Patents Represented by Attorney G. H. Korfhage
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Patent number: 4237974Abstract: Improved fluid loss control is realized in an acidizing treatment of a subterranean formation, of the type wherein a gelled pad fluid is injected ahead of an acidizing fluid, by dissolving an effective amount of an inorganic water soluble metal halide or sulfate salt in the pad fluid and injecting said salt containing pad fluid ahead of the acid.Type: GrantFiled: May 9, 1978Date of Patent: December 9, 1980Assignee: The Dow Chemical CompanyInventor: Gary A. Scherubel
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Patent number: 4237975Abstract: Improved fluid loss control is realized in an acidizing treatment of a subterranean formation of the type using foamed acid, particularly in a foamed fracture acidizing type treatment, by injecting a gelled, substantially unfoamed fluid as a pad ahead of the foamed acid. I.Type: GrantFiled: April 11, 1978Date of Patent: December 9, 1980Assignee: The Dow Chemical CompanyInventor: Gary A. Scherubel
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Patent number: 4189002Abstract: A zone of a subterranean formation penetrated by a well bore is permanently plugged by injecting a liquid resin system containing at least one thermosetting resin and at least one curing agent or catalyst therefor into the formation and injecting into the wellbore following the resin system, a second liquid containing at least one chain stopping compound to react with one component in the resin system to prevent any of the resin system remaining in the well bore from crosslinking to a sufficient crosslink density to form a solid in the wellbore. Preferably, the second liquid also contains a fluid loss additive to minimize loss of the second liquid from the wellbore to the formation. The method permits a zone to be plugged off and abandoned without the need to erect a drilling rig to drill out excess plugging material remaining in the wellbore.Type: GrantFiled: July 7, 1978Date of Patent: February 19, 1980Assignee: The Dow Chemical CompanyInventor: Robert C. Martin
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Patent number: 4174283Abstract: The reaction product of a hydroxy ether and a pentavalent phosphorus compound with a short chain and/or long chain alcohol can be employed to gel organic liquids by mixing the reaction product with an organic liquid in the presence of certain aluminum activator compounds.Type: GrantFiled: July 15, 1977Date of Patent: November 13, 1979Assignee: The Dow Chemical CompanyInventor: Thomas J. Griffin, Jr.
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Patent number: 4163079Abstract: Coal and other particulate can be transported on a conveyor belt exposed to winter weather conditions with reduced slippage of the particulate on the belt surface by periodically treating the belt surface with from about 0.001 to about 0.005 gallons per square foot of belt surface (0.04-0.2 liters/sq. meter) of a composition consisting substantially of water soluble components comprising (A) a water soluble polyhydroxy compound or monoalkyl ether thereof, and (B) a water soluble organic nonvolatile compound having at least one hydrophilic group, (A) being different from (B). The treating composition may also include a small amount of a polydimethyl siloxane if desired.Type: GrantFiled: December 14, 1977Date of Patent: July 31, 1979Assignee: The Dow Chemical CompanyInventor: Frank J. Beafore
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Patent number: 4162347Abstract: Coal and other particulate can be transported on a conveyor belt exposed to winter weather conditions with reduced slippage of the particulate on the belt surface by periodically treating the belt surface with from about 0.001 to about 0.005 gallons per square foot of belt surface (0.04-0.4 liters/sq. meter) of a composition containing a small amount of a dimethyl polysiloxane with the balance consisting substantially of water soluble components comprising (A) a water soluble polyhydroxy compound or monoalkyl ether thereof, and (B) a water soluble organic nonvolatile compound having at least one hydrophilic group, (A) being different from (B).Type: GrantFiled: December 14, 1977Date of Patent: July 24, 1979Assignee: The Dow Chemical CompanyInventor: Carl T. Montgomery
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Patent number: 4160483Abstract: The permeability of the prop pack in a subterranean fracture containing a propping agent is improved by contacting the propping agent with fluoboric acid. The fluoboric acid slowly forms hydrolysis products, including hydrofluoric acid and hydroxyfluoboric acid, which react with and stabilize clays and other fines in the prop pack, thereby improving its permeability. Because the fluoboric acid hydrolyzes slowly, it can be injected deep into the fracture extremities before significant spending of the acid occurs.Type: GrantFiled: July 21, 1978Date of Patent: July 10, 1979Assignee: The Dow Chemical CompanyInventors: Ronnie L. Thomas, Frederick A. Suhy
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Patent number: 4157648Abstract: Disclosed is a composition and method for the inflation of passive restraint systems, i.e., crash bags. The method, which uses the gases produced by the ignition of certain alkali metal azides in combination with certain metal halides for inflation of the bag, provides a non-toxic gas for inflation. Use of sufficient metal halide to provide halogen in an amount at least stoichiometric with the alkali metal prevents the formation of free alkali metal, the latter considered to be toxic and to present an unsuitable material in passive restraint systems.Type: GrantFiled: June 12, 1975Date of Patent: June 12, 1979Assignee: The Dow Chemical CompanyInventors: Richard L. Brennan, George A. Lane
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Patent number: 4153649Abstract: The reaction product of a hydroxy ether and a pentavalent phosphorus compound with a short chain and/or long chain alcohol can be employed to gel organic liquids by mixing the reaction product with an organic liquid in the presence of a multivalent metal cation.Type: GrantFiled: July 15, 1977Date of Patent: May 8, 1979Assignee: The Dow Chemical CompanyInventor: Thomas J. Griffin, Jr.
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Patent number: 4153066Abstract: The reaction product of a hydroxy ether and a pentavalent phosphorus compound with a short chain and/or long chain alcohol can be employed to gel organic liquids by mixing the reaction product with an organic liquid in the presence of certain aluminum activator compounds.Type: GrantFiled: July 15, 1977Date of Patent: May 8, 1979Assignee: The Dow Chemical CompanyInventor: Thomas J. Griffin, Jr.
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Patent number: 4143715Abstract: An improved method is disclosed for bringing a well under control by injecting a well-controlling fluid into an adjacent well, through the subterranean formation, and thence into the out-of-control well, wherein the improvement lies in a particular sequence of steps whereby fluid communication between the boreholes is established or improved.Type: GrantFiled: January 6, 1978Date of Patent: March 13, 1979Assignee: The Dow Chemical CompanyInventor: Joseph P. Pavlich
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Patent number: 4140640Abstract: A subterranean formation is acidized with an emulsion comprising an aqueous acidizing solution, an oil, an effective amount each of an alkyl C.sub.8 to C.sub.18 primary fatty amine and at least one diethanolamide of at least one C.sub.8 to C.sub.18 fatty acid.Type: GrantFiled: July 6, 1977Date of Patent: February 20, 1979Assignee: The Dow Chemical CompanyInventor: Gary A. Scherubel
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Patent number: 4137970Abstract: A tool, e.g., a well packer, for restricting the flow of fluid through an annulus defined by the interior walls of a fluid conduit, e.g., well casing, and the exterior of a tubular member, e.g., the packer mandrel, is disclosed. The novelty of the present invention lies in the deformable packer element of such a tool, wherein in lieu of rubber, a chemically activated material which expands upon contact with fluid in the conduit is employed to effect the desired seal. A method of using such a tool is also disclosed.Type: GrantFiled: April 20, 1977Date of Patent: February 6, 1979Assignee: The Dow Chemical CompanyInventors: George P. Laflin, Clarence J. Durborow
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Patent number: 4131578Abstract: An aqueous hydraulic cement slurry is provided which has low fluid loss properties at elevated temperatures. In addition to water and a hydraulic cement the hydraulic cement slurry contains a polyamine compound; a lignoamine and/or lignosulfonate; a borate ion releasing compound; and a carbonate and/or bicarbonate.Type: GrantFiled: August 12, 1977Date of Patent: December 26, 1978Assignee: The Dow Chemical CompanyInventors: Oliver W. Crinkelmeyer, Earl F. Morris
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Patent number: 4127174Abstract: Fluid loss control for aqueous chemical washes of the type used in well cementing is provided by incorporating in the wash, an effective amount of the oil-soluble resin mixture described in U.S. Pat. No. 3,891,566.Type: GrantFiled: June 17, 1977Date of Patent: November 28, 1978Assignee: The Dow Chemical CompanyInventors: James R. Sharpe, Dustin L. Free
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Patent number: 4125160Abstract: An aqueous hydraulic cement slurry is provided which has low fluid loss properties at elevated temperatures. In addition to water and a hydraulic cement the hydraulic cement slurry contains a polyamine compound; a lignoamine and/or lignosulfonate; a borate ion releasing compound; and a carbonate and/or bicarbonate.Type: GrantFiled: August 12, 1977Date of Patent: November 14, 1978Assignee: The Dow Chemical CompanyInventors: Oliver W. Crinkelmeyer, Earl F. Morris
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Patent number: 4108782Abstract: A foaming and silt suspending agent is disclosed containing (A) at least one alkyltrimethylammonium chloride; (B) an amine oxide selected from the group consisting of bis-(2-hydroxyethyl) cocoamine oxide, dimethylhexadecylamine oxide, and dimethyl-hydrogenated tallowamine oxide; (C) an adduct of trimethyl-1-heptanol plus seven moles of ethylene oxide; and (D) a perfluorinated compound corresponding to the formula ##STR1## wherein A.sup.- is Cl.sup.-, I.sup.-, F.sup.- or Br.sup.-, preferably I.sup.-. The agent is particularly useful in a variety of aqueous based fluids of the type used in treating subterranean formations, including fluids containing other cationic additives such as certain acid inhibitors and clay stabilization agents which tend to impair the effectiveness of prior art agents.Type: GrantFiled: April 27, 1977Date of Patent: August 22, 1978Assignee: The Dow Chemical CompanyInventor: James L. Thompson
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Patent number: 4108930Abstract: A high-alumina cement composition is disclosed which has thermal stability over a wide temperature range and which develops strength at an early age. The cement composition comprises a high-alumina cement, a halide salt and calcium sulfate. This composition when added to water provides a hydraulic cement composition which can be employed in environments subject to wide temperature fluctuations below and above freezing (e.g. 32.degree. F).Type: GrantFiled: July 1, 1974Date of Patent: August 22, 1978Assignee: The Dow Chemical CompanyInventors: Oliver W. Crinkelmeyer, Earl F. Morris
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Patent number: 4074760Abstract: An aqueous based slurry is disclosed containing an aqueous carrier fluid, an epoxy resin, a curing agent for the resin, a solvent for said resin and curing agent, a finely divided particulate material, a particular quaternary ammonium halide, and a coupling agent to promote bonding of the resin to the particulate. Optionally, the slurry may contain a thickening or gelling agent for the water to enhance its solids carrying capacity and an agent to break the gel after its purpose has been served. The slurry, suitable for use in placing a permeable, consolidated gravel pack adjacent an incompetent subterranean formation, is characterized in that it does not require an oil-based carrier and also in that it can easily be prepared in the field by adding the particulate directly to the aqueous carrier without precoating the particulate with the resin.Type: GrantFiled: November 1, 1976Date of Patent: February 21, 1978Assignee: The Dow Chemical CompanyInventors: Claude T. Copeland, Vernon G. Constien
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Patent number: 4054461Abstract: A cement composition is provided containing portland cement; calcium sulfate hemihydrate; an alkali metal nitrate; one or more retarders selected from the group consisting of a low molecular weight hydroxypolycarboxylic acid and sodium, potassium, and lithium salts thereof, and an alkaline hexametaphosphate; and as optional ingredients, calcium chloride and/or a condensation product of mononaphthalene sulfonic acid and formaldehyde; said ingredients being present in amounts effective to provide a cement which will set within a desired period of time at temperatures below about 80.degree. F down to below freezing, e.g. 32.degree. F, to provide a monolithic mass having adequate strength.Type: GrantFiled: January 28, 1977Date of Patent: October 18, 1977Assignee: The Dow Chemical CompanyInventor: Robert C. Martin