OIL-FILLED FORMATION PREHEATING METHOD Russian patent published in 2014 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method includes delivery of saturated or superheated steam at initial pressure to a tubing string inserted to the well in the oil-filled formation, measurement of steam temperature in time at the output from the tubing string with subsequent determination of the value of heat flow from the well to the formation in time and calculation of optimal steam consumption in time upon achievement of steam weight fraction at the output from annular space different from zero. Thus heat flow is compensated from the well to the formation by thermal energy released by steam in result of phase change. The current steam consumption is reduced up to the optimal value by reducing the initial pressure up to the value, at which steam temperature at the output from the tubing string remains permanent.

EFFECT: improving efficiency of the method due to reduction of capital costs and power consumption for its implementation.

7 cl, 1 tbl, 1 dwg