CN-121993179-A - Enhanced multipole receiving acoustic logging transducer and manufacturing method thereof

CN121993179ACN 121993179 ACN121993179 ACN 121993179ACN-121993179-A

Abstract

The embodiment of the application provides an enhanced multipole receiving acoustic logging transducer and a manufacturing method thereof, wherein the transducer comprises a multipole laminated piezoelectric functional unit and a glass fiber shell; the multi-pole lamination type piezoelectric functional unit is provided with a positive electrode terminal and a negative electrode terminal, and the glass fiber shell wraps the multi-pole lamination type piezoelectric functional unit and applies uniform radial compression stress to the multi-pole lamination type piezoelectric functional unit. According to the embodiment of the disclosure, the multipole laminated piezoelectric functional unit is wrapped by the glass fiber shell, uniform radial compressive stress is applied to the multipole laminated piezoelectric functional unit to counteract material expansion at high temperature, strong vibration and impact are resisted, cracking or depolarization of elements in the multipole laminated piezoelectric functional unit is avoided, the consistency and the yield of a process are remarkably improved, and the working stability and the service life of the enhanced multipole receiving acoustic logging transducer at high temperature and high pressure are improved.

Inventors

JIANG JIAHONG
YU LIANG
Fan Enzhi
LI LONG
GAO JUNHENG
TU QIJIE
JIANG JIAJIA
SUN YUNQIANG
LIU YUNFEI
ZHOU YU
FENG JIE
YUAN PENGCHENG
Xiang Jingkai

Assignees

电视电声研究所(中国电子科技集团公司第三研究所)

Dates

Publication Date: 20260508
Application Date: 20260312

Claims (10)

1. The enhanced multipole receiving acoustic logging transducer is characterized by comprising a multipole laminated piezoelectric functional unit and a glass fiber shell; the multipolar laminated piezoelectric functional unit is provided with a positive terminal and a negative terminal; the glass fiber shell wraps the multi-pole lamination type piezoelectric functional unit and applies uniform radial compressive stress to the multi-pole lamination type piezoelectric functional unit.
2. The enhanced multipole receiving acoustic logging transducer of claim 1, wherein the multipole stacked piezoelectric functional unit comprises a first metal electrode pad, a second metal electrode pad, a third metal electrode pad, a first piezoelectric ceramic, a second piezoelectric ceramic, The second metal electrode plate is arranged between the first piezoelectric ceramic and the second piezoelectric ceramic; the first metal electrode plate is arranged on one side of the first piezoelectric ceramic, which is far away from the second metal electrode plate; The third metal electrode plate is arranged on one side of the second piezoelectric ceramic, which is far away from the second metal electrode plate.
3. The enhanced multipole receiving acoustic logging transducer of claim 2 wherein the first and second piezoelectric ceramics are cuboid; the first metal electrode plate, the second metal electrode plate and the third metal electrode plate are rectangular metal sheets.
4. The enhanced multipole receiving acoustic logging transducer of claim 2, wherein the first, second, and third metallic electrode pads are the same size; The first piezoelectric ceramic and the second piezoelectric ceramic have the same size; The vertical projection of the first piezoelectric ceramic on the second piezoelectric ceramic is aligned with the boundary of the second piezoelectric ceramic; The vertical projection of the first metal electrode slice and the second metal electrode slice on the second piezoelectric ceramic is aligned with the vertical projection of the third electrode slice on the second piezoelectric ceramic; the vertical projection of the first metal electrode plate on the second piezoelectric ceramic is positioned in the boundary range of the second piezoelectric ceramic, or the vertical projection of the first metal electrode plate on the second piezoelectric ceramic is aligned with the boundary of the second piezoelectric ceramic.
5. The enhanced multipole receiving acoustic logging transducer of claim 2, wherein the first metallic electrode pad, the first piezoelectric ceramic, the second metallic electrode pad, the second piezoelectric ceramic, and the third metallic electrode pad are all secured by bonding.
6. The enhanced multipole receiving acoustic logging transducer of claim 2, wherein the first, second and third metallic electrode pads each have a terminal pin and are located on the same face of the multipole laminated piezoelectric functional unit; The wiring pins of the first metal electrode plate and the third metal electrode plate are positioned on a first side of the same surface, the wiring pin of the second metal electrode plate is positioned on a second side of the same surface, and the first side is opposite to the second side; the first metal electrode plate is connected with a wiring pin of the third metal electrode plate to form a negative terminal; the wiring pin of the second metal electrode plate forms an anode terminal; The first piezoelectric ceramic is connected with the second piezoelectric ceramic in parallel.
7. The enhanced multi-pole acoustic logging transducer of claim 1 wherein the fiberglass housing is wrapped around the multi-pole laminated piezoelectric functional unit with fiberglass and cured at a set temperature and pressure and polished.
8. The enhanced multi-pole receiving acoustic logging transducer of claim 1 wherein the vertex of the multi-pole stacked piezoelectric functional unit is a rounded corner having a set radius.
9. The enhanced multipole receiving acoustic logging transducer of claim 1 wherein the fiberglass housing is a cuboid having a flat rectangular plane.
10. A method of making an enhanced multipole receiving acoustic logging transducer according to any of claims 1 to 9, comprising: Sequentially bonding and fixing a first metal electrode plate, a first piezoelectric ceramic, a second metal electrode plate, a second piezoelectric ceramic and a third metal electrode plate to form a multi-pole laminated piezoelectric functional unit; connecting the wiring pins of the first metal electrode plate and the third metal electrode plate to form a negative terminal of the multi-pole laminated piezoelectric functional unit, and connecting the wiring pins of the second metal electrode plate to form a positive terminal of the multi-pole laminated piezoelectric functional unit; Wrapping and winding the periphery of the multipole lamination type piezoelectric functional unit by using glass fibers, wherein the glass fibers are used for applying uniform radial compressive stress to the multipole lamination type piezoelectric functional unit; And solidifying and polishing the wound glass fiber at a set temperature and a set pressure to form a glass fiber shell.

Description

Enhanced multipole receiving acoustic logging transducer and manufacturing method thereof Technical Field The application relates to the technical field of geological exploration, in particular to an enhanced multipole receiving acoustic logging transducer and a manufacturing method thereof. Background In oil and gas exploration and development, acoustic logging instruments are an important type of underground detection equipment used for measuring acoustic propagation characteristics of stratum so as to obtain key geological parameters such as longitudinal wave speed, transverse wave speed, rock porosity and elastic modulus. The basic working principle of the acoustic logging instrument is that the transmitting transducer radiates acoustic pulses to the stratum, and after the acoustic waves propagate in the well bore and surrounding stratum, the receiving transducer captures and converts the acoustic signals returned to electric signals, and the electric signals are transmitted to a surface system for processing and interpretation through a cable. The typical structure of the multipole receiving acoustic logging transducer is a type of receiving transducer commonly used in acoustic logging instruments, adopts a lamination mode that piezoelectric ceramics and metal electrode plates are alternately stacked, and converts received acoustic mechanical vibration into an electric signal by utilizing the electromechanical coupling effect of piezoelectric materials in the working process, so that the sensing of acoustic response of stratum is realized. However, during actual downhole operations, acoustic logging instruments and their internal multipole receiving acoustic logging transducers are required to operate in extremely harsh environments for long periods of time, e.g., temperatures up to 150-200 ℃ in the operating environment, pressures in excess of 100MPa, etc., with intense vibration and shock loading during drilling, tripping, or instrument movement. Under such high-temperature, high-pressure and high-impact working environments, the multipole receiving acoustic logging transducer in the related art has a remarkable structural reliability problem. In practical applications, the multipole receiving acoustic logging transducer in the related art mainly relies on a high-temperature adhesive to bond and fix the piezoelectric ceramic plate and the metal electrode plate. However, as the temperature increases, the adhesive is easy to age, embrittle and even debond, so that the interlayer bonding strength between the piezoelectric ceramic sheet and the metal electrode sheet is reduced, and the problems of piezoelectric ceramic displacement and the like are easy to occur under the action of strong vibration or impact. In addition, the piezoelectric ceramic and the metal material have the problem of unmatched thermal expansion coefficients, so that large thermal stress is easily generated in the temperature rise and drop cycle, and the piezoelectric ceramic is easily cracked or microcracked to be expanded. The problems of displacement, cracking and the like can directly lead to defects of sensitivity attenuation, signal drift, short service life and the like of the multipole receiving acoustic logging transducer, and further can directly influence the data acquisition quality of the acoustic logging instrument. Therefore, a novel multipole receiving acoustic logging transducer structure and a manufacturing process thereof are needed to ensure close adhesion among all components in the multipole receiving acoustic logging transducer, improve the mechanical performance and acoustic performance of the multipole receiving acoustic logging transducer, effectively capture weak signals at high temperature and high pressure, remarkably improve the working time of the multipole receiving acoustic logging transducer in the pit and prolong the service life of the multipole receiving acoustic logging transducer. Disclosure of Invention The embodiment of the application provides an enhanced multipole receiving acoustic logging transducer and a manufacturing method thereof, which are used for solving the problems of short service life, poor shock resistance and the like of the conventional multipole receiving acoustic logging transducer. In a first aspect, an embodiment of the present application provides an enhanced multipole receiving acoustic logging transducer, comprising a multipole laminated piezoelectric functional unit, a glass fiber housing; the multipolar laminated piezoelectric functional unit is provided with a positive terminal and a negative terminal; the glass fiber shell wraps the multi-pole lamination type piezoelectric functional unit and applies uniform radial compressive stress to the multi-pole lamination type piezoelectric functional unit. In a second aspect, an embodiment of the present application provides a method for manufacturing an enhanced multipole receiving acoustic logging transducer, which is ch