High-speed real-time compression method of downhole density logging tool based on hash dictionary

A technology of density logging and compression method, applied in the direction of code conversion, electrical components, etc., can solve the problems of real-time data storage and transmission, and the limitation of downhole data transmission rate, so as to reduce the programming workload, reduce the consumption of resources, and solve the problem of The effect of hash collisions

Active Publication Date: 2021-07-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the large amount of logging data of the density logging tool while drilling, the downhole data transmission rate is limited, which brings difficulties to the real-time storage and transmission of data

Method used

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  • High-speed real-time compression method of downhole density logging tool based on hash dictionary
  • High-speed real-time compression method of downhole density logging tool based on hash dictionary
  • High-speed real-time compression method of downhole density logging tool based on hash dictionary

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Embodiment

[0035] image 3 It is a flow chart of the downhole high-speed real-time compression method of the density logging tool while drilling based on the hash dictionary of the present invention.

[0036] In this example, if image 3 Shown, a kind of Hash dictionary-based downhole high-speed real-time compression method of the density logging tool while drilling of the present invention comprises the following steps:

[0037] S1. Construct the hash dictionary in the density logging tool while drilling

[0038] As shown in Table 1, the storage depth table_size of the hash dictionary is designed to be 4097, and the width is 32 bits. Among them, the storage depth table_size satisfies the following conditions: table_size is an odd number and is greater than 2 to the nth power, and n is the code bit of the hash dictionary number.

[0039] The hash dictionary is used to store three parts: the current input character character, the prefix code prefix and the current code code, and its st...

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Abstract

The invention discloses a hash dictionary-based downhole high-speed real-time compression method of a density logging tool while drilling. Firstly, the original data is serial-parallel converted and sent to the FIFO cache, and then the input data is read from the FIFO after the compression process is started. , and generate the corresponding hash table address together with the prefix code, then read the content of the corresponding address of the dictionary memory, if the content is empty, output the input data, and store the corresponding prefix code, current code and dictionary item code into the dictionary ;If the content is not empty and the content matches, enter the next data; if the content is not empty but conflicts with the current data, use the hash collision function to recalculate the hash address and read and judge the data; when the dictionary is full After that, the dictionary starts to be cleared at this time, and another dictionary is selected to work at the same time, and the cycle is repeated until the compression ends.

Description

technical field [0001] The technical field of data compression processing of the present invention, more specifically, relates to a hash dictionary-based downhole high-speed real-time compression method for a density logging tool while drilling. Background technique [0002] The principle of density logging while drilling is to irradiate the formation with the gamma rays produced by the radiation of the chemical source, and the Compton effect occurs with the electrons in the material in the formation, and then use the detector to detect the gamma photons scattered after the Compud effect The energy of the gamma photon is converted by the detector into an electrical signal for subsequent processing. Due to the randomness of the gamma rays emitted by the chemical source, that is, the timing, direction and energy of the gamma rays generated by the chemical source each time have no rules to follow, and the gamma rays after the Compton scattering of the gamma rays and the formati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30
CPCH03M7/3059
Inventor 师奕兵李焱骏张伟高继宗李勃论朱宣凯肖雄
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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