Double plug type water pressure device for coal mine floor water-resisting layer

Abstract

A double-plug water-pressurizing device for the waterproof layer of a coal mine floor includes a water pump, a pumping pump, a pressure stabilizing tank, a pressurizing water pipe, a manual pressurizing pump, and a drilling rig. The outlet of the water pump is connected to the pumping end of the pumping pump via a first flexible hose, and the outlet of the pumping pump is connected to one end of the pressure stabilizing tank via the first flexible hose. The other end of the pressure stabilizing tank is connected to the waterproof layer of the floor via a second flexible hose. The drilling rig is positioned above the waterproof layer of the floor. The pressure end of the manual pressurizing pump is connected to the waterproof layer of the floor via a pressurizing water pipe. This invention has strong adaptability to underground working conditions and high operating efficiency.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety testing technology, specifically to a double-plug water pressure device for the water-proof layer of a coal mine floor. Background Technology

[0002] In the field of safe coal mining, the confined water in the coal seam floor (especially the water in the Ordovician limestone aquifer) is the core risk source for causing floor water inrush accidents. The water-blocking capacity of the floor aquitard (such as permeability coefficient and water-blocking coefficient) is the key basis for judging the safety of pressurized mining. In the existing technology, hydrogeological parameters of the aquitard are mainly obtained through water pressure tests. However, traditional water pressure devices and testing methods have many technical shortcomings and cannot meet the needs of accurate testing under complex underground working conditions.

[0003] Chinese patent application CN201210463857.8, filed on November 18, 2012, discloses a high-pressure water device, comprising: an inlet hose connected to an inlet pipe; an operating panel at the inlet of the inlet pipe; the inlet pipe connected to an extension pipe section; and the extension pipe section connected to a sleeve of the outlet pipe. A telescopic support is welded to the middle of the inlet pipe, and a base is welded to the bottom of the telescopic support. Double-brake casters are welded to the bottom of the base. A sealing ring is installed at the outlet of the outlet pipe, which is connected to a conical nozzle via a fastening nut. The invention has a scientifically sound structure, capable of creating deep grooves to effectively release gas and prevent outbursts. However, the invention does not solve the problems of poor adaptability to underground working conditions and low operating efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a double-plug water-pressurizing device for the water-proof layer of the coal mine floor that has strong adaptability to underground working conditions and high operating efficiency, so as to solve the problems of poor adaptability to underground working conditions and low operating efficiency in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is: a double-plug water-pressing device for the waterproof layer of a coal mine floor, the double-plug water-pressing device for the waterproof layer of a coal mine floor includes a water pump, a pumping pump, a pressure stabilizing tank, a pressure-pressing water pipe, a manual pressure-pressing pump and a drilling rig; The outlet of the water pump is connected to the pumping end of the water pump through a first hose, and the outlet of the water pump is connected to one end of the pressure stabilizing tank through the first hose. The other end of the pressure stabilizing tank is connected to the bottom plate waterproof layer through a second hose. The drilling rig is set above the bottom plate waterproof layer. The pressure end of the manual pressure pump is connected to the waterproof layer of the base plate via a pressure water pipe.

[0006] The other end of the pressure stabilizing tank is connected to the drill rod via a second hose, and the top of the drill rod is connected to the output end of the drilling rig.

[0007] A flow meter and a pressure gauge are sequentially installed between the pressure stabilizing tank and the second hose.

[0008] The bottom plate waterproof layer is divided into bottom plate water-conducting and breaking bag, effective waterproof layer and pressurized water-conducting belt arranged from top to bottom; An upper sealing mechanism and a lower sealing mechanism are respectively installed in the effective waterproof layer. The upper sealing mechanism is connected to the second hose, and the lower sealing mechanism is also connected to the second hose.

[0009] The upper sealing mechanism is an upper packer or an upper water stop valve, and the lower sealing mechanism is a lower packer or a lower water stop valve.

[0010] A water level gauge is also installed inside the waterproof layer of the base plate.

[0011] Both the first and second hoses are provided with hose threads at the connection points to secure the connection.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. In this utility model, a double-plug type water-pressurizing device for a coal mine floor waterproofing layer, the outlet end of a water pump is connected to the pumping end of a water pump via a first flexible hose. The outlet end of the pumping end is connected to one end of a pressure-stabilizing tank via the first flexible hose, and the other end of the pressure-stabilizing tank is connected to the floor waterproofing layer via a second flexible hose. The drilling rig is positioned above the floor waterproofing layer. The pressure end of a manual pressure pump is connected to the floor waterproofing layer via a pressure-pressurizing water pipe. In application, the water pump provides the basic water source, and the water pump pressurizes and delivers the water source through the first flexible hose, ensuring that the water supply flow meets the requirements for hole washing and water pressurization. The pressure tank acts as a pressure buffer core, balancing fluctuations in water supply pressure. Through internal air bladders or pressure-bearing chambers, it stabilizes the pressure within a preset range. The pressure-stabilizing tank controls test pressure fluctuations within a suitable range, maintaining pressure through real-time pressure replenishment. This ensures the comparability of seepage flow data at different pressure stages, avoiding errors in permeability coefficient calculations due to pressure deviations. The coordinated water supply from the pumps increases the wellbore flushing flow rate. For conditions without return water at the wellhead, the flushing time is shortened, while ensuring thorough removal of rock cuttings from the well, preventing blockage of the aquitard fractures and ensuring test accuracy. Therefore, this invention offers strong adaptability to downhole conditions and high operational efficiency.

[0013] 2. In this utility model, a double-plug type water-pressurizing device for the waterproof layer of a coal mine floor, the other end of the pressure stabilizing tank is connected to the drill rod via a second flexible hose. The top of the drill rod is connected to the output end of the drilling rig. During application, when significant resistance is encountered during the lowering and raising of the packer, the drill rod of the drilling rig is used to lower the packer, inject water, and raise the packer. If successful, the packer can be lowered manually using the second flexible hose, and the drilling rig can drive the drill rod to complete vertical drilling. This device also assists in the lowering and retrieval of the packer mechanism. Therefore, this utility model has good synergistic effects and is easy to operate. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the drill rod structure in this utility model; In the diagram: 1. Water pump; 2. First hose; 3. Water pump; 4. Pressure tank; 5. Flow meter; 6. Pressure gauge; 7. Pressurizing water pipe; 8. Manual pressurizing pump; 9. Second hose; 10. Waterproof layer of bottom plate; 11. Drill rod; 12. Drilling rig; 13. Upper sealing mechanism; 14. Lower sealing mechanism; 15. Water level gauge. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] See Figures 1 to 2 A double-plug water-pressing device for the waterproof layer of a coal mine floor, comprising a water pump 1, a water pump 3, a pressure stabilizing tank 4, a pressure-pressing water pipe 7, a manual pressure-pressing pump 8, and a drilling rig 12. The outlet of the water pump 1 is connected to the pumping end of the water pump 3 through the first hose 2. The outlet of the water pump 3 is connected to one end of the pressure stabilizing tank 4 through the first hose 2. The other end of the pressure stabilizing tank 4 is connected to the bottom plate waterproof layer 10 through the second hose 9. The drilling rig 12 is set above the bottom plate waterproof layer 10. The pressure end of the manual pressure pump 8 is connected to the bottom plate waterproof layer 10 through the pressure water pipe 7.

[0017] The other end of the pressure stabilizing tank 4 is connected to the drill rod 11 via the second hose 9, and the top of the drill rod 11 is connected to the output end of the drilling machine 12.

[0018] A flow meter 5 and a pressure gauge 6 are sequentially installed between the pressure stabilizing tank 4 and the second hose 9.

[0019] The bottom plate waterproof layer 10 is composed of bottom plate water-conducting and breaking bag, effective waterproof layer and pressurized water-conducting belt arranged from top to bottom; An upper sealing mechanism 13 and a lower sealing mechanism 14 are respectively provided in the effective waterproof layer. The upper sealing mechanism 13 is connected to the second hose 9, and the lower sealing mechanism 14 is connected to the second hose 9.

[0020] The upper sealing mechanism 13 is an upper packer or an upper water stop, and the lower sealing mechanism 14 is a lower packer or a lower water stop.

[0021] A water level gauge 15 is also installed inside the waterproof layer 10 of the base plate.

[0022] Both the first hose 2 and the second hose 9 are provided with hose threads at the connection points to secure the connection.

[0023] The instructions for using this utility model are as follows: Vertical drilling was carried out using drilling rig 12, drilling to the effective water-resistant test section below the water-conducting failure zone of the bottom plate, with the length of the test section controlled at 3-5m; After drilling is completed, start water pump 1 to clean the borehole. The cleaning drill bit must be lowered to the bottom of the hole, and the cleaning flow rate should be greater than the water supply during drilling. Borehole cleaning should continue until the return water at the borehole opening is clear. If there is no return water at the borehole opening, the cleaning time should not be less than 15 minutes. After cleaning, the upper sealing mechanism 13 and the lower sealing mechanism 14 are lowered. The sealing mechanisms need to be accurately positioned and should be installed in areas with good rock integrity. Conduct water level observations within the working pipe, recording water level data every 5 minutes. When the water level drop rate is less than 5 cm / min in two consecutive observations, stop water level observations and use the last observation result as the zero line for pressure calculation. When observing the flow rate, record the flow rate data every 1 minute for five consecutive observations. If the flow rate does not show a continuous increasing trend, and the difference between the maximum and minimum values ​​among the five flow rate readings is less than 10% of the final value, or the difference is less than 1 L / min, it is determined that the seepage flow rate is stabilizing, the test at the current pressure level is ended, and the final flow rate value is taken as the calculated value. If the above stabilization conditions are not met, observations need to continue until the requirements are met. Adjust the test section pressure to the next preset value, and repeat the flow observation process described above until all pressure levels of the test section are tested.

[0024] Example 1: A double-plug water-pressurizing device for a coal mine floor waterproofing layer includes a water pump 1, a pumping pump 3, a pressure stabilizing tank 4, a pressurizing water pipe 7, a manual pressurizing pump 8, and a drilling rig 12. The outlet of the water pump 1 is connected to the pumping end of the pumping pump 3 via a first flexible hose 2. The outlet of the pumping pump 3 is connected to one end of the pressure stabilizing tank 4 via the first flexible hose 2. The other end of the pressure stabilizing tank 4 is connected to the floor waterproofing layer 10 via a second flexible hose 9. The pressure end of the manual pressurizing pump 8 is connected to the floor waterproofing layer 10 via the pressurizing water pipe 7. The drilling rig 12 is positioned above the floor waterproofing layer 10.

[0025] In application: Connect the outlet of water pump 1 to the pumping end of water pump 3 through the first hose 2. Connect the outlet of water pump 3 to the inlet of pressure tank 4 through the first hose 2. Extend the outlet of pressure tank 4 to the test borehole of the bottom waterproof layer 10 through the second hose 9. At the same time, connect the pressure end of manual pressure pump 8 to the test borehole through the pressure pipe 7. Ensure that all interfaces are sealed to avoid pressure leakage. During commissioning, start water pump 1 and check the operating status of water pump 3 and pressure tank 4. Confirm that the pressure display of pressure tank 4 is normal and that manual pressure pump 8 can pressurize normally without pressure leakage.

[0026] Example 2: Example 2 is basically the same as Example 1, except that: The other end of the pressure stabilizing tank 4 is connected to the drill rod 11 via the second hose 9, and the top of the drill rod 11 is connected to the output end of the drilling machine 12.

[0027] When encountering significant resistance during the lowering and raising of the packer, it is necessary to use the drill rod 11 of the drilling rig 12 to lower the packer, inject water, and raise the packer. If all goes smoothly, the packer can be lowered manually using the second hose 9.

[0028] Example 3: Example 3 is basically the same as Example 1, except that: A flow meter 5 and a pressure gauge 6 are sequentially installed between the pressure stabilizing tank 4 and the second hose 9; the bottom plate water-proof layer 10 is divided into a bottom plate water-conducting destruction bag, an effective water-proof layer, and a pressurized water-conducting riser, arranged sequentially from top to bottom; an upper sealing mechanism 13 and a lower sealing mechanism 14 are respectively installed in the effective water-proof layer, the upper sealing mechanism 13 is connected to the second hose 9, and the lower sealing mechanism 14 is connected to the second hose 9; the upper sealing mechanism 13 is an upper packer or an upper water stop, and the lower sealing mechanism 14 is a lower packer or a lower water stop; a water level gauge 15 is also installed in the bottom plate water-proof layer 10.

[0029] In application: Pressure gauge 6 displays the inlet pressure of the test section in real time, and can capture pressure fluctuations instantly, ensuring that the pressure stability deviation of each stage is reduced, effectively avoiding misjudgment of seepage flow due to pressure runaway. Flow meter 5 directly reads the instantaneous flow rate, eliminating the need for manual timing and water measurement. This not only reduces human operation errors, but also allows for real-time observation of flow rate change trends. When the flow rate values ​​read for 5 consecutive times meet the condition that the difference between the maximum and minimum values ​​is less than 10% of the final value or less than 1L / min, the flow rate can be determined to be stable in real time, eliminating the need for post-testing and recording, greatly improving test efficiency, and shortening the single-stage pressure test time. The selection of the effective impermeable layer lithology can be flexibly adjusted: when the lithology is relatively intact, a water stop plug is used, which relies on mechanical compression to achieve a seal; when the lithology is slightly broken, a packer is used, which uses hydraulic expansion to fit the borehole wall, which can effectively prevent the test water from seeping into the non-test section, ensuring that the seepage flow data comes only from the test section and improving the accuracy of parameter calculation.

[0030] Example 4: Example 4 is basically the same as Example 1, except that: Before inserting the plug, the water level in the borehole must be observed and recorded once. When using a hydraulic plug, the hydraulic pressure should be set to be 0.5 MPa higher than the maximum pressure designed for the test (e.g., if the maximum pressure of the conventional water pressure test is 1.5 MPa, the hydraulic pressure should be set to 2.0 MPa), and the plug pressure should be kept stable throughout the entire test.

[0031] After the embolization is completed and the test section is isolated, the water level in the working pipe is observed. If pressurized water is found during the observation process, the pressurized water level needs to be observed simultaneously. If the pressurized water level is higher than that in the working pipe, additional pressure and leakage observations are required.

[0032] First, conduct a test water pressure test: the test pressure should be the maximum design pressure (usually 1.5 MPa), and the duration should be 15 minutes. If the plug is found to be ineffective, measures such as moving the plug, checking the plug, replacing the plug, or pouring concrete to fill the plug position should be taken. When moving the plug, its position range should not exceed the plug position of the previous test. Only after the test water pressure test is successful (the plug is well sealed and there is no pressure leakage) can the formal water pressure test of the test section be carried out.

[0033] The formal pressure test is conducted according to the "five-point method", which is divided into three pressure levels and five stages: 0.3MPa-0.6MPa-1.0MPa-0.6MPa-0.3MPa. Before the flow rate observation in each stage, the regulating valve must be adjusted to ensure that the pressure in the test section reaches the predetermined value of that stage and remains stable before the flow rate observation is carried out.

Claims

1. A double plug type water pressurizing device for coal mine floor aquifuge, characterized in that: The double-plug water pressure device of the coal mine floor waterproof layer includes a water pump (1), a water pump (3), a pressure tank (4), a pressure water pipe (7), a manual pressure pump (8), and a drilling rig (12). The outlet of the water pump (1) is connected to the pumping end of the water pump (3) through the first hose (2), the outlet of the water pump (3) is connected to one end of the pressure tank (4) through the first hose (2), and the other end of the pressure tank (4) is connected to the bottom plate waterproof layer (10) through the second hose (9). The drilling rig (12) is set above the bottom plate waterproof layer (10). The pressure end of the manual pressure pump (8) is connected to the bottom plate waterproof layer (10) through the pressure water pipe (7).

2. The double plug water pressurizing device for coal mine floor aquifuge according to claim 1, characterized in that: The other end of the pressure stabilizing tank (4) is connected to the drill rod (11) via the second hose (9), and the top of the drill rod (11) is connected to the output end of the drilling machine (12).

3. A double-plug type water-pressurizing device for the water-proof layer of a coal mine floor as described in claim 1 or 2, characterized in that: A flow meter (5) and a pressure gauge (6) are sequentially installed between the pressure stabilizing tank (4) and the second hose (9).

4. A double-plug type water-pressurizing device for the waterproof layer of a coal mine floor as described in claim 1 or 2, characterized in that: The bottom plate waterproof layer (10) is divided into a bottom plate water-conducting and breaking bag, an effective waterproof layer and a pressurized water-conducting belt arranged from top to bottom; An upper sealing mechanism (13) and a lower sealing mechanism (14) are respectively installed in the effective waterproof layer. The upper sealing mechanism (13) is connected to the second hose (9), and the lower sealing mechanism (14) is connected to the second hose (9).

5. A double-plug type water-pressurizing device for the waterproof layer of a coal mine floor as described in claim 4, characterized in that: The upper sealing mechanism (13) is an upper packer or an upper water stop, and the lower sealing mechanism (14) is a lower packer or a lower water stop.

6. A double-plug type water-pressurizing device for the waterproof layer of a coal mine floor as described in claim 5, characterized in that: A water level gauge (15) is also installed inside the waterproof layer (10) of the bottom plate.

7. A double-plug type water-pressurizing device for the water-proof layer of a coal mine floor as described in claim 1 or 2, characterized in that: Both the first hose (2) and the second hose (9) are provided with hose threads for fixing the connection.

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