Abstract:
An autonomous downhole power generation system includes a power generation device configured to be disposed in an annular space around a portion of a production tubing, wherein the power generation device is switchable between a power generation mode and a bypass mode. The system further includes a power storage device electrically coupled to the power generation device and configured to store power generated by the power generation device. The system also includes a control processor communicatively coupled to the power storage device and the power generation device, wherein the control processor receives a measure of power stored in the power storage device and switches the power generation device between the power generation mode and the bypass mode based on the measure of power or an preprogrammed operational protocol.
Abstract:
The present disclosure relates to generating electricity downhole using a mud-operated pulser. A disclosed example embodiment of a mud pulser system includes a piston assembly movably disposed within a housing, comprising a power piston, and configured to move in response to a pressure from a fluid flow, a control valve having an open state, in which the power piston receives the fluid flow, and a closed state, in which the power piston does not receive the fluid flow, a magnet disposed on the housing or the piston assembly, and a coil disposed on the housing or the piston assembly, wherein the magnet is configured to displace relative to the coil in response to movement of the piston assembly within the housing, such that relative movement of the magnet and the coil generates electrical energy.
Abstract:
An example drilling turbine includes a turbine power section having a turbine shaft and a plurality of turbine stages axially arranged along the turbine shaft. A turbine bearing section is coupled to the turbine power section and has a drive shaft operatively coupled to the turbine shaft such that rotation of the turbine shaft rotates the drive shaft. The turbine bearing section includes a lower mandrel that houses a portion of the drive shaft rotatable with respect to the lower mandrel, one or more magnets disposed on an inner surface of the lower mandrel, a generator coil coupled to the drive shaft and aligned with the magnets, and one or more sensors coupled to the drive shaft and in electrical communication with the generator coil. The turbine shaft rotates the drive shaft, which rotates the generator coil with respect to the magnets, and thereby generates electrical power for the sensors.
Abstract:
This system invention relates to the use of short hop communications to transfer data between 2 modules inside a well. A system deployed in a well permanently or semi-permanently collects data from downhole parameters such as pressure, temperature, vibration, flow and fluid identification and stores the information in the system memory. The receiver module is deployed in the well via slick line, electric line or coil tubing with the purpose of retrieving the data from the system memory by interfacing with the downhole module via wireless short hop communications. The receiver module can also send commands into the downhole module to change its data collection parameters. Upon completion of the data transfer, the collector is returned to the surface where the data is again wirelessly transferred to a processing system such as a Personal Computer.
Abstract:
An apparatus for generating direct current (DC) electrical energy downhole at a selected voltage includes a drill tubular, a turbine to convert drilling fluid flow energy into rotational energy, an alternator coupled to the turbine to provide AC electrical energy, and an active rectifier configured to rectify the AC electrical energy into DC electrical energy at a controllable voltage. The active rectifier includes (a) a bridge circuit having a circuit branch having first and second rectifier sets including a semiconductor switch in parallel with a diode for each phase of the AC electrical energy and (b) a feedback control loop having a micro-processor and configured to receive an output voltage measurement and a voltage measurement and/or a current measurement in at least one circuit branch as an input and to provide a control signal to each semiconductor switch in order to provide the DC electrical energy at the selected voltage.
Abstract:
A heater includes a heater housing extending along a heater axis; a fuel cell stack assembly disposed within the heater housing and having a plurality of fuel cells which convert chemical energy from a fuel into heat and electricity through a chemical reaction with an oxidizing agent; a first medium conduit fixed relative to the heater housing and in fluid communication with the fuel cell stack assembly, the first medium conduit including a first medium conduit shelf extending laterally from the first medium conduit; a second medium conduit fixed relative to the heater housing and in fluid communication with the fuel cell stack assembly, the second medium conduit including a second medium conduit shelf extending laterally from the second medium conduit; wherein the fuel cell stack assembly is supported on the first medium conduit shelf and the second medium conduit shelf.
Abstract:
A system for harvesting energy from the operation of a downhole jar is disclosed. The system converts the kinetic energy associated with the operation of the jar to electrical energy by associating the relative movement between a magnet and a coil to the relative movement between a movable member and a stationary member in the jar. Electrical energy is generated in the coil as a result of the relative motion between the magnets and the coil. This electrical energy may be stored in an electrical energy storage subsystem and provided to a downhole tool for use in the wellbore. The downhole tool may be used to power other tools, to take measurements, to communicate with other devices, to actuate other devices, and to otherwise control such other devices.
Abstract:
A method and apparatus for charging a bulk energy storage capacitor, such as used for actuating solenoids in downhole tools. An electrical generator, which may be a mud-powered, provides a rectified voltage proportional to its rotational speed. The rectified voltage is fed to a single-ended primary-inductor converter, which in turn charges the bulk capacitor 16 when the voltage across the bulk capacitor falls between predetermined upper and lower set points. Upon discharging the bulk capacitor, such as from actuation of solenoid valves for creating mud pressure pulses, control logic also causes the converter to cease charging the bulk capacitor 16 to enhance circuit efficiency and performance. A battery may also be provided to charge the bulk capacitor via a current limiter, and a disconnect circuit prevents the battery from charging the bulk capacitor when the generator is charging the bulk capacitor via the converter.
Abstract:
The present invention relates to a downhole wireline tool for performing an operation in a well at a depth of up to 15 km downhole, the tool being powered by direct current at a predetermined voltage in a first end by a power supply unit which is configured to provide a specific steady-state voltage selected from a plurality of predetermined voltages, comprising an electrical motor being powered by alternating current, a frequency converter arranged between the first end and the motor, and a voltage peak reduction unit adapted to reduce the steady-state voltage of the selected power supplied to the frequency converter from the power supply, the voltage peak reduction unit comprising a capacitor, wherein the capacitor is a high temperature capacitor having a dielectric comprising a material capable of resisting a temperature above 150° C. Furthermore, the present invention relates to a downhole tool string and to a method of protecting a frequency converter from peaks of voltage in power supplied to the frequency converter in a downhole tool according to the present invention.
Abstract:
A battery cell housing and control system enables the use of liquid battery power systems in various applications, including downhole environments. The cell housing includes a plurality of conductive terminals spaced there-around to provide conductivity between the electrochemical solution and the load. Sensors provide orientation data to the control system to thereby determine which terminals should be activated to provide power to a load.