| Patent Number |
Title Of Patent |
Date Issued |
| 6780822 |
Anhydride-modified chitosan, method of preparation thereof, and fluids containing same |
August 24, 2004 |
| The invention provides an organic diacid anhydride-modified chitosan and a method of preparing the same under high shear conditions which eliminates the use of solvents and excessive amounts of aqueous liquids. Also provided are organic diacid anhydride-modified chitosans containing an |
| 6656885 |
Anhydride-modified chitosan, method of preparation thereof, and fluids containing same |
December 2, 2003 |
| The invention provides an organic diacid anhydride-modified chitosan containing a polar additive comprising water soluble compounds containing one or more hydroxyl groups or one or more amino groups, including compounds containing both hydroxyl and amine groups, having a molecular we |
| 6422326 |
Aphron-containing well drilling and servicing fluids of enhanced stability |
July 23, 2002 |
| The invention provides a method and fluid for drilling or servicing a well in a subterranean formation, particularly containing lost circulation zones or depleted, low pressure reservoirs. A method of decreasing the density of the fluid circulated in a borehole, decreasing the invasion o |
| 6358889 |
Viscosified aqueous chitosan-containing well drilling and servicing fluids |
March 19, 2002 |
| The invention provides well drilling and servicing fluids comprising an alkaline aqueous liquid containing chitosan, an anhydride, and an aldehyde therein. The invention further provides a method of drilling a well wherein there is circulated in the wellbore during drilling a drilling |
| 6291404 |
Viscosified aqueous chitosan-containing well drilling and servicing fluids |
September 18, 2001 |
| The invention provides aqueous viscous or gelled alkaline fluids particularly useful in oil and gas well operations, and a method of drilling a well therewith. The fluids contain chitosan, an amine reactive acid, and an aldehyde therein, whereby the amine reactive acid and the aldehy |
| 6277792 |
Viscosified aqueous fluids and viscosifier therefor |
August 21, 2001 |
| The present invention discloses a method of producing modified, derivatized chitosans which produce viscous aqueous liquids when dispersed (solublized) in compatible aqueous liquids. The method comprises reacting chitosan in an acidic solution with an aldehyde-group containing chemical |
| 6258755 |
Chitosan-containing well drilling and servicing fluids |
July 10, 2001 |
| Disclosed are a process for the preparation of pseudoplastic, shear thinning chitosan-containing fluids, and a method of enhancing the thermal stability of such fluids. Pseudoplastic fluids useful oil and/or gas wells, particularly drilling fluids, drill-in fluids, workover fluids, c |
| 6127319 |
Oil-in-water emulsion |
October 3, 2000 |
| Disclosed are oil-in-water emulsions containing an aqueous continuous phase, an emulsified oleaginous liquid, and an oligosaccharide mixture composed of sugar units selected from the group consisting of arabinose, mannose, galactose, glucose, xylose, and mixtures thereof, and which c |
| 6123159 |
Aphron-containing well drilling and servicing fluids of enhanced stability |
September 26, 2000 |
| The invention provides a method and fluid for drilling or servicing a well in a subterranean formation, particularly containing lost circulation zones or depleted, low pressure reservoirs. A method of decreasing the density of the fluid circulated in a borehole, decreasing the invasion o |
| 6014947 |
Ground grain animal litter |
January 18, 2000 |
| The present invention provides an improved method for sorbing aqueous fluids through the use of a biodegradable, clumping, low odor, low attrition, low swelling ground grain litter. The ground grain litter is composed of a ground grain selected such that when the ground grain is wett |
| 5977030 |
Method of increasing the LSRV of aqueous fluids and oil-in-water emulsions prepared thereby |
November 2, 1999 |
| Disclosed are oil-in-water emulsions containing an aqueous polysaccharide-containing continuous phase, an emulsified oleaginous liquid, and an oligosaccharide mixture composed of sugar units selected from the group consisting of arabinose, mannose, galactose, glucose, xylose, and mix |
| 5916849 |
Polysaccharide-containing well drilling and servicing fluids |
June 29, 1999 |
| Disclosed is a method of increasing the thermal stability or decreasing the fluid loss of aqueous polysaccharide-containing fluids which comprises incorporating into the fluids an oligosaccharide mixture composed of arabinose, mannose, galactose, glucose, and xylose sugar units, the |
| 5230305 |
Scoopable cat litter and method |
July 27, 1993 |
| An improvement in the use of clumping, scoopable litter to sorb and remove the urine deposited in litter receptacles by utilizing as the litter a natural product which has been modified to render it cohesive when wetted with urine. The modified natural product has excellent cohesion, is |
| 5207830 |
Lightweight particulate cementitious materials and process for producing same |
May 4, 1993 |
| Disclosed is a process of manufacturing a lightweight particulate cementitious composition particularly adapted to the sorption of liquids comprising adding to a foamed cement slurry a particle forming agent, and aging the treated foamed slurry for a period of time sufficient for the |
| 5188064 |
Clumping cat litter |
February 23, 1993 |
| The invention provides a method of increasing the sorption capacity of smectite clays which exhibit osmotic swelling such as montmorillonite clays having predominately sodium as the exchangeable cation. The invention further provides a clumping cat litter having excellent cohesivenes |
| 5147852 |
Reduction of seepage losses in well working compositions |
September 15, 1992 |
| The invention provides well working compositions containing a particulate additive to decrease the seepage loss of the fluid to fluid permeable formations contacted by the compositions. The additive comprises: (1) a cellulosic material selected from the group consisting of oat hulls, |
| 5076944 |
Seepage loss reducing additive for well working compositions and uses thereof |
December 31, 1991 |
| 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 cott |
| 5071575 |
Well working compositions, method of decreasing the seepage loss from such compositions, and add |
December 10, 1991 |
| 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 hul |
| 5045593 |
Organophilic modified polymers |
September 3, 1991 |
| Organophilic polymer adducts which are effective fluid loss control additives for oil base well-working fluids are prepared from an anionic or cationic water soluble polymer and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most |
| 5009798 |
Low fluid loss heavy brines containing hydroxyethyl cellulose |
April 23, 1991 |
| Disclosed are heavy brine compositions containing zinc bromide and one or more soluble salts selected from the group consisting of calcium chloride and calcium bromide, preferably having a density in the range from about 14.2 to about 16.0 pounds per gallon, which have a low API fluid lo |
| 5004553 |
Well working compositions, method of decreasing the seepage loss from such compositions, and add |
April 2, 1991 |
| 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 hul |
| 4960740 |
Organophilic clay compositions |
October 2, 1990 |
| Organophilic clays which are effective fluid loss control additives for oil base well-working fluids are prepared from a swelling smectite clay and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most preferably commercial lecithin suc |
| 4956104 |
Organophilic polymers |
September 11, 1990 |
| Organophilic polymer adducts which are effective fluid loss control additives for oil base well-working fluids are prepared from an anionic or cationic water soluble polymer and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most |
| 4925616 |
Method of protecting a cased pipeline from corrosion |
May 15, 1990 |
| Tall oil pitch is used as casing fillers in the interstitial spaced between a pipeline and a surrounding casing pipe. The tall oil pitch can be used per se or can be modified by: increasing its specific gravity above 1.0; increasing its pour point or dropping point; increasing its viscos |
| 4863980 |
Organophilic modified polymers |
September 5, 1989 |
| Organophilic polymer adducts which are effective fluid loss control additives for oil base well-working fluids are prepared from an anionic or cationic water soluble polymer and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most |
| 4853465 |
Organophilic polyphenolic acid adducts |
August 1, 1989 |
| Organophilic polyphenolic materials which are effective fluid loss control additives for oil base well-working fluids are prepared from a polyphenolic material and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most preferably com |
| 4843048 |
Organophilic clay compositions |
June 27, 1989 |
| Organophilic clays which are effective fluid loss control additives for oil base well-working fluids are prepared from a swelling smectite clay and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most preferably commercial lecithin suc |
| 4737295 |
Organophilic polyphenolic acid adducts |
April 12, 1988 |
| Organophilic polyphenolic materials which are effective fluid loss control additives for oil base well-working fluids are prepared from a polyphenolic material and one or more phosphatides. Preferred phosphatides are phosphoglycerides obtained from vegetable oils, most preferably com |
| 4686051 |
Method of increasing the rate of hydration of activated hydroxyethyl cellulose compositions |
August 11, 1987 |
| A method of producing a well servicing fluid containing zinc bromide in which an activated hydroxyethyl cellulose is either admixed with a zinc bromide solution containing above about 30% by weight zinc bromide, or, in the alternative, is admixed with a non-zinc bromide containing soluti |
| 4597878 |
Polyphenolic acid adducts |
July 1, 1986 |
| The invention provides novel humic acid derivatives obtained by reacting humic acid-containing materials with a noval amide mixture comprising a polyamide and an amido-amine containing one free amino group per molecule. The novel amide mixture is obtained by reacting under amidation cond |
| 4582614 |
Compositions and method for thickening aqueous brines |
April 15, 1986 |
| A polymeric composition useful in the thickening of aqueous brines comprising hydroxyethyl cellulose, a water miscible organic liquid and an aqueous liquid. |
| 4566976 |
Viscous heavy brines |
January 28, 1986 |
| Hydroxyethyl cellulose and a sequestrant are added to a heavy brine containing one or more salts selected from calcium chloride, calcium bromide, and zinc bromide to increase the viscosity of the brine. Preferably the brine contains zinc bromide, has a density in the range from about |
| 4528104 |
Oil based packer fluids |
July 9, 1985 |
| An oil base packer fluid for use in completing oil and gas wells comprising:(a) a liquid oleaginous medium;(b) an organophilic clay comprising the reaction product of an organic onium compound and a smectite clay;(c) a polar dispersant for said clay; and(d) a polyfunctional amino silane repr |
| 4496468 |
Hydrated hydroxyethyl cellulose compositions |
January 29, 1985 |
| A method of activating hydroxyethyl cellulose (HEC) such that the HEC will hydrate in heavy brines having a density greater than about 13.5 pounds per gallon at ambient temperature, the activated HEC compositions so produced, and viscous well servicing compositions wherein an oleaginous |
| 4476032 |
Method of increasing the rate of hydration of activated hydroethyl cellulose compositions |
October 9, 1984 |
| A method of producing a well servicing fluid containing zinc bromide in which an activated hydroxyethyl cellulose is either admixed with a zinc bromide solution containing above about 30% by weight zinc bromide, or, in the alternative, is admixed with a non-zinc bromide containing soluti |
| 4464274 |
Organophilic clay suspending agents |
August 7, 1984 |
| The invention provides methods of preparing organophilic clay suspending agents having enhanced dispersibility in oleaginous liquids, the organophilic clay containing suspending agents, and methods of increasing the viscosity of oleaginous liquids utilizing these suspending agents. The |
| 4459214 |
Viscous heavy brines |
July 10, 1984 |
| Hydroxyethyl cellulose and a sequestrant are added to a heavy brine containing one or more salts selected from calcium chloride, calcium bromide, and zinc bromide to increase the viscosity of the brine. Preferably the brine contains zinc bromide, has a density in the range from about |
| 4439333 |
Heavy brine viscosifiers |
March 27, 1984 |
| Polymeric compositions for, and methods of, increasing the viscosity of aqueous brine well servicing fluids comprising adding to the brine a composition containing hydroxyethyl cellulose, a solid organic activating agent for the hydroxyethyl cellulose, and a solvent for the activating |
| 4435564 |
Compositions and processes for using hydroxyethyl cellulose in heavy brines |
March 6, 1984 |
| Processes are disclosed for activating hydroxyethyl cellulose (HEC) such that the HEC will disperse and hydrate in compatible heavy brines having a density greater than about 13.5 pounds per gallon containing one or more salts selected from the group consisting of calcium chloride, calci |
| 4435309 |
Method of liquifying waxy materials |
March 6, 1984 |
| The invention discloses a method of liquifying materials which are either waxy solids at ambient temperatures or solid or semi-solid mixtures of such waxy materials and a solvent therefor. Specifically, the invention discloses a method of preparing a liquid suspension of a waxy material |
| 4435217 |
Concentrated hydrophilic polymer suspensions |
March 6, 1984 |
| The thermal aging stability of liquid suspensions of hydrophilic, water-soluble polymers in an organic liquid is improved by adding to the suspension a liquid fatty acid. Superior liquid polymer compositions having improved resistance to settling (syneresis), thermal aging characteri |
| 4427556 |
Dispersible hydrophilic polymer compositions |
January 24, 1984 |
| A polymer composition for use in aqueous mediums comprising a hydrophilic polymer, a water miscible polar organic liquid which acts as a solvating agent for the hydrophilic polymer, the solvating agent being of a type which forms a semi-solid to viscous mixture with the hydrophilic polym |
| 4425244 |
Organophilic clay gellants |
January 10, 1984 |
| The invention provides methods of preparing organophilic clays having enhanced dispersibility in organic liquids, the organophilic clay containing gellants, and methods of increasing the viscosity of organic liquids utilizing these gellants. |
| 4420406 |
Thickened heavy brines |
December 13, 1983 |
| A thickened brine solution useful as a well servicing fluid is prepared, said solution consisting essentially of water, at least 20% by weight zinc bromide, calcium bromide, and a viscosifying amount of hydroxyethyl cellulose. |
| 4392964 |
Compositions and method for thickening aqueous brines |
July 12, 1983 |
| A polymeric composition useful in the thickening of aqueous brines comprising hydroxyethyl cellulose, a water miscible organic liquid and an aqueous liquid. |
| 4382868 |
Organophilic clay gellants |
May 10, 1983 |
| The invention provides methods of preparing organophilic clays having enhanced dispersibility in organic liquids, the organophilic clay containing gellants, and methods of increasing the viscosity of organic liquids utilizing these gellants. |
| 4269279 |
Spheroidal plastic coated magnetizable particles and their use in drilling fluids |
May 26, 1981 |
| Plastic coated magnetic particles in bead form are used in drilling fluids to increase the lubricity thereof as indicated by a decrease in the drilling torque or the power required to rotate the drill string. Also provided is a method of recovering the beads from the drilling fluid for |
