DOWNHOLE CASING PIPE VIBRATOR Russian patent published in 2007 - IPC E21B28/00 E21B33/14 

FIELD: well construction, particularly casing pipe cementing equipment.

SUBSTANCE: vibrator comprises hollow body with connection threads, piston-valve spring-loaded upwards and bypass channel. Hollow body is connected to casing pipe string below check valve and has upper, lower and central rows of radial orifices. Orifice rows are connected with each other from outside through bypass channel provided with annular piston-valve. Hollow body interior receives partition with throttle opening and arranged between upper and central orifice rows. Central radial orifice row may be sealed in initial position with piston-channel.

EFFECT: simplified structure and increased operational reliability.

1 dwg