Hunan Steel Industrial Zone, No.9 Xiangfu Road, Yuhua District, Changsha, China
Geological drilling pipes(YB235-70) is for core drilling for geological department of tubes to be used is a kind of hollow cross-section, no seams around the long bar of steel. Steel hollow section with a large number of channels used for transmitting fluids, such as transmission oil, gas, gas, water and some solid materials, pipes and so on. Use can be divided into the drill pipe, drill collar, core pipe, casing and precipitation tubes.
Drill collar (drill collar): in the lower part of the drill string, bottom hole assembly is a major component. Its main feature is a large wall thickness (typically 38 ~ 53mm, the equivalent of drill pipe wall thickness of 4 to 6 times), with great gravity and stiffness. There are many different collar shapes, such as round, square, triangle and spiral. The most common is round (smooth) and spiral drill collar drill collar two.
Casing pipe: set the other parts of the tube, the cross section is circular, a variety of other devices used to protect the pipe material, mostly iron and steel. Casing is placed in large diameter pipes the naked eye, and the need to use cement. Designers must be designed well to withstand a variety of sets of external forces, such as collision, burst, tension, etc., and chemical erosion.