Importance

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Abstract

A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel slideably mounted within a tubular barrel. A groove and roller connection guides the mandrel within the barrel during drilling. Resilient shock absorbing members between metal guide rings are carried between stop elements on the mandrel and barrel. Shock forces are absorbed by the telescoping movements of the mandrel within the barrel and by in the members acted on by the stop elements. The mandrel is formed of two pieces that threadedly connect to one another between the resilient shock absorbing members and the groove and roller connection. A lifting lug positioned above the rollers and below the shock absorbing members within an elongate mandrel groove, engages the joint to transfer the weight of the mandrel to the barrel upon withdrawal of the tool.

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First Claim