Indicating dog sub for weight-set packers

Details Indicating dog sub for weight-set packers Indicating dog sub for weight-set packers

E - Fixed Constructions

21

B

E21B 23/06 (2006.01)

Patent

CA 2226238

A dog sub is provided for use in an assembly for running liners with a weight-set packer. The dog sub allows rotation of the work string in an effort to set down weight on the dogs. The dogs are allowed to move radially outwardly by a pick-up force from the surface whereupon a set-down force, the dogs engage the setting sleeve on the weight-set packer. The dog sub is provided with a shear pin or other mechanism that breaks at about the requisite set force necessary to set the weight-set packer. When the assembly is retrieved to the surface, the breakage of the shear mechanism within the dog sub indicates to the surface personnel that an appropriate amount of set-down force has been applied to the weight-set packer below. Each of the dogs has an insert which rides on the polished surface of the packer setting sleeve to protect it as the dog sub is raised to allow the dogs to expand for setting the packer.

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