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| Number | Title | Issue Date |
| 7544785 | Process for the treatment for chitinaceous materials and for the deacetylation of chitin Disclosed is a process for the deacetylation of chitin and a process for the treatment of chitinaceous materials to obtain chitin which processes are conducted in a non-saponifiable, non-aqueous, water insoluble liquid having a flash point greater than about 100° C... | 06/09/2009 |
| 7214647 | Method of increasing the low shear rate viscosity of well drilling and servicing fluids containing calcined magnesia bridging solids, the fluids and methods of use The invention provides well drilling and servicing fluids, and methods of drilling, completing, or working over a well therewith, preferred fluids comprise an aqueous liquid, a water soluble polymer viscosifier (preferably xanthan gum), a polymeric fluid loss contro... | 05/08/2007 |
| 7211546 | Method of increasing the low shear rate viscosity of well drilling and servicing fluids containing calcined magnesia bridging solids, the fluids and methods of use The invention provides well drilling and servicing fluids, and methods of drilling, completing, or working over a well therewith, preferred fluids comprise an aqueous liquid, a water soluble polymer viscosifier (preferably xanthan gum), a polymeric fluid loss contro... | 05/01/2007 |
| 7137459 | Silicate drilling fluid and method of drilling a well therewith The invention discloses methods of formulating an alkali metal silicate-containing drilling fluid and drilling a well therewith. Thus an alkali metal silicate is added to an aqueous base drilling fluid, when the drilling fluid is being circulated while drilling, at ... | 11/21/2006 |
| 7018956 | Crosslinked polymer fluids and crosslinking concentrates therefor Disclosed is a concentrate composition for crosslinking polysaccharide polymers hydrated in an aqueous liquid, and well servicing fluids, preferably fracturing fluids, prepared therewith. Preferred polysaccharide polymers are galactomannan gums or derivatives thereo... | 03/28/2006 |
| 6936575 | Borate crosslinker suspensions with more consistent crosslink times The invention provides an aqueous suspension/concentrate of a sparingly soluble borate, preferably as disclosed in Mondshine U.S. Pat. No. 4,619,776, which is effective in crosslinking aqueous solutions of a water soluble, borate-crosslinkable polymer, preferably gu... | 08/30/2005 |
| 6884762 | Ester-containing downhole drilling lubricating composition and processes therefor and therewith A lubricating composition containing one or more esters obtained as a reaction product from a reaction mixture of a glycerol component, a fatty acid component, and a carboxylic acid component wherein said glycerol component comprises glycerol, glycerol oligomers, or... | 04/26/2005 |
| 6800593 | Hydrophilic polymer concentrates Disclosed is a hydrophilic, water soluble polymer concentrate for addition to aqueous liquids to enhance the properties thereof, particularly to increase the viscosity or decrease the fluid loss of well drilling and servicing fluids, the concentrate comprising a hyd... | 10/05/2004 |
| 6780822 | Anhydride-modified chitosan, method of preparation thereof, and fluids containing same 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 chi... | 08/24/2004 |
| 6656885 | Anhydride-modified chitosan, method of preparation thereof, and fluids containing same 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 ... | 12/02/2003 |
| 6576597 | Method of increasing the low shear rate viscosity and shear thinning index of divalent cation-containing fluids and the fluids obtained thereby Disclosed is a method of increasing the low shear rate viscosity and the shear thinning index of aqueous fluids containing a divalent cation salt, a crosslinked amylopectin starch which functions as both a viscosifier/suspending agent and as a fluid loss ... | 06/10/2003 |
| 6562762 | Method of and composition for reducing the loss of fluid during well drilling, completion or workover operations Disclosed is a composition for and method of reducing the loss of fluid from well drilling, completion, or workover fluids during well drilling, completion, or workover operations, particularly for reducing or overcoming the lost circulation of drilling f... | 05/13/2003 |
| 6391830 | Divalent cation-containing well drilling and servicing fluids The invention provides clay-free, preferably biopolymer free, well drilling and servicing fluids comprising an aqueous divalent cation-containig water soluble salt, a bridging agent, and a pre-gelatinized crosslinked amylopectin starch suspending agent an... | 05/21/2002 |
| 6358889 | Viscosified aqueous chitosan-containing well drilling and servicing fluids 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 wellb... | 03/19/2002 |
| 6325149 | Method of decreasing the loss of fluid during workover and completion operations The invention provides solids-free, viscous fluids (pills) for use in various well workover and completion operations including as displacement spacer pills, standard fluid loss control pills, post gravel pack in-screen pills, perforation sealing, and the... | 12/04/2001 |
| 6300286 | Divalent cation-containing well drilling and service fluid The invention provides clay-free, preferably biopolymer free, well drilling and servicing fluids comprising an aqueous divalent cation-containing water soluble salt, a bridging agent, and a pre-gelatinized crosslinked amylopectin starch suspending agent a... | 10/09/2001 |
| 6291404 | Viscosified aqueous chitosan-containing well drilling and servicing fluids 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... | 09/18/2001 |
| 6277792 | Viscosified aqueous fluids and viscosifier therefor 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 ald... | 08/21/2001 |
| 6258755 | Chitosan-containing well drilling and servicing fluids 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-... | 07/10/2001 |
| 6156708 | Aphron-containing oil base fluids and method of drilling a well therewith Aphron-containing oil based well drilling and servicing fluids are disclosed which seal microfractures and the like during drilling and well servicing operations, thus decreasing the volume of fluid lost to the formations contacted by the fluids.. The flu... | 12/05/2000 |
| 6148917 | Method of releasing stuck pipe or tools and spotting fluids therefor Aphron-containing spotting fluids and their use in releasing pipe or tools stuck in the filter cake on the sides of a borehole are disclosed. The spotting fluids comprise a liquid, either aqueous, oleaginous, or mixtures thereof, a viscosifier which impar... | 11/21/2000 |
| 6127319 | Oil-in-water emulsion 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 ... | 10/03/2000 |
| 6123159 | Aphron-containing well drilling and servicing fluids of enhanced stability 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 bo... | 09/26/2000 |
| 6103671 | Glycol solution drilling system The invention provides water base well drilling and servicing fluids containing a biopolymer viscosifier and a water soluble polyalkylene glycol shale stabilizing additive therein having enhanced thermal stability, as indicated by the low shear rate visco... | 08/15/2000 |
| 5977030 | Method of increasing the LSRV of aqueous fluids and oil-in-water emulsions prepared thereby 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, galact... | 11/02/1999 |
| 5942468 | Invert emulsion well drilling and servicing fluids Disclosed are invert oil emulsion drilling fluids in which the internal aqueous phase contains one or more water soluble polyethylene glycols dissolved therein. The fluids are characterized by an elevated low shear rate viscosity, hence excellent suspensi... | 08/24/1999 |
| 5916849 | Polysaccharide-containing well drilling and servicing fluids 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,... | 06/29/1999 |
| 5881826 | Aphron-containing well drilling and servicing fluids The invention provides a method and fluid for drilling or servicing a well in a subterranean formation containing lost circulation zones or depleted, low pressure reservoirs. A method of decreasing the density of the fluid circulated in a borehole, decrea... | 03/16/1999 |
| 5804535 | Well drilling and servicing fluids and methods of increasing the low shear rate viscosity thereof A well drilling and servicing fluid comprising a brine having dissolved therein a formate salt selected from the group consisting of potassium formate, cesium formate, and mixtures thereof, a biopolymer viscosifier, and a pre-gelatinized amylopectin deriv... | 09/08/1998 |
| 5783527 | Well drilling and servicing fluids which deposit an easily removable filter cake The invention provides alkaline water base well drilling and servicing fluids which deposit an easily degradable and removable filter cake on the sides of a borehole during well drilling and servicing operations. The fluids contain one or more polysacchar... | 07/21/1998 |
| 5783526 | Process to enhance removal of adhering solids from the surface of wellbores and sand control devices therein The invention provides: (1) a process to enhance the removal of solids such as clays, clay-like solids, and shale solids-drill solids-from the surface of a borehole, the solids being deposited from well drilling, completion, or workover fluids during well... | 07/21/1998 |
| 5728654 | Stabilized fluids containing soluble zinc Disclosed are low solids, high density fluids useful as drilling, workover, and completion fluids and the like in oil and gas well operations. The fluids comprise a brine having dissolved therein a zinc salt such as zinc bromide, and optionally one or mor... | 03/17/1998 |
| 5728652 | Brine fluids having improved rheological charactersitics The invention provides brine based well drilling and servicing fluids which exhibit relatively thermally stable rheological and filtration characteristics. The fluids comprise a brine, an amorphous silica viscosifier, a biopolymer viscosifier, a fluid los... | 03/17/1998 |
| 5710107 | Environmentally safe drilling fluid The invention provides for either (a) increasing the yield point or gel strength of an aqueous based drilling fluid; (b) decreasing the fluid loss of an aqueous based drilling fluid; (c) decreasing the coefficient of friction of an aqueous based drilling ... | 01/20/1998 |
| 5641728 | Control of the fluid loss of well drilling and servicing fluids The invention provides brine based well drilling and servicing fluids containing a fluid loss control additive selected from the group consisting of (1) a crosslinked ether derivative of a partially depolymerized starch, (2) a partially depolymerized cros... | 06/24/1997 |
| 5629271 | Methods of reducing fluid loss and polymer concentration of well drilling and servicing fluids The invention provides methods for (1) reducing the fluid loss of and (2) reducing the concentration of polymer required to provide a desired degree of fluid loss control to, a well drilling and servicing fluid which contains at least one polymeric viscos... | 05/13/1997 |
| 5616541 | Low solids, high density fluids for well drilling Disclosed are low solids, high density fluids useful as drilling, workover, and completion fluids and the like in oil and gas well operations. The fluids comprise one or more brines having a density greater than about 1500 kg/m3, a viscosifier ... | 04/01/1997 |
| 5607905 | Well drilling and servicing fluids which deposit an easily removable filter cake The invention provides alkaline water base well drilling and servicing fluids which deposit an easily degradable and removable filter cake on the sides of a borehole during well drilling and servicing operations. The fluids contain one or more polysacchar... | 03/04/1997 |
| 5514644 | Polysaccharide containing fluids having enhanced thermal stability The invention provides (1) a method of increasing the thermal stability of an aqueous polysaccharide-containing fluid by adding thereto magnesia and a thiosulfate salt; (2) a drilling, completion, or workover fluid comprising an aqueous liquid, a water so... | 05/07/1996 |
| 5403820 | Environmentally safe water base drilling fluid The invention provides a water base drilling fluid having decreased swelling effect on hydratable shales contacted by the drilling fluid wherein the aqueous phase contains an alkyl glucoside solubilized therein. Another embodiment of the invention provide... | 04/04/1995 |
