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| Number | Title | Issue Date |
| 8020436 | Permanently installed in-well fiber optic accelerometer-based sensing apparatus and associated method Embodiments of the present invention include a fiber optic seismic sensing system for permanent downhole installation. In one aspect, the present invention includes a multi-station, multi-component system for conducting seismic reservoir imaging and monitoring in a ... | 09/20/2011 |
| 7797996 | Permanently installed in-well fiber optic accelerometer-based sensing apparatus and associated method Embodiments of the present invention include a fiber optic seismic sensing system for permanent downhole installation. In one aspect, the present invention includes a multi-station, multi-component system for conducting seismic reservoir imaging and monitoring in a ... | 09/21/2010 |
| 7334452 | Method for characterizing materials by using a mechanical resonator Methods for monitoring a fluid composition include placing a mechanical resonator in the fluid composition and oscillating the resonator. The resonator can be a tuning fork resonator having tines oscillated in opposite directions and in opposite phases. A variable f... | 02/26/2008 |
| 7334651 | Kick warning system using high frequency fluid mode in a borehole Techniques for detecting a kick in a borehole include acquiring a set of measurements with a sonic tool in the borehole; determining borehole mud slowness from the set of measurements; and comparing the mud slowness with a selected criterion, wherein the determining... | 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 |
| 7301345 | While-drilling methodology for estimating formation pressure based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 11/27/2007 |
| 7254999 | Permanently installed in-well fiber optic accelerometer-based seismic sensing apparatus and associated method Embodiments of the present invention include a fiber optic seismic sensing system for permanent downhole installation. In one aspect, the present invention includes a multi-station, multi-component system for conducting seismic reservoir imaging and monitoring in a ... | 08/14/2007 |
| 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 |
| 7210344 | Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configure... | 05/01/2007 |
| 7207397 | Multi-pole transmitter source Methods and apparatus facilitating logging-while-drilling (LWD) using a multi-pole acoustic transmitter source. The multi-pole transmitter source enables measurement of formation velocities, including shear wave velocities through formations that are slower than vel... | 04/24/2007 |
| 7191672 | Single phase sampling apparatus and method A single phase sampling apparatus and method for retrieving a formation fluid sample at or above the bubble point of the sample. The apparatus utilizes a gas charge contained between a sample piston and a charging piston to maintain a formation sample at the desired... | 03/20/2007 |
| 7183117 | Apparatus for measuring characteristics of chemical solution, chemical solution supply apparatus, and method for measuring concentration of chemical solution A supply apparatus for preparing a mixed chemical solution of a predetermined mixing ratio at a low cost and for supplying the mixed chemical solution stably. The supply apparatus includes a measuring apparatus located on an intermediate portion of a flow channel th... | 02/27/2007 |
| 7162918 | 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... | 01/16/2007 |
| 7134493 | Logging system for use in a wellbore A logging system that may be used in a wellbore formed in an earth. A tubular conduit extends from surface into the wellbore and contains a body of wellbore fluid. A logging tool string may be passed from a position within the conduit to a position outside the condu... | 11/14/2006 |
| 7128144 | Formation testing and sampling apparatus and methods Systems and methods for downhole formation testing based on the use of one or more elongated sealing pads capable off sealing off and collecting or injecting fluids from elongated portions along the surface of a borehole. The modified sealing pads increase the flow ... | 10/31/2006 |
| 7120541 | Sonic well logging methods and apparatus utilizing parametric inversion dispersive wave processing Methods and related apparatus for generating dispersion curves and conducting shear slowness logging are set forth. The methods include backpropagating detected dispersive waveforms in the Fourier domain while accounting for dispersion in an anisotropic and inhomoge... | 10/10/2006 |
| 7085194 | Methods and systems for calibrating acoustic receivers A method and system for calibrating acoustic receivers (112). The method and system facilitate calibrating the acoustic receivers (112) while they are mounted to a downhole acoustic tool (102). Calibrating the acoustic receivers (112) in ... | 08/01/2006 |
| 7063141 | Apparatus for agitated fluid discharge The pressure reading tool includes a housing with an interior chamber and an orifice extending from the chamber to the exterior of the housing. A pulse member with a magnetostrictive ring and an excitation source are disposed within the chamber to produce a highly a... | 06/20/2006 |
| 7042802 | Determination of stress characteristics of earth formations A method for determining the maximum and minimum horizontal stresses of formations surrounding a borehole includes the following steps: suspending a logging device in the borehole; transmitting sonic energy from the logging device to establish flexural waves in the ... | 05/09/2006 |
| 7036363 | Acoustic sensor for downhole measurement tool An acoustic sensor for use in a downhole measurement tool is provided. The acoustic sensor includes a piezo-composite transducer element. In various exemplary embodiments, the acoustic sensor further includes a composite backing layer, at least one matching layer, a... | 05/02/2006 |
| 7035165 | Imaging near-borehole structure using directional acoustic-wave measurement Directional acoustic measurements made in the borehole are used for imaging a near-borehole geological formation structure and determination of its orientation. Four-component cross-dipole data set measured in a deviated borehole in combination with the directionali... | 04/25/2006 |
| 7025143 | Method for removing a deposit using pulsed fluid flow The pressure reading tool includes a housing with an interior chamber and an orifice extending from the chamber to the exterior of the housing. A pulse member with a magnetostrictive ring and an excitation source are disposed within the chamber to produce a highly a... | 04/11/2006 |
| 6978672 | Wireline apparatus for measuring steaming potentials and determining earth formation characteristics Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 12/27/2005 |
| 6968740 | Systems and methods for determining an acoustic and/or thermal characteristic of a target material A system and method for determining an acoustic and/or thermal characteristic of a target material are provided. The system includes an acoustic source arranged to direct a sound wave at a target material; a device for measuring a sound pressure generated by at leas... | 11/29/2005 |
| 6964206 | Single phase sampling apparatus and method A single phase sampling apparatus and method for retrieving a formation fluid sample at or above the bubble point of the sample. The apparatus utilizes a gas charge contained between a sample piston and a charging piston to maintain a formation sample at the desired... | 11/15/2005 |
| 6957572 | Apparatus and methods for measuring mud slowness in a borehole A method for determining mud slowness of a mud in a borehole includes determining slowness as a function of frequency for at least one fluid mode from a set of measurements acquired with a sonic tool in the borehole; and determining the mud slowness from the slownes... | 10/25/2005 |
| 6956791 | Apparatus for receiving downhole acoustic signals The invention relates to an apparatus for receiving downhole acoustic signals, processing the signals into electric signals, then transmitting the signals wirelessly to a remote above-surface monitoring station. The apparatus is mountable to an above-surface rotatab... | 10/18/2005 |
| 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 |
| 6920082 | Method and apparatus for determining earth formation shear-wave transverse isotropy from borehole stoneley-wave measurements The present invention is a method of determining formation horizontal shear wave velocity, formation transverse isotropy and an effective logging tool modulus. The method comprises determining an effective logging tool modulus by modeling the logging tool as a fluid... | 07/19/2005 |
| 6748328 | Determining fluid composition from fluid properties A method for determining the composition of a fluid by using measured properties of the fluid. One embodiment of the method of the current invention generally comprises: selecting a fluid property that has a response to fluid composition that is linear, or can be ap... | 06/08/2004 |
| 6480118 | Method of drilling in response to looking ahead of drill bit A method for improving ROP and reducing hazards in drilling subterranean wells by using an acoustical system 15 to look ahead of the drill bit 14, detects and analyzes geologic features ahead of the bit 14 which may be qualified as drilling hazards 17. De... | 11/12/2002 |
| 6474151 | Instrument for soil surface analysis and use for analyzing the wall of a well in particular an oil well The present invention relates to analysis tools for analyzing the ground 1, from a surface 2 thereof, by means of a sonde 3 having a given analysis lobe 4 and a resolution time T. The tool of the invention is essentially characterized by the fact that it ... | 11/05/2002 |
| 6415648 | Method for measuring reservoir permeability using slow compressional waves The present invention provides a method that is useful in determining the permeability of rock within a subterranean formation surrounding a borehole. The method involves the establishment of a compressional wave in the borehole rock of interest and the s... | 07/09/2002 |
| 6351991 | Determining stress parameters of formations from multi-mode velocity data A method for determining unknown stress parameters in earth formation measures velocities in four sonic transmissions modes (compression, fast shear, slow shear and Stoneley) at a series of depths. Relationships between measured velocities and other measu... | 03/05/2002 |
| 6173606 | Logging tool for cement evaluation A γ-ray tool and acoustic logging instrument combination includes in an elongated housing a transmitter for sound and at least one and preferably two, sound sensors located at predetermined distances above the transmitter. The sound sensors are separated... | 01/16/2001 |
| 5969241 | Method and apparatus for measuring formation pressure An earth formation tool measures pressure from within a borehole. A portion of the borehole wall is isolated from surrounding borehole fluids by placing a chamber of a borehole tool against the borehole wall. The chamber comprises a recess in an exterior ... | 10/19/1999 |
| 5886255 | Method and apparatus for monitoring mineral production Long-term changes in the distribution of a mineral in a subsurface deposit, due to commercial production of the mineral, are monitored by suitable instrumentation. The monitoring instrumentation is installed in combination with commercial mineral producti... | 03/23/1999 |
| 5798488 | Acoustic sensor An acoustic sensor for use as part of a drill string in a borehole has an acoustic transducer which vibrates the drill bit in contact with the rock at the end of the borehole to generate acoustic signals in the rock. These acoustic signals propogate throu... | 08/25/1998 |
| 5780784 | Cancellation of tool mode signal from combined signal A system for eliminating the tool mode signal from a received combined signal comprising both tool mode and formation mode components, comprising: a formation receiver for receiving said combined signal, a reference receiver for receiving a tool mode refe... | 07/14/1998 |
| 5758539 | Logging method and system for measuring mechanical parameters of the formations crossed through by a borehole The present invention relates to a method for obtaining a recording or log of measurements substantially comparable to the acoustic impedance of the formations crossed through by the borehole. The measurements are obtained from an acceleration detector (1... | 06/02/1998 |
