# US 2021/0277766 A1 · Predicting Damage To Wellbore Tubulars Due To Multiple Pulse Generating Devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277766 A1 - Document ID: US20210277766A1 - Status: Published application - Kind: A1 - Application number: 16/331,256 - Filed: 2016-11-15 - Published: 2021-09-09 - Earliest claimed: 2016-11-15 - Assignees: Landmark Graphics Corporation - Applicants: Landmark Graphics Corporation - Inventors: Robello SAMUEL; Yuan ZHANG - Web page: https://patentgrep.com/patent/US20210277766A1 ## CPC - E21B 7/24: Drilling using vibrating or oscillating means, e.g. out-of-balance masses (percussion drilling E21B1/00) - E21B 47/007: Measuring stresses in a pipe string or casing (for locating blocked portions of pipes E21B47/09) - G01H 17/00: Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass - G01V 1/52: Structural details - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - G01H: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES - 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 includes comparing a natural frequency of a tubular with a frequency of each of at least two pulse generating devices positioned adjacent each other on the tubular, the tubular and the at least two pulse generating devices comprising an energy system; adjusting the frequency of at least one of the at least two pulse generating devices when the frequency is equal to the natural frequency of the tubular and obtaining an adjusted frequency different from the natural frequency; calculating an energy distribution in the energy system based on the natural frequency and the adjusted frequency of the at least one of the at least two pulse generating devices; and determining a new location on the tubular for positioning one or more of the at least two pulse generating devices such that energy introduced into the energy system is less than energy dissipated from the energy system. ## Claims ### Claim 1 A method, comprising: comparing a natural frequency of a tubular with a frequency of each of at least two pulse generating devices positioned adjacent each other on the tubular, the tubular and the at least two pulse generating devices comprising an energy system; adjusting the frequency of at least one of the at least two pulse generating devices when the frequency is equal to the natural frequency of the tubular and thereby obtaining an adjusted frequency different from the natural frequency; calculating an energy distribution in the energy system based on the natural frequency and the adjusted frequency of the at least one of the at least two pulse generating devices; and determining a new location on the tubular for positioning one or more of the at least two pulse generating devices such that an amount of energy introduced into the energy system is less than an amount of energy dissipated from the energy system. ### Claim 2 (depends on 1) The method of claim 1, wherein adjusting the frequency of the at least one of the at least two pulse generating devices comprises adjusting the frequency such that sympathetic vibrations in the tubular are minimized. ### Claim 3 (depends on 1) The method of claim 1, wherein calculating the energy distribution in the energy system comprises calculating the energy distribution in the at least two pulse generating devices and a portion of the tubular extending therebetween. ### Claim 4 (depends on 3) The method of claim 3, further comprising: calculating energy of stress waves generated, reflected, and transmitted by the at least two pulse generating devices; and calculating the energy of stress waves dissipated due to damping of the at least two pulse generating devices and the portion of the tubular extending therebetween. ### Claim 5 A system, comprising: a tubular having at least two pulse generating devices positioned on the tubular axially adjacent to each other, the tubular and the at least two pulse generating devices comprising an energy system; a computer system including a processor and a non-transitory computer readable medium storing a computer readable program code that when executed by the processor causes the computer system to: receive data including a frequency of each pulse generating device of the at least two pulse generating devices and a location of each pulse generating device on the tubular; calculate an energy distribution in the energy system; and determine whether an amount of energy introduced into the energy system is less than an amount of energy dissipated from the energy system. ### Claim 6 (depends on 5) The system of claim 5, wherein executing the program code further causes the computer system to calculate the energy distribution in the at least two pulse generating devices and a portion of the tubular extending therebetween. ### Claim 7 (depends on 6) The system of claim 6, wherein executing the program code further causes the computer system to calculate the energy distribution by calculating energy of stress waves generated, reflected, and transmitted by the at least two pulse generating devices, and to calculate the energy of stress waves dissipated due to damping of the at least two pulse generating devices and the portion of the tubular extending therebetween. ### Claim 8 A computer program product embodied in a non-transitory computer-readable medium and comprising a computer readable program code that, when executed by a computer system, causes the computer system to: receive data including a frequency of each pulse generating device of at least two pulse generating devices coupled adjacent to each other on a tubular and a location of each pulse generating device on the tubular, the tubular and the at least two pulse generating devices comprising an energy system; calculate an energy distribution in the energy system; and determine whether an amount of energy introduced into the energy system is less than an amount of energy dissipated from the energy system. ### Claim 9 (depends on 8) The computer program product of claim 8, wherein executing the program code further causes the computer system to calculate the energy distribution in the at least two pulse generating devices and a portion of the tubular extending therebetween. ### Claim 10 (depends on 9) The computer program product of claim 9, wherein executing the program code further causes the computer system to calculate the energy distribution by calculating energy of stress waves generated, reflected, and transmitted by the at least two pulse generating devices, and to calculate the energy of stress waves dissipated due to damping of the at least two pulse generating devices and the portion of the tubular extending therebetween.