RU-2861585-C1 - ELECTROMECHANICAL TRANSDUCER FOR ACOUSTIC COMMUNICATION CHANNEL

RU2861585C1RU 2861585 C1RU2861585 C1RU 2861585C1RU-2861585-C1

Abstract

FIELD: well logging. SUBSTANCE: invention is intended for transmitting to the surface from a well bottom geophysical and inclinometric information measured while drilling vertical, inclined and horizontal sections of the well. The essence of the invention lies in the fact that an electromechanical transducer for a hydroacoustic communication channel of a drill pipe string comprises a sub made in the form of an outer pipe installed at an arbitrary location of the drill string (near-bit module, telemetry system receiver/transmitter, repeater, etc.) and provided with a transverse force partition with through holes, rigidly connected to a protective container made in the form of an inner pipe with a front radiating plate and a piezoceramic disc pack and a rear plate arranged sequentially therein, wherein the front plate, the piezoceramic disc pack and the rear plate are interconnected, wherein, according to the invention, the piezoceramic disc pack with the plates is made in the form of a transmitter and a receiver. The transmitter transmits information via an acoustic communication channel using amplitude keying of a data packet. The data packet is modulated in the transmitter as a set of pauses and pulses. To detect and demodulate the data packet in the repeater, a template is used, with the possibility of automatic adjustment to the actual transmission conditions. The template is set in advance. The template consists of elements that correspond to one sample of the received information. During information transmission, the arrangement of pauses and pulses selected for forming the data packet is encoded. The total number of symbols in the template is selected based on the required accuracy of template adjustment, the volume and speed of calculations during demodulation. Said receiver, made in the form of a piezoceramic disc pack with plates, receives a data packet, which, by sequentially applying the template to the received data, ensures the identification of the highest total integral level of the entire data packet. The detection of the maximum value of the total integral level determines the location of the data packet in the received information. The used template allows extracting the directly transmitted data from the data packet. EFFECT: increased reliability of electromechanical communication and data transmission rate while increasing the service life of the device. 2 cl, 3 dwg

Inventors

Fedkov Evgenii Aleksandrovich
Savitskii Andrei Anatolevich
Sotenko Anton Sergeevich
MALYKH IGOR MINOVICH
Prokopev Iulii Vadimovich
Toropov Iurii Vsevolodovich

Dates

Publication Date: 20260506
Application Date: 20250811

Claims (2)

1. An electromechanical transducer for a hydroacoustic communication channel of a drill string, comprising a sub made in the form of an external pipe installed in an arbitrary place of the drill string and equipped with a transverse load-bearing partition with through holes, rigidly connected to a protective container made in the form of an internal pipe with a front radiating pad and a package of piezoceramic disks and a rear pad sequentially located therein, wherein the front pad, the package of piezoceramic disks and the rear pad are connected to each other, characterized in that the package of piezoceramic disks with pads is made in the form of an emitter and a receiver, the emitter transmits information via an acoustic communication channel using amplitude manipulation of the data packet, the data packet is modulated in the transmitter in the form of a set of pauses and pulses, and for detection and demodulation of the data packet in the repeater, a template is used, with the possibility of automatic adjustment to the actual transmission conditions, wherein the template consists of elements that correspond to one reading the received information, in the process of transmitting the information, the arrangement of pauses and pulses selected for the formation of a data packet is encoded, and the total number of symbols in the template is selected based on the required accuracy of the template adjustment, the volume and speed of calculations during demodulation, the said receiver, made in the form of a package of piezoceramic disks with overlays, receives a data packet, which, by sequentially applying the template with respect to the received data, ensures the identification of the highest common integral level of the entire data packet, and the detection of the maximum value of the common integral level determines the location of the data packet in the received information.
2. An electromechanical transducer for a hydroacoustic channel according to claim 1, characterized in that the front radiating plate and the protective container connected thereto are located in front of the front side of the partition in the direction of drilling, and the front radiating plate is located in front of the pipe of the protective container in the direction of drilling, wherein the front plate is made in the form of a thin-walled membrane of a streamlined shape, and the section of connection of the protective container with the partition is made with a reduction in the outer diameter of the pipe of the protective container and has a streamlined shape of the outer surface, wherein wires are placed in the reduced section of the partition, and the through passage holes of the partition, increased due to the reduction in the cross-section at the connection of the protective container and the partition, are made with the possibility of cavitation-free flow of drilling mud.

Description

The invention relates to the field of industrial geophysics and is intended for transmitting geophysical and inclinometric information measured during the drilling of vertical, inclined and horizontal sections of a well to the surface from the bottom of a well. A device is known for transmitting borehole information during drilling via an acoustic communication channel, comprising a sub made in the form of an external pipe installed in an arbitrary place of the drill string and provided with a transverse load-bearing partition with through passage holes, rigidly connected to a protective container made in the form of an internal pipe with a front radiating pad and a pack of piezoceramic disks and a rear pad sequentially located therein, wherein the front pad, the pack of piezoceramic disks and the rear pad are connected to each other (see patent RU No. 2276725 C2, published 20.05.2006). The device comprises a pack of piezoceramic disks with a round hole in the center, located between the front and rear cylindrical pads, and pulled together by a pin passing through said hole. A protective container having a docking unit for connecting a measuring unit is fixed to the outer surface of the front cylindrical pad. The front cylindrical plate is rigidly fixed to the internal partition of the adapter, installed perpendicular to its axis and having through holes. The disadvantage of the known device is the low power of the wave emitted into the liquid, the increased time of swinging and damping of oscillations, which limits the transmission speed, the need to increase the diameter of the flushing hole to accommodate the transmitting device and, as a consequence, a decrease in the strength of the sub body, in addition, abrasive and cavitation wear of the emitter by the flow of drilling fluid and hydrodynamic noise of the flow of drilling fluid, which creates acoustic interference, increase. The problem of the claimed invention is to increase the speed and range of transmission by increasing the power of the emitted acoustic wave, increasing operational reliability and service life, and ensuring the functioning of the communication channel in small diameter drill strings. The technical result consists in increasing the reliability of electromechanical communication and the data transfer rate with an increase in the resource of the device. The technical problem is solved and the technical result is achieved in that the electromechanical converter for the hydroacoustic communication channel of the drill pipe string contains a sub made in the form of an external pipe installed in an arbitrary place of the drill string and provided with a transverse load-bearing partition with through-holes, rigidly connected to a protective container made in the form of an internal pipe with a front radiating pad and a package of piezoceramic disks and a rear pad sequentially located therein, wherein the front pad, the package of piezoceramic disks and the rear pad are connected to each other, wherein, according to the invention, the package of piezoceramic disks with pads is made in the form of an emitter and a receiver, the emitter transmits information via the acoustic communication channel using amplitude manipulation of the data packet, the data packet is modulated in the transmitter in the form of a set of pauses and pulses, and for the detection and demodulation of the data packet in the repeater, a template is used, with the possibility of automatic adjustment to the actual transmission conditions. The template is pre-defined. The template consists of elements that correspond to one sample of the received information. During the transmission process, the locations of the pauses and pulses selected to form the data packet are encoded. The total number of symbols in the template is selected based on the required accuracy of template adjustment, volume and speed of calculations during demodulation. The said receiver, made in the form of a package of piezoceramic disks with overlays, receives a data packet which, by sequentially applying a template relative to the received data, ensures the identification of the highest common integral level of the entire data packet, and the detection of the maximum value of the common integral level determines the location of the data packet in the received information. The template used allows you to extract the transmitted data directly from the data packet. The front radiating plate and the protective container connected thereto are located in front of the front side of the partition in the drilling direction, and the front radiating plate is located in front of the protective container pipe in the drilling direction, wherein the front plate is made in the form of a thin-walled membrane of a streamlined shape, and the section of the connection of the protective container with the partition is made with a reduction in the outer diameter of the protective container pipe and has a streamlined shap