http://www.youtube.com/watch?v=zzrHgUpfFJc

Packer slip: -- "клиновой захват"?

Packers have four key features:

Slip
Cone
Packing-element system
Body or mandrel.

The slip is a wedge-shaped device with wickers (or teeth) on its face, which penetrate and grip the casing wall when the packer is set. The cone is beveled to match the back of the slip and forms a ramp that drives the slip outward and into the casing wall when setting force is applied to the packer. Once the slips have anchored into the casing wall, additional applied setting force energizes the packing-element system and creates a seal between the packer body and the inside diameter of the casing.