Patents Represented by Attorney G. H. Korfhage
  • Patent number: 4237974
    Abstract: 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: Grant
    Filed: May 9, 1978
    Date of Patent: December 9, 1980
    Assignee: The Dow Chemical Company
    Inventor: Gary A. Scherubel
  • Patent number: 4237975
    Abstract: 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: Grant
    Filed: April 11, 1978
    Date of Patent: December 9, 1980
    Assignee: The Dow Chemical Company
    Inventor: Gary A. Scherubel
  • Patent number: 4189002
    Abstract: 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: Grant
    Filed: July 7, 1978
    Date of Patent: February 19, 1980
    Assignee: The Dow Chemical Company
    Inventor: Robert C. Martin
  • Patent number: 4174283
    Abstract: 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: Grant
    Filed: July 15, 1977
    Date of Patent: November 13, 1979
    Assignee: The Dow Chemical Company
    Inventor: Thomas J. Griffin, Jr.
  • Patent number: 4163079
    Abstract: 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: Grant
    Filed: December 14, 1977
    Date of Patent: July 31, 1979
    Assignee: The Dow Chemical Company
    Inventor: Frank J. Beafore
  • Patent number: 4162347
    Abstract: 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: Grant
    Filed: December 14, 1977
    Date of Patent: July 24, 1979
    Assignee: The Dow Chemical Company
    Inventor: Carl T. Montgomery
  • Patent number: 4160483
    Abstract: 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: Grant
    Filed: July 21, 1978
    Date of Patent: July 10, 1979
    Assignee: The Dow Chemical Company
    Inventors: Ronnie L. Thomas, Frederick A. Suhy
  • Patent number: 4157648
    Abstract: 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: Grant
    Filed: June 12, 1975
    Date of Patent: June 12, 1979
    Assignee: The Dow Chemical Company
    Inventors: Richard L. Brennan, George A. Lane
  • Patent number: 4153066
    Abstract: 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: Grant
    Filed: July 15, 1977
    Date of Patent: May 8, 1979
    Assignee: The Dow Chemical Company
    Inventor: Thomas J. Griffin, Jr.
  • Patent number: 4153649
    Abstract: 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: Grant
    Filed: July 15, 1977
    Date of Patent: May 8, 1979
    Assignee: The Dow Chemical Company
    Inventor: Thomas J. Griffin, Jr.
  • Patent number: 4143715
    Abstract: 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: Grant
    Filed: January 6, 1978
    Date of Patent: March 13, 1979
    Assignee: The Dow Chemical Company
    Inventor: Joseph P. Pavlich
  • Patent number: 4140640
    Abstract: 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: Grant
    Filed: July 6, 1977
    Date of Patent: February 20, 1979
    Assignee: The Dow Chemical Company
    Inventor: Gary A. Scherubel
  • Patent number: 4137970
    Abstract: 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: Grant
    Filed: April 20, 1977
    Date of Patent: February 6, 1979
    Assignee: The Dow Chemical Company
    Inventors: George P. Laflin, Clarence J. Durborow
  • Patent number: 4131578
    Abstract: 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: Grant
    Filed: August 12, 1977
    Date of Patent: December 26, 1978
    Assignee: The Dow Chemical Company
    Inventors: Oliver W. Crinkelmeyer, Earl F. Morris
  • Patent number: 4127174
    Abstract: 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: Grant
    Filed: June 17, 1977
    Date of Patent: November 28, 1978
    Assignee: The Dow Chemical Company
    Inventors: James R. Sharpe, Dustin L. Free
  • Patent number: 4125160
    Abstract: 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: Grant
    Filed: August 12, 1977
    Date of Patent: November 14, 1978
    Assignee: The Dow Chemical Company
    Inventors: Oliver W. Crinkelmeyer, Earl F. Morris
  • Patent number: 4108782
    Abstract: 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: Grant
    Filed: April 27, 1977
    Date of Patent: August 22, 1978
    Assignee: The Dow Chemical Company
    Inventor: James L. Thompson
  • Patent number: 4108930
    Abstract: 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: Grant
    Filed: July 1, 1974
    Date of Patent: August 22, 1978
    Assignee: The Dow Chemical Company
    Inventors: Oliver W. Crinkelmeyer, Earl F. Morris
  • Patent number: 4074760
    Abstract: 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: Grant
    Filed: November 1, 1976
    Date of Patent: February 21, 1978
    Assignee: The Dow Chemical Company
    Inventors: Claude T. Copeland, Vernon G. Constien
  • Patent number: 4054461
    Abstract: 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: Grant
    Filed: January 28, 1977
    Date of Patent: October 18, 1977
    Assignee: The Dow Chemical Company
    Inventor: Robert C. Martin