E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/64
E21B 23/06 (2006.01) E21B 33/129 (2006.01)
Patent
CA 1136038
ABSTRACT OF THE DISCLOSURE A bridge plug tool is disclosed, for temporarily plugging off a well casing to perform a downhole operation, such as cementing, or acidizing. The tool includes a mandrel having separate and spaced threaded segments thereon. During running-in of the tool into the well casing, one threaded segment engages a set of control members to keep the mandrel in place and to prevent it from shifting longitudinally with respect to the tool. In the set position the control members are disengaged from the mandrel and the other threaded segment engages a set of lock members. By applying a weight on the mandrel after threaded engagement of the mandrel with the lock members, a set of slip members and packing elements are caused to engage an inner surface of the casing wall to set the tool in position in the well casing. When the downhole operation is finished, the mandrel is rotated to disengage from the lock members and to re-engage the control members. This sequence disengages the slip members and packing elements from the casing wall so the tool can be retrieved from the casing, or re-set at another position in the casing. 28,422-F
351119
Smart & Biggar
The Dow Chemical Company
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