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| Number | Title | Issue Date |
| 8105989 | Water based completion and displacement fluid and method of use A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid ... | 01/31/2012 |
| 8012914 | Ortho ester breakers for viscoelastic surfactant gels and associated methods Many methods are provided including a method comprising: providing a surfactant gel having a first viscosity that comprises an aqueous base fluid and a surfactant; placing the surfactant gel into a subterranean formation at a pressure sufficient to create or enhance... | 09/06/2011 |
| 8008236 | Ortho ester breakers for viscoelastic surfactant gels and associated methods Many methods are provided including a method comprising: providing a surfactant gel having a first viscosity that comprises an aqueous base fluid and a surfactant; providing an ortho ester breaker; contacting the surfactant gel with the ortho ester breaker; allowing... | 08/30/2011 |
| 7989404 | Compositions and methods for gas well treatment A microemulsion system is disclosed which comprises a solvent subsystem, a co-solvent subsystem and a surfactant subsystem comprises at least one monoalkyl branched propoxy sulfate anionic surfactant, where the microemulsion system are useful in drilling, producing,... | 08/02/2011 |
| 7968501 | Crosslinker suspension compositions and uses thereof A delayed crosslinker system useful in downhole treatment fluids is disclosed. The crosslinker system comprises water-reactive solids, a non-aqueous, non-oily, hygroscopic liquid, a suspension aid, and an optional polyol. The crosslinker system may be prepared at a ... | 06/28/2011 |
| 7923419 | Methods and compositions for thermal insulation Unwanted heat loss from production tubing or uncontrolled heat transfer to outer annuli is inhibited by introduction into the annuli a thermal insulating packer fluid or a riser fluid containing a zwitterionic surfactant, an alcohol and a brine. The viscosity of the... | 04/12/2011 |
| 7863225 | Defoaming methods and compositions Embodiments of the present invention are directed to defoaming methods and compositions for well treatment fluids. An exemplary embodiment of the present invention provides a method of defoaming a well treatment fluid, comprising combining a defoaming composition wi... | 01/04/2011 |
| 7858564 | Well fluid comprising a fluorinated liquid phase A well drilling, completion or workover fluid has a continuous phase of the fluid essentially consists of a liquid fluorinated compound. In a variant, the liquid fluorinated compound is a perfluorinated compound. ... | 12/28/2010 |
| 7795186 | Fluid-loss control pills comprising breakers that comprise orthoesters and/or poly(orthoesters) and methods of use Provided herein are methods and compositions for generating acids for use downhole, for example, to break fluid-loss control pills. The delayed-release acid breakers of the present invention comprise orthoesters and/or poly(orthoesters). ... | 09/14/2010 |
| 7741253 | Methods and compositions for crosslinking polymers with boronic acids The present invention provides a method of forming a viscosified treatment fluid comprising: providing a treatment fluid that comprises water and a gelling agent; contacting the treatment fluid with a boronic acid crosslinking agent so as to form a crosslinked gelli... | 06/22/2010 |
| 7713917 | Thermal insulation compositions containing organic solvent and gelling agent and methods of using the same A thermal insulating composition containing an organic solvent of low thermal conductivity and a gelling agent hydratable in the solvent is useful for controlling heat transfer from a production tubing or transfer pipe in a wellbore to a surrounding annuli and/or th... | 05/11/2010 |
| 7713916 | Orthoester-based surfactants and associated methods Provided are treatment fluids that comprise a base fluid and an orthoester-based surfactant. In some instances, the treatment fluid may have a pH of about 8.5 or greater. Also provided are emulsified treatment fluids that comprise an oleaginous phase, an aqueous pha... | 05/11/2010 |
| 7687441 | Boronic acid networking agents and associated methods In one embodiment, the present invention provides a method of increasing the viscosity of a treatment fluid comprising the steps of: adding a networking agent to the treatment fluid, wherein the networking agent is represented by the formula: Y—X—[B(OR)2]n, wher... | 03/30/2010 |
| 7662756 | Methods for effecting controlled break in pH dependent foamed fracturing fluid A fluid for use in a subterranean formation penetrated by a wellbore, the fluid comprising: (a) water; (b) an orthoester; and (c) a surfactant comprising a tertiary alkyl amine ethoxylate generally represented by the following formula: (CH2—CH... | 02/16/2010 |
| 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 |
| 7427584 | Treating composition Treating compositions containing mutual solvents suitable for forming and maintaining single-phase aqueous fluid treating compositions containing very high concentrations of acids and/or chelating agents are described. Methods of use of these treating compositions f... | 09/23/2008 |
| 7419937 | Method for providing treatment chemicals in a subterranean well A method of delivering chemicals such as scale inhibitor into a wellbore producing fluids includes providing the chemicals, in a slow-release form, in a container located in the path of the production fluids so that the production fluids pass through the container. ... | 09/02/2008 |
| 7409994 | Drilling well with drilling fluid of fluid phase and weighting agent An additive that increases the density of fluids used in a wellbore during the construction or repair of oil, gas, injection, water, or geothermal wells comprises In one illustrative embodiment the additive comprises a weighting agent, and more preferably an ultra-f... | 08/12/2008 |
| 7407916 | Foamed treatment fluids and associated methods Foamed treatment fluids comprising water, a gas, and a foaming and foam stabilizing surfactant mixture comprising an alkali salt of an alkyl ether sulfate, wherein the alkali salt of the alkyl ether sulfate comprises an alkali salt of a C6-10 alkyl ether ... | 08/05/2008 |
| 7405183 | Methods and compositions for crosslinking polymers with boronic acids The present invention provides a method of forming a viscosified treatment fluid comprising: providing a treatment fluid that comprises water and a gelling agent; contacting the treatment fluid with a boronic acid crosslinking agent so as to form a crosslinked gelli... | 07/29/2008 |
| 7402549 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer selected from partially hydrolyzed polyvinyl ester and partially hydrolyzed polyacryl... | 07/22/2008 |
| 7392845 | Method of treating oil or gas well with biodegradable emulsion A biodegradable water-in-synthetic oil base emulsion, effective in the removal of filter cakes, consists of an external phase of a surfactant emulsified in a paraffinic base oil. The emulsion is particularly effective in breaking-down the interfacial rheological pro... | 07/01/2008 |
| 7387987 | Rheology modifiers 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 polymeric rheology enhancer selected from polypropylene glycols and block copolyme... | 06/17/2008 |
| 7387986 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of an amphiphilic polymeric rheology enhancer containing at least one portion that is a partially hydrolyzed... | 06/17/2008 |
| 7380606 | Composition and process for well cleaning Disclosed is a microemulsion well treatment microemulsion that is formed by combining a solvent-surfactant blend with a carrier fluid. In preferred embodiments, the solvent-surfactant blend includes a surfactant and a solvent selected from the group consisting of te... | 06/03/2008 |
| 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 |
| 7354886 | Pumpable multiple phase compositions for controlled release applications downhole Pumpable multiple phase vesicle compositions carry agents and components downhole or through a conduit, and controllably releasing them at a different place and time by breaking the compositions. In one non-limiting embodiment the pumpable multiple phase vesicles ha... | 04/08/2008 |
| 7348297 | Topical defoamer and demulsifier Compounds of the formula H(CH2)zCOO—[C2H4O]xCyH2y+1 where z is 0-2, x is an integer from 1 to 5 and y is an integer from 4-9 are used as emulsion breakers and defoamers in formation treat... | 03/25/2008 |
| 7345012 | Foamed viscoelastic surfactants A method for increasing the foam stability of foams made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of an amphiphilic polymeric foam stabilizer containing at least one portion that is a partially h... | 03/18/2008 |
| 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 |
| 7331388 | Horizontal single trip system with rotating jetting tool A method for completing a well in a single trip is described, which includes inserting a completion tool assembly into the wellbore. The completion tool assembly includes a gravel packing assembly having a central channel substantially therethrough and a service too... | 02/19/2008 |
| 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 |
| 7320952 | Additive for viscoelastic fluid Composition and method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a co-gelling agent selected from triblock oligomeric compounds having hydrophilic (for exam... | 01/22/2008 |
| 7318477 | Method and composition for cleaning a well bore prior to cementing The invention generally relates to a spacer system for cleaning a section of a subterranean well borehole and casing prior to cementing. The spacer system of the invention comprises a at least one alkyl ether citrate and, optionally, at least one alcohol ethoxylate.... | 01/15/2008 |
| 7316742 | Subterranean fluids having improved environmental characteristics and methods of using these fluids in subterranean formations Subterranean fluids are provided that have improved environmental characteristics, and more particularly, subterranean fluids are provided that include a hydraulic cement in an invert emulsion. Methods of using such fluids in subterranean operations also are provide... | 01/08/2008 |
| 7304019 | Concentrated suspensions Suspensions are provided of water-soluble materials in non-aqueous carrier fluids using suspension agents that include organophilic clays. Methods of forming such suspensions are provided. Methods are also provided for using such suspensions to prepare aqueous solut... | 12/04/2007 |
| 7303012 | Propped fracture with high effective surface area Propped fractures in formations from which fluids are produced are described that have wormholes extending out into the formations from the faces of the fractures at locations distant from boreholes. Methods are given for creating such propped fractures having wormh... | 12/04/2007 |
| 7300973 | Composition for recovering hydrocarbon fluids from a subterranean reservoir A composition comprising expandable cross linked polymeric microparticles having an unexpanded volume average particle size diameter of from about 0.05 to about 10 microns and a cross linking agent content of about 6,000 to less than about 9,000 ppm of labile cross ... | 11/27/2007 |
| 7296627 | Method for simultaneous removal of asphaltene, and/or paraffin and scale from producing oil wells A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and mineral acid. This one step method provides for the simultaneously cleaning/removal of asphaltine... | 11/20/2007 |
| 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 |
