Shale gas Drilling Pipe

摘要

A tube of drilling for Oil and Gas Drilling, comprising two joints of pipe Shaft and a Main portion between the joints of pipe Rod with two recalcaduras adjacent to joints of pipe Rod, and a Central Section between the recalcaduras.The Outer diameter of the Middle section of the main portion is smaller than the Outer diameter of the recalcaduras the main portion, and the Outer diameter of the Middle section of the main portion is between 4 (10.16 cm) and 4 (1 / 2 inch 11.34).