US 12,116,881 B2
Downhole tool with passive barrier
Jeffrey Johnston, Houston, TX (US); Justin Scruggs, Houston, TX (US); William Amend, Yorba Linda, CA (US); Daniel Hoyer, Rapid City, SD (US); William Kovacs, III, Dublin, OH (US); Fei Tang, Katy, TX (US); and Chris Taylor, Westerville, OH (US)
Assigned to SPARTAN TECHNOLOGY DEVELOPMENT CORP., Houston, TX (US)
Filed by SPARTAN DOWNHOLE, LLC, Houston, TX (US)
Filed on Sep. 10, 2022, as Appl. No. 17/942,129.
Claims priority of provisional application 63/243,468, filed on Sep. 13, 2021.
Prior Publication US 2023/0083743 A1, Mar. 16, 2023
Int. Cl. E21B 47/017 (2012.01)
CPC E21B 47/017 (2020.05) 24 Claims
OG exemplary drawing
 
1. A passive thermal barrier for use in a downhole tool comprising:
a multi-layered labyrinthine shell structure having a plurality of layers comprising an external layer and at least one internal layer;
a plurality of centralizers, polarly phased and longitudinally spaced, between each layer of the multi-layered labyrinthine shell structure; and
a plurality of point contacts polarly phased and longitudinally spaced on the external layer of the labyrinthine shell structure, radially equidistant to the central axis and comprising a material or materials having a low thermal conductivity;
wherein the plurality of centralizers between each layer of the multi-layered labyrinthine shell structure are radially equidistant to a central axis and comprise a material or materials having a low thermal conductivity, and
wherein said multi-layered labyrinthine shell structure is configured to reduce heat ingress from the external layer to the hollow core.