DEVELOPMENT METHOD OF HEAVY OIL OR BITUMEN MINE FIELD WITH CONTROL OF HEAT CARRIER PUMPED TO WELL Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method involves construction of upper injection well and lower production well with horizontal sections located one above the other, pumping of heat carrier through horizontal injection well with warm-up of formation, creation of steam chamber and extraction of the products through horizontal production well, at which thermograms of steam chamber are picked up, state of the chamber warm-up is analysed for uniform warm-up and available temperature peaks. Considering the obtained thermograms there performed is uniform warm-up of steam chamber, thus changing the warm-up zones. During construction of wells their horizontal sections are equipped with filters. On the mouth of injection well the pipe string for pumping of heat carrier is equipped with pipeline with a gate valve, and outlet openings of pipe string are arranged in the filter, thus dividing it into warm-up zones so that heat carrier breakthrough to production well through the zone that has been warmed up to a greater extent is excluded. Heat carrier supply is controlled depending on the thermogram of steam chamber, which is picked up in production well. In injection well the filter is tightly separated into two warm-up zones made in its initial and end sections. Heat carrier is pumped to the formation via pipe string through the filter, first to final warm-up zone of productive formation, and as the final zone is being wanned up, the pumped steam volume is redistributed between initial and final warm-up zones of productive formation. To the pipe string of injection well there lowered is a stem with a plunger. During the pumping process, the space between pipe string and stem on the mouth of injection well is sealed. Stem with plunger is arranged opposite the first group of output openings of pipe string made on one and the same level along the perimetre of pipe string with increase in their carrying capacity at an angle of 270° between minimum and maximum outlet opening with possibility of their alternative opening and closing. The second group of openings is made in the form of an open end of pipe string. Heat carrier is pumped at constant steam flow rate supplied to pipe string of injection well. Ratio of volumes of heat carrier pumped to initial and final warm-up zones of heat carrier is changed owing to changing the heat carrier volume supplied to the first warm-up zone by means of restricted rotation from well mouth of the stem with plunger through an angle of 25° to 270° relative to the first group of outlet openings of pipe string.

EFFECT: increasing the efficiency of the method due to gradual development of deposits and avoiding direct breakthrough of heat carrier to production well.

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