WELL HEATER FOR INITIATION OF THERMAL-GAS-CHEMICAL REACTIONS IN WELLS OF COMPLEX PROFILE Russian patent published in 2012 - IPC E21B36/04 

FIELD: oil and gas industry.

SUBSTANCE: well heater for initiation of thermal-gas-chemical reactions in wells of complex profile comprises a hollow cylindrical casing with a heating element installed in it and connected with a source of power supply via a sealed electric slot, and a fuel element in contact with the heating element. The heating element is made in the form of a conductor of high-resistance metal pressed into an initiating element, which tightly contacts with the fuel element and providing for its ignition. Besides, the maximum diametre D of the well heater does not exceed the minimum inner diametre of the operational string in the narrowest interval. The optimal length L of the well heater is determined based on the given mathematical expression.

EFFECT: higher efficiency of using a well heater by expansion of its field of application, improved reliability of its operation and higher strength of the device.

16 cl, 2 dwg