetrating the zones or formations to prevent sloughing comprising drilling said well bore with a drilling fluid having a pH in the range of from about 6 to about 10 and comprised of water, a polymeric cationic catalyst capable of accepting and donating protons which is adsorbed on said unconsolidated clays, shale and sand stone, a water soluble or dispersible polymer which is capable of being cross-linked by a thermoset resin and causing said resin to be hard and tough when cured and a water soluble or dispersible thermoset resin which cross-links said polymer, is catalyzed and cured by said catalyst and consolidates said weak zones or formations so that sloughing is prevented.
A method of consolidating unconsolidated weak zones or formations formed of clays, shale, and sand stone to prevent sloughing and forming a chemical casing in a well bore penetrating the weak zones or formations to improve the mechanical strength thereof while drilling the well bore comprising drilling said well bore with a drilling fluid having a pH in the range of from about 6 to about 10 and comprised of water, a polymeric cationic catalyst capable of accepting and donating protons which is adsorbed on said unconsolidated clays, shale and sand stone, a water soluble or dispersible polymer which is capable of being cross-linked by a thermoset resin and causes said resin to be hard and tough when cured, a particulate curable solid thermoset resin, a water soluble thermoset resin and a dispersible delayed acid catalyst for curing said thermoset resins, said drilling fluid forming a filter cake on the walls of said well bore that cures and consolidates said unconsolidated weak zones and formations penetrated by said well bore so that sloughing is prevented and forms a hard and tough cross-linked chemical casing on the walls of said well bore.
A method of consolidating unconsolidated weak zones or formations formed of clays, shales and sand stone while drilling a well bore penetrating the zones or formations to prevent sloughing comprising drilling said well bore with a drilling fluid having a pH of about 8 and comprised of water, a cationic polyethyleneimine catalyst which is adsorbed on said unconsolidated clays, shales and sand stone present in said drilling fluid in an amount in the range of from about 2% to about 10% by weight of water in said drilling fluid, a polysaccharide polymer which is capable of being cross-linked by a thermoset resin and causing the resin to be hard and tough when cured present in an amount in the range of from about 1% to about 10% by weight of water in said drilling fluid and an alkyl ether of a melamine-formaldehyde resin which cross-links said polymer, is catalyzed and cured by said catalyst and consolidates said weak zones or formations so that sloughing is prevented present in said drilling fluid in an amount in the range of from about 20% to about 70% by weight of water in said drilling fluid.
A method of consolidating unconsolidated weak zones or formations formed of clays, shales, and sand stone to prevent sloughing and forming a chemical casing in a well bore penetrating the weak zones or formations to improve the mechanical strength thereof or to provide zonal isolation, or both, while drilling the well bore comprising drilling said well bore with a drilling fluid having a pH of about 8 and comprised of water, a cationic, polyethyleneimine catalyst which is adsorbed on said unconsolidated clays, shales and sand stone and present in an amount in the range of from about 2% to about 10% by weight of water in said drilling fluid, a polysaccharide polymer which is capable of being cross-linked by a thermoset resin and causes the resin to be hard and tough when cured present in said drilling fluid in an amount in the range of from about 1% to about 10% by weight of water in said drilling fluid, a particulate curable solid alkyl ether of melamine-formaldehyde resin present in said drilling fluid in an amount in the range of from about 10% to about 30% by weight of water in said drilling fluid, a water soluble or dispersible alkyl ether of melamine-formaldehyde resin present in said drilling fluid in an amount in the range of from about 20% to about 70% by weight of water in said drilling fluid and a dispersible delayed ammonium chloride acid catalyst for curing said particulate solid resin and said water soluble or dispersible resin present in said drilling fluid in an amount in the range of from about 1% to about 6% by weight of said resins in said drilling fluid, the drilling fluid forming a filter cake on the walls of said well bore that cures and consolidates said unconsolidated weak zones and formations penetrated by said well bore so that sloughing is prevented and forms a hard and tough cross-linked chemical casing on the walls of said well bore.
Dependencies are inferred from the claim text.