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| Number | Title | Issue Date |
| 7663968 | Method of processing geological data There is provided a method of processing geological data during drilling of a borehole for improving accuracy of the geological data. The method includes a first step of determining from instrumentation (100) associated with a string (50) of drilling p... | 02/16/2010 |
| 7433786 | Method of estimating geological formation depths by converting interpreted seismic horizons the time domain to the depth domain A method of estimating geological location depths by converting horizon data from the time domain to the depth domain is provided wherein the method includes at least a data accumulation step and a data evaluation step, and wherein the data evaluation step further i... | 10/07/2008 |
| 7424928 | Apparatus, system and method for flexibly coupling sensors to a downhole tool A downhole receiver for gathering seismic and sonic data from inside a borehole includes a substantially tubular housing adapted for axial connection to a tool string, and one or more sensors. A damping element is provided to flexibly couple each sensor to the tubul... | 09/16/2008 |
| 7411864 | Method for processing signals in a cement bong logging tool A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 08/12/2008 |
| 7357197 | Method and apparatus for monitoring the condition of a downhole drill bit, and communicating the condition to the surface A method and apparatus for signalling the surface operator about downhole conditions. Sensors located downhole collect data while drilling and the data is processed to determine bit failure, for example. When the sensor data indicates a failure, the pressure of dril... | 04/15/2008 |
| 7346454 | Method and apparatus for improved depth matching of borehole images or core images A method for depth matching borehole images and/or core section images is disclosed wherein signals from sensors at different levels on a logging tool are converted into an averaged signal representing the average bed signal at the center of the borehole at each of ... | 03/18/2008 |
| 7328621 | Method of processing oscillatory data A method of processing oscillatory response data from a resonant system includes: obtaining data measuring an oscillatory response of the system at a plurality of evenly spaced time intervals; obtaining a plurality of reference frequencies from the data at a plurali... | 02/12/2008 |
| 7196634 | Systems for predicting earthquakes and methods of employing such systems A method of predicting earthquakes includes the step of positioning a first transducer array adjacent to a seismically active region and below the water table, i.e., within the zone of saturation. The first transducer array includes a first plurality of seismometers... | 03/27/2007 |
| 6942043 | Modular design for LWD/MWD collars A modular system for packaging of sensors and related electronics for an MWD system. A drill collar housing is provided with one or more cavities for receiving sensor modules that are adapted to sense one or more wellbore conditions. The sensor modules are removable... | 09/13/2005 |
| 6870482 | Systems for predicting earthquakes and methods of employing such systems A method of predicting earthquakes includes the step of positioning a first transducer array adjacent to a seismically active region and at least about 3 meters below the surface of the crust of the Earth. The first transducer array includes a first plurality of sei... | 03/22/2005 |
| 6782322 | Method, apparatus and computer program product for creating ream section from memory data based on real-time reaming A method for generating a depth-indexed data structure for a reaming operation includes receiving, by a software process, i) well logging data that includes time-indexed data and depth measurement data for an oil well drilling rig, ii) a selection identifying a dept... | 08/24/2004 |
| 6739692 | Ink jet recording apparatus The present invention provides an ink jet recording apparatus including a carriage to which a recording head for effecting recording on a recording material by discharging ink and an ink tank for containing ink to be supplied to the recording head are detachably mou... | 05/25/2004 |
| 6477112 | Method for enhancing resolution of earth formation elastic-wave velocities by isolating a wave event and matching it for all receiver combinations on an acoustic-array logging tool Acoustic logging data are obtained using a logging tool including at least on transmitter and a plurality of receivers. A waveform matching inversion is performed to obtain formation slowness profiles at various resolutions ranging from the total length o... | 11/05/2002 |
| 6386026 | Cuttings sample catcher and method of use A sample catcher comprises an inclined sampling screw conveyor which intercepts a continuous stream of drill cuttings from a shaker. A vaned metering rotor accepts a plurality of discrete samples from adjacent the conveyor's discharge. The vaned rotor is ... | 05/14/2002 |
| 6091669 | Method of determining, displaying and using the relative changes of elastic modulus and density of underground rock The general object of the present invention is to provide a method for determining and displaying the relative changes of elastic moduli and that of density of geologic formations and for utilizing these relative changes and plottings for gas/oil explorat... | 07/18/2000 |
| 5680906 | Method for real time location of deep boreholes while drilling The present invention is concerned with a system for the real time location of deep boreholes while drilling. The system includes a plurality of sensors sensitive to seismic vibrations disposed in an area where a borehole is to he drilled, the sensors bei... | 10/28/1997 |
| 5541587 | System for determining the true depth of an electrical logging tool within a wellbore The present invention is a system for determining the depth of a logging tool attached to a cable extended into a wellbore penetrating an earth formation. In a preferred embodiment, the system includes a circuit for generating a measurement of phase shift... | 07/30/1996 |
| 5511037 | Comprehensive method of processing measurement while drilling data from one or more sensors The present invention relates to the transformation of measurement while drilling (MWD) data acquired during various time intervals into corresponding equal depth intervals. Once the data are transformed into the depth domain, depth based statistical, fil... | 04/23/1996 |
| 5388044 | Dipmeter processing technique A method of dipmeter processing fits a thickness conserving mathematical model to a folded or faulted subsurface sedimentary geological structure, and may be used with vertical as well as nonvertical or deviated boreholes. An initial estimate of the geome... | 02/07/1995 |
| 5321982 | Method for measuring the rate of penetration of an equipment progressing in a well The method comprises using a transmitting unit and at least two receiving units (8,10) arranged in two different places along well equipment (2). Each receiving unit forms an image or signature of wall portions which pass it. The signatures of wall portio... | 06/21/1994 |
| 5285388 | Detection of fluid reflection for echo sounding operation An echo sounding system includes an acoustic gun which is mounted to the wellhead of a borehole. The acoustic gun produces an acoustic pulse which is transmitted down the borehole. A tubing string is installed in the borehole and has substantially evenly ... | 02/08/1994 |
| 5130949 | Geopressure analysis system Seismic data is combined with well log data to generate a two-dimensional geopressure prediction display; this permits deviated and horizontal well planning plus lithology detection. Shale fraction analysis, compaction trend, and seismic velocity may be a... | 07/14/1992 |
| 5117399 | Data processing and display for echo sounding data An echo sounding system includes a acoustic gun which is mounted to the wellhead of a borehole. The acoustic gun produces a acoustic pulse which is transmitted down the borehole. A tubing string is installed in the borehole and it has substantially evenly... | 05/26/1992 |
| 5051962 | Computerized truck instrumentation system In a representative embodiment of the invention described herein, a well logging system for investigating subsurface formations is controlled by a general purpose computer programmed for real-time operation. The system is cooperatively arranged to provide... | 09/24/1991 |
| 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 representative of the resistivity measurements are examined to determin... | 08/06/1991 |
| 5005159 | Continuity logging using differenced signal detection A method of determining the continuity of a lithographic layer located between two vertical boreholes is disclosed. A seismic source is lowered in the first borehole while simultaneously a receiver pair, preferably a pair of "vertical" geophones spaced ap... | 04/02/1991 |
| 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 and displayed in a laterally continuous display log where... | 09/26/1989 |
| 4862424 | Interferometric means and method for accurate determination of fiberoptic well logging cable length A method and means for determining the amount of stretch in a well logging cable is disclosed. An optical fiber is run into a well with a logging cable and looped back to the surface. A second optical fiber of nominal length is maintained on the surface. ... | 08/29/1989 |
| 4862425 | Device for acquiring seismic data in a borehole and transmission thereof to a central control and recording system A device is provided for acquiring data coming from sensors distributed in several probes which may be anchored in a well or borehole and transmission thereof to a central control and recording system, including a remote control assembly for checking oper... | 08/29/1989 |
| 4809239 | Method for evaluating parameters related to the elastic properties of subsurface earth formations Three-axis vertical seismic profile measurements are analyzed to derive values for the velocity vp and angel of incidence .PSI.p of a plane compressional wave at the borehole and for the shear wave velocity vs and angle of... | 02/28/1989 |
| 4803479 | Electrical phase measurement means and method for accurate determination of well logging cable length A method and apparatus for determining the vertical location of a logging tool in a wellbore is disclosed. An electrical signal is transmitted through a conductor in a well logging cable and a second conductor in the surface. Change in length of the well ... | 02/07/1989 |
| 4800981 | Stabilized reference geophone system for use in downhole environment For seismic exploration, a method and apparatus are set forth wherein geophones, preferably arranged in XYZ relationship to one another fixedly within a hermetically sealed housing, are located in a deviated well. The position of the housing with respect ... | 01/31/1989 |
| 4791619 | Method of detecting and characterizing features in a borehole Using waveforms or travel time acquired by multitransmitter and/or borehole sonic tools, acoustic velocity (or slowness) is computed for compressional, shear, and Stoneley waves using direct phase determination (DPD), the slowness time coherence (STC) met... | 12/13/1988 |
| 4683556 | Method for identifying arrival times of waveforms on acoustic borehole well logs A well logging tool employing at least one transmitter and at least one receiver is incrementally advanced through a borehole. A plurality of recorded well log traces from successive ones of the incremental depth points for a single transmitter-receiver p... | 07/28/1987 |
| 4610005 | Video borehole depth measuring system A video system measures the position of the traveling block of a drilling rig to determine borehole depth and the rate of drill bit penetration. A television camera is arranged to track the vertical movement of the traveling block of a drilling rig betwee... | 09/02/1986 |
| 4587641 | Downhole fracture analysis A method and apparatus using a multiple transducer acoustic logging tool to detect fractures surrounding a borehole, particularly fractures that do not intersect the borehole wall. The transducers are actuated to produce broad band width pulses and signal... | 05/06/1986 |
| 4586137 | Method for generating variable well logging data composites Method for generating a composite logging data base from two separate historical data bases in a form suitable for further on-site computerized analysis and processing. A generalized system is provided for automatically producing, as a function of a plura... | 04/29/1986 |
| 4575831 | Method and apparatus for acquiring seismic signals in a borehole The present invention relates to the acquisition of seismic signals at different levels in a borehole, in response to the generation of seismic waves by a source placed on the surface or in the vicinity of the surface. The acquisition is carried out by me... | 03/11/1986 |
| 4563757 | Method and apparatus for acquiring seismic signals in a borehole The present invention relates to the acquisition of seismic signals at different levels in a borehole, in response to the generation of seismic waves by a source placed on the surface or in the vicinity of the surface. The acquisition is carried out by me... | 01/07/1986 |
| 4556884 | Depth dependent multiple logging system An improved well logging technique is provided for more accurately deriving and correlating a plurality of measurements made during a single traversal of a logging instrument through subsurface formations. In one exemplary embodiment, methods and apparatu... | 12/03/1985 |
