# US 11,078,784 B2 · Dynamic transducer normalization > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,784 B2 - Document ID: US11078784B2 - Status: Granted - Kind: B2 - Application number: 16/595,617 - Filed: 2019-10-08 - Published: 2020-04-16 - Granted: 2021-08-03 - Earliest claimed: 2018-10-16 - Assignees: Halliburton Energy Services, Inc. - Applicants: Halliburton Energy Services, Inc. - Inventors: Richard Timothy Coates - Web page: https://patentgrep.com/patent/US11078784B2 ## CPC - E21B 49/003: {by analysing drilling variables or conditions (E21B49/005 takes precedence; systems specially adapted for monitoring a plurality of drilling variables or conditions E21B44/00)} - G01V 1/46: Data acquisition - E21B 1/00: Percussion drilling - E21B 47/0224: using seismic or acoustic means - E21B 47/085: using radiant means, e.g. acoustic, radioactive or electromagnetic - E21B 47/12: Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling - G01V 1/34: Displaying seismic recordings {or visualisation of seismic data or attributes} - G01V 1/48: Processing data - E21B 44/00: Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions - E21B 49/005: {Testing the nature of borehole walls or the formation by using drilling mud or cutting data} - G01V 2200/16: Measure-while-drilling or logging-while-drilling - G01V 2210/121: Active source - G01V 2210/1299: Subsurface, e.g. in borehole or below weathering layer or mud line - G01V 2210/1429: Subsurface, e.g. in borehole or below weathering layer or mud line - G01V 2210/54: Borehole-related corrections - G01V 2210/64: Geostructures, e.g. in 3D data cubes - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) ## Abstract A method may comprise recording a first reflected waveform with a first transducer to form a first data set from a first excitation, recording a second reflected waveform with a second transducer to form a second data set from a second excitation, estimating a first sensitivity correction factor for the first data set, applying the first sensitivity correction factor to at least a portion of the first data set to form a first sensitivity corrected data set. The method may further comprise estimating a second sensitivity correction factor for the second data set, applying the second sensitivity correction factor to at least a portion of the second data set to form a second sensitivity corrected data set, stacking the first sensitivity corrected data set amplitudes and forming a first image, stacking the second sensitivity corrected data set amplitudes and forming a second image, and comparing the images. ## Claims ### Claim 1 A method comprising: recording a first reflected waveform with a first transducer to form a first data set from a first excitation; recording a second reflected waveform with a second transducer to form a second data set from a second excitation; averaging the first data set to form an average reflection amplitude of the first transducer; averaging the second data set to form an average reflection amplitude of the second transducer; estimating a first sensitivity correction factor for the first data set by dividing the average reflection amplitude of the first transducer by the sum of the average reflection amplitude of the first transducer and average reflection amplitude of the second transducer; applying the first sensitivity correction factor to at least a portion of the first data set to form a first sensitivity corrected data set; estimating a second sensitivity correction factor for the second data set by dividing the average reflection amplitude of the second transducer by the sum of the average reflection amplitude of the first transducer and average reflection amplitude of the second transducer; applying the second sensitivity correction factor to at least a portion of the second data set to form a second sensitivity corrected data set; stacking the first sensitivity corrected data set amplitudes and forming a first image; stacking the second sensitivity corrected data set amplitudes and forming a second image; and comparing the first image and the second image. ### Claim 2 (depends on 1) The method of claim 1, further comprising calculating the first sensitivity correction factor and the second sensitivity correction factor at a beginning of a drilling run or end of the drilling run. ### Claim 3 (depends on 1) The method of claim 1, further comprising calculating the first sensitivity correction factor and the second sensitivity correction factor is applied over any length of a drilling run. ### Claim 4 (depends on 1) The method of claim 1, further comprising updating the first sensitivity correction factor and the second sensitivity correction factor at a designated depth. ### Claim 5 (depends on 1) The method of claim 1, further comprising updating the first sensitivity correction factor and the second sensitivity correction factor over a drilling run at any designated depth. ### Claim 6 A method comprising: disposing a downhole tool into a borehole, wherein the downhole tool comprises: a measurement assembly, wherein the measurement assembly comprises a first transducer and a second transducer; transmitting a first excitation from the first transducer and a second excitation from the second transducer; recording a first reflected waveform with the first transducer to form a first data set from the first excitation; recording a second reflected waveform with the second transducer to form a second data set from the second excitation; averaging the first data set to form an average reflection amplitude of the first transducer; averaging the second data set to form an average reflection amplitude of the second transducer; estimating a first sensitivity correction factor for the first data set by dividing the average reflection amplitude of the first transducer by the sum of the average reflection amplitude of the first transducer and average reflection amplitude of the second transducer; applying the first sensitivity correction factor to at least a portion of the first data set to form a first sensitivity corrected data set; estimating a second sensitivity correction factor for the second data set by dividing the average reflection amplitude of the second transducer by the sum of the average reflection amplitude of the first transducer and average reflection amplitude of the second transducer; applying the second sensitivity correction factor to at least a portion of the second data set to form a second sensitivity corrected data set; stacking the first sensitivity corrected data set amplitudes to form a first image; stacking the second sensitivity corrected data set amplitudes to form a second image; comparing the first image and the second image; and displaying the first image and the second image at a common depth and an azimuth window. ### Claim 7 (depends on 6) The method of claim 6, further comprising calculating the first sensitivity correction factor and the second sensitivity correction factor at a beginning of a drilling run or end of the drilling run. ### Claim 8 (depends on 6) The method of claim 6, further comprising calculating the first sensitivity correction factor and the second sensitivity correction factor is applied over any length of a drilling run. ### Claim 9 (depends on 6) The method of claim 6, further comprising updating the first sensitivity correction factor and the second sensitivity correction factor at a designated depth. ### Claim 10 (depends on 6) The method of claim 6, further comprising updating the first sensitivity correction factor and the second sensitivity correction factor over a drilling run at any designated depth. ### Claim 11 (depends on 6) The method of claim 6, wherein the first excitation and the second excitation are a pressure pulse. ### Claim 12 A system comprising: a measurement assembly comprising: a first transducer connected to the measurement assembly and configured to transmit a first excitation; and a second transducer connected to the measurement assembly and configured to transmit a second excitation; and an information handling system configured to: record a first reflected waveform with the first transducer to form a first data set from the first excitation; record a second reflected waveform with the second transducer to form a second data set from the second excitation; average the first data set to form an average reflection amplitude of the first transducer; average the second data set to form an average reflection amplitude of the second transducer; estimate a first sensitivity correction factor for the first data set by dividing the average reflection amplitude of the first transducer by the sum of the average reflection amplitude of the first transducer and average reflection amplitude of the second transducer; apply the first sensitivity correction factor to at least a portion of the first data set to form a first sensitivity corrected data set; estimate a second sensitivity correction factor for the second data set by dividing the average reflection amplitude of the second transducer by the sum of the average reflection amplitude of the first transducer and average reflection amplitude of the second transducer; apply the second sensitivity correction factor to at least a portion of the second data set to form a second sensitivity corrected data set; stack the first sensitivity corrected data set amplitudes to form a first image; stack the second sensitivity corrected data set amplitudes to form a second image; and compare the first image and the second image. ### Claim 13 (depends on 12) The system of claim 12, wherein the first excitation and the second excitation is a pressure pulse. ### Claim 14 (depends on 12) The system of claim 12, wherein the information handling system is further configured to display the first image and the second image at a common depth and an azimuth window. ### Claim 15 (depends on 12) The system of claim 12, wherein the information handling system is further configured to identify a borehole radius from a fluid sound speed calculation. ### Claim 16 (depends on 12) The system of claim 12, wherein the information handling system is further configured to calculate the first sensitivity correction factor and the second sensitivity correction factor at a designated depth. ### Claim 17 (depends on 12) The system of claim 12, wherein the information handling system is further configured to calculate the first sensitivity correction factor and the second sensitivity correction factor before beginning a drilling run or after the drilling run. ### Claim 18 (depends on 12) The system of claim 12, wherein the information handling system is further configured to re-calculate the first sensitivity correction factor and the second sensitivity correction factor over a drilling run at any designated depth. ### Claim 19 (depends on 12) The system of claim 12, further comprising a conveyance, wherein the measurement assembly is connected to the conveyance. ### Claim 20 (depends on 19) The system of claim 19, wherein the conveyance comprises a wireline, a slickline, coiled tubing, a drill pipe, or a downhole tractor.