Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Near-bit wireless short pass constant current sending method and device

A constant current technology close to the drill bit, which is applied in the direction of earthwork drilling, measurement, borehole/well components, etc., can solve the problems of not using constant current emission technology, achieve great practical value, ensure stable power consumption, and avoid emission power consumption effect

Active Publication Date: 2019-12-31
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the method of wireless short transmission near the drill bit by using the electrode method, there is no constant current transmission technology at present.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Near-bit wireless short pass constant current sending method and device
  • Near-bit wireless short pass constant current sending method and device
  • Near-bit wireless short pass constant current sending method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] In the system that has been implemented so far, the power supply voltage is 11V, and the transmit processor part sets the maximum transmit current to 500mA. The system sets the collector voltage loaded to the PMOS through the DAC (analog-to-digital converter output port) of the processor part to 10V. . The power resistor is selected as Rs=2Ω, so if RL is less than 22 ohms, the maximum current loaded by the system to the H-bridge high-voltage terminal is 500mA ((11V-10V) / 2Ω). Since the discharge circuit current is 500mA, the power consumption loaded on the Rs power resistor is 0.5*0.5*2=0.5W, so Rs needs to use a high-power resistor to adapt to the situation where the current is above 500mA.

Embodiment 2

[0077] A higher emission current can be obtained by modifying the current system. The power supply voltage is 22V. The emission processor part sets the emission current to a maximum of 2A. The system is loaded to The collector voltage of the PMOS is 18V. The power resistor is selected as Rs=2Ω, so if RL is less than 11 ohms, the maximum current loaded by the system to the H-bridge high-voltage terminal is 2A ((22V-18V) / 2Ω). Since the discharge circuit current is 2A, the power consumption loaded on the Rs power resistor is 2*2*2=8W, so Rs needs to use a high-power resistor to adapt to the situation where the current is above 2A.

Embodiment 3

[0079] In the case of drilling with high resistivity, the power supply voltage is 11V, and the emission processor part sets the maximum emission current to 0.5A. The system loads the PMOS through the DAC (analog-to-digital converter output port) setting of the processor part. The collector voltage is 10V. The power resistor is selected as Rs=2Ω, so if RL is less than 22 ohms, the maximum current loaded by the system to the high voltage end of the H bridge is 2A ((22V-18V) / 2Ω). However, if the current equivalent resistance R at both ends of the emitter electrode is large, and the total load RL of the discharge circuit is greater than 22 ohms, then the discharge circuit works at a current of 11V / RL, and the current of the circuit at this time is less than 500mA.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a near-bit wireless constant current close short-distance transmission method and device and belongs to the technical field of near-bit well logging during drilling. The near-bit wireless constant current close short-distance transmission device comprises a transmitting part and a receiving part. After modulation treatment, a signal is sent to the receiving part through thetransmitting part in a wireless short pass mode. The transmitting part transmits the transmitting signal into the stratum according to the set rated transmitting constant current value, the rated transmitting constant current value of the transmitting signal is dynamically monitored and adjusted, and stable transmitting power is obtained. The near-bit wireless constant current close short-distance transmission method and device are provided, the transmitting power consumption problem under different-electrical-resistivity stratum conditions in the drilling-following process is avoided, the structure is simple, achieving is easy, and circuit damage caused by tool high transmitting power consumption can be avoided effectively.

Description

technical field [0001] The invention belongs to the technical field of logging-while-drilling near a drill bit, and in particular relates to a near-drill bit wireless short-pass constant current transmitting method and device. Background technique [0002] At this stage, near-bit logging while drilling technology is developing rapidly. Compared with conventional logging while drilling, the sensor probe of near-bit logging tools is closer to the drill bit, which can obtain drilling formation information in a timely manner and more accurately mark drilling trajectories. Reduce drilling operation risk and improve operation efficiency. Generally speaking, the near-bit LWD instrument consists of the following three parts: near-bit measurement pup, near-bit short-distance transmission device, and measurement-while-drilling system (MWD), such as figure 1 shown. Among them, the near-bit measurement sub-section is arranged close to the drill bit, and accelerometers, magnetic sensor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/13E21B47/18
CPCE21B47/18E21B47/13E21B47/013
Inventor 孙云涛陈文轩底青云郑健张文秀
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com