DEVICE FOR CONTROL OVER FLUID WITHDRAWAL IN WELL OPERATION Russian patent published in 2012 - IPC E21B43/12 E21B33/12 

FIELD: oil-and-gas production.

SUBSTANCE: proposed device comprises parker. Said parker comprises casing with lock, top coupling, elastic gland and adjusting assembly made up of hollow casing locked in coupling, seat, radial channels, shut-off element and compression spring. Locking element is made up of slips moving apart in fitting in place. Hollow casing inner space is provided with changeable jet. Hollow casing is provided with annular contraction with top and bottom chamfers arranged above radial channels. Top chamber angle is smaller than that of bottom chamber. Seat is fitted into hollow chamber to move up and down therein as-sealed. Shut-off element is provided with shaft with grooved surface to receive spring ring to interact with said annular contraction. Note here that spring stiffness, angles of chamfers and rigidity of spring ring are selected to allow spring contraction by pressure differential and spring ring displacement below said hollow casing annular contraction. Thereafter, shut-off element moves up while spring ring displaces into its initial position, that is, above hollow casing annular contraction.

EFFECT: simplified design, decreased consumption of metal.

1 dwg