Locking mandrel

Details Locking mandrel Locking mandrel

E - Fixed Constructions

21

B

166/42

E21B 23/02 (2006.01) E21B 23/10 (2006.01) E21B 34/06 (2006.01)

Patent

CA 1162844

LOCKING MANDREL Abstract of the Disclosure A locking mandrel including a pumpdown piston and flow control means in which a dog expander engages a shoulder in a landing nipple and is moved to dog expanded position to lock the locking mandrel in the landing nipple and in which the locking mandrel may be released from the landing nipple by moving the body thereof either upward or downward to shift the expander from under the dogs to permit them to retract and release the landing nipple.

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