METHOD OF REDUCTION OF HEAT EXCHANGE IN WELL IN DEVELOPMENT OF MULTI-LAYER FIELD IN CRYOLIC ZONE Russian patent published in 2001 - IPC

FIELD: oil-and-gas industry. SUBSTANCE: proposed method includes delivery of hotter well production via inner tubing string and delivery of colder well production via outer tubing string. Sectional rising tube is mounted in well. Short rising tube is lowered inside sectional tubing string; it is coupled in disconnector of tubing string, thus forming extension of lower portion of sectional tubing string over internal diameter. production from lower hotter stratum is withdrawn over lower portion of tubing string and then through disconnector and short tubing string; production of upper colder stratum is with drawn through filter to circular space between short and sectional tubing strings. production of colder stratum is delivered to wellhead via separate loop for production preparation unit. EFFECT: reduction of heat flow taken up by heat insulation. 2 dwg