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 by 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. 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. To the pipe string of injection well there lowered is a stem with a hollow plunger fixed on its end; during the pumping process, the space of heat carrier between pipe string and stem on the mouth of injection well is sealed; at that, outlet openings of pipe string are divided into two groups and correspond to initial and final warm-up zones of formation. The first group of outlet openings represents upward directed gauged openings of equal diameter d, which are made in the pipe string opposite initial section of filter with possibility of their alternative opening/closing by hollow plunger. The second group of openings is made in the form of a nozzle arranged inside the pipe string with outlet opening with diameter D. Total surface area of outlet openings with diameters d of the first group is larger than surface area of outlet opening with diameter D corresponding to the second group. Pumping of heat carrier to the formation is performed simultaneously to both warm-up zones of formation; at that, to initial section of filter there supplied is heat carrier volume that is by 1.5-2.5 times more than that supplied to the initial one, and as the productive formation is being warmed up, ratio of volumes of heat carrier supply to initial and final sections of the filter is changed depending on steam chamber thermogram. During operation of production well there controlled is carrying capacity of the first group of output openings opposite the first warm-up zone by means of conversion of stem rotational movement to restricted axial movement of plunger.

EFFECT: increasing steam chamber operating efficiency due to uniform generation of heavy fuel oil or bitumen by warming-up the initial warm-up zone of productive formation at the initial stage, avoiding direct breakthrough of heat carrier from outlet openings of pipe string and filter of injection well to horizontal section of production well, simplifying the technology and reducing metal consumption.

3 dwg