CIRCULATING VALVE Russian patent published in 2008 - IPC E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to a petroleum industry, in particular to the down hole equipment and can be used at an oil recovery, flushing, and development of holes, abandonment of hydratoparaffinic formations. It provides creation of the device with the monolithic one-piece cage, device simplification, increase of its reliability, a possibility of exact adjustment for work on selected depth depending on gravity of a fluid and a depth of immersion under the working level. Essence of invention: the device consists of the hollow body with attachment threads, a spring valve, and seal members. Thus the valve body is executed monolithic and not dismountable. The valve channel is placed on a side surface of the body and equipped on ends by blank flanges with seal members, between which the valve in the form of a plunger with the central channel and the radial through holes providing circulation of a fluid is placed. The plunger is fixed in the shut position by the calibrated springs, on one end of which the block of the shim washers is placed. It provides exact adjustment of the circulating flap on selected depth of array depending on fluid gravity and a depth of immersion under the working level. The quantity of the shim washers indispensable for adjustment of the circulating flap depending on a landing depth, fluid gravity and a depth of immersion under a working level is determined on analytical expression.

EFFECT: simplification and increasing of construction reliability; of the circulating flap working; possibility providing of exact adjustment for work on selected depth.

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