Method and circuit for data intercommunication of downhole device and ground

Abstract

The invention discloses a method and a circuit for data intercommunication of a downhole device and the ground. A power supply data bus is utilized to transmit digital signals. A sending and receiving signal selection switch ensures that only one of a sending circuit and a receiving circuit can be hung on the power supply data bus at any time so as to solve the problem that the signals can be greatly attenuated by a resistance-capacitance element in a system circuit. Two-digital binary coding is utilized to replace the existing Manchester encoding to improve the communication efficiency. According to the method and circuit, the technical scheme of the two-digit binary coding is adopted, and the carrier level amplitude can be reduced to 1 / 2 to 1 / 4 of the existing level amplitude. The method and the circuit can ensure that the attenuation amplitude of a level within the length range of 10000 M is less than 20% of the initial value of a carrier, the data can be sent continuously without extra recovery time within a certain bandwidth range, continuous code data of 180 bit or above is transmitted reliably at a long distance, and the ideal effect is achieved.

Description

technical field [0001] The invention relates to a method and a circuit for data intercommunication between downhole instruments and ground, and belongs to the technical field of data intercommunication between downhole and ground in oil fields. Background technique [0002] The data communication between the downhole instrument and the ground is usually completed by a single-core armored cable that provides power for the downhole instrument. The specific method is to load the carrier signal containing data information onto the core wire of the single-core armored cable, and the The cable completes the power supply and data transmission tasks of downhole instruments at the same time. However, the single-core armored cable is affected by parameters such as distributed capacitance and distributed resistance, and the available bandwidth of the cable is very narrow. For a long time, it has been the bottleneck that caused a large amount of logging information to be unable to be tr...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method and circuit for intercommunication between downhole instruments and ground data, so as to solve the problem of large amount of transmission information and long transmission distance and single-core armored cable The contradiction of narrow available bandwidth can not only ensure the stability of the power supply of downhole instruments, but also ensure the reliability of communication between the downhole and the ground, so as to overcome the shortcomings of the existing technology

Images