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| Number | Title | Issue Date |
| 6159907 | Method for treating a well employing a non-toxic, inexpensive fluid A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30° C. (-22° F.) and (II) a cetane index greater than 50, and com... | 12/12/2000 |
| 6110874 | Non-toxic, inexpensive synthetic drilling fluid A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30° C. (-22° F.) and (II) a cetane index greater than 50, and com... | 08/29/2000 |
| 6034037 | Non-toxic inexpensive synthetic drilling fluid A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30° C. (-22° F.) and (II) a cetane index greater than 50, and com... | 03/07/2000 |
| 5957203 | Ultra-high temperature stable gels Cationic polymer-containing gels are stable at elevated temperatures in soft and hard waters.... | 09/28/1999 |
| 5958845 | Non-toxic, inexpensive synthetic drilling fluid A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30° C. (-22° F.) and (II) a cetane index greater than 50, and com... | 09/28/1999 |
| 5879433 | Method and apparatus for reducing the acid gas and/or inert particulate content of steam One or more contaminants selected from the group consisting of acidic gases, inert particulates, and mixtures thereof are removed from steam by contacting the contaminated steam with a nonaqueous sorbent such as crystalline molecular sieves, silica gels, ... | 03/09/1999 |
| 5858245 | Inhibition of silicate scale formation A method for controlling fouling of a production or reinjection well, a flashing vessel or a heat-exchange surface exposed to a high-enthalpy geothermal brine that forms metal/silicon-containing scale comprises the addition of a metal complexing agent to ... | 01/12/1999 |
| 5788781 | Method for cleaning an oil-coated substrate A method for cleaning oil-contaminated substrates employing a composition includes a diluent oil, a first surfactant having a HLB value of at least 10, and a second surfactant having a higher HLB value. The difference in the HLB values of the first and se... | 08/04/1998 |
| 5780407 | Solvent soaps and methods employing same Compositions comprising (a) a surfactant and (b) a diluent oil are employed in oil-based drilling fluids and processes for cleaning oil-contaminated substrates (e.g., oil-contaminated animals, drill cuttings) as well as in processes for cementing well cas... | 07/14/1998 |
| 5762141 | Ultra-high temperature stable gels Cationic polymer-containing gels are stable at elevated temperatures in soft and hard waters.... | 06/09/1998 |
| 5723423 | Solvent soaps and methods employing same Compositions comprising (a) a surfactant and (b) a diluent oil are employed in oil-based drilling fluids and processes for cleaning oil-contaminated substrates (e.g., oil-contaminated animals, drill cuttings) as well as in processes for cementing well cas... | 03/03/1998 |
| 5710111 | Solids-free wellbore fluid Solids-free, essentially all-oil and invert emulsion wellbore fluids are employed in well drilling, completion, and workover operations. Techniques for remediating dense aromatic solvents wellbore fluids entail removal and/or dissolution of particulate ma... | 01/20/1998 |
| 5700763 | Thermally stable oil-based drilling fluid Oil-base drilling fluids containing a non-sulfonated polymer and/or a non-organophilic clay maintain desirable rheological properties at elevated temperatures.... | 12/23/1997 |
| 5696058 | Solids-free, essentially all-oil wellbore fluid A solids-free, essentially all-oil wellbore fluid comprises an organic fluid having (i) a melting point less than about 20° C. (about 68° F.), (ii) a flash point greater than about 54.4° C. (about 130° F.), and (iii) a dipole moment greater than 0 deb... | 12/09/1997 |
| 5635457 | Non-toxic, inexpensive synthetic drilling fluid A non-toxic, inexpensive synthetic fluid for use in wellbore fluids (e.g., drilling fluids) is selected from the group consisting of (A) fluids having (I) a pour point greater than about -30° C. (-22° F.) and (II) a cetane index greater than 50, and com... | 06/03/1997 |
| 5634984 | Method for cleaning an oil-coated substrate A method for cleaning oil-contaminated substrates employing a composition composed of a diluent oil, a first surfactant having a HLB value of at least 10, and a second surfactant having a higher HLB value. The difference in the HLB values of the first and... | 06/03/1997 |
| 5629270 | Thermally stable oil-base drilling fluid Oil-base drilling fluids containing a non-sulfonated polymer and/or a non-organophilic clay maintain desirable rheological properties at elevated temperatures.... | 05/13/1997 |
| 5617920 | Method for modifying gelation time of organically crosslinked, aqueous gels Enhanced gel properties (e.g., faster gel time, higher attainable gel strengths) are achieved by reducing the pH and/or increasing the salt of a monovalent and/or divalent cation concentration of an aqueous reaction medium in which a polymer is reacted wi... | 04/08/1997 |
| 5614476 | Method for reducing the crystallization temperature of a carbon disulfide precursor-containing solution and resulting compositions Compounds selected from the group consisting of ammonia, ammonium-containing compounds, urea, urea homologues and analogues, and mixtures thereof surprisingly lower the crystallization temperature of aqueous, carbon disulfide precursor (e.g., thiocarbonat... | 03/25/1997 |
| 5601721 | Method for reducing the selenium concentration in an oil refinery effluent Selenium exists in oil refinery stripped sour water as selenocyanate and can be effectively removed using an acrylic, strong base, anion exchange column or stannous chloride. The acrylic, strong base, anion exchange column can also be employed to remove a... | 02/11/1997 |
| 5593955 | Method for reducing the pour point of an oil and compositions for use therein Compounds selected from the group consisting of urea, urea homologues and analogues, and mixtures thereof are employed to synergistically increase the dewaxing efficacy of aqueous, carbon disulfide precursor (e.g., thiocarbonate)-containing solutions.... | 01/14/1997 |
| 5556832 | Solids-free, essentially all-oil wellbore fluid A solids-free, essentially all-oil wellbore fluid comprises (a) an organic fluid having (i) a melting point less than about 20° C. (about 68° F.), (ii) a flash point greater than about 54.4° C. (about 130° F.), and (iii) a dipole moment greater than 0... | 09/17/1996 |
| 5541149 | Compositions comprising a phosphonic compound, and a sulfuric acid-amide adduct and methods for controlling vegetation using such compositions A composition exhibiting increased defoliation and growth inhibition efficacy comprises the mixture of an amide-sulfuric acid adduct and a phosphonic acid and/or phosphonic acid derivative or salt.... | 07/30/1996 |
| 5494498 | Methods for using concentrated nitrogen-containing fertilizers Urea increases the solute content of a fertilizer comprising water and at least two different nitrate-containing compounds selected from the group consisting of ammonium nitrate, alkali metal nitrates, and alkaline earth metal nitrates. In addition, urea ... | 02/27/1996 |
| 5486312 | High temperature stable gels Gels stable in a subterranean formation at a temperature greater than about 175° F. are formed using, inter alia, a stabilizing agent (e.g., a buffer having a buffering capacity at a pH of at least about 8 and/or a chelating agent).... | 01/23/1996 |
| 5472050 | Use of sequential fracturing and controlled release of pressure to enhance production of oil from low permeability formations Hydrocarbon production from a low permeability formation is increased by fracturing a production interval in the formation and restricting the release of pressure from the fracture to lengthen the time that the reservoir pressure remains above the fractur... | 12/05/1995 |
| 5417737 | Concentrated nitrogen-containing fertilizers having increased alkaline earth metal uptake Urea increases the solute content of a fertilizer comprising water and at least two different nitrate-containing compounds selected from the group consisting of ammonium nitrate, alkali metal nitrates, and alkaline earth metal nitrates. In addition, urea ... | 05/23/1995 |
| 5418217 | Composition for selectively reducing subterranean formation permeability Visible gels are formed by mixing an inorganic crosslinking agent with a low viscosity aqueous solution having a low polyacrylamide concentration and devoid of polymers containing a vicinal diol pendant group. The visible gels are employed to reduce the w... | 05/23/1995 |
| 5397557 | Tetrathiocarbonate batch process Salts of tetrathiocarbonic acid are produced by a batch process in which a hydroxide, hydrogen sulfide, sulfur and carbon disulfide are reacted sequentially. The salts are produced as aqueous solutions having concentrations of upwards of 30 percent by wei... | 03/14/1995 |
| 5393778 | Oligomeric thiocarbonates Oligomeric thiocarbonates such as hexathiodicarbonate salts and thioesters are used as pesticides and preservatives. Certain oligomeric thiocarbonate salts, notably quaternary ammonium hexathiodicarbonates, are prepared. The compounds are stabilized with ... | 02/28/1995 |
| 5384329 | Oligomeric thiocarbonates Oligomeric thiocarbonates such as hexathiodicarbonate salts and thioesters are used as pesticides and preservatives. Certain oligomeric thiocarbonate salts, notably quaternary ammonium hexathiodicarbonates, are prepared. The compounds are stabilized with ... | 01/24/1995 |
| 5360782 | Aqueous solution comprising a thiocarbonate, a sulfide, and an ammoniacal compound Aqueous thiocarbonate solutions are stabilized by the addition of base, sulfide and/or polysulfide, and the stability and safety of the more concentrated solutions containing 1 weight percent or more equivalent CS2 as a thiocarbonate are achiev... | 11/01/1994 |
| 5353869 | Method and apparatus for producing excessively hot hydrogeothermal fluids A method and system, for reducing the temperature of a hydrogeothermal fluid, entails directly or indirectly contacting a self-rising, heated hydrogeothermal fluid with a cooling fluid to cool the hydrogeothermal fluid before it enters and/or as it rises ... | 10/11/1994 |
| 5346614 | Removal of hydrogen sulfide from an oil-containing mixture having a continuous aqueous phase A method and system for removing hydrogen sulfide from a continuous aqueous phase-containing fluid without forming a sulfur sludge. Oil is either initially present in the fluid or added thereto.... | 09/13/1994 |
| 5335733 | Method for delaying gelation of a gelable polymer composition injected into a subterranean formation The gelation of a gelable composition is delayed by using, inter alia, a crosslinking rate retardant selected from the group consisting of epoxides, ethers, and mixtures thereof.... | 08/09/1994 |
| 5333698 | White mineral oil-based drilling fluid A wellbore fluid (e.g., a drilling, completion, packer, or fracturing fluid) comprises (a) at least one additive selected from the group consisting of emulsifiers, wetting agents, viscosifiers, weighting agents, fluid loss control agents, proppants for us... | 08/02/1994 |
| 5322121 | Hydraulic fracturing technique employing in situ precipitation A fracturing fluid comprises (a) a carrier, (b) a nucleating agent capable of reducing the concentration of scale-forming ingredients and/or natural occurring radioactive materials (NORMs) present in an aqueous subterranean fluid, and optionally (c) an in... | 06/21/1994 |
| 5291949 | Method for inhibiting caustic flood breakthrough Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.... | 03/08/1994 |
| 5290339 | Platinum recovery Geothermal brine and other platinum-containing solutions are passed through a carbon-containing zone to recover platinum from the aqueous medium.... | 03/01/1994 |
| 5277886 | Method for reducing the risk in transporting and storing liquid ammonia The addition of a nucleating or coalescing agent (e.g., urea) to liquid ammonia reduces the size and persistence of a deadly, fog-like cloud of ammonia droplets that tend to form when liquid ammonia is accidentally released to the atmosphere. In addition,... | 01/11/1994 |
