Patents Examined by Chhaya Sayala
  • Method and composition for selectively reducing permeability to water in hydrocarbon reservoirs which are hot and saline
    Patent number: 5082577
    Abstract: For selectively reducing permeability to water in an underground formation producing oil and/or gas, injecting into the formation a composition comprising water, at least one water soluble aldehyde compound at a concentration (by weight) of 180 to 20,000 ppm and at least one non-ionic polysaccharide at a concentration (by weight) of 200 to 5000 ppm, the concentration of aldehyde compound being higher than that of polysaccharide. The composition may be used in the water injection well or the hydrocarbon producing well and may assist in the recovery of hydrocarbons.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: January 21, 1992
    Assignee: Institut Francais du Petrole
    Inventors: Norbert Kohler, Alain Zaitoun
  • High melting aromatic nitrate esters
    Patent number: 5081255
    Abstract: A nitrate ester which is 2,4,6-trinitro-1-(2-hydroxyethylamino)-3- (2-hydyethylnitramino)benzenedinitrate; 2,4,6-trinitro-1,3,5-tris(2-hydroxyethylamino)benzenetrinitrate; 2,2',4,4',6,6'-hexanitro-3-(2-hydroxyethylnitramino)stilbenitrate; 2,5-bis[3-(hydroxyethylaminonitrate)-2,4,6-trinitrophenyl]1,3,4-oxadiazole ; or 2,5-bis[3-(hydroxyethylaminonitrate)-5- (hydroxyethylnitraminonitrate)-2,4,6-trinitrophenyl]-1,3,4-oxiazole and a process for preparing these compounds.
    Type: Grant
    Filed: May 17, 1991
    Date of Patent: January 14, 1992
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Michael E. Sitzmann
  • Seepage loss reducing additive for well working compositions and uses thereof
    Patent number: 5076944
    Abstract: The invention provides well working fluid compositions containing cotton burrs ground to certain particle size ranges to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. Also provided is a seepage loss additive comprising the ground cotton burrs in combination with one or more of ground oat hulls, ground corn cobs, hydrophobic organophilic water wettable cotton, ground citrus pulp, ground peanut shells, ground rice hulls, and ground nut shells.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: December 31, 1991
    Assignee: Venture Innovations, Inc.
    Inventors: Jack C. Cowan, Roy F. House, Andree' H. Harrington
  • Process and compositions for reducing the corrosiveness of oxygenated saline solutions by stripping with acidic gases
    Patent number: 5071574
    Abstract: A process for reducing the corrosiveness of aerated aqueous solutions, which comprises stripping the oxygen with gas containing hydrogen sulfide after addition of a composition which is both catalytic of the reduction of oxygen by hydrogen sulfide gas and inhibiting of hydrogen sulfide corrosion, such composition comprising certain metallic salts and a water-soluble oxyethylenated amine.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: December 10, 1991
    Assignee: CECA, S.A.
    Inventor: Tang E. Pou
  • Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor
    Patent number: 5071575
    Abstract: The invention provides well working fluid compositions containing oat hulls ground to certain particle size ranges to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. Also provided is a seepage loss additive comprising the ground oat hulls in combination with one or more of ground corn cobs, hydrophobic organophilic water wettable cotton, ground citrus pulp, and ground cotton burrs.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: December 10, 1991
    Assignee: Venture Innovations, Inc.
    Inventors: Roy F. House, Andree H. Harrington, Jack C. Cowan
  • 1,3-di-arylmethoxy-4,6-dinitro-benzenes, process for their preparation and process for the preparation of 4,6-diaminoresorcinol
    Patent number: 5072053
    Abstract: The new 1,3-di-arylmethoxy-4,6-dinitrobenzenes of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another denote hydrogen or C.sub.1 -C.sub.4 -alkyl andAr represents C.sub.6 -C.sub.12 -aryl,can be prepared by reaction of 1,3-dihalogeno-4,6-dinitro-benzenes of the formula ##STR2## in which Hal represents chlorine or bromine, with an arylmethanol of the formulaAr--C(R.sup.1, R.sup.2)OH (IV),in which R.sup.1, R.sup.2 and Ar have the said meaning, and a strong base in the temperature range from 0.degree. to 100.degree. C.These di-arylmethoxy-dinitro-benzenes can be converted into 4,6-diaminoresorcinol by catalytic reduction with hydrogen.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: December 10, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz U. Blank, Uwe Heinz
  • 1,14-bis(4-nitrophenyl)-1,3,5,7,9,11,13-tetradecaheptaene and preparation method thereof
    Patent number: 5072061
    Abstract: 1,14-bis(4-nitrophenyl)-1,3,5,7,9,11,13-tetradecaheptaene having the following formula (I): ##STR1## and a method of preparing the above-mentioned 1,14-bis(4-nitrophenyl)-1,3,5,7,9,11,13-tetradecaheptaene having formula (I) by allowing a phosphonium salt having formula (II) to react with 5-(4-nitrophenyl)-2,4-pentadiene-1-al having formula (III) in the presence of a basic catalyst:R.sub.3 P.sup..sym. H.sub.2 C--CH.dbd.CH--CH.sub.2 P.sup..sym. R.sub.3.2X.sup..crclbar.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: December 10, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaomi Sasaki, Tomoyuki Shimada, Mitsuru Hashimoto
  • Dissolution of sulfate scales
    Patent number: 5068042
    Abstract: The invention provides for the use of compositions to dissolve sulfate scales from surfaces containing these scales, comprising an aqueous solution of an aminopolycarboxylic acid (APCA) containing 1 to 4 amino groups, e.g., diethylenetriaminepentaacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA), or a salt thereof, and a second component which is diethylenetriaminepenta (methylenephosphonic acid) (DTPMP) or a salt thereof, or aminotri(methylenephosphonic acid) (ATMP), or a salt thereof. More particularly, the invention encompasses a method of removing sulfate scales from surfaces on which they have formed utilizing the foregoing solutions, particularly the removal of scales from equipment and wellbore surfaces associated with the operation of crude oil and gas wells.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: November 26, 1991
    Assignee: Mobil Oil Corporation
    Inventor: John Hen
  • Preformed surfactant-optimized aqueous alkaline flood
    Patent number: 5068043
    Abstract: An aqueous alkaline flood for recovering oil from a reservoir containing acidic oil is improved by adding to the injected aqueous alkaline solution both a stoichiometric excess of the alkaline material and a kind and amount of preformed cosurfactant material that increases the salinity of that solution so that, in contact with the oil in the reservoir, it will form a surfactant system having a salinity requirement which minimizes the interfacial tension between it and the oil.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: November 26, 1991
    Assignee: Shell Oil Company
    Inventors: David R. Thigpen, Jimmie B. Lawson, Richard C. Nelson
  • Surfactant composition
    Patent number: 5062970
    Abstract: A surfactant composition, suitable for enhanced oil recovery comprising in a 60:40 to 10/90 weight ratio a) (o,m)- and/or (o,p)-dialkylbenzene alkali sulfonate and b) polyalkoxyphenyl ether alkali sulfonate.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: November 5, 1991
    Assignee: Shell Oil Company
    Inventors: Herman M. Muijs, Nicolaas C. M. Beers, Sebastianus P. F. M. Roefs
  • Aqueous gel system of partially methylated melamine-formaldehyde resin and polyvinyl alcohol
    Patent number: 5061387
    Abstract: A stable aqueous gel is formed from a polyvinyl alcohol or vinyl alcohol copolymer and a partially methylated melamine-formaldehyde resin in the presence of a pH regulating agent which provides an initial acid pH during the formulation of the gel.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: October 29, 1991
    Assignee: Conoco Inc.
    Inventor: Claus Victorius
  • Surfactant composition
    Patent number: 5061386
    Abstract: Surfactant composition comprising an alkyl amine ethoxylate and a gel breaker, wherein the gel breaker is a random copolymer of ethylene oxide with propylene oxide/or butylene oxide.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: October 29, 1991
    Assignee: Shell Oil Company
    Inventors: Herman M. Muijs, Jan V. Schaik
  • Dissolution of sulfate scales
    Patent number: 5059333
    Abstract: The invention provides for the use of compositions to dissolve sulfate scales from surfaces containing these scales, comprising an aqueous solution of an aminopolycarboxylic acid (APCA) containing 1 to 4 amino groups, e.g., diethylenetriaminepentaacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA), or a salt thereof, and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) or a salt thereof. More particularly, the invention encompasses a method of removing sulfate scales from surfaces on which they have formed utilizing the foregoing solutions, particularly the removal of scales from equipment and wellbore surfaces associated with the operation of crude oil and gas wells.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: October 22, 1991
    Assignee: Mobil Oil Corporation
    Inventor: John L. Hen
  • Process for preparation of crystalline oxytitanium phthalocyanine
    Patent number: 5059355
    Abstract: A process for the preparation of crystalline oxytitanium phthalocyanine showing a distinct diffraction in peak at a Bragg angle (2.theta..+-.0.2.degree.) of 27.3.degree. in the X-ray diffraction spectrum, which comprises mechanically pulverizing oxytitanium phthalocyanine, dispersing it in water to form a suspension, adding an organic solvent into the suspension and heating the suspension.
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: October 22, 1991
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Hitoshi Ono, Yoshiaki Kato, Sumiko Watabe
  • Process for preparing dinitrotoluene
    Patent number: 5057632
    Abstract: Described herein is a continuous process for preparing dinitrotoluene by reacting toluene with dilute nitric acid to produce mononitrotoluene, then reacting the mononitrotoluene with concentrated nitric acid to produce dinitrotoluene.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: October 15, 1991
    Assignee: Olin Corporation
    Inventors: Peter C. Imm, Allan B. Quakenbush
  • Non-hydrocarbon invert emulsions for use in well drilling operations
    Patent number: 5057234
    Abstract: Brine-in-glycol emulsions are shown for use as well working fluids. The fluids have a glycol external phase and a brine internal phase. The separate phases are emulsified to create an emulsion and weighted with traditional weighting agents. The external phase is soluble or dispersible in sea water when diluted upon discharge.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: October 15, 1991
    Assignee: Baker Hughes Incorporated
    Inventors: Ronald G. Bland, Dennis K. Clapper
  • Reduction of the viscosity of solutions viscosified with Xanthan gum polymers
    Patent number: 5055209
    Abstract: The viscosity of Xanthan gum polymer solutions is reduced by the addition of hydrogen peroxide and adjustment of the pH of the solution to at least 8.0.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: October 8, 1991
    Assignee: Osca, Inc.
    Inventors: Kenneth L. Bridges, Kerry L. Kalinski
  • Method for dewaxing oil and gas pipelines or wells
    Patent number: 5053149
    Abstract: A process for dissolving wax, paraffin and/or sulfur deposits in an oil or gas pipeline or well comprises providing at the site of the deposit an acid and a compound which liberates carbon disulfide upon contact with the acid, whereby the deposit is dissolved by the liberated carbon disulfide.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: October 1, 1991
    Assignee: Atochem North America, Inc.
    Inventors: Paul J. McElligott, Jr., Stanley R. Sandler, John F. Kennoy, William J. Tuszynski
  • Scale removal treatment
    Patent number: 5051197
    Abstract: An aqueous composition comprises an aminopolycarboxylic acid and a water-soluble organosilicon compound. The composition is useful for removing scale from well equipment and/or openings in a subterreanean formation, and for stabilizing fine particles within the formation to prevent their subsequent movement. Fluid flow through formations and wells treated with the composition tends to be increased and more stable.
    Type: Grant
    Filed: October 10, 1990
    Date of Patent: September 24, 1991
    Assignee: Union Oil Company of California
    Inventors: Leonard J. Kalfayan, David R. Watkins, Gregory S. Hewgill
  • Water based synthetic hydrocarbon drilling fluid and spotting fluid
    Patent number: H1000
    Abstract: The present invention relates to an improved water based drilling fluid and an improved spotting fluid utilizing unhydrogenated synthetic hydrocarbon compositions which are non-polluting and minimally toxic. The invention provides excellent drilling fluid properties under a wide variety of drilling conditions. The synthetic hydrocabons are selected from the group consisting of branched chain oligomers synthesized from one or more olefins containing a C.sub.2 to C.sub.14 chain length and wherein the oligomers have an average molecular weight of from 120 to 1000. The compositions of these hydrocarbons are free of aromatics and petroleum based toxic impurities. The synthetic hydrocarbons are unhydrogenated.
    Type: Grant
    Filed: August 16, 1990
    Date of Patent: December 3, 1991
    Assignee: M-I Drilling Fluids Company
    Inventors: Arvind D. Patel, Raymond E. McGlothlin