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| Number | Title | Issue Date |
| 8062997 | Method for enhancing stability of oil based drilling fluids at high temperatures Methods for enhancing the stability of ester based drilling fluids for drilling, running casing in, and/or cementing a borehole in a subterranean formation are disclosed, as well as improved ester based drilling fluids for use at high temperatures. The advantages of... | 11/22/2011 |
| 7939470 | Invert emulsion drilling fluids comprising quaternary ammonium emulsifiers and argillaceous solids and methods of drilling boreholes An invert emulsion drilling fluid, and a method for the use thereof in drilling wellbores, with good rheological properties at high temperatures and pressures. One embodiment of the drilling fluids are free of organophilic clays and lignites, free of calcium chlorid... | 05/10/2011 |
| 7915202 | Clay control additive for wellbore fluids A clay stabilizer which is capable of inhibiting swelling in a wide variety of clay types and is also capable of restoring permeability in formations which have previously been damaged by clay swelling. Amine salts of differing molecular weights configurations and i... | 03/29/2011 |
| 7846876 | Surfactant composition The present invention relates to a surfactant composition containing a cationic surfactant (hereinafter referred to as a compound (A)), one or more compounds (hereinafter referred to as a compound (B)) selected from anionic aromatic compounds and bromide compounds a... | 12/07/2010 |
| 7799741 | Drilling mud containing hydrophobin The present invention relates to the use of at least one hydrophobin or at least one hydrophobin derivative in a drilling mud. ... | 09/21/2010 |
| 7799742 | Equivalent circulating density control in deep water drilling A method of providing a substantially constant rheological profile of a drilling fluid over a temperature range of about 120° F. to about 40° F. includes adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive includes the react... | 09/21/2010 |
| 7709420 | Organophilic clays and methods for the preparation and use thereof Provided herein are organophilic clays that comprise a smectite clay modified by reaction with a protonated amphoteric surfactant. Also provided are fluids that comprise an oil and an organophilic clay comprising a smectite clay modified by reaction with a protonate... | 05/04/2010 |
| 7618925 | Shale hydration inhibition agent and method of use A method of using a water-base wellbore fluid in subterranean wells that penetrate through a subterranean formation containing a shale which swells in the presence of water. The well bore fluid includes, an aqueous based continuous phase, and a shale hydration inhib... | 11/17/2009 |
| 7572756 | Shale hydration inhibition agent and method of use A water-base fluid for use in drilling, cementing, workover, fracturing and abandonment of subterranean wells through a formation containing shale which swells in the presence of water. In one illustrative embodiment, the drilling fluid is composed of an aqueous bas... | 08/11/2009 |
| 7521398 | Shale hydration inhibition agent and method of use A method of using a water-base wellbore fluid in subterranean wells that penetrate through a subterranean formation containing a shale which swells in the presence of water. The well bore fluid includes, an aqueous based continuous phase, and a shale hydration inhib... | 04/21/2009 |
| 7514389 | High performance water-based drilling mud and method of use A water based drilling fluid for use in drilling a subterranean well through a subterranean formation that swells in the presence of water, the drilling fluid is formulated to include: an aqueous based continuous phase; a weight material; an optional shale hydration... | 04/07/2009 |
| 7435706 | Thinners for invert emulsions A method of reducing the viscosity of oil-based drilling fluids and well service fluids at low temperatures and a thinner compound for use in such drilling fluids and well service fluids is disclosed. The method comprises adding to said drilling fluids or well servi... | 10/14/2008 |
| 7384892 | Water-based drilling fluids A water-based drilling fluid composition includes water and at least one rheology modifier and/or fluid loss control agent, and at least one other ingredient of polymeric additive, inorganic salts, dispersants, shale stabilizers, weighting agents, or finely divided ... | 06/10/2008 |
| 7381689 | Methods for inhibiting hydrate blockage in oil and gas pipelines using amide compounds A method and an amide composition used therein for inhibiting, retarding, mitigating, reducing, controlling and/or delaying formation of hydrocarbon hydrates or agglomerates of hydrates. The method may be applied to prevent or reduce or mitigate plugging of conduits... | 06/03/2008 |
| 7377721 | Methods for using reversible phase oil-based drilling fluid Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type ... | 05/27/2008 |
| 7378378 | Rheology enhancers A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropyl... | 05/27/2008 |
| 7358215 | Quaternary ammonium salts as thickening agents for aqueous systems This invention relates to the use of alkyl amido quaternary ammonium salts, and formulations thereof, as thickening agents in aqueous based fluids, especially those used in oil field applications. The quaternary ammonium salts of the present invention exhibit improv... | 04/15/2008 |
| 7341107 | Viscoelastic acid An acidic viscoelastic surfactant fluid composition is formulated with an acid, for example hydrochloric acid, a cationic surfactant, for example a quaternary amine, and a break-enabling salt, for example NH4Cl. The fluid composition has low viscosity as ... | 03/11/2008 |
| 7341980 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of zwitterionic viscoelastic surfactant fluids by adding a rheology enhancer having the structure: R-(EO)x(PO)y—R′—OH in which R is an alkyl group that is straight chaine... | 03/11/2008 |
| 7332458 | Drilling fluid A drilling fluid for use in high oil viscosity formations containing tar, sand and oil entrained therein. The drilling fluid can be comprised of a polymer in an amount from between 0.05% and 5% by volume, a solvent in an amount from between 1% and 20% by volume and ... | 02/19/2008 |
| 7326670 | Well service fluid and method of making and using the same A well service fluid comprising one or more anionic viscoelastic surfactants and one or more polymers is described. The fluids can contain an aqueous or non-aqueous fluid and/or a buffer for adjusting the pH of the fracturing fluid. The well service fluid can be use... | 02/05/2008 |
| 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 |
| 7316991 | Composition and process for oil extraction The invention relates to a composition for use in the extraction of oil and to a method of extracting oil using the composition. The composition comprises components A, B and C in which: A is a first solid hydrophobic material which is in-soluble in an organic solve... | 01/08/2008 |
| 7312184 | Recovery composition and method A method and composition are described for improving recovery of oil from an oil reservoir. The method includes adding an effective amount of a fatty acid alkyl ester oil recovery composition to an oil reservoir and recovering oil from the reservoir. The composition... | 12/25/2007 |
| 7312183 | Shale hydration inhibition agent and method of use A water-base fluid for use in drilling, cementing, workover, fracturing and abandonment of subterranean wells through a formation containing shale which swells in the presence of water. In one illustrative embodiment, the drilling fluid is composed of an aqueous bas... | 12/25/2007 |
| 7311158 | Silicate-containing additives for well bore treatments and associated methods The present invention relates to methods and compositions for use in subterranean operations. More particularly, the present invention relates to additives comprising one or more silicates used to treat tar resident in a well bore, and methods of use. In one embodim... | 12/25/2007 |
| 7291651 | Carbon dioxide foamed fluids An aqueous viscoelastic surfactant (VES) fluid foamed or energized with carbon dioxide, in which the VES is more compatible with the carbon dioxide, is made by the addition of one or more than one synergistic co-surfactant. The synergist co-surfactant includes quate... | 11/06/2007 |
| 7287592 | Limited entry multiple fracture and frac-pack placement in liner completions using liner fracturing tool The present invention is directed to a method and apparatus for fracturing a subterranean formation which use a liner fracturing tool. The liner fracturing tool consists of a liner, with at least one jet extending through the liner. During fracturing operations, fra... | 10/30/2007 |
| 7279445 | Membrane forming in-situ polymerization for water based drilling fluids A method of increasing shale formation stability with a water based drilling fluid, the method including: delivering to the shale formation a drilling fluid formulated to include an aqueous fluid; a first reactant which is a soluble monomer, oligomer, or polymer wit... | 10/09/2007 |
| 7268100 | Shale inhibition additive for oil/gas down hole fluids and methods for making and using same An under-balanced drilling fluid additive is disclosed which reduces reactive shale and/or clay swelling during under-balanced drilling operations, where the additive includes an effective amount of a choline salt. A method for under-balanced drilling is also disclo... | 09/11/2007 |
| 7267291 | Additive for increasing the density of an oil-based fluid and fluid comprising such additive A wellbore fluid having an oleaginous phase and an additive for increasing the density of the wellbore fluid. The additive comprises solid colloidal particles coated with a dispersant during the comminution process of forming the particles. Exemplary starting materi... | 09/11/2007 |
| 7256159 | Fluid loss reducer for high temperature high pressure water based-mud application The present invention concerns a water-based drilling mud for utilization in the drilling of oil wells comprising an aqueous phase wherein the aqueous phase contains an oil soluble polymer in the form of a gel as a fluid loss reducer. The subject invention further r... | 08/14/2007 |
| 7237608 | Self diverting matrix acid A method is described for treating a subterranean formation with a low viscosity fluid system that contains a viscoelastic surfactant at a concentration too low to viscosify the fluid, but that is concentrated in the formation so that the fluid system gels. The flui... | 07/03/2007 |
| 7238646 | Invertible well bore servicing fluid A method for using an invert emulsion fluid in a well bore, comprising placing an invert emulsion fluid in a well bore, wherein the invert emulsion fluid comprises an oleaginous fluid, a non-oleaginous fluid and an emulsifier comprising one or more amines generally ... | 07/03/2007 |
| 7238649 | Powder composition A powder composition comprising viscoelastic surfactant forms, in aqueous solution, a viscoelastic wellbore treatment fluid. ... | 07/03/2007 |
| 7226896 | Organic emulsion-breaking formula and its use in treating well bores drilled in oil-base mud An organic based emulsion-breaking formulation for use in treating well bores drilled in oil-bearing mud that is not eco-toxic and is optimally compatible with formation fluids comprises: as the emulsion-breaking agent, at least on... | 06/05/2007 |
| 7222672 | Wellbore fluids containing additives for removing a filter cake and methods of using the same Wellbore servicing fluids and methods of using the same to service a wellbore in a subterranean formation are provided. A filter cake in the wellbore is contacted with the gravel packing fluid, which comprises an oil-soluble additive capable of removing the filter c... | 05/29/2007 |
| 7213645 | Methods of improving well bore pressure containment integrity Methods of improving the pressure containment integrity of subterranean well bores are provided. The methods include pumping a fracture sealing composition into the well bore that rapidly converts into a high friction pressure sealing composition which is impermeabl... | 05/08/2007 |
| 7207388 | Non-Damaging Fluid-Loss Pill and Method of Using the Same A fluid-loss pill that includes a brine solution and an effective amount of a viscoelastic surfactant is disclosed. The viscoelastic surfactant preferably includes at least one compound selected from the family of compounds described by | 04/24/2007 |
| 7205263 | Recyclable foamed fracturing fluids and methods of using the same Fracturing fluids and methods of fracturing a subterranean formation using such fluids are provided. A fracturing fluid having a first pH is foamed by introducing a gas to the fluid. The fracturing fluid comprises a surfactant that facilitates formation of the foam ... | 04/17/2007 |
