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US 4,380,347 AGranted
Well tool
OwnerDonald E. Sableinventor
Life of this patent
Estimating the term…
Abstract
A well tool, such as a drilling pipe string, whose joints are provided with tubular protectors which are restrained against vertical movement on the joints while permitting rotation of the drilling pipe string relative thereto when the protectors engage the internal surfaces of a well bore or of a well casing through which the drilling pipe string extends.
Claims1
A well tool including:
- a tool joint comprising a pin half on one section of an elongate tubular member having a reduced threaded end portion, and a box half on another elongate tubular member having a threaded bore in which said reduced threaded end portion is disposed, one of said tool joint halves having an externally reduced end portion providing an annular external shoulder, the other of said joint halves having an external annular shoulder, said shoulders facing one another;
- and a protector longitudinally and rotatably disposed on said reduced end portion of said one of said joint halves, said protector comprising a tubular mandrel having an internal diameter greater than that of said reduced end portion of said one of said joint halves and an external diameter greater than that of said annular shoulder whereby longitudinal movement of said mandrel relative to said joint halves is limited by said shoulders;
- and a plurality of longitudinally extending resilient compression members circumferentially spaced in said mandrel and secured thereto, said compression members being compressed between said mandrel and said reduced end portion of said one of said joint halves, said compression members permitting rotation of said mandrel relative to said tool joint.
Dependencies are inferred from the claim text.