FIELD: oil and gas industry.
SUBSTANCE: method involves: formation of annular channel between the first tubing string and the second tubing string; preparation of water-based insulating liquid containing liquid of water basis, organic liquid mixing with water, synthetic polymer and sheet silicates; location of water-based insulating liquid in annular channel and provision of possibility for hydration of sheet silicates, at that hydration of sheet silicates results in formation of gel from water-based insulating liquid. Water-based insulating liquid contains: liquid of water basis; organic liquid mixing with water; and hydrated sheet silicates containing at least one chosen from a group consisting of swelling fluoro-mica, montmorillonite, beidellite and any their combination; and where water-based insulating liquid is a gel.
EFFECT: improving stability under high temperatures, reducing heat conductivity.
23 cl, 2 ex, 4 tbl
