The use of geological drill pipes for coal mines

2020-10-22 16:00:47

The drill pipe is a steel pipe with a thread at the tail, which is used to connect the surface equipment of the drilling rig and the carbonyl drill grinding equipment or bottom hole device at the bottom of the well. The purpose of the drill pipe is to transport the drilling mud to the drill bit and raise, lower or rotate the bottom hole device together with the drill bit. The drill pipe must be able to withstand the internal and external pressure, distortion, bending and vibration of the world. In the process of oil and gas extraction and refining, geological drill pipes can be used many times.

　　The light pipe and the original steel pipe are made into drill pipes after many processing steps. First, through the treatment of the steel pipe thickening process, the outer surface of the smooth pipe is bent inward, and the steel pipe wall is thickened. In the next step, the thread is processed and plated with copper to increase strength. A non-destructive quality control inspection is then carried out, followed by the welding of the pipe body joints.

　　 Then, the pipe body will undergo welding heat treatment with triangular-edge drill pipe and welding final treatment to eliminate the residual pressure of welding. Before the finished drill pipe is painted and packaged, other tests should be carried out on the finished steel pipe, including hardness test, pressure test and non-destructive test.

　　The drill bit is the main component of the drilling rig. It is a tool that transmits impact energy, directly contacts the rock, and blasts. During the whole operation process of the drill bit, the force is very complex, so the material and shape of the drill bit have high requirements.

　　 1. Before drilling the hole, check whether the down-the-hole impactor, the pipe drill, the casing and the casing shoe are firmly connected, whether the eccentric drill bit rotates flexibly, and whether the ventilation is smooth.

　　 2. During the drilling process, attention should be paid to observe the follow-up situation of the casing and the powder discharge in the hole. A strong diamond drill should be used to blow the powder out of the hole every 0.3 to 0.4 meters to keep the hole clean. When blowing holes, the upward lifting distance of the center drilling tool should be strictly controlled so as to achieve strong blowing and powder discharge. It is forbidden to pull the center drilling tool forcefully during the drilling process.

3. When drilling is over or the center drilling tool needs to be replaced, the hole should be cleaned first to blow out the residue at the bottom of the hole, then stop turning, and slowly lift the center drilling tool upwards. The lifting force is as good as the PDC drill bit. It is appropriate to lift the center drilling tool, and the lifting height should be as long as the back of the eccentric drill bit touches the front end of the casing shoe; then reverse the drilling tool at low speed and try to lift the center drilling tool slowly. When it is observed that the center drill can be lifted smoothly, it indicates that the eccentric drill bit has been folded. At this time, the center drill can be lifted according to the conventional method until the center drill is fully raised. When reversing the drill, you should be careful to prevent the drill from tripping.

　　Linqing Huanye Machinery Co., Ltd. is a manufacturer of geological drill pipes and PDC drill bits. It is mainly engaged in the development and sales of various grooved drill pipes, triangular drill pipes and diamond composite drill bits. The source factory produces and sells itself, with good quality and low price!