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A downhole tool apparatus for insertion into and sealing engagement with a wellbore. The apparatus comprises a tube having an expandable diameter, and a gripping member joined to the tube adapted to engage a portion of the wellbore to limit movement of the tube within the wellbore. The tube may also

A downhole tool apparatus for insertion into and sealing engagement with a wellbore. The apparatus comprises a tube having an expandable diameter, and a gripping member joined to the tube adapted to engage a portion of the wellbore to limit movement of the tube within the wellbore. The tube may also include a sealing member adapted to mate with the wellbore to form a sealing engagement.

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1. A downhole tool apparatus for insertion into a wellbore, the apparatus comprising:a tubular member having:an insertion configuration; anda set configuration in which:its outer diameter is greater than its outer diameter in the insertion configuration,it defines, and is disposed between, first and

1. A downhole tool apparatus for insertion into a wellbore, the apparatus comprising:a tubular member having:an insertion configuration; anda set configuration in which:its outer diameter is greater than its outer diameter in the insertion configuration,it defines, and is disposed between, first and second portions of the wellbore, andits movement is limited within the wellbore;a gripping member extending beyond the outer surface of the tubular member and adapted to penetratingly engage the wall of the wellbore when the tubular member is in the set configuration;an internal chamber defined by an inner surface of the tubular member and in fluid communication with the second wellbore portion when the tubular member is in the set configuration, so that fluid flow from the second wellbore portion to the internal chamber expands the outer diameter; anda valve engaged with the tubular member so that fluid in the first wellbore portion is permitted to flow through the valve and to the internal chamber when the tubular member is in the set configuration, and fluid in the internal chamber is not permitted to flow through the valve.2. The apparatus of claim 1 further comprising a sealing member extending beyond the outer surface of the tubular member and adapted to seal the wellbore when the tubular member is in the set configuration.3. The apparatus of claim 1 wherein fluid flow through the valve and to the internal chamber expands the outer diameter.4. The apparatus of claim 1 wherein the fluid in the first wellbore portion flows through the valve and to the internal chamber from a workstring disposed in the first wellbore portion and connected to the tubular member.5. The apparatus of claim 1 further comprising another valve engaged with the tubular member so that fluid flow from the internal chamber to the second wellbore portion is prevented when the tubular member is in the set configuration.6. The apparatus of claim 5 wherein fluid flow through the first-mentioned valve and to the internal chamber expands the outer diameter.7. The apparatus of claim 5 further comprising a sealing member extending beyond the outer surface of the tubular member and adapted to seal the wellbore when the tubular member is in the set configuration.8. A downhole tool apparatus for insertion into a wellbore, the apparatus comprising:a tubular member having an outer diameter, the tubular member defining and disposed between first and second portions of the wellbore when positioned in the wellbore;an internal chamber defined by an inner surface of the tubular member, the internal chamber in fluid communication with the second wellbore portion when the tubular member is positioned in the wellbore so that fluid flow from the second wellbore portion to the internal chamber expands the outer diameter;a valve engaged with the tubular member so that, when the tubular member is positioned in the wellbore, fluid flow from the first wellbore portion to the internal chamber is permitted and fluid flow from the internal chamber to the first wellbore portion is prevented; anda gripping member extending beyond the outer surface of the tubular member, wherein the gripping member is adapted to penetratingly engage the wall of the wellbore when the outer diameter expands by a predetermined amount.9. The apparatus of claim 8 further comprising a sealing member extending beyond the outer surface of the tubular member and adapted to seal the wellbore.10. The apparatus of claim 8 further comprising another valve engaged with the tubular member and permitting the fluid flow from the second wellbore portion to the internal chamber, and preventing fluid flow from the internal chamber to the second wellbore portion when the tubular member is positioned in the wellbore.11. The apparatus of claim 8 wherein fluid flow from the first wellbore potion to the internal chamber expands the outer diameter.12. The apparatus of claim 11 wherein the fluid flowing from the first wellbore portion to the internal chamber flows from a workstring disposed in the first wellbore portion and connected to the tubular member.13. A downhole tool apparatus for insertion into a wellbore, the apparatus comprising:a workstring;a tubular member connected to the workstring and having an outer surface defining an outer diameter;an internal chamber defined by an inner surface of the tubular member;a first valve engaged with the tubular member so that fluid flow from the workstring through the first valve and to the internal chamber is permitted to expand the outer diameter, and fluid flow from the internal chamber and through the first valve is prevented;a second valve engaged with the tubular member so that fluid flow from the wellbore through the second valve and to the internal chamber is permitted to expand the outer diameter, and fluid flow from the internal chamber and through the second valve is prevented; anda gripping member extending beyond the outer surface of the tubular member, wherein the gripping member is adapted to penetratingly engage the wall of the wellbore when the outer diameter expands by a predetermined amount.14. The apparatus of claim 13 further comprising a sealing member extending beyond the outer surface of the tubular member and adapted to seal the wellbore.15. The apparatus of claim 13 wherein the workstring and the tubular member are adapted to be disengaged after the gripping member penetratingly engages the wall of the wellbore.16. A method comprising:coupling a tubular member to a workstring;engaging a valve with the tubular member at a first location so fluid flow from the workstring, through the valve, and to an internal chamber defined by an inner surface of the tubular member is permitted, and fluid flow from the internal chamber and through the valve is prevented;positioning the tubular member in a wellbore;engaging another valve with the tubular member at a second location so fluid flow from the wellbore, through the other valve, and to the internal chamber is permitted, and fluid flow from the internal chamber and through the other valve is prevented; anddisengaging the workstring from the tubular member.17. The method of claim 16 wherein the fluid flow to the internal chamber radially expands at least a portion of the tubular member, and further comprising providing a gripping element on the tubular member that engages the wall of the wellbore, and providing a sealing element on the tubular member that seals the wellbore.18. The method of claim 16 wherein the fluid passing through the first-mentioned valve and to the internal chamber radially expands at least a portion of the tubular member, and further comprising providing a gripping element on the tubular member that engages the wall of the wellbore.