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Detailed analysis of round drill pipe, coal drill pipe and rock drill pipe | | Yikuang Technology
Release time:
2021-06-19
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Detailed analysis of round drill pipe, coal drill pipe and rock drill pipe | | Yikuang Technology
In the production and manufacturing process of drill pipe, the contradiction between strength and toughness is often encountered. Now in the process of drilling wells, most boreholes are not vertical, and the application of inclined wells and horizontal wells is increasing. Drill pipe is a kind of product with high precision, which is widely used in mining and coal mining industry. Its quality problem is paid attention to by everyone. However, in the process of use, there will be damage.
The spiral drill pipe is based on the high torque performance of the geological drill pipe, using single spiral blade or double spiral blade, after prestressed winding, fully automatic welding. In the diameter of 42mm below we also called spiral drill pipe. The geological spiral drill pipe with a diameter of 73mm or less can be used directly with various mining tunnel drilling rigs without changing the way of use. The drilling rig directly clamps the outer circle for drilling and replacement of the drill pipe, which is convenient and fast, and greatly reduces the labor intensity of workers.
The geological spiral drill pipe is mainly suitable for deep hole drilling construction with medium-hard geological conditions, and has the function of slag discharge. The spiral drill pipe is suitable for drilling construction of water exploration under the geological conditions of coal seam and near coal seam, and has the characteristics of light weight, rapid connection and fast slag discharge speed. According to the principle of "under the premise of meeting the strength requirements, choose low steel grade drill pipe as much as possible", the user selects the appropriate drilling tool for drilling operation according to the actual site, which not only reduces the procurement cost, but also reduces the probability of accidents.
Classification of drill pipe joints. According to the screw thread type drill pipe joints are divided into four types: internal flat (IF), penetration (FH), regular (REG); Digital (NC). Buckle connection conditions Three conditions must be met for buckle connection: ① equal size; ② same thread type; ③ matching of male and female buckles. The basic working principle of the spiral drill pipe: The main power system of the spiral drill pipe is the drilling fluid and the motor. The drilling fluid pumped by the mud pump is drilled into the hydraulic motor of the screw drill pipe, and a certain pressure difference is formed at the inlet and outlet of the motor. This pressure difference drives the motor rotor to rotate, and the torque and speed are passed through the universal shaft and the drive shaft. Transmitted to the drill bit.
Non-destructive quality management inspection is carried out, and then the steel pipe body is joined and welded by Ruilong drilling tools. Then the welding joint residual pressure is eliminated by welding heat treatment and welding final treatment. Before painting and packaging the finished drill pipe, other tests such as hardness test, pressure test and non-destructive test must be carried out on the finished steel pipe. Mine pipes and round steel pipes are made of drill pipes after many processing stages. First, through the treatment of the steel pipe thickening process, the appearance of the light pipe is bent toward the inside, and the steel pipe wall is thickened. Next, thread processing is performed and copper is plated to improve strength.
The drill pipe body is made of special alloy steel pipe for geology, and the drill pipe joint is made of alloy structural steel. After vacuum conditioning, the fatigue strength and shear strength are greatly improved. Using advanced friction welding process production and processing, Ruilong drilling tool drill pipe has the characteristics of high bending strength and firm welding. Usage of drill pipe (twist drill pipe): when twist drill pipe is used to hit the anchor cable eye of the gang, coal (rock) powder will be discharged out of the hole along the spiral line of the drill pipe, so there is no need for water supply and dust discharge, and the water accumulation at the coal head can be reduced when the roadway is excavated at a depression angle. The use of drill pipe and air coal drill can greatly improve the construction speed and construction quality of roadway.
Attention should be paid to avoid mixing drill pipes of different buckle types, even if they are not produced by the same manufacturer (because of the different technical parameters, processing methods, props and mechanical equipment of drill pipes manufactured by different manufacturers, the tolerance and close distance of drill pipes processed must be different); Do not mix drill pipes with too much difference between the old and the new and with too much difference in wear degree to avoid construction risks. It is found that the drill pipe buckle has local small-scale damage (about 1-2 buckles, 10mm long), which should be repaired in time before use.
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