GRABBING DEVICE FOR STUCK TOOL Russian patent published in 2009 - IPC E21B31/20 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry, and namely to emergency tools used for removing pipes from wells. The device consists of a body with grabbing elements, a guiding surface and a longitudinal flushing hole, inclined planes which are located diametrically and offset along the body axis and equipped with protrusions made in the form of a dovetail, which are interconnected with slots of the appropriate shape of grabbing elements, and a vibrator. The latter consists of a hollow cylinder and a stock with a through channel which is located in the cylinder, and a seat installed in the stock through channel for arranging the ball therein. The stock is equipped with upper and lower rows of radial holes which are connected to each other by means of a bypass channel provided between hollow cylinder and the stock. Hollow cylinder is eccentric and has the centre of gravity which is offset relative to the device axis. Blades are located tangentially in the bypass channel on the inner surface of hollow cylinder.

EFFECT: increasing operating efficiency, decreasing the device loads.

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