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Time synchronization method for downhole instrument

A technology of time synchronization and synchronous messages, which is applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve the problems of large time error, low precision, and inaccurate time, and achieve the effect of reducing the degree of coupling

Inactive Publication Date: 2012-08-22
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] 1. Each logging equipment is related to the ground control equipment, and the whole system is highly coupled. Adding any new logging equipment requires changing the source code of the ground control equipment
[0005] 2. The time is not accurate
The time stamp of each logging equipment data is related to the clock beat and the processing delay of the ground control equipment, the time error is large and the accuracy is low

Method used

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  • Time synchronization method for downhole instrument
  • Time synchronization method for downhole instrument
  • Time synchronization method for downhole instrument

Examples

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example

[0056] According to an example of the present invention, the logging system may include a plurality of logging devices distributed downhole and control devices on the ground, each logging device includes respective sensors, clocks, amplifiers, A / D converters and Microprocessor etc. The logging equipment is connected through a wired or wireless network. The logging equipment is also wired or wirelessly connected to surface control equipment. The analog signal detected by the sensor is locally converted into a digital signal, and then transmitted to the control device after being superimposed with clock encoding. The control equipment controls and manages each logging equipment and monitors the work of the whole system.

[0057] One of the logging devices can be selected as the master device, and the other logging devices as slave devices. The master and slave devices are synchronized according to the above-mentioned protocol in active mode or server-client mode.

[0058] ...

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Abstract

The invention discloses a data transmission method used for multiple well logging devices and a control device, wherein the multiple well logging devices comprises a first well logging device and a second well logging device. The method comprises the following steps: the first well logging device obtains reference time; the first well logging device sends a time synchronization message; the second well logging device receives the time synchronization message; the second well logging device modifies local time; the first well logging device and the second well logging device print a timestamp for well logging data; and the first well logging device and the second well logging device convey the well logging data to the control device.

Description

technical field [0001] The invention relates to a time synchronization method for downhole instruments. Background technique [0002] Well logging, also known as geophysical well logging or petroleum well logging, referred to as well logging, is a method of measuring geophysical parameters using the electrochemical properties, electrical conductivity, acoustic properties, radioactivity and other geophysical properties of rock formations, which belongs to applied geophysical methods (Including gravity, magnetic, electric, seismic, logging). Generally, it can be divided into electrical logging, sonic logging, radioactive logging, formation dip logging, gas logging, formation testing logging, gas drilling logging, etc. according to the detected rock physical properties or detection purposes. All kinds of well logging equipment manufactured by using the physical principles of electricity, magnetism, sound, heat, and nuclear are lowered into the well by the logging cable, so tha...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04L29/06
Inventor 岳宏图陈文轩周正志裴彬彬郭玉庆戴光明
Owner CNPC GREATWALL DRILLING ENG
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