Full-duplex communication method based on single-core electric cables

A communication method and single-core cable technology, applied in the field of communication, can solve the problems of long instrument connectors, complex structures, and many connection points, and achieve the effects of simple connection, low error rate, and simple structure

Inactive Publication Date: 2012-06-20
XIAN SITAN INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The connection between downhole instruments should be simple and reliable. If the downhole instruments are connected by multi-core joints, there will be many connection points, complex structures, and long instrument joints.

Method used

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  • Full-duplex communication method based on single-core electric cables
  • Full-duplex communication method based on single-core electric cables
  • Full-duplex communication method based on single-core electric cables

Examples

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Embodiment Construction

[0037] The present invention provides a method of communication between the logging instrument and the ground numerical control and the logging instrument, the method includes the following steps:

[0038] 1) Commands that need to be sent to downhole tools for surface NC construction:

[0039] 2) The ground numerical control couples the already constructed commands that need to be sent to the downhole tool to the cable and sends it to the downhole tool through the cable:

[0040] 2.1) The surface numerical control converts the already constructed commands that need to be sent to downhole instruments into low-frequency sine wave signals; the commands that need to be sent to downhole instruments are low-frequency TTL level signals;

[0041] Such as figure 1 As shown, the command to be issued enters the circuit from the RX terminal. After a differential, fourth-order low-pass and reverse amplification, the TTL level signal sent by the computer is converted into a sinusoidal sign...

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PUM

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Abstract

The invention relates to a full-duplex communication method based on single-core electric cables, which includes the following steps of 1), establishing commands needed to be sent to an underwell instrument by ground numerical control; 2) coupling the established commands needed to be sent to the underwell instrument to electric cables by the ground numerical control and sending the commands to the underwell instrument through the electric cables; 3) establishing data needed to be sent to the ground numerical control after the underwell instrument receives the commands sent from the ground numerical control; and 4) coupling the established data needed to be sent to the ground numerical control to the electric cables in a positive and negative pulse manner and sending the same to the ground numerical control through the electric cables after direct current is cut off through a high-overpressure resistance capacitor. The full-duplex communication method based on the single-core electric cables is low in error rate during data transmission to the underwell instrument and capable of transmitting ground low-frequency commands and high-frequency data of the underwell instrument simultaneously and controlling the underwell instrument on the ground in real time.

Description

technical field [0001] The invention belongs to the communication field, and relates to a data interaction method, in particular to a single-core cable-based full-duplex communication method for downhole instruments to be connected to each other with numerical control on the ground and for communication between instruments. Background technique [0002] In terms of well logging technology, imaging logging technology can measure oil wells in all directions and from multiple angles, which can intuitively understand the downhole conditions and bring great convenience to well logging interpretation. However, image logging needs to transmit a large amount of data, which brings great inconvenience to data transmission. Some simple instruments can work by directly powering on or adjusting the voltage, while some complex instruments need to control the downhole instruments through the ground to ensure that the downhole instruments work in a predetermined state. [0003] In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/14
Inventor 孙国鼎李晓东胡森强陈亮
Owner XIAN SITAN INSTR
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