DEVICE FOR ACTUATION OF WELL CASING ATTACHMENT UNIT Russian patent published in 2014 - IPC E21B23/00 

FIELD: oil and gas industry.

SUBSTANCE: device includes a case with a radial opening, a hollow shear pin, an elastic collar and a pusher. The shear pin covers the radial opening inside the case and protrudes toward the case inner part. The elastic collar covers the radial opening outside the case and is fixed in it. The pusher with the elastic collar forms a circular cavity against its radial opening. The pusher is fixed in run-in position in regard to the case. The pusher is designed to move axially in its working position in order to interact with the casing attachment unit when the case cavity interacts with the circular cavity through the cavity of the broken shear pin and to fix the casing attachment unit in its working position.

EFFECT: higher operational reliability of the device, ensuring its universality, expanded scope of application.

8 cl, 2 dwg