Method for packaging datagram message of measurement while drilling (WMD) system

A technology of measurement while drilling and message encapsulation, which is applied in the direction of measurement, transmission system, digital transmission system, etc. It can solve problems such as difficult to meet, low efficiency, poor adaptability to changes, etc., and achieve the effect of efficient data transmission

Inactive Publication Date: 2011-11-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of datagram has poor adaptability to the increase or decrease of downhole parameter types, value range and precision changes, as well as the change of the bit length of the real-time measured value of the parameters, and the fixed-length data field is inefficient when transmitting incremental data that changes steadily. , has been difficult to meet the needs of practical work

Method used

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  • Method for packaging datagram message of measurement while drilling (WMD) system
  • Method for packaging datagram message of measurement while drilling (WMD) system
  • Method for packaging datagram message of measurement while drilling (WMD) system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] 1. Datagram classification

[0049] 1. Data report of measurement parameters while drilling

[0050] In order to reduce the length of the MWD data report, no fixed-length data field is used, and each data field stores its real decimal data, not binary data, which is converted to binary only during compression. The format of the datagram is shown in Table 2. Table 3 is an example of a specific datagram format, and the cells with slashes indicate that this field does not exist in the actually sent datagram.

[0051] Table 2 Format of MWD parameter data report

[0052]

[0053] Table 3 Example format of MWD parameter data report

[0054] Datagram Type Identifier

Data Field Delimitation

datagram number

data field 1

data field 2

data field 3

data field 4

1

03405

0

0.2

0.03

0

0.121

[0055] (1) Datagram type identification: 1 means full datagram, 0 means incremental datagram.

[0056] ...

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Abstract

The invention provides a method for packaging a datagram message of a measurement while drilling (WMD) system, and in particular relates to a method for packaging parameters measured underground of a petroleum WMD system into datagrams. The method is mainly realized by three steps of: (1) numbering the datagrams, and determining the datagrams of special types; (2) delimiting a data field, wherein the main rule is that a value of a 'data field delimiting' field according to the length of each parameter field; and (3) classifying the datagrams, dividing the datagrams into WMD parameters, a data transmission mode and a Huffman coded datagram. The method disclosed by the invention is used for packaging the datagrams of the WMD system in oil drilling, well survey, well logging, and the like, thereby realizing a flexible, universal and efficient data transmission protocol.

Description

Technical field: [0001] The invention relates to a method for encapsulating datagram messages, in particular to a method for encapsulating parameters measured downhole by a petroleum measurement-while-drilling system into datagrams, so as to realize flexible, universal and efficient data transmission. Background technique: [0002] The information transmission technology from downhole to surface is a hot and difficult issue in the field of directional drilling and directional drilling, and it is also a technical "bottleneck" in the application and development of measurement-while-drilling systems. The information transmission method based on drilling fluid pressure has the advantages of economy, convenience, strong transmission reliability, and long transmission distance. It is currently the most mature and widely used transmission method. However, the current research mainly focuses on the design and development of the hardware equipment of the measuring instrument, focusin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56E21B47/12H04L47/43
Inventor 李忠伟王瑞和
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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