Oil well packer retriever

Details Oil well packer retriever Oil well packer retriever

E - Fixed Constructions

21

B

166/59

E21B 23/00 (2006.01) E21B 31/16 (2006.01) E21B 31/20 (2006.01)

Patent

CA 1203750

ABSTRACT An oil well packer retriever has a packer miller 6 which has a series of fin-like blades radiating from a central tube string 2. The blades are faced with tungsten carbide and in use these mill away the packer allowing it to drop under gravity. A packer catcher 7 catches and retains the fallen packer for removal from the well. The weight of the packer held by the catcher 7 bears on a shear collar 8 which is secured to the central string 2 by one or more shear bolts the combined shear strength of which is known. Should the shear stress on the collar 8 exceed that which has been preselected by the number and/or material of the shear bolts, the bolts shear releasing the collar 8 which drops out of engagement with the catcher 7 allowing the retriever to be withdrawn from the packer. The packer retriever can under normal condi- tions mill out find extract several packers without re-dressing the blades and replacing the catcher.

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