DEVICE FOR HERMETIZATION OF OPERATING AND SERVICE STRINGS IN OPEN-FLOW WELLS Russian patent published in 2017 - IPC E21B33/02 

FIELD: oil and gas industry.

SUBSTANCE: device for hermetization of operational and service strings in open-flow wells is proposed. It includes a unit for attaching the device to a flowing string, a hydrodrive mechanism for pointing and aligning the axes of the device and a flowing string and further inserting it into the well, as well as a hydraulic drive mechanism for fixing the device in the borehole with a locking body incorporated in it. In this case, the alignment with the axis of the borehole and the insertion of the hermetization device into its site is effected by one hydraulic cylinder built into two mating cylindrical bodies. One of the bodies, which is moveable, has a longitudinal groove with a rectilinear and inclined areas on the side surface, which ensure its successive rotational and vertical movements relative to the other body which is stationary, and an arm with a collar clamp is attached to its upper part perpendicular to the axis. The body of the attachment and hermetization mechanism is rigidly fixed in the arm. The attachment and hermetization mechanism consists of a two-rod hydraulic cylinder, one of which has locking and hermetization units at its lower end and is configured to be actuated for making a preliminary contact of these units with the inner surface of the string, and the second rod is configured to be actuated for the fixation of the device in the string. In this case, the second rod, at its upper end, has a locking body with a remote control device, with an additional provision for overlapping the passage section and terminating the flow of the flowing medium.

EFFECT: ensuring reliable hermetization of the cross-section of the service string by means of remote control to provide the safety of operational personnel, to insert and fix the hermetization unit in its mouth.

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