Acoustic logging-while-drilling device of variable-diameter sound insulation structure

A drilling sound wave and sound insulation technology, which is applied in the field of sound wave logging while drilling devices, can solve the problems of drill collar strength damage, high processing cost and high cost, and achieves the advantages of reducing processing difficulty and cost, eliminating interference and enhancing mechanical strength. Effect

Active Publication Date: 2013-11-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The cost of research and development and processing of this kind of sound insulator structure is high, coupled with its damage to the strength of the drill collar and maintena

Method used

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  • Acoustic logging-while-drilling device of variable-diameter sound insulation structure
  • Acoustic logging-while-drilling device of variable-diameter sound insulation structure
  • Acoustic logging-while-drilling device of variable-diameter sound insulation structure

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Example Embodiment

[0022] Such as figure 1 As shown, the variable-diameter sound insulation structure-while-drilling sonic logging device includes a drill collar 100. The outer side of the drill collar 100 is provided with a sonic emission device 200 and a sonic wave receiving device 300; between the sonic emission device 200 and the sonic wave receiving device 300 There is a variable-diameter sound insulation body 400 between.

[0023] The drill collar 100 from the transmitting device 200 to the receiving device 300 is as follows: the first inner diameter d 1 , The first length L 1 Drill collar 401, second inner diameter d 2 , The second length L 2 Drill collar 402, third inner diameter d 3 , The third length L 3 Drill collar 403, the fourth inner diameter d 4 , The fourth length L 4 The drill collar 404; that is, the drill collar between the transmitting device 200 and the receiving device 300 has 3 times of diameter reduction, and the length of each section of the diameter reduction structure is g...

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Abstract

The invention belongs to the field of applied geophysical exploration/acoustic logging, and particularly relates to an acoustic logging-while-drilling device of a variable-diameter sound insulation structure. The acoustic logging-while-drilling device of the variable-diameter sound insulation structure comprises drill collars, a sound wave transmitting device and a sound wave receiving device are arranged outside the drill collars, and the acoustic logging-while-drilling device is characterized in that a variable-diameter sound insulator is arranged between the sound wave transmitting device and the sound wave receiving device, and the drill collars comprise a drill collar with a first inner diameter and a first length, a drill collar with a second inner diameter and a second length, a drill collar with a third inner diameter and a third length and a drill collar with a fourth inner diameter and a fourth length from the transmitting device to the receiving device. The acoustic logging-while-drilling device lowers processing difficulty and cost, and meanwhile enhances the mechanical strength of the drill collars. Energy transfer between an energy converter and the drill collars is structurally obstructed, and the variable-diameter sound insulator is combined to further eliminate the interference of the drill collars to stratum signals.

Description

technical field [0001] The invention belongs to the field of application of geophysical exploration / acoustic logging, and in particular relates to a logging-while-drilling acoustic logging device with a variable-diameter sound-insulation structure. Background technique [0002] Compared with wireline logging, acoustic logging while drilling has the advantages of real-time measurement of formation compressional and shear wave velocities, real-time prediction of formation pressure, and little influence from mud invasion. At present, in horizontal wells, highly deviated wells and deep sea drilling, due to the high cost and high risk of wireline logging, acoustic logging while drilling has a tendency to replace wireline acoustic logging. [0003] So far, most of the sonic logging while drilling tools use a large number of grooves periodically or quasi-periodically engraved on the inside and outside of the drill collar between the transmitting and receiving transducers to attenua...

Claims

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Application Information

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IPC IPC(8): E21B47/14E21B17/16E21B49/00
Inventor 苏远大唐晓明刘西恩谭宝海李刚刘玉凯
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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