FIELD: oil production, particularly implosion devices to apply repeated hydroimpulsive action to bottom zone of producing formation and to increase bottom zone permeability due to deep overburden penetrating in the formation massif.
SUBSTANCE: device comprises implosion chamber mounted on flow string and provided with plunger installed inside the implosion chamber. Cup with openings is fastened to lower chamber part to receive valve with cylindrical return spring. The device also has additional spring having rigidity exceeding that of return spring to limit valve slide movement in slide travel end during valve opening. Additional spring is arranged around return one on the same seat surface.
EFFECT: increased operational reliability due to return valve spring freeing of impact load before spring compression under the action of liquid flow exiting from implosion chamber up to spring coil contact.
7 cl, 2 dwg
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