Api Pipe Oil Drill Pipe 

  Oil Drill Pipeis mainly used between dill collar and dill pipe to ease transition stress concentration and reduce the rate between contact area and outer wall wear, which can effectively prevent the pressure sticking.
For extended reach and horizontal wells, especially in wells where the total vertical depth to total measured depth ratio is low, high strength heavyweight drill pipe is often used high in the hole to apply weight on the bit.
Various combinations of Heavy Weight Drill Pipe, drill collars and standard drill string components can be created to meet the challenges of severe drilling conditions

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