METHOD OF DRAINING LIQUID FROM WELLS WHEN USING UNDERGROUND OIL PRODUCTION METHOD Russian patent published in 2018 - IPC E21B34/02 F16K31/18 

FIELD: oil and gas industry.

SUBSTANCE: method includes supplying liquid to the divider through a hole in the cover of the upper chamber, filtering large mechanical impurities, supplying liquid into the upper chamber with a float, then through openings of throttle partition into the lower chamber to the valve unit. Under the action of high level of liquid in the upper chamber, the float moves upward and, by means of the rod, it opens a first small valve. Then, if it is necessary to increase the throughput capacity of the large valve, moving the small valve with one degree of freedom inside the large valve and together with it inside the sleeve along the common vertical axis. After draining liquid through the discharge bushing under the action of lowering of liquid level in the upper chamber, the float moves down and closes both valves.

EFFECT: improved safety of the drainage process due to smooth adjustment of liquid outlet and provision of process continuity.

3 cl, 12 dwg