Annulus pressure operated ratchet device

Details Annulus pressure operated ratchet device Annulus pressure operated ratchet device

E - Fixed Constructions

21

B

166/63

E21B 33/126 (2006.01)

Patent

CA 1277593

Abstract An annulus pressure operated ratchet device for use in a well bore. A mandrel includes an upwardly-directed elastomeric cup which is slidingly received over the mandrel. A sleeve is slidingly received over the mandrel beneath the cup and a ratchet disposed between the sleeve and the mandrel permits only downward movement of the sleeve. An elastomeric packer is received about the mandrel between the sleeve and an upwardly-directed shoulder. Annulus pressure urges the cup and sleeve downwardly to compress the packer thereby sealingly engaging it with the casing. The shoulder beneath the packer is threadably engaged with the mandrel by a left-hand thread. Right-hand mandrel rotation unthreads the connection thereby releasing the packer.

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