Gas pressure measuring device
By designing a passive measurement device for gas pressure at the bottom of the directional long drilling hole, the combination of grouting pipe and sealing parts is used to solve the problems of not tight sealing holes and easy damage to the grouting pipe in the underground gas pressure measurement method of coal mines, and the problem of failure of grouting pipes is achieved. The accuracy and real-time performance of gas pressure measurement can be carried out at a long distance.
Patent Information
- Application Number
- CN202411545425.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-02-14
AI Technical Summary
The existing coal seam gas pressure measurement methods for coal seams under coal mines include poor sealing holes, easy damage to the grouting pipe, loss of pressure drop during gas pressure conduction, short pressure measurement distance, inability to achieve long-distance precision testing, difficulty in controlling the position of the pressure measuring pipe, and pressure Problems such as large losses, inaccurate measurement results and poor real-time performance.
A passive measuring device for gas pressure at the bottom of the directional long drilling hole is designed, including a grouting tube, a first sealing piece, a second sealing piece and a detection piece. The combination of the grouting tube and the sealing piece is formed to form a sealed Grouting area reduces gas pressure loss and improves the accuracy and real-timeness of the measurement results.
The accuracy and real-time performance of the gas pressure measurement results are achieved, the gas pressure loss is reduced, the pressure drop loss of the pressure measuring tube is avoided, and the coal seam gas pressure can be accurately measured from a long distance without relying on tunnel engineering.
Smart Images
Figure CN119434963A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a passive measuring device for gas pressure at the bottom of a directional long borehole. Background Art
[0002] Coal seam gas pressure is the force generated by the free thermal motion and collision of gas molecules in the pores of coal seams. When other conditions are the same, the greater the coal seam gas pressure, the greater the gas content of coal, the danger of coal and gas outburst, and the gas outburst volume during coal seam mining. Therefore, the coal seam gas pressure index is the main basis for the identification, prediction, extraction design, and outburst elimination effect inspection of coal and gas outburst danger.
[0003] In the related technology, the coal seam gas pressure in coal mines is measured by short boreholes. After the borehole construction is completed, the borehole is flushed and the drill rod is withdrawn. The pressure measuring tube is inserted into the borehole and sealed to form a closed pressure measuring cavity. The pressure gauge is installed at the outer end of the hole through the connecting vessel principle to read the gas pressure value. The short borehole measurement leads to inaccurate test results and long measurement time. Summary of the invention
[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems:
[0005] In the related art, there are several problems in the coal seam gas pressure measurement method: (1) Due to the relatively loose structure of the coal seam or the large number of cracks generated by the coal and rock layers due to the tunnel excavation, the sealing hole is not tight, and the gas pressure measurement is distorted; (2) The sealing hole grouting pipe is easily rubbed against the hole wall when it is transported along the borehole, causing the grouting pipe to be damaged and affecting the test results; (3) There is a pressure drop loss in the process of gas pressure being transmitted from the pressure measuring chamber along the pressure measuring tube to the hole mouth, resulting in a smaller measurement result; (4) Due to the limitations of coal and rock tunnel engineering and ordinary drilling construction technology, the ordinary drilling pressure measurement method cannot achieve long-distance coal and rock tunnel engineering. (5) In the related technologies, the pressure measurement method lacks rapid identification technology in the pressure measurement leakage verification; (6) The pressure measurement method has a short gas pressure measurement distance and is heavily dependent on the pressure measurement of tunnel engineering, which cannot accurately test the coal seam gas pressure over long distances; (7) The position of the grouting pipe and the conductor along the pressure measurement method cannot be controlled, and the grouting pipe and the conductor are easily damaged by friction with the hole wall; (8) The pressure measurement tube of the pressure measurement method has pressure drop loss, which affects the accuracy and real-time performance of the measurement results; (9) The pressure measurement method cannot automatically identify system leakage during the pressure measurement process and issue an early warning.
[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.
[0007] To this end, an embodiment of the present invention provides a gas pressure measuring device with accurate measurement results and short measurement time.
[0008] The gas pressure measuring device according to an embodiment of the present invention comprises: a grouting pipe, one end of which is suitable for being inserted into a borehole, and the other end of which extends out of the borehole; a first plugging member, which is connected to one end of the grouting pipe and is suitable for being inserted into the borehole, so that slurry flows into the first plugging member through the grouting pipe to expand the first plugging member; a second plugging member, which is inserted into the grouting pipe and connected to the grouting pipe, the first plugging member and the second plugging member are spaced apart along the length direction of the grouting pipe to form a grouting area, and the second plugging member is suitable for being inserted into the borehole, so that the slurry flows into the second plugging member through the grouting pipe so that the second sealing member can expand; a detecting member, which is arranged on a side of the first sealing member away from the second sealing member, and the detecting member is used to detect the pressure of the gas in the bottom of the borehole, and the gas pressure measuring device has a first working state and a second working state. In the first working state, the grouting pipe injects grout into the first sealing member and the second sealing member to make the first sealing member and the second sealing member expand to block the grouting area, and in the second working state, when the pressure of one of the first sealing member and the second sealing member is higher than a first preset value, the grouting pipe is connected with the grouting area, so that the slurry is filled in the grouting area to make the slurry block the cracks in the grouting area.
[0009] The gas pressure measuring device of the embodiment of the present invention is provided with a grouting pipe, a first sealing part, a second sealing part and a detection part, which can seal the cracks in the borehole, ensure the sealing of the pressure measuring chamber and the detection result of the detection part, reduce the pressure loss of the gas, improve the accuracy of the measurement result and realize the real-time reading.
[0010] In some embodiments, the gas pressure measuring device also includes a first valve, which is arranged on the side of the first sealing member facing the second sealing member. In the first working state, one end of the grouting pipe is connected to the first sealing member through the first valve, so that the grouting pipe injects grout into the first sealing member through the first valve to expand the first sealing member. In the second working state, the first valve is disconnected from the first sealing member so that the slurry is filled in the grouting area.
[0011] In some embodiments, the gas pressure measuring device also includes a straightening piece, which is passed through the grouting pipe and is suitable for being arranged in the drill hole. The straightening piece is located on the side of the second sealing piece away from the first sealing piece and is spaced apart from the second sealing piece along the length direction of the grouting pipe.
[0012] In some embodiments, the gas pressure measuring device also includes a third working state and a fourth working state. In the third working state, when the pressure of the slurry between the first sealing member and the second sealing member is higher than a second preset value, the slurry will push the second sealing member to move toward the direction adjacent to the straightening member to expand the grouting range. In the fourth working state, the second sealing member is offset against the straightening member so that when the pressure in the second sealing member is higher than the third preset value, the grouting pipe stops grouting.
[0013] In some embodiments, the gas pressure measuring device also includes a second valve, which is arranged on the second sealing member. In the first working state, the second working state and the third working state, the grouting pipe can inject grout into the second sealing member to expand the second sealing member. In the fourth state, when the pressure inside the second sealing member is higher than a third preset value, the second valve is activated to reduce the pressure inside the second sealing member, and the grouting pipe stops injecting grout into the second sealing member.
[0014] In some embodiments, the gas pressure measuring device also includes an early warning detection component, which is arranged at the other end of the grouting pipe and is suitable for being arranged outside the borehole. The early warning detection component is used to detect the gas concentration outside the borehole and the gas pressure outside the borehole, so that when the early warning detection component detects that the gas concentration outside the borehole or the gas pressure outside the borehole is higher than a preset value, the early warning detection component sends out an alarm. The early warning detection component is connected to the detection component, so that when the detection component detects that the pressure drop rate in the borehole is higher than a preset value, the early warning detection component sends out an alarm.
[0015] In some embodiments, the gas pressure measuring device also includes a grouting pump, which is disposed at the other end of the grouting pipe and is connected to the other end of the grouting pipe so that the slurry is transported into the grouting pipe through the grouting pump.
[0016] In some embodiments, the first blocking member is a packer, and the second blocking member is a pressure-controlled capsule. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic structural diagram of a gas pressure measuring device according to an embodiment of the present invention.
[0018] Gas pressure measuring device 100;
[0019] Grouting pipe 1; first plugging part 2; first valve 3; second plugging part 4; detection part 5; straightening part 6; early warning detection part 7; second valve 8; grouting pump 9; borehole 10; pressure measuring chamber 11; grouting area 12. DETAILED DESCRIPTION
[0020] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0021] A gas pressure measuring device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
[0022] like Figure 1 As shown, a gas pressure measuring device 100 according to an embodiment of the present invention includes a grouting pipe 1, a first blocking member 2, a second blocking member 4 and a detection member 5.
[0023] One end of the grouting pipe 1 is suitable for being inserted into the borehole 10, and the other end of the grouting pipe 1 extends out of the borehole 10. Figure 1 As shown, the grouting pipe 1 is a pipe extending in the left-right direction and can be inserted into the borehole 10. The right end of the grouting pipe 1 is the inlet of the grouting pipe 1 and is located outside the borehole 10, and the left end of the grouting pipe 1 is the outlet and is located inside the borehole 10, so that the slurry can pass into the borehole 10 through the grouting pipe 1.
[0024] The first plugging member 2 is connected to one end of the grouting pipe 1 and is suitable for being inserted into the borehole 10 so that the slurry flows into the first plugging member 2 through the grouting pipe 1 to expand the first plugging member 2. Figure 1 As shown, the first sealing member 2 is arranged at the left end of the grouting pipe 1 and is connected to the outlet of the grouting pipe 1. The first sealing member 2 is spaced apart from the bottom of the borehole 10 (i.e., the left end face of the borehole 10). Thus, the slurry is injected into the first sealing member 2 through the grouting pipe 1, so that the first sealing member 2 expands so that the first sealing member 2 is spaced apart from the bottom of the borehole 10 to form a pressure measuring chamber 11.
[0025] The second plugging member 4 is disposed on the grouting pipe 1 and is connected to the grouting pipe 1. The first plugging member 2 and the second plugging member 4 are connected along the length direction of the grouting pipe 1 (such as Figure 1 The second plugging member 4 is arranged at intervals in the left and right directions as shown to form a grouting area 12, and the second plugging member 4 is suitable for being penetrated in the borehole 10 so that the slurry flows into the second plugging member 4 through the grouting pipe 1 to expand the second plugging member 4. Specifically, as Figure 1 As shown, the second sealing member 4 is passed through the grouting pipe 1 and is connected to the grouting pipe 1, the first sealing member 2 and the second sealing member 4 are spaced apart in the left and right directions, and the second sealing member 4 can be passed through the borehole 10. Thus, the second sealing member 4 is grouted through the grouting pipe 1, so that the second sealing member 4 expands to seal the borehole 10, so that the first sealing member 2, the second sealing member 4 and the borehole 10 define a grouting area 12.
[0026] The detection member 5 is arranged on a side of the first sealing member 2 away from the second sealing member 4. The detection member 5 is used to detect the pressure of the gas in the bottom of the borehole 10. The gas pressure measuring device 100 has a first working state and a second working state. In the first working state, the grouting pipe 1 grouts the first sealing member 2 and the second sealing member 4 to make the first sealing member 2 and the second sealing member 4 expand to seal the grouting area 12. In the second working state, when the pressure of one of the first sealing member 2 and the second sealing member 4 is higher than a first preset value, the grouting pipe 1 is connected to the grouting area 12 so that the slurry is filled in the grouting area 12 so that the slurry seals the borehole 10 and cracks in the grouting area 12.
[0027] Specifically, Figure 1 As shown, the detection member 5 is an air pressure sensor and is arranged in the pressure measuring chamber 11 and on the left side of the first sealing member 2. The detection member 5 can be used to detect the gas pressure in the bottom of the borehole 10. The first working state is the sealing state. The grouting pipe 1 can grout the first sealing member 2 and the second sealing member 4, so that the first sealing member 2 and the second sealing member 4 expand to fit the inner circumferential surface of the borehole 10, thereby sealing the pressure measuring chamber 11 and the grouting area 12. The second working state is the grouting state. When the pressure of the slurry in the first sealing member 2 is higher than the preset value, or the pressure of the slurry in the second sealing member 4 is higher than the preset value, the grouting pipe 1 is connected with the grouting area 12, so that the slurry is injected into the grouting area 12, so that the slurry is filled in the grouting area 12 and the slurry flows into the crack through the grouting area 12 to seal the crack, thereby ensuring the detection efficiency of the detection member 5.
[0028] The gas pressure measuring device 100 of the embodiment of the present invention is provided with a grouting pipe 1, a first sealing member 2, a second sealing member 4 and a detection member 5. The cracks in the borehole 10 can be sealed by the grouting pipe 1, the first sealing member 2 and the second sealing member 4, thereby ensuring the sealing of the pressure measuring chamber 11 and the detection result of the detection member 5, reducing the pressure loss of the gas, eliminating the need to set up a pressure measuring tube, eliminating the pressure drop loss of the pressure measuring tube in the pressure measuring method in the related technology, improving the accuracy of the measurement results and realizing the real-time reading.
[0029] In some embodiments, the gas pressure measuring device 100 further includes a first valve 3, which is disposed on a side of the first plugging member 2 facing the second plugging member 4. In a first working state, one end of the grouting pipe 1 is connected to the first plugging member 2 through the first valve 3, so that the grouting pipe 1 injects grout into the first plugging member 2 through the first valve 3 to expand the first plugging member 2. In a second working state, the first valve 3 is disconnected from the first plugging member 2, so that the slurry is filled in the grouting area 12. Specifically, as Figure 1As shown, the first valve 3 is a one-way pressure relief valve and is arranged on the right side of the first plugging member 2. The inlet of the grouting pipe 1 is connected to the first plugging member 2 through the first valve 3. In the first working state, the first valve 3 is in a normal working state, and the slurry can flow into the first plugging member 2 through the grouting pipe 1, so that the first plugging member 2 blocks the borehole 10. In the second working state, the pressure in the first plugging member 2 is the first preset value P1, the first plugging member 2 is started and disconnected from the first valve 3, and the first plugging member 2 is still in an expanded state. The outlet of the grouting pipe 1 is connected to the grouting area 12, so that the grouting pipe 1 grouts the grouting area 12, and the slurry will flow into the crack through the grouting area 12.
[0030] In some embodiments, the gas pressure measuring device 100 further includes a straightening member 6, which is inserted into the grouting pipe 1 and is suitable for being arranged in the borehole 10. The straightening member 6 is located on the side of the second plugging member 4 away from the first plugging member 2 and is spaced apart from the second plugging member 4 along the length direction of the grouting pipe 1. Specifically, Figure 1 As shown, the straightening member 6 is a straightening device and can be arranged in the borehole 10. The straightening member 6 is provided with a through hole that penetrates the straightening member 6 in the left-right direction. The grouting pipe 1 is penetrated through the through hole and is arranged on the straightening member 6. The straightening member 6 is located on the right side of the second blocking member 4 and is spaced apart from the second blocking member 4 in the left-right direction. Therefore, the straightening member 6 supports the grouting pipe 1, which can effectively avoid damage caused by friction between the conductor, the grouting pipe 1 and the hole wall, prevent the grouting pipe 1 from being worn when installed in the borehole 10, and avoid pressure drop loss of gas pressure.
[0031] In some embodiments, the number of the straightening members 6 may be multiple, and the multiple straightening members 6 are arranged on the grouting pipe 1 at intervals along the length direction of the grouting pipe 1. Thus, the grouting pipe 1 is supported by the multiple straightening members 6.
[0032] In some embodiments, the gas pressure measuring device 100 further includes a third working state and a fourth working state. In the third working state, when the pressure of the slurry between the first plugging member 2 and the second plugging member 4 is higher than the second preset value, the slurry will push the second plugging member 4 to move toward the direction of the adjacent straightening member 6 to expand the grouting range. In the fourth working state, the second plugging member 4 and the straightening member 6 are against each other, so that when the pressure in the second plugging member 4 is higher than the third preset value, the grouting pipe 1 stops grouting. Specifically, as Figure 1As shown, in the third working state, the slurry pressure in the grouting area 12 is higher than the second preset value P2. At this time, the pressure in the grouting area 12 is higher than the friction between the second plugging member 4 and the inner circumference of the borehole 10, so that the slurry can push the second plugging member 4 to move to the right, thereby gradually expanding the grouting area 12 to ensure the grouting pressure and grouting quality. In the fourth working state, the second plugging member 4 moves to the left side of the straightening member 6 and abuts against the straightening member 6, and the grouting area 12 is continuously grouted. When the slurry in the second plugging member 4 is higher than the third preset value P3, the grouting pipe 1 stops grouting.
[0033] In some embodiments, the gas pressure measuring device 100 further includes a second valve 8, which is disposed on the second plugging member 4. In the first working state, the second working state, and the third working state, the grouting pipe 1 can inject grout into the second plugging member 4 to expand the second plugging member 4. In the fourth working state, when the pressure in the second plugging member 4 is higher than the third preset value, the second valve 8 is activated to reduce the pressure in the second plugging member 4, and the grouting pipe 1 stops injecting grout into the second plugging member 4. Specifically, Figure 1 As shown, the second valve 8 is a one-way valve and is arranged on the second blocking piece 4 and is connected to the second blocking piece 4. In the first working state, the second working state and the third working state, the grouting pipe 1 injects slurry into the second blocking piece 4 to expand the second blocking piece 4. In the fourth working state, when the slurry pressure in the second blocking piece 4 is greater than the third preset value P3, the second valve 8 can be started to cause a one-way explosion, so that the second valve 8 can relieve the pressure on the second blocking piece 4 and can prompt the operator to stop grouting the second blocking piece 4, so as to prevent the second blocking piece 4 from being subjected to excessive slurry pressure, resulting in damage to the second blocking piece 4, thereby ensuring the service life of the second blocking piece 4.
[0034] In some embodiments, the gas pressure measuring device 100 further includes an early warning detection member 7, which is arranged at the other end of the grouting pipe 1 and is suitable for being arranged outside the borehole 10. The early warning detection member 7 is used to detect the gas concentration and gas pressure outside the borehole 10, so that when the early warning detection member 7 detects that the gas concentration or gas pressure outside the borehole 10 is higher than a preset value, the early warning detection member 7 sends out an alarm. The early warning detection member 7 is connected to the detection member 5, so that when the detection member 5 detects that the pressure drop speed in the borehole 10 is higher than a preset value, the early warning detection member 7 sends out an alarm. Specifically, as Figure 1As shown, the early warning detection element 7 is a data acquisition and early warning device. The early warning detection element 7 can be set outside the borehole 10 and near the orifice of the borehole 10. Thus, the gas concentration near the orifice of the borehole 10 and the gas pressure near the orifice of the borehole 10 are detected by the early warning detection element 7. When the gas concentration and gas pressure in the air at the orifice of the borehole 10 are significantly higher than the gas concentration in other areas of the tunnel, it means that the borehole 10 is not tightly sealed, and the early warning detection element 7 issues an alarm to remind the operator to re-grout the borehole 10. The early warning detection element 7 can be electrically connected to the detection element 5 through a wire. Thus, when the gas pressure detected by the detection element 5 drops significantly in a short period of time, it means that the borehole 10 is not tightly sealed, and the early warning detection element 7 will issue an acoustic and electrical alarm, and the borehole 10 needs to be re-grouted and sealed.
[0035] In some embodiments, the gas pressure measuring device 100 further includes a grouting pump 9, which is disposed at the other end of the grouting pipe 1 and communicated with the other end of the grouting pipe 1, so that the slurry is transported into the grouting pipe 1 through the grouting pump 9. Figure 1 As shown, the grouting pump 9 is connected to the inlet of the grouting pipe 1 and is located outside the borehole 10, whereby the slurry is continuously transported to the grouting pipe 1 through the grouting pump 9 and flows into the first plugging piece 2, the second plugging piece 4 and the grouting area 12 through the grouting pipe 1.
[0036] In some embodiments, the first plugging member 2 is a packer. Since the packer usually expands first during the grouting process and contacts the borehole wall of the borehole 10 to form a preliminary seal, it helps to establish the basic conditions of the pressure measuring chamber 11 and can withstand a certain pressure without moving easily, which helps to maintain the sealing state of the pressure measuring chamber 11. Therefore, the first plugging member 2 is a packer, which can make the first plugging member 2 more reasonably set.
[0037] In some embodiments, the second plugging member 4 is a pressure-controlled capsule. Since the pressure-controlled capsule can move along the borehole 10 under the action of the grouting pressure, it helps to better adapt to the irregular shape of the borehole wall, improve the sealing effect, and reduce the risk of gas leakage. Therefore, the second plugging member 4 is a pressure-controlled capsule, which can make the second plugging member 4 more reasonably set.
[0038] According to the following Figure 1 Specifically, the gas pressure measuring device 100 of the embodiment of the present invention includes a grouting pipe 1, a first plugging member 2, a first valve 3, a second plugging member 4, a detection member 5, a straightening member 6, an early warning detection member 7, a second valve 8, a grouting pump 9, and a conductor;
[0039] The straightening member 6 is provided with a first through hole and a second through hole, one end of the wire extends out of the hole and is connected to the early warning detection member 7, and the other end of the wire passes through the first through hole on the straightening member 6, the side wall of the second blocking member 4, and the side wall of the first blocking member 2 in sequence and then extends into the pressure measuring chamber 11;
[0040] One end of the grouting pipe 1 extends out of the orifice and is connected to the grouting pump 9, and the other end passes through the second through hole and is connected to one side of the second blocking member 4, and extends from the other side of the second blocking member 4 and is connected to the first valve 3 and the first blocking member 2 in sequence;
[0041] The straightening member 6 guides the conductor and the grouting pipe 1 to ensure that they are not damaged by friction with the hole wall during and after being put into the borehole 10. Of course, multiple straightening members 6 can be arranged at intervals according to the length of the borehole 10.
[0042] The detection element 5 can monitor the gas pressure of the pressure measuring chamber 11 in real time, and can transmit the pressure measuring data to the early warning detection element 7 outside the hole through the wire. The gas pressure and the gas concentration in the air at the hole can be read through the early warning detection element 7. When the gas pressure or the gas concentration in the air at the hole changes abnormally, the device can alarm through acoustic and electrical signals;
[0043] The wire passes through the gap between the second plugging member 4, the first plugging member 2 and the hole wall. When the first plugging member 2 is grouting and expanding, the hole wall, the wire and the first plugging member 2 can fit tightly together to plug the borehole 10. When the second plugging member 4 is grouting and expanding, the hole wall, the wire and the second plugging member 4 can fit tightly together to plug the borehole 10.
[0044] The grouting pipe 1 is connected with the second plugging piece 4 and the first plugging piece 2, that is, the slurry can be injected into the second plugging piece 4 and the first plugging piece 2 through the grouting pipe 1;
[0045] A first valve 3 is provided between the grouting pipe 1 and the first plugging member 2. When the grouting pressure reaches a first preset value P1, the first valve 3 is activated and disconnected from the first plugging member 2, and the first plugging member 2 can still maintain an expanded plugging state;
[0046] When the grouting pressure reaches the second preset value P2 and is greater than the friction resistance between the second plugging member 4 and the hole wall, the second plugging member 4 will move along the borehole 10 toward the hole opening under the action of the grouting pressure until it is stopped by the straightening member 6;
[0047] The second plugging member 4 is provided with a second valve 8. When the grouting pressure rises to a third preset starting pressure value P3 of the second valve 8, the second valve 8 will be started, and at this time, the second plugging member 4 still maintains an expanded plugging state;
[0048] The relationship between the three critical pressures during grouting is: P1 <P2<P3。
[0049] The working process of the gas pressure measuring device 100 of the embodiment of the present invention is as follows:
[0050] Use a kilometer drilling rig to construct a kilometer borehole 10 along or through the layer according to the designed parameters, and withdraw the drill rod after the construction of the borehole 10 is completed;
[0051] The components of a passive gas pressure measuring device for a directional long borehole 10 are pre-connected, and the measuring device is sent to a predetermined position of the borehole 10 by a directional drilling machine, wherein a distance of about 2 m is left between the first plugging member 2 and the bottom of the hole as a pressure measuring chamber 11;
[0052] The grouting pipe 1 is connected to the grouting pump 9, and the grouting pump 9 is used to inject the slurry into the second plugging member 4 and the first plugging member 2. After the second plugging member 4 and the first plugging member 2 expand, they are tightly attached to the hole wall to plug the borehole 10;
[0053] When the grouting pressure reaches the first preset value P1, the first valve 3 is activated and disconnected from the first plugging member 2. The first plugging member 2 remains in an expanded plugging state, and the grouting continues. The slurry will fill the borehole 10 and the cracks in the borehole wall between the first plugging member 2 and the second plugging member 4, thereby blocking the gas.
[0054] When the grouting pressure reaches P2 and is greater than the friction resistance between the second plugging member 4 and the hole wall, the second plugging member 4 will move along the borehole 10 toward the hole opening under the action of the grouting pressure until it is stopped by the straightening member 6;
[0055] When the grouting pressure rises to the third preset value P3 of the second valve 8, the second valve 8 will be activated. At this time, the second plugging member 4 still maintains the expansion plugging state, but the pressure gauge of the grouting pump 9 will stop grouting through the prompt of the sudden pressure drop;
[0056] The detection element 5 and the early warning detection element 7 can respectively detect the gas pressure of the borehole 10 and the gas concentration in the air at the orifice. If the gas pressure drops significantly in a short period of time or the gas concentration in the air at the orifice is significantly higher than the gas concentration in other areas of the tunnel, it means that the borehole 10 is not tightly sealed. The early warning detection element 7 will issue an acoustic and electrical alarm, and the grouting and sealing of the borehole 10 and the gas replenishment operation need to be repeated;
[0057] After the borehole 10 is sealed, the gas pressure value of the early warning detection element 7 can be regarded as the gas pressure of the coal seam at that point.
[0058] In summary, the technical effects of the gas pressure measuring device 100 according to the embodiment of the present invention are as follows:
[0059] The measuring device and the measuring method will not rely on tunnel engineering, and can achieve long-distance and accurate measurement of gas pressure in the target coal seam area by directional drilling 10 "using drilling instead of tunneling";
[0060] The drill hole 10 is efficiently sealed, and the damage caused by the friction between the conductor, the grouting pipe 1 and the hole wall can be effectively avoided during the installation of the device;
[0061] It can eliminate the pressure drop loss of the pressure measuring tube in the traditional pressure measurement method, improve the accuracy of the measurement results and realize the real-time reading.
[0062] It can realize dynamic monitoring of gas pressure, drilling hole leakage and early warning functions.
[0063] The gas pressure measuring device 100 of the embodiment of the present invention can not only achieve good sealing of the pressure measuring borehole 10, prevent wear along the grouting pipe 1, and avoid pressure drop loss of gas pressure, but also can achieve long-distance pressure measurement and identification and early warning of gas leakage in the borehole 10 without a tunnel. This has important engineering significance for accurately measuring coal seam gas pressure at a long distance, timely grasping coal seam gas parameters, and scientifically guiding the prevention and control of coal mine gas disasters.
[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.
[0065] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0066] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0067] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0068] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0069] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.
Claims
1. A gas pressure measuring device, characterized in that: include: A grouting pipe, one end of which is adapted to be inserted into the borehole, and the other end of which extends out of the borehole; a first plugging member, the first plugging member being in communication with one end of the grouting pipe and being adapted to be inserted into the borehole so that slurry flows into the first plugging member through the grouting pipe to expand the first plugging member; a second plugging member, the second plugging member is inserted into the grouting pipe and communicated with the grouting pipe, the first plugging member and the second plugging member are arranged at intervals along the length direction of the grouting pipe to form a grouting area, and the second plugging member is suitable for being inserted into the borehole so that the slurry flows into the second plugging member through the grouting pipe to expand the second plugging member; A detection member is arranged on a side of the first sealing member away from the second sealing member, the detection member is used to detect the pressure of the gas in the bottom of the borehole, the gas pressure measuring device has a first working state and a second working state, in the first working state, the grouting pipe grouts the first sealing member and the second sealing member to make the first sealing member and the second sealing member expand to block the grouting area, in the second working state, when the pressure of one of the first sealing member and the second sealing member is higher than a first preset value, the grouting pipe is connected with the grouting area, so that the slurry is filled in the grouting area so that the slurry blocks the cracks in the grouting area.
2. The gas pressure measuring device according to claim 1, characterized in that: It also includes a first valve, which is arranged on a side of the first sealing member facing the second sealing member. In the first working state, one end of the grouting pipe is connected to the first sealing member through the first valve, so that the grouting pipe injects grout into the first sealing member through the first valve to expand the first sealing member. In the second working state, the first valve is disconnected from the first sealing member so that the slurry is filled in the grouting area.
3. The gas pressure measuring device according to claim 1, characterized in that: It also includes a straightening piece, which is passed through the grouting pipe and is suitable for being arranged in the drill hole. The straightening piece is located on a side of the second blocking piece away from the first blocking piece and is spaced apart from the second blocking piece along the length direction of the grouting pipe.
4. The gas pressure measuring device according to claim 3, characterized in that: The gas pressure measuring device also includes a third working state and a fourth working state. In the third working state, when the pressure of the slurry between the first sealing member and the second sealing member is higher than a second preset value, the slurry will push the second sealing member to move toward the direction adjacent to the straightening member to expand the grouting range. In the fourth working state, the second sealing member is offset against the straightening member so that the grouting pipe stops grouting when the pressure in the second sealing member is higher than the third preset value.
5. The gas pressure measuring device according to claim 4, characterized in that: It also includes a second valve, which is arranged on the second sealing member. In the first working state, the second working state and the third working state, the grouting pipe can inject grout into the second sealing member to expand the second sealing member. In the fourth state, when the pressure in the second sealing member is higher than the third preset value, the second valve is activated to reduce the pressure in the second sealing member, and the grouting pipe stops injecting grout into the second sealing member.
6. The gas pressure measuring device according to claim 1, characterized in that: It also includes an early warning detection component, which is arranged at the other end of the grouting pipe and is suitable for being arranged outside the borehole. The early warning detection component is used to detect the gas concentration outside the borehole and the gas pressure outside the borehole, so that when the early warning detection component detects that the gas concentration outside the borehole or the gas pressure outside the borehole is higher than a preset value, the early warning detection component sends out an alarm. The early warning detection component is connected to the detection component, so that when the detection component detects that the pressure drop speed in the borehole is higher than a preset value, the early warning detection component sends out an alarm.
7. The gas pressure measuring device according to claim 1, characterized in that: It also includes a grouting pump, which is arranged at the other end of the grouting pipe and communicated with the other end of the grouting pipe, so that the slurry is transported into the grouting pipe through the grouting pump.
8. The gas pressure measuring device according to claim 1, characterized in that: The first blocking member is a packer, and the second blocking member is a pressure-controlled capsule.