# US 2013/0153225 A1 · Compositions and Methods for Treatment of Well Bore Tar > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0153225 A1 - Document ID: US20130153225A1 - Status: Published application - Kind: A1 - Application number: 13/329,016 - Filed: 2011-12-16 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: Halliburton Energy Services, Inc. - Inventors: Philip Wayne Livanec; Greg PJ Perez - Web page: https://patentgrep.com/patent/US20130153225A1 ## CPC - C09K 8/524: organic depositions, e.g. paraffins or asphaltenes - C09K 8/04: Aqueous well-drilling compositions - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract Of the many compositions and methods provided herein, one method includes contacting tar resident in a well bore with a tar stabilizer comprising an acrylonitrile-butadiene copolymer; and allowing the tar stabilizer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. ## Claims ### Claim 1 A method for treatment of well bore tar comprising: contacting tar resident in a well bore with a tar stabilizer comprising an acrylonitrile-butadiene copolymer; and allowing the tar stabilizer to interact with the tar to at least partially reduce the tendency of the tar to adhere to a surface. ### Claim 2 (depends on 1) The method of claim 1, wherein the acrylonitrile-butadiene copolymer is carboxylated. ### Claim 3 (depends on 1) The method of claim 1, wherein the acrylonitrile-butadiene copolymer further comprises a styrene. ### Claim 4 (depends on 3) The method of claim 3, wherein the acrylonitrile-butadiene copolymer comprises an additional monomer in an amount of less than about 1% by weight. ### Claim 5 (depends on 1) The method of claim 1, wherein the acrylonitrile-butadiene copolymer comprises acrylonitrile in an amount of about 50% to about 95% by weight of the copolymer, butadiene in an amount of about 5% to about 50% by weight of the copolymer, and styrene in an amount up to about 25% by weight of the copolymer. ### Claim 6 (depends on 1) The method of claim 1, wherein the acrylonitrile-butadiene copolymer is an emulsion-polymerized acrylonitrile-butadiene copolymer, wherein the method further comprises dispersing a latex emulsion comprising the emulsion-polymerized acrylonitrile-butadiene copolymer in an aqueous fluid to form a treatment fluid, and introducing the treatment fluid into the well bore. ### Claim 7 (depends on 1) The method of claim 1, further comprising dispersing the acrylonitrile-butadiene copolymer as a powder in an aqueous fluid to form a treatment fluid; and introducing the treatment fluid into the well bore. ### Claim 8 (depends on 1) The method of claim 1, wherein the tar stabilizer is present in a treatment fluid in an amount of about 1% to about 70% by volume of the treatment fluid. ### Claim 9 (depends on 1) The method of claim 1, wherein the tar stabilizer is present in a treatment fluid in an amount of about 1% to about 10% by volume of the treatment fluid. ### Claim 10 (depends on 1) The method of claim 1, wherein the tar stabilizer is present in a treatment fluid, the treatment fluid further comprising a viscosifier selected from the group consisting of a colloidal agent, a clay, a polymer, guar gum, an emulsion-forming agent, diatomaceous earth, a biopolymer, a synthetic polymer, chitosan, a starch, a gelatin, and any mixture thereof. ### Claim 11 (depends on 1) The method of claim 1, wherein the tar stabilizer is present in a treatment fluid, the treatment fluid further comprising at least one additive selected from the group consisting of a salt, a surfactant, a fluid-loss-control additive, a gas, nitrogen, carbon dioxide, a surface-modifying agent, a tackifying agent, a foamer, a corrosion inhibitor, a scale inhibitor, a catalyst, a clay-control agent, a biocide, a friction reducer, an antifoam agent, a bridging agent, a dispersant, a flocculant, hydrogen sulfide scavenger, carbon dioxide scavenger, an oxygen scavenger, a lubricant, a viscosifier, a breaker, a weighting agent, barite, a relative-permeability modifier, a resin, a particulate material, a proppant particulate, a wetting agent, a coating-enhancement agent, and any combination thereof. ### Claim 12 (depends on 1) The method of claim 1, wherein the tar stabilizer is present in a treatment fluid, and wherein the method further comprises comprising circulating the treatment fluid past a drill bit to remove drill cuttings from the drill bit. ### Claim 13 (depends on 1) The method of claim 1, wherein the tar stabilizer is present in a treatment fluid, and wherein the method further comprises comprising introducing the treatment into the well bore as a pill for a spot treatment of the well bore tar. ### Claim 14 (depends on 1) The method of claim 1, further comprising monitoring the concentration of the tar modifier in a treatment fluid. ### Claim 15 A method for treatment of well bore tar comprising: using a drill bit to enlarge a well bore in a subterranean formation comprising tar; and circulating a drilling fluid past the drill bit to remove cuttings from the drill bit, wherein the drilling fluid comprises an aqueous fluid and a tar stabilizer comprising an acrylonitrile-butadiene copolymer. ### Claim 16 (depends on 15) The method of claim 15, wherein the subterranean formation comprises tar sands that comprise the tar. ### Claim 17 (depends on 15) The method of claim 15, wherein the acrylonitrile-butadiene copolymer is carboxylated. ### Claim 18 (depends on 15) The method of claim 15, wherein the acrylonitrile-butadiene copolymer further comprises a styrene. ### Claim 19 (depends on 18) The method of claim 18, wherein the acrylonitrile-butadiene copolymer comprises an additional monomer in an amount of less than about 1% by weight. ### Claim 20 (depends on 15) The method of claim 15, wherein the acrylonitrile-butadiene copolymer comprises acrylonitrile in an amount of about 50% to about 95% by weight of the copolymer, butadiene in an amount of about 5% to about 50% by weight of the copolymer, and a styrene in an amount up to about 25% by weight of the copolymer. ### Claim 21 (depends on 15) The method of claim 15, wherein the acrylonitrile-butadiene copolymer is an emulsion-polymerized acrylonitrile-butadiene copolymer, and the method further comprises dispersing a latex emulsion comprising the emulsion-polymerized acrylonitrile-butadiene copolymer in the aqueous fluid to form the treatment fluid. ### Claim 22 (depends on 15) The method of claim 15, wherein the tar stabilizer is present in the drilling fluid in an amount of about 1% to about 10% by volume of the drilling fluid. ### Claim 23 (depends on 15) The method of claim 15, wherein the drilling fluid further comprises a weighting agent. ### Claim 24 A treatment fluid comprising: an aqueous fluid; and an acrylonitrile-butadiene copolymer.