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Data transmission system in petroleum logging instrument

A data transmission system, oil logging technology, applied in surveying, wellbore/well components, earth-moving drilling, etc., can solve the problems of high chip price, increased maintenance cost, single system function, etc., to reduce instrument manufacturing and maintenance. Cost, improve data transmission speed, and the effect of high communication rate

Inactive Publication Date: 2012-08-01
北京石大华旭建邦石油科技有限公司
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AI Technical Summary

Problems solved by technology

Due to the limited production of foreign HD15530 manufacturers and the high price of this chip in China, the manufacturing and maintenance costs of current logging instruments have increased. In addition, the system using a dedicated Mann code decoding chip has single system functions, low integration, and high power consumption. , poor compatibility and other disadvantages

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  • Data transmission system in petroleum logging instrument
  • Data transmission system in petroleum logging instrument
  • Data transmission system in petroleum logging instrument

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Embodiment Construction

[0026] The circuit structure of the oil well logging instrument is divided into two parts: the uphole and the downhole. The uphole part mainly includes the ground communication system, the power supply system and the upper computer operation software. The downhole part mainly includes the data acquisition module, the downhole telemetry communication module and the power conversion module.

[0027] The data transmission of the logging tool consists of three parts: the data communication between the downhole data acquisition modules, the communication between the downhole communication module and the ground telemetry system, and the communication between the ground system and the PC. The communication solution proposed by the present invention is: a master-slave distributed measurement and control system is adopted through the CAN bus structure between the downhole telemetry board and the data acquisition board. The downhole telemetry board and the ground communication part adopt...

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Abstract

The invention discloses a data transmission system in a petroleum logging instrument. Underground acquisition boards are connected with an underground telemetering board by virtue of a CAN (Controller Area Network) bus, and the underground telemetering board is connected with a ground communication board in a transformer coupling and transmitting mode. In the data transmission system, the CAN bus communication protocol conforming to the international standard is applied to the data communication between the underground acquisition boards to ensure that the communication has the advantages of excellent error detection effect and extremely low error rate. Because of adopting a multi-master working mode, various communication modes are broadcasted and distributed, and the communication efficiency is high.

Description

technical field [0001] The invention relates to a petroleum logging instrument, in particular to a data transmission system in the petroleum logging instrument. Background technique [0002] In petroleum logging instruments, the data interaction between downhole circuits is mostly realized by RS232, RS485, and SPI communication methods. The data transmission of the above communication methods lacks a perfect communication correction mechanism, the accuracy of the transmission is not high, and the communication rate generally decreases. [0003] In the data transmission of oilfield logging cable, many kinds of instruments use Manchester code to transmit a large amount of collected information to the surface logging system. Manchester encoding is an important encoding method for serial data transmission, which has good anti-interference performance, and is usually realized by HD15530 Manchester encoding codec. Due to the limited production of foreign HD15530 manufacturers an...

Claims

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Application Information

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IPC IPC(8): E21B47/12
Inventor 武楗棠
Owner 北京石大华旭建邦石油科技有限公司
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