DEVICE FOR LIQUID PROBE TAKING FROM WELL Russian patent published in 2007 - IPC E21B49/08 G01N1/10 

FIELD: oil and gas industry, particularly to take samples from different well depths.

SUBSTANCE: device comprises cylindrical body and rod with diaphragms which may slide with respect to the body. The body is composed of stacked cylinders sliding along the body in axial direction and having channels with valves. Upper body part is provided with low-pressure chamber having technological rod with annular recesses converging downwards and formed in outer surface thereof. Outer surface body has annular grooves. The rod is rigidly installed in the body in air-tight manner and is sealed from below. Diaphragms are made as annular pistons installed in lower part of each body cylinder. Cavity located under each cylinder may communicate with well interior through channels provided with valves. Cavity located over piston may communicate with low-pressure chamber through rod. Hydraulic chamber with end part enclosing the body is located over the body. The hydraulic chamber has partition arranged over the body and enclosing technological rod. Upper part of hydraulic chamber is hermetically connected with pipe string and is provided with piston pressed from below by means of spring and enclosing technological rod in air-tight manner. The piston is provided with annular groove converging in upward direction. The annular groove has retaining ring, which may cooperate with annular depressions of technological rod. End part of hydraulic chamber seals channels formed in body cylinders and is provided with recess created in inner side thereof and having spring ring. The ring may cooperate with annular grooves of the body.

EFFECT: increased reliability and sample separation quality.

1 dwg