DEVICE FOR TAKING SAMPLES OF WELL LIQUID Russian patent published in 2007 - IPC E21B49/00 G01N1/10 

FIELD: oil and gas extractive industry, in particular, technology for taking samples of well liquid from levels of varying depth.

SUBSTANCE: device includes cylindrically shaped body, rod with diaphragms, which are made with possible axial movement relatively to the body. Body is made in form of cylinders serially mounted one above other, which are equipped from below with channels with valves. From above body is equipped with low pressure chamber with technological rod, on external surface of which circular recesses, narrowing downwardly, are made. Circular grooves are made on external surface of body. From above the rod is equipped with pressure-relief valve. Rod is mounted hermetically and rigidly in the body, is hollow and sealed from below. Diaphragms are made in form of circular pistons, mounted in lower section of each cylinder of body. Under-piston hollow of each cylinder through channel with valve is made with possible connection to internal space of well, above-piston hollow - through rod with low pressure chamber. Mounted on top of body is hydraulic chamber with tail, having side longitudinal apertures and enveloping the body, and with wall, positioned above the body and enveloping technological rod. Hydraulic chamber from above is hermetically connected to pipes column and provided with an upwardly spring-loaded piston, hermetically enveloping the technological rod. Inside piston is provided with circular groove, narrowing upwardly. Circular groove of piston is provided with stopper ring, made with possible interaction with circular recesses of technological rod. tail of hydraulic chamber is made with possible hermetic closure of channels of body cylinders and is provided with a recess with spring rind on internal surface. Ring is made with possible interaction with circular grooves of body.

EFFECT: increased reliability and quality of separation of samples.

1 dwg