Patent ID: 6253856
Filing Date: 2001-07-03
Classification: E21B

Abstract:
A pack-off system for packing off an area of interest in a wellbore, the pack-off system comprisinga body,two spaced-apart selectively settable packing elements on the body for sealing off the area of interest,selectively actuatable setting apparatus connected to the body for selectively setting the two spaced-apart selectively settable packing elements,the selectively actuatable setting apparatus actuatable by fluid under pressure introduced into the pack-off system,release apparatus selectively actuatable by reducing pressure of fluid pumped to the pack-off system to selectively release the two spaced-apart selectively settable packing elements,the selectively actuatable setting apparatus further comprisingtwo movable member apparatuses subject to force of the fluid under pressure introduced into the pack-off system,one of the movable member apparatuses movable in response to the force of the fluid under pressure to contact each of the two spaced-apart selectively-settable packing elements to boost sealing of said elements for sealing off the area of interest,wherein the area of interest is an area adjacent a bore of a string in the wellbore, the pack-off system is disposed in said bore, and the two spaced-apart selectively-settable packing elements are settable to seal off said bore, anda string to a lower end of which the pack-off system is connected.