INERTIAL MECHANICAL PACKER Russian patent published in 2014 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to mining, in particular to oil producing industry, and may be used for operation of oil wells. The inertial mechanical packer comprises the pipe-mounted ring seal that separates the borehole cavity, a mechanical anchor and telescopic lock with limited axial motion of the tube inside the anchor, the latter contains spring-loaded friction slips placed in cage grooves. At the cage butt end there are expanding corrugated cams with pull-back springs pressing the cams to the tube as referred to the bushing covering the cams base and installed at the cage. The cams are made with inner conic surface interacting with matching conic part installed at the tube so that is may move axially. The telescopic lock includes a multiway labyrinth groove made at the tube surface interacting with a floating pin fixed at the movable ring that covers the tube section near the cage and matched to it by a coupling nut with potential longitudinal and angular movements at the tube within the range of the labyrinth groove. The seal ring interacts with dish-shaped supports covering but ends of the seal ring. The spring-loaded support is matched to the cross-over shoe connecting the packer tune with the flow string. There is a bushing between the cone and ring seal. The staged cylindrical part of the cone with thrust to the terrace and less diameter is connected to the bushing, whereat at the opposite side of butt end there is a dish-shaped support covering the ring seal end from the lower side. In the bushing at the dish-shaped support there is a collar leaning against the ring lug in the tube thus ensuring free placement of the ring seal at the tube between dish-shaped support before the packer setting to the borehole with potential movement in the ting lug bushing in direction of the less diameter of the cylindrical cone part to the distance equal to at least the length of the dish-shaped support shifting at the bushing per the value of the ring seal compression for the purpose of its radial expansion in order to disconnect the borehole cavity. In the bushing walls there are shear pins interacting with depression made at the tube ring lug thus excluding cone shifting in direction of the anchor cams when the packer is set to the borehole. In threaded openings outside the bushing there are depressions which could hide heads of the shear pins.

EFFECT: improving reliability of packers setting and improving encapsulation of tubular annulus in wells.

2 cl, 1 dwg