# US 12,180,810 B2 · Energy-absorbing impact sleeve for perforating gun > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,180,810 B2 - Document ID: US12180810B2 - Status: Granted - Kind: B2 - Application number: 17/551,312 - Filed: 2021-12-15 - Published: 2023-06-15 - Granted: 2024-12-31 - Earliest claimed: 2021-12-15 - Assignees: Halliburton Energy Services, Inc. - Applicants: Halliburton Energy Services, Inc. - Inventors: Christopher C. Hoelscher; Courtney Ann Thain Roberts - Web page: https://patentgrep.com/patent/US12180810B2 ## CPC - E21B 43/119: Details, e.g. for locating perforating place or direction - E21B 43/117: Shaped-charge perforators (E21B43/118 takes precedence) - F42D 1/02: Arranging blasting cartridges to form an assembly (adaptation of blasting cartridges therefor F42B3/02) - F42D 5/00: Safety arrangements - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - F42D: BLASTING (fuses, e.g. fuse cords, C06C5/00; {for obtaining fluid from wells E21B43/00; for mining or quarrying E21C37/00; for making tunnels or galleries E21D9/006}; cartridges F42B3/00) ## Abstract An impact sleeve is used for mitigating damage in a perforating gun resulting from shaped charge detonation. In one example, a perforating gun includes a gun carrier, with a charge holder and the impact sleeve inside the gun carrier. The charge holder holds a plurality of shaped charges capable of being detonated with sufficient explosive energy to generate high-velocity fragments inside the gun carrier. The impact sleeve comprises an energy-absorbing material and optional raised features for absorbing at least some energy of the high-velocity fragments. The materials, raised features, positioning, and geometry of the impact sleeve and raised features may be tuned to optimize energy absorption. ## Claims ### Claim 1 A perforating gun, comprising: a gun carrier; a charge holder inside the gun carrier having a plurality of mounting holes for mounting respective shaped charges configured for being detonated with sufficient explosive energy to generate high-velocity fragments inside the gun carrier; and an impact sleeve inside the gun carrier configured for absorbing at least some energy of the high-velocity fragments, wherein the impact sleeve has a continuous undulating pattern of corrugated raised ridges that extends radially from one end of the gun carrier to an opposing second end of the gun carrier. ### Claim 2 (depends on 1) The perforating gun of claim 1, wherein the impact sleeve is radially positioned between the gun carrier and the charge holder to prevent a direct impact of the high-velocity fragments with the gun carrier. ### Claim 3 (depends on 1) The perforating gun of claim 1, wherein the impact sleeve is positioned radially inward of the charge holder. ### Claim 4 (depends on 1) The perforating gun of claim 1, further comprising: a first alignment fixture at a first end of the gun carrier supporting a first end of the charge holder and a first end of the impact sleeve; and a second alignment fixture at a second end of the gun carrier supporting a second end of the charge holder and a second end of the impact sleeve. ### Claim 5 (depends on 4) The perforating gun of claim 4, wherein the alignment fixtures each comprise a shoulder for supporting the impact sleeve between the gun carrier and the charge holder. ### Claim 6 (depends on 4) The perforating gun of claim 4, wherein the alignment fixtures each comprise a central recess for supporting the respective end of the impact sleeve radially inward of the charge holder. ### Claim 7 (depends on 1) The perforating gun of claim 1, wherein the impact sleeve comprises a sleeve diameter and a plurality of raised features axially spaced along the sleeve and radially extending from the sleeve diameter. ### Claim 8 (depends on 7) The perforating gun of claim 7, wherein the raised features comprise work-hardened deformations of a parent material of the impact sleeve. ### Claim 9 (depends on 7) The perforating gun of claim 7, wherein the impact sleeve comprises a sheet of impact-absorbing material helically formed into a tubular shape of the impact sleeve. ### Claim 10 (depends on 7) The perforating gun of claim 7, wherein the raised features engage a diameter of the charge holder, thereby radially spacing the sleeve diameter from the charge holder. ### Claim 11 (depends on 1) The perforating gun of claim 1, wherein a parent material of the impact sleeve comprises a greater ductility than a parent material of the gun carrier. ### Claim 12 (depends on 7) The perforating gun of claim 7, wherein the raised features comprise a corrugated pattern of raised ridges. ### Claim 13 (depends on 12) The perforating gun of claim 12, wherein the corrugated pattern undulates radially along an axial direction. ### Claim 14 (depends on 12) The perforating gun of claim 12, wherein the raised ridges comprise a size or spacing selected based on an expected mean particle size or velocity of the high-velocity particles. ### Claim 15 (depends on 1) The perforating gun of claim 1, wherein the impact sleeve comprises a sheet with formed features helically rolled into a tube having a helical seam. ### Claim 16 (depends on 15) The perforating gun of claim 15, wherein the helical seam is bonded. ### Claim 17 (depends on 16) The perforating gun of claim 16, wherein the helical seam is bonded by welding.