A horizontal pressure measuring borehole intelligent multi-hole section pressurized hole sealing device and method

Abstract

The present application relates to a kind of horizontal pressure measuring borehole intelligent porous section with pressure hole sealing device, belong to gas pressure determination field, including with pressure hole sealing special bag, pressure grouting compensation device, cement slurry storage device, pressure pipe, intelligent control device, cable etc., the with pressure hole sealing special bag is equipped with bag bag burst valve, the pressure grouting compensation device is equipped with pressurizing motor, check valve, pressure sensor, the cement slurry storage device is equipped with liquid level sensor, stirring motor, the intelligent control device is equipped with slurry metering module, pressure compensation module, logic analysis module, intelligent storage module, to horizontal pressure measuring borehole intelligent porous section with pressure hole sealing dynamic evaluation.It also relates to a construction method.

Description

Technical Field

[0001] This invention belongs to the field of coal seam gas pressure measurement, and relates to an intelligent multi-segment pressurized sealing device and method for horizontal pressure measuring boreholes. Background Technology

[0002] Currently, large-area downhole gas control requires the measurement of gas pressure parameters. However, sealing horizontal pressure-measuring boreholes is extremely difficult, with a very low success rate. This is mainly because crescent-shaped gaps easily appear after sealing, causing gas leakage and making it impossible to measure gas pressure. Existing downhole gas pressure measurement systems lack an intelligent sealing system for horizontal pressure-measuring boreholes. Due to the cumbersome gas pressure measurement procedures, current technology cannot achieve fully automated sealing of large-area horizontal pressure-measuring boreholes, nor can it achieve intelligent dynamic assessment of the entire section of horizontal pressure-measuring boreholes in large areas. Furthermore, current technology does not enable intelligent multi-section pressurized sealing of large-area horizontal pressure-measuring boreholes in downholes. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an intelligent multi-segment pressurized sealing device and method for horizontal pressure testing drilling.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] On the one hand, an intelligent multi-segment pressurized sealing device for horizontal pressure testing boreholes is provided, including a cement slurry storage device, a variable pressure grouting compensation device, an intelligent control device, a special bag for pressurized sealing, and a pressure testing tube;

[0006] The cement slurry storage device is used for mixing, storing, and outputting cement slurry to the variable pressure grouting compensation device;

[0007] The variable pressure grouting compensation device is used to change the grouting pressure and output cement slurry through a grouting hose extending to the bottom of the borehole.

[0008] The intelligent control device is used to receive monitoring data and intelligently control the cement slurry storage device and the variable pressure grouting compensation device.

[0009] The pressurized sealing bag is placed at the bottom and opening of the borehole to seal both ends of the borehole. The pressurized sealing bag is wrapped around the grouting hose and fixed to the pressure measuring tube.

[0010] The grouting hose is equipped with a grout metering sensor, a solenoid valve, and three burst valves that are opened by the pressure of the cement grout. Two burst valves are installed on the grouting hose inside the pressurized sealing bag, and one burst valve is installed on the grouting hose between the two pressurized sealing bags.

[0011] The bottom of the borehole is sealed with cotton yarn to form a pressure measuring chamber. The pressure measuring tube extends from the borehole opening into the pressure measuring chamber. A pressure measuring screen tube is installed on the pressure measuring tube inside the pressure measuring chamber, and a pressure gauge is installed at the end of the pressure measuring tube near the borehole opening.

[0012] Furthermore, the cement slurry storage device includes a tank body, inside which is installed a stirring motor, stirring mud blades, and a liquid level sensor. The stirring motor is connected to an intelligent control device via a cable and a signal transmission line. The tank body is connected to a variable pressure grouting compensation device via a mud connection pipe, and the liquid level is monitored in real time by the liquid level sensor.

[0013] Furthermore, the variable pressure grouting compensation device includes a variable pressure grouting pump, a pressurizing motor, a one-way valve, and a pressure sensor;

[0014] The variable pressure grouting pump has an inlet for connecting to a cement slurry storage device and an outlet for connecting to a grouting hose and outputting cement slurry. One end of the mud connection pipe is connected to the cement slurry storage device, and the other end is connected to the inlet, extending into the bottom of the variable pressure grouting pump. A pressure motor and a one-way valve are installed on the mud connection pipe. The pressure motor is used to increase or decrease the pressure of the mud connection pipe, and the one-way valve is used to prevent backflow of cement slurry. A pressure sensor is installed at the bottom of the variable pressure grouting pump to detect the grouting pressure inside the pump.

[0015] Furthermore, the variable pressure grouting compensation device is configured to perform grouting in three stages:

[0016] First stage: Grouting begins. The variable pressure grouting pump increases the grouting pressure to 1.5MPa≤P<2MPa. The burst valve inside the pressurized sealing bag bursts to start grouting until the grout completely fills the two pressurized sealing bags.

[0017] Second stage: After the pressure sealing bag is completely filled, continue to increase the grouting pressure to 2MPa≤P<3.5Pa, the burst valve of the middle sealing section bursts, and the grout begins to fill the sealing section between the two pressure sealing bags.

[0018] Third stage: Keep the entire borehole section under pressurized grouting, and maintain the grouting pressure between 2MPa≤P≤3Pa.

[0019] Furthermore, the intelligent control device includes a slurry metering module, a voltage compensation module, a logic analysis module, and an intelligent storage module;

[0020] Grout metering module: used for real-time feedback of the grouting status in the three stages of the variable pressure grouting compensation device;

[0021] The variable pressure compensation module is used to adjust the grouting pressure based on the real-time feedback of the grouting pressure data and status from the pressure sensor inside the variable pressure grouting pump. In the third stage, the grout metering module provides real-time feedback to adjust the grouting pressure.

[0022] Intelligent storage module: records the pressure and grouting volume throughout the grouting process and can transmit the data to the surface via the downhole ring network for judging the quality of local sealing.

[0023] The logic analysis module monitors the three stages of grouting in real time using level sensors, pressure sensors, and grout metering sensors. When the data monitored by the level sensor reaches a preset critical value, an alarm is triggered and grout is added. Data from the pressure sensor and grout metering sensor monitors the sealing stage and quality in real time, thus inferring the reliability of the current sealing quality. The module uses a built-in pressure model data unit to monitor the following stages: Stage 1: Pressure rises slowly then stabilizes; Stage 2: Pressure rises rapidly then stabilizes; Stage 3: Pressure rises first then falls with a wave-like or wave-like pattern. If the pressure model shows a significant drop in grouting pressure at a certain stage while the grout metering data spikes, it is determined to be a leak, and the solenoid valve is controlled to close the grouting channel and an alarm is triggered.

[0024] The grouting status, progress, and dynamic evaluation of each borehole will be displayed on the monitor in real time. The dynamic evaluation includes:

[0025] High-quality grouting – 100% success rate in sealing the borehole;

[0026] High-quality grouting – 80% success rate in sealing the borehole;

[0027] Grouting quality was average – sealing success rate was 60%.

[0028] Poor grouting quality results in a 0-60% success rate for hole sealing.

[0029] Drilling leakage – 0% success rate in sealing the borehole.

[0030] Furthermore, the grouting volume required for the first stage is calculated using the length of the pressure sealing bag and the borehole diameter.

[0031] The grouting volume in the second stage is calculated by the remaining volume after the two pressurized sealing bags are expanded, with the intermediate pressurized grouting section being no less than 50m.

[0032] The third stage involves maintaining pressurized grouting throughout the entire borehole section, with the grouting pressure kept between 2MPa ≤ P ≤ 3Pa, to fill the cracks until the cement grout solidifies, at which point the grout metering stops displaying grouting or the grouting volume is less than 0.005m. 3 If the pressure grouting time is not less than 3 hours in the third stage, then the grouting is complete.

[0033] On the other hand, the present invention provides an intelligent multi-segment pressurized sealing method for horizontal pressure-measuring drilling, comprising the following steps:

[0034] S1: Insert the pressure testing tube and grouting hose into the borehole, fix the pressure sealing bag to both ends of the pressure testing tube, and cover the grouting hose; fix cotton yarn at one end of the borehole near the bottom to seal the bottom of the borehole and form a pressure testing chamber.

[0035] S2: Start grouting. The grouting pressure is increased to 1.5MPa≤P<2MPa through the variable pressure grouting compensation device, so that the burst valve in the pressurized sealing bag bursts and the cement grout completely fills the two pressurized sealing bags.

[0036] S3: After the pressure sealing bag is filled, continue to increase the grouting pressure to 2MPa≤P<3.5Pa, so that the burst valve of the middle sealing section bursts and the cement grout fills the sealing section between the two pressure sealing bags.

[0037] S4: Maintain the grouting pressure between 2MPa≤P≤3Pa, keep the entire borehole section under pressurized grouting, and fill the borehole fissures until the cement grout solidifies.

[0038] Furthermore, the grouting volume in steps S2 and S3 is calculated by the intelligent control device, and the current grouting status is determined based on the real-time feedback from the grout metering module.

[0039] The pressure is adjusted by the pressure compensation module based on the grouting pressure data and status fed back from the pressure sensor and grout metering module inside the grouting pump.

[0040] Steps S2-S4 are monitored in real time by liquid level sensor, pressure sensor, and grout metering sensor. When the liquid level sensor reaches the preset critical value, an alarm is triggered and grout is added in time. The sealing stage and quality are monitored in real time by pressure sensor and grout metering data, thereby inferring the reliability of the current sealing quality.

[0041] Monitoring via the built-in pressure model data unit shows that in step S2, the pressure rises slowly and then stabilizes; in step S3, the pressure rises rapidly and then stabilizes; and in step S4, the pressure rises and then falls with a steady or stable wave. When a significant drop in grouting pressure occurs while the grout metering data increases sharply, it is determined to be a leak. The solenoid valve is then controlled to close the grouting channel and an alarm is triggered.

[0042] The beneficial effects of this invention are as follows:

[0043] (1) Due to the difficulty of sealing horizontal pressure test boreholes, the success rate is extremely low. This invention can achieve pressure sealing of horizontal boreholes, ensuring that the cracks around the borehole are fully filled, ensuring the reliability of gas pressure measurement data, reducing labor intensity, and greatly improving the success rate of horizontal pressure test boreholes.

[0044] (2) It can be connected to the downhole ring network, and the sealing data is automatically uploaded to the well dispatch center for comprehensive evaluation and judgment of the sealing status of local measuring points.

[0045] (3) The horizontal pressure measuring device can be matched with drill rods of different diameters, with a high degree of matching freedom and the measurement results are not affected.

[0046] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0048] Figure 1 Schematic diagram of an intelligent multi-segment pressurized sealing device for horizontal pressure testing drilling;

[0049] Figure 2 The time-stress curves are divided into three stages;

[0050] Figure 3 The execution logic diagram for an intelligent multi-segment pressurized sealing device for horizontal pressure testing drilling.

[0051] Figure reference numerals: 1. Cement slurry storage device; 2. Agitator motor; 3. Agitator blades; 4. Cable and signal transmission line; 5. Liquid level sensor; 6. Intelligent control device; 7. Variable pressure grouting compensation device; 8. Pressurized motor; 9. One-way valve; 10. Pressure sensor; 11. Grouting hose; 12. Pressure gauge; 13. Pressure sealing bag; 14. Pressure measuring tube; 15. Cotton yarn; 16. Pressure measuring screen tube; 17. Bursting valve; 18. Bursting valve inside the bag; 19. Slurry connecting pipe; 20. Slurry metering sensor and solenoid valve. Detailed Implementation

[0052] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0053] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0054] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0055] Please see Figure 1-3 A horizontal pressure-measuring drilling intelligent multi-hole section pressurized sealing device includes a cement slurry storage device 1, a variable pressure grouting compensation device 7, an intelligent control device 6, a special pressurized sealing bag 13, and a pressure measuring tube 14.

[0056] The cement slurry storage device 1 includes a tank body, inside which is installed a stirring motor 2, stirring blades 3, and a liquid level sensor 5. The stirring motor 2 is connected to an intelligent control device 6 via a cable and signal transmission line 4. The tank body is connected to a variable pressure grouting compensation device 7 via a slurry connection pipe 19, and the liquid level is monitored in real time by the liquid level sensor 5. After the cement and water are mixed in the appropriate ratio, the motor starts, and the stirring device stirs at a constant speed of 0.5 to 1 revolution / s. The liquid level sensor 5 monitors the liquid level in real time and reports the liquid level status to the intelligent control device 6.

[0057] A pressure-sealing bladder 13 is installed at the bottom and opening of the borehole to seal both ends of the borehole. The pressure-sealing bladder 13 covers the grouting hose 11 and is fixed to the pressure measuring tube 14. During variable pressure grouting, the burst valve 17 inside the bladder opens first, and the cement grout fills the front and rear bladders first. The bladder can withstand a maximum pressure of 4MPa, and the burst valve 17 inside the bladder has a minimum burst pressure of 1.5MPa. The burst valve 17 in the middle has a minimum burst pressure of 2MPa.

[0058] The grouting hose 11 is equipped with a grout metering sensor, a solenoid valve 20, and three burst valves 17 that are opened by the pressure of the cement grout. Two burst valves 17 are installed on the grouting hose 11 inside the pressurized sealing bag 13, and one burst valve 17 is installed on the grouting hose 11 between the two pressurized sealing bags 13. The bottom of the borehole is sealed with cotton yarn 15 to form a pressure measuring chamber. The pressure measuring tube 14 extends from the borehole opening into the pressure measuring chamber. The pressure measuring tube 14 in the pressure measuring chamber is equipped with a pressure measuring screen tube 16. A pressure measuring pressure gauge 12 is installed at the end of the pressure measuring tube 14 near the borehole opening.

[0059] The variable pressure grouting compensation device 7 includes a variable pressure grouting pump, a pressurizing motor 8, a one-way valve 9, and a pressure sensor 10. The variable pressure grouting pump has an inlet for connecting to the cement slurry storage device 1 and an outlet for connecting to the grouting hose 11 and outputting cement slurry. One end of the mud connecting pipe 19 is connected to the cement slurry storage device 1, and the other end is connected to the inlet, extending into the bottom of the variable pressure grouting pump. The pressurizing motor 8 and the one-way valve 9 are installed on the mud connecting pipe 19. The pressurizing motor 8 is used to increase or decrease the pressure of the mud connecting pipe 19, and the one-way valve 9 is used to prevent backflow of cement slurry. The pressure sensor 10 is installed at the bottom of the variable pressure grouting pump and is used to detect the grouting pressure inside the variable pressure grouting pump.

[0060] The variable pressure grouting compensation device is set up with grouting in three stages. The first stage is the start of grouting: the grouting pump increases the grouting pressure (P) to 1.5MPa≤P<2MPa, and the burst valve 18 in the bladder bag bursts to start grouting; until the grout completely fills the two bladder bags. The second stage is after the bladder bags are completely filled, the grouting pressure is increased to 2MPa≤P<3.5Pa, the burst valve 17 in the intermediate sealing section bursts, and the grout begins to fill the sealing section between the two bladder bags. The third stage of grouting is the most important. Because the first two stages of sealing the ordinary parallel section have been completed, the third stage is mainly to keep the entire borehole section in a pressurized grouting state, and the grouting pressure is maintained between 2MPa≤P≤3Pa. This is because numerous cracks will be generated around the borehole due to the interaction of drilling disturbance and ground stress. Pressurized grouting can ensure that the cracks are filled with grout, ensuring the reliability of the sealing. The intelligent grouting process involves several stages. The first stage grouting volume is calculated using the bag length and borehole diameter: V1 = πr²h1. The second stage grouting volume is the remaining volume after the two bags expand: V2 = πr²h2, with the intermediate pressurized grouting section being no less than 50m. The third stage primarily involves maintaining the entire borehole section under pressurized grouting, with the grouting pressure maintained between 2MPa ≤ P ≤ 3Pa, to fill the cracks until the cement grout solidifies. At this point, the grout meter stops displaying grouting or the grouting volume is less than 0.005m³ / min. Simultaneously, the third stage pressurized grouting must last at least 3 hours to complete the grouting process.

[0061] The intelligent control device 6 is used to receive monitoring data and intelligently control the cement slurry storage device 1 and the variable pressure grouting compensation device 7. The intelligent control device 6 includes a grouting progress display, a slurry metering module, a variable pressure compensation module, a logic analysis module, and an intelligent storage module.

[0062] Grout metering module: Based on pre-set data, the intelligent control device 6 automatically injects grout in three stages. Feedback from each grouting stage is provided in real time by the grout metering module to determine the current grouting status. (Since the grouting volume in the first two stages is relatively fixed, the allowable error is within 15%. If the error exceeds this range, a possible leakage condition will be indicated, and an alarm will be triggered promptly.)

[0063] The pressure compensation module: Based on the pressure sensor 10 inside the grouting pump, it provides feedback on grouting pressure data and status. In the third stage, it adjusts the grouting pressure based on real-time feedback from the grout metering module. (Within the range of 2MPa≤P≤3Pa, pressure is directly proportional to flow rate. As the grout metering data increases, the pressure also increases. If, during the grout compensation process, the grout metering exceeds the volume required for the sealing section, a potential leakage condition is indicated, and an alarm is triggered promptly.)

[0064] The intelligent control device 6 is used to receive monitoring data and intelligently control the cement slurry storage device 1 and the variable pressure grouting compensation device 7. The intelligent control device 6 includes a grouting progress display, a slurry metering module, a variable pressure compensation module, a logic analysis module, and an intelligent storage module.

[0065] Grout metering module: Based on pre-set data, the intelligent control device 6 automatically injects grout in three stages. Feedback from each grouting stage is provided in real time by the grout metering module to determine the current grouting status. (Since the grouting volume in the first two stages is relatively fixed, the allowable error is within 15%. If the error exceeds this range, a possible leakage condition will be indicated, and an alarm will be triggered promptly.)

[0066] The pressure compensation module: Based on the pressure sensor 10 inside the grouting pump, it provides feedback on grouting pressure data and status. In the third stage, it adjusts the grouting pressure based on real-time feedback from the grout metering module. (Within the range of 2MPa≤P≤3Pa, pressure is directly proportional to flow rate. As the grout metering data increases, the pressure also increases. If, during the grout compensation process, the grout metering exceeds the volume required for the sealing section, a potential leakage condition is indicated, and an alarm is triggered promptly.)

[0067] The grouting status, progress, and dynamic evaluation of each borehole will be displayed on the monitor in real time. The dynamic evaluation includes:

[0068] High-quality grouting – 100% success rate in sealing the borehole;

[0069] High-quality grouting – 80% success rate in sealing the borehole;

[0070] Grouting quality was average – sealing success rate was 60%.

[0071] Poor grouting quality results in a 0-60% success rate for hole sealing.

[0072] Drilling leakage – 0% success rate in sealing the borehole.

[0073] Based on the above device, an intelligent multi-segment pressurized sealing method for horizontal pressure-measuring boreholes is provided, which can use the above-mentioned variable pressure grouting compensation device 7 to measure the pressure of multiple boreholes through multiple grouting hoses 11, including the following steps:

[0074] S1: Insert the pressure measuring tube 14 and the grouting hose 11 into the borehole, fix the pressure sealing bag to both ends of the pressure measuring tube 14 and cover the grouting hose 11; fix cotton yarn 15 at one end of the borehole near the bottom of the hole to seal the bottom of the hole and form a pressure measuring chamber.

[0075] S2: Start grouting. The grouting pressure is increased to 1.5MPa≤P<2MPa by the variable pressure grouting compensation device 7, so that the burst valve 17 in the pressurized sealing bag bursts, and the cement grout completely fills the two pressurized sealing bags.

[0076] S3: After the pressure sealing bag is filled, continue to increase the grouting pressure to 2MPa≤P<3.5Pa, so that the burst valve 17 of the middle sealing section bursts and the cement grout fills the sealing section between the two pressure sealing bags.

[0077] S4: Maintain the grouting pressure between 2MPa≤P≤3Pa, keep the entire borehole section under pressurized grouting, and fill the borehole fissures until the cement grout solidifies.

[0078] The entire device is gradually inserted into the pressure testing borehole. Once completed, automatic grouting is activated. After grouting is finished, wait another 24 hours for the cement to fully harden before installing pressure gauge 12. The pressure testing foundation work is now complete.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A multi-segment pressurized sealing device for horizontal pressure testing drilling, characterized in that: Includes cement slurry storage device, variable pressure grouting compensation device, intelligent control device, special bag for pressurized sealing, and pressure measuring tube; The cement slurry storage device is used for mixing, storing, and outputting cement slurry to the variable pressure grouting compensation device; The variable pressure grouting compensation device is used to change the grouting pressure and output cement slurry through a grouting hose extending to the bottom of the borehole. The intelligent control device is used to receive monitoring data and intelligently control the cement slurry storage device and the variable pressure grouting compensation device. The pressurized sealing bag is placed at the bottom and opening of the borehole to seal both ends of the borehole. The pressurized sealing bag is wrapped around the grouting hose and fixed to the pressure measuring tube. The grouting hose is equipped with a grout metering sensor, a solenoid valve, and three burst valves that are opened by the pressure of the cement grout. Two burst valves are installed on the grouting hose inside the pressurized sealing bag, and one burst valve is installed on the grouting hose between the two pressurized sealing bags. The bottom of the borehole is sealed with cotton yarn to form a pressure measuring chamber. The pressure measuring tube extends from the borehole opening into the pressure measuring chamber. A pressure measuring screen tube is installed on the pressure measuring tube inside the pressure measuring chamber. A pressure measuring pressure gauge is installed at the end of the pressure measuring tube near the borehole opening. The cement slurry storage device includes a tank body, inside which are installed a stirring motor, stirring mud blades, and a liquid level sensor. The stirring motor is connected to an intelligent control device via a cable and a signal transmission line. The tank body is connected to a variable pressure grouting compensation device via a mud connection pipe, and the liquid level is monitored in real time by the liquid level sensor. The variable pressure grouting compensation device includes a variable pressure grouting pump, a pressurizing motor, a one-way valve, and a pressure sensor; The variable pressure grouting pump has an inlet for connecting to a cement slurry storage device and an outlet for connecting to a grouting hose and outputting cement slurry. One end of the mud connection pipe is connected to the cement slurry storage device, and the other end is connected to the inlet, extending into the bottom of the variable pressure grouting pump. The pressure motor and the one-way valve are installed on the mud connection pipe. The pressure motor is used to increase or decrease the pressure of the mud connection pipe, and the one-way valve is used to prevent backflow of cement slurry. The pressure sensor is installed at the bottom of the variable pressure grouting pump to detect the grouting pressure inside the pump. The variable pressure grouting compensation device is configured to perform grouting in three stages: First stage: Grouting begins. The variable pressure grouting pump increases the grouting pressure to 1.5MPa≤P<2MPa. The burst valve inside the pressurized sealing bag bursts to start grouting until the grout completely fills the two pressurized sealing bags. Second stage: After the pressure sealing bag is completely filled, continue to increase the grouting pressure to 2MPa≤P<3.5MPa, the burst valve of the middle sealing section bursts, and the grout begins to fill the sealing section between the two pressure sealing bags. Third stage: Keep the entire borehole section under pressurized grouting, and maintain the grouting pressure between 2MPa≤P≤3MPa; The intelligent control device includes a slurry metering module, a voltage compensation module, a logic analysis module, and an intelligent storage module. Grout metering module: used for real-time feedback of the grouting status in the three stages of the variable pressure grouting compensation device; The variable pressure compensation module is used to adjust the grouting pressure based on the real-time feedback of the grouting pressure data and status from the pressure sensor inside the variable pressure grouting pump, and the real-time feedback from the grout metering module in the three stages. Intelligent storage module: records the pressure and grouting volume throughout the grouting process and can transmit the data to the surface via the downhole ring network for judging the quality of local sealing. The logic analysis module monitors the three stages of grouting in real time using level sensors, pressure sensors, and grout metering sensors. When the data monitored by the level sensor reaches a preset critical value, an alarm is triggered and cement grout is added. Data from the pressure sensor and grout metering sensor monitors the sealing stage and quality in real time, thereby deducing the reliability of the current sealing quality. The built-in pressure model data unit of the logic analysis module monitors the pressure in three stages: Stage 1: Pressure rises slowly and then stabilizes; Stage 2: Pressure rises rapidly and then stabilizes; Stage 3: Pressure wave stabilizes. If the built-in pressure model data unit detects a significant drop in grouting pressure and a sharp increase in grout metering data at a certain stage, it is determined to be a leak, and the solenoid valve is controlled to close the grouting hose and an alarm is triggered. The grouting status, progress, and dynamic evaluation of each borehole will be displayed on the monitor in real time.

2. The intelligent multi-segment pressurized sealing device for horizontal pressure testing drilling according to claim 1, characterized in that: The required grouting volume for the first stage is calculated based on the length of the pressure sealing bag and the borehole diameter. The grouting volume in the second stage is calculated by the remaining volume after the two pressurized sealing bags are expanded, with the intermediate pressurized grouting section being no less than 50m. In the third stage, the entire borehole section is kept under pressurized grouting, with the grouting pressure maintained between 2MPa≤P≤3MPa, so that the cracks are filled until the cement grout solidifies. The grout metering module no longer displays grouting or the grouting volume is less than 0.005m³ / min. At the same time, the pressurized grouting in the third stage is ensured to be no less than 3 hours, then the grouting is completed.

3. A method for intelligent multi-segment pressurized sealing of horizontal pressure-measuring boreholes, characterized in that: The intelligent multi-segment pressurized sealing device for horizontal pressure testing drilling according to claim 1 includes the following steps: S1: Insert the pressure testing tube and grouting hose into the borehole, fix the pressure sealing bag to both ends of the pressure testing tube, and cover the grouting hose; fix cotton yarn at one end of the borehole near the bottom to seal the bottom of the borehole and form a pressure testing chamber. S2: Start grouting. The grouting pressure is increased to 1.5MPa≤P<2MPa through the variable pressure grouting compensation device, so that the burst valve in the pressurized sealing bag bursts and the cement grout completely fills the two pressurized sealing bags. S3: After the pressure sealing bag is filled, continue to increase the grouting pressure to 2MPa≤P<3.5MPa, so that the burst valve of the middle sealing section bursts and the cement grout fills the sealing section between the two pressure sealing bags. S4: Maintain the grouting pressure between 2MPa≤P≤3MPa, keep the entire borehole section under pressurized grouting, and fill the borehole fractures until the cement grout solidifies. The grouting volume in steps S2 and S3 is calculated by the intelligent control device, and the current grouting status is determined based on the real-time feedback from the grout metering module. The grouting pressure is adjusted by the variable pressure compensation module based on the real-time grouting pressure data and status fed back by the pressure sensor and grout metering module inside the variable pressure grouting pump. Steps S2-S4 are monitored in real time by liquid level sensor, pressure sensor, and slurry metering sensor. When the liquid level sensor reaches the preset critical value, an alarm is triggered in time and cement slurry is added. The sealing stage and quality are monitored in real time by pressure sensor and slurry metering data, thereby inferring the reliability of the current sealing quality. Monitoring via the built-in pressure model data unit shows that in step S2, the pressure rises slowly and then stabilizes; in step S3, the pressure rises rapidly and then stabilizes; and in step S4, the pressure wave stabilizes. When a significant drop in grouting pressure occurs while the grout metering data increases sharply, it is determined to be a leak. The solenoid valve is then controlled to close the grouting hose, and an alarm is triggered.

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