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| Number | Title | Issue Date |
| 6140637 | Method and apparatus for fluorescence logging A method of locating in situ hydrocarbons in underground formations comprises illuminating the borehole wall with light such as visible, infrared or ultraviolet light or combinations of these, from a source in a tool such as a wireline logging tool or an ... | 10/31/2000 |
| 6018496 | Method and apparatus for hydraulic isolation determination A method and apparatus for determining the hydraulic isolation of layers in an earth formation. The characteristics of various interfaces between the materials in the borehole are evaluated. An acoustic investigation is performed by directing an acoustic ... | 01/25/2000 |
| 5912459 | Method and apparatus for fluorescence logging A method of locating in situ hydrocarbons in underground formations comprises illuminating the borehole wall with light such as visible, infrared or ultraviolet light or combinations of these, from a source in a tool such as a wireline logging tool or an ... | 06/15/1999 |
| 5660627 | Method of growing lutetium oxyorthosilicate crystals A method for producing lutetium oxyorthosilicate crystals includes maintaining the interface between a crystal and the melt from which it is pulled substantially flat as the crystal is grown. In a Czochralski growth method, the rate of rotation of the cry... | 08/26/1997 |
| 5619475 | Method of predicting mechanical failure in formation utilizing stress derivatives which measure formation nonlinearity A method for determining whether a formation is subject to incipient failure are disclosed. The method comprises determining in situ a nonlinear parameter of a formation, and determining whether the nonlinear parameter and/or a derivative of that nonlinea... | 04/08/1997 |
| 5596142 | Well logging apparatus comprising a measuring pad and a combinaton device including such apparatus A well logging apparatus adapted to be moved inside a borehole includes an elongate body, a measuring pad adapted to contact the wall of the borehole, a support device for the pad mounted pivotally on one side of the body, and a counter arm which causes t... | 01/21/1997 |
| 5557201 | Pulsed nuclear magnetism tool for formation evaluation while drilling The instruments of a pulsed nuclear magnetic resonance (NMR) device are included in a drill collar for evaluating earth formations. The resulting tool makes NMR measurements while the formation is being drilled.... | 09/17/1996 |
| 5552786 | Method and apparatus for logging underground formations using radar A method of logging an underground formation from within a borehole includes the steps of emitting an electromagnetic signal from a first location in a borehole, determining a time at which the signal is emitted, detecting a direct component of the signal... | 09/03/1996 |
| 5543617 | Method of measuring flow velocities using tracer techniques A method of measuring flow velocities in flowing fluids includes injecting into the flow a non-radioactive tracer having a neutron capture cross section higher than that of the flowing fluids, for example a gadolinium compound, and measuring the neutron c... | 08/06/1996 |
| 5528556 | Combination well logging device The invention concern a combination well logging device adapted to be moved inside a borehole to measure the properties of geological formations through which the borehole passes. The device according to the invention comprises a series of elongate loggin... | 06/18/1996 |
| 5528495 | Cadmium zinc telluride borehole detector A gamma ray or x-ray detector for borehole use includes a cadmium zinc telluride crystal having the general formula CD1-x Znx Te, where x represents the zinc fraction of the material and preferably is within the range of 0.05ࣘxࣘ0... | 06/18/1996 |
| 5521882 | Measurement of formation characteristics using acoustic borehole tool having sources of different frequencies Apparatus and methods for determining an indication of a nonlinear property of a formation traversed by a borehole are provided. An acoustic tool is used in a borehole to generate first and second signals of different frequencies. As a result of nonlinear... | 05/28/1996 |
| 5517854 | Methods and apparatus for borehole measurement of formation stress A modular sonde may be configured in various ways for measurements in open or cased boreholes. The sonde is conveyed on an electric wireline with or without a coiled tubing for conveying hydraulic energy from the surface. Modules common to the configurati... | 05/21/1996 |
| 5515259 | Inductively charged coaxial capacitor accelerator A high voltage DC source for a particle accelerator is an inductively charged, coaxial nest of capacitors. The nest of capacitors comprises coaxial tubes of insulation, one inside the next, and an inductive coil. The inductive coil is wound in several lay... | 05/07/1996 |
| 5486761 | Nuclear magnetic resonance measuring apparatus The disclosure invention is directed to a nuclear magnetic resonance measurement apparatus that can be utilized in a logging device which operates generally centrally in a borehole, and has a generally circumferential region of investigation, but which pe... | 01/23/1996 |
| 5485743 | Microwave device and method for measuring multiphase flows A method for measuring multiphase flows in a conduit using series of microwave antennae arranged around the circumference of the conduit so as to transmit microwave energy into, or detect propagated microwave energy in the conduit, the method including th... | 01/23/1996 |
| 5475650 | Measurement of nonlinear properties of formation using sonic borehole tool while changing pressure in borehole A method of investigating a formation traversed by a borehole includes, measuring at a plurality of different static borehole pressures the acoustic Stoneley and/or flexural wave velocities of waves propagating through the borehole and formation, and gene... | 12/12/1995 |
| 5463320 | Apparatus and method for determining the resitivity of underground formations surrounding a borehole A logging tool for use in determining the resistivity of an underground formation surrounding a borehole comprises a mandrel with two transmitters spaced apart thereon, each serving to establish a current in the mandrel and in the underground formation. A... | 10/31/1995 |
| 5434507 | Method and apparatus for electromagnetic logging with two dimensional antenna array A two-dimensional array of slot antennas which can provide two-dimensional quantitative dielectric and conductivity images of formations in the region surrounding an earth borehole. The antennas are mounted in a wall-engaging member of a logging device th... | 07/18/1995 |
| 5426368 | Logging method and apparatus for investigating geometrical characteristics of a borehole and for investigating formation resistivity A logging method and apparatus for investigating the geometrical characteristics of a borehole comprises an array of circumferentially spaced apart azimuthal current electrodes (Aazi) disposed on a sonde (21), and an annular current electrode (... | 06/20/1995 |
| 5412990 | Method for measuring cement thickening times A method and apparatus for determining the setting time of a cement slurry. An acoustic shear wave signal is generated and introduced at a first location in the slurry. The signal is monitored at a second location for direct transmission of the shear wave... | 05/09/1995 |
| 5406206 | Method of evaluating a geological formation using a logging tool including slot antenna having two nonparallel elements A slot antenna has a square aperture and two current probes at angles to each other in the aperture. The two current probes are excited simultaneously or separately with different signals. By adjusting the amplitude or phase of the signals in the current ... | 04/11/1995 |
| 5399971 | Method and apparatus for evaluating formation resistivity using focused annular and azimuthal electrodes The apparatus includes an array of azimuthal current electrodes (Aazi) that are circumferentially spaced apart from one another on a body together with two annular guard electrodes (A2) disposed on opposite sides of the array of azimuthal curre... | 03/21/1995 |
| 5396175 | Method and apparatus for evaluating formation resistivity using focused annular and azimuthal electrodes The apparatus includes an annular current electrode (Ao) mounted on a body and guard electrodes (A2, A'2) disposed on the body above and below the annular current electrode. A first measurement current (Io) is emitted by the central current electrode (Ao)... | 03/07/1995 |
| 5389877 | Nuclear magnetic resonance pulse sequences for determining bound fluid volume An NMR pulse sequence for use in a borehole logging tool includes a series of CPMG pulses according to: Tr -90°&#b1;x -(tcp -180°y -tcp -echoj) where j is the index of CPMG echoes gathered, T | 02/14/1995 |
| 5390115 | Compensated gamma-gamma density sonde using three detectors A gamma-gamma sonde for use in determining the bulk density of an earth formation adjacent a borehole comprises a source of gamma radiation and three attenuation-type gamma ray detectors DN, DI and DF spaced apart from the source, respectively, at success... | 02/14/1995 |
| 5376884 | Nuclear magnetic resonance measuring apparatus The disclosure invention is directed to a nuclear magnetic resonance measurement apparatus that can be utilized in a logging device which operates generally centrally in a borehole, and has a generally circumferential region of investigation, but which pe... | 12/27/1994 |
| 5363041 | Determining bound and unbound fluid volumes using nuclear magnetic resonance pulse sequences A borehole logging tool comprises a Nuclear Magnetic Resonance (NMR) tool and is pulsed according to a selected sequence. An interpretation is performed which involves a singular value decomposition and compression of data obtained by the tool. The compre... | 11/08/1994 |
| 5361206 | Method of analyzing a two-phase flow in a hydrocarbon well A method of analyzing the flow in an inclined well, which flow comprises both oil and water is described. For a depth at which at least one flow parameter measurement is available, and given the inclination and the diameter of the well at that depth, the ... | 11/01/1994 |
| 5350925 | Methods for determining values for earth formation properties Methods are provided for processing spectral data detected by a gamma ray detector of a borehole tool in order to obtain quantitative determinations of formation and/or borehole properties. According to one invention aspect, spectral data are compressed u... | 09/27/1994 |
| 5345179 | Logging earth formations with electromagnetic energy to determine conductivity and permittivity A form of the disclosure is directed to determining properties of formations surrounding an earth borehole having a standoff layer. A method is disclosed for determining the conductivity and permittivity of the standoff layer and the conductivity and perm... | 09/06/1994 |
| 5343153 | Well logging method and apparatus using passive azimuthal electrodes The invention relates to a logging method and apparatus using passive azimuthal electrodes. The apparatus includes an array of azimuthal electrodes (M'azi) that are circumferentially spaced apart from one another on a body together with two ann... | 08/30/1994 |
| 5335542 | Integrated permeability measurement and resistivity imaging tool A borehole tool having adjacently located fluid injection/withdrawal apparatus and an electromagnetic measurement apparatus is provided. The electromagnetic measurement apparatus can be an imaging apparatus for helping set the tool in desired locations fo... | 08/09/1994 |
| 5334833 | Sensitivity function technique for modeling nuclear tools A new technique, called the sensitivity function technique, has been developed for modeling nuclear density tools. Specifically, sensitivity functions relate a change in formation properties to a change in detector response and are based on the first orde... | 08/02/1994 |
| 5331156 | Method of analyzing oil and water fractions in a flow stream Methods for quantifying the oil and water fractions of a fluid stream. A first method broadly includes making optical density (OD) measurements of the fluid stream by detecting photons of a first predetermined energy where the oil and water absorption cha... | 07/19/1994 |
| 5331604 | Methods and apparatus for discrete-frequency tube-wave logging of boreholes The present invention offers methods and apparatus for low-frequency sonic borehole logging with tube waves using discrete frequency measurements. A source transducer emits sonic energy at a location in a borehole of at least one discrete frequency which ... | 07/19/1994 |
| 5325284 | Electrostatic particle accelerator having linear axial and radial fields A particle accelerator comprises a Cockcroft-Walton voltage multiplier that provides linear axial and radial fields. The Cockcroft-Walton voltage multiplier includes capacitors that are arranged radially relative to one another, such that a linear voltage... | 06/28/1994 |
| 5319314 | Electron orbit control in a betatron A betatron, adapted, e.g., for use as a high-energy electromagnetic radiation source in a borehole well logging tool, includes modulator circuitry for actively controlling the electron beam radius during acceleration and for extracting the electron beam a... | 06/07/1994 |
| 5309404 | Receiver apparatus for use in logging while drilling An apparatus for reducing or eliminating the effects of a quadrupole component of an acoustic signal received from a transversely mounted acoustic source in a drill collar of a logging while drilling tool. The apparatus includes a drill collar for support... | 05/03/1994 |
| 5282133 | Nuclear logging methods for determining values of earth formation properties via use of calibration database and a spatial deconvolution inversion matrix Methods are provided for processing spectral data detected by a gamma ray detector of a borehole tool in order to obtain quantitative determinations of formation and/or borehole properties. According to one invention aspect, spectral data are compressed u... | 01/25/1994 |
