Short section device and method for collecting acoustic vibration signals while drilling

Abstract

The invention belongs to the technical field of mine gas prevention and control, and particularly relates to a short section device and method for acoustic vibration signal acquisition while drilling. One end of the short section is used for being connected with a drill bit, and the other end of the short section is used for being connected with a drill rod. A support is arranged in the middle of the interior of the short section, and a sensor used for receiving acoustic vibration signals is arranged in the support. A circuit board and a battery pack are arranged in the drill rod, the sensor is connected with the circuit board, and the battery pack is electrically connected with the sensor and the circuit board. According to the device, the problem that a near-bit obtains a coal body fracture acoustic vibration signal is solved, elastic waves generated when a drill bit cuts a coal body are transmitted to the sensor through the joint of the short section and the sensor support, and the signal collected by the sensor is stored in the circuit board. By means of the method, the near-bit coal body fracture acoustic vibration signals can be directly obtained, multi-source noise signals are reduced, the difficulty of extracting the characteristics of the coal body acoustic vibration signals with different intensities is lowered, and support is provided for research of the tectonic coal while-drilling acoustic vibration identification technology.

Description

Technical Field

[0001] This invention belongs to the field of mine gas control technology, specifically relating to a short-section device and method for acquiring acoustic vibration signals while drilling. Background Technology

[0002] The presence of tectonic coal is a significant factor leading to coal and gas outbursts. To prevent these outbursts, scholars both domestically and internationally have proposed identifying the distribution of tectonic coal in mining faces using borehole information. Currently, the main technologies for identifying coal and rock distribution using borehole information include borehole inspection technology, coal and rock property identification technology based on drilling rig vibration signals, and coal strength identification technology based on acoustic emission characteristics of coal and rock cutting damage.

[0003] Among them, borehole inspection technology involves placing an optical or electronic inspection instrument into the borehole to directly observe the structure of the coal seam on the borehole wall, thereby enabling the detection of tectonic coal areas. Although borehole inspection technology can directly observe the coal seam structure type, it requires drilling to be completed before the inspection instrument is inserted into the borehole. If this technology is used for every borehole, the on-site construction workload is enormous. If this technology is used for only a few boreholes, it has disadvantages such as a small detection range.

[0004] The technology for identifying coal and rock properties based on drilling rig vibration signals mainly involves installing vibration sensors on the drilling rig and analyzing the vibration signal characteristics of different coal and rock media to identify the coal and rock. Although this technology can identify the properties of coal and rock during the drilling process, the sources of vibration causing drilling rig vibration are complex and diverse. This results in numerous noise signals used for identifying coal and rock properties, and effective filtering methods affect the reliability of the technology.

[0005] The technology for identifying coal strength based on acoustic emission characteristics of coal cutting failure mainly involves installing acoustic emission sensors on the sidewall of a loaded coal cavity in a laboratory to collect acoustic emission characteristics of coal samples with different coal and rock properties, and then using the acoustic emission characteristics of coal samples with different strengths to identify the coal and rock strength. However, the implementation of this technology first requires obtaining the acoustic vibration signal of the drill bit cutting the coal body, and acoustic emission sensors cannot be directly installed inside the drill bit. Summary of the Invention

[0006] The purpose of this invention is to provide a short-section device and method for acquiring acoustic vibration signals while drilling, so as to realize the acquisition of acoustic vibration signals of coal cutting and fracturing, and provide support for the development of technology for identifying structural coal by acoustic vibration signals while drilling.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A short-section device for acquiring acoustic vibration signals while drilling includes: The short section has a drill bit connected to one end and a drill rod connected to the other end; A support is provided in the middle of the inside of the short section, and a sensor for receiving acoustic and vibration signals is installed inside the support; The drill pipe contains a circuit board and a battery pack. The sensor is connected to the circuit board, and the battery pack is electrically connected to both the sensor and the circuit board.

[0008] Furthermore, the short section is configured as a tubular structure, with the diameter of the end of the short section near the drill bit being smaller than that of the end near the drill rod, and the end of the short section near the drill bit being configured as a male thread, while the end of the short section near the drill rod being configured as a female thread.

[0009] Furthermore, the support and the short section are threaded together, and a chamber is provided inside the support. The sensor is disposed in the chamber, and the sensor is threadedly connected to the support.

[0010] Furthermore, the support is provided with through holes for ventilation and water passage along its edge.

[0011] Furthermore, the sensor is configured as an acoustic vibration sensor.

[0012] Furthermore, a first stabilizing connector is provided between the sensor and the circuit board, and a second stabilizing connector is provided between the circuit board and the battery pack.

[0013] Furthermore, a method for using a short-section device for acquiring acoustic signals while drilling, employing the aforementioned short-section device for acquiring acoustic signals while drilling, is as follows: The short section device for collecting acoustic vibration signals while drilling is installed between the drill bit and the drill pipe, and then drilling is carried out. The elastic waves generated by the drill bit cutting the coal body are transmitted to the sensor through the short section and the support. The sensor stores the collected signals in the circuit board. After drilling is complete and the drill rod is removed, the drill bit and short section are unscrewed, the signals stored on the circuit board are extracted, and finally analyzed using professional waveform software.

[0014] Compared with the prior art, the present invention has the following advantages: As described above, this invention relates to a short-section device and method for acquiring acoustic vibration signals while drilling. This invention solves the problem of acquiring coal fracture acoustic vibration signals near the drill bit. The elastic waves generated by the drill bit cutting the coal are transmitted to the sensor through the connection between the short section and the sensor support. The signals collected by the sensor are stored in a circuit board. This invention can directly acquire near-drill bit coal fracture acoustic vibration signals, reducing multi-source noise signals and lowering the difficulty of extracting acoustic vibration signal characteristics of coal with different intensities, thus providing support for research on acoustic vibration identification technology for structural coal during drilling. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0016] Figure 1This is a cross-sectional view of a short section device for acquiring acoustic vibration signals while drilling according to the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the installation of the drill bit, drill pipe, and short section in a short section device for acquiring acoustic vibration signals while drilling according to the present invention; Figure 4 This is a cross-sectional view of the support in a short section device for acquiring acoustic vibration signals while drilling according to the present invention. Figure 5 This is a side view of the support in a short section device for acquiring acoustic vibration signals while drilling, according to the present invention.

[0017] Explanation of reference numerals in the attached drawings: 1-Drill bit, 2-Drill rod, 21-Circuit board, 22-Battery pack, 23-First stabilizing connector, 24-Second stabilizing connector, 3-Short section, 31-Support, 311-Cavity, 312-Through hole, 313-Slot, 32-Sensor, 33-Sealing groove. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1 to 3 As shown, a short-section device for acquiring acoustic vibration signals while drilling includes a short section 3, with a drill bit 1 connected to the front end of the short section 3 and a drill pipe 2 connected to the rear end of the short section 3. Figure 3 As shown, a short section 3 is positioned between drill bit 1 and drill rod 2. The short section 3 has a tubular structure, with the diameter of the end of the short section 3 closest to drill bit 1 being smaller than the diameter of the end closest to drill rod 2. Specifically, the front end of the short section 3 is threaded to the rear end of drill bit 1, with the front end of the short section 3 having a male thread and the rear end of drill bit 1 having a female thread. The rear end of the short section 3 is threaded to the front end of drill rod 2, with the rear end of the short section 3 having a female thread and the front end of drill rod 2 having a male thread. The outer diameter of the rear end of drill bit 1, the outer diameter of the end of short section 3 closest to drill rod 2, and the outer diameter of drill rod 2 are all equal, meaning that when drill bit 1, short section 3, and drill rod 2 are connected as a single unit, their sides are smooth. A support 31 is threaded into the middle of the interior of the short section 3, with the middle of the interior of the short section 3 having a female thread and the outer end of the support 31 having a male thread. Additionally, a sealing groove 33 is provided in the middle of the interior of the short section 3, located at the front end of the connection between the short section 3 and the support 31. A sealing ring is provided between the short section 3 and the support 31, and the sealing ring is located in the sealing groove 33.

[0020] like Figure 4 and Figure 5 As shown, a chamber 311 is provided inside the support 31, and a sensor 32 is installed inside the chamber 311. The inner wall of the support 31 is provided with a female thread, and the outer wall of the sensor 32 is provided with a male thread. The support 31 and the sensor 32 are threaded together. The end of the support 31 near the drill rod abuts against the drill rod 2. The sensor 32 is a sound and vibration sensor used to receive sound and vibration signals. A through hole 312 is also provided at the edge of the support 31 for ventilation and water flow during drilling. In this embodiment, four through holes 312 are provided. The short section 3 is sealed to the support 31, so all the air and water generated during drilling are transmitted to the drill rod 2 through the through holes 312. The drill rod 2 has a channel connecting to the through holes 312, so it will not affect the operation of other mechanisms inside the drill rod 2, such as… Figure 1 As shown. In addition, a slot 313 is provided at the front end of the support 31. The support 31 is installed in the slot 313 by means of an installation tool, so as to facilitate a tight connection between the support 31 and the short section 3.

[0021] like Figure 1 As shown, the drill pipe 2 also houses a circuit board 21 and a battery pack 22. A sensor 32 is connected to the circuit board 21, and the signals collected by the sensor 32 are stored in the circuit board 21. The battery pack 22 is electrically connected to both the sensor 32 and the circuit board 21, and supplies power to both. A first stabilizing connector 23 is provided between the sensor 32 and the circuit board 21 to prevent poor contact due to relative movement between them. A second stabilizing connector 24 is provided between the circuit board 21 and the battery pack 22 to prevent poor contact due to relative movement between them.

[0022] The short-section device for acquiring acoustic vibration signals while drilling in this embodiment is used as follows: Before drilling, the circuit board 21 and battery pack 22 are placed in the drill rod 2. The support 31 is connected to the short section 3, and the sensor 32 is placed inside the support 31, ensuring a tight fit between the support 31 and the inside of the short section 3. The sensor 32 is then connected to the circuit board 21. Next, the front end of the drill rod 2 is tightened to the rear end of the short section 3. Finally, the front end of the short section 3 is connected to the rear end of the drill bit 1. After the entire assembly is complete, drilling begins. During drilling, the elastic waves generated by the drill bit cutting the coal are transmitted to the sensor 32 through the short section 3 and support 31. The signals collected by the sensor 32 are stored in the circuit board 21. Both the circuit board 21 and the sensor 32 are powered by the battery pack 22. After drilling is completed and the drill is withdrawn, the connection between the short section 3 and the drill bit 1, as well as the connection between the short section 3 and the drill rod 2, are loosened and removed. The acoustic and vibration signals stored in the circuit board 21 are then extracted, and finally, professional waveform software is used to analyze the acoustic and vibration signals.

[0023] The present embodiment has now been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present invention. Of course, the above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the content of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention and should be protected by the present invention.

Claims

1. A short-section device for acquiring acoustic vibration signals while drilling, characterized in that, include: The short section has one end for connecting the drill bit and the other end for connecting the drill pipe; A support is provided in the middle of the inside of the short section, and a sensor for receiving acoustic and vibration signals is installed inside the support; A circuit board and a battery pack are installed inside the drill pipe. The sensor is connected to the circuit board, and the battery pack is electrically connected to both the sensor and the circuit board.

2. The short-section device for acquiring acoustic vibration signals while drilling according to claim 1, characterized in that, The short section is configured as a tubular structure, with the diameter of the end of the short section near the drill bit being smaller than that of the end near the drill rod. The end of the short section near the drill bit is configured as a male thread, and the end of the short section near the drill rod is configured as a female thread.

3. The short-section device for acquiring acoustic vibration signals while drilling according to claim 1, characterized in that, The support and the short section are threaded together. The support has a chamber in which the sensor is placed, and the sensor is threadedly connected to the support.

4. The short-section device for acquiring acoustic vibration signals while drilling according to claim 1, characterized in that, The support is also provided with through holes for ventilation and water passage along its edge.

5. The short-section device for acquiring acoustic vibration signals while drilling according to claim 1, characterized in that, The sensor is configured as an acoustic vibration sensor.

6. The short-section device for acquiring acoustic vibration signals while drilling according to claim 1, characterized in that, A first stabilizing connector is provided between the sensor and the circuit board, and a second stabilizing connector is provided between the circuit board and the battery pack.

7. A method of using a short-section device for acquiring acoustic signals while drilling, employing the short-section device for acquiring acoustic signals while drilling as described in any one of claims 1 to 6, characterized in that, The usage method is as follows: The short section device for collecting acoustic and vibration signals while drilling is installed between the drill bit and the drill pipe, and then drilling is carried out. The elastic waves generated by the drill bit cutting the coal body are transmitted to the sensor through the short section and the support. The sensor stores the collected signals in the circuit board. After drilling is complete and the drill rod is removed, the drill bit and short section are unscrewed, the signals stored on the circuit board are extracted, and finally analyzed using professional waveform software.

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