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Borehole ultrasonic piezoelectric transducer and borehole ultrasonic logging instrument

A technology of piezoelectric transducers and logging tools, which is applied in the direction of wellbore/well components, measurement, and fluid using vibration, etc., can solve the problems of limiting the application range and use of downhole ultrasonic imaging logging technology, and achieve high sensitivity , improve the signal-to-noise ratio, improve the effect of efficiency

Active Publication Date: 2022-06-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the ultrasonic piezoelectric transducers used for the detection and imaging of borehole shape and borehole wall characteristics in the existing wireline / logging while drilling cannot be used in the air drilling environment due to impedance mismatch, which greatly limits the downhole ultrasonic imaging The scope of application of logging technology

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  • Borehole ultrasonic piezoelectric transducer and borehole ultrasonic logging instrument
  • Borehole ultrasonic piezoelectric transducer and borehole ultrasonic logging instrument
  • Borehole ultrasonic piezoelectric transducer and borehole ultrasonic logging instrument

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Embodiment Construction

[0033] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. Also, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

[0034] figure 1 A borehole wall ultrasonic piezoelectric transducer according to an embodiment of the present invention is schematically shown, and the borehole wall ultrasonic piezoelectric transducer used for air drilling is combined with piezoelectric Materials to reduce the acoustic impedance of the vibrating wafer, and a multi-layer matching layer structure to solve the impedance mismatch between the downhole transducer and the propagation medium, making the...

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Abstract

The present invention provides a borehole ultrasonic piezoelectric transducer and a borehole ultrasonic logging instrument, wherein the borehole ultrasonic piezoelectric transducer includes a casing, and the casing is provided with a positive electrical connector and a negative electrical connector; The piezoelectric composite sheet arranged in the housing, the two ends of the piezoelectric composite sheet are respectively provided with a metal positive electrode and a metal negative electrode, the metal positive electrode is connected to the positive electrical connector, and the metal negative electrode Connect the negative electrode connector; the matching layer group arranged on the metal positive electrode side of the piezoelectric composite sheet; the backing damping block arranged on the metal negative electrode side of the piezoelectric composite sheet, the back The lining damping block absorbs the ultrasonic energy radiated backward by the piezoelectric composite sheet. The borehole ultrasonic logging tool includes the borehole ultrasonic piezoelectric transducer. The invention reduces the acoustic impedance of the vibrating chip by the piezoelectric composite material, and solves the impedance mismatch between the downhole transducer and the propagation medium with a multi-layer matching layer structure.

Description

technical field [0001] The invention relates to a borehole wall ultrasonic piezoelectric transducer and a borehole wall ultrasonic logging instrument, belonging to the field of air drilling. Background technique [0002] Air drilling is an underbalanced drilling technology that uses compressed air as a circulating medium. It has many advantages such as high ROP, short well construction period, reduction or avoidance of formation leakage and reservoir damage. It is the most potential drilling in the 21st century. one of the technologies. In recent years, domestic air drilling technology has developed rapidly. For example, more than ten wells of air hammer gas drilling have been carried out in western oilfields in my country, with a cumulative footage of more than 10,000 meters. However, in the process of high-efficiency rock-breaking drilling, air drilling has brought complicated situations such as serious irregularity of wellbore cross-section, increased wellbore roughness,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B06B1/06E21B47/14E21B47/01
CPCB06B1/06E21B47/14
Inventor 吴金平郑俊华闫立鹏倪卫宁张卫吴海燕郑奕挺
Owner CHINA PETROLEUM & CHEM CORP
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