CPC E21B 47/017 (2020.05) | 24 Claims |
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.
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