OIL PRODUCTION METHOD WITH FORCE APPLICATION TO RESERVOIR AND DOWNHOLE EQUIPMENT FOR ABOVE METHOD REALIZATION Russian patent published in 2006 - IPC E21B43/18 E21B43/25 

FIELD: oil production industry, particularly to produce oil from oil reservoirs along with simultaneous action application to reservoirs to increase oil recovery in complicated geological production conditions, especially at later development stages.

SUBSTANCE: method involves recovering oil by sucker-rod pump and creating multiple pressure oscillations in well fluid during sucker-rod pump operation as sucker rods move upwards and downwards; creating local oscillations of mechanical stresses in rock surrounding well, wherein above fluid pressure oscillations and mechanical stresses are generated in well interval opposite to reservoir interval and are concentrated directly near inner casing pipe surface or near opened well bore in limited well sections to transmit rock compression pulses into reservoir interior. Device for above method realization comprises sucker-rod pump case connected to production string and provided with suction valve. Device also has reciprocating piston with pressure valve installed in the case and connected to production string. The device is provided with additional production string including two sections telescopically connected with each other so that the sections may reciprocate. Upper production string section is connected to pump stem. Lower production string section may abut well bottom. Lower end of upper production string section is provided with centering conical piston. Upper end of lower production string section has split whipstock to provide mechanical stress concentration.

EFFECT: increased oil recovery due to force optimization and utilization of excessive electric sucker-rod pump drive power input, provision of favorable conditions to transmit pressure oscillations generated in well during sucker-rod pump operation and stresses at reservoir bottom zone and in reservoir, increased depth of force application, reduced power inputs, extended operational capabilities of the method and the device.

12 cl, 1 ex, 1 dwg