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| Number | Title | Issue Date |
| 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 |
| 7264052 | Methods and compositions for consolidating proppant in fractures Improved methods and compositions for consolidating proppant in subterranean fractures are provided. In certain embodiments, the hardenable resin compositions may be especially suited for consolidating proppant in subterranean fractures having temperatures above abo... | 09/04/2007 |
| 7131492 | Divinyl sulfone crosslinking agents and methods of use in subterranean applications This invention relates to divinyl sulfone crosslinking agents, viscosified treatment fluids, and methods of using these compositions in applications wherein viscosified treatment fluids may be used. In one embodiment, this invention provides a method of treating a p... | 11/07/2006 |
| 6350721 | Fluids and techniques for matrix acidizing Liquids comprised solely of anions and cations ("ionic liquids") are disclosed as novel components of fluids (and techniques relying upon those fluids) for stimulation of hydrocarbon wells. In particular, the fluids disclosed are useful in matrix acidizin... | 02/26/2002 |
| 6117364 | Acid corrosion inhibitor An acid corrosion inhibitor composition is provided for petroleum wells and water wells subjected to stimulation with acid solutions. The inhibitor combines cinnamaldehyde and an organo-sulfur compound. The inhibitor provides a reduced rate of corrosion a... | 09/12/2000 |
| 5585334 | Process for dissolving sulfur A process which can be used to dissolve sulfur deposits or sulfur plugs in gas wells, oil wells, vessels, or conduits for transporting a fluid containing sulfur is provided. The process comprises contacting the sulfur deposits or sulfur plugs under condit... | 12/17/1996 |
| 5242672 | Process for removing sulfur from organic polysulfides A process for removing sulfur from an organic polysulfide by reaction with an aqueous stripping solution of at least one sulfide salt and/or hydrosulfide salt in a multi-stage, continuous, countercurrent flow, reaction system wherein the sulfur is strippe... | 09/07/1993 |
| 5186848 | Preparing sulfur solvent compositions comprising treating a sulfide and polyalkyleneoxyamine or polyalkyleneoxypolyamine mixture with an alkylamine or alkanolamine A process is disclosed for preparing a composition having improved solvent power for sulfur wherein a composition comprising a sulfide having the general formula RSSaSR' wherein R and R' are defined carbon-containing radicals and a is 0 to 3, and a cataly... | 02/16/1993 |
| 5028343 | Stabilized sulfur dissolving compositions A composition of matter is disclosed which includes a major proportion of an organic di- or polysulfide, a catalytic amount of an amine/mercaptan mixture, and a stabilizing component in an amount sufficient to inhibit loss of catalytic activity in storage... | 07/02/1991 |
| 5002673 | Corrosion inhibitor and method of use A corrosion inhibitor formulation for use in well treatig acids includes a highly polar aprotic solvent having dissolved therein (a) a complex of a metal compound and a quaternary ammonium compound and (b) a dispersant capable of dispersing the complex in... | 03/26/1991 |
| 4819729 | Method for recovering petroleum using oligomeric surfactants A method for recovering petroleum from a subterranean, petroleum-containing formation. It includes injecting into said formation a formulation comprising an oligomeric surfactant wherein said oligomeric surfactant has the following formula: wherein R is a... | 04/11/1989 |
| 4804485 | Polyalkyleneoxyamine catalysts for dialkyl disulfides and/or polysulfides used in dissolving sulfur A composition, useful for dissolving sulfur, which comprises a major amount of a disulfide or polysulfide and a catalyst comprising one or more polyalkyleneoxyamines or polyamines, and methods for using the composition in a system to prevent sulfur-pluggi... | 02/14/1989 |
| 4759908 | Polythioether corrosion inhibition system A series of water-dispersible and oil-dispersible corrosion inhibiting solutions are disclosed which contain a polythioether represented by the formula ##STR1## wherein R1, R2, R3 and R4 are H, a methyl gro... | 07/26/1988 |
| 4728447 | Process and product for dissolving sulfur A solvent for sulfur consisting of a dialkyl disulfide which is free of any basic substance. It is obtained from a commercial dialkyl disulfide by treatment with a reagent capable of eliminating or blocking the basic substances, particularly amines, which... | 03/01/1988 |
| 4664193 | Composition and method for corrosion inhibition A corrosion-inhibiting composition and method of inhibiting corrosion on metal surfaces are described. The composition comprises a reaction product of (a) a first constituent selected from an epoxide having an average of at least about one vicinal epoxide... | 05/12/1987 |
| 4655287 | Composition and method for corrosion inhibition A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises the reaction product of a first component selected from an epoxy resin, an epoxidized alkene and a substrate having at l... | 04/07/1987 |
| 4650594 | Composition and method for corrosion inhibition A corrosion-inhibiting composition and method of inhibiting corrosion on metal surfaces are described. The composition comprises a reaction product of (a) a first constituent selected from an epoxide having an average of at least about one vicinal epoxide... | 03/17/1987 |
| 4637833 | Inhibiting corrosion: benzylsulfinylacetic acid or benzylsulfonylacetic acid Hydrocarbyl-substituted sulfinyl and sulfonyl carboxylic acids are effective corrosion inhibitors for surfaces of various metals. In one embodiment, mineral acid compositions such as aqueous hydrochloric acid metal cleaning solutions exhibit diminished co... | 01/20/1987 |
| 4608191 | Composition and method for corrosion inhibition A composition is provided which, when applied to a metal surface, forms a corrosion-inhibiting film thereon. The composition comprises the reaction product of a first component selected from an epoxy resin, an epoxidized alkene and a substrate having at l... | 08/26/1986 |
| 4543193 | Process for preventing the precipitation of elementary sulphur in riser pipes of probes for natural gas Process for preventing the precipitation of elementary sulfur in the riser pipes of probes for natural gas including a solvent for sulfur. For the dissolution of the precipitating elementary sulfur an ester of an optionally mono- or poly-unsaturated fatty... | 09/24/1985 |
| 4528383 | Substituted cyclic and heterocyclic methane sulfonates There are provided compounds which are alkyl sulfonates substituted on a 5-membered heterocyclic or cyclic ring. The hetero-substituents of the ring may be O, S, R2 N, R3 R4+ N | 07/09/1985 |
| 4495336 | Mercapto-polycarboxylic acids This invention relates to a sulfidic process of inhibiting corrosion which comprises heating a system with a sulfur-containing polycarboxylic acid or derivatives thereof having carboxylic groups attached to adjacent carbons.... | 01/22/1985 |
| 4487702 | Substituted heterocyclic methane sulfonates as sacrificial agents in enhanced oil recovery There is provided a sacrificial agent for enhanced oil recovery which is a 5-membered heterocyclic ring having a methane sulfonate group substituted at the 3-position and a methyl group substituted in the 4-position. Methods of using these sacrificial age... | 12/11/1984 |
| 4382003 | Breaker system for hydraulic fracturing fluids Aqueous compositions having properties making them suitable for use as a hydraulic fracturing fluids are disclosed. These compositions comprise (a) an uncrosslinked aqueous polysaccharide solution, and (b) a 4,4'-thiodiphenol. Ingredient (b) acts as a "br... | 05/03/1983 |
| 4379490 | Method for removal of asphaltene depositions with amine-activated disulfide oil A method for treating and removing unwanted asphaltene deposits from oil and gas wells, surface equipment, flow lines, and pore spaces of oil-baring formations comprises treatment with an amine-activated aliphatic disulfide oil as an asphaltene solvent. I... | 04/12/1983 |
| 4350600 | Method and composition for inhibiting corrosion in high temperature, high pressure gas wells A relatively nonvolatile, high molecular weight corrosion inhibitor and inhibitor carrier produced by activating a dialkyl disulfide oil by the addition of a relatively high molecular weight aliphatic amine (e.g., a fatty amine, particularly the N-alkyl-1... | 09/21/1982 |
| 4339349 | Corrosion inhibitors for limited oxygen systems This invention relates to compositions useful in a limited oxygen system characterized by containing at least one of the following: (1) sulfur-oxygen phosphates (2) quaternaries (3) polyphosphate esters (4) cyclic amidines (5) trithiones. Where the limited oxygen s... | 07/13/1982 |
| 4295979 | Method and composition for inhibiting corrosion in high temperature, high pressure gas wells A relatively nonvolatile, high molecular weight oil soluble corrosion inhibitor carrier produced by adding at least 40 parts by weight of elemental sulfur per 100 parts by weight dialkyl disulfide oil to an amine activated dialkyl disulfide oil which exhi... | 10/20/1981 |
| 4290900 | Method and composition for removing elemental sulfur from high temperature, high pressure wells and flow lines A relatively nonvolatile, high molecular weight sulfur solvent produced by activating a dialkyl disulfide oil by the addition of a relatively high molecular weight predominantly aliphatic amine (e.g., a N-alkyl-1,3-propane diamine) and optionally further ... | 09/22/1981 |
| 4248717 | Method for removing elemental sulfur from high temperature, high pressure wells and flow lines A relatively nonvolatile, high molecular weight sulfur solvent produced by adding at least 40 parts by weight of elemental sulfur per 100 parts by weight dialkyl disulfide to an amine activated dialkyl disulfide oil. Such a sulfur solvent is particularly ... | 02/03/1981 |
| 4239630 | Method for dissolving sulfur deposits rapidly A method for dissolving a deposit of elemental sulfur by contacting the deposit with dialkyl disulfides catalyzed with an aliphatic amine in which a small amount of sulfur is added to the disulfide amine mixture before it is used as a sulfur solvent. The ... | 12/16/1980 |
| 4166038 | Surfactant waterflooding employing amphoteric sulfonium sulfonates Waterflood process for the recovery of oil from a subterranean oil reservoir involving injecting into the reservoir an aqueous solution of an amphoteric surfactant having an inner sulfonium group linked to a terminal sulfonate group. The amphoteric sulfon... | 08/28/1979 |
