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 installed inside body and bypass channel. Body is connected to pipe string to be lowered in casing pipe and has upper, lower and central rows of radial orifices. Orifice rows are connected with each other from outside through bypass channel. Central radial orifice row may be sealed in initial position with piston-valve. Bypass channel between upper and central radial orifice rows is provided with valve, which permits fluid flow only in bottom-top direction.

EFFECT: simplified structure and increased operational reliability and possibility of vibrator interior cleaning of residual cement mortar.

1 dwg