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Preparation method of non-magnetic drill pipe for directional drilling of coal mine tunnel

A non-magnetic drill pipe and directional drilling technology, which is applied to other manufacturing equipment/tools, manufacturing tools, etc., can solve the problems of low drilling efficiency, low hole formation rate, poor stability, etc., to improve the strength of drill pipe, improve Abrasion resistance, weight reduction effect

Active Publication Date: 2020-05-08
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a non-magnetic drill rod for directional drilling in coal mine tunnels. Rods have problems of poor stability, low strength, frequent breakage and sticking, which lead to low drilling efficiency and low hole formation rate, and have the advantages of high strength, long life and high cost performance

Method used

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  • Preparation method of non-magnetic drill pipe for directional drilling of coal mine tunnel
  • Preparation method of non-magnetic drill pipe for directional drilling of coal mine tunnel
  • Preparation method of non-magnetic drill pipe for directional drilling of coal mine tunnel

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preparation example Construction

[0033] Under the premise of ensuring that the outer diameters of the rod body 3 , the female joint 1 and the male joint 5 are consistent, the inner diameter of the rod body 3 can be larger than the inner diameter of the steel pipe of the female joint 1 and the male joint 5 . Specifically, the preparation method of the non-magnetic drill rod for directional drilling in coal mine tunnels of the present invention comprises the following steps:

[0034] Step 1: The female joint and the male joint in the non-magnetic drill pipe need to be hardened, wherein the machining and threading of the female joint 1 and the male joint 5 can be completed first, and one end of the female joint 1 is provided with a female joint welding surface 10 , the other end is machined to form an internal thread 11, one end of the male joint 5 is provided with a male joint welding surface 50, and the other end is machined to form an external thread 52, and the internal thread 11 and the external thread 52 ar...

Embodiment 1

[0050] Taking the Ф89mm friction-welded non-magnetic drill pipe as an example, the drill pipe is equipped with a ZDY12000LD directional drilling rig and a Ф120 drill bit for geological drilling tests. The mud pulse wireless measurement-while-drilling method is used for directional pilot hole construction on site, with a cumulative footage of 200m and no magnetic field. The drill pipe did not break or stick, and the test results were good, which met the construction requirements of the project.

Embodiment 2

[0052] Take the Ф63.5mm friction-welded non-magnetic drill pipe as an example. The processing technology is the same as that of the Ф89mm non-magnetic drill pipe. The accumulative construction footage was 600m, during which no breakage or sticking occurred, and the test results were good, meeting the construction needs of the project.

[0053] Therefore, the present invention adopts the conventional three-section processing method of the drill pipe, divides the non-magnetic steel drill pipe into three parts of the male joint, the female joint and the rod body for processing, and welds them together through continuous drive friction welding. Since the friction welding seam of non-magnetic steel has to undergo high-temperature thermal cycles, hard and brittle σ phases are precipitated in the weld seam, resulting in a decrease in the strength of the weld seam. Strength increased to 700MPa.

[0054] Because the rod body and the joint are processed separately, the wall thickness o...

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Abstract

The invention discloses a preparation method of a non-magnetic drill pipe for directional drilling of a coal mine tunnel. The existing integral type is converted into a three-section type, friction welding is continuously driven to weld the drill pipe body and a joint together, and the heat flow pattern and friction impedance are used to adjust and control non-magnetic steel to continuously drivefriction welding, so that the welding seam strength is improved while solving the problem about losing of welding deformation reinforcement, tempering is carried out on the drill pipe after welding isfinished to release the welding stress, and the welding seam strength is improved; on the basis of the three-section type structure, surface-hardening treatment is carried out on the weak link namelythe drill pipe joint thread, so that local reinforcement of the drill pipe joint is realized while ensuring non-magnetic, the screwing-on and screwing-off times of the joint are effectively increased, the self strength, service life and the torsion resistance of the non-magnetic drill pipe are improved and prolonged, the torque born in the drilling process is enlarged, the production cost is reduced while improving the directional drilling efficiency, and the probability of safety loss and accident occurrence caused by drilling tool failure is reduced during the drilling process.

Description

technical field [0001] The invention relates to the technical field of coal mine mechanical equipment preparation, in particular to a preparation method of a non-magnetic drill pipe used for directional drilling in coal mine tunnels. Background technique [0002] Directional drilling technology is an advanced method for safe, green and efficient mining of coal. Non-magnetic drill pipe, as an important carrier of directional drilling technology, is the guarantee for the successful implementation of this technology. The basic principle of directional drilling is to rely on the induction of the earth’s magnetic field to measure the azimuth and depth of drilling. However, since conventional drilling tools are often magnetic, which interferes with the measurement of magnetic measurement equipment, the measurement information of the drilling trajectory cannot be obtained correctly. The instrument is placed in the non-magnetic drilling tool to protect it from the influence of the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P23/06
CPCB23P23/06
Inventor 温国栋骆晓炜田东庄董萌萌马晓琳田宏杰鄢忠方李骏
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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