METHOD OF WELL DUAL OPERATION Russian patent published in 2014 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method includes injection of working fluid through a long string with a packer to the lower object and extraction of reservoir fluid through a short string from the upper object. The long string is placed close to the well wall opposite the short string oriented to the mouth using a parallel anchor. Part of the long string below the parallel anchor is made of tubes of heat insulating material with diameter 1.25-1.52 times bigger than tubes upwards the parallel anchor. The axial packer is set at the end of the long string. The long string is tensioned till it adjoins the well wall. The short string has diameter 1.25 times bigger than diameter of the long string above the parallel anchor, and it is installed in the parallel anchor. Injection of the working fluid through the long string and extraction of reservoir fluid through the short string may be performed in periodical mode.

EFFECT: improving efficiency of dual operation of the well due to prevention of deposits in the shorter string.

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