Drilling monitoring instrument based on array sensor

Abstract

The invention provides a drilling monitoring instrument and system based on array type sensors, and belongs to the field of array type displacement equipment.The drilling monitoring instrument is characterized in that the outer layer of a polyethylene pipe is sleeved with an alloy pipe, the outer layer of the alloy pipe is sleeved with a plastic spacer bush, and a grouting pipe and the polyethylene pipe sleeved with the alloy pipe and the plastic spacer bush are arranged in parallel; the array type sensor comprises a water pressure sensor, an inclination sensor and a stress sensor; the water pressure sensor is arranged at the position away from the bottom of a drill hole of the polyethylene pipe by a first preset distance and used for obtaining water pressure data of the drill hole. The inclination sensors are arranged into an array according to a second preset distance, are distributed in the polyethylene pipe and are used for acquiring displacement data of a drill hole; and the stress sensors are arranged into an array at a third preset distance, are distributed outside the polyethylene pipe and are used for acquiring stress data of the drill hole. According to the monitoring instrument, the early warning capability can be improved, and when large displacement occurs, the survival rate of deep displacement equipment is guaranteed to the maximum extent.

Description

Technical Field

[0001] The present application belongs to the field of array displacement equipment, and specifically relates to a drilling monitoring instrument based on array sensors. Background Art

[0002] For drilling monitoring instruments, traditional monitoring methods have the problem of single parameters. To monitor a certain parameter, drilling must be performed separately, which cannot reflect the mechanism of landslide formation. At the same time, in the existing technology, when cement slurry is used to fix deep displacement equipment and drilling stress gauges, the strength must be ensured while ensuring the permeability of the groundwater level gauge. How to isolate the cement slurry area and the water level sensor? When large displacement occurs, how to ensure the survival rate of the deep displacement equipment is the bottleneck of the existing technical means. Summary of the invention

[0003] In response to the shortcomings of the existing technology, this application proposes a drilling monitoring instrument based on array sensors, which can simultaneously monitor displacement, drilling pressure, and groundwater level. It can be connected to a remote monitoring platform for multi-parameter correlation analysis, study the mechanism of landslide formation, improve early warning capabilities, and reduce the risk of landslide disasters. At the same time, when large displacement occurs, the survival rate of deep displacement equipment is maximized.

[0004] The present application proposes a drilling monitoring instrument based on an array sensor, comprising: a polyethylene pipe, a plastic spacer, an alloy pipe, a grouting pipe and an array sensor;

[0005] The outer layer of the polyethylene pipe is covered with an alloy pipe, and the outer layer of the alloy pipe is covered with a plastic spacer. The grouting pipe and the polyethylene pipe covered with the alloy pipe and the plastic spacer are placed side by side. The array sensor includes a water pressure sensor, a tilt sensor, and a stress sensor.

[0006] The water pressure sensor is arranged at a first preset distance from the bottom of the borehole of the polyethylene pipe, and is used to obtain water pressure data of the borehole;

[0007] The tilt sensors are arranged in an array at a second preset distance and distributed inside the polyethylene pipe to obtain displacement data of the borehole;

[0008] The stress sensors are arranged in an array at a third preset distance and distributed outside the polyethylene pipe to obtain stress data of the borehole.

[0009] The polyethylene pipe comprises: a polyethylene pipe on the ground and a polyethylene pipe under the ground, and the length of the polyethylene pipe on the ground is greater than 1 meter.

[0010] Marking points are arranged on the polyethylene pipe on the ground, and the marking points are used to set the direction of the drilling monitoring instrument.

[0011] The polyethylene pipe under the ground has multiple sections, and each section of the polyethylene pipe under the ground is connected by a flexible joint.

[0012] The tilt sensor is packaged with a stainless steel mesh, and the array of the tilt sensor is inserted into a polyethylene pipe under the ground.

[0013] The stress sensors are evenly clamped and installed on the polyethylene pipe under the ground, and the arrangement direction of the stress sensors is opposite to the main sliding direction.

[0014] The end of the polyethylene pipe under the ground is sealed with a plug, and a sealing bag is arranged below the plug. The sealing bag is made of gauze, and fine sand and the water pressure sensor are filled in the gauze.

[0015] A borehole monitoring instrument based on an array sensor also includes: a ground collection station;

[0016] The ground collection station at least includes: a first data collector and a second data collector;

[0017] The first data collector is used to collect the water pressure data of the borehole transmitted from the water pressure sensor in the borehole monitoring instrument based on the array sensor and the displacement data of the borehole transmitted from the tilt sensor;

[0018] The second data collector is used to collect the stress data of the borehole transmitted by the stress sensor in the borehole monitoring instrument based on the array sensor;

[0019] The ground collection station is used to upload all collected data to the cloud platform in real time via a wireless network.

[0020] Beneficial effects:

[0021] The present application proposes a drilling monitoring instrument based on an array sensor, which has the following beneficial effects:

[0022] 1. High strength: The application of aluminum alloy tubes and plastic spacers significantly improves the compressive and tensile resistance of the equipment, ensuring the long-term and stable operation of the borehole monitoring instrument based on array sensors in frozen soil environments.

[0023] 2. High precision: The circuit design of the measuring unit with built-in high-precision sensor can theoretically achieve millimeter-level precision measurement of sliding body deformation.

[0024] 3. Large range: The structural design in which the rigid rods are connected by flexible energy-absorbing components ensures that the large displacement of the sliding belt is concentrated on the flexible joints, and the measuring unit only undergoes rigid tilt. In theory, this monitoring technology can achieve large-scale measurement of the sliding belt displacement at the meter level.

[0025] 4. Easy to install: The modular design greatly simplifies the installation process and reduces the cost and difficulty of engineering construction.

[0026] 5. Low cost: No external power supply equipment and complex wiring are required, and the overall cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the appearance of a drilling monitoring instrument based on an array sensor according to an embodiment of the present application;

[0028] Figure 2 An internal schematic diagram of a drilling monitoring instrument based on an array sensor according to an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the internal structure of a drilling monitoring instrument based on an array sensor according to an embodiment of the present application;

[0030] Figure 4 An enlarged view of the bottom area A of the drilling monitoring instrument based on the array sensor according to an embodiment of the present application;

[0031] Figure 5 Schematic diagram of installation of a drilling monitoring instrument based on an array sensor according to an embodiment of the present application;

[0032] Figure 6 Wiring diagram of the tilt sensor of the embodiment of the present application;

[0033] Figure 7 Wiring diagram of the stress sensor according to the embodiment of the present application;

[0034] Figure 8 Wiring diagram of the water pressure sensor in the embodiment of the present application;

[0035] Fig. 9 Wiring schematic diagram of a drilling monitoring instrument based on an array sensor according to an embodiment of the present application.

[0036] Among them, 11-hole clamp 12-cable 13-grouting pipe 14-MARK point, 15-flexible joint, 21-tilt sensor, 22-alloy tube, 23-silicone, 24-four-core cable, 25-plastic spacer, 26-water pressure sensor, 27-sealing bag, 28-polyethylene tube, 29-stress sensor, 61-cable of tilt sensor, 62-cable of stress sensor, 63-tail cable of water pressure sensor, 64-compensation length, 66-ground plane, 68-2 plug, 68-3 internal tail cable of water pressure sensor, 69-first data collector, 70-second data collector. DETAILED DESCRIPTION

[0037] The specific implementation of the present application is further described in detail below in conjunction with the drawings and examples.

[0038] The present application proposes a borehole monitoring instrument based on an array sensor, in order to develop a deep hole multi-parameter integrated measurement system, study the formation mechanism of landslides, and the relationship between groundwater level, borehole stress and deep borehole displacement. The main technical features of the borehole monitoring instrument based on the array sensor are: ① The outer surface of the sensor is coated with a high-strength stainless steel woven mesh, which has extremely high tensile strength, adopts an overall waterproof sealing structure, and can work in various harsh environments; ② The Mark mark (i.e., MARK point 14) is used to continuously and accurately measure the displacement deformation of the entire device coverage area, and the buried installation is simple, without the need to control the direction, and without the need to use an inclinometer with a guide groove. Whether it is vertical, horizontal or inclined, it is only necessary to insert the sensor as a whole into the pre-buried casing or directly bury it in the reserved backfill trench. Because there is no need to use an inclinometer with a guide groove, the weight of the monitoring instrument is greatly reduced; ③ In principle, it overcomes various technical defects existing in the engineering application of active inclinometer products, such as high cumulative manual monitoring intensity, insufficient automated monitoring function, complex installation method, and limited number of measurement points. ④ When large displacement occurs, the drilling monitoring instrument based on array sensors can maximize the survival rate of deep displacement equipment.

[0039] Example:

[0040] This embodiment proposes a drilling monitoring instrument based on an array sensor, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, it includes: a polyethylene tube 28, a plastic spacer 25, an alloy tube 22, a grouting tube 13 and an array sensor;

[0041] The outer layer of the polyethylene tube 28 is covered with an alloy tube 22, and the outer layer of the alloy tube 22 is covered with a plastic spacer 25. The grouting tube 13 and the polyethylene tube 28 covered with the alloy tube 22 and the plastic spacer are placed in parallel. The array sensor includes a water pressure sensor 26, a tilt sensor 21, and a stress sensor 29;

[0042] The water pressure sensor 26 is disposed at a first preset distance from the bottom of the borehole of the polyethylene tube 28 and is used to obtain water pressure data of the borehole;

[0043] The tilt sensors 21 are arranged in an array at a second preset distance and distributed inside the polyethylene pipe 28 to obtain displacement data of the borehole;

[0044] The stress sensors 29 are arranged in an array at a third preset distance and distributed outside the polyethylene pipe 28 to obtain stress data of the borehole.

[0045] In this embodiment, the alloy tube 22 can be an aluminum alloy tube 22, and the polyethylene tube 28 can be a 32PE tube.

[0046] The polyethylene pipe 28 includes: a polyethylene pipe on the ground and a polyethylene pipe under the ground, and the length of the polyethylene pipe on the ground is greater than 1 meter.

[0047] In this embodiment, a compensation length 64 is pre-set, and the length of the polyethylene tube on the ground is greater than 1 meter to ensure that the equipment is not broken. An orifice clamp 11 is set at the end of the compensation length 64. A sensor cable 12 is provided inside the polyethylene tube 28. Among them, a cable 61 of a tilt sensor is provided inside the polyethylene tube 28, and a silicone rubber 23 is provided at the end of the polyethylene tube 28. The cable 61 of the tilt sensor is a four-core cable 24, and a cable 62 of a stress sensor and a tail cable 63 of a water pressure sensor are provided outside the polyethylene tube 28.

[0048] A marking point (MARK point 14) is arranged on the polyethylene pipe on the ground (ie above the ground level 66), and the marking point (MARK point 14) is used to set the direction of the drilling monitoring instrument.

[0049] In this embodiment, since marking points are provided on the polyethylene pipe on the ground, the orientation of the drilling monitoring instrument can be set by using the marking points, so there is no need to use an inclinometer tube with a guide groove, which greatly reduces the weight of the monitoring instrument.

[0050] The polyethylene pipe under the ground has multiple sections, and each section of the polyethylene pipe under the ground is connected by a flexible joint 15.

[0051] In this embodiment, each measuring unit is composed of a rigid rod (i.e., a polyethylene tube 28) and a flexible joint 15, wherein the flexible joint 15 is a flexible energy-absorbing component. The large displacement of the sliding belt is concentrated on the flexible joint 15, and the measuring unit only undergoes rigid tilt. Theoretically, this monitoring technology can realize large-scale measurement of the sliding belt displacement at the meter level.

[0052] The tilt sensor 21 is packaged with a stainless steel mesh, and the array of the tilt sensor is inserted into a polyethylene pipe under the ground.

[0053] In this embodiment, the tilt sensor 21 is a deep displacement sensor, which adopts a MEMS tilt measurement unit sensor array. Each sensor contains a three-axis high-precision MEMS tilt sensor and communicates through a four-wire interface. Not only does it ensure power supply, but it can also achieve multi-point distributed measurement. The operating range of the sensor is -55°C to +125°C, and the tilt measurement accuracy can reach ±0.001°, which is suitable for high-precision tilt monitoring in harsh environments. The MEMS sensor array is packaged with a thickened stainless steel mesh to improve the axial tensile strength. The MEMS sensor array is inserted into a 32PE pipe to improve the waterproof and shear resistance of the equipment. At the same time, it can ensure that when a large displacement occurs, it can slide axially in the PE pipe. The tilt sensor 21 is not fixed in the PE pipe, which provides redundant space for relative sliding to achieve a large range, and provides basic conditions for a large range.

[0054] The stress sensors 29 are evenly clamped and installed on the polyethylene pipe 28 under the ground, and the arrangement direction of the stress sensors 29 is opposite to the main sliding direction.

[0055] In this embodiment, the main sliding direction is not determined, and it is determined in combination with the on-site conditions. The main sliding direction is a random variable, and no special agreement is made in this embodiment. The stress sensor 29 is a borehole stress sensor: a vibrating string stress sensor array is adopted, which consists of a vibrating string sensor with spot-welded anchor plates at both ends and a protective cover containing a temperature sensor and an excitation coil. The excitation method is plucking or sweeping, and the operating temperature range is -40°C to +80°C. It is mainly used for monitoring structural strain. It is also widely used in pole towers, bridges, steel cables, oil and gas pipelines and other occasions where arc welding is inconvenient. The borehole pressure sensor is installed on the 32PE pipe (i.e., polyethylene pipe 28) through a clamp, and a number of hole stress sensors are evenly arranged in each hole. The arrangement direction of the hole stress sensor is: facing away from the main sliding direction. The sensor adopts a vibrating string sensor, and the inside of the 75PVC pipe is fully grouted.

[0056] The end of the polyethylene pipe 28 under the ground is sealed with a plug 68 - 2 , and a sealing bag 27 is arranged below the plug 68 - 2 . The sealing bag 27 is made of gauze, and fine sand and the water pressure sensor 26 are filled in the gauze.

[0057] In this embodiment, the water pressure sensor 26 adopts a ceramic capacitor pressure sensitive sensor with a filter stone aperture of 50 to 60 μm and an operating temperature of -40°C to +85°C. It has strong anti-interference ability, small temperature drift and zero drift, little influence of electrical parameters, and stable and reliable performance. The main components are made of special steel and have perfect cable protection measures, which can adapt to long-term observation and long-distance testing under harsh conditions. A high MEMS sensor array is used, combined with special packaging to ensure accuracy while improving the tensile and shear strength of the structure. Reduce damage when large displacements occur. A pressure-resistant and corrosion-resistant vibrating string sensor is used, and special sealing and protection measures are adopted. The structure converts radial positive stress into axial tensile stress, which can correctly respond to drilling stress when space is limited. The water pressure sensor 26 is packaged in a bag to ensure the water permeability of the sensor area.

[0058] The plug 68-2 under the polyethylene tube 28 is used for sealing. Gauze is used to make a sealing bag 27 under the plug 68-2. The sealing bag 27 contains fine sand, a water pressure sensor 26, and an internal tail cable 68-3 of the water pressure sensor. The sealing bag 27 is lowered to the flower hole position at the bottom of the 75pvc pipe along with the 32pe pipe. The cable of the water pressure sensor is fixed to the hole mouth with a cable tie along the outer wall of the 32pe pipe. When the sealing bag 27 is at the bottom of the hole, under the action of gravity, the bag fits with the hole wall, and the groundwater penetrates into the sensor inside the fine sand through the flower hole. At the same time, the bag can isolate the grouting liquid to prevent the slurry from flowing onto the water pressure sensor 26 and making it ineffective.

[0059] A borehole monitoring instrument based on an array sensor, such as Figure 6 , Figure 7 , Figure 8 , Fig. 9 As shown, it also includes: a ground collection station;

[0060] The ground collection station at least includes: a first data collector 69 and a second data collector 70;

[0061] The first data collector 69 is used to collect the borehole water pressure data transmitted from the water pressure sensor 26 in the borehole monitoring instrument based on the array sensor and the borehole displacement data transmitted from the tilt sensor 21;

[0062] The second data collector 70 is used to collect the stress data of the borehole transmitted by the stress sensor 29 in the borehole monitoring instrument based on the array sensor;

[0063] The ground collection station is used to upload all collected data to the cloud platform in real time via a wireless network.

[0064] In order to prove the effectiveness of this embodiment, two examples are listed, both of which use the drilling monitoring instrument based on array sensors described in the embodiment;

[0065] Example 1:

[0066] A 100m long sensor array was arranged in the slope area of ​​a certain open-pit mine dump. The spacing between MEMS tilt sensors was 4m, the spacing between stress sensors 29 was 20m, and a water pressure sensor 26 was placed 15m from the bottom of the borehole. A total of 31 sensors of various types were arranged. The ground collection station uploaded the collected data to the cloud platform in real time through a wireless network. After 6 months of monitoring, the borehole monitoring instrument based on array sensors operated stably and transmitted data accurately within the temperature range of -33℃ to +12℃, and the internal structure of the sensor machine was not damaged.

[0067] Example 2:

[0068] An 85-meter-long sensor array was arranged on a large ancient landslide slope. The MEMS tilt sensors were spaced 5 meters apart, the stress sensors 29 were spaced 20 meters apart, and the water pressure sensors 26 were placed 15 meters from the bottom of the borehole. A total of 18 sensors of various types were arranged. The array was installed in the borehole, and data was collected and remotely monitored through the ground acquisition station. The borehole monitoring instrument based on the array sensor performed stably during the 6-month test period, providing high-precision multi-physics field soft rock deformation data, supporting the analysis work of scientific researchers.

[0069] The various embodiments in the present application are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0070] The protection scope of the present application is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the scope and spirit of the present disclosure. If these changes and modifications fall within the scope of the claims of the present disclosure and their equivalents, the intention of the present disclosure also includes these changes and modifications.

Claims

1. A drilling monitoring instrument based on an array sensor, characterized in that: include: Polyethylene pipes, plastic sleeves, alloy pipes, grouting pipes and array sensors; The outer layer of the polyethylene pipe is covered with an alloy pipe, and the outer layer of the alloy pipe is covered with a plastic spacer. The grouting pipe and the polyethylene pipe covered with the alloy pipe and the plastic spacer are placed side by side. The array sensor includes a water pressure sensor, a tilt sensor, and a stress sensor. The water pressure sensor is arranged at a first preset distance from the bottom of the borehole of the polyethylene pipe, and is used to obtain water pressure data of the borehole; The tilt sensors are arranged in an array at a second preset distance and distributed inside the polyethylene pipe to obtain displacement data of the borehole; The stress sensors are arranged in an array at a third preset distance and distributed outside the polyethylene pipe to obtain stress data of the borehole.

2. The drilling monitoring instrument based on array sensors according to claim 1, characterized in that: The polyethylene pipe comprises: a polyethylene pipe on the ground and a polyethylene pipe under the ground, and the length of the polyethylene pipe on the ground is greater than 1 meter.

3. The drilling monitoring instrument based on array sensors according to claim 2, characterized in that: Marking points are arranged on the polyethylene pipe on the ground, and the marking points are used to set the direction of the drilling monitoring instrument.

4. The drilling monitoring instrument based on array sensors according to claim 2, characterized in that: The polyethylene pipe under the ground has multiple sections, and each section of the polyethylene pipe under the ground is connected by a flexible joint.

5. The drilling monitoring instrument based on array sensors according to claim 1, characterized in that: The tilt sensor is packaged with a stainless steel mesh, and the array of the tilt sensor is inserted into a polyethylene pipe under the ground.

6. The drilling monitoring instrument based on array sensors according to claim 1, characterized in that: The stress sensors are evenly clamped and installed on the polyethylene pipe under the ground, and the arrangement direction of the stress sensors is opposite to the main sliding direction.

7. The drilling monitoring instrument based on array sensors according to claim 1, characterized in that: The end of the polyethylene pipe under the ground is sealed with a plug, and a sealing bag is arranged below the plug. The sealing bag is made of gauze, and fine sand and the water pressure sensor are filled in the gauze.

8. The drilling monitoring instrument based on array sensors according to claim 1, characterized in that: The array sensor-based drilling monitoring instrument further includes: a ground collection station; The ground collection station at least includes: a first data collector and a second data collector; The first data collector is used to collect the water pressure data of the borehole transmitted from the water pressure sensor in the borehole monitoring instrument based on the array sensor and the displacement data of the borehole transmitted from the tilt sensor; The second data collector is used to collect the stress data of the borehole transmitted by the stress sensor in the borehole monitoring instrument based on the array sensor; The ground collection station is used to upload all collected data to the cloud platform in real time via a wireless network.

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