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| Number | Title | Issue Date |
| 7669468 | Measuring mud flow velocity using pulsed neutrons The invention relates to methods and apparatus for determining downhole mud flow rates and other downhole parameters. A method for determining a downhole parameter includes operating a pulsed neutron generator (6), pulsing the pulsed neutron generator (6 | 03/02/2010 |
| 7439495 | Nuclear imaging probe A nuclear imaging probe 1 for measuring the density of a subsurface formation GF in a limited zone surrounding a well-bore hole WBH. The probe comprises: a pad 2 having a face arranged so as to be positioned in contact with a well-bore wall WBW, at lea... | 10/21/2008 |
| 7369979 | Method for characterizing and forecasting performance of wells in multilayer reservoirs having commingled production A method for forecasting performance for and characterizing the properties of a multilayer low permeability gas reservoir. The method includes a coupled well/reservoir predictive model that accounts for pressure drop between layers, allowing accurate, rigorous, and ... | 05/06/2008 |
| 7359845 | Method and system for predictive stratigraphy images Methods and systems are provided for displaying and forecasting the lithology and wellbore conditions to be encountered while conducting drill string operations in a wellbore. A method and system is described for predicting and modeling lithology while operating a d... | 04/15/2008 |
| 7334465 | Integrated logging tool for borehole An apparatus for measuring characteristics of earth formations surrounding a borehole, comprises a resistivity measurement device having a multiplicity of antennae spaced between each other in a longitudinal direction of the apparatus. A neutron measurement device o... | 02/26/2008 |
| 7317989 | Method and apparatus for chemometric estimations of fluid density, viscosity, dielectric constant, and resistivity from mechanical resonator data The present invention provides a chemometric equation to estimate fluid density, viscosity, dielectric constant and resistivity for a formation fluid sample downhole. The chemometric estimates can be used directly as estimated values for fluid density, viscosity, di... | 01/08/2008 |
| 7285772 | Logging tool with a parasitic radiation shield and method of logging with such a tool It is described a logging tool 20 for underground formations surrounding a borehole 14, comprising an elongated body 21 along a major axis; a collar 22 disposed peripherally around said body 21 having a collar wall defined by an in... | 10/23/2007 |
| 7279889 | System and method for calibration of well logging tools By breaking the calibration into two parts—one calibration offset being associated with a first portion, and the other calibration offset being associated with a second portion, it is possible to combine the various calibration offsets for a particular first porti... | 10/09/2007 |
| 7231819 | Chemical sensor for wellbore applications There is described an analyzing device having two separation units to separate molecular species to detect molecular species in wellbore fluids with both separation units operating under forced flow conditions to provide for an active separation of subterranean well... | 06/19/2007 |
| 7210343 | Method and apparatus for obtaining a micro sample downhole The present invention provides a downhole sample tank and a plurality of micro sample chambers. The micro sample chambers can have at least one window for introduction of visible, near-infrared (NIR), mid-infrared (MIR) and other electromagnetic energy into the tank... | 05/01/2007 |
| 7204308 | Borehole marking devices and methods To reduce the surveying error in a wellbore, the creation of several reference points within a borehole is carried out by physically placing borehole markers in the borehole casing, the borehole wall or in the formation itself, and providing an accurate reference of... | 04/17/2007 |
| 7206376 | Fluid density measurement A wellbore tool for measuring the density of a fluid flowing in a wellbore by a photon attenuation technique includes a tube defining a flow path for the fluid, a photon source at one end of the tube, and a photon detector arranged to receive photons which have pass... | 04/17/2007 |
| 7168310 | Accuracy of shaly sand formation evaluation A novel process and methodology in deterministic formation evaluation is provided. The formation evaluation results can accurately quantify formation attributes, such as clay-volume, clay-bound-water, effective-porosity and water saturation in shaly sands. Total-por... | 01/30/2007 |
| 7150188 | Non-invasive measurement of fluid-pressure diffusivity using electro-osmosis An apparatus for determining fluid-pressure diffusivity in a borehole (12) in a formation (10) includes an electrode (16) and a strain measuring device (18),(20) (or a particle velocity measuring device (18),(20) or a... | 12/19/2006 |
| 7139350 | Method and apparatus for measuring radiation in a borehole Apparatus and methods for measuring radiation in a borehole environment using a YAlO3:Ce (YAP) scintillation crystal. Borehole instruments are disclosed which employ a gamma ray detector comprising a YAP scintillator coupled to a light sensing means such ... | 11/21/2006 |
| 7073582 | Method and apparatus for positioning a downhole tool A tool positioning assembly for positioning downhole tools at desired locations within a wellbore. The current invention further provides methods for using a tool positioning assembly. The tool positioning assembly and methods for using the same reduce the number of... | 07/11/2006 |
| 7073378 | Integrated logging tool for borehole An apparatus for measuring characteristics of earth formations surrounding a borehole, comprises a resistivity measurement device having a multiplicity of antennae spaced between each other in a longitudinal direction of the apparatus. A neutron measurement device o... | 07/11/2006 |
| 7059404 | Variable intensity memory gravel pack imaging apparatus and method An apparatus and method are provided for varying an operating parameter for a nuclear gamma ray tool for evaluating the integrity of gravel packing. The gamma ray outpat intensity and area of investigation are altered by changing a source housing geometry and the ma... | 06/13/2006 |
| 7062420 | Production optimization methodology for multilayer commingled reservoirs using commingled reservoir production performance data and production logging information An overall petroleum reservoir production optimization methodology permits the identification and remediation of unstimulated, under-stimulated, or simply poorly performing reservoir completed intervals in a multilayer commingled reservoir that can be recompleted us... | 06/13/2006 |
| 6977499 | Formation-based interpretation of NMR data for carbonate reservoirs An apparatus and method for determining a parameter of interest of a formation composed of carbonate rock. A nuclear magnetic resonance (NMR) sensor assembly produces a pulsed RF field designed for obtaining measurements indicative of the parameter of interest of th... | 12/20/2005 |
| 6959246 | Carbonate permeability A modification to the Coates-Timur relationship to produce a more coherent relationship applicable to carbonate formations is disclosed. In this method, permeability may be determined using porosity and the ratio of bound fluid volume to (1—bound fluid volume). Th... | 10/25/2005 |
| 6938470 | Method and apparatus for downhole fluid characterization using flexural mechanical resonators The present invention provides a downhole method and apparatus using a flexural mechanical resonator, for example, a tuning fork to provide real-time direct measurements and estimates of the viscosity, density and dielectric constant of formation fluid or filtrate i... | 09/06/2005 |
| 6903330 | Multi-point subsurface measurement calibration Techniques for calibrating well-logging sensors comprising emitting a first signal into a first calibration substance disposed proximate to the sensor, measuring a first sensor response from the first signal, emitting a second signal into a second calibration substa... | 06/07/2005 |
| 6843316 | Method for improving well quality A method of improving the quality of liquid coming from a well that has a pump and pipe assembly. The method includes identifying a region of the well that is low in contamination and a region of the well that is high in contamination, and modifying the pump and pip... | 01/18/2005 |
| 6571619 | Real time petrophysical evaluation system A subsurface formation petrophysical evaluation method including: determining formation porosity and permeability using a quantitative indication of formation composition; estimating water-filled formation resistivity using the formation porosity; associa... | 06/03/2003 |
| 6552334 | Wellbore caliper measurement method using measurements from a gamma-gamma density Methods are disclosed for determining the standoff of a well logging instrument from the wall of a wellbore and the shape of the wellbore itself. The methods include measuring a compensated gamma-gamma formation density at a rotary orientation proximate a... | 04/22/2003 |
| 6516663 | Downhole electromagnetic logging into place tool Apparatus and method for accurately logging a drill-stem test tool into place as the DST tool is conveyed by drill pipe or tubing to the desired location are provided. One aspect of the invention provides an apparatus for logging into place a drill stem t... | 02/11/2003 |
| 6308561 | Well logging apparatus A well logging device of compact reduced diameter compared to the prior art, such well logging device having both short spaced and long spaced types of gamma ray crystal detectors installed in a measurements skid that comprises a relatively small diameter... | 10/30/2001 |
| 5909772 | Apparatus and method for estimating liquid yield of a gas/condensate reservoir Apparatus and method for determining a liquid yield from a gas/condensate reservoir. The apparatus and method first determines the porosity at each depth of a reservoir, using open hole logging techniques, before the well within the reservoir is used for ... | 06/08/1999 |
| 5892147 | Method for the determination of inflow of oil and/or gas into a well A procedure to determine the inflow of oil and/or gas from an oil and/or gas reservoir under the surface of the Earth into a wellbore in the reservoir. Traceable material with different identifying characteristics, e.g. different radioactive isotopes, is ... | 04/06/1999 |
| 5736636 | Probe for radiologically determining the density of rock in a drilled well A probe for determining the density of the material forming the wall of a wellhole provided with a selectively actuable source of gamma radiation pulses, including a pulse electron accelerator having an anode and cathode in axial alignment with a control ... | 04/07/1998 |
| 5708203 | Neutron logging method for quantitative wellbore fluid analysis A neutron logging tool is used to obtain information about fluids within a wellbore. The well is shut in and a neutron log count rate (Mgas) is obtained in a portion of the wellbore containing primarily gaseous fluid and a neutron log count rat... | 01/13/1998 |
| 5663073 | Earth formation porosity estimation method A method for determined porosity of an earth formation surrounding a borehole without prior knowledge of formation lithology. Neutron logging tools are used to measure thermal neutron porosity, epithermal neutron porosity and formation absorption cross se... | 09/02/1997 |
| 5571962 | Method and apparatus for analyzing drill cuttings A method and apparatus for identifying cuttings from a wellbore is disclosed. The cuttings can be identified by measuring emissions such as alpha, beta, or gamma particles which emanate from the cuttings. A continuous wellbore profile of the alpha or beta... | 11/05/1996 |
| 5493226 | Method and apparatus for measuring properties of core samples including heating and pressurizing the core sample and measuring the dynamic and static capillary pressure of water in the core sample A method and apparatus for obtaining data for simultaneously measuring relative permeability (kr), static capillary pressure, dynamic capillary pressure (Pc), and electrical resistivity (Rt) of a core sample taken from a s... | 02/20/1996 |
| 5461909 | Oxygen activation method for quantitative water flow measurements within and behind well bore casing A method for measuring the linear flow velocity, radial position, direction, and the flow rate of water flowing within and behind a well borehole casing. A logging tool containing a source of essentially monoenergetic 14 MeV neutrons and at least one gamm... | 10/31/1995 |
| 5415030 | Method for evaluating formations and bit conditions A method for evaluating formations and bit conditions is presented. The present invention processes signals indicative of downhole weight on bit (WOB), downhole torque (TOR), rate of penetration (ROP) and bit rotations (RPM), while taking into account bit... | 05/16/1995 |
| 5415037 | Method and apparatus for monitoring downhole temperatures A method and apparatus for determining the temperature in a wellbore is disclosed. The apparatus is lowered into a wellbore to a desired depth and logged over a selected interval. At least one first heat flux and temperature sensor contacts the wellbore w... | 05/16/1995 |
| 5404752 | Method for measuring the velocity of water flow through nested conduits This disclosure provides a method for measuring the velocities of water volumes flowing co-directionally in separate conduits nested such as in injection or production well-bores. The method allows an oxygen activation measurement of the velocity of the w... | 04/11/1995 |
| 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 |
