MONITORING OF WELLS THERMAL INTERACTION WITH PERMAFROST STRATA Russian patent published in 2014 - IPC E21B47/07 E21B36/00 

FIELD: oil-and-gas industry.

SUBSTANCE: invention can be used at exploration of northern deposits and at control over heat-isolation capacity of well structure, contact of permafrost strata thawing halos at adjacent wells of developed deposit cluster. Thermal and physical conditions at wells are determined at two adjacent walls with subsiding permafrost strata that can cause problems at their thawing. Note here that thermometer instruments are arranged in every well behind the outer case strings for temperature measurement in well string space nearby permafrost stratum and at wellhead for fluid temperature registration inside every well at first and second time moments for every well. Said time moments are counted down from the start of well operation to start of permafrost stratum thawing there around. Measures temperatures and time of thawing start are introduced into expressions used to define the empirical factor dependent on stratum heat conductivity. Rime-variable radii of thawing zones and width of through thawed fracture are compared with their actual values measured at gas penetration to forecast the well conditions.

EFFECT: intensified oil production.

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