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Shock absorption and noise reduction structure for sonic logging tool

A logging instrument and sonic technology, applied in the field of shock absorption and noise reduction structures, can solve the problems of sonic logging noise interference and the like

Inactive Publication Date: 2014-12-24
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

By analyzing the source of noise and summarizing in logging practice, it is possible to design an acoustic instrument specifically for horizontal well logging. By adding noise-reducing rubber rings or changing the sound system structure of traditional sound-insulating grooves, the noise between the instrument and the well can be reduced or eliminated. Wall friction can fundamentally solve the noise interference problem of acoustic logging

Method used

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  • Shock absorption and noise reduction structure for sonic logging tool
  • Shock absorption and noise reduction structure for sonic logging tool
  • Shock absorption and noise reduction structure for sonic logging tool

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Embodiment Construction

[0036] The embodiments of the present invention will now be described more fully with reference to the accompanying drawings. The following description is merely exemplary in nature, and does not limit the present invention and its application or use.

[0037] The present invention will now be further described with reference to the drawings. reference Figure 4 , Which is the instrument housing. It can be seen that the outer diameter of the sound system of conventional acoustic wave instruments is the same as that of other instruments. The file-shaped sound insulation groove is designed to attenuate direct waves. In horizontal well logging, the friction with the borehole wall produces noise. Main source. The direct wave here refers to the sound wave emitted by the transmitting transducer, which is directly transmitted to the receiver along the sound system housing and generated by the sound wave signal. When manufacturing sonic logging tools, it is required that the direct wa...

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Abstract

The invention relates to a shock absorption and noise reduction structure for a sonic logging tool, in particular to the shock absorption and noise reduction structure for the sonic logging tool. The sonic logging tool is provided with a shell. The shell is provided with one or more sound insulation grooves and a receiver acoustic window. The sound insulation grooves are used for attenuating direct waves. The receiver acoustic window is used for receiving sound. A rubber layer wraps the sonic logging tool and used for reducing and attenuating friction noise. The rubber layer has different shapes and sizes according to the different sound insulation grooves.

Description

Technical field [0001] The invention relates to a vibration reduction and noise reduction structure used for acoustic logging instruments. Background technique [0002] In the process of oil and gas field exploration and development, sonic logging is one of the important methods to obtain geological data. In vertical well logging, the quality rate of the acoustic curve can reach more than 90% under the conditions of the required speed measurement and centralizer. However, with the deepening of oilfield exploration and development and the continuous improvement of drilling technology, the proportion of highly deviated wells and horizontal wells in most domestic oilfields has gradually increased, and the proportion of horizontal wells in some oilfields has reached more than 70%. [0003] Compared with vertical well logging, horizontal well logging operations are much more difficult, and the factors that affect the quality of logging curves are more complex. In a horizontal well, du...

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Application Information

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IPC IPC(8): E21B47/14
Inventor 冯杰鲍雪山肖加奇陶钧潘良根
Owner CNPC GREATWALL DRILLING ENG
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