A downhole digital power supply system

A digital power supply and generator technology, applied in control systems, electrical components, control generators, etc., can solve the problems of asynchronous rotor and turbine blades, unstable turbine blade rotation speed, etc.

Pending Publication Date: 2019-01-22
GUANGDONG PULUO MEASUREMENT & CONTROL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the rotor of the mud generator is rotated by the turbine blades through magnetic coupling, if the mud flow rate is unstable or the load current changes greatly, the speed of the turbine blades will be unstable, resulting in asynchronous phenomena between the rotor and the turbine blades

Method used

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  • A downhole digital power supply system

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Embodiment Construction

[0022] Such as figure 1 As shown, the downhole digital power supply includes mud generator 1, three-phase rectification module 2, signal acquisition module 3, microprocessor 4, main PWM module 5, compensation PWM module 6, freewheeling PWM module 7, main MOS tube 8, compensation MOS tube 9 , freewheeling MOS tube 10 , power resistor 11 , inductor 12 and capacitor 13 .

[0023] In this embodiment, the stator coils of the mud generator 1 are wound into three groups, so that the mud generator 1 outputs three-phase alternating current. The mud generator 1 is connected to the main MOS tube 8 through the three-phase rectification module 2, and the three-phase alternating current generated by the mud generator 1 passes through the three-phase rectification module 2 to obtain three-phase rectified power. The signal acquisition module 3, the microprocessor 4, the main PWM module 5, the main MOS tube 8 and the inductor 12 are connected in sequence, the main MOS tube 8 is connected to t...

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Abstract

The invention provides a downhole digital power supply system including a mud generator and a rectifying module connected to the output end of a mud generator. The rectifying module converts the induced alternating current generated by the mud generator into rectified current and outputs the rectified current. The rectifying module also includes a compensating fluctuation switch which conducts when the voltage amplitude of the induced alternating current output by the mud generator exceeds a preset range. A power load is connected to an output end of the rectifier module via a compensating fluctuation switch to be turned on. When the rotor and turbine blades of the mud generator are out of sync, the voltage amplitude of the induced alternating current output from the mud generator is not within the preset voltage amplitude range, At this time, that compensate fluctuation switch is turned on, so that the rectify electricity output by the rectifier module is connected into the power load, and at this time, the dynamic load of the mud generator instantaneously increases the rotational speed of the rotor is instantaneously reduced, the rotor tends to be stable, and then the turbine blades drive the rotor to increase the rotational speed through magnetic coupling, and in this process, the turbine blades and the rotor tend to be synchronous.

Description

technical field [0001] The invention relates to the field of digital power supplies, in particular to an underground digital power supply system. Background technique [0002] Measurement-while-drilling instruments are widely used in oil and gas development, and are mainly used to measure and evaluate oil and gas formations and control drilling trajectories. At present, batteries or mud generators are mainly used to power the measurement-while-drilling instruments. Due to the limited capacity of the batteries, the working time of downhole instruments is limited. At present, mud generators are usually used to supply power to the measurement-while-drilling instruments. [0003] The mud generator provides induction AC power, and then the DC conversion power supply converts the induction AC power into DC power to supply power to the measurement instrument while drilling. The specific structure of the mud generator and the specific process of providing induction AC power are as f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/10
CPCH02P9/105
Inventor 陈宇杨蔡鹏飞代春生何正松
Owner GUANGDONG PULUO MEASUREMENT & CONTROL TECH
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