Shell Oil Comapny

Erik Van Dalfsen

Antonius Leonardus Maria Wubben

Tino Walter Van Der Zee

Remmelt Bouma

A system for radially expanding a tubular element () in an underground borehole () comprises an expansion string () extending into the tubular element () and including an expander () and a jack device () for pulling the expander () through the tubular element () so as to radially expand the tubular element (). The jack device () is provided with an anchor () having at least one slip element () adapted to be radially moved against the inner surface of the tubular element (). A cage () is positioned above the tubular element (), which cage () is surrounded by a cylindrical wall and adapted to receive the anchor () and to be radially expanded by the anchor () against said cylindrical wall.

Expanding a tubular element in a wellbore

An anchoring system for anchoring a tool () in a downhole tubular element () comprises: &#x2014;an anchor () having a central body () connected to, or integrally formed with, the tool (); &#x2014;a slip element () radially movable relative to the central body () between a retracted and an expanded position against the inner surface of the tubular element (), &#x2014;a primary spring () for moving the slip element to the expanded position; &#x2014;a control device comprising a stop member () against which the slip element () is pushed by the primary spring (); and &#x2014;a secondary spring () acting on the stop member () to move each slip element () to its retracted position.

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Joure, Netherlands

Erik Van Dalfsen