Drilling fluid component
AssigneeHalliburton Energy Services, Inc.
InventorsFrank Zamora, Larry S. Eoff, Eldon Dwyann Dalrymple, B. Raghava Reddy
Life of this patent
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Abstract
A method and composition is provided for a relative permeability modifying polymer for use with drilling fluids that comprises a water soluble polymer formed from a hydrophobic or hydrophobically modified hydrophilic monomer and a hydrophilic monomer. In an alternative embodiment, a method is provided for producing a water soluble polymer formed from a hydrophilic monomer for use as a relative permeability modifying polymer.
Claims26
A method of reducing the water permeability of a well bore during the drilling phase, comprising:
- providing a polymer comprising:
- (i) a monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, alkyl acrylamides, alkyl methacrylamides, alkyl dimethylammoniumethyl methacrylate halides, and alkyl dimethylammonium propylmethacrylamide halides, wherein the alkyl groups have from about 4 to about 22 carbon atoms;
- and
- (ii) a monomer selected from the group consisting of acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, N,N-dimethylacrylamide, vinyl pyrrolidone, dimethylaminoethyl methacrylate, acrylic acid, dimethylaminopropylmethacrylamide, trimethylammoniumethyl methacrylate chloride, methacrylamide and hydroxyethyl acrylate;
- and
- placing the polymer down hole, thereby reducing the water permeability of the well bore.
A drilling fluid additive, comprising:
- a polymer comprising:
- (i) a monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, alkyl acrylamides, alkyl methacrylamides, alkyl dimethylammoniumethyl methacrylate halides, and alkyl dimethylammonium propylmethacrylamide halides, wherein the alkyl groups have from about 4 to about 22 carbon atoms;
- and
- (ii) a monomer selected from the group consisting of acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, N,N-dimethylacrylamide, vinyl pyrrolidone, dimethylaminoethyl methacrylate, acrylic acid, dimethylaminopropylmethacrylamide, trimethylammoniumethyl methacrylate chloride, methacrylamide and hydroxyethyl acrylate.
A method of reducing the water permeability of a well bore during the drilling phase, comprising:
- providing a polymer comprising:
- (i) a monomer selected from the group consisting of alkyl acrylates, alkyl methacrylates, alkyl acrylamides, alkyl methacrylamides, alkyl dimethylammoniumethyl methacrylate halides, and alkyl dimethylammonium propylmethacrylamide halides, wherein the alkyl groups have from about 4 to about 22 carbon atoms;
- and
- (ii) a monomer selected from the group consisting of acrylamide, 2-acrylamido-2-methyl propane sulfonic acid, N,N-dimethylacrylamide, vinyl pyrrolidone, dimethylaminoethyl methacrylate, acrylic acid, dimethylaminopropylmethacrylamide, trimethylammoniumethyl methacrylate chloride, methacrylamide and hydroxyethyl acrylate, wherein the mole ratio of the monomer of (i) to the monomer of (ii) in the polymer is in the range of from about 10:90 to 0.02:99.98;
- and placing the polymer down hole, thereby reducing the water permeability of the well bore.
A method of forming a relative permeability modifying polymer comprising:
- polymerizing a hydrophilic monomer to form a homopolymer;
- and
- partially quaternizing the homopolymer with an alkyl halide to form a copolymer.
Dependencies are inferred from the claim text.