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| Number | Title | Issue Date |
| 8026198 | Shale hydration inhibition agent(s) and method of use A water-based drilling fluid and method of using same are presented in this disclosure, which fluid is used in drilling wells through a formation containing a shale that swells in the presence of water. The drilling fluid comprises an aqueous based continuous phase;... | 09/27/2011 |
| 7323434 | Electropositive production well treating fluid and method of preparing the same An electropositive and water-based production well treating fluid system exhibits electropositivity by using a cationic viscosifier meanwhile matched with a cationic fluid loss additive and, optionally, contains a mud-building agent, an electrical stabilizing agent,... | 01/29/2008 |
| 7247604 | Oil-based drilling fluid comprising a temperature-stable and non-polluting emulsifying system A temperature-stable, non eco-toxic oil-base well fluid that is particularly suitable for high pressure/high temperature drilling comprises an emulsification system comprising at least one superamide that may or may not be polyalkoxylated, optionally associated with... | 07/24/2007 |
| 7178610 | Subterranean treatment fluids comprising polyoxazoline compositions and methods of use in subterranean formations The present invention relates to subterranean treatment fluids. In particular, the present invention relates to subterranean treatment fluid compositions that comprise polyoxazoline compositions and methods for using such compositions in subterranean applications. I... | 02/20/2007 |
| 7081437 | Environmentally compatible hydrocarbon blend drilling fluid A method of formulating and the resulting biodegradable wellbore fluid includes a first synthetic internal olefin fraction having from 16 to 18 carbon atoms (C16-18 IO), a second synthetic internal olefin fraction having between 15 to 18 carbon atoms (C | 07/25/2006 |
| 7012043 | Drilling fluids Drilling fluid additives that act to control clay swelling in drilled formations without adversely effecting the properties of the drilling fluid. The drilling fluid additives preferably comprise a polyether amine, a polyether amine derivative, or mixtures thereof. ... | 03/14/2006 |
| 6905605 | Method for inhibiting the plugging of conduits by gas hydrates A method for inhibiting hydrate formation in a hydrocarbon flow by adding an amount of a dendrimeric compound effective to inhibit formation of hydrates at conduit temperatures and pressures, and flowing the mixture containing the dendrimeric compound and any hydrat... | 06/14/2005 |
| 6793025 | Double emulsion based drilling fluids A method of electrically logging subterranean wells using a conductive double emulsion fluid includes a miscible combination of an oleaginous fluid, an emulsifier capable of forming a microemulsion, an emulsifier capable of forming an invert emulsion, and an electro... | 09/21/2004 |
| 6770602 | Oil based well fluids with high solids content A fluid having utility in subterranean wells is formulated to include: an oleaginous fluid; and a solids tolerance agent having the formula: in which R is a C6 to C20 aliphatic group and R′ is a C... | 08/03/2004 |
| 6608005 | Wellbore fluids and their application Non-aqueous base wellbore fluids characterized by enhanced electrical conductivity due to formulation with specified ionic liquids are disclosed. Drilling, completion, and workover methods utilizing the wellbore fluids are also disclosed.... | 08/19/2003 |
| 6544932 | Additives for inhibiting gas hydrate formation An additive for inhibiting the formation of gas hydrates in connection with hydrocarbon production and transportation comprising the water-soluble polymers comprising structural elements of the formula ##STR1## wherein each R is independently H or C1... | 04/08/2003 |
| 6506710 | Viscoelastic surfactants and compositions containing same A method for controlling the rheology of aqueous systems, particularly for those intended for underground use, includes injecting an aqueous viscoelastic fluid containing a surfactant gelling agent into the system. The viscoelastic surfactant composition ... | 01/14/2003 |
| 6369004 | Additives for inhibiting gas hydrate formation An additive for inhibiting the formation of gas hydrates in connection with hydrocarbon production and transportation comprising the water-soluble polymers comprising structural elements of the formula ##STR1## wherein each R is independently H or C.sub.1... | 04/09/2002 |
| 6239183 | Method for controlling the rheology of an aqueous fluid and gelling agent therefor A method for controlling the rheology of aqueous systems, particularly for those intended for underground use, includes injecting an aqueous fluid containing a surfactant gelling agent into the system. The surfactant gelling agents are, for example, fatty... | 05/29/2001 |
| 5922653 | Compositions and processes for treating subterranean formations A composition and a process for using the composition for applications in a subterranean formation are provided. The composition comprises a clay, a polymer, and a liquid. The polymer comprises repeat units derived from a nitrogen-containing olefinic mono... | 07/13/1999 |
| 5869433 | Non-fluorescing oil-based drilling fluid The present invention relates to an oil-based drilling fluid, a continuous phase for an oil-based drilling fluid, and additives for an oil-based drilling fluid. The drilling fluid, the continuous phase of the drilling fluid, and the additives for the oil-... | 02/09/1999 |
| 5807810 | Functional fluids and liquid cleaning compositions and suspending media Aqueous structured surfactants, e.g., lamellar, or preferably spherulitic systems optionally containing suspended solids are used as functional fluids, such as drilling fluids, cutting fluids, hydraulic fluids, heat transfer fluids, construction muds and ... | 09/15/1998 |
| 5756004 | Quaternary ammonium compounds useful for inhibiting metal corrosion The present invention provides improved quaternary ammonium compounds useful as metal corrosion inhibitors in aqueous acid solutions, methods of preparing the compounds, metal corrosion inhibited aqueous acid solutions containing the compounds and methods... | 05/26/1998 |
| 5650374 | Herbicidal 1-cyclopropyl tetrazolinones Herbicidal 1-cyclopropyl tetrazolinones of the formula ##STR1## wherein X represents C1-3 alkyl, C2-4 alkenyl or halogen, n represents 0 to 5, R1 and R2 each independently represents C1-6 alkyl, C | 07/22/1997 |
| 5459125 | Corrosion inhibitor composition and method of use A composition and method for inhibiting corrosion by chlorine dioxide in oil field water flood systems are disclosed. The composition is comprised of an alcohol, an acid, a fatty imidazoline, an ethoxylated fatty diamine, and water. This composition has p... | 10/17/1995 |
| 5411670 | Method and composition for protecting metal surfaces from oxidative environments A method and coating composition for producing protective coatings on metal surfaces of tubular goods, equipment and so forth used in processes associated with oxidative environments to inhibit corrosive effects of the oxidative environments thereon. The ... | 05/02/1995 |
| 5254531 | Oleophilic basic amine compounds as an additive for invert drilling muds In a first embodiment, the invention relates to the use of basic amine compounds of pronounced oleophilic character and at most limited solubility in water, which are capable of forming salts with carboxylic acids, as an additive for w/o invert drilling m... | 10/19/1993 |
| 5189012 | Oil based synthetic hydrocarbon drilling fluid The present invention relates to an improved continuous phase for an oil based drilling fluid and specifically a synthetic hydrocarbon continuous phase which is non-polluting and minimally toxic. The invention provides excellent drilling fluid properties ... | 02/23/1993 |
| 5106516 | Monocarboxylic acid methylesters in invert drilling muds The invention relates to the use of methylesters of C6-24 monocarboxylic acids as the oil phase or as part of the oil phase of invert drilling muds which are suitable for the environment-friendly development of oil and gas sources and which, in... | 04/21/1992 |
| 5094762 | Mud drilling fluids, additives and process for making the same A drilling fluid includes water, bentonite, a weighting agent, and an additive comprising a water-soluble polycondensate containing phosphorous and nitrogen such as phosphorylated-urea-formaldehyde or phosphorylated-melamine-formaldehyde. Such additives p... | 03/10/1992 |
| 5082576 | Removal of sulfides using chlorite and an amphoteric ammonium betaine This invention relates to a composition suitable for use in process for the removal of sulfides, especially hydrogen sulfide from a feed contaminated therewith. The composition comprises an aqueous solution of a chlorite and a corrosion inhibitor which is... | 01/21/1992 |
| 4964615 | Compositions for freeing jammed drill pipes Compositions free from mineral oil and used for freeing jammed drill pipes in drilling operations, and processes for using such compositions are disclosed. The compositions comprise a mixture of: (a) one or more fatty acid alkyl esters corresponding to the fol... | 10/23/1990 |
| 4941983 | Fluid loss-reducing additives for oil-based well working fluids A fluid loss additive for oil-based well-working fluids, the fluid loss additive comprising the product of mixing in an oil or oil based liquid, (i) lignite or humic acid (ii) (a) an oil soluble or oil dispersible amine or amine salt; (b) an aliphatic amide or hydr... | 07/17/1990 |
| 4816303 | Process for inhibiting corrosion of metal and corrosion-inhibiting layer use therein Corrosion of ferrous metal and aluminum surfaces, in particular, is inhibited by a layer of an organic-metallic complex of a polyamine with a (i) metal oxide, or (ii) metallate ion, or (iii) water-soluble metallate salt, in aqueous systems having a pH gre... | 03/28/1989 |
| 4810786 | Stabilization of xanthan gum in aqueous solution A method of stabilizing an aqueous solution of xanthan gum is disclosed, comprising incorporating at least one stabilizing agent selected from thiol derivatives of heterocyclic compounds in an aqueous solution of xanthan gum.... | 03/07/1989 |
| 4762625 | Viscosifiers for brines utilizing hydrophilic polymer-mineral oil systems Alkali and alkaline earth metal and zinc halide brines may be viscosified with compositions incorporating a viscosity inducing hydrophilic polymer, mineral oil, oil soluble non-ionic surfactants, polar solvents, and diluent.... | 08/09/1988 |
| 4758357 | Dispersible hydrophilic polymer compositions for use in viscosifying heavy brines A thickening composition for use in viscosifying aqueous mediums, particularly heavy brines, comprising hydroxyethyl cellulose, 2-pyrrolidone and a mono alkyl ether of ethylene glycol which is water soluble and exerts no appreciable swelling effect on the... | 07/19/1988 |
| 4735731 | Process for reversible thickening of a liquid Industrial liquids containing viscoelastic surfactant compositions can be reversibly thickened and broken. For example, a thickened industrial liquid can exhibit good solids carrying capacity, and after the viscosity of the liquid is broken, using techniq... | 04/05/1988 |
| 4725372 | Aqueous wellbore service fluids A wellbore service fluid is provided which contains water, a water soluble electrolyte and as a thickening agent at least one of an amine, a salt of an amine, or quaternary ammonium salt which functions to increase the viscosity of the fluid in the presen... | 02/16/1988 |
| 4713183 | Oil based drilling fluid reversion On occasion, during drilling operations employing oil base drilling muds, conditions occur that cause the surface of the solid materials in the mud to be water wet, changing the rheology of the drilling mud such that it is unusable and has to be discarded... | 12/15/1987 |
| 4659676 | Fluorescent tracers for hydrophobic fluids A fluorescently labeled complex hydrophobic fluid produced by dissolving a porphyrin therein. The porphyrin must be substantially soluble in acidic aqueous solutions, substantially insoluble in neutral or alkaline aqueous solutions and fluoresce at a wave... | 04/21/1987 |
| 4658036 | Invert emulsifiers for oil-base drilling muds A process is disclosed for preparation of invert emulsifiers useful for oil-base drilling muds. The emulsifiers are prepared by reacting at least one tall oil fatty acid with acrylic acid, maleic anhydride or fumaric acid. The product of this reaction is ... | 04/14/1987 |
| 4609476 | High temperature stable aqueous brine fluids An aqueous brine fluid, particularly useful as a drilling fluid, and containing a high salt concentration, a vinyl sulfonate amide copolymer such as a water soluble copolymer of acrylamidomethylpropanesulfonic acid salts, and a thermal stability enhancing... | 09/02/1986 |
| 4607099 | Stabilization of xanthan gum in aqueous solution A method of stabilizing an aqueous solution of xanthan gum is described, comprising incorporating at least one stabilizing agent selected from the group consisting of 2-mercaptobenzimidazole and derivatives thereof in an aqueous solution of xanthan gum.... | 08/19/1986 |
| 4605505 | Drilling fluids A drilling fluid is described, consisting essentially of sodium carboxymethyl cellulose, bentonite, water, and at least one compound selected from 2-mercaptobenzimidazole compounds, 2-mercaptobenzothiazole compounds, 2-mercaptothiazoline and 2-thioimidazo... | 08/12/1986 |
