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Electrode type near-bit wireless short transmission modulation method and device thereof

A modulation method and near-bit technology, applied in transmission systems, electrical components, earth-moving drilling, etc., can solve the problems of short transmission distance, poor anti-interference ability, etc., and achieve a simple implementation method, increase battery life, and flexible configuration. Effect

Inactive Publication Date: 2020-09-08
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as high-speed serial communication, SPI communication, etc., the advantage is that the transmission rate is fast, but the transmission distance is short and the anti-interference ability is poor

Method used

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  • Electrode type near-bit wireless short transmission modulation method and device thereof
  • Electrode type near-bit wireless short transmission modulation method and device thereof
  • Electrode type near-bit wireless short transmission modulation method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] During on-site operations, ground drilling engineers need to obtain the attitude of the drill bit (well deviation, azimuth), drilling speed, upper and lower gamma and temperature of the drill bit in real time. According to this requirement, before the near-bit tool goes downhole, configure the transmission data packet structure as follows: Figure 5 shown.

[0054] Among them, the upper and lower gammas are imaged according to the magnetic tool face angle and the gravitational tool face comparison. The range is 0 to 255. Well deviation occupies two bytes, divided into high byte H and low byte L. The precision is 0.3°, and the actual effective 12bit. Azimuth, number of revolutions, and temperature each occupy 1 byte. Encode in a specific way. The total number of transmitted bits is 80 bytes, the transmission time is 80*20ms=1.6s, and the transmitting end sends once every 20 seconds. Consider the power consumption: according to different formation environments, if t...

Embodiment 2

[0056] During on-site operations, in order to simplify the operation process, ground drilling engineers sometimes ignore other drilling parameters, and only need the upper and lower gamma and well deviation information. At this time, before the near-bit tool goes downhole, the transmission data packet structure can be configured as follows: Figure 6 shown.

[0057] At this time, the total number of transmitted bits is 56 bytes, the transmission time is 56*20ms=1.12s, and the transmitting end sends once every 20 seconds. Then the transmitting end can work continuously for T=Wc / (Wt*1.12 / 20).

Embodiment 3

[0059] During the on-site operation, the number of transmitted bits can be increased arbitrarily, but with the increase of the number of transmitted bits, under the condition of constant battery power consumption, the more transmitted bits, the shorter the corresponding working time, which is proportionally shortened.

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Abstract

The invention discloses an electrode type near-bit wireless short transmission modulation method and device, and belongs to the technical field of near-bit logging while drilling. The method comprisesthe steps that parameters are measured through a near-bit measuring nipple, and parameter information is obtained and packaged into a data packet to be sent to a transmitting processor part; binary frequency shift keying modulation is carried out on the data packet through the transmitting processor part; according to set transmitting power and driving source power, a modulated data packet is loaded to an emitter positive electrode and an emitter negative electrode after passing through an amplifying circuit and a driving circuit, and the modulated data packet passing through the amplifying circuit and the driving circuit is transmitted to a receiver through the emitter positive electrode and the emitter negative electrode, so that electrode type wireless short transmission modulation isrealized. According to the invention, modulation emission of any length of near-bit wireless short transmission can be realized. The implementation method is simple, information needing to be transmitted can be flexibly configured before well descending according to the requirements of an actual drilling site, field operation personnel can use the method conveniently, operation efficiency is improved, and drilling risks are reduced.

Description

technical field [0001] The invention belongs to the technical field of near-drill bit logging while drilling, and in particular relates to an electrode-type near-drill wireless short transmission modulation method and device. Background technique [0002] The electrode-type near-bit wireless short transmission is mainly used to transmit the measurement data near the drill bit to the MWD (Measure While Drilling) system wirelessly across the screw rod during the logging-while-drilling process. The data is transmitted to the ground system through the mud wave pulse generator of the MWD system or electromagnetic wave technology, so as to guide the drilling operators to judge the formation conditions and drilling attitude of the current drill bit accessories. [0003] Such as figure 1 As shown, the near-drill wireless short transmission device is composed of a transmitter and a receiver. The transmitter is electrically and mechanically connected to the near-drill measuring sub. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/12H04L1/00G08C17/02E21B47/18E21B47/12
CPCH04L27/12G08C17/02H04L1/0061E21B47/18E21B47/13E21B47/013E21B47/125E21B47/20
Inventor 孙云涛陈文轩底青云郑健张文秀
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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