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| Number | Title | Issue Date |
| 4596139 | Depth referencing system for a borehole gravimetry system A borehole gravimetry system employs a pair of pressure transducers for lowering into a borehole along with a borehole gravity meter. The pressure transducers are spaced apart vertically within a pressure sonde for producing a pressure differential measur... | 06/24/1986 |
| 4562556 | Compressional and shear velocity logging method apparatus Shear and compressional velocities of acoustic waveforms in the earth formations surrounding a well bore are measured by analyzing the waveforms propagated through different lengths of substantially the same formation intervals. Phase analysis techniques ... | 12/31/1985 |
| 4538248 | Recording system for a borehole logging tool A borehole logging system includes a borehole logging tool, a logging tool depth encoder for indicating rate of movement of the logging tool, a moving recording medium, and a recording encoder for indicating the actual rate of movement of the recording me... | 08/27/1985 |
| 4524324 | Downhole instrument including a flexible probe which can travel freely around bends in a borehole Bore hole instrument and methods of manufacturing and using the same. The instrument includes an elongated flexible probe which is inserted into a bore hole and can travel freely around bends of relatively short radius in the hole. The probe includes a pl... | 06/18/1985 |
| 4524435 | Method for determining the degree of change of material properties of underground strata A method of monitoring underground processes in which changes of material properties of underground strata occur in a limited area, especially in regard to in-situ combustions, gasifications in coal and petroleum deposits, in order to localize and determi... | 06/18/1985 |
| 4460986 | Method of seismic exploration using acoustic diagraphy A method of seismic exploration using acoustic logging comprises transmitting and receiving sound waves, recording all of the signals received by the receivers, the respective positions of the emitter-receiver pair which give rise to each recording, group... | 07/17/1984 |
| 4460059 | Method and system for seismic continuous bit positioning The specification discloses a method and system for determining the position of a drill bit in the earth without interrupting the drilling operations. In operation, rotation of the drill bit against the formation being drilled generates coherent acoustica... | 07/17/1984 |
| 4450540 | Swept energy source acoustic logging system An acoustic energy mode propagation speed or travel time measurement system for use in well logging is disclosed. A downhole sonde is provided with an acoustic transmitter and at least one acoustic receiver. The transmitter is repetitively driven with a u... | 05/22/1984 |
| 4419748 | Continuous wave sonic logging Apparatus and method for sonic borehole logging using a continuous wave transmitted signal. The transmitted signal is received at a plurality of points distributed along the borehole axis and sampled synchronously with the transmitted signal. The resultin... | 12/06/1983 |
| 4394754 | Apparatus for low frequency torsional shear wave logging A borehole logging device for obtaining shear wave velocities in formations adjacent the borehole, a device which utilizes a closely controlled, relatively low frequency torsional shear wave. The system includes an elongated housing for suspension within ... | 07/19/1983 |
| 4365321 | Sonic logging tool A sonic logging tool which includes a relatively short sonic wave isolation section and further includes a structural member surrounding a pressure wave generating apparatus for creating a damping shorted turns effect is disclosed. The isolation section i... | 12/21/1982 |
| 4346460 | Method and apparatus for deriving compensated measurements in a borehole A technique for producing measurements of physical characteristics of subsurface media near a borehole penetrating the earth is disclosed that uses multiple transducers positioned along a borehole tool. A number of transducers of a first type, such as tra... | 08/24/1982 |
| 4273212 | Oil and gas well kick detector Acoustic signals are propagated through the drilling fluid in a well being drilled and reflected acoustic energy from the vicinity of the bottom of the well is displayed, as well as reflections from any kicking medium so as to give advance warning of a po... | 06/16/1981 |
| 4214226 | System for plotting subsoil structure and method therefor Data for use in producing a tomograph of subsoil structure between boreholes is derived by placing spaced geophones in one borehole, and if desired also on the earth surface, and by producing a sequence of shots at spaced apart locations in the other bore... | 07/22/1980 |
| 4171031 | Well logging instrument guide apparatus A well logging instrument is attached at its first end to a well logging cable and is connected at its second end through a flex joint to a shaft section which through another flex joint is connected at its lower end to a centralizing section. As the well... | 10/16/1979 |
| 4168483 | System for detecting substructure microfractures and method therefor Bursts of signals at different frequencies are induced into substructure, adjacent a borehole. The return signals from each burst of signals are normalized to compensate for the attenuation, experienced by more distant return signals. The peak amplitudes ... | 09/18/1979 |
| 4134097 | Combination geophone-hydrophone A method and apparatus for measuring and identifying up- and down-traveling waves wherein both a velocity-sensitive and pressure-sensitive transducer are disposed at a point below the earth's surface, as for example in a borehole that is refilled. The pre... | 01/09/1979 |
| 4130816 | Circumferential acoustical detector An acoustical logging tool having a plurality of long, extendable, resilient arms, and means for remotely extending free ends of the arms into close proximity to the wall of a borehole. A cylindrical transducer is mounted on the free end of each arm, with... | 12/19/1978 |
| 4114721 | Method and system for acoustic noise logging A pair of acoustic detectors are moved through a well to detect sound at various levels within the well. Electrical signals indicative of the detected sound are applied from the acoustic detectors by way of a conductor cable to uphole recording equipment ... | 09/19/1978 |
| 4046220 | Method for distinguishing between single-phase gas and single-phase liquid leaks in well casings An acoustic detector is moved through a well to detect sound at various levels within the well. An electrical signal indicative of the detected sound is applied from the acoustic detector by way of a conductor cable to uphole recording equipment including... | 09/06/1977 |
| 4039042 | Acoustical sparker probe apparatus An acoustical sparker probe apparatus is described for generating a high energy acoustical pulse at a frequency between 600 hz and 10 khz in a borehole having a diameter between 50 mm and 100 mm. The apparatus includes an uphole electronic system having a... | 08/02/1977 |
| 4020452 | Apparatus for use in investigating earth formations In accordance with an illustrative embodiment of the present invention, there is shown a substantially rigid member having interruptions in the longitudinal continuity of the member to provide tortuous paths for the passage of acoustic energy along the me... | 04/26/1977 |
| 4012712 | System for telemetering well logging data In the particular embodiments described, a telemetering system for well logging receives and temporarily stores binary-coded parallel data in a downhole memory unit and continuously interrogates and transmits the stored data to the surface at fixed rate i... | 03/15/1977 |
| 4003017 | Continuous bit positioning system A method for determining the precise position of the drill bit, in three dimensions, in the earth during a drilling operation, with a minimum of effort and interruption to the drilling process. It provides placing a motion sensor on the drilling apparatus... | 01/11/1977 |
| 3993974 | Seismic method for determining the position of the bit on a drill stem in a deep borehole A method for determining the precise position of the drill bit on the bottom of a long drill string in a deep borehole in the earth during a drilling operation, with a minimum of effort and interruption of the drilling process. It provides placing a plura... | 11/23/1976 |
| 3991850 | Noise-attenuating positioners for acoustic well-logging tools In the representative embodiment of the new and improved apparatus disclosed herein for positioning acoustic well-logging tools, outwardly-bowed elongated spring members of a wear-resistant metal are cooperatively spaced around the body of an acoustic-log... | 11/16/1976 |
| 3982606 | Acoustical logging apparatus having signal delay means An acoustical logging apparatus which has a means for interfering with those unwanted signals which inherently travel in the mud between the transmitter and the closest receiver of said apparatus during a logging operation. The signal interference means c... | 09/28/1976 |
| 3979724 | Seismic method for determining the position of the bottom of a long pipe in a deep borehole A method and apparatus for determining the position of the bottom end of a long pipe in a deep water-filled borehole, comprising generating a shock wave in the water at the surface end of the pipe, timing the travel of the shock wave down the pipe to the ... | 09/07/1976 |
| 3974476 | Highly-directional acoustic source for use in borehole surveys A highly directional acoustic source for use in a well logging system wherein a fluid-filled tube is provided with a transducer at one end and an acoustic reflector at the other end to reflect the acoustic beam into the formation. The transducer is excite... | 08/10/1976 |
| 3961683 | Method for determining the shape of an underground cavity and the position of the surface separating two media contained therein and device for carrying out said method Method for determining the shape of an underground cavity and the location of the interface between two media contained therein by making use of a sonic sonde comprising performing, for each position of the sonde, a series of measurements of the time inte... | 06/08/1976 |
| 3952282 | Two-receiver, variable-density logging system An acoustic velocity logging tool employs a transmitter and a pair of receivers. Acoustic pulses from the transmitter pass through the formation surrounding the borehole to the receivers. The received signals, along with control signals, are transferred t... | 04/20/1976 |
