Intelligent drilling tool downhole power supply realization method and pulse driving method and circuit
A drilling tool and pulse-driven technology, which is applied to electrical components, control generators, and output power conversion devices, etc., can solve problems such as large mud flow fluctuations, poor power supply stability of downhole power systems, and insufficient driving capability of pulse signal generators. , to achieve the effect of improving stability and driving current stability
Active Publication Date: 2019-03-29
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0004] In view of this, the present invention aims to propose an intelligent drilling tool downhole power supply and pulse drive circuit to solve the problems of poor power supply stability of the downhole power supply system and insufficient drive capability of the pulse signal generator caused by large mud flow fluctuations
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[0040] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0041] The invention will be described in detail below with reference to the accompanying drawings and examples.
[0042] An intelligent drilling tool downhole power supply and pulse drive circuit, such as figure 1 As shown, it includes mud turbine generator, three-phase rectification and filter circuit, voltage stabilization circuit, probe tube, signal acquisition circuit, control circuit and drive circuit connected in sequence,
[0043] The mud turbine generator generates low-frequency three-phase AC power for powering intelligent drilling tools;
[0044] The three-phase rectification and filtering circuit performs diode full-bridge rectification and capacitor filtering on the low-frequency three-phase AC power output by the mud turbine generator, and outputs coarse DC power;
[0045]The voltage stabiliz...
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The invention creates and provides an underground power supply and pulse driving circuit of an intelligent drilling tool. The circuit comprises a mud turbine power generator, a three-phase rectification filter circuit, a voltage stabilization circuit, a probe pipe, a signal acquisition circuit, a control circuit and a driving circuit which are sequentially connected, the voltage stabilization circuit is a parallel circuit of n independent voltage stabilization power supplies, each voltage stabilization power supply comprises a loop circuit which is formed by sequentially connecting a flyback transformer, a half-wave rectification filter circuit, a feedback circuit and a pulse width modulation circuit, and the output end of the half-wave rectification filter circuit is connected with the probe pipe. The underground power supply and pulse driving circuit created by the invention has the advantages that an underground power supply and pulse driving system is designed based on a pulse width modulation technology, a flyback switching voltage stabilization power supply is used for electric energy conversion according to power utilization demand of a load to acquire stable DC electric energy output; and a pulse width modulation port of a microprocessor outputs a pulse width modulation waveform with a certain duty ratio value, and the stability of driving current of a pulse signal generator is ensured.
Description
technical field [0001] The invention belongs to the technical field of petroleum and natural gas drilling, and in particular relates to a method for realizing an intelligent drilling tool downhole power supply, a pulse driving method and a circuit. Background technique [0002] In oil drilling tools, the drilling fluid mud washes the rotor of the turbine generator, and the turbine generator generates low-frequency three-phase AC power, which is used to supply power for electrical loads such as the electronic control unit of the oil drilling tool. At the same time, the drilling fluid mud is used as the transmission medium. The pulse signal generator realizes the two-way transmission of the downhole probe measurement signal and the ground control signal by changing the cross-sectional area of the mud flow channel according to the coding requirements. However, during the drilling process, the displacement of drilling fluid and mud fluctuates greatly, resulting in large fluctu...
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IPC IPC(8): H02M7/23H02M1/32H02P9/04
CPCH02M1/32H02M7/23H02P9/04
Inventor 李绍辉魏春明汝大军王海岩马哲韩晓文魏庆振郭佳白大鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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