Patent ID: 7757756

Claim:
A bridge plug, comprising: an axially compressible cylinder having a top end and a bottom end; a plurality of slips extending downwardly from the bottom end of said cylinder, the slips being resiliently biased toward a deployed position wherein ends of the slips extend outwardly beyond an extended outer circumference of said cylinder; a threaded mandrel extending axially through said cylinder, the mandrel having a drive engaging head disposed above the top end of the cylinder and a threaded end extended through and threadably engaged with the bottom end of said cylinder, whereby rotation of the mandrel causes the bottom end of said cylinder to travel along the mandrel; a retaining member disposed near a bottom end of said mandrel, the retaining member being configured to releasably retain said slips in an undeployed position wherein the ends of the slips are held within the extended outer circumference of said cylinder; and at least one coupling member disposed on the top end of said cylinder, the coupling member being configured to be removably engaged with a setting tool; wherein said retaining member is movable relative to the bottom end of said cylinder between a retaining position wherein the ends of the slips are retained in said undeployed position and a deploying position wherein the ends of the slips are released such that the slips move to their deployed position.