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, valve, bypass channel and bypass channel closing member. Body is connected to pipe string to be lowered in casing pipe and is sealed from below. Body has upper, lower and central rows of radial orifices. Upper and lower channels are connected from outside through bypass channel formed by cylindrical bush rotationally installed on the body. The bush is provided with auger-shaped partition and with bypass channel closing member, which are installed in bypass channel. Bypass channel closing member is made as cylindrical insert fixedly connected with cylindrical bush from inner side thereof and partly closing central row of radial orifices. The insert has depressions, which may be periodically aligned with central orifice row as cylindrical bush rotates with respect to the body.

EFFECT: simplified structure and increased operational reliability.

2 dwg