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

FIELD: mining.

SUBSTANCE: double-armature mechanical packer includes a spindle, upper and lower armatures installed on it and provided with retaining jaws and cones unclamping them, a coupling in which a bore is made, and a lower nut connected to the cone of the upper armature temporary fixed on the spindle with shear pins and connected to the cone of the lower armature. An annular seal is made between the coupling and the lower nut. The upper part of the spindle is connected to an adapter, on which the upper nut is installed. A yoke of the upper armature and the upper nut are connected to each other with a casing, inside which a spring is installed to create pressure on the end face of the yoke of the upper armature relative to the adapter. Retaining jaws of the upper and the lower armatures are installed in radial slots of the yoke and spring-loaded in the spindle direction by means of flat springs. Additionally, in the yoke of the lower armature there installed are spring-loaded friction jaws. A labyrinth slot is made under the yoke. The yoke is connected to a flap. In the flap an arrangement is made for a floating pin of a telescopic lock. On the cylindrical surface of the retaining jaws of the upper armature there are projections located in openings made in the yoke wall. At least on the half the number of the retaining jaws there are notches with a thrust profile for engagement of the armature with the well shaft with possibility of longitudinal and radial movement of projections of the jaws in the yoke openings. The other part of the retaining jaws has a possibility of sliding along the well shaft, the projections of which are located in openings of the yoke with possibility of radial movement.

EFFECT: increasing tightness of separation of inter-pipe space of wells with mechanical packers and improving reliability of their being removed from a well.

6 cl, 1 dwg