# US 11,910,144 B2 · High temperature high pressure acoustic sensor design and packaging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,910,144 B2 - Document ID: US11910144B2 - Status: Granted - Kind: B2 - Application number: 17/871,043 - Filed: 2022-07-22 - Published: 2023-01-26 - Granted: 2024-02-20 - Earliest claimed: 2021-07-22 - Assignees: Baker Hughes Oilfield Operations LLC - Applicants: Necmi Unsal; Tobias Colista - Inventors: Necmi Unsal; Tobias Colista - Web page: https://patentgrep.com/patent/US11910144B2 ## CPC - H04R 1/083: {Special constructions of mouthpieces} - H04R 1/04: Structural association of microphone with electric circuitry therefor (in electric hearing aids H04R25/00) - H04R 1/2876: {by means of damping material, e.g. as cladding (damping material for tuning desired resonances H04R1/2807, e.g. in vents H04R1/2823, H04R1/2846)} - H04R 1/44: Special adaptations for subaqueous use, e.g. for hydrophone - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A system including a work string and an acoustic device for sensing or transmitting an acoustic signal at least partially traveling through a borehole fluid within a wellbore and a method of operation. The acoustic device includes a compensation fluid, an acoustic transducer at least partially disposed in the compensation fluid and configured to sense the acoustic signal, and a metallic cover that separates the compensation fluid from the borehole fluid and configured to deform in response to a pressure difference between the borehole fluid and the compensation fluid. The acoustic device is conveyed into the wellbore and an electric signal is sent or received with the processor to or from the acoustic transducer. ## Claims ### Claim 1 An acoustic device for sensing or transmitting an acoustic signal at least partially traveling through a borehole fluid within a wellbore, the acoustic device comprising: a compensation fluid; an acoustic transducer at least partially disposed in the compensation fluid and configured to sense the acoustic signal; and a metallic cover that separates the compensation fluid from the borehole fluid and configured to deform in response to a pressure difference between the borehole fluid and the compensation fluid, wherein the pressure difference is created by the acoustic signal and a hydrostatic pressure in the borehole fluid. ### Claim 2 (depends on 1) The acoustic device of claim 1, wherein the metallic cover is substantially circular. ### Claim 3 (depends on 1) The acoustic device of claim 1, wherein the compensation fluid is disposed within a housing and the metallic cover is welded to the housing. ### Claim 4 (depends on 3) The acoustic device of claim 3, wherein the housing includes a pressure feed-through comprising at least one electrical connection. ### Claim 5 (depends on 3) The acoustic device of claim 3, further comprising an insulating material between the acoustic transducer and the housing configured to provide at least one of an electrical insulation, an acoustic insulation, and a damping of mechanical shock or vibration. ### Claim 6 (depends on 5) The acoustic device of claim 5, wherein the insulating material comprises rubber. ### Claim 7 (depends on 5) The acoustic device of claim 5, wherein the insulating material comprises two or more layers. ### Claim 8 (depends on 1) The acoustic device of claim 1, wherein the metallic cover has one or more corrugations. ### Claim 9 (depends on 1) The acoustic device of claim 1, wherein the acoustic transducer has an inner surface that is radially inward with respect to an axis of the acoustic device and a terminal for electrical connection extending from the inner surface. ### Claim 10 (depends on 1) The acoustic device of claim 1, wherein the acoustic device is operable at a hydrostatic pressure of up to 30 kpsi and a temperature of up to 175° C. ### Claim 11 (depends on 1) A system for use in a wellbore comprising a work string and the acoustic device of claim 1. ### Claim 12 A method for sensing or transmitting an acoustic signal at least partially traveling through a borehole fluid within a wellbore, the method comprising: conveying an acoustic device into the wellbore; the acoustic device comprising: a compensation fluid, an acoustic transducer at least partially disposed in the compensation fluid and configured to sense the acoustic signal, a metallic cover that separates the compensation fluid from the borehole fluid and configured to deform in response to a pressure difference between the borehole fluid and the compensation fluid, wherein the pressure difference is created by the acoustic signal and a hydrostatic pressure in the borehole fluid, and a processor in connection with the acoustic transducer; and sending or receiving an electric signal with the processor to or from the acoustic transducer. ### Claim 13 (depends on 12) The method of claim 12, wherein the metallic cover is substantially circular. ### Claim 14 (depends on 12) The method of claim 12, wherein the compensation fluid is disposed within a housing and the metallic cover is welded to the housing. ### Claim 15 (depends on 14) The method of claim 14, wherein the housing includes a pressure feed-through comprising at least one electrical connection to send or receive the electric signal with the processor to or from the acoustic transducer. ### Claim 16 (depends on 14) The method of claim 14, further comprising an insulating material between the acoustic transducer and the housing configured to provide at least one of an electrical insulation, an acoustic insulation, and a damping of mechanical shock or vibration. ### Claim 17 (depends on 16) The method of claim 16, wherein the insulating material comprises rubber. ### Claim 18 (depends on 12) The method of claim 12, wherein the metallic cover has one or more corrugations. ### Claim 19 (depends on 12) The method of claim 12, wherein the acoustic transducer has an inner surface that is radially inward with respect to an axis of the acoustic device and a terminal for electrical connection extending from the inner surface.