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| Number | Title | Issue Date |
| 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 |
| 7341617 | Corrosion and gas hydrate inhibitors having improved water solubility and increased biodegradability The invention provides the use of compounds of the formula (1) where R1, R2 are each independently C1- to C22-alkyl, C2- to C22-alkenyl, C6... | 03/11/2008 |
| 7244693 | Well treatment A method for the treatment of a hydrocarbon well comprising administering down the well polymeric particles impregnated with a well treatment chemical or precursor or generator thereof. The particles have a pore volume of at least 20%, and are prepared by a process ... | 07/17/2007 |
| 7216710 | Thiol/aldehyde corrosion inhibitors Methods of inhibiting corrosion comprising providing a corrosive environment; adding a corrosion inhibitor comprising a reaction product of a thiol compound and an aldehyde compound. Methods of acidizing a near well bore region of a subterranean formation comprising... | 05/15/2007 |
| 7208648 | Minimizing corrosion in a methanol-to-olefin effluent processing system The present invention is directed toward reducing corrosion in a methanol-to-olefin (MTO) effluent processing system, and particularly in the condensate removal system thereof, by injecting a neutralization agent into one or more target regions of the MTO effluent p... | 04/24/2007 |
| 7196040 | Microcapsule well treatment A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release devi... | 03/27/2007 |
| 7137401 | Drag reduction using maleated fatty acids Non-polymeric drag reducing agents in the form of maleated fatty acids and the esters thereof and the organic, inorganic or amine salts thereof are described herein. These additives are useful to reduce drag in hydrocarbon fluids and multi-phase fluids of hydrocarbo... | 11/21/2006 |
| 7135604 | Process for separating carbon dioxide from an oxygenate-to-olefin effluent stream The present invention is a process for removal of carbon dioxide from a reactor effluent stream comprising water, carbon dioxide and olefin(s), where a portion of the carbon dioxide is removed in a quenching step with a quench medium and more carbon dioxide is remov... | 11/14/2006 |
| 7102049 | Process for operating a quench device in an oxygenate-to-olefin production unit The present invention is a process for producing olefin(s) from oxygenates that is more effective than previously known processes at removing carbon dioxide from the effluent stream by operating a quench tower at a pH greater than 7.0. ... | 09/05/2006 |
| 7022652 | Compositions and methods for treating subterranean formations A solution containing a compound having the general formula XF.nH2O2, wherein X is K+, Na+ or NH4+ and n is an integer from 1 to 3 (e.g., a peroxysolvate of potassium fluoride compound such as potassi... | 04/04/2006 |
| 7008561 | Ether carboxylic acids based on alkoxylated mercaptobenzothiazoles and use of the same as corrosion inhibitors The present invention relates to compounds of formula (1) and the salts thereof which correspond to formula (2). In the formulae, A is C2- to C4-alkylene, x is a number from 1 to 100, y is a number... | 03/07/2006 |
| 7005555 | Process for separating and recycling oxygenate(s) to an oxygenate-to-olefin reactor The present invention is a process for producing olefin(s) from oxygenate(s). The process removes oxygenate(s) including carbon dioxide in the bottoms of the quench stream and recycles the oxygenate(s) back to the reactor. Carbon dioxide is removed from the quench b... | 02/28/2006 |
| 6995120 | Scale control composition for high scaling environments Barium sulfate and/or calcium carbonate scale inhibitor composition composed of a water-soluble polymer having incorporated phosphate functionality, the polymer being formed from at least one ethylenically unsaturated carboxylic acid monomer, at least one ethylenica... | 02/07/2006 |
| 6939483 | Brine fluids with improved corrosion properties It has been discovered that ammonia and amines are useful to increase the pH and corrosion resistance of high density brines, such as zinc bromide brines, without significantly reducing their densities. The ammonia or amine additive is preferably incorporated by con... | 09/06/2005 |
| 6894008 | Method of increasing pH of high-density brines It has been discovered that carbonate powders and bicarbonate powders are useful to increase the pH and corrosion resistance of high-density brines, such as zinc bromide brines, without significantly reducing their densities. The carbonates and/or bicarbonates shoul... | 05/17/2005 |
| 6887840 | Iron sulfide clean-up composition and method An iron sulfide cleaning composition is described, along with a process for using the iron sulfide cleaning composition. The iron sulfide cleaning composition is simple to use and effective in removing deposits of iron sulfide from hydrocarbon wells. The iron sulfid... | 05/03/2005 |
| 6866797 | Corrosion inhibitors and methods of use A class of quaternary ammonium compounds are found to be effective as corrosion inhibitors. These quaternary ammonium compounds may be used alone or in combination with additional components. For example, phosphate esters can be used with the quaternary ammonium com... | 03/15/2005 |
| 6764980 | Coated products and use thereof in oil fields An oil field production chemical, especially a scale inhibitor, is in the form of particles thereof carrying a coating e.g. of a dispersing agent. The coating may be polymeric such as an oligomeric polyacid polyester, a polymeric alkoxylated alcohol or a fatty acid ... | 07/20/2004 |
| 6743756 | Suspensions of particles in non-aqueous solvents Liquid suspensions of particles in non-aqueous solvents are extremely stable over long periods of time with minimum separation of the solvent and no hard packing of the dispersed particles. The suspensions enable a user to rapidly add the suspension to water and to ... | 06/01/2004 |
| 6723683 | Compositions for controlled release The present invention relates to biodegradable chemical compositions wherein core substrates, particularly oil well chemicals, are adsorbed onto particulate starch, particularly granular starch, providing a stable, controlled release formulation suitable for use in ... | 04/20/2004 |
| 6706669 | Method for inhibiting corrosion using phosphorous acid The present invention relates to a method for inhibiting high temperature of corrosion-prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of phosphorous acid, typically up to 1000 wppm, to the meta... | 03/16/2004 |
| 6695897 | Corrosion resistant system for performance drilling fluids utilizing formate brine A corrosion inhibited formulation for drilling compositions consisting essentially of an environmentally friendly corrosion inhibitor blended with an alkali metal formate. The corrosion inhibitor is prepared pursuant to a process including the steps of: ... | 02/24/2004 |
| 6620341 | Corrosion inhibitors for use in oil and gas wells and similar applications Anti-corrosion additives and processes useful for oil drilling and similar applications. Heteropoly complex anions of transitional metal elements can be added to an oil well drilling solution which includes a metallic salt, optionally in combination with ... | 09/16/2003 |
| 6613720 | Delayed blending of additives in well treatment fluids The effect of various chemical or biological agents in well treatment fluids can be delayed by sequestering the agents in the discontinuous phase of an emulsion for a period of time, before the emulsion is destabilized by exposure to at least one of: (1) ... | 09/02/2003 |
| 6593278 | Method for inhibiting corrosion using certain phosphorus and sulfur-free compounds The present invention relates to a method for inhibiting corrosion of corrosion-prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of certain sulfur and phosphorus-free aromatic compound... | 07/15/2003 |
| 6583091 | Method for inhibiting corrosion using 4-sulfophthalic acid The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of 4-sulfophthalic acid, typically up ... | 06/24/2003 |
| 6559104 | Method for inhibiting corrosion using certain aromatic acidic species The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of an additive aromatic compound tri-s... | 05/06/2003 |
| 6555506 | Corrosion inhibitors A method of preventing corrosion in pipelines comprising draining pipeline of all residual compounds, blowing through with nitrogen and rinsing with a corrosion inhibiting rinsing agent.... | 04/29/2003 |
| 6540943 | Method of inhibiting corrosion of metal equipment which is cleaned with an inorganic acid The corrosion of metal equipment which is cleaned with an inorganic acid is inhibited by treating the equipment with a corrosion inhibitor composition containing at least one quaternary ammonium compound, a sulfur-containing compound and a nonionic surfac... | 04/01/2003 |
| 6537950 | Method for inhibiting corrosion using triphenylstibine The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of triphenylstibine, typically up to 1... | 03/25/2003 |
| 6475431 | Corrosion inhibitors with low environmental toxicity A low toxic, biodegradable, water soluble and dispersant series of corrosion inhibitors are described. The method of inhibiting corrosion in aqueous medium by incorporating the inhibitor in PPM is provided. The corrosion inhibitor compromises an acrylic a... | 11/05/2002 |
| 6467492 | Corrosion inhibitors A method of preventing corrosion in pipelines comprising draining pipeline of all residual compounds, blowing through with nitrogen and rinsing with a corrosion inhibiting rinsing agent.... | 10/22/2002 |
| 6436880 | Well treatment fluids comprising chelating agents An acidic fluid that is useful in stimulation and workover operations, and in particular, for the control of iron in acidizing operations, the removal of alkaline earth carbonate scale in scale removal operations, and matrix or fracture acidizing operatio... | 08/20/2002 |
| 6436877 | Hydrate inhibition A method of inhibiting or retarding formation of hydrates from water and a lower alkane, such as methane or ethane, involves adding additives which comprise (i) a corrosion inhibitor and (ii) a salt which is of formula [R1 (R2)XR | 08/20/2002 |
| 6399547 | Well treatment fluids comprising mixed aldehydes An acidic fluid that is useful in stimulation and workover operations, and in particular, in matrix acidizing treatments, comprises an acid, such as hydrochloric acid; water; an aliphatic aldehyde having 1-10 carbon atoms; and an aromatic aldehyde having ... | 06/04/2002 |
| 6380136 | Coated products and use thereof in oil fields An oil field production chemical, especially a scale inhibitor, is in the form of particles thereof carrying a coating e.g. of a dispersing agent. The coating may be polymeric such as an oligomeric polyacid polyester, a polymeric alkoxylated alcohol or a ... | 04/30/2002 |
| 6326335 | Microencapsulated oil field chemicals Gelatin capsules containing oil field chemicals, preferably weighted with a heavy metal compound, are made more stable under certain conditions by the incorporation of a strong chelating agent. The microcapsules can provide an extended treatment period si... | 12/04/2001 |
| 6315045 | Methods and acidizing compositions for reducing metal surface corrosion and sulfide precipitation Methods and acidizing compositions for reducing the corrosion of the metal surfaces of tubular goods and the like and reducing the precipitation of metal sulfide from the acidizing compositions are provided. The methods basically comprise the steps of com... | 11/13/2001 |
| 6299836 | Gas treating solution corrosion inhibitor Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen sc... | 10/09/2001 |
| 6279656 | Downhole chemical delivery system for oil and gas wells The invention is the method of treating of a well, a formation, or both, with the solids, liquids, or apparatuses, by 1) encasing the solids, liquids, or apparatuses in a water-soluble shell, 2) conveying the encased solids, liquids, or gases to the prede... | 08/28/2001 |
