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| Number | Title | Issue Date |
| 7312720 | Multi-loop transmission system A transmission system between a voltage source and a wireline tool comprising a first loop to transmit a signal between the voltage source and the wireline tool. The first loop has a first transformer coupled to the voltage source. The system also comprises a second... | 12/25/2007 |
| 7158049 | Wireless communication circuit The invention includes a wireless communication circuit and a method of communicating with wireless signals that feature a tank circuit having an inductor connected in parallel with a capacitor circuit. The capacitor circuit includes a pair of capacitors coupled in ... | 01/02/2007 |
| 7154412 | High-power well logging method and apparatus A power delivery system for a wireline tool includes two independent power transmission loops operating on a standard six-conductor cable. The two loops each connect directly to a respective terminals of a DC auxiliary power supply. Each loop also couples through a ... | 12/26/2006 |
| 7009312 | Versatile modular programmable power system for wireline logging A method and system for providing power to a wireline logging system includes a rectifier section operable to receive an AC input signal and generate a first DC power signal as an output. A converter section cascadedly coupled to the rectifier section converts the f... | 03/07/2006 |
| 6851481 | Electro-hydraulically pressurized downhole valve actuator and method of use A petroleum well having a communication system and a hydraulic system is provided. The petroleum well includes a borehole and a piping structure positioned within the borehole. The communication system supplies a time varying electric current downhole along the pipi... | 02/08/2005 |
| 6396415 | Method and system of communicating in a subterranean well Communicating relative to a subterranean well includes encoding information in an amplitude and a duration for a pulse. A detectable change in response to both the amplitude and duration communicates the information. Two distinct items of information can ... | 05/28/2002 |
| 5670931 | Method and apparatus for transmitting data over a power cable utilizing a magnetically saturable core reactor The present invention impresses the data on the power signal by utilizing a saturable core reactor. The saturable core reactor uses two cores. Each core has both load windings and control windings. The control windings are selectively energized to alter a... | 09/23/1997 |
| 5539375 | Apparatus for transmitting instrumentation signals over power conductors A downhole instrumentation system comprises one or more transducers coupled in a DC current circuit between the star point of an electrical submersible pump and the chassis. A sensing circuit including a DC power supply and an ammeter is arranged to monit... | 07/23/1996 |
| 5448227 | Method of and apparatus for making near-bit measurements while drilling In accordance with illustrative embodiments of the present invention, a measuring-while-drilling system includes a sensor sub positioned at the lower end of a downhole motor assembly so that the sub is located near the drill bit. The sub houses instrument... | 09/05/1995 |
| 4901070 | Pressure monitoring system with isolating means An electric submersible pump system has a pressure monitoring device for monitoring the pressure down the hole. The pressure monitoring device has a pressure transducer whose resistance varies with the pressure. The pressure transducer is connected to gro... | 02/13/1990 |
| 4876539 | 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... | 10/24/1989 |
| 4864293 | Inground boring technique including real time transducer A system in which a boring tool is urged through the ground by means of a drill string in order to form an underground hole is disclosed herein along with an arrangement for obtaining certain information at the boring tool during operation of the boring t... | 09/05/1989 |
| 4826577 | Control system for electrochemical protection on submersible metal structures A method and device for automatic surveillance of electrochemical protection on submersible metal structures. The difference in electric potential between the steel structure and at least one electrode, in contact with the ambient water, is detected with ... | 05/02/1989 |
| 4821035 | Method and apparatus using a well casing for transmitting data up a well A tool with a switch is inserted and moved down the inside of tubular-shaped and electrically conductive casing in the well. Spaced apart contacts on the tool are connected between upper and lower electrically conductive casings located on opposite sides ... | 04/11/1989 |
| 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 |
| 4724434 | Method and apparatus using casing for combined transmission of data up a well and fluid flow in a geological formation in the well The method uses a tubular shaped and electrically conductive well casing that extends to a geological formation in an oil or gas well. The casing is used for both flowing fluid between the formation and the casing at the top of the well and for communicat... | 02/09/1988 |
| 4631535 | Submersible pump pressure detection circuit A device for measuring pressure in a submersible well pump motor has features to eliminate the effect of extraneous DC in the ground path. A potentiometer located downhole has a resistor engaged by a wiper which moves along the resistor in response to pre... | 12/23/1986 |
| 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 |
| 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 |
| 4581613 | Submersible pump telemetry system A submersible well pump has a system for monitoring the 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 signal and superimposing the signal onto the power c... | 04/08/1986 |
| 4578675 | Apparatus and method for logging wells while drilling An information while drilling apparatus and method for characterizing strata in the vicinity of a drill bit at the lower end of a drill string, including a down-hole module unit and surface receiving and control units. Excitation currents are caused to pa... | 03/25/1986 |
| 4523194 | Remotely operated downhole switching apparatus A remotely operated downhole switching apparatus, particularly adapted to selectively connect a downhole device such as a sensor circuit to a cable which supplies power to a downhole motor includes a switch for connecting the downhole device to a neutral ... | 06/11/1985 |
| 4178579 | Remote instrumentation apparatus A self-referencing sensing and control apparatus which may be used advantageously in any industrial installation in which an A.C. powered device, such as the down-hole motor in a submersible pumping system or a plunger relay, is remotely located and in wh... | 12/11/1979 |
| 4157535 | Down hole pressure/temperature gage connect/disconnect method and apparatus A method and an apparatus for connecting a gage to an oil well pump power cable for transmitting pressure and temperature data to a surface recorder whereby the gage can be selectively disconnected when it is desired to test the insulation integrity of th... | 06/05/1979 |
| 3938129 | Power line data transmission system A power line data transmission system is disclosed in which data is transmitted over a line carrying alternating current power by varying or modulating the power factor of the line or the phase angle of the power on the line in accordance with a signal to... | 02/10/1976 |
