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Communication method and communication circuit between downhole instrument and ground control system

A downhole instrument and ground control technology, which is applied in general control systems, control/adjustment systems, instruments, etc., can solve the problems of poor reliability, short life and high maintenance cost of communication circuits, and improve the real-time performance and reliability of communication. Effects of improving reliability and simplifying circuit design

Pending Publication Date: 2018-09-28
贵州航天控制技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a communication method and a communication circuit between the downhole instrument and the ground control system to solve the problems of poor reliability, short life and high maintenance cost of the communication circuit in the harsh working environment of the downhole, thereby overcoming Insufficiency of existing technology

Method used

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  • Communication method and communication circuit between downhole instrument and ground control system
  • Communication method and communication circuit between downhole instrument and ground control system
  • Communication method and communication circuit between downhole instrument and ground control system

Examples

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Embodiment

[0025] The communication circuit in this example is mainly responsible for receiving commands or data conforming to the Manchester II encoding format from the main bus connected to the ground control system, converting commands into parallel data that can be directly read by the signal processing circuit, and then processing the signal processing circuit The sent parallel data is converted into commands or data in Manchester II encoding format and sent to the ground control system and downhole instruments.

[0026] The communication circuit in this example is as figure 1 As shown, it is mainly composed of polarity isolation transformer, polarity conversion circuit, encoder / decoder, gate circuit, signal processing circuit, signal drive circuit, drive isolation transformer and clock circuit. The communication circuit works in remote (RT) mode.

[0027] The clock circuit in this example uses a 4M clock source, which is divided into two clocks of 250k and 500K by a 12-bit asynchr...

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Abstract

The invention discloses a communication method and communication circuit between a downhole instrument and a ground control system. The downhole instrument and well equipment are connected through a main bus, the downhole instrument and the well equipment adopt a Manchester II coding format to communicate; the downhole instrument receives a command or data meeting the Manchester II coding format on the main bus through a polar isolation transformer, a signal processing circuit directly reads the command or data, the parallel data processed by the signal processing circuit is converted into thecommand or data meeting the Manchester II coding format through a coder / decoder so as to be sent to a signal driving signal; and the command or data is sent to the ground control system by a drive isolation transformer through the main bus. The use of an address latch, a shift register, a trigger and a large number of discrete devices in the prior art is omitted, the power consumption and the heat dissipation of the communication circuit are reduced, the work burden and the hardware cost expenditure of a constant temperature system are effectively reduced, and the method has the features of being reliable in communication and stable in transmission.

Description

technical field [0001] The invention relates to a communication method and a communication circuit between a downhole instrument and a ground control system, and belongs to the technical field of oil well communication. Background technique [0002] With the deepening of crude oil extraction and the improvement of oil recovery efficiency, it is necessary to accurately and comprehensively understand its own conditions and changes in surrounding geological conditions from the drilling of oil wells to the entire life of use, so as to formulate corresponding exploitation plans. During oil well measurement, the connection between downhole instruments and uphole equipment is usually connected through communication circuits. [0003] At present, imported communication electrical equipment is a Manchester communication circuit built by discrete components such as address latches, shift registers, and flip-flops. The digital signal processing chip accesses the communication interface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L1/00G05B19/042E21B47/12
CPCH04L1/0023H04L1/0056H04L12/40H04L12/40013H04L12/40182G05B19/042H04L2012/40215H04L2012/40221G05B2219/25032E21B47/12
Inventor 张先全郭俊超
Owner 贵州航天控制技术有限公司
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