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| Number | Title | Issue Date |
| 7966874 | Multi-resolution borehole profiling Harmonics and subharmonics of acoustic measurements made during rotation of a sensor on a downhole are processed to estimate the location of the imager, and size and shape of the borehole. A piecewise elliptical fitting procedure may be used. These estimates may be ... | 06/28/2011 |
| 7743654 | System, method and apparatus for petrophysical and geophysical measurements at the drilling bit Measurement of petrophysical and geophysical data of formations in a wellbore using a long gauge bit having at least one sensor therewith. The at least one sensor may be installed in at least one flute of the long gauge bit and/or in the long gauge portion thereof. ... | 06/29/2010 |
| 7389828 | Apparatus and method for mechanical caliper measurements during drilling and logging-while-drilling operations A caliper tool used on a drilling tubular and having extensible members that remain decoupled with respect to the borehole wall during caliper measurements and while the extensible members are extended to allow movement in and through the borehole. A processor proce... | 06/24/2008 |
| 7361887 | Measurement of formation gas pressure in cased wellbores using pulsed neutron instrumentation A pulsed neutron tool with three or more detectors is used for making measurements inside casing. The measurements may be used to determine gas saturation at a constant gas pressure, pressure at constant gas saturation, or to determine both gas saturation and gas pr... | 04/22/2008 |
| 7331469 | Vibratory separator with automatically adjustable beach A vibratory separator having a basket for supporting screen apparatus for treating material, the basket pivotably mounted on a base, vibratory apparatus connected to the basket for vibrating the basket, the material forming a pool on the screen apparatus, and a beac... | 02/19/2008 |
| 7310580 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 12/18/2007 |
| 7299884 | Seismic measurements while drilling Measurements are made continuously with a seismic while drilling (SWD) system and the measured data are stored in a working memory of a downhole processor along with quality control (QC) measurements. The QC data are analyzed and based on the analysis, portions of t... | 11/27/2007 |
| 7301223 | High temperature electronic devices In at least some embodiments, electronic devices suitable for use at temperatures in excess of 200 C. may comprise an integrated circuit fabricated on a silicon carbide substrate, and a thick passivation layer. In other embodiments, electronic devices suitable for u... | 11/27/2007 |
| 7299132 | Method and system for pre-drill pore pressure prediction A method for pore pressure prediction. The method includes obtaining a stress sensitivity coefficient, obtaining a compressional wave (P-wave) velocity and a shear wave (S-wave) velocity for a pre-drill location and obtaining a first predicted pore pressure. Further... | 11/20/2007 |
| 7284623 | Method of drilling a bore hole A method for drilling a borehole through a production zone underlying an overburden of various earth formations includes drilling the borehole through the overburden with a first drill bit. The first drill bit being selected to optimize at least one drilling perform... | 10/23/2007 |
| 7286959 | Drill bit performance analysis tool A method and system that can be used to automatically calculate and generate performance analysis charts, including a reliability curve is disclosed. The method and system may be used to selectively convert performance records data from a database into graphs and ch... | 10/23/2007 |
| 7282704 | Method for determining formation porosity and gas saturation in a gas reservoir Measurements made with porosity and density logging tools in a gas reservoir may differ due to invasion effects. The effects are particularly large on measurement-while-drilling applications where invasion is minimal. Using a Monte-Carlo method, a relationship is es... | 10/16/2007 |
| 7278540 | Adjustable basket vibratory separator A vibratory separator having a base, a basket movably mounted on the base and for supporting screen apparatus for treating material introduced into the vibratory separator, the basket on a base and pivotable with respect thereto, vibratory apparatus connected to the... | 10/09/2007 |
| 7274990 | Downhole library of master wavelets for VSP-while-drilling applications A controllable seismic source is used in a seismic-while-drilling system for obtaining VSP data. Coded information is sent downhole about the signal generated by said controllable source. The information about the seismic source is used for reconstructing the source... | 09/25/2007 |
| 7261168 | Methods and apparatus for using formation property data This application relates to various methods and apparatus for rapidly obtaining accurate formation property data from a drilled earthen borehole. Once obtained, the formation property data, including formation fluid pressure, may be corrected, calibrated and supplem... | 08/28/2007 |
| 7253401 | Spectral gamma ray logging-while-drilling system A method for determining concentrations of naturally occurring radioactive elements in earth formation by analysis of gamma ray energy spectra measured by at least one gamma ray detector while the borehole is being drilled. Gain of the gamma ray detector is controll... | 08/07/2007 |
| 7219747 | Providing a local response to a local condition in an oil well A method and apparatus for providing a local response to a local condition in an oil well are disclosed. A sensor is provided to detect a local condition in a drill string. A controllable element is provided to modulate energy in the drill string. A controller is co... | 05/22/2007 |
| 7216533 | Methods for using a formation tester A method of testing a downhole formation using a formation tester on a drill string. The formation tester is disposed downhole on a drill string and a formation test is performed by forming a seal between a formation probe assembly and the formation. A drawdown pist... | 05/15/2007 |
| 7212131 | Controlling an underground object In order to control the sonde of an underground object, such as an underground boring tool, a predetermined sequence of rotation steps is applied to the object and that sequence is detected. The detection of the appropriate sequence causes the sonde to change its fu... | 05/01/2007 |
| 7210342 | Method and apparatus for determining gas content of subsurface fluids for oil and gas exploration A process to analyze fluid entrained in well boreholes. The process includes gathering trap gas samples from return of drilling mud at multiple depths. The process also includes the steps of subjecting the samples to mass spectrometry in order to determine mass to c... | 05/01/2007 |
| 7207215 | System, method and apparatus for petrophysical and geophysical measurements at the drilling bit Measurement of petrophysical and geophysical data of formations in a wellbore using a long gauge bit having at least one sensor therewith. The at least one sensor may be installed in at least one flute of the long gauge bit and/or in the long gauge portion thereof. ... | 04/24/2007 |
| 7194813 | Gyrocompass A gyrocompass has a gyrosphere which incorporates a rotor and floats in a liquid tank filled with an electrolyte, and a plurality of electrodes which are disposed in the gyrosphere and the liquid tank, and are respectively opposed through the electrolyte, wherein at... | 03/27/2007 |
| 7182151 | Apparatus and method for horizontal drilling An apparatus and method for horizontally drilling for detecting subsurface features and avoiding such features during closed-loop control of an underground drilling machine. A horizontal drilling system includes a base machine capable of propelling a drill pipe rota... | 02/27/2007 |
| 7176795 | Method and a device for protection of personnel A method and a device for determining if or where a person (10) is located within an area (5), wherein a foot transceiver (8) connected to the person (10) activates one or several identifiable transponders (6) placed in the area ( | 02/13/2007 |
| 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 |
| 7141778 | Semiconductor device, optoelectronic board, and production methods therefor The semiconductor device of the present invention comprises an optical transmission region, and a light receiving part for converting light propagating through the optical transmission region to an electrical signal, wherein the optical transmission region comprises... | 11/28/2006 |
| 7134512 | Method of downhole drilling and apparatus therefor A downhole drilling apparatus suspended by tubing includes a drill bit driven by an electric motor powered by a cable means. The motor is mounted upon a hollow shaft which allows fluid to pass through, so that a fluid circuit along the tube and back along the annulu... | 11/14/2006 |
| 7126340 | Method to characterize microfractured hydrocarbon reservoirs by artificially induced anisotropy of magnetic susceptibility Subterranean hydrocarbon reservoirs are analyzed by characterizing the relative presence and character of microfractures in rock samples from the reservoirs. Core samples are saturated with a suspension of magnetite particles of known concentration. The samples are ... | 10/24/2006 |
| 7114579 | System and method for interpreting drilling date A method is disclosed for identifying potential drilling hazards in a wellbore, including measuring a drilling parameter, correlating the parameter to depth in the wellbore at which selected components of a drill string pass, determining changes in the parameter eac... | 10/03/2006 |
| 7114578 | Method and apparatus for determining drill string movement mode A method for determining movement mode in a drill string includes measuring lateral acceleration of the drill string, determining lateral position of the drill string from the acceleration measurements, and determining mode from the position with respect to time. An... | 10/03/2006 |
| 7100708 | Autodriller bit protection system and method A controller provides an automatic bit protection sequence for an autodriller that can be initiated during the initial stage of set down of the bit within the formation. The automatic protection sequence establishes a setpoint for a parameter of interest (such as we... | 09/05/2006 |
| 7093674 | Drilling formation tester, apparatus and methods of testing and monitoring status of tester An integrated drilling and evaluation system includes a drill string having an interior portion and a drill bit, carried on a lower end, that includes ports for communicating fluid between the interior portion of the drill string and an uncased well bore. A packer, ... | 08/22/2006 |
| 7083006 | Non-rotating sensor assembly for measurement-while-drilling applications An MWD method and apparatus for determining parameters of interest in a formation has a sensor assembly mounted on a slidable sleeve slidably coupled to a longitudinal member, such as a section of drill pipe. When the sensor assembly is held in a non-rotating positi... | 08/01/2006 |
| 7062959 | Method and apparatus for determining downhole pressures during a drilling operation A method and apparatus is provided to determine downhole pressures, such as annular pressure and/or pore pressure, during a drilling operation. A downhole drilling tool includes at least one conduit and a corresponding gauge. The conduit is positioned in the downhol... | 06/20/2006 |
| 7059428 | Monitoring a reservoir in casing drilling operations using a modified tubular Characteristics of a reservoir are monitored during a casing drilling operation using a casing drilling assembly that includes a drill bit for drilling a borehole through an earth formation. A casing tubular is coupled with the casing drilling assembly and includes ... | 06/13/2006 |
| 7059179 | Multi-probe pressure transient analysis for determination of horizontal permeability, anisotropy and skin in an earth formation The specification discloses a downhole tool that determines hydraulic permeability of a downhole formation taking into account one or both of the dip angle of the borehole relative to the formation, and damage to the borehole wall and invasion of borehole fluid—co... | 06/13/2006 |
| 7035778 | Method of assaying downhole occurrences and conditions A method of assaying work of an earth boring bit of a given size and design including establishing characteristics of the bit of given size and design. The method further includes simulating a drilling of a hole in a given formation as a function of the characterist... | 04/25/2006 |
| 7017662 | High temperature environment tool system and method In at least some embodiments, a tool may comprise a tool body and one or more tool components. The tool may further comprise tool electronics located within the tool body, wherein the tool electronics are operable to sense and store tool component characteristics an... | 03/28/2006 |
| 7020557 | Method and apparatus for correcting the depth index for well-log data using pressure measurements A wireline well-logging data acquisition system and method for establishing corrected depth based on pressure readings from two pressure sensors separated by a known distance. ... | 03/28/2006 |
| 7004623 | Disposable sheath for data logger probe and method for measuring and recording temperature in a closed container A disposable sheath for a data logger probe comprises a mounting plate 12 and an elongated sheath 14 attached perpendicularly to the mounting plate for insertion through the wall or top cover and into the interior of a container, the mounting plate hav... | 02/28/2006 |
