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| Number | Title | Issue Date |
| 7514391 | Method and composition for removing filter cake from a horizontal wellbore using a stable acid foam A composition and method for removing a filter cake from a horizontal wellbore in a subterranean formation using a composition containing a inorganic or organic acidic material, a cationic fluorocarbon surfactant, an alkyl alcohol, water optionally containing ammoni... | 04/07/2009 |
| 7514390 | Method for removing filter cake from a horizontal wellbore using acid foam A composition and method for removing a filter cake from a horizontal wellbore in a subterranean formation using a composition containing a inorganic or organic acidic material, a cationic fluorocarbon surfactant, an alkyl alcohol, water optionally containing ammoni... | 04/07/2009 |
| 7451823 | Well chemical treatment utilizing plunger lift delivery system with chemically improved plunger seal An apparatus incorporating a chemical seal and method for removing fluids from a well is disclosed. The chemical seal is created by a foaming agent which, when in the presence of gas and fluids present in the well, and when agitated by the apparatus, creates foam be... | 11/18/2008 |
| 7405997 | Method of accounting for wavelet stretch in seismic data A computer-implemented method of accounting for angle-dependent wavelet stretch in seismic data based on a novel relationship between wavelet stretch and the cosine of a reflection angle of an acoustic ray. Conventional seismic data having at least one wavelet, such... | 07/29/2008 |
| 7398823 | Selective electromagnetic production tool A method for resistively heating a subterranean region to lower the viscosity of heavy oil by using production tubing coupled to at least two electrodes modified for three-phase flow and an electrically insulating body. ... | 07/15/2008 |
| 7387015 | Material strength indexing system Apparatus and methods for estimating a physical property of a specimen, particularly the specimen strength, are provided. More specifically, a roller indenter comprising an indenting wheel and a force indicator is used to create an elongated trough in a specimen. Th... | 06/17/2008 |
| 7295490 | System and method of phase encoding for high fidelity vibratory seismic data In accordance with the present invention, there is provided a method of determining whether a particular high fidelity vibratory seismic survey phase encoding is likely to be a good one based on an analysis of the eigenvalue structure (i.e., eigenvalues, eigenvalue ... | 11/13/2007 |
| 7280952 | Well planning using seismic coherence A system for predicting hydrocarbon production from a subterranean region of interest using reflection seismic data. The system sets a drainage area around reference traces and defines drainage pathways extending outwardly from the reference trace towards the perime... | 10/09/2007 |
| 7275605 | Rotatable drill shoe A rotatable drilling shoe attachable to a section of casing that allows for drilling and casing of a well bore in a single trip. The drilling shoe includes a fixed section and a rotatable section that has a drillable bit attached thereto. The drilling shoe further i... | 10/02/2007 |
| 7273893 | Process for converting carbon dioxide to oxygenates A catalyst and process for converting carbon dioxide into oxygenates. The catalyst comprises copper, zinc, aluminum, gallium, and a solid acid. ... | 09/25/2007 |
| 7222673 | Production of free gas by gas hydrate conversion A method for releasing gas from a gas hydrate without melting the gas hydrate by substituting the gas with a releasing agent that forms a more stable hydrate structure than the gas. ... | 05/29/2007 |
| 7204661 | Pipeline system utilizing cold bends An expansion loop for an above-ground pipeline that utilizes cold bent pipe sections having a bend angle of less than 90 degrees and a bend rate (in degrees per foot) of relatively low severity. ... | 04/17/2007 |
| 7096712 | Material testing system for turbines The wear resistance of impellers used in multi-stage turbine pumps is tested by using a multi-stage turbine pump having impellers with different physical properties to pump a fluid containing small amounts of an abrasive material. After the fluid has been pumped for... | 08/29/2006 |
| 6954403 | Concurrent phase angle graphic analysis Waveform data, such as reflection seismic data, is filtered by concurrently analyzing various phase angles of the data. The various phase angles of the data are compared to phase rotated background trends and the phase angle producing the maximum deviation from the ... | 10/11/2005 |
| 6838006 | Oil field separation facility control system utilizing total organic carbon analyzer An oil field separation facility utilizing a total organic carbon analyzer to help maintain consistently acceptable levels of oil and water separation. The facility separates a produced oil and water mixture into an oil-rich stream and a water-rich stream. The total... | 01/04/2005 |
| 6829537 | Contour-based attribute seismic mapping A system for filtering elevation-sensitive data. The system generates coincident contour and attribute maps of a physical structure. A filter band that is limited to a certain range of contour values is used to filter the attribute values that are output to a CBA at... | 12/07/2004 |
| 6804609 | Property prediction using residual stepwise regression A method for predicting reservoir properties at an unexplored subterranean location based on known seismic attributes at the unexplored subterranean location, as well as known reservoir properties and seismic attributes at a plurality of explored subterranean locati... | 10/12/2004 |
| 6687659 | Method and apparatus for absorbing boundary conditions in numerical finite-difference acoustic applications A hybrid approach is disclosed for implementing highly efficient absorbing boundary conditions in three dimensional (3D) finite difference (FD) acoustic applications such as post-stack and pre-stack seismic migration, and forward modeling. The "Perfectly ... | 02/03/2004 |
| 6665117 | Method and apparatus for interactive curved surface borehole interpretation and visualization An enlarged computer graphic image of borehole data is displayed on a concave three-dimensional surface, preferably a semi-cylindrical shape. Thus providing an enlarged image of a borehole surface where the data is spatially correct in three-dimensions, a... | 12/16/2003 |
| 6638892 | Syngas conversion and catalyst system employed therefor A process for the conversion of syngas by contact of syngas under conversion conditions with catalyst having as components zinc oxide, copper oxide, aluminum oxide, Y zeolite and clay in which (A) in a one step process for conversion of syngas to dimethyl... | 10/28/2003 |
| 6574566 | Automated feature identification in data displays A method for recognizing and comparing features of attribute data expressed in a 3D data survey involves: extracting, mapping, color coding and displaying 3D data for at least one attribute. Preferably, the data is based on tomographic paths. The tomograp... | 06/03/2003 |
| 6519532 | Method and apparatus for 3D depth migration A method for imaging seismic data and eliminating noise and error in the resulting image is disclosed. In this method seismic data that has undergone downward extrapolation is corrected by applying Li-correction at regular depth intervals. The Li-correcti... | 02/11/2003 |
| 6430510 | Application of hybrid gathers for rapid determination of seismic acquisition parameters In accordance with the present invention, a method is disclosed herein which is primarily designed for use in improving the seismic data collection process through the use of hybrid gathers. The instant invention is suitable for application either in the ... | 08/06/2002 |
| 6424464 | Method and apparatus for interactive curved surface seismic interpretation and visualization An enlarged computer graphic image of seismic data is displayed on a concave three-dimensional surface having a shape corresponding to the shape of selected data extracted from a three-dimensional seismic volume. Thus providing an enlarged image of a seis... | 07/23/2002 |
| 6311791 | Hydraulic underreamer and sections for use therein A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minimize wear on its se... | 11/06/2001 |
| 6241030 | Hydraulic underreamer and sections for use therein A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minimize wear on its se... | 06/05/2001 |
| 6237702 | Hydraulic underreamer and sections for use thereof A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minimize wear on its se... | 05/29/2001 |
| 6223839 | Hydraulic underreamer and sections for use therein A hydraulic underreamer for enlarging a wellbore includes improved packer, cutting, jet pump, and mill sections. Each of the sections and their associated advantages are described herein in detail. The packer section is designed to minimize wear on its se... | 05/01/2001 |
| 6124228 | Mazzite supported catalyst A catalyst, method for preparing the catalyst, and method for using the catalyst having improved conversion and/or selectivity in the dehydrogenation of hydrocarbons. The catalyst being prepared by modifying and impregnating a mazzite zeolite. Modificatio... | 09/26/2000 |
| 6113774 | Antifoulant control process A process is provided by the invention which comprises: (a) providing a tubular reactor having an inlet and an outlet, a furnace for heating the reactor, and a cooler having an inlet in communication with the reactor outlet and also having an outlet; (b) ... | 09/05/2000 |
| 6106789 | Alkylation reactor with internal acid cooling zones The invention provides an improved alkylation process and reactor apparatus. The invention utilizes a vessel containing a riser-reactor conduit, an acid settler and an acid cooler. Hydrocarbons are introduced beneath said riser-reactor conduit, mixed with... | 08/22/2000 |
| 6084145 | Dehydrogenation catalyst and dehydrogenation process using said catalyst A dehydrogenation catalyst is produced by a process comprising the steps of: mixing an L-zeolite, chromium(VI) oxide, a binder, and an acid to form a mixture; and calcining the mixture at a temperature of about 200-800° C. A paraffin having 2-7 carbon at... | 07/04/2000 |
| 6066770 | Selectivated zeolitic hydrocarbon conversion catalyst A catalyst, method for preparing the catalyst, and method for using the catalyst having improved para-selectivity in the conversion of alkyl-substituted benzene to para-dialkyl-substituted benzene. The catalyst being prepared by calcining a starting zeoli... | 05/23/2000 |
| 6045661 | Process and apparatus for recovering diluent, monomer, and comonomer from a polymerization reactor effluent A process and apparatus are provided for recovering diluent, unreacted monomer, and unreacted comonomer from a polymerization reactor effluent. The comonomer has a boiling point higher than the boiling point of the monomer and the diluent has a boiling po... | 04/04/2000 |
| 6042790 | Apparatus for maintaining unreacted monomer concentration in a polymerization reactor In a polymerization process utilizing a high pressure flash to separate polymer from unreacted monomer contained in the effluent stream from the reactor, the concentration of unreacted monomer in the reaction effluent is determined by withdrawing from the... | 03/28/2000 |
| 6021817 | Multi-layer plastic helical pipe and method for the production thereof A method of producing large-diameter helical pipes for plastic synthetic resins wherein the pipe has an outer layer comprised of a first plastic resin and an inner layer comprised of a second plastic resin. In a particularly preferred embodiment, a helica... | 02/08/2000 |
| 5993966 | Cord impregnated with rodent repellent A cord is impregnated with a rodent repellent such as an N,N-dialkyl-sulfenyl dithiocarbamate. The impregnated cord can be positioned along an elongated member, such as a buried electric cable, to protect the elongated member from damage by rodents. Prefe... | 11/30/1999 |
| 5992507 | Geothermal community loop field A geothermal community loop field which serves as a shared means of heat exchange for a plurality of thermal loads. Heat is exchanged between the ground and a circulating heat exchange fluid in at least one subterranean heat exchanger. Heat is exchanged b... | 11/30/1999 |
| 5988617 | Blade-changing work table and blade cover A work table and blade cover are provided to assist in changing the blades on a pelletizer blade holder. The work table employs a tabletop and a shaft integrally connected to the tabletop. The shaft is threaded along at least a portion of its length and i... | 11/23/1999 |
| 5902460 | Multi-stage fractional distillation process and apparatus A distillation column suitable for the separation of a three component feed mixture is provided wherein the fractional distillation column utilizes a vertical partition and a baffle to prevent feed mixture from taking a direct flow path from the feed inle... | 05/11/1999 |
