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| Number | Title | Issue Date |
| 4968978 | Long range multiple point wireless control and monitoring system A method for remotely monitoring conditions such as carbon monoxide for methane gas concentration, longwall roof support pressure, machine parameters or uncut coal, trona or potash layer thickness in a natural resource mining system such as a longwall or ... | 11/06/1990 |
| 4945761 | Method and device for transmitting data by cable and mud waves A device and method for transferring data between a bottom of a well and a surface, wherein a transfer of data is provided either by a mud wave generator or by a cable simultaneously or successively.... | 08/07/1990 |
| 4901289 | System for acquiring and recording signals delivered by a set of sensors disposed in well probes A system is provided for acquiring and recording signals delivered by a set of sensors disposed in one or more probes lowered into a well at the end of a multi-function cable. The different signals to be transmitted are multiplexed before being applied to... | 02/13/1990 |
| 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 |
| 4808996 | Simultaneous digitizing apparatus for an acoustic tool For use in an acoustic logging tool, an apparatus which digitizes simultaneously obtained acoustic signals is set forth in the preferred and illustrated embodiment. The device cooperates with N acoustic receivers in a sonde. After an acoustic pulse is tra... | 02/28/1989 |
| 4788545 | Parameter telemetering from the bottom of a deep borehole An apparatus for measuring one or more parameters of the subsurface environment, and telemetering one or more parameters of the subsurface environment to the surface. Apparatus at the surface includes a source of intermediate frequency and voltage, electr... | 11/29/1988 |
| 4718011 | Well logging data acquisition, telemetry and control method and system A downhole microprocessor controller disposed in a well logging sonde receives and stores one or more preselected tables or series of logging tool commands down loaded from a surface computer through a logging cable telemetry link. Each tool command in a ... | 01/05/1988 |
| 4695957 | Drilling monitor with downhole torque and axial load transducers In a drilling monitor downhole transducers provide signals representative of torque (T) and axial load (F). A downhole computer apparatus (5) receives the torque and load signals and computes coefficients representative of drilling conditions. These coeff... | 09/22/1987 |
| 4684947 | Simultaneous digitizing apparatus for an acoustic tool For use in an acoustic logging tool, an apparatus which digitizes simultaneously obtained acoustic signals is set forth in the preferred and illustrated embodiment. The device cooperates with N acoustic receivers in a sonde. After an acoustic pulse is tra... | 08/04/1987 |
| 4646083 | Borehole measurement and telemetry system A measuring and telemetry system is disclosed adapted to measure the ambient pressure and temperature in a downhole environment, and to telemeter signals representative of such measurements to the wellhead for demodulation and display. Only two wires are ... | 02/24/1987 |
| 4631536 | Multiplex submersible pump telemetry system A submersible well pump has a system for monitoring parameters such as pressure and temperature in the vicinity of the motor. The system includes a downhole assembly in the well that has a transmitter for generating a carrier signal and superimposing that... | 12/23/1986 |
| 4620189 | Parameter telemetering from the bottom of a deep borehole An apparatus for measuring one or more parameters of the subsurface environment, and telemetering one or more parameters of the subsurface environment to the surface. Apparatus at the surface includes a source of intermediate frequency and voltage, electr... | 10/28/1986 |
| 4609873 | Dielectric well logging system with at least three transmitter coils and at least two receiver coils for determining resistivity and dielectric constant of a subsurface formation adjacent a fluid invaded zone of the formation A dielectric well logging system is provided to determine dielectric constant and resistivity in formations invaded by water to determine oil and water saturations of the formations. Plural transmitters are activated in a time division multiplex manner an... | 09/02/1986 |
| 4583093 | Telemetry driving circuit For use with a down hole logging system equipped with a logging cable having two wires therein, the preferred and illustrated embodiment sets forth a system which conducts electrical power and telemetry signals along a two wire logging cable. AC power is ... | 04/15/1986 |
| 4568933 | Electronic well tools and multi-channel recorder An electronic recording device and multiple sensors for measuring various parameters at locations remote from the recording device. The multiple sensors can be joined together to comprise a downhole tool for measuring various parameters within a well bore... | 02/04/1986 |
| 4568932 | Method and apparatus for obtaining high resolution subsurface geophysical measurements A subsurface geophysical parameter measurement is converted downhole to a first pulse train whose instantaneous frequency is a function of the parameter value. In response to a first control signal, a first counter begins a first count of pulses from the ... | 02/04/1986 |
| 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 |
| 4459760 | Apparatus and method to communicate information in a borehole The invention concerns efficient transmission of borehole survey signals or data from depth level in a borehole or well to the well surface, for analysis, display or recordation; further it concerns supply of DC power downwardly to the instrumentation via... | 07/17/1984 |
| 4452075 | Push drill guidance indication apparatus The present invention relates to a program controlled apparatus for providing rapid calibration and update of sensor parameters in a push drill guidance apparatus which is remotely controllable from microprocessor circuitry. A special calibration program ... | 06/05/1984 |
| 4451790 | Spontaneous potential log apparatus with randomly occurring noise cancellation In the disclosed and illustrated embodiment, an improved method and apparatus for obtaining an improved spontaneous potential log is set forth. On a single sonde, multiple spontaneous potential electrodes, aligned vertically along the length of the sonde ... | 05/29/1984 |
| 4227405 | Digital mineral logging system A digital mineral logging system acquires data from a mineral logging tool passing through a borehole and transmits the data uphole to an electronic digital signal processor. A predetermined combination of sensors, including a deviometer, is located in a ... | 10/14/1980 |
| 4181468 | Geothermal energy pump monitor and telemetric system The operation of a geothermal well power-generationsystem is monitored by sensor, communication, and performance monitoring equipment normally associated integrally with the operating power generation system. Sensors detect magnitudes of well water temper... | 01/01/1980 |
| 4107987 | Geothermal well pump performance sensing system and monitor therefor The operating characteristics of deep well pumping equipment in a geothermal well power-generation system are observed by cooperating sensor and communication elements permanently associated with the geothermal well equipment itself. Bridge circuit sensor... | 08/22/1978 |
| 4015194 | Oil well logging device having plural well fluid parameter measuring devices and a single conductor for accommodating both measurement and power signals An immersible instrumentation array for sampling the oil percentage, temperature and flow rate of well fluid comprising a plurality of circuit wafers, each including feedthrough connections, such wafers being arranged in an axial column having various ins... | 03/29/1977 |
| 3980881 | Simultaneous logging system for deep wells An improved well logging system of the type utilizing a single conductor cable to provide power from the surface equipment to a down hole subsurface unit and for simultaneously supplying current mode telemetry signals from one or more radiation detectors ... | 09/14/1976 |
| 3959767 | Data transmission system In one of the embodiments disclosed, apparatus is provided for communicating, in digital form, information from a plurality of analog sources located in a borehole to a location on the surface. A multiplexer is provided with a plurality of inputs for conn... | 05/25/1976 |
