A self-powered sensor for downhole drilling tool vibration measurement and safety monitoring

Abstract

The present invention discloses a self-powered sensor for measuring vibration and safety monitoring of downhole drilling tools, comprising: a housing for connecting with the drilling tool, a first acrylic plate installed at the bottom; an arc-shaped support block for supporting the rolling of a small ball, a sensing electrode group pasted on the contact surface of the small ball, and a second acrylic plate connected at the bottom; a nano-friction material film and a sensing electrode for friction; and a single-chip computer connected to the sensing electrode group, the small ball slides under the vibration of the drilling tool, the single-chip computer collects the output signal, and calculates the amplitude and frequency according to the position of the sensing electrode in the sensing electrode group; the second acrylic plate vibrates up and down with the drilling tool, the nano-friction material film of the second acrylic plate and the nano-friction material film on the surface of the first acrylic plate are triboelectrically charged, and the axial vibration frequency is calculated through the output signal. The present invention can collect the frequency of axial vibration, as well as the frequency and amplitude of lateral vibration in real time, and can monitor the lateral vibration of the drilling tool at the same time to realize alarm.

Description

Technical Field

[0001] The invention relates to the technical field of downhole drilling tool vibration parameter measuring equipment, and in particular to a self-powered sensor for downhole drilling tool vibration measurement and safety monitoring. Background Art

[0002] The evaluation and exploitation of underground mineral resources mainly adopt drilling technology. During the drilling process, the downhole drill bit combination will vibrate differently under the influence of alternating stress, which will cause fatigue damage and damage to the drill bit. There are three types of vibrations that occur during the operation of the drill bit: torsional vibration, axial vibration, and lateral vibration, among which lateral vibration has the greatest impact on the drill bit. At present, the research on axial vibration in the market has matured, and vibration measurement systems such as MWD (measurement while drilling) and LWD (logging while drilling) have been studied and manufactured, but there is a lack of relatively simple and low-cost sensors that can monitor the lateral vibration of downhole drill bits, especially the lack of sensors for amplitude measurement. Moreover, as the drilling depth increases, the downhole sensor needs longer cables or larger batteries to provide energy, which greatly affects the drilling efficiency. Therefore, it is urgent to design a sensor that can monitor the lateral vibration of the drill bit, while reducing the dependence on external power supply and issuing an alarm when the lateral vibration exceeds the working requirements. Summary of the invention

[0003] In view of this, in order to solve the problem of measuring the lateral vibration parameters of the drill tool and relying on an external power supply, the present invention provides a self-powered sensor for downhole drill tool vibration measurement and safety monitoring, which has a simple structure, low cost, self-powered, and can measure the lateral vibration parameters of the drill tool.

[0004] In order to achieve the above-mentioned object, the present invention provides a self-powered sensor for downhole drilling tool vibration measurement and safety monitoring, comprising: a first acrylic plate, a first sensing electrode, a first nano-friction material film, a second acrylic plate, a second sensing electrode, a second nano-friction material film, a shell, a small ball, a sensing electrode group and an arc-shaped support block;

[0005] The housing is connected to the drill, the first acrylic plate is installed at the bottom of the housing, and the first sensing electrode and the first nano-friction material film are arranged on the upper surface of the first acrylic plate from bottom to top;

[0006] The second acrylic plate is located directly above the first acrylic plate, and the second sensing electrode and the second nano-friction material film are arranged on the lower surface of the second acrylic plate from top to bottom;

[0007] The upper surface of the second acrylic plate is connected to the arc-shaped support block through a spring, the arc-shaped support block is used to support the rolling of the ball, and the sensing electrode group is pasted on the contact surface of the ball;

[0008] The sensing electrode group is connected to a single-chip microcomputer. The small ball slides due to the vibration of the drill. The single-chip microcomputer collects the output signal of the sensing electrode group, and calculates the lateral vibration amplitude and frequency of the drill according to the position of the sensing electrodes in the sensing electrode group. At the same time, the second acrylic plate connected to the arc-shaped support block at the bottom of the sensing electrode group vibrates up and down with the drill. The first nano-friction material film and the second nano-friction material film undergo friction electrification and electrostatic induction. The output signal is collected through electrostatic induction, and the axial vibration frequency of the drill is calculated.

[0009] Preferably, the sensing electrode group includes a plurality of sensing electrodes, each of the sensing electrodes is evenly distributed and respectively connected to a plurality of I / O ports of the single chip computer.

[0010] Preferably, the height of the spring needs to ensure that the first nano-friction material film is in contact with the second nano-friction material film in a static state.

[0011] Preferably, the first induction electrode is connected to the second induction electrode via an electrometer, and the frequency of the electrical signal generated by the friction between the first nano-friction material film and the second nano-friction material film is the axial vibration frequency of the drilling tool.

[0012] Preferably, the sensing electrode group is in the shape of concentric rings, and the sensing electrode at the center is circular.

[0013] Preferably, the first acrylic plate, the first sensing electrode, the first nano-friction material film, the second acrylic plate, the second sensing electrode and the second nano-friction material film are all circular in shape, and the first sensing electrode, the first nano-friction material film, the second sensing electrode and the second nano-friction material film are all equal in area.

[0014] Preferably, the shell is a hollow cylindrical structure, including an outer shell and a top cover, and the arc-shaped support block is fixedly installed inside the shell.

[0015] Preferably, the first nano-friction material film is a PMMA film, and the second nano-friction material film is a Kapton film.

[0016] Preferably, the beads are made of nanomaterials.

[0017] The technical solution provided by the present invention has the following beneficial effects: using the principles of friction power generation and electrostatic induction, based on the theory of friction nanogenerators, the vibration energy is converted into electrical energy to power the single-chip microcomputer, realizing the self-power supply and self-sensing of the sensor, reducing the dependence on external power supply, and effectively reducing the cost. At the same time, the collected vibration energy can power other small static parameter measuring devices; it can realize the measurement of the lateral vibration frequency and amplitude of the downhole drilling tool, when the following two situations occur:

[0018] 1) When drilling at a shallow depth, the lateral vibration output signal is collected;

[0019] 2) When the drilling depth reaches shallow wells or deep wells, the lateral vibration amplitude or frequency collected exceeds the normal working requirements of the drilling tool;

[0020] The single-chip microcomputer development board can be used to process alarms and monitor the working conditions of the drill. This sensor can measure the vibration frequency of the axial vibration of the drill while monitoring the lateral vibration, thus achieving multi-directional vibration data measurement and energy collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the self-powered sensor for downhole drilling tool vibration measurement and safety monitoring of the present invention;

[0022] Figure 2 AA cross-sectional schematic diagram of the self-powered sensor for downhole drilling tool vibration measurement and safety monitoring of the present invention;

[0023] Figure 3 This is a distribution diagram of arc-shaped surface sensing electrodes of a self-powered sensor for downhole drilling tool vibration measurement and safety monitoring of the present invention;

[0024] Figure 4 A schematic diagram of a self-powered sensor nano-friction material for downhole drilling tool vibration measurement and safety monitoring of the present invention;

[0025] Figure 5 This is a diagram showing the internal structure of a self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to the present invention;

[0026] Figure 6 An exploded diagram of a self-powered sensor for vibration measurement and safety monitoring of downhole drilling tools according to the present invention;

[0027] Figure 7 It is an overall schematic diagram of the self-powered sensor for downhole drilling tool vibration measurement and safety monitoring of the present invention;

[0028] In the figure:

[0029] 1-first acrylic plate; 2-first sensing electrode; 3-first nano-friction material film; 4-second acrylic plate; 5-housing; 6-small ball; 7-top cover; 8-sensing electrode group; 9-arc-shaped support block; 10-spring; 11-second sensing electrode; 12-second nano-friction material film. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] Please refer to Figure 1 , Figure 2 and Figure 6 An embodiment of the present invention provides a self-powered sensor for downhole drilling tool vibration measurement and safety monitoring, including a first acrylic plate 1, a first sensing electrode 2, a first nano-friction material film 3, a second acrylic plate 4, a second sensing electrode 11, a second nano-friction material film 12, a shell, a small ball 6, a sensing electrode group 8 and an arc-shaped support block 9.

[0032] The first nano friction material film is a PMMA film, and the second nano friction material film is a Kapton film;

[0033] The small balls are made of nanomaterials.

[0034] Please refer to Figure 1 and Figure 7 The housing is a closed insulating housing, which is installed on the downhole drilling tool and vibrates synchronously with the drilling tool. The housing is a hollow cylindrical body, specifically including a hollow cylindrical shell 5 with an upper opening and a top cover 7, and the top cover 7 covers the upper port of the shell 5 to seal the upper port of the shell 5.

[0035] Please refer to Figure 2 The arc-shaped support block 9 is fixed inside the housing 5, the sensing electrode group 8 is pasted on the surface of the arc-shaped support block 9, and the ball 6 is located at the center of the arc-shaped support block 9 and contacts the center sensing electrode of the sensing electrode group 8. When the drill bit vibrates, the ball swings left and right, contacts and separates from different sensing electrodes, and outputs signals.

[0036] Please refer to Figure 2 and Figure 3 The sensing electrode group 8 includes 5 annular sensing electrodes and 1 circular sensing electrode evenly distributed on the arc surface, the spacing between the sensing electrodes is equal, and the circular sensing electrode is located at the center of the arc surface.

[0037] Please refer to Figure 2 and Figure 5 The second acrylic plate 4 is connected to the bottom of the arc-shaped support block 9 through a spring 10. When the drill bit vibrates, the spring 10 vibrates up and down due to gravity and inertia. The second sensing electrode 11 and the second nano-friction material film 12 are pasted on the bottom surface, and the first nano-friction material film 3 on the first acrylic plate 1 at the bottom is contacted and frictionally charged. The spring 10 is evenly installed between the arc-shaped support block 9 and the second acrylic plate 4.

[0038] Please refer to Figure 4 The first sensing electrode 2 , the first nano-friction material film 3 , the second sensing electrode 11 and the second nano-friction material film 12 have the same area and diameter, and are all in the shape of a disk.

[0039] Please refer to Figure 2 and Figure 3 The above sensor is connected to the drill bit through the housing and vibrates synchronously with the drill bit. The actual working process is as follows:

[0040] 1. The induction electrodes in the induction electrode group 8 are connected to the I / O port of the single-chip microcomputer from the inside to the outside, and the single-chip microcomputer is grounded. When the drill tool vibrates laterally, the ball 6 rolls along the arc surface on the arc support block 9, rubbing against different induction electrodes in the induction electrode group 8, generating induced charges on the surface of the ball 6 and the induction electrode group 8, and then generating a potential difference, and this voltage signal is transmitted to the single-chip microcomputer. The ball 6 will rub against multiple induction electrodes under the action of vibration. Therefore, a program is downloaded into the single-chip microcomputer that can determine the highest induction electrode that the ball can rub against through the corresponding I / O port, and the lateral vibration amplitude is determined by the induction electrode corresponding to the highest bit of the output port. At the same time, the ball 6 will output a voltage every time it passes through the most central circular induction electrode. The time difference between the two voltage outputs is calculated by the single-chip microcomputer to obtain the frequency of the lateral vibration.

[0041] 2. Assume that in the actual working process, the lateral vibration amplitude requirement is that the rolling position of the ball 6 reaches the third sensing electrode. When the highest rolling position of the ball 6 is lower than the third sensing electrode, the sensor measures the amplitude and frequency normally. When the rolling position is higher than the third sensing electrode, the microcontroller will trigger an alarm while measuring the parameters, and the buzzer on the development board connected to the microcontroller will sound.

[0042] 3. The first acrylic plate 1, the first sensing electrode 2, the first nano-friction material film 3, the second acrylic plate 4, the second sensing electrode 11, and the second nano-friction material film 12 at the bottom of the sensor are in contact and separated under the action of the spring 10 and vibration. The two copper sensing electrodes (the first sensing electrode 2 and the second sensing electrode 11) are connected to the electrometer through wires, and the collected waveforms are transmitted to the PC software. During the axial vibration process, the first nano-friction material film 3 and the second nano-friction material film 12 are constantly in contact and separated, generating induced charges on their surfaces and forming a potential difference. The voltage waveform output during the entire working process is transmitted to the PC through the electrometer to calculate the axial vibration frequency.

[0043] The single chip microcomputer is connected to the sensing electrodes in each sensing electrode group 8. Here, the I / O interface of the single chip microcomputer is connected to each sensing electrode of the sensing electrode group 8 through a wire. The single chip microcomputer can detect the electrical signal generated on the sensing electrode group.

[0044] In this document, the directional words such as front, back, top, and bottom are defined by the positions of the components in the drawings and the positions of the components relative to each other, and are only for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application.

[0045] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-powered sensor for downhole drilling tool vibration measurement and safety monitoring, characterized in that: include: A first acrylic plate (1), a first sensing electrode (2), a first nano-friction material film (3), a second acrylic plate (4), a second sensing electrode (11), a second nano-friction material film (12), a shell, a small ball (6), a sensing electrode group (8), and an arc-shaped support block (9); The housing is connected to the drilling tool, the first acrylic plate (1) is installed at the bottom of the housing, and the first sensing electrode (2) and the first nano-friction material film (3) are arranged on the upper surface of the first acrylic plate (1) from bottom to top; The second acrylic plate (4) is located directly above the first acrylic plate (1), and the second sensing electrode (11) and the second nano-friction material film (12) are provided on the lower surface of the second acrylic plate (4) from top to bottom; The upper surface of the second acrylic plate (4) is connected to the arc-shaped support block (9) via a spring (10); the arc-shaped support block (9) is used to support the rolling of the small ball (6); and the sensing electrode group (8) is pasted on the surface in contact with the small ball (6); The sensing electrode group (8) is connected to a single-chip microcomputer. The small ball (6) slides under the vibration of the drill. The single-chip microcomputer collects the output signal of the sensing electrode group (8), and calculates the lateral vibration amplitude and frequency of the drill according to the position of the sensing electrodes in the sensing electrode group (8). At the same time, the second acrylic plate (4) connected to the arc-shaped support block (9) at the bottom of the sensing electrode group (8) vibrates up and down with the drill. The first nano-friction material film (3) and the second nano-friction material film (12) undergo friction electrification and electrostatic induction. The output signal is collected through electrostatic induction, and the axial vibration frequency of the drill is calculated.

2. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The sensing electrode group (8) comprises a plurality of sensing electrodes, each of which is evenly distributed and respectively connected to a plurality of I / O ports of the single chip computer.

3. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The height of the spring (10) needs to ensure that the first nano-friction material film (3) and the second nano-friction material film (12) are in contact in a static state.

4. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The first induction electrode (2) and the second induction electrode (11) are connected via an electrometer, and the frequency of the electrical signal generated by the friction between the first nano-friction material film (3) and the second nano-friction material film (12) is the axial vibration frequency of the drilling tool.

5. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The sensing electrode group (8) is in the shape of concentric rings, and the sensing electrode at the center is in the shape of a circle.

6. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The first acrylic plate (1), the first sensing electrode (2), the first nano-friction material film (3), the second acrylic plate (4), the second sensing electrode (11) and the second nano-friction material film (12) are all circular in shape, and the first sensing electrode (2), the first nano-friction material film (3), the second sensing electrode (11) and the second nano-friction material film (12) are all equal in area.

7. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The shell is a hollow cylindrical structure, comprising an outer shell (5) and a top cover (7), and the arc-shaped support block (9) is fixedly installed inside the shell.

8. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The first nano friction material film (3) is a PMMA film, and the second nano friction material film (12) is a Kapton film.

9. The self-powered sensor for downhole drilling tool vibration measurement and safety monitoring according to claim 1, characterized in that: The small balls (6) are made of nanomaterials.

Images