A real-time compression method of downhole acoustic imaging logging 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: 2017-06-27
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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  • A real-time compression method of downhole acoustic imaging logging data
  • A real-time compression method of downhole acoustic imaging logging data
  • A real-time compression method of downhole acoustic imaging logging 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. like figure 1 and 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 thickness re...

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Abstract

The invention discloses a method for real-time compression of downhole acoustic wave imaging logging data. The method comprises the following steps: dividing the original downhole acoustic wave imaging logging data into multiple sets of data to be compressed, and carrying out lifting matrix-based lifting matrix compression for each set of data to be compressed. Integer discrete cosine transform, and obtain the transform domain data of each group of data to be compressed; record the first parameter, the second parameter and the third parameter of the transform domain data of each group of data to be compressed; according to the first parameter, the second The second parameter and the third parameter perform dynamic quantization processing and encoding operations on the transform domain data of each group of data to be compressed. The invention can realize real-time compression of logging data. In addition, the data transmission amount can be reduced through the invention, and the original acoustic wave imaging logging data information can be completely preserved, thereby improving the logging efficiency.

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 Patents(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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