Although the use of the drill works well in hard coal and above, but in high stress, high coal seam gas drilling process, often encounter "hole collapse," "plugging holes" and other conditions. Once the coal face gun hole collapse, spray holes, drilling fluid circulation channel will be gathered cinder block hole collapse, unable to continue drilling, and may lead to stuck pipe, buried hole drilling accident. Drill is, equipment or bottom outlet means for connecting the surface drilling equipment and is located in the bottom of the drilling and grinding with Lei Wen's tail. The purpose is to drill the drilling mud delivered to the drill bit, and increases along with the drill bit, reduce or rotate the bottom outlet means. Drill pipe must be able to withstand the tremendous external pressure, twisting, bending and vibration. In the mining and oil and gas refining process, the drill can be used repeatedly. Fluorescent tubes and the original steel pipe after many processing steps made after the drill pipe. First, by processing steel thickening process, the light within the curved outer surface of the tube, pipe wall thickening. Next, thread cutting performed to increase the strength and plated with copper. Then subjected to non-destructive quality control test, followed by the welded steel pipe joint. Then, pipe welding heat treatment and welding experience through final processing to eliminate welding residual stress. Before crossing the finished drill pipe coatings and packaging of finished steel To some additional testing, including hardness testing, stress testing and non-destructive testing. The length of the drill pipe is generally about nine meters. Drill using drilling fluid (usually air or water) slag. As the air of a small hole wall erosion, help to improve as porosity, in the soft air slagging coal seam drilling is often used; in other coal seams can be used both hydraulic slag, slag can be by air. In the drilling process, although there is no auxiliary light drill slagging functions, but light drill pipe during drilling of the hole wall disturbance small, will help improve the stability of the cell wall; the ring between the drill pipe and the hole wall space gap is relatively large, and drill on cinder resistance is also small, will help rule out cinder improve ROP. Changsha Tianhe drilling Machinery Co., Ltd. Contact: Liu Xiao Mobile: 13667359853 18507482826 Website: www.cstianhezj.com E-mail: 1139239907@qq.com Address: Ningxiang Jinzhou District Yao Singapore Industrial Park on the 18th day