DEVICE FOR SEQUENTIAL OIL AND WATER SAMPLING FROM WELL Russian patent published in 2017 - IPC E21B43/14 E21B43/12 E21B34/08 

FIELD: oil and gas industry.

SUBSTANCE: device includes a ran-in-hole electric centrifugal pump with a bottom-plugged inlet pipe branch passing through the packer which separates the upper and lower reservoir layers and has a hole for the exit of the lower layer products into the above-packer space and openings for intaking segregated oil and water of the lower layer through the inlet pipe branch, upper and lower floats of intermediate density with mounting seats located in front of the inlet openings, bottom-hole apparatus moved down inside the inlet pipe branch and connected to the telemetery system of submersible electric motor via a cable. There in the cylinder a spring-loaded piston with a lower rod designed to enter the mounting seat of the float is located above the mounting seat of the intermediate density float. A spring-loaded check valve is installed in the lower part of the inlet pipe branch. Moreover, the elasticity of the piston spring above the float exceeds the elasticity of the check valve spring.

EFFECT: increased reliability of sequential oil and water sampling from well for separate recording of the reservoir layer products in dual well operation.

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