CN106032750B

CN106032750B - Geological logging instrument based on drilling energy spectrum

Info

Publication number: CN106032750B
Application number: CN201510117486.1A
Authority: CN
Inventors: 潘乐荀; 倪圣军; 戚俊; 杨胜伦; 任云; 魏帮俊; 曹泽勇; 骆斌
Original assignee: ANHUI HUIZHOU GEOLOGY SECURITY INSTITUTE Co Ltd
Current assignee: ANHUI HUIZHOU GEOLOGY SECURITY INSTITUTE Co Ltd
Priority date: 2015-03-18
Filing date: 2015-03-18
Publication date: 2019-12-06
Anticipated expiration: 2035-03-18
Also published as: CN106032750A

Abstract

The invention discloses a geological logging instrument based on a drilling energy spectrum. The three modules are all placed in the probe tube; the sensor module comprises a high-precision electronic compass, a MEMS vibration sensor, a programmable logic unit and a memory. The probe tube is arranged in the drill rod and works synchronously with the drilling machine, so that the time is saved and the efficiency is improved; the high-precision electronic compass, the MEMS vibration sensor and the vibration signal energy spectrum analysis technology are matched for use, so that the drilling depth, the drilling position condition of the drill rod and the strength of rock in front of a drill bit can be accurately recorded at one time, the related drilling information is accurately reflected, and the safety production of a coal mine at the later stage is effectively guided.

Description

Geological logging instrument based on drilling energy spectrum

Technical Field

The invention relates to the technical field of drilling equipment, in particular to a geological logging instrument based on a drilling energy spectrum, which is suitable for geological exploration holes, gas drainage holes, water drainage holes, grouting reinforcement holes and the like.

Background

For many coal and gas outburst and hydrogeological conditions complex and other mines, drilling work is the most direct and effective method for guaranteeing the safety production of the mines, is an important measure for preventing gas accidents and water damage accidents, and accordingly, the requirements on construction detection equipment and technologies such as water drainage holes and gas drainage holes are continuously improved.

In the drilling construction process, the following problems often exist due to some subjective and objective reasons: the existing method is basically limited to determining the drilling depth by manually counting the number of drill rods or measuring by poking iron wires, cork rods and the like after hole forming, which is labor-consuming, time-consuming and inconvenient; after the drill hole reaches a certain depth, the axis can be bent, and the drill rod cannot keep drilling straight; the difficulty of judging the drillability of the rock is high, and during drilling, due to the fact that the drill bit works underground, underground rock strata and other stratum structures are complex and cannot be distinguished by naked eyes, after the drill rod is withdrawn, the hole wall can be locally collapsed under the action of peripheral pressure to block drilling. The safety of the whole drilling work can be ensured only by fully mastering the drilling state.

In recent years, seismic while drilling techniques have been developed vigorously. The principle of the earthquake while drilling is as follows: the method is a seismic exploration method which uses weak seismic signals generated by impact and friction between a drill bit and a stratum in the drilling process of the drill bit as a seismic source, and the drill bit continuously advances during the recording of the earthquake while drilling. The invention aims to utilize vibration parameters of the existing seismic while drilling technology to discuss equipment capable of recording the drilling depth and recording the drilling position of a drill rod and the strength of a coal rock stratum in front of a drill bit.

Disclosure of Invention

The invention aims to solve the defects in the background technology, and provides a geological logging instrument which can log the drilling depth, the drilling position of a drill rod and the strength of a coal rock layer in front of a drill bit at one time.

In order to achieve the purpose, the invention adopts the following technical scheme: a geological logging instrument based on a drilling energy spectrum comprises a communication module, a sensor module and a power supply module for supplying power to the sensor module, wherein the sensor module comprises an electronic compass, an MEMS vibration sensor, a programmable logic unit and a memory, and the programmable logic unit is connected with the communication module; the sensor module, the power module and the communication module are arranged in a probe tube, and the probe tube is arranged in a section of drill rod adjacent to the drill bit; the electronic compass collects azimuth angle and inclination angle information of the drill rod in real time and stores the information into the memory through the programmable logic unit, the MEMS vibration sensor receives drill bit vibration information and stores the information into the memory after the information is collected by the programmable logic unit, the communication module is used for copying data stored in the memory into a computer of data to be processed, and the deviation angle and drilling depth of the drill rod are analyzed and lithology information of a front rock stratum is judged through post-processing.

The probe tube is made of wear-resistant, corrosion-resistant, high-strength and non-magnetic materials.

The memory is a U disk, a TF card or an SD card.

The principle of the invention is as follows: the method comprises the following steps that a probe tube with a sensor module, a power supply module and a communication module is placed in a drill rod needing to be drilled, because a drill bit continuously moves forward during recording of the earthquake while drilling, when the drill bit meets a front rock stratum, the sensor in the probe tube always receives information of vibration of the drill bit, the information is collected by a programmable logic unit (hereinafter referred to as FPGA) and then stored in a memory, the stored information at the moment can be analyzed to judge lithological information (high in frequency, hard in rock stratum, low in frequency and soft in rock stratum) of the front rock stratum, and after the information of a plurality of drill rock strata which are continuously arranged is collected, a rock stratum intensity distribution graph can be formed, and the later safety mining of a coal mine is effectively guided; meanwhile, the information such as the azimuth angle, the inclination angle and the like of the electronic compass is also collected in real time and stored in a memory, and the deviation condition of drilling of the drill rod can be analyzed through post-processing; during the period of stopping drilling and waiting for connecting another drill pipe, the vibration signal received by the sensor has weak amplitude (weak energy), and a low-amplitude wave group corresponding to the period of stopping drilling can appear in the later waveform analysis process. Therefore, by combining the characteristics, the drilling depth can be judged according to the number information of the abnormal low-amplitude wave groups, for example, three low-amplitude wave groups correspond to the length of 3 drill rods.

The invention has the beneficial effects that: firstly, the sensor module, the power supply module and the communication module are all placed in the probe tube and work synchronously with the drilling machine, so that the time is saved, and the efficiency is improved; secondly, the high-precision electronic compass, the MEMS vibration sensor and the vibration signal energy spectrum analysis technology are matched for use, so that the drilling depth, the drilling position condition of the drill rod and the strength of rock in front of a drill bit can be accurately recorded at one time, the related drilling information is accurately reflected, and the safety production of a coal mine at the later stage is effectively guided.

Drawings

FIG. 1 is a block diagram of the principle architecture of the present invention;

Fig. 2 is a schematic view of the position structure of the invention in the drill rod.

FIG. 3 is a graph of the amplitude spectrum acquired by the present invention when the drill pipe is stopped and another drill pipe is connected.

In the figure: 1. the system comprises a sensor module, a power module, a communication module, a probe, a drill rod, a drill bit, a wave group during drill stopping and a wave group during drill accessing and drilling, wherein the power module is 2, the communication module is 3, the probe is 4, the drill rod is 5, the drill bit is 6, the wave group during drill stopping is 7, and the wave group during drill accessing and drilling is 8.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

The first embodiment is as follows: as shown in fig. 1 and 2, the present invention includes a sensor module 1, a power module 2, and a communication module 3. The sensor module 1 comprises a high-precision electronic compass, an MEMS vibration sensor, a programmable logic unit (FPGA) and a memory (such as a U disk, a TF card and an SD card); the power module 2 is used for supplying power to the sensor module; the communication module 3 is used for copying the data stored in the memory into a computer of the data to be processed, and the communication interface is an RS485 interface or a USB interface. The modules are all placed in a probe tube 4, and the probe tube 4 is made of wear-resistant, corrosion-resistant, high-strength and non-magnetic materials.

the principle of the invention is as follows: the method comprises the following steps that a probe tube with a sensor module, a power supply module and a communication module is placed in a drill rod needing to be drilled, because the drill bit continuously moves forward during recording of earthquakes while drilling, when the drill bit meets a front rock stratum, the sensor in the probe tube always receives information of vibration of the drill bit, the information is collected by an FPGA and then stored in a memory (such as a U disk, a TF card and an SD card), the stored information at the moment can be analyzed to judge lithological information (high in frequency, hard in rock stratum, low in frequency and soft in rock stratum) of the front rock stratum, and after the information of a plurality of continuous drill rock strata is collected and arranged, a rock stratum intensity distribution map can be formed, and the later-stage coal mine safety mining can; meanwhile, the information such as the azimuth angle, the inclination angle and the like of the electronic compass is also collected in real time and stored in a memory, and the deviation condition of drilling of the drill rod can be analyzed through post-processing; as shown in fig. 3, during the period of stopping drilling to access another drill pipe, the vibration signal received by the sensor has a weak amplitude (weak energy), and a low-amplitude wave group 7 corresponding to the period of stopping drilling appears in the later waveform analysis process. Therefore, by combining the characteristics, the information of the number of 7 abnormal low-amplitude wave groups can be obtained when the drilling depth is judged; e.g. 3 low amplitude wave groups corresponding to 3 drill pipe lengths.

The foregoing is merely an example of the present invention and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the invention should be included in the protection scope of the invention.

Claims

1. A geology cataloger based on drilling energy spectrum which characterized in that: the sensor module comprises an electronic compass, an MEMS vibration sensor, a programmable logic unit and a memory, wherein the programmable logic unit is connected with the communication module; the sensor module, the power module and the communication module are arranged in a probe tube, and the probe tube is arranged in a section of drill rod adjacent to the drill bit; the electronic compass collects azimuth angle and inclination angle information of the drill rod in real time and stores the information into the memory through the programmable logic unit, the MEMS vibration sensor receives drill bit vibration information and stores the information into the memory after the information is collected by the programmable logic unit, and the communication module is used for copying data stored in the memory into a computer of data to be processed; after-treatment analysis: calculating the number of abnormal low-amplitude wave groups corresponding to drill stopping through a time domain; determining the drilling depth by utilizing the characteristic that the number of the abnormal low-amplitude wave groups corresponding to the drill stopping corresponds to the length of the drill rods with the number; determining the deviation angle of drilling of the drill rod according to the inclination angle and the azimuth angle of the drill bit; judging the lithology hardness of the front rock stratum through the high and low vibration frequency of the drill bit; therefore, the information of a plurality of continuous drilling rock strata is summarized and arranged to form a rock stratum intensity distribution map so as to guide the safety production of later-stage mines.

2. The drilling energy spectrum-based geological recorder of claim 1, wherein: the probe tube is made of wear-resistant, corrosion-resistant, high-strength and non-magnetic materials.

3. The drilling energy spectrum-based geological recorder of claim 1, wherein: the memory is a U disk, a TF card or an SD card.