Orifice pipe plugging system and method based on water flow perception and slurry cooperative regulation and control

Abstract

The invention discloses an orifice pipe plugging system and method based on water flow sensing and slurry cooperative regulation and control, and relates to the technical field of soil layer or rock drilling, the plugging system comprises: a light-guide fiber sensor arranged on the outer wall surface of an orifice pipe and used for detecting the dependent variable caused by water flow pressure around the orifice pipe in real time; the slurry bags comprise a plurality of slurry bags with different proportions, the slurry bags are wrapped and fixed on the outer wall surface of the drill rod, and electric control valves are arranged at outlets of the slurry bags; the central receiving and control unit is used for calculating water flow according to the collected dependent variables around the orifice pipe, releasing slurry in the slurry bags with corresponding proportions according to different water flows, and blocking the orifice pipe; according to the plugging system, through integration of the optical fiber sensor, intelligent regulation and control and multiple slurry materials, the change of water flow can be sensed in real time, automatic slurry regulation and control can be carried out, and therefore it is ensured that the plugging effect is stable and lasting.

Description

Technical Field

[0001] The present invention relates to the technical field of soil layer or rock drilling, and in particular to a hole pipe plugging system and method based on water flow sensing and slurry coordinated regulation. Background Art

[0002] When drilling in water-rich strata, groundwater and formation water will continue to gush out as the drilling depth increases, which brings many troubles to the grouting site and easily delays the construction period. In order to prevent a large amount of water in the stratum from gushing out from the drilling hole, at present, in order to prevent the sudden water from affecting the on-site construction, an orifice pipe will be set before drilling and a valve will be installed on it to achieve timely control of the sudden water.

[0003] In reality, due to the complexity and non-visual characteristics of water-rich strata, the water flow rate will be in dynamic change due to the presence of grouting holes in the strata under the action of surrounding pressure. When the dynamic water flow rate suddenly increases, it is easy to cause the orifice pipe that is not fastened to the rock formation to pop out, causing the outer wall of the orifice pipe and the rock wall to form a sudden water gushing channel, destroying the orifice pipe's control over the water volume.

[0004] Looking at the fixation of the orifice pipe during the grouting process, the common fixing methods currently include mechanical fixation, anchoring system, external support, etc., and they often have limitations. Mechanical fixation requires professional operation during installation, and the process is relatively cumbersome. Installation and adjustment take a long time, affecting the construction progress, and stress concentration problems often occur during mechanical fixation. Liquid leakage and slurry running occur during the grouting process, and mechanical fixation is difficult to achieve stability in the sand layer; the anchoring system requires special equipment and tools, which will increase the construction capital investment. In the grouting of the sand layer, the low strength of the sand layer soil, insufficient friction and pore water pressure have a great impact on the anchoring system, making the anchoring effect invalid; external support will take up a large amount of construction space on the face, restricting the progress of other operations and reducing work efficiency. If there are large changes in water flow, it is difficult to adjust quickly. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a orifice pipe plugging system and method based on water flow sensing and coordinated regulation of slurry. During the drilling process, the orifice pipe is plugged by sensing the water flow and coordinated regulation of slurry, thereby ensuring the stability and durability of the plugging effect. This method can demonstrate excellent adaptability and efficiency in grouting projects in complex geological environments and water-rich formations.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the present invention, a orifice pipe plugging system based on water flow sensing and slurry coordinated regulation is provided, comprising:

[0008] The optical fiber sensor is arranged on the outer wall of the orifice pipe and is used to detect the strain around the orifice pipe caused by the water flow pressure in real time;

[0009] Slurry bags, including a plurality of slurry bags with different proportions, the slurry bags are wrapped and fixed on the outer wall surface of the drill pipe, and an electric control valve is arranged at the outlet of the slurry bag;

[0010] The central receiving and control unit calculates the water flow rate based on the collected water flow pressure around the orifice pipe, releases the slurry in the corresponding proportion slurry bag according to different water flow rates, and blocks the orifice pipe.

[0011] In some embodiments of the present invention, a plurality of optical fiber sensors are provided, and the probes of the plurality of optical fiber sensors are spaced apart and distributed on the outer wall surface of the orifice tube and fixed by epoxy resin or optical fiber glue.

[0012] In some embodiments of the present invention, the optical fiber signal transmission line of the optical fiber sensor is connected to a central receiving and control unit, and the central receiving and control unit receives and processes the optical fiber signal.

[0013] In some embodiments of the present invention, the plurality of slurry bags with different ratios are respectively filled with cement slurry with a water-cement ratio of 0.6-0.7, cement slurry with a water-cement ratio of 0.8-0.9, cement slurry with a water-cement ratio of 1-1.3 and water glass.

[0014] In some embodiments of the present invention, the electric-controlled valve is connected to a wireless signal receiving control unit, and the wireless signal receiving control unit starts a blocking procedure according to a set maximum water flow threshold.

[0015] In a second aspect of the present invention, a method for plugging an orifice pipe based on water flow sensing and slurry coordinated regulation is provided, comprising:

[0016] An optical fiber sensor is used to detect the strain around the orifice pipe caused by the water flow pressure in real time, and the water flow around the orifice pipe is obtained according to the strain.

[0017] When the water flow exceeds the set maximum water flow threshold, the plugging program is started, and slurry bags with different ratios are opened for plugging according to different water flow rates.

[0018] In some embodiments of the present invention, the water flow rate around the orifice pipe is obtained according to the strain, specifically by the following formula:

[0019]

[0020] Where: ε-strain measured by the optical fiber sensor; P-pressure of water flow on the inner wall of the orifice pipe; D-outer diameter of the orifice pipe; E-Young's modulus of the pipeline material; t-wall thickness of the orifice pipe; v-flow velocity of water; ρ-density of water; R is the diameter of the grouting hole.

[0021] In some embodiments of the present invention, the maximum water flow threshold is set according to on-site construction conditions.

[0022] In some embodiments of the present invention, the blocking procedure comprises the following steps:

[0023] When the plugging conditions are met, cement slurry with a water-cement ratio of 1-1.3 is first injected, while the water flow rate is monitored in real time;

[0024] When the water flow rate remains constant, injection with the current slurry is continued to fill the cracks and form a preliminary seal;

[0025] When the water flow rate increases by 1-5m 3 / h range, switch to cement slurry with a water-cement ratio of 0.8-0.9 for plugging;

[0026] When the increase in water flow is greater than 5m 3 / h, switch to water glass for plugging until the water flow stabilizes or decreases, switch to cement slurry with the previous water-cement ratio, and gradually reduce the injection ratio of water glass until the plugging is completed.

[0027] In some embodiments of the present invention, after the plugging is completed, the water flow change continues to be monitored to confirm whether the water flow will still pass through the gap between the outer wall of the orifice pipe and the rock bed to determine the plugging effect. If the monitoring results show that no water flows through, it indicates that the plugging effect has achieved the expected effect.

[0028] One or more technical solutions of the present invention have the following beneficial effects:

[0029] (1) The present invention proposes to sense water flow and coordinate slurry control during drilling to plug the orifice pipe, which can demonstrate excellent adaptability and efficiency in grouting projects in complex geological environments and water-rich formations. The system integrates optical fiber sensing, intelligent control and a variety of slurry materials to sense changes in water flow in real time and perform automated slurry control, thereby ensuring a stable and lasting plugging effect.

[0030] (2) The system provided by the present invention can sense the water flow in real time and accurately grasp the dynamic parameters of the water flow velocity and pressure. In the actual construction process, the water flow changes are complex and difficult to predict, especially in water-rich formations. The sudden increase in water flow may cause impact damage to the orifice pipe, causing the orifice pipe to detach from the rock wall, thereby causing disasters such as sudden water and mud that have a great impact on the construction. Through the real-time feedback of the optical fiber sensor, the system can timely obtain the strain information brought by the water flow and transmit the data to the control unit, thereby realizing the precise control of the slurry. This intelligent perception and control capability effectively prevents the failure of the pre-drilling plugging caused by the sudden increase in water flow, provides a reliable guarantee for construction safety, and also replaces the pre-drilling orifice pipe sealing process, greatly shortening the time of the entire grouting process, and greatly improving the construction efficiency.

[0031] (3) The present invention achieves flexible grouting and plugging by coordinated regulation of different types of slurries. The system has multiple slurry configurations, cement slurries and water glass slurries with different ratios, which can be used in combination according to different geological conditions and water flow changes. By detecting the water flow data, the cement slurry is released to form a cement slurry with a water-cement ratio of 0.8-0.9 or a water-cement ratio of 1-1.3 with the water flow in the hole. The cement slurry with a water-cement ratio of 0.8-0.9 is suitable for reinforcing the structure around the orifice pipe in the later stage of plugging to form a solid supporting layer; the cement slurry with a water-cement ratio of 1-1.3 has good fluidity and is suitable for initial filling of cracks or pore areas. Water glass causes rapid solidification characteristics and is suitable for emergency plugging. Through the intelligent control system, the release speed and type of the slurry can be automatically adjusted with the change of water flow, which greatly improves the reliability and flexibility of the plugging effect.

[0032] (4) The automated control of the plugging system of the present invention significantly reduces manual intervention, and reduces the difficulty and cost of construction. Traditional plugging methods usually require continuous monitoring and operation by professionals, and the pulling of grouting pipelines and preparations before grouting waste a lot of time, resulting in cumbersome plugging and low plugging efficiency; while this system can automatically make decisions based on real-time data, thereby reducing dependence on on-site construction personnel, shortening construction time, and improving construction efficiency. At the same time, it can accurately control the release amount and flow rate of the slurry, without the need to adjust the slurry ratio on site, and effectively reduce material waste and optimize resource utilization.

[0033] (5) The plugging method provided by the present invention combines multi-level plugging with rapid emergency plugging, and the system ensures the long-term stability of the construction area. When the water flow rate suddenly increases, the system can quickly inject water glass to achieve emergency plugging, thereby effectively controlling the water flow and preventing damage to the orifice pipe and the formation. After the plugging is completed, the plugging area is reinforced by cement slurry with different ratios, which improves the overall durability and stability of the structure and reduces the need for subsequent maintenance.

[0034] (6) The present invention integrates the advantages of intelligent monitoring, automatic control and multi-slurry combination. Slurry bags with various ratios can be flexibly combined to meet the plugging needs under different geological conditions. It is particularly suitable for water-rich layers, sand layers and other environments. It provides a stable and efficient plugging solution in complex geological environments, significantly improving the safety, reliability and economy of construction, and has broad engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the orifice pipe plugging system based on water flow sensing and slurry coordinated regulation of the present invention;

[0036] Figure 2 This is a distribution structure diagram of the slurry bags on the drill pipe of the present invention;

[0037] Figure 3 The present invention is a flow chart of the orifice pipe plugging method based on water flow sensing and slurry coordinated regulation.

[0038] In the figure: 1. orifice tube; 2. epoxy resin or optical fiber glue; 3. optical fiber sensor; 4. surrounding rock; 5. pores between surrounding rock and orifice tube; 6. slurry bag; 601. first slurry bag; 602. second slurry bag; 603. water glass slurry bag; 7. drill bit; 8. drill rod; 9. optical fiber signal transmission line; 10. central receiving and control unit; 11. signal control line; 12. wireless receiving signal control unit; 13. electric control valve; 14. electric control hydraulic system. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] Example 1

[0041] In a typical embodiment of the present invention, a orifice pipe plugging system based on water flow sensing and slurry coordinated regulation is proposed, such as Figure 1 and Figure 2 As shown, including:

[0042] The optical fiber sensor 3 is arranged on the outer wall of the orifice pipe 1 and is used to detect the strain caused by the water flow pressure around the orifice pipe 1 in real time;

[0043] The slurry bag 6 includes a plurality of slurry bags 6 with different proportions, the slurry bag 6 is wrapped and fixed on the outer wall surface of the drill pipe 8, and an electric control valve 13 is arranged at the outlet of the slurry bag 6;

[0044] The central receiving and control unit 10 calculates the water flow rate according to the collected strain around the orifice pipe 1 , releases the slurry in the corresponding proportion slurry bag 6 according to different water flow rates, and blocks the orifice pipe 1 .

[0045] In this embodiment, the optical fiber sensors are arranged in plurality, and the probes of the optical fiber sensors are spaced apart on the outer wall of the orifice pipe and fixed by epoxy resin or optical fiber glue 2. The epoxy resin or optical fiber glue is high-strength and water-resistant, and it is necessary to ensure that the glue can be stable in water for a long time and will not be washed off by the water flow. Shockproof treatment is also required during the drilling process, and a shockproof layer such as a rubber pad is added during the installation process to reduce the interference of the vibration caused by the drill rod on the sensor. Since the optical fiber has the advantages of high-speed transmission, large bandwidth, strong anti-interference ability, good confidentiality, corrosion resistance, light weight, small size and reasonable price, it is applied to the intelligent perception of the water flow of the orifice pipe, which can realize the intelligent detection of the water flow of the orifice pipe.

[0046] During the drilling process of water-rich strata, when the drill bit 7 drills into the water-rich area, the sudden increase in water flow will flow into the pore 5 between the surrounding rock and the orifice pipe, causing impact damage to the orifice pipe and causing the orifice pipe to detach from the rock wall, thereby causing disasters such as sudden water and mud that have a great impact on the construction. By arranging an optical fiber sensor on the outer wall of the orifice pipe, it is possible to monitor whether water flows between the outer wall of the orifice pipe and the surrounding rock, thereby performing a plugging procedure; during the plugging process, the released slurry will flow into the space between the outer wall of the orifice pipe and the surrounding rock with the water flow, thereby realizing the plugging process; considering that when the corresponding slurry solidifies, the strain frequency transmitted by the optical fiber sensor becomes lower, a plurality of optical fiber sensors are arranged, and the plurality of optical fiber sensors are referenced in sequence along the water flow direction.

[0047] The working principle of the optical fiber sensor is: when the water flows on the outer wall of the orifice tube, it exerts pressure on it, and this pressure causes elastic deformation of the orifice tube wall. The optical fiber sensor indirectly reflects the pressure of the water flow on the tube wall by detecting the strain ε of the tube wall, that is:

[0048]

[0049] According to the transformation of Bernoulli equation, the water flow rate can be obtained:

[0050]

[0051] The flow rate Q is the product of the water velocity v and the effective flow cross-sectional area A of the outer wall of the orifice pipe:

[0052] Q=A·v

[0053]

[0054] Where: ε-strain measured by the optical fiber sensor; P-pressure of water flow on the inner wall of the orifice pipe (unit: Pa); D-outer diameter of the orifice pipe (unit: m); E-Young's modulus of the pipe material (unit: Pa); t-wall thickness of the pipe; v-flow rate of water; ρ-density of water (usually 1000kg / m 3 ), R is the diameter of the grouting hole.

[0055] In this embodiment, the optical fiber signal transmission line 9 of the optical fiber sensor is connected to the central receiving and control unit 10, and the optical fiber signal transmission line 9 is waterproofed and a waterproof connector is used at the interface. The signal transmission line is uniformly wired to the outside of the orifice pipe to ensure that the data of all sensors can be gathered to the control system. The signal transmission line is waterproofed to prevent water from entering the line and causing data loss or damage. A waterproof connector should be used at the interface of the optical fiber sensor to ensure that water cannot penetrate into the connector part. When the water flow is small, a signal amplifier can be installed at the optical fiber outlet to ensure that there is no attenuation and distortion when the data is transmitted to the control system, ensuring the system's real-time response capability to the water flow.

[0056] In this embodiment, the slurry bag 6 is an annular bag, and slurry bags of different proportions are attached to the front and back of the drill rod in sequence. Figure 2 As shown, the first slurry bag 601, the second slurry bag 602 and the water glass slurry bag 603 are fixed on the drill rod in turn by high-strength, water-resistant epoxy resin glue, and the slurries of different proportions have different outlets. The slurry bag will not collide with the orifice tube, and the diameter of the orifice tube is generally much larger than the diameter of the drill rod; when the slurry bag 6 is grouting, the slurry bag is squeezed by the set electric control hydraulic system 14 to achieve grouting, and at the same time, an electric control valve 13 is set at the outlet of each slurry bag to adjust the flow rate and flow rate of grouting. In a specific implementation of this embodiment, the slurry bags of different proportions are cyclically attached to the front and back of the drill rod in turn. Since the length of the drill rod is greater than the length of the orifice tube, when the drill rod is drilled to different positions, the slurry bag leaks out of the orifice tube, thereby achieving the release of the slurry belt.

[0057] In this embodiment, the plurality of slurry bags with different proportions are respectively filled with cement slurry and water glass with different water-cement ratios, wherein the water-cement ratio can be determined according to actual conditions, and the general water-cement ratio range is 0.6-1.3.

[0058] Among them, the functions of different slurries are as follows:

[0059] Cement slurry with a water-cement ratio of 0.6-0.7: The viscosity is high, and the slurry has strong stability and cohesion, which is suitable for the later reinforcement stage of the plugging process. A stable plugging layer is formed on the outer wall of the orifice pipe and the rock wall, which can effectively prevent the scouring and leakage of the plugging layer due to high-pressure water flow, and at the same time enhance the supporting performance of the orifice pipe. It is suitable for long-term plugging in high water pressure or water and mud burst environments.

[0060] Cement slurry with a water-cement ratio of 0.8-0.9: The fluidity and stability of cement slurry are balanced, which can maintain a certain permeability and have good coagulation performance, and is suitable for the mid-stage of grouting. This type of slurry can be used to fill medium cracks or pore areas to form a compact initial plugging layer. In the case of large water flow changes, it can provide a good plugging effect and further provide a basis for subsequent reinforcement grouting.

[0061] Cement slurry with a water-cement ratio of 1-1.3: has good fluidity and strong permeability, and is suitable for the initial stage of the plugging process, especially for larger cracks or pores between the orifice pipe and the rock wall. This type of slurry can quickly penetrate deep into the cracks, fill and distribute evenly, providing a good basic condition for plugging. Under low water pressure conditions or in the initial grouting stage, it can improve the uniformity of slurry distribution and avoid dead corners or leakage.

[0062] Water glass: Due to its rapid solidification characteristics, the use of water glass can quickly form a gelling layer when the water flow suddenly increases, achieving emergency blocking, which is particularly suitable for dealing with sudden changes in water flow.

[0063] Furthermore, the electric control valve 13 on the slurry bag is connected to the wireless receiving signal control unit 12 via the signal control line 11, and the central receiving and control unit 10 starts the blocking procedure according to the set maximum water flow threshold.

[0064] Specifically, the working principle of the blocking system is as follows:

[0065] The stress data acquired by the optical fiber sensor is transmitted to the central receiving and control unit through the signal transmission line. The central receiving and control unit can process the data in real time and calculate the dynamic changes of water flow through a preset algorithm. For sudden increases or decreases in water flow, the control unit can respond quickly and regulate the release rate and flow of the slurry at the rear end of the drill pipe.

[0066] An electrically controlled valve 13 is installed at the outlet of the slurry bag. According to the real-time feedback data from the optical fiber sensor, the system can accurately adjust the release amount of each slurry. This function ensures that the slurry release matches the water flow, optimizes the plugging effect, and reduces material waste.

[0067] Each slurry bag of the present invention is equipped with an independent electronically controlled hydraulic system 14, which can adjust the pressure under the command of the central receiving and control unit, and squeeze the slurry bag through the annular pneumatic cylinder of the electronically controlled hydraulic system 14, so as to control the flow rate and release rate of the slurry. The device ensures that different slurries can be released at an appropriate flow rate to meet the real-time plugging requirements. The electronically controlled hydraulic system 14 adopts the existing structure.

[0068] The release process of the slurry bag is managed by the central receiving and control unit. The central receiving and control unit receives data from the optical fiber sensor, analyzes the real-time water flow changes, and sets the maximum water flow threshold. Once the water flow exceeds the threshold, the system starts the emergency plugging program and sends instructions to adjust the release order and proportion of the slurry. When the water flow is large or increases suddenly, the system will automatically release water glass first to achieve rapid plugging, and then switch to cement slurry for reinforcement after the water flow stabilizes.

[0069] The system can automatically switch between slurries with different ratios without manual intervention, ensuring high efficiency and safety during the plugging process. For example, in the early stage of plugging, cement slurry with good fluidity (water-cement ratio range of 1.0-1.3) is used preferentially to fill pores and larger fracture areas. The fluidity of the slurry at this stage helps to evenly cover the gap between the outer wall of the orifice pipe and the rock wall to form a preliminary plugging layer. As the cracks are gradually filled, the system can automatically switch to cement slurry with a water-cement ratio of 0.8-0.9. This type of slurry has a high viscosity, which can not only improve the compactness of the plugging layer, but also enhance the compressive resistance of the plugging structure, and is suitable for the reinforcement stage. In the mid-term, it can be switched to cement slurry with a water-cement ratio of 0.8-0.9 for reinforcement plugging. If it is detected that the orifice pipe plugging position is close to the slurry bag (such as a short conveying path and small pressure loss), the system will give priority to cement slurry with a water-cement ratio of 0.6-0.7. The high viscosity of this slurry can quickly solidify and form a high-strength sealing layer, thereby providing stronger support in a short period of time and avoiding secondary damage caused by water erosion; when the water flow suddenly increases, it switches to water glass for rapid sealing.

[0070] Example 2

[0071] In a typical embodiment of the present invention, a method for plugging an orifice pipe based on water flow sensing and slurry coordinated regulation is provided, such as Figure 3 As shown, including:

[0072] Use optical fiber sensor to detect water flow pressure around orifice pipe in real time;

[0073] The water flow rate around the orifice pipe is obtained according to the water flow pressure;

[0074] When the water flow exceeds the set maximum water flow threshold, the plugging program is started, and slurry bags with different ratios are opened for plugging according to different water flow rates.

[0075] Furthermore, the water flow around the orifice pipe is obtained according to the strain, which is specifically obtained by the following formula:

[0076]

[0077] Where: ε-strain measured by the optical fiber sensor; P-pressure of water flow on the inner wall of the orifice pipe; D-outer diameter of the orifice pipe; E-Young's modulus of the pipeline material; t-wall thickness of the orifice pipe; ρ-density of water; R is the diameter of the grouting hole.

[0078] Furthermore, the maximum water flow threshold value may be determined according to the on-site construction conditions. Generally, when grouting and sealing the orifice pipe, if water flows out of the grouting hole, the sealing procedure must be performed.

[0079] Furthermore, the blocking procedure includes the following steps:

[0080] When the plugging conditions are met, cement slurry with a water-cement ratio of 1-1.3 is injected first, and the water flow is monitored in real time. Cement slurry with a water-cement ratio of 1-1.3 has good fluidity and is suitable for situations where the water flow is small in the initial stage of plugging and there are large cracks between the orifice pipe and the rock wall.

[0081] When the water flow rate remains constant, injection with the current slurry is continued to fill the cracks and form a preliminary seal;

[0082] Water flow rate increase range is 1-5m 3 / h, switch to cement slurry with a water-cement ratio of 0.8-0.9 for plugging; the cement slurry with a water-cement ratio of 0.8-0.9 has a higher viscosity and can better seal the orifice pipe. It is suitable for use in the later stage of filling or when the water flow rate increases, and can increase the plugging effect.

[0083] If the water flow rate increases significantly or suddenly (i.e. the water flow rate increases by more than 5m 3 / h), then switch to water glass for plugging until the water flow stabilizes or decreases, switch to the cement slurry with the previous water-cement ratio, and gradually reduce the injection ratio of water glass until the plugging is completed. By releasing the water glass slurry bag to quickly solidify the plug, the water glass and cement slurry will quickly form a gel after combining, blocking the sudden water channel between the orifice pipe and the rock wall to achieve emergency plugging. After the water flow decreases or stabilizes, the system returns to the conventional plugging mode, gradually reducing the proportion of water glass used to avoid rapid coagulation, and releasing other slurries with a water-cement ratio of 0.8-0.9 to reinforce the plugging. The control system dynamically adjusts the proportion and flow of cement slurry according to the water flow feedback data to ensure the density and stability of the plugging.

[0084] When the orifice pipe plugging position is close to the slurry bag (such as the conveying path is short and the pressure loss is small), the system will give priority to cement slurry with a water-cement ratio of 0.6-0.7. The high viscosity of this slurry can quickly solidify and form a high-strength plugging layer, thereby providing stronger support in a short time and avoiding secondary damage caused by water scouring.

[0085] Furthermore, after the plugging is completed, continue to monitor the changes in water flow to confirm whether the water flow will still pass through the gap between the outer wall of the orifice pipe and the rock bed to determine the plugging effect. If the monitoring results show that there is no water flow, it means that the plugging effect has achieved the expected effect. Then stop the slurry injection, and the plugging system enters the end state. After the drilling rig completes the drilling task and retracts the rod, clean the drill rod slurry bag to facilitate the reuse and subsequent maintenance of the system.

[0086] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. An orifice pipe plugging system based on water flow sensing and slurry coordinated regulation, characterized in that: include: The optical fiber sensor is arranged on the outer wall of the orifice pipe and is used to detect the strain around the orifice pipe caused by the water flow pressure in real time; Slurry bags, including a plurality of slurry bags with different proportions, the slurry bags are wrapped and fixed on the outer wall surface of the drill pipe, and an electric control valve is arranged at the outlet of the slurry bag; The central receiving and control unit calculates the water flow rate based on the collected strain around the orifice pipe, releases the slurry in the corresponding proportion slurry bag according to different water flow rates, and blocks the orifice pipe.

2. The orifice pipe plugging system based on water flow sensing and slurry coordinated regulation according to claim 1 is characterized in that: A plurality of optical fiber sensors are provided, and the probes of the plurality of optical fiber sensors are distributed at intervals on the outer wall surface of the orifice tube and are fixed by epoxy resin or optical fiber glue.

3. The orifice pipe plugging system based on water flow sensing and slurry coordinated regulation according to claim 1 is characterized in that: The optical fiber signal transmission line of the optical fiber sensor is connected to a central receiving and control unit, and the central receiving and control unit receives and processes the optical fiber signal.

4. The orifice pipe plugging system based on water flow sensing and slurry coordinated regulation according to claim 1, characterized in that: The multiple slurry bags with different proportions are respectively filled with cement slurry with a water-cement ratio of 0.6-0.7, cement slurry with a water-cement ratio of 0.8-0.9, cement slurry with a water-cement ratio of 1-1.3 and water glass.

5. The orifice pipe plugging system based on water flow sensing and slurry coordinated regulation according to claim 4 is characterized in that: The electric control valve is connected to a wireless signal receiving control unit, and the wireless signal receiving control unit starts a blocking procedure according to a set maximum water flow threshold.

6. A method for plugging an orifice pipe based on water flow sensing and slurry coordinated regulation, which is implemented by using the plugging system according to any one of claims 1 to 5, characterized in that: include: An optical fiber sensor is used to detect the strain around the orifice pipe caused by water flow pressure in real time, and the water flow around the orifice pipe is obtained according to the strain. When the water flow exceeds the set maximum water flow threshold, the plugging program is started, and slurry bags with different ratios are opened for plugging according to different water flow rates.

7. The orifice pipe plugging method based on water flow sensing and slurry coordinated regulation according to claim 6, characterized in that: The water flow around the orifice pipe is obtained according to the strain, which is specifically obtained by the following formula: Where: ε-strain measured by the optical fiber sensor; P-pressure of water flow on the inner wall of the orifice pipe; D-outer diameter of the orifice pipe; E-Young's modulus of the pipeline material; t-wall thickness of the orifice pipe; ρ-density of water; R is the diameter of the grouting hole.

8. The orifice pipe plugging method based on water flow sensing and slurry coordinated regulation according to claim 6, characterized in that: The maximum water flow threshold is set according to the on-site construction conditions.

9. The orifice pipe plugging method based on water flow sensing and slurry coordinated regulation according to claim 6, characterized in that: The blocking procedure comprises the following steps: When the plugging conditions are met, cement slurry with a water-cement ratio of 1 is first injected, while the water flow rate is monitored in real time; When the water flow rate remains constant, injection with the current slurry is continued to fill the cracks and form a preliminary seal; When the water flow rate increases by 1-5m 3 / h range, switch to cement slurry with a water-cement ratio of 0.8 for plugging; When the increase in water flow is greater than 5m 3 / h, switch to water glass for plugging until the water flow stabilizes or decreases, switch to cement slurry with the previous water-cement ratio, and gradually reduce the injection ratio of water glass until the plugging is completed.

10. The orifice pipe plugging method based on water flow sensing and slurry coordinated regulation according to claim 9, characterized in that: After the plugging is completed, continue to monitor the changes in water flow to confirm whether the water flow will still pass through the gap between the outer wall of the orifice pipe and the rock bed to determine the plugging effect. If the monitoring results show that no water flows through, it means that the plugging effect has achieved the expected effect.

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