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8086408 |
Method for positioning a wire using sensor information
A method for positioning a wire having nodes and streamers is provided herein. The wire can be secured to tow lines secured to a floating vessel for detecting near surface geology formations. The...
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7925483 |
Methods for visualizing distances between wellbore and formation boundaries
A method for displaying a formation model while drilling a wellbore in the formation includes operating a well logging instrument at a measurement point in the formation along a wellbore while the...
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7885142 |
Method and apparatus for logging foam cement in cased boreholes
An acoustic logging system that measures distribution of foam cement and other material in a casing-borehole annulus. The distribution is preferably displayed as map. A borehole tool utilizes at...
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7834519 |
Method and device for precisely resisting and moving high load
A precise and high load resistance moving method to perform fine movement positioning of the moving body, by fixing a piezoelectric element which generates a shear deformation, to a bottom surface...
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7676326 |
VH Reservoir Mapping
A method and system of detecting and mapping a subsurface hydrocarbon reservoir includes determining ratio data for a plurality of orthogonal spectral components of naturally occurring low...
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7638923 |
Operating method for a hydraulic injection valve comprising a piezoelectric actuator and a control unit
The invention relates to a method and a control unit for operating a hydraulic injection valve, which comprises at least one piezoelectric actuator (2), a displaceable component (3) and a hydraulic...
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7630872 |
Methods for visualizing distances between wellbore and formation boundaries
A method for displaying a formation model includes displaying a trajectory representing a three-dimensional structure of the wellbore; and displaying objects representing a bed boundary along the...
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7622847 |
Method and device for precisely resisting and moving high load
A precise and high load resistance moving method to perform fine movement positioning of the moving body, by fixing a piezoelectric element which generates a shear deformation, to a bottom surface...
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6697710 |
Gas pipe explorer robot
A gas pipe explorer formed of a plurality of connecting elements, and an articulation element between the connected elements. The connected elements include drive capabilities, and the articulation...
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6671600 |
Production method using global positioning system
A method of producing a projected useful form from an existing body delimited by a three-dimensional envelope using a tool mounted on a machine cooperating with a global satellite positioning...
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6205087 |
Sonic data logging system
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6147929 |
Method for predicting continuous and discontinuous waveguide targets using interwell seismic signature characteristics
A method for planning continuity logging surveys and for detecting the presence of a continuous or discontinuous low-velocity inclusion in a subterranean geological formation. To detect the...
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6078869 |
Method and apparatus for generating more accurate earth formation grid cell property information for use by a simulator to display more accurate simulation results of the formation near a wellbore
A Petragrid method and apparatus generates grid cell property information that is adapted for use by a computer simulation apparatus. An interpretation workstation includes at least two software...
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5809163 |
Method of characterizing texture heterogeneities of geological formations traversed by a borehole
A method of characterizing texture heterogeneities in a geological formation traversed by a borehole. The method records an image of the borehole wall such as that provided by Schlumberger's...
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5594176 |
Scan assembly and method for transferring power and data across a rotary interface
An ultrasonic scan assembly for use in inspecting downhole gas pipes comprises a sensor section which rotates in relation to an end section that remains essentially level forming a rotating...
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5519668 |
Methods and devices for real-time formation imaging through measurement while drilling telemetry
Methods for providing an image at the surface of a formation surrounding a borehole in real-time include associating resistivity measurements with a predetermined number of preselected toolface...
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H001289 |
Borehole televiewer system depth monitoring and recording system
A method and an apparatus for recording the depth of a well logging apparatus is provided. The method and apparatus include the direct acquisition of broad depth information from the logging system...
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5239467 |
Method for enhancing geophysical data by nonlinear compression of the dynamic range
The present invention provides an improved method of processing and displaying geophysical data so as to enhance the evaluation and interpretation of subtle variations in the earth's geological and...
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5237539 |
System and method for processing and displaying well logging data during drilling
A system and method for processing and displaying well log data that provides real time and lag time data combined into a format which can be graphically printed using a printer interface to a...
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5179541 |
Acoustic borehole televiewer
A system is provided for optimizing the output power of an acoustic wavetrain emitted from a transducer rotatably mounted in a downhole borehole televiewer for scanning the sidewall of the...
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5164548 |
Method and apparatus for ultrasonic scanning of a borehole having improved sensor array and timing circuit
A borehole televiewer is modified to provide an improved signal-to-noise ratio by utilizing a series of receivers arranged in a planar array configuration with respect to a centrally located...
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5134471 |
System for monitoring the walls of a borehole using a video camera
A borehole camera monitoring system comprises a camera head assembly adapted to be lowered into a borehole by means of a cable and control unit located above ground for generating a control signal...
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5121363 |
Fracture detection logging tool
A method and apparatus by which fractured rock formations are identified and their orientation may be determined includes two orthogonal motion sensors which are used in conjunction with a downhole...
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5038378 |
Method and apparatus for smoothing measurements and detecting boundaries of features
A method and apparatus are described for removing noise by smoothing fine resistivity measurements made with a tool from inside a borehole penetrating an earth formation. Pixel values...
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4999817 |
Programmable gain control for rotating transducer ultrasonic tools
A rotary ultrasonic transducer logging tool is set forth which has a transmitter connected to a transducer for transmitting pulses periodically, and a rotor with angle sensor connected thereto. One...
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4991095 |
Process for three-dimensional mathematical modeling of underground geologic volumes
A process using a stored program processor for modeling a geologic volume which has inclined, stacked layers of sedimentary deposits. The process employs a model volume with layers of cells which...
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4984221 |
Borehole acoustic logging system having automatic reflection signal level control
A borehole televiewer employs a transducer energized by repetitive voltage pulses for generating pulses of acoustic energy for transmission to the walls of a borehole and for detecting direct...
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4969128 |
Borehole acoustic logging system having synchronization
An elongated borehole logging tool employs an acoustic energy transducer for directing acoustic energy pulses toward a borehole wall at a repetition rate synchronized with rotational speed of the...
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4962490 |
Acoustic logging method for determining the dip angle and dip direction of a subsurface formation fracture
A deviated borehole penetrating a subsurface formation and intersected by a formation fracture is surveyed with a borehole televiewer acoustic logging system. Relative fracture dip angle and dip...
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4916673 |
Method and apparatus for detecting the peak of an analog signal
A method and apparatus for processing a signal generated by a borehole scanning system of the type in which periodic electrical firing pulses initiate a plurality of corresponding acoustic energy...
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4870627 |
Method and apparatus for detecting and evaluating borehole wall fractures
A method and apparatus are described for generating a quick look display of an acoustic investigation of a borehole wherein a parameter of interest is derived from vertically spaced sonic receivers...
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4867264 |
Apparatus and method for investigating wellbores and the like
An apparatus useful in investigating the wall surfaces of a structure defining a cavity comprising: a tool having a periphery and being capable of being at least partially located in the cavity;...
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4855965 |
Time ramped gain for borehole televiewer
Amplifier gain is time ramped to increase amplification of the signal with increasing mud transit time and attenuation. Amplitude, ramp slope, and ramp onset time are independently controllable...
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4855820 |
Down hole video tool apparatus and method for visual well bore recording
An apparatus and method of visually examining the sidewalls of a bore hole include a down hole video tool lowered into the bore hole by means of a cable and winch on the surface. The apparatus...
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4852069 |
Thin bed evaluation device
The microstructure of thinly laminated earth formations is acoustically determined with a logging tool having an acoustical transducer pad mounted for measuring while in contact with the borehole...
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4847814 |
Three-dimensional borehole televiewer display
A system is disclosed for creating a three-dimensional image of data obtained from scanning a borehole wall with an acoustic transducer. Each scan produces an orientation pulse and a series of...
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4837753 |
Method and apparatus for logging a borehole
Method and apparatus for logging a borehole of the type in which an acoustic energy signal scans the borehole wall at a plurality of different depths thereby generating signals reflected from a...
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4829488 |
Drive mechanism for borehole televiewer
A borehole televiewer apparatus includes a housing section having a cavity for the disposition of an acoustic signal transmitting and receiving transducer. An elongated threaded rod is disposed in...
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4803667 |
Televiewer processing system
Data received from a sonde in a borehole is enhanced by first measuring the relative travel time of a signal transmitted from the sonde and reflected from an area in the wall of a borehole. This...
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4780858 |
Borehole televiewer mudcake monitor
In connection with a borehole televiewer system (10), the delta time (51) between low threshold (54) crossing (T1) and signal peak arrival (T2) provides a measure of mudcake (43) thickness.
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4774573 |
Method and apparatus for generating a video display from signals produced by borehole scanning
Apparatus for creating a video display from information generated by acoustically scanning a reflecting boundary circumferential of a borehole. A downhole tool generates a first signal each time a...
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4740930 |
Surface processing and display of borehole televiewer signals
Method and apparatus for storing, displaying and processing borehole televiewer signals, comprises digitizing means for the electrical scan signals (ESS), and for storing them in a register at slow...
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4736348 |
Method and apparatus for logging the characteristics of materials forming the walls of a borehole
A borehole televiewer logging tool employs a transducer assembly having a transmitter of acoustic energy pulses and a receiver of acoustic energy pulses representing reflections of the transmitted...
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4711122 |
Flexible mud excluder for borehole televiewer
The present invention is an improved mud excluder fitted around a rotating acoustic transducer of a borehole televiewer to exclude mud from the borehole televiewer. This mud excluder has: (a) a...
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4698911 |
Method of using a borehole televiewer dipmeter for determining true dip and azimuth
A method for determining the true dip and azimuth of bedding planes in a formation penetrated by a borehole using borehole televiewer measurements. The method corrects for borehole deviation and...
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4691307 |
AGC circuit for televiewer
A borehole televiewer circuit for compensating for out-of-roundness of a borehole. The circuit comprises an automatic gain control circuit having time constants that allow detection of borehole...
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4686625 |
Method and apparatus for generating a display of well logging measurements
Initialization data independent of logging curve data values (such as grid definitions and starting depths) are transmitted to a remote terminal where well log curve displays are desired. Data...
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4672588 |
Method for displaying acoustic well logging data by producing travel time stacks
A method for producing a display of acoustic signals received during full waveform acoustic well logging. In a preferred embodiment, the signals received at the individual receiver (or receivers)...
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4661932 |
Dynamic downhole recorder
A method and apparatus allows dynamic data to be recorded in a drill string for later playback at the surface. The system includes a transducer located in a sub in the drill string which provides...
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4633446 |
Scrolling well logging data display method and apparatus
An improved method and apparatus for displaying visual indications of subsurface-derived earth measurements. Digital logging measurements are delivered to video circuits for graphic display. The...
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