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| Number | Title | Issue Date |
| 6482762 | NOx conversion catalyst rejuvenation process A method for cleaning and rejuvenating an at least partially spent de-NOx catalyst comprising a porous ceramic metal oxide material containing a vanadium oxide and coated on a metal support by cleaning the catalyst with an oxalic acid solution ... | 11/19/2002 |
| 6461497 | Reformulated reduced pollution diesel fuel A reformulated diesel fuel meeting the requirements of ASTM D975-96a for a low-sulfur number 2 diesel fuel and providing reduced emission benefits relative to a certified diesel fuel, certified under Section 2282(g) Title 13, California Code of Regulation... | 10/08/2002 |
| 6353988 | Method of installing a highly tensioned suspended pipeline A highly tensioned, suspended pipeline (HTSP) which is especially useful in permafrost regions, rugged terrain, and active seismic fault areas. Basically, the pipeline is comprised of segments which are fluidly connected together to form the desired lengt... | 03/12/2002 |
| 6302206 | Treatment for shut-in gas well A method for treating a gas well to prevent any fresh water, which may have condensed out of the gas stream, from damaging the gas producing formation during the shut-in period. The well is shut-in and then an additive, e.g. a salt, alcohol, etc., is inje... | 10/16/2001 |
| 6283213 | Tandem spacer fluid system and method for positioning a cement slurry in a wellbore annulus A method and a tandem spacer consisting of an aqueous lead spacer fluid and an aqueous tail spacer fluid for displacing a drilling fluid from an annular space in a wellbore with a cement slurry is disclosed. The aqueous lead spacer fluid and the aqueous t... | 09/04/2001 |
| 6273192 | Method for strengthening a subterranean formation A method for strengthening a subterranean formation by injecting an aqueous gellable composition containing a cross-linkable polymer into the subterranean formation through a wellbore to increase the strength of the subterranean formation while retaining ... | 08/14/2001 |
| 6258332 | Apparatus and method for collecting and recycling a petroleum by-product The present invention provides for an apparatus and method for collecting and recycling a petroleum by-product such as hydrocarbon residue from crude oil. The apparatus comprises a container having a top, bottom, and sides, an internal heating element, an... | 07/10/2001 |
| 6250689 | Reinforced tube joint A reinforced tube joint formed by a first tube having an end portion; a stress collar fitted, with an interference fit, about the first tube so that the end portion of the first tube extends beyond the stress collar; and a second tube having an end rigidl... | 06/26/2001 |
| 6248794 | Integrated process for converting hydrocarbon gas to liquids The present invention is an integrated process for converting light hydrocarbon gas to heavier hydrocarbon liquids. In each embodiment, a Fischer-Tropsch (FT) process comprising a thermal reformer and a reactor containing an FT catalyst is combined with o... | 06/19/2001 |
| 6236894 | Petroleum production optimization utilizing adaptive network and genetic algorithm techniques A computer system and method of operating the same to optimize the operating conditions of a petroleum production field, in which a plurality of wells are arranged according to drill sites, and connected to one or more central processing facilities, is di... | 05/22/2001 |
| 6234183 | Method for removing deposits comprising heavy hydrocarbonaceous materials and finely divided inorganic materials from a flow line using a surfactant composition A method and composition for removing deposits of heavy hydrocarbonaceous materials and finely divided inorganic particulate matter from wellbore and flowline surfaces using a composition containing an alkyl polyglycoside, an ethoxylated alcohol, a causti... | 05/22/2001 |
| 6216786 | Method for forming a fracture in a viscous oil, subterranean formation A method for forming a fracture in a viscous oil subterranean formation wherein a data-fracturing operation is carried out to first determine the "leak-off" rate for the formation and then the formation is fractured with a slurry wherein the liquid from t... | 04/17/2001 |
| 6192316 | Fracture discrimination using borehole frequency response of stoneley waves A computer system (30) and method of operating the same to analyze well log data so as to distinguish fractures from drilling artifacts, such as caves, washouts, and breakouts, is disclosed. According to the disclosed system and method, a Stoneley wave we... | 02/20/2001 |
| 6168708 | Method for recovery and recycling of hydrocarbon residue The present invention provides for a method for recovering and recycling a hydrocarbon residue from a petroleum material such as crude oil, where the hydrocarbon residue is a waxy solid material. The method comprises providing the hydrocarbon residue in a... | 01/02/2001 |
| 6166546 | Method for determining the relative clay content of well core A method for determining a relative clay content of at least a portion of a well core taken from a subterranean geologic formation by: determining the relationship of the clay content of the well core portion to the dielectric constant of the well core po... | 12/26/2000 |
| 6166103 | Aqueous gelable compositions with delayed gelling times An aqueous gelable composition containing an organic, water soluble polymer cross-linkable with a multivalent cation and a retarded cross-linking system consisting essentially of chromium trichloride and monosodium glutamate and a method for reducing the ... | 12/26/2000 |
| 6156819 | Use of low- and high-molecular-weight polymers in well treatments An aqueous polymer composition containing water and hydrophilic polymers and a method for treating subterranean formations with the composition to reduce formation permeability. The hydrophilic polymers are a mixture of high-molecular-weight polymers havi... | 12/05/2000 |
| 6156234 | Process for supplying a gaseous mixture to an autothermal reactor An improved process for the compression and heating of air or oxygen-enriched air for charging to an autothermal reactor by using a single high compression ratio compressor to produce a high-pressure, high-temperature air or oxygen-enriched air stream for... | 12/05/2000 |
| 6150822 | Sensor in bit for measuring formation properties while drilling Earth formation evaluation for detection of hydrocarbon fluids is carried out by a microwave frequency range sensor (antenna or wave guide) disposed in the face of a diamond or PDC drill bit configured to minimize invasion of drilling fluid into the forma... | 11/21/2000 |
| 6148911 | Method of treating subterranean gas hydrate formations A gas hydrate formation is treated by horizontally fracturing the formation, placing electrically conductive proppant particles in the fracture, and passing an electric current through the proppant particles in the fracture to generate sufficient heat to ... | 11/21/2000 |
| 6143137 | Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly A rotary drum cooler for cooling particulate material (e.g. coke particles) having at least one cooling pocket which, in turn, includes a flexible vent pipe assembly which can slide in relation to the shell of the cooler. By making the vent pipe slidable,... | 11/07/2000 |
| 6142229 | Method and system for producing fluids from low permeability formations A method and system for producing hydrocarbons from a low permeability formation through a well wherein the formation is first fractured with steam. The pressure of the produced fluids is measured at timed intervals and signals representative of these mea... | 11/07/2000 |
| 6133204 | Use of oil-based gel-breaker/inhibitor compounds with polymer gels in well treatments A gel-breaking/gel-inhibiting composition containing at least one carboxylic acid or salt thereof is dispersed in a hydrophobic carrier fluid to break down a cross-linked polymer gel or inhibit the gelation of a polymer gel used in plugging in permeable s... | 10/17/2000 |
| 6132560 | Rotary drum cooler having adjustable lifters A rotary drum cooler having a shell for cooling particulate material (e.g. coke particles) wherein the volumetric capacity of the lifters within the shell which lift the material from the bottom of the shell to the exit thereof can be adjusted to thereby ... | 10/17/2000 |
| 6130199 | Surfactant composition for cleaning wellbore and oil field surfaces using the surfactant composition A method and composition for removing deposits of heavy hydrocarbonaceous materials and finely divided inorganic particulate matter from wellbore and flowline surfaces using a composition containing an alkyl polyglycoside, an ethoxylated alcohol, a causti... | 10/10/2000 |
| 6116340 | Downhole build-up pressure test using coiled tubing A method and an apparatus for carrying out a downhole shut-in, pressure build-up test of a formation by lowering a string of coiled tubing having a pressure sensor and a packer thereon through the production tubing of the well. The packer is set to isolat... | 09/12/2000 |
