HEAT INSULATING DIRECTION Russian patent published in 2020 - IPC E21B36/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to a heat-insulating direction for use in oil and gas industry during development of wells in permafrost conditions to prevent their thawing. Heat-insulating direction includes at least two sections, each section of which contains coaxially located inner and outer pipes, between which heat-insulating material is arranged, wherein the length of each inner pipe is greater than the length of each outer pipe, the ends of the internal pipes of the adjacent sections are connected to each other by means of a collapsible joint, the joint zone of external pipes of adjacent sections is covered with a protective casing, fixed on external pipes, and the cavity between the protective casing and inner pipes interconnected each other by means of a collapsible joint is filled with heat-insulating material. Internal and external pipes of each section in their annular space are interconnected by at least one plate.

EFFECT: technical result consists in improvement of heat insulation conditions due to reduction of heat transfer in connection zone of internal and external pipe of each section with simultaneous increase of reliability and durability of heat-insulating direction.

10 cl, 4 dwg