Expandable device for use in a well bore
An expandable device comprising a plurality of expandable cells. The cells may be bistable cells or other types of cells that are expanded from a contracted position towards an expanded position. Additionally, the cells may be combined with locking mechanisms to hold the structure in an expanded position.
1. An expandable device for use in supporting or stabilizing a desired region of a well bore wall, comprising:
a downhole well device comprising a tubular expansion member movable between a contracted state and an expanded state and having a plurality of cells that are expandable from a closed position to an open position, each cell having at least one thin strut coupled to a thick strut;
wherein, when in the contracted state, the tubular expansion member is readily moved along the well bore;
wherein, when in the expanded state, the tubular expansion member can engage the well bore wall to provide support or stabilization of the desired region; and
wherein the plurality of cells comprise at least two cell sizes when the tubular expansion member is expanded to a fully expanded state, the fully expanded state comprising a maximum radial expansion of the tubular expansion member when radially expanded in free space;
wherein the thin strut and the thick strut are connected at each end of the struts and the non-connected portions of the struts move toward each other in the contracted state and move apart from each other in the expanded state.
2. The expandable device as recited in claim 1 , wherein the device comprises one or more locking mechanism.
3. The expandable device as recited in claim 2 , wherein the locking mechanism are distributed along the length of the device and are configured to block any substantial movement towards the contracted position of the device.
4. The expandable device as recited in claim 1 , wherein the plurality of cells are configured in rows about the tubular expansion member such that the rows alternate between the at least two cell sizes.
5. The expandable device as recited in claim 1 , wherein the tubular expansion member in the expanded state has a diametric measure greater than the tubular expansion member in the contracted state.
6. The expandable device as recited in claim 1 , wherein the at least two cell sizes comprise a first cell size having a first axial length along the tubular expansion member and a second cell size having a second axial length along the tubular expansion member.
7. The expandable device as recited in claim 6 , wherein the first cell size is configured to expand prior to the second cell size when the tubular expansion member moves from the contracted state to the expanded state.
8. The expandable device as recited in claim 1 , wherein expansion of the tubular expansion member is reversible and repeatable.