SAMPLER Russian patent published in 2006 - IPC E21B49/08 G01N1/10 

FIELD: hydrogeological well survey, particularly to take subsurface well fluid samples.

SUBSTANCE: sampler comprises receiving chamber with piston, lower check valve with seat and control mechanism. The piston is provided with weight connected to piston top and having docking unit and with annular groove formed in lower part of outer piston surface. The receiving chamber is provided with process groove extending along outer surface thereof and with orifices arranged below the groove. Control mechanism includes balls, cylindrical rest and bush arranged over the cylindrical rest. The cylindrical rest has cylindrical cut formed on inner surface in upper part thereof and may perform axial movement relatively sealed chamber. The bush comprises spring centralizers and finger cooperating with process groove. The balls are installed in chamber orifices and may cooperate with annular groove from inner surfaces and with cylindrical rest from outer surfaces thereof. The cylindrical rest in its working position may cooperate with bush. Cylindrical cut may be opposite to receiving chamber orifices. The process groove is made as axial short and long cuts connected one to another so that as bush moves relatively the receiving chamber finger is displaced towards long axial cut.

EFFECT: increased simplicity and operational reliability, reduced costs.

2 dwg