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Downhole high-speed real-time compression method of neutron logging tool while drilling based on small dictionary

A compression method and logging instrument technology, applied in wellbore/well components, measurement, earthwork drilling and production, etc., can solve problems such as difficulties in real-time data storage and transmission, limitation of downhole data transmission rate, etc., so as to facilitate dictionary recovery and guarantee The effect of compressing the code length and reducing resource loss

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

Problems solved by technology

[0005] Due to the large amount of neutron logging data 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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  • Downhole high-speed real-time compression method of neutron logging tool while drilling based on small dictionary
  • Downhole high-speed real-time compression method of neutron logging tool while drilling based on small dictionary
  • Downhole high-speed real-time compression method of neutron logging tool while drilling based on small dictionary

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Embodiment

[0030] image 3 It is a flow chart of the downhole high-speed real-time compression method of the neutron logging tool while drilling based on the small dictionary of the present invention.

[0031] In this example, if image 3 As shown, a kind of downhole high-speed real-time compression method of neutron logging tool while drilling based on small dictionary of the present invention comprises the following steps:

[0032] S1. A small dictionary in the neutron logging tool while drilling

[0033] The small dictionary needs to store historical strings, be able to compare strings, and output matching flags and matching addresses. The depth of the small dictionary is designed to be 1024, and it is actually divided into 8 small dictionaries, but in this embodiment, 8 small dictionaries with different bit widths and storage depths are constructed, as shown in Table 1;

[0034] Table 1 is a structure table of 8 small dictionaries;

[0035] dictionary number depth w...

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Abstract

The invention discloses a high-speed real-time downhole compression method of a neutron logging tool while drilling based on a small dictionary. The dictionary is initialized when the power is turned on, and then the original downhole data is cached; the compression is started after the 8-byte shift register is full. , 8-byte data is searched in 8 small dictionaries at the same time, and the matching length and matching address can be output in one clock cycle. If there are multiple dictionaries matching at the same time, select the 10bits address corresponding to the dictionary with the longest matching length as compression code output; convert the 10bits compressed code into 8bits data and then serially convert and store it in Flash; at the same time update the address of the small dictionary and write the matched character string and the next character into this address; update the shift register; and so on until Compression ends.

Description

technical field [0001] The invention belongs to the technical field of data compression, and more specifically relates to a downhole high-speed real-time compression method of a neutron logging tool while drilling based on a small dictionary. Background technique [0002] Neutron logging while drilling is a commonly used method to measure the porosity of the bottom layer. Its measurement principle is to count the hydrogen content of the bottom layer by measuring the number of thermal neutrons generated by neutron collisions. The thermal neutron energy under the influence of different source distances and depths is measured in the well, so as to determine the porosity of the bottom layer and divide the oil reservoir. The logging work can be completed in no time, avoiding the drawbacks of traditional instruments that need to log after the completion of drilling. [0003] The structure of neutron logging while drilling, such as figure 1 As shown, the downhole data acquisition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/40E21B47/12
CPCE21B47/26H03M7/40
Inventor 张伟师奕兵李焱骏高继宗杨伦陶宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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