Method for real-time compression of underground sound wave imaging log data

An imaging logging and data technology, applied in electrical components, code conversion, etc., can solve the problems of large amount of acoustic wave data, limited transmission rate of downhole cables, and the inability of the highest upload rate of cables to upload acoustic imaging logging data, etc., to improve logging Well efficiency, the effect of reducing the amount of data transmission

Inactive Publication Date: 2014-06-04
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

In addition, the amount of acoustic wave data measured by the acoustic imaging logging tool during downhole operations is large, but the transmission rate of the downhole cable is limited, and the highest upload rate of the existing cable cannot upload the generated acoustic imaging logging data in real time.

Method used

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  • Method for real-time compression of underground sound wave imaging log data
  • Method for real-time compression of underground sound wave imaging log data
  • Method for real-time compression of underground sound wave imaging log data

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Embodiment Construction

[0019] Those of ordinary skill in the art will appreciate that the following detailed description of the exemplary embodiments is illustrative only and is not intended to be limiting in any way.

[0020] figure 1 Schematic diagram of the operation of the acoustic imaging logging tool, figure 2 A top view of the acoustic imaging logging tool. Such as figure 1 with figure 2 As shown, the acoustic imaging logging tool is composed of a first transducer 110, a second transducer 120, a third transducer 130 and a fourth transducer 140, wherein the first transducer 110 and the second transducer The transducer 120 is used to receive Lamb wave signals, the third transducer 130 is used to transmit and receive ultrasonic signals, and the fourth transducer 140 is used to transmit Lamb wave signals.

[0021] The third transducer 130 in the acoustic imaging logging tool emits an acoustic beam with a divergent frequency of about 400kHZ to the casing, and the casing turns into a thicknes...

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Abstract

The invention discloses a method for real-time compression of underground sound wave imaging log data. The method comprises the steps of dividing original underground sound wave imaging log data into a plurality of groups of data to be compressed, conducting lifting matrix-based integer disperse cosine transformation on each group of data to be compressed, and obtaining transform domain data of each group of data to be compressed; recording a first parameter, a second parameter and a third parameter of the transform domain data of each group of data to be compressed; conducting dynamic quantization processing and encoding operation on the transform domain data of each group of data to be compressed according to the first parameters, the second parameters and the third parameters. According to the method, real-time compression of log data can be achieved, data transmission quantity can be reduced, original sound wave imaging log data information can be saved completely, and then logging efficiency is improved.

Description

technical field [0001] The invention relates to data compression technology, in particular to a real-time compression method of downhole acoustic imaging logging data. Background technique [0002] Acoustic imaging logging belongs to the acoustic imaging logging technology and is an important means of modern logging technology. This technology uses acoustic imaging logging tools to measure the reflection of the rock or casing on the borehole wall to ultrasonic waves and Lamb waves to obtain the borehole wall Or the two-dimensional plane acoustic wave visual image of the casing wall, which reflects the acoustic properties of the well wall interface, and is not exactly the same as the optical image. In fractured formations, the distribution and position of fractures and holes in fractured formations can be known from the obtained acoustic images. In the casing, the position of the perforation in the casing and the damage of the casing can be known from the obtained acoustic i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30
Inventor 姚珺珺辛鹏来贺洪斌汪正波张铮
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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