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: development method of heavy oil or bitumen mine field with control of heat carrier pumped to the well 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 warming-up of formation, developing the steam chamber and extraction of product through horizontal production well, picking-up of thermogram of steam chamber, analysis of the warming state for uniform warming-up and availability of thermal spikes, and considering the obtained thermograms, uniform warming-up of steam chamber is performed by changing warming-up zones. At construction of wells, their horizontal sections are equipped with filters, and 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; supply of heat carrier is controlled depending on steam chamber thermogram 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, and outlet openings of pipe string are made opposite corresponding formation warm-up zones. Pumping of heat carrier to formation is performed simultaneously to both formation warm-up zones; at that, to the pipe string in injection well there lowered is stem with hollow plunger rigidly fixed on its end; space between pipe string and stem on the injection well mouth is sealed. Plunger is equipped with gauged openings with gradual increase in carrying capacity from the end of pipe string to well mouth or from well mouth to the end of pipe string with possibility of their alternative opening and closing. Each gauged opening is tightly arranged opposite one of outlet openings, which is made in pipe string and directed upwards, and the second outlet opening is made in the form of an open end of pipe string. Heat carrier is pumped at constant steam consumption; at that, ratio of volumes of heat carrier pumped to the first and the second warm-up zones is controlled owing to changing the volume of heat carrier supplied to the first warm-up zone by restricted axial movement of stem with hollow plunger and by changing carrying capacity of gauged openings with fastening of stem on well mouth.

EFFECT: increasing operating efficiency of steam chamber due to possible adjustable distribution of pumped steam volume; avoiding direct breakthrough of heat carrier from outlet openings of pipe string and filter of injection well to horizontal section of production well due to the fact that pipe string doe not have any outlet openings that are downward directed vertically to horizontal section of production well, reducing metal consumption and material and financial costs.

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