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| Number | Title | Issue Date |
| 6987386 | Determining resistivity of a geological formation using circuitry located within a borehole casing Geological formation resistivity is determined. Circuitry is located within the borehole casing that is adjacent to the geological formation. The circuitry can measure one or more voltages across two or more voltage measurement electrodes associated with the borehol... | 01/17/2006 |
| 6577144 | Electrical voltages and resistances measured to inspect metallic cased wells and pipelines A cased well in the earth is electrically energized with A.C. current. Voltages are measured from three voltage measurement electrodes in electrical contact with the interior of the casing while the casing is electrically energized. In a measurement mode,... | 06/10/2003 |
| 6510796 | Shaped charge for large diameter perforations A shaped charge for generating a large hole in material such as well casing downhole in a wellbore. A shaped charge liner is oriented about a longitudinal axis, and a disk is positioned at the liner apex. When an explosive material is initiated the liner ... | 01/28/2003 |
| 6305289 | Shaped charge for large diameter perforations A shaped charge for generating a large hole in material such as well casing downhole in a wellbore. A shaped charge liner is oriented about a longitudinal axis, and a disk is positioned at the liner apex. When an explosive material is initiated the liner ... | 10/23/2001 |
| 6249122 | Electrical voltages and resistances measured to inspect metallic cased wells and pipelines A cased well in the earth is electrically energized with A.C. current. Voltages are measured from three voltage measurement electrodes in electrical contact with the interior of the casing while the casing is electrically energized. In a measurement mode,... | 06/19/2001 |
| 6246240 | Determining resistivity of a formation adjacent to a borehole having casing with an apparatus having all current conducting electrodes within the cased well Methods of operation of different types of multiple electrode apparatus vertically disposed in a cased well to measure information useful to determine the resistivity of adjacent geological formations from within the cased well are described. The multiple... | 06/12/2001 |
| 6230840 | Marine vibrator A marine vibrator has a hollow body formed of one shell or of two opposed shells defining an inner space therein with vibrator apparatus within the hollow body. At least one shell has a curved shape, and the shell can have a streamlined shape with relativ... | 05/15/2001 |
| 6218662 | Downhole carbon dioxide gas analyzer A logging tool system for analyzing the carbon dioxide concentration in a fluid sample downhole in a borehole. A chamber is filled with the fluid sample and is closed to isolate the fluid sample from the borehole. The interior chamber volume is expanded t... | 04/17/2001 |
| 6196319 | Hydraulic sand removal tool An apparatus and method for removing sand and other debris from a wellbore. The apparatus is particularly suited for wireline operation, and requires minimal surface equipment. A housing is lowered into the wellbore until the housing is proximate to the s... | 03/06/2001 |
| 6188962 | Continuous data seismic system A system for seismic data acquisition has been invented having, in certain aspects, one or multiple distributed data acquisition subsystems that are independent of energy source controller and/or of navigation system operation. Thus the distributed acquis... | 02/13/2001 |
| 6176344 | Method and system for determining the azimuth position and distance of a reflecting subsurface formation A method and system for determining the azimuth position and distance of a reflector or subterranean reflecting surface of a formation bed outside a borehole. A monopole transmitter may be used with a monopole/dipole receiver pair, or a monopole transmitt... | 01/23/2001 |
| 6175536 | Cross-well seismic mapping method for determining non-linear properties of earth formations between wellbores A method for determining a degree of acoustic non-linearity of an earth formation from seismic signals transmitted into the formation from within one wellbore and received from the formation in another wellbore. The seismic signals include two selected di... | 01/16/2001 |
| 6163153 | Nuclear magnetic resonance pulse sequence for optimizing instrument electrical power usage A method for acquiring nuclear magnetic resonance measurements of a material. The method includes inducing a static magnetic field in the material, and inducing a first radio frequency magnetic field in the material to reorient nuclear magnetic spins in t... | 12/19/2000 |
| 6157195 | Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present Methods to quantitatively determine the separate amounts of oil and gas in a geological formation adjacent to a cased well using measurements of formation resistivity. The steps include obtaining resistivity measurements from within a cased well of a give... | 12/05/2000 |
| 6154420 | Seismic streamer trim section A system for selectively tuning the buoyancy of a marine seismic streamer or underwater cable. Trimming weights are positioned along the streamer cable and can be integrated within a solid buoyancy member or can be located within an outer streamer sheath.... | 11/28/2000 |
| 6148952 | Hydraulic slotted cylinder source An apparatus for generating acoustic source energy in a liquid medium. A slotted cylinder has an interior volume filled with a fluid. An actuator selectively pressurizes the fluid to expand the slotted cylinder. Movement of the slotted cylinder due to exp... | 11/21/2000 |
| 6124590 | Method for determining thermal neutron capture cross-section of earth formations using measurements from multiple capture gamma ray detectors A method for determining thermal neutron capture cross-section of an earth formation penetrated by a wellbore from counts of capture gamma rays detected at spaced apart locations from a source irradiating the formations with bursts of high energy neutrons... | 09/26/2000 |
| 6121773 | Longitudinal NMR well logging apparatus and method The invention is a nuclear magnetic resonance sensing apparatus comprising a magnet for inducing a static magnetic field in a region containing materials to be analyzed. The static magnetic field is polarized generally along the axis of the apparatus. The... | 09/19/2000 |
| 6118272 | Nuclear magnetic resonance apparatus and method A nuclear magnetic resonance apparatus including a magnet generating a static magnetic field in a first region containing materials to be analyzed. The magnet generates zero static magnetic field in a second region. The magnet has generally homogeneous ma... | 09/12/2000 |
| 6116337 | Articulated downhole electrical isolation joint An articulated connector for providing electrical insulation between downhole well equipment such as logging sondes suspended by a wireline. Articulated joints are connected to the well equipment to provide for the desired movement, and the joints are con... | 09/12/2000 |
| 6111409 | Nuclear magnetic reasonance fluid characterization apparatus and method for using with electric wireline formation testing instruments A method for characterizing a fluid sample withdrawn from an earth formation. The method includes performing nuclear magnetic resonant spin echo measurements on the fluid sample at a nuclear magnetic resonant frequency of carbon-13. Amplitudes of the spin... | 08/29/2000 |
| 6108605 | Low distortion digitally controlled transmitter for use in a well logging tool A system and method for controlling the transmitted signal for use in a well logging tool, using an iterative method (preferably the method of steepest descent) such that the transmitted signal more closely resembles a desired waveform.... | 08/22/2000 |
| 6095258 | Pressure actuated safety switch for oil well perforating A perforating gun assembly for perforating wellbores, comprising a shaped charge carrier assembly, a detonating cord for initiation OF shaped charges in the carrier assembly, an initiator attached to the detonating cord for initiating the cord on applicat... | 08/01/2000 |
| 6084825 | Apparatus and methods for seismic data processing A method of determining an optimum processing sequence by calculation of processing sequence sensitivity and processing sequence error. A reference seismic processing sequence is applied to input raw gathers to obtain reference seismic output data. A seri... | 07/04/2000 |
| 6084408 | Methods for acquisition and processing of nuclear magnetic resonance signals for determining fluid properties in petroleum reservoirs having more than one fluid phase A method for determining intrinsic transverse relaxation time of a first mobile phase in a porous medium using nuclear magnetic resonance measurement sequences. The sequences are measured at first and second wait times. At least two different interecho sp... | 07/04/2000 |
| 6076630 | Acoustic energy system for marine operations A marine seismic source for generating acoustic source energy. A housing has a continuous exterior perimeter which is moveable to displace water. Movement of the housing can be accomplished by providing alternating convex and concave exterior surfaces con... | 06/20/2000 |
| 6069841 | Pressurized lead-in for a seismic streamer cable A seismic lead-in for a seismic streamer cable has been invented which, in certain aspects, has at least one stress member, the at least one stress member having an interior surface, a first sealing member adjacent the interior surface of the at least one... | 05/30/2000 |
| 6069479 | Permanent magnet material composition and structure for eddy current suppression in a nuclear magnetic resonance sensing apparatus A nuclear magnetic resonance well logging apparatus, comprising an antenna for inducing a radio frequency magnetic field in earth formations surrounding the apparatus and for detecting nuclear magnetic resonance signals from the earth formations; and a ma... | 05/30/2000 |
| 6069477 | Method for improving the accuracy of NMR relaxation distribution analysis with two echo trains The total porosity of a subterranean formation is calculated by summing the effective Porosity and the clay bound water (CBW) porosity. With the invention described in this patent, the distortion effects of clay bound water (CBW) porosity on the measureme... | 05/30/2000 |
| 6069845 | Composite marine seismic source A marine seismic source for generating acoustic source energy from electrical power. A slotted housing has an exterior surface engaged with an electrically activated transducer such as a piezoelectric transducer. One or more piezoelectric components can b... | 05/30/2000 |
| 6064063 | Method for determining thermal neutron capture cross-section of earth formations using measurement from multiple capture gamma ray detectors A method for determining the thermal neutron capture cross-section of an earth formation penetrated by a wellbore from counts of capture gamma rays. The capture gamma rays are detected at spaced apart locations after bombarding the formations with high en... | 05/16/2000 |
| 6060886 | Radial sounding electrical well logging instrument An apparatus for determining radial distribution of resistivity of earth formations surrounding a wellbore. The apparatus includes a sonde mandrel having an insulating exterior surface and electrodes disposed on the insulating surface at spaced apart loca... | 05/09/2000 |
| 6060885 | Method and apparatus for determining the resistivity and conductivity of geological formations surrounding a borehole A differential array instrument for determining selected parameters of an earth formation surrounding a borehole, including an instrument mandrel carrying a single source electrode for injecting an electrical current of a predetermined value into the form... | 05/09/2000 |
| 6060662 | Fiber optic well logging cable A well logging cable including an optical fiber and a pressure sealed enclosure surrounding the fiber. The enclosure is adapted to be able to be elongated to the maximum expected axial strain on the logging cable without permanent deformation. In one embo... | 05/09/2000 |
| 6061302 | Gimbal lock system for seismic sensors An apparatus and method for selectively locking the orientation of seismic data sensor capable of detecting data regarding a seismic event. A gimbal orients the sensor into a selected vertical orientation, and a switch operates a clutch to lock the sensor... | 05/09/2000 |
| 6049209 | Axial resolution enhancement method for resistivity well logs which accounts for lateral variations in the resistivity of earth formations penetrated by a wellbore A method for enhancing the axial resolution of conductivity well log measurements of in earth formation zones radially distal from a wellbore. The method includes calculating differential axial resolution information present in measurements of the conduct... | 04/11/2000 |
| 6049205 | Multiple frequency method for nuclear magnetic resonance longitudinal relaxation measurement and pulsing sequence for power use optimization A method for determining nuclear magnetic resonance longitudinal relaxation time of a medium. The method includes magnetically polarizing nuclei in the medium along a static magnetic field, momentarily inverting the magnetic polarization of the nuclei wit... | 04/11/2000 |
| 6044786 | Seismic cable retrieval system An apparatus supported by a vessel for removing a seismic cable and attached buoy from water. A clamp for gripping the cable and attached buoy is connected to a boom. The boom manuevers the clamp into engagement with the floating buoy, lifts the buoy from... | 04/04/2000 |
| 6044038 | Marine seismic cable system A marine seismic cable system for marine surveying comprises an electrical conductor within a tubing for conveying compressed air and electricity between a seismic vessel and equipment such as air guns. The tubing resists elongation caused by water drag f... | 03/28/2000 |
| 6044325 | Conductivity anisotropy estimation method for inversion processing of measurements made by a transverse electromagnetic induction logging instrument A method for generating an improved estimate of horizontal conductivity, dip angle, azimuth and anisotropy parameter of an earth formation penetrated by a wellbore from dual-frequency transverse electromagnetic induction measurements, comprising generatin... | 03/28/2000 |
