• Drilling

    Oil Well Drilling Pipe

        The major portion of drill string is composed of drill pipe. Drill pipe consists of three components: a tube with a pin tool joint welded to one end and a box tool joint welded to the other.       Before the tool joints are welded to the tube, the tube is upset, or forged, on each end to increase the wall thickness.  After upsetting, the tube is heat treated to the proper grade strength. All tool joints are heat treated to the same material yield strength (120,000 psi), regardless of the grade of pipe to which they are attached. Most drill pipe is made from material similar to AISI…