Dynamic hole sealing, continuous pressure maintaining and automatic slurry supplementing device for drill hole

Abstract

The utility model provides a drilling dynamic hole sealing continuous pressure maintaining and automatic grout supplementing device which comprises a grout supplementing section and a mucus hole sealing section, the grout supplementing section is communicated with the mucus hole sealing section through a grouting pump, and a quick connector is arranged at the tail end of the mucus hole sealing section and connected with a grouting pipe. The grout supplementing section comprises a mucilage liquid cabin, a balance water pressure cabin and a grouting liquid pressure cabin are sequentially arranged on one side of the grout liquid cabin, the balance water pressure cabin and the grouting liquid pressure cabin are separated through a balance baffle capable of horizontally moving, and a balance floating plate is arranged on the liquid level in the balance water pressure cabin; the balance floating plate is connected with the grouting pump through a lever, and the mucus hole sealing section is communicated with the grouting liquid pressure cabin through a connecting pipe. The continuous pressure maintaining and automatic slurry supplementing device for dynamic hole sealing of the drill hole can seal new cracks generated by mining in time, and it is guaranteed that the gas extraction concentration of the drill hole is continuously located at a high level.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of underground gas prevention and control device, concretely relates to drilling dynamic hole sealing sustained pressure maintaining and automatic supplementary grouting device. BACKGROUND

[0002] The key of the underground drilling pre-extraction gas as one of important technical means of gas disaster prevention lies in hole sealing technology, and the quality of hole sealing directly influences the coal seam gas control effect. More than half of the drilling gas concentration of the mining working face is high in the initial extraction stage, but the drilling hole stress is redistributed due to the mining influence, the coal body around the hole is fractured and the gas leakage passage is generated, the gas leakage of the hole sealing area is caused in different degrees, and the gas extraction concentration is significantly reduced. At present, the commonly used "two plugging and one injection" pressure sealing hole makes the hole sealing material enter the cracks around the drilling hole, and then effectively plugs the gas leakage passage and increases the sealing effect of the drilling hole, but with the lapse of time, the commonly used "two plugging and one injection" cannot realize secondary grouting and pressure maintaining, and the gas extraction effect cannot be continuously maintained, thereby affecting the coal mine safety production.

[0003] Therefore, in order to solve the above problems, the drilling hole sealing adopts the "three plugging and two injection" hole sealing process, one section of viscous liquid is injected and a certain pressure value is maintained, and since the viscous liquid belongs to liquid and is lost with the generation of cracks, therefore, a drilling dynamic hole sealing sustained pressure maintaining and automatic supplementary grouting device is needed, the new cracks generated due to the mining influence are timely plugged, the drilling gas extraction concentration is continuously maintained at a high level, the coal seam gas control effect is improved, the drilling life is prolonged, and the safe and efficient production of the mine is ensured. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing drilling dynamic hole sealing sustained pressure maintaining and automatic supplementary grouting device, which can timely plug the new cracks generated due to the mining influence and ensure that the drilling gas extraction concentration is continuously maintained at a high level.

[0005] The utility model adopts the technical scheme, drilling dynamic hole sealing sustained pressure maintaining and automatic supplementary grouting device, including supplementary grouting section and viscous liquid hole sealing section, supplementary grouting section and viscous liquid hole sealing section communicate through grouting pump, viscous liquid hole sealing section tail end is provided with quick connector, quick connector is connected with grouting pipe;

[0006] Supplementary grouting section includes viscous liquid cabin, grouting liquid cabin one side is provided with balance water pressure cabin and grouting liquid pressure cabin in proper order, balance water pressure cabin and grouting liquid pressure cabin are separated through balance baffle that can move horizontally, and balance water pressure cabin is provided with balance float plate on liquid surface inside;

[0007] Balance float plate and grouting pump are connected through lever, and viscous liquid hole sealing section communicates with grouting liquid pressure cabin through connecting pipe.

[0008] The utility model has the characteristics that:

[0009] Further, the lever comprises a lever fulcrum, a balance lever, a long lever and a short lever, the lever fulcrum is arranged at the top of the slurry cabin, the lever fulcrum is used for supporting the balance lever, the balance lever is connected with the long lever and the short lever at two ends respectively, the long lever is connected with the grouting pump, and the short lever is connected with the balance floating plate.

[0010] Further, the middle part of the short lever is provided with a length adjusting buckle I, and the middle part of the long lever is provided with a length adjusting buckle II.

[0011] Further, the bottom of the grouting hydraulic pressure cabin is provided with a grouting hydraulic pressure cabin emptying port.

[0012] Further, the top of the grouting pressure cabin shell is provided with a track, a damping adjuster is installed on the track, the damping adjuster is connected with the balance baffle, can move left and right on the track, monitors the change of the slurry pressure in the drilling hole, and controls whether the grouting pump is opened or not according to the moving position of the balance baffle.

[0013] Further, the balance floating plate is provided with a counterweight.

[0014] Further, the top end of the balance water pressure cabin is provided with a water inlet.

[0015] Further, the top of the slurry cabin is provided with a slurry supplementing port, and the inside of the slurry cabin is provided with a slurry stirrer.

[0016] Further, the viscous liquid hole sealing section is provided with a compressed air interface, the compressed air interface is connected with a compressed air pipe to provide power for the grouting pump.

[0017] Further, the viscous liquid hole sealing section is provided with a one-way pressure maintaining delivery valve and a pressure gauge between the grouting pump and the quick connector.

[0018] The device has the advantages that:

[0019] The device has the functions of monitoring the pressure of the viscous liquid hole sealing section in the drilling hole in real time and serving as a signal source for whether the viscous liquid hole sealing section in the drilling hole needs to be grouted.

[0020] The device is provided with a balance baffle, the viscous liquid in the grouting hydraulic pressure cabin and the water in the balance water pressure cabin are separated, and if the pressure of the viscous liquid in the drilling hole decreases, the viscous liquid can move to one side of the grouting hydraulic pressure cabin.

[0021] The device is provided with a damping adjuster, the size of the damping adjuster can be adjusted according to the need of grouting pressure, and when the viscous liquid hole sealing section in the drilling hole is balanced, the pressures on both sides of the balance baffle are equal, that is, F 浆液压力舱 +F 阻尼调节器 =F 平衡水压力舱, the balance float is close to the balance water pressure chamber water surface under the action of the counterweight, if the drilling viscous sealing section pressure reduces, the balance plate moves to the grouting viscous chamber end, the balance water chamber liquid level reduces, the balance float also follows the liquid level reduction, one end of the balance lever is connected with the balance float, and the other end is connected with the grouting pump, by means of the lever balance principle, drilling dynamic sealing continuous pressure maintaining and automatic grouting supplement are realized.

[0022] The device of the utility model does not need external control cabinet, only utilizes lever principle and communicating vessel principle, realizes that both can continuously maintain pressure of viscous sealing section liquid of gas extraction drilling fluid, also realizes that new crack is plugged in time, power source relies on downhole pressure driving, can adapt to various working environments of coal mine downhole, has the advantages of simple use method and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the structural schematic diagram of the drilling dynamic sealing continuous pressure maintaining and automatic grouting supplement device of the utility model;

[0024] Figure 2 It is the I area sealing effect comparison chart in the embodiment 5 of the utility model;

[0025] Figure 3 It is the II area sealing effect comparison chart in the embodiment 6 of the utility model.

[0026] In the drawing, 1, grouting liquid pressure chamber, 2, grouting liquid pressure chamber emptying port, 3, balance baffle, 4, damping adjuster, 5, balance water pressure chamber, 6, balance float, 7, water inlet, 8, length adjusting buckle I, 9, grout supplement port, 10, balance lever, 11, grout agitator, 12, length adjusting buckle II, 13, pressure wind interface, 14, one-way pressure maintaining delivery valve, 15, connecting pipe, 16, pressure gauge, 17, quick connector, 18, grouting pump, 19, counterweight, 20, grout chamber, 21, lever fulcrum, 22, long rod, 23, short rod. DETAILED DESCRIPTION

[0027] The utility model will be explained in detail in connection with the drawings and specific embodiment.

[0028] The utility model discloses drilling dynamic sealing continuous pressure maintaining and automatic grouting supplement device, as shown in Figure 1 The utility model discloses drilling dynamic sealing continuous pressure maintaining and automatic grouting supplement device, as shown in

[0029] The sealing section of the sealing device is directly connected with the grouting liquid pressure chamber 1 through the connecting pipe 15, and finally realizes the communication with the grouting liquid pressure chamber 1, which has the functions of monitoring the pressure of the sealing section of the grouting liquid in real time and providing the signal source for determining whether the grouting liquid needs to be injected into the sealing section of the grouting liquid;

[0030] The balance baffle 3 separates the grouting liquid of the grouting liquid pressure chamber 1 and the water of the balance water pressure chamber 5, and moves to the side of the grouting liquid pressure chamber 1 when the pressure of the grouting liquid in the borehole decreases;

[0031] The damping regulator 4 adjusts the size according to the need of the grouting pressure, and makes the pressures on both sides of the balance baffle 3 equal when the sealing section of the grouting liquid in the borehole is balanced, that is, 浆液压力舱 +F 阻尼调节器 =F 平衡水压力舱 ;

[0032] The balance float 6 is close to the water surface of the balance water pressure chamber under the action of the counterweight 19, and moves to the end of the grouting liquid pressure chamber 1 when the pressure of the sealing section of the grouting liquid in the borehole decreases, so that the liquid surface of the balance water pressure chamber 5 is lowered, and the balance float 6 also follows the lowering of the liquid surface;

[0033] One end of the balance lever 10 is connected with the balance float 6, and the other end is connected with the grouting pump 18, and according to the lever principle, when the sealing section of the grouting liquid in the borehole needs to be grouted, the lever balance float 6 side falls, and then the lever grouting pump 18 side rises and synchronously opens the grouting pump switch, so that the pre-configured grouting liquid is injected into the sealing section of the grouting liquid in the borehole, when the pressure of the sealing section of the grouting liquid in the borehole reaches the set value, the balance baffle 3 moves to the end of the balance water pressure chamber 5, the liquid surface of the balance water pressure chamber 5 rises, and the balance lever 10 is balanced again by means of the lever principle, and the grouting pump 18 is closed, so as to realize the dynamic sealing of the borehole, the continuous pressure maintaining and the automatic grouting.

[0034] The technical scheme of the utility model will be further described below by means of the drawings and specific embodiments.

[0035] Embodiment 1

[0036] The device for dynamically sealing the borehole, continuously maintaining the pressure and automatically grouting comprises a grouting section and a grouting liquid sealing section, the grouting section is communicated with the grouting liquid sealing section through a grouting pump 18, and the end of the grouting liquid sealing section is provided with a quick connector 17 connected with a grouting pipe;

[0037] The grouting section comprises a grouting liquid chamber 20, a balance water pressure chamber 5 and a grouting liquid pressure chamber 1 are sequentially arranged on one side of the grouting liquid chamber 20, the balance water pressure chamber 5 and the grouting liquid pressure chamber 1 are separated through a balance baffle 3 which can move horizontally, and a balance float 6 is arranged on the liquid surface in the balance water pressure chamber 5;

[0038] The balance float 6 is connected to the grouting pump 18 via a lever, and the viscous sealing section is connected to the grouting fluid pressure chamber 1 via a connecting pipe 15.

[0039] Example 2

[0040] This embodiment has the following additional features compared to Embodiment 1:

[0041] The lever includes a fulcrum 21, a balance lever 10, a long rod 22, and a short rod 23. The fulcrum 21 is located at the top of the slurry chamber 20 and is used to support the balance lever 10. The two ends of the balance lever 10 are connected to the long rod 22 and the short rod 23, respectively. The long rod 22 is connected to the grouting pump 18, and the short rod 23 is connected to the balance float 6.

[0042] The short rod 23 is equipped with a length adjustment buckle I8 in the middle, and the long rod 22 is equipped with a length adjustment buckle II12 in the middle.

[0043] Example 3

[0044] This embodiment has the following additional features compared to embodiment 2:

[0045] The bottom of the grouting fluid pressure chamber 1 is provided with a grouting fluid pressure chamber vent 2.

[0046] The top of the outer shell of the grouting fluid pressure chamber 1 is equipped with a track, on which a damping regulator 4 is installed. The damping regulator 4 is connected to the balance baffle 3 and can move left and right on the track to monitor the changes in grout pressure in the borehole. The grouting pump 18 is controlled to start or stop based on the position of the balance baffle 3.

[0047] Example 4

[0048] This embodiment, based on embodiment 3, also has the following features:

[0049] A counterweight 19 is installed on the balance float 6.

[0050] A water inlet 7 is provided at the top of the balance water pressure chamber 5.

[0051] The top of the slurry chamber 20 is provided with a slurry inlet 9, and the inside of the slurry chamber 20 is provided with a slurry agitator 11.

[0052] The slurry sealing section is equipped with a compressed air interface 13, which is connected to a compressed air pipe to provide power to the grouting pump 18. On the slurry sealing section, a one-way pressure-maintaining delivery valve 14 and a pressure gauge 16 are installed between the grouting pump 18 and the quick connector 17.

[0053] Example 5

[0054] The device used in Example 4 was used to conduct dynamic sealing, continuous pressure holding, and automatic grouting tests on Region I. The results are as follows:

[0055] As Figure 2 shown, the area I test borehole adopts the drilling dynamic sealing and continuous pressure maintaining and automatic grouting device to carry out industrial test, the average gas extraction concentration of the area I borehole decreases to 4% after 80 days of extraction, and then the extraction concentration decreases gradually, and after 120 days of extraction, the gas extraction concentration basically tends to be stable;While the contrast area borehole only carries out the common two-plugging and one-annulus borehole sealing, and it is found that the average gas extraction concentration decreases to 4% after 20 days of extraction, and decreases to 2% after 80 days of extraction, and the extraction concentration attenuation is obvious.

[0056] Example 6

[0057] The device according to example 4 is used to carry out dynamic sealing, continuous pressure maintaining and automatic grouting test on area II, and the results are as follows:

[0058] As Figure 3 shown, the area II test borehole adopts the drilling dynamic sealing and continuous pressure maintaining and automatic grouting device to carry out industrial test, the average gas extraction concentration of the area II borehole decreases to 4% after 75 days of extraction, and the extraction concentration is always maintained above 2%, while the contrast borehole decreases to 4% in less than 20 days. It can be seen that the drilling dynamic sealing and continuous pressure maintaining and automatic grouting device can effectively and uninterruptedly fill and block the newly developed fissures during the drilling extraction process, reduce the air leakage during drilling extraction, and improve the gas sealing effect of the borehole.

[0059] The gas extraction borehole suitable for the device adopts a sectional solid-liquid sealing device, that is, the sealing material of the sealing section close to the hole mouth adopts cement mortar, and the material of the other sealing section adopts fluid mucilage. After the drilling is completed, the cement mortar sealing section is first injected with sealing material, and after the cement mortar is solidified, the fluid mucilage section is injected with prepared mucilage, and the mucilage of the fluid mucilage section is kept under a certain pressure, so that the effect of solid sealing liquid and liquid sealing gas is realized.

[0060] According to the pressure size required to be kept by the mucilage of the fluid mucilage section, the size of the damping adjuster is adjusted, so that the pressures on both sides of the balance baffle are equal, that is, F 浆液压力舱 +F 阻尼调节器 =F 平衡水压力舱 According to the water surface height of the balance water pressure chamber, the length adjusting buckle I and the length adjusting buckle II are adjusted, and the balance lever is kept in a balanced state by using the lever principle, that is, the balance float plate closely adheres to the water surface of the balance water pressure chamber, and the grouting pump is in a closed state. According to the opening pressure size of the grouting pump and the balance state, a counterweight can be arranged on the balance float plate, so that the balance plate rises and falls with the rise and fall of the liquid surface, and the sealing and grouting of the mucilage sealing section is timely. After the drilling dynamic sealing and continuous pressure maintaining and automatic grouting device is adjusted, the fluid mucilage grouting pipe of the sectional solid-liquid sealing device is connected through quick connection, and the pressure pipe is connected with the pressure interface, which serves as the power source of the grouting device.

[0061] When the new fissure is generated due to the influence of mining and periodic weighting of mine, the fluid slurry pressure in the sealing section flows into the new fissure and drops. At this time, because the grouting pressure chamber is directly connected with the fluid slurry section of the borehole, the F 浆液压力舱 +F 阻尼调节器 <F 平衡水压力舱 , the balance baffle moves to the grouting slurry pressure chamber, the liquid level in the balance water pressure chamber drops, and the balance float also drops, breaking the original balance, turning on the grouting pump switch, and rotating the slurry mixer under the drive of compressed air. The slurry is continuously delivered to the sealing section of the sealing device through the one-way pressure maintaining delivery valve, filling the new fissure and reaching the set pressure value. The balance baffle moves to the end of the balance water pressure chamber, and finally reaches the balance again, i.e. F 浆液压力舱 +F 阻尼调节器 =F 平衡水压力舱 , the liquid level in the balance water pressure chamber rises, the balance float also rises, and the balance rod is in a balanced state again, and the grouting pump switch is automatically turned off, realizing the continuous pressure maintaining and automatic slurry supplementing of the borehole dynamic sealing. The new fissure in the borehole is filled with slurry at all times and maintains a certain pressure, preventing air from entering the borehole and improving the gas extraction efficiency.

[0062] The one-way pressure maintaining delivery valve can ensure that the slurry pressure in the grouting pressure chamber directly comes from the fluid slurry sealing section of the sealing device, ensuring the authenticity and effectiveness of the monitored slurry pressure. The slurry is supplemented in time through the slurry supplementing port, so that there is always slurry in the grouting chamber that can be injected into the borehole fissure. The pressure in the fluid slurry sealing section can be directly observed through the pressure gauge, which helps the staff to judge whether the device is running normally in time. The new device realizes the timely dynamic sealing of the new fissure generated under the influence of mining and periodic weighting of mine, and can also maintain the pressure of the slurry in the borehole fissure at all times. It not only improves the drilling gas extraction concentration and prolongs the service life of the borehole, but also reduces the labor input, which has a positive significance for improving the efficiency of gas disaster prevention and ensuring the safety of coal mine production.

Claims

1. A drilling dynamic sealing and continuous pressure maintenance and automatic grouting device, characterized in that, It includes a grouting section and a viscous sealing section. The grouting section and the viscous sealing section are connected by a grouting pump (18). The end of the viscous sealing section is provided with a quick connector (17), which is connected to the grouting pipe. The grouting section includes a grout chamber (20), and a balancing water pressure chamber (5) and a grouting fluid pressure chamber (1) are arranged sequentially on one side of the grout chamber (20). The balancing water pressure chamber (5) and the grouting fluid pressure chamber (1) are separated by a horizontally movable balancing baffle (3). A balancing float (6) is arranged on the liquid surface inside the balancing water pressure chamber (5). The balance float (6) is connected to the grouting pump (18) by a lever, and the viscous sealing section is connected to the grouting fluid pressure chamber (1) by a connecting pipe (15).

2. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The lever includes a lever fulcrum (21), a balance lever (10), a long rod (22), and a short rod (23). The lever fulcrum (21) is located at the top of the slurry chamber (20) and is used to support the balance lever (10). The two ends of the balance lever (10) are connected to the long rod (22) and the short rod (23) respectively. The long rod (22) is connected to the grouting pump (18), and the short rod (23) is connected to the balance float (6).

3. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 2, characterized in that, The short rod (23) is provided with a length adjustment buckle I (8) in the middle, and the long rod (22) is provided with a length adjustment buckle II (12) in the middle.

4. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The bottom of the grouting fluid pressure chamber (1) is provided with a grouting fluid pressure chamber vent (2).

5. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The top of the outer shell of the grouting fluid pressure chamber (1) is equipped with a track, and a damping regulator (4) is installed on the track. The damping regulator (4) is connected to the balance baffle (3) and can move left and right on the track to monitor the changes in grout pressure in the borehole. The grouting pump (18) is controlled to start or stop according to the position of the balance baffle (3).

6. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The balance float (6) is equipped with a counterweight (19).

7. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The top of the balance water pressure chamber (5) is provided with a water inlet (7).

8. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The top of the slurry chamber (20) is provided with a slurry inlet (9), and the inside of the slurry chamber (20) is provided with a slurry agitator (11).

9. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, The slurry sealing section is equipped with a compressed air interface (13), and the compressed air interface (13) is connected to a compressed air pipe to provide power to the grouting pump (18).

10. The drilling dynamic sealing and continuous pressure maintenance and automatic grouting device according to claim 1, characterized in that, On the viscous sealing section, a one-way pressure-holding delivery valve (14) and a pressure gauge (16) are provided between the grouting pump (18) and the quick connector (17).

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