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| Number | Title | Issue Date |
| 7463035 | Method and apparatus for the use of multicomponent induction tool for geosteering and formation resistivity data interpretation in horizontal wells Measurements made with a multicomponent logging instrument when used in a substantially horizontal borehole in earth formations are diagnostic of the direction of beds relative to the position of the borehole. When the logging instrument is conveyed on a drilling as... | 12/09/2008 |
| 7463551 | Method of generating directional low frequency acoustic signals and reflected signal detection enhancements for seismic while drilling applications The present invention provides a method and apparatus for using an acoustic logging tool conveyed in a borehole in an earth formation for determining a characteristic of the formation. The method comprises using a first acoustic source for generating an acoustic sig... | 12/09/2008 |
| 7453372 | Identification of the channel frequency response using chirps and stepped frequencies The transfer function of the communication channel in a mud pulse telemetry system is determined by sending a known signal through the channel and spectral analysis of the received signal. The known signal may be a chirp signal or a stepped frequency signal. Based o... | 11/18/2008 |
| 7448263 | Practical methods to estimate horizontal and vertical permeabilities In one method, the permeabilities are obtained by correcting the geometric factor derived from combining the FRA analysis and buildup analysis. ... | 11/11/2008 |
| 7448262 | Determination of correct horizontal and vertical permeabilities in a deviated well In one method, the permeabilities are obtained by correcting the geometric factor derived from combining the FRA analysis and buildup analysis. In a second method, the permeabilities are obtained by combining the spherical permeability estimated from buildup analysi... | 11/11/2008 |
| 7446308 | Method of calibrating multi-channel nuclear energy spectra Measurements made with a nuclear logging tool are partitioned into bins to provide an energy spectrum. The energy spectrum is calibrated by maximizing a measure of similarity with a reference spectrum. ... | 11/04/2008 |
| 7439494 | Method and apparatus for determining the thermal neutron capture cross-section of a subsurface formation from a borehole Data acquired using a pulsed nuclear source are susceptible to two sources of error. One error is due to large statistical noise towards the end of an acquisition window. Another source of error is the contamination of the early portion of the data by borehole and o... | 10/21/2008 |
| 7432716 | Method for compensating dielectric attenuation in downhole galvanic measurements A logging tool used in a borehole having non-conductive mud. The tool includes a known inductance in series with an electrode. The quality factor of a circuit that includes the electrode, the inductance and the earth formation is indicative of the resistivity of the... | 10/07/2008 |
| 7432500 | Azimuthal binning of density and porosity data A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. A magnetometer on the drill collar measures the relative azimuth of the ... | 10/07/2008 |
| 7425827 | Method and apparatus for formation evaluation and borehole size determination The quality factor of a NMR-antenna depends upon mud conductivity, formation resistivity and the borehole size. The Q of the antenna is measured. From measurement of one of formation conductivity or borehole size, the other can be determined. ... | 09/16/2008 |
| 7423550 | Two sensor impedance estimation for uplink telemetry signals Measurements made with dual sensors (flow rate or pressure) are used to attenuate pump noise in a mud pulse telemetry system. ... | 09/09/2008 |
| 7423792 | Holographic printer A single method and apparatus for producing many of the most common types of hologram from digital data is disclosed. The data are generated entirely by a computer as a 3-D (animated) model or from multiple 2-D camera images taken of a real 3-D (moving) object or sc... | 09/09/2008 |
| 7424365 | Apparent dip angle calculation and image compression based on region of interest A data compression technique for MWD applications uses feature detection, extraction, followed by image compression for only the region(s) of interest. The detection approach processes data in real time. It triggers on the start and end of a feature without processi... | 09/09/2008 |
| 7420367 | High-frequency induction imager with concentric coils for MWD and wireline applications An induction logging tool having concentric transmitter and receiver antennas can be used to make measurements of earth formations at frequencies up to 500 MHz. The antennas may be mounted on the mandrel of a bottomhole assembly for MWD applications, or may be pad m... | 09/02/2008 |
| 7421345 | Geosteering in earth formations using multicomponent induction measurements A multicomponent induction logging tool is used on a MWD bottomhole assembly. Multifrequency focusing that accounts for the finite, nonzero, conductivity of the mandrel is applied. Using separation of modes, the principal components and a direction of a conductivity... | 09/02/2008 |
| 7416023 | Formation pressure testing apparatus with flexible member and method of formation pressure testing An apparatus and method for use in determining pressure at a formation of interest in-situ. A carrier carrying a tool is conveyed in a borehole. The tool includes a sealing member and a port exposable to the formation of interest. A formation fluid sampling chamber ... | 08/26/2008 |
| 7413032 | Self-controlled directional drilling systems and methods System and method of controlling a trajectory of a wellbore comprises conveying a drilling assembly in the wellbore by a rotatable tubular member. The drilling assembly includes a drill bit at an end thereof that is rotatable by a drilling motor carried by the drill... | 08/19/2008 |
| 7414407 | Method and apparatus for directional resistivity measurement while drilling A resistivity tool has a body with at lest one pair of grooves on its exterior oriented orthogonal to the tool axis. A coil antenna is oriented orthogonal to the grooves in a hole intersecting the grooves and oriented orthogonal to the tool axis. The antenna and an ... | 08/19/2008 |
| 7410011 | Method to determine the concentration of deuterium oxide in a subterranean formation The extent of invasion of a water-based drilling fluid into a formation may be determined using at least two tracers where one is deuterium oxide and the other is a water-soluble tracer. One such method includes introducing a drilling fluid having an aqueous phase a... | 08/12/2008 |
| 7409999 | Downhole inflow control device with shut-off feature A system and method for controlling inflow of fluid into a production string. In aspects, the invention provides a downhole sand screen and inflow control device with a gas or water shut-off feature that can be operated mechanically or hydraulically from the surface... | 08/12/2008 |
| 7408355 | Borehole conductivity simulator verification and transverse coil balancing Calibration of the arrays of a multicomponent induction logging tool is achieved by positioning the tool horizontally above ground. The upper and lower housings of the tool are connected by a borehole conductivity simulator which as a resistance comparable to that o... | 08/05/2008 |
| 7405563 | Compensation of magnetic influence in a MWD system The present disclosure provides a downhole tool that includes a magnetometer and a nuclear magnetic resonance (NMR) sensor. One or more compensating magnets are provided on the tool to cancel or offset the effect of the magnetic field of the magnets of the NMR senso... | 07/29/2008 |
| 7402797 | Method and apparatus for determining aluminum concentration in earth formations Elemental analysis of an earth formation (including Aluminum) is obtained using measurements from a gamma ray logging tool. The inelastic spectrum of Aluminum is determined from measurements made in a water tank. From the elemental analysis, an estimate of the miner... | 07/22/2008 |
| 7398695 | Universal converter plate for pressure transmitters An apparatus for mating a base unit with a transmitter unit has a first face provided with a plurality of bores that spatially conform to a pattern of the mounting elements of the base unit and a second face that has a plurality of bores that spatially conform to th... | 07/15/2008 |
| 7400262 | Apparatus and methods for self-powered communication and sensor network A system for communicating between a first location and a second location comprises a jointed tubular string having a first section and a second section connected at a connection joint, with the tubular string having a fluid in an internal passage thereof. A first a... | 07/15/2008 |
| 7395704 | Method and apparatus for downhole fluid analysis using molecularly imprinted polymers The present invention provides a downhole method and apparatus using molecularly imprinted polymers to analyze a downhole fluid sample or determine the percentage of oil based mud filtrate contamination in a formation fluid sample. ... | 07/08/2008 |
| 7395864 | Method and apparatus for preventing slug flow in pipelines Disclosed is a method and system for controlling the formation of liquid or gas slugs along a pipeline. In embodiments, an injection unit injects a liquid surface tension reducing agent, such as a foamant, into the pipeline upstream of the high point. A control unit... | 07/08/2008 |
| 7396924 | Building additives based on purified hydroxyalkyl guar The present invention relates to highly hydroxyalkylated, glyoxal crosslinked, purified hydroxyalkyl guar useful as additive in the building industry, and to a method for its preparation. ... | 07/08/2008 |
| 7397250 | High resolution resistivity earth imager Phase-sensitive measurements are made by a resistivity imaging tool in a borehole having non-conductive mud in a conductive earth formation at a plurality of frequencies. From the phase sensitive measurements, the formation resistivity can be determined with higher ... | 07/08/2008 |
| 7394258 | High resolution resistivity earth imager Impedance measurements made by a galvanic resistivity tool in a borehole in an earth formation are corrected by a factor that depends on the mud conductivity and the mud dielectric constant. Standoff measurements are not necessary. ... | 07/01/2008 |
| 7389787 | Closed loop additive injection and monitoring system for oilfield operations A system is provided that monitors at the wellsite injection of additives into formation fluids recovered through wellbores and controls the supply of such additives from remote locations. The selected additive is supplied from a source at the wellsite into the well... | 06/24/2008 |
| 7392137 | Determination of formation anistrophy, dip and azimuth Multifrequency focusing is applied to measurements made with a multicomponent resistivity logging tool in an earth formation having resisitivity anisotropy. From knowledge of relative dip and azimuth of the borehole relative to the formation, two modes can be separa... | 06/24/2008 |
| 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 |
| 7389184 | 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... | 06/17/2008 |
| 7387021 | Method and apparatus for reservoir characterization using photoacoustic spectroscopy A method and apparatus are provided that assess reservoir compartmentalization by determining whether there are compositional differences such as whether the isotopic ratios of carbon (13C/12C) or of oxygen (17O/18O) are the same or different in various parts of the... | 06/17/2008 |
| 7387162 | Apparatus and method for selective actuation of downhole tools The present invention provides systems, methods and devices for selectively firing a gun train formed of a plurality of guns. Conventionally, the guns each include a detonator assembly that detonates upon receiving a firing signal transmitted by a surface source. In... | 06/17/2008 |
| 7383891 | Hydraulic set permanent packer with isolation of hydraulic actuator and built in redundancy A packer includes one or more anchors for securing the packer in a wellbore and a pair of seal elements that form a fluid seal. The packer assembly is hydraulically set and, thus, it can be located at any desired position within the wellbore. The packer assembly is ... | 06/10/2008 |
| 7385401 | High resolution resistivity earth imager Measurements made by a resistivity imaging tool in a borehole having non-conductive mud in a conductive earth formation are corrected using the tool standoff. The correction involves removing a calibration signal determined in a medium of high conductivity from the ... | 06/10/2008 |
| 7379818 | Correction of cross-component induction measurements for misalignment using comparison of the XY formation response A misalignment angle between the transmitter and receiver antenna of a multicomponent induction logging tool are estimated from quadrature component signals at multiple frequencies. A transmitter antenna having a first axial direction on a logging tool is excited at... | 05/27/2008 |
| 7375530 | Method for signal enhancement in azimuthal propagation resistivity while drilling Cross-component measurements made at a plurality of toolface angles are processed to remove bias. The amplitude of the resulting sinusoid is used to estimate a distance to an interface in an earth formation. ... | 05/20/2008 |
