SYSTEM AND PROCEDURE FOR EXTRACTION OF OIL AND/OR GAS (VERSIONS) Russian patent published in 2011 - IPC E21B43/16 

FIELD: gas and oil production.

SUBSTANCE: system consists of first multitude of wells distributed over pay and second multitude of wells distributed over pay. Also, the first multitude of wells is equipped with devices for pumping mixing composition increasing oil recovery into the pay, while the second multitude of wells is equipped with devices for extraction of oil and/or gas from the pay during the first period of time. Also, the second multitude of wells is equipped with devices for pumping mixed composition increasing pay oil recovery into the pay, while the first multitude of wells is equipped with devices for extraction of oil and/or gas from the pay during the second period of time. In the pay the first multitude has a profile of mixed composition increasing oil recovery, while the second multitude of wells has a profile of oil inflow in the pay. Additionally, in the system the said profile of mixed composition is mutually shut off for increasing oil recovery from the pay and the said profile of oil inflow. The procedure consists in pumping composition including carbon bisulphide into the pay during the first period of time from the first well. Composition with carbon bisulphide is pumped under pressure exceeding initial pressure in the pay measured before pumping carbon bi-sulphide at value in interval from 0 to 37000 kPa. Further, carbon dioxide is pumped into the pay during the second period of time from the first well to ensure forcing composition including carbon sulphide through the pay. Oil and/or gas are extracted from the pay through the second well.

EFFECT: raised efficiency of procedure and reliability of systems operation.

31 cl, 8 dwg