Hunan Steel Industrial Zone, No.9 Xiangfu Road, Yuhua District, Changsha, China
Heavy-weight drill pipe is made from AISI 4145H steel, after all the heat treatment of materials, all physical properties comply with recent provisions of API specification 7. Integral heavy weight drill pipe is a common transition between the drill pipe and drill collars of the drill, which can effectively alleviate the drill collars and transition in the combined stress concentration provides drilling, and can effectively reduce the drill and the wear rate of the connection area and diameter of the borehole. Drill pipe in central part of the thickened, welding joints and thickened in the middle part of the appearance of cemented carbide wear, can effectively protect the pipe from wear and tear. In a soft case of geological formations, heavy weight drill pipe can replace the drill collar to solve a series of problems occurred in vertical drilling.
Most commonly, heavy-weight drill pipe is used as a transition between the normal drill pipe and the heavier drill collars. Standard pipe can’t bear drill collars of vibration and intense pressure at the bottom, so heavy-weight drill pipe in this part of the drill string to withstand harsh conditions. Heavy-weight drill pipe looks very similar to the normal drill pipe, but it's processing in the form of more delicate than the drill collar has more flexibility at the same time.
In some applications, heavy-weight drill pipe may also be used in place of the drill collars。It is used most commonly in directional drilling. Because it bends easily, it simplifies directional control and minimizes connection fatigue problems common to high-angle or horizontal drilling.