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 sealed chamber, lower check valve with seat and control mechanism. The sealed chamber is provided with process groove extending along outer surface thereof and with orifices arranged below the groove. Check valve is spring-loaded in downward direction and is made as two cylinders connected one to another by conical part. Cylinder having greater diameter is located from above and provided with annular groove extending along outer surface thereof. Cylinder having lesser diameter is provided with stop located from cylinder bottom. The seat may cooperate with cylinder having greater diameter. Seat diameter is less than inner diameter of sealed chamber and has axial length less than that of cylinder with lesser diameter. 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 sealing chamber orifices and may cooperate with annular groove from inner surface and with cylindrical rest from outer surface thereof. The cylindrical rest in its working position may cooperate with bush. Cylindrical cut may be opposite to sealed chamber orifices. The process groove is made as axial short and long cuts connected one to another so that as bush moves in axial direction finger is displaced towards long axial cut.

EFFECT: increased simplicity and operational reliability, reduced costs.

2 cl, 2 dwg