DEVELOPMENT METHOD OF DEPOSITS OF VISCOUS OILS AND BITUMENS Russian patent published in 2014 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: development method of deposits of viscous oils and bitumens involves construction of a production well with a horizontal mined section in a productive formation, construction of an injection well with a horizontal mined section located above the similar section of the production well in the same formation at the distance of at least 4 metres, pumping of heat carrier to the injection well and extraction of the formation product from the production well, performance of temperature control of the extracted product of the well and flow rate control of the production well when at every reduction of flow rate or when temperature of the formation product of up to 90% of temperature of heat carrier breakthrough from the injection well to the production well is achieved there performed is insulation in equal section subsequently from the injection well mine face; after that, operation of wells is performed in a customary mode. Besides, the horizontal section of the injection well is built towards the horizontal section of the production well; the injection well is divided into sections with a pitch of 20-50 m; series heat carrier pumping is performed to each section, starting from the mine face with their further insulation with preservation of the distance excluding heat carrier breakthrough to the previous section. After heat carrier is pumped to the last section of the injection well, injection of heat carrier is performed throughout the length of the injection well in the volume approximately equal to total pumping volume to all the sections. The horizontal section of the production well is located at the level of at least 2 metres above oil-water contact.

EFFECT: improving displacement efficiency of viscous oils and bitumens, including by increasing the coverage of the formation with an action agent, additional production of viscous oils and bitumens due to subsequent treatment of the whole formation with simultaneous reduction of costs and simplification of construction of horizontal wells.

2 cl, 3 dwg