Adjustable flexibility anchor device with retractable arms for w

Details Adjustable flexibility anchor device with retractable arms for w Adjustable flexibility anchor device with retractable arms for w

1996-05-13

1998-06-23

Tsay, Frank

Wells

Expansible anchor or casing

166212, E21B 2300

Patent

active

057691630

ABSTRACT:
An elastic force generated by a volume of compressed gas in a chamber (7b) of a cavity (7) interior to the body of a well tool (1), acting on a piston (8), is used to open arms (4) intended to anchor the tool to the wall of a well (2). In order to close them, an opposed hydraulic force generated by a pump (13) driven by an electric motor (14) is applied intermittently, which brings piston (8) back to a recoil position. Piston (8) is coupled hydraulically with the cylinders of jacks (5, 6) acting on arms (4). A sufficient elastic force can thus be generated under a very low volume and the characteristics thereof can be readily changed by acting on the gas injection pressure and/or the extent of the dead volume when piston (8) is in a recoil position. Such device can be used for coupling sondes in wellbores for seismic prospecting for example.

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