CN112253247B - Gas pressure rapid measuring device and measuring method - Google Patents
Gas pressure rapid measuring device and measuring method Download PDFInfo
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- CN112253247B CN112253247B CN202010874258.XA CN202010874258A CN112253247B CN 112253247 B CN112253247 B CN 112253247B CN 202010874258 A CN202010874258 A CN 202010874258A CN 112253247 B CN112253247 B CN 112253247B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
本发明涉及煤层瓦斯压力测定技术领域，瓦斯压力快速测定装置，包括至少四个封孔胶囊、注气装置、注气管、测压管和控制装置，其中封孔胶囊在钻孔内间隔设置，形成由煤层到钻孔孔口方向依次设置的第二封孔段、注气空间和第一封孔段，测压管第一端穿过封孔胶囊和煤层延伸至测压气室，测压管第二端封闭或者安装压力表，注气管第一端敞开并设置在注气空间，注气装置连接注气管第二端，注气管上设有注气开关，所述测压管和注气管上分别设有第一压力传感器和第二压力传感器，所述控制装置与第一压力传感器、第二压力传感器以及注气开关分别信号连接，本测定装置适用于井下煤层瓦斯压力快速测定。本发明还提出瓦斯压力快速测定方法。
The invention relates to the technical field of coal seam gas pressure measurement. A gas pressure rapid measurement device comprises at least four sealing capsules, a gas injection device, a gas injection pipe, a pressure measuring pipe and a control device. The second hole sealing section, the gas injection space and the first hole sealing section are arranged in sequence from the coal seam to the borehole orifice. The first end of the pressure measuring tube extends through the sealing capsule and the coal seam to the pressure measuring gas chamber. Both ends are closed or a pressure gauge is installed, the first end of the gas injection pipe is open and set in the gas injection space, the gas injection device is connected to the second end of the gas injection pipe, the gas injection pipe is provided with a gas injection switch, the pressure measuring pipe and the gas injection pipe are respectively A first pressure sensor and a second pressure sensor are provided, and the control device is respectively signal-connected with the first pressure sensor, the second pressure sensor and the gas injection switch. The invention also proposes a rapid gas pressure determination method.
Description
Technical Field
The invention relates to the technical field of coal seam gas pressure measurement, in particular to a rapid gas pressure measurement device and a rapid gas pressure measurement method.
Background
The coal bed gas pressure is one of important parameters for gas occurrence, is an important basis for the work of coal and gas outburst identification, regional prediction, outburst elimination effect inspection and the like, and is of great importance for accurately and quickly determining the coal bed gas pressure. Researchers at home and abroad make extensive and intensive researches on rapid measurement of gas pressure. The method for measuring the coal bed gas pressure by the direct method at present is divided into two main categories: one is passive pressure measurement, and the other is active pressure measurement. The passive pressure measurement method is a pressure measurement method which depends on gradual recovery of gas generated by a coal seam after hole sealing, and the measurement period of the method is long, generally about one month. The active pressure measurement method is characterized in that gas with preset pressure is injected after pressure measurement, the gas loss amount lost in drilling construction is compensated, generally, the gas is injected once, the gas loss amount and the gas injection amount are unknown, the compensation is uncertain, and the test time of the method is reduced compared with that of active pressure measurement, but generally about 15 days are needed.
The coal bed gas pressure measured by coal bed drilling and broken rock stratum is influenced by the environment of the drilling hole, and the measured value is small. The method is mainly characterized in that broken rings are arranged on the periphery of the hole wall of a drilled hole and cannot be plugged during hole sealing, so that gas in a pressure measuring gas chamber is leaked out from cracks of the broken rings on the periphery of the hole wall of the drilled hole.
Therefore, the gas pressure measuring period and the leakage problem of the broken ring of the drill hole restrict the accurate and rapid measurement of the gas pressure of the coal bed. The rapid and accurate measurement of the coal bed gas pressure becomes an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a device and a method for quickly measuring underground coal seam gas pressure, which aim to overcome the defects and shortcomings of the prior art, are suitable for quickly measuring the underground coal seam gas pressure and solve the problems of long gas pressure measuring period and gas leakage of a broken ring of a drill hole.
In the first technical scheme, the gas pressure rapid measuring device is used for measuring the gas pressure of an underground coal seam, a borehole is arranged on the underground construction surface in the direction of the coal seam, a pressure measuring gas chamber is arranged on the back surface of the coal seam, the gas pressure rapid measuring device comprises at least four hole sealing capsules, a gas injection device, a gas injection pipe, a pressure measuring pipe and a control device, wherein the hole sealing capsules are arranged in the borehole at intervals, a second hole sealing section, a gas injection space and a first hole sealing section which are sequentially arranged from the coal seam to the direction of a drill hole orifice are formed between every two adjacent hole sealing capsules, the first end of the pressure measuring pipe penetrates through the hole sealing capsules and the coal seam and extends to the pressure measuring gas chamber, the second end of the pressure measuring pipe is sealed or provided with a pressure gauge, the first end of the pressure measuring pipe is open and arranged in the gas injection space, the gas injection device is connected with the second end of the gas injection pipe, the gas injection pipe is provided with a gas injection switch, and the pressure measuring pipe are respectively provided with a first pressure sensor and a second pressure sensor, the control device is in signal connection with the first pressure sensor, the second pressure sensor and the gas injection switch respectively, and the control device is used for receiving the gas pressure data in the pipe monitored by the first pressure sensor and the second pressure sensor and switching the on-off state of the gas injection switch.
In the first technical scheme, preferably, the drill hole is a through-layer drill hole, and the first hole sealing capsule close to the coal seam in the drill hole is positioned on the floor of the coal seam.
In the first technical solution, preferably, the drilled hole is a bedding drilled hole, and the length ratio of the second hole sealing section, the pressure measuring air chamber and the first hole sealing section is 3: 2: 20.
In a first technical scheme, as preferred, gas pressure short-term test device still has notes liquid pipe and priming device, the priming device with annotate the liquid union coupling, it includes four free liquid outlets and two pressure liquid outlets, four to annotate the liquid pipe free liquid outlet respectively with the inside intercommunication of hole sealing capsule, two the pressure liquid outlet sets up respectively at first hole sealing section and second hole sealing section, the priming device is through annotating the liquid pipe to the inside hole sealing liquid of carrying of hole sealing capsule and annotate the intraductal pressure of liquid and reach first hole sealing section and the hole sealing liquid of second hole sealing section injection after predetermineeing pressure.
In a second technical scheme, the method for rapidly measuring the gas pressure comprises the steps of using the gas pressure rapid measuring device as described in the first technical scheme to construct a drill hole with a corresponding aperture at a preset position by using a drilling machine, after the drill hole construction is finished, putting a pressure measuring pipe and a hole sealing capsule into a specified position in the drill hole, after the hole sealing capsule seals the drill hole, opening a control device to monitor the coal bed gas pressure P1 in the pressure measuring pipe and the gas pressure P2 in a gas injection space, and calculating the difference value delta P between the two; when the delta P is greater than or equal to the preset value of 0.1MPa, the control device sends a signal to the gas injection switch to open the gas injection switch, and gas in the gas injection device is injected into the gas injection space through the gas injection switch; and when the delta P is less than the preset value of 0.1MPa, the control device sends a signal to the gas injection switch to close the gas injection switch, the gas injection device stops injecting gas into the gas injection space until the delta P is equal to the preset value of 0.1MPa and does not change any more or changes less than 0.015MPa within 3 days, and the measured pressure P1 is the coal bed gas pressure.
The invention has the beneficial effects that:
1. compared with the traditional method for passively compensating and testing the gas pressure of the coal bed, the method disclosed by the invention can be used for rapidly and accurately testing the gas pressure of the coal bed.
2. The segmented hole sealing utilizes a pressure progressive compensation principle, not only can the leakage of coal seam gas through a broken ring of a drill hole and cracks around the drill hole be reduced, but also the gas is continuously supplied to a gas injection space by utilizing program control in the coal seam gas pressure recovery process, the method of gradually approaching the coal seam gas pressure is realized, and the coal seam gas pressure is quickly recovered to the original coal seam gas pressure.
3. Gas injection compensation adopts the mode of successive approximation, though adopt initiative pressure measurement, but gas injection pressure is less than the certain numerical value of recovery pressure all the time, is recovering in fact fast because drilling construction influences release gas pressure, does not influence the final pressure measurement accuracy in coal seam.
4. The adoption of the program control mode can facilitate the operation and reduce the response time of manual operation.
Drawings
FIG. 1 is a schematic view of the overall structure of the gas pressure rapid measurement device according to the present invention.
The reference numerals include:
1-a gas injection device, 2-a gas injection switch, 3-a control device, 4-a gas injection pipe, 5-a drill hole, 6-a hole sealing capsule, 7-a liquid injection pipe, 8-a pressure measuring pipe, 9-a hole sealing liquid, 10-a coal bed, 11-a first hole sealing section, 12-a gas injection space, 13-a second hole sealing section, 14-a pressure measuring gas chamber, 15-a first pressure sensor, 16-a second pressure sensor and 17-a liquid injection device.
Detailed Description
The present invention is described in detail below with reference to the attached drawings.
Example 1
As shown in fig. 1, the gas pressure rapid measurement apparatus in this embodiment is used for measuring gas pressure of a coal seam 10 in a well, and a borehole 5 is formed in a direction facing the coal seam 10 in the well, and a pressure measurement chamber 14 is formed in a back surface of the coal seam, and the gas pressure rapid measurement apparatus includes at least four hole sealing capsules 6, a gas injection apparatus 1, a gas injection pipe 4, a pressure measurement pipe 8 and a control apparatus 3, wherein the hole sealing capsules 6 are arranged at intervals in the borehole 5, a second hole sealing section 13, a gas injection space 12 and a first hole sealing section 11 are formed between two adjacent hole sealing capsules 6 and sequentially arranged in a direction from the coal seam 10 to the borehole 5, a first end of the pressure measurement pipe 8 passes through the hole sealing capsules 6 and the coal seam 10 and extends to the pressure measurement chamber 14, a second end of the pressure measurement pipe 8 is sealed or is provided with a pressure gauge, a first end of the gas injection pipe 4 is open and arranged in the gas injection space 12, the gas injection apparatus 1 is connected to a second end of the gas injection pipe 4, be equipped with gas injection switch 2 on the gas injection pipe 4, be equipped with first pressure sensor 15 and second pressure sensor 16 on pressure-measuring pipe 8 and the gas injection pipe 4 respectively, controlling means 3 and first pressure sensor 15, second pressure sensor 16 and gas injection switch 2 are signal connection respectively, and this controlling means 3 is used for receiving the intraductal atmospheric pressure data that first pressure sensor 15, second pressure sensor 16 monitored and switches the on-off state of gas injection switch 2.
The drill hole 5 is a through-layer drill hole, and the first hole sealing capsule 6 close to the coal seam 10 in the drill hole 5 is positioned on the bottom plate of the coal seam 10.
The drill hole 5 is a bedding drill hole, and the length ratio of the second hole sealing section 13, the pressure measuring air chamber 14 and the first hole sealing section 11 is 3: 2: 20.
Gas pressure spot test device still has notes liquid pipe 7 and priming device 17, priming device 17 with annotate liquid pipe 7 and be connected, annotate liquid pipe 7 and include four free liquid outlets and two pressure liquid outlets, four free liquid outlets respectively with the inside intercommunication of hole sealing capsule 6, two pressure liquid outlets set up respectively at first hole sealing section 11 and second hole sealing section 13, priming device 17 pours into hole sealing liquid 9 into to the inside hole sealing liquid 9 of carrying of hole sealing capsule 6 and after annotating liquid pipe 7 internal pressure and reaching preset pressure into first hole sealing section 11 and second hole sealing section 13 into hole sealing liquid 9 through annotating liquid pipe 7.
The gas injection device 1 is used for providing a compensation gas source for the gas injection space 12, the gas injection switch 2 is used for controlling the gas injection device 1 to open and close the gas source for the gas injection space 12, the control device 3 is used for monitoring the pressure measuring pipe 8, namely the pressure P1 of the coal seam 10 gas in the pressure measuring gas chamber 14 and the pressure P2 of the gas in the gas injection space 12, calculating the difference value delta P between the two values P1-P2, and simultaneously opening and closing the gas injection switch 2 to inject gas into the gas injection space 12. The gas injection pipe 4 is a passage for transporting gas in the gas injection apparatus 1 to the gas injection space 12. The borehole 5 is a space for pressure measurement, hole sealing, gas injection, and the like. The hole sealing capsule 6 is used for dividing the drill hole 5 into different spaces and sealing the drill hole 5 to prevent gas from leaking to the outer space. The liquid injection pipe 7 is a passage for injecting the sealing liquid 9 into the sealing capsule 6. The pressure measuring pipe 8 is a passage for gas in the pressure measuring gas chamber 14 to be conducted to the outside of the drill hole 5 for testing; the hole sealing liquid 9 is a medium for filling the hole sealing capsules 6 to ensure that the capsules can fully seal the drill holes 5 to prevent air leakage; the coal seam 10 is the primary source of gas; the first hole sealing section 11 is used for sealing the drill hole 5 and preventing gas in a pressure measuring gas chamber 14 and a coal seam 10 in the drill hole 5 from leaking to the outside of the drill hole 5; the gas injection space 12 is used for creating a compensation gas source, one is for compensating the pressure relief gas amount in the construction process of the drill hole 5, and the other is for preventing the gas from leaking out of the drill hole 5 from the coal seam 10 and the pressure measurement gas chamber 14 in the broken circle of the drill hole 5 around the second hole sealing section 13, so that the accuracy of measuring the gas pressure of the coal seam 10 is influenced. The second hole sealing section 13 is a first sealing line for preventing the gas in the pressure measuring gas chamber 14 from leaking outwards; the manometric cell 14 is a space for creating gas accumulation in the coal seam 10 and reaching the original gas pressure of the coal seam 10.
Example 2
The gas pressure rapid measurement apparatus in example 1 was used as the gas pressure rapid measurement method.
A drill hole 5 of a corresponding bore diameter is made at a predetermined position by means of a drilling machine, the drill hole 5 being made through the coal seam 10 or along the coal seam 10. After the construction of the drill hole 5 is finished, the pressure measuring pipe 8, the hole sealing capsule 6 and the liquid injection pipe 7 are placed at the appointed position in the drill hole 5, and the hole sealing liquid 9 is injected into the capsule and the appointed space of the drill hole 5 by the liquid injection pipe 7 to seal the drill hole 5. The hole sealing capsules 6 are divided into 4, and the drilled holes 5 are divided into a pressure measuring air chamber 14, a second hole sealing section 13, an air injection space 12 and a first hole sealing section 11 from inside to outside. After hole sealing, the opening control device 3 monitors the coal seam 10 gas pressure P1 in the pressure measuring pipe 8 and the gas pressure P2 in the gas injection space 12, and calculates the difference value delta P between the two, when the delta P is larger than or equal to a preset value (0.1MPa), the control device 3 sends a signal to the gas injection switch 2 to open the gas injection switch, the gas in the gas injection device 1 is injected into the gas injection space 12 through the gas injection switch 2, when the delta P is smaller than the preset value (0.1MPa), the control device 3 sends a signal to the gas injection switch 2 to close the gas injection switch, and the gas injection device 1 stops injecting gas into the gas injection space 12. And repeatedly injecting gas until the delta P is equal to the preset value (0.1MPa) and does not change or the change is less than 0.015MPa within 3 days, wherein the measured pressure P1 is the coal seam 10 gas pressure.
The foregoing is only a preferred embodiment of the present invention, and many variations in the detailed description and the application range can be made by those skilled in the art without departing from the spirit of the present invention, and all changes that fall within the protective scope of the invention are therefore considered to be within the scope of the invention.
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| CN113216940B (en) * | 2021-04-27 | 2022-04-15 | 中国平煤神马能源化工集团有限责任公司 | Multi-point rock stratum pore pressure testing method and system |
| CN115962012B (en) * | 2022-11-06 | 2026-01-23 | 中国建筑第七工程局有限公司 | Application method of device for monitoring front stability of gas tunnel excavation face |
| CN115929284B (en) * | 2023-01-14 | 2024-08-30 | 华北科技学院(中国煤矿安全技术培训中心) | Prediction method for rising trend of gas pressure of pressure measuring drill hole |
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