TELEMETRY SYSTEM AND METHOD FOR COOLING DOWNHOLE ELECTRONICS
A telemetry system comprises a surface unit, a downhole unit and an alternative voltage source in connection through independent phase with the downhole unit.
The surface unit comprises a low-pass filter on the input of the surface unit to protect the telemetry system against overly high voltage. Also, the surface unit comprises a switch in connection with a voltage resistor configured to change the polarity of the voltage.
The downhole unit comprises a transformer, the primary winding of which includes low-pass filter configuration and the secondary winding sets an independent phase. Thermoelectric coolers are in connection through this independent phase with the alternating voltage source. The invention ensures the transmission of electricity to the thermoelectric coolers through the additional source.
The thermoelectric coolers cool electronic components, which are grouped in several groups depending on the maximum temperature limits of their utilization, so that the spread of the average of maximum temperature limits of their operation in each group is minimal. Cooled elements before installing the thermoelectric coolers may be placed on a viscous heat-conducting composition to create conditions for uniform cooling.
The downhole unit may be associated with a shaft or rotor bearings. This design can be implemented on the basis of the electrical circuit of the submersible and surface units. In this embodiment, the use of a pre-compressed inner and pre-stretched outer tubes ensures a uniform distribution of the resilient perception of pressure drops by the downhole unit associated with a shaft or rotor bearings. The use of spacers in the radial direction provides additional protection against the deformation of electronics.
According to another embodiment, the system further comprises at least one additional downhole unit connected with the downhole unit through an additional transmission line of data and energy. The additional downhole unit includes any of the well-known telemetries or multiple sensors or one sensor which performs from the minimal value of electricity that can be transmitted from the surface unit through the downhole unit. This embodiment provides an extension of the measurement zone. The downhole unit can collect and convert measurement parameters from the additional downhole unit. For convenience of mounting the downhole unit, the telemetry system may include a set of interchangeable threaded elements. The downhole unit and additional downhole unit may include sealed cable entries for installation of a conductive core and a set of deformable sealing elements configured with the possibility of radial and end sealing of the conductive core of the transmission line of data and energy under the pressure of a fluid.
The telemetry system may include a double downhole unit which duplicates its functions, both parts of which have identical design and do not communicate with each other.
In this embodiment the surface unit includes additional switches and resistors in connection through the transmission line of data and energy with the parts of the downhole unit to maintain voltage control of the downhole unit and to provide energy efficiency.
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