Deformation of Drill Pipe Held in Rotary Slips

摘要

This paper presents an analysis of measurements of drill-pipe deformationudin the slip area. Drill pipe was loaded in excess of the load atudthe minimum yield strength with the pipe in VARCO Type SOL andudType SDXL slips. A VARCO Type MSS solid master bushing was usedudwith the type SDL slips and the master bushing of a VARCO KMPCudunit was used with the Type SDXL slips. Measurements were made onudthe reduction in pipe diameter in the slip area as a function of load.udValues of load which caused inelastic deformation of the pipe are determinedudand compared to the values previously calculated from theory.