CN210714675U - Gas pressure measuring device and gas pressure measuring system - Google Patents

Gas pressure measuring device and gas pressure measuring system Download PDF

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Publication number
CN210714675U
CN210714675U CN201921729397.2U CN201921729397U CN210714675U CN 210714675 U CN210714675 U CN 210714675U CN 201921729397 U CN201921729397 U CN 201921729397U CN 210714675 U CN210714675 U CN 210714675U
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China
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pressure measuring
gas pressure
pipe
chamber
drain pipe
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CN201921729397.2U
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Chinese (zh)
Inventor
安世岗
王凯
李鹏
徐超
赵美成
蔡永博
叶庆树
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Shenhua Shendong Coal Group Co Ltd
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Shenhua Shendong Coal Group Co Ltd
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Abstract

The utility model discloses a gas pressure measuring device and a gas pressure measuring system, which comprises a sleeve, a pressure measuring pipe and a drain pipe; the sleeve is internally provided with a separation flange which separates the sleeve into an upper filling chamber and a lower air chamber; the lower end of the pressure measuring pipe penetrates through the separating flange and is positioned in the lower air chamber, the upper end of the pressure measuring pipe is positioned above the upper filling chamber, and the upper end of the pressure measuring pipe is connected with a pressure measuring meter; the lower end of the drain pipe penetrates through the separation flange and is inserted into the lower air chamber, and the upper end of the drain pipe is positioned above the upper filling chamber; the upper filling chamber is filled with a filling body. The utility model discloses a gas pressure measurement device and gas pressure measurement system can the accurate measurement measure coal seam gas pressure value, has especially solved the coal seam gas pressure measurement's when meeting the aquifer difficult problem of drilling downwards to wearing the layer.

Description

Gas pressure measuring device and gas pressure measuring system
Technical Field
The utility model relates to a gas pressure measurement technical field especially relates to a gas pressure measurement device and gas pressure measurement system.
Background
The occurrence geological conditions of coal in China are complex, the gas content and pressure of a coal seam are increased along with the increase of the coal mining depth, the gas disaster risk is increased, and the gas disaster prevention is the important factor in guaranteeing the coal safety mining work. The coal bed gas pressure value is one of important indexes for identifying the grade of a gas mine and formulating a gas extraction scheme. The measurement of the coal bed gas pressure is an important content of the coal mine safety production work, and whether the measurement of the coal bed gas pressure value is accurate or not directly influences the coal mine safety production.
In the coal occurrence conditions of China, coal seams are often caused by water or adjacent aquifers. In the pressure measuring process, the hole sealing pressure measuring difficulty is increased due to water gushing of the drill hole. In the existing measuring method, the hole sealing process is not suitable for sealing holes of water-containing drilled holes partly because of the problem of the hole sealing process, and the success rate is low partly because the hole sealing process is complicated. Therefore, how to accurately, conveniently and economically realize the measurement of the gas pressure of the lower coal seam of the coal group by drilling the water-bearing stratum, the safety production is ensured, and the method is a difficult problem in front of field engineering science and technology personnel.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can pass rock stratum and measure gas pressure's gas pressure measurement device and gas pressure measurement system.
The technical scheme of the utility model provides a gas pressure measuring device, which comprises a sleeve, a pressure measuring pipe and a drain pipe;
the sleeve is internally provided with a separation flange which separates the sleeve into an upper filling chamber and a lower air chamber;
the lower end of the pressure measuring pipe penetrates through the separating flange and is positioned in the lower air chamber, the upper end of the pressure measuring pipe is positioned above the upper filling chamber, and the upper end of the pressure measuring pipe is connected with a pressure measuring meter;
the lower end of the drain pipe penetrates through the separation flange and is inserted into the lower air chamber, and the upper end of the drain pipe is positioned above the upper filling chamber;
the upper filling chamber is filled with a filling body.
Further, the lower end of the drain pipe is located at the bottom of the lower air chamber.
Further, the lower end of the pressure measuring pipe is located at the top of the lower air chamber.
Further, the filling body is a concrete filling body.
Further, an isolation pocket is disposed above the separation flange.
Further, the isolation bag comprises a cloth bag and filler filled in the cloth bag.
Further, a drain pump is installed on the drain pipe.
Furthermore, control valves are respectively arranged on the water discharge pipe and the piezometric pipe.
Further, a plurality of air chamber openings are provided in the sleeve in communication with the lower air chamber.
The technical scheme of the utility model also provides a gas pressure measurement system, including the rock stratum, pass the drilling of rock stratum and the gas pressure measuring device of any preceding technical scheme;
the formation includes an upper aquifer and a lower coal seam, the casing of the gas pressure measurement device passes through the borehole, the upper fill chamber is located above the upper aquifer, and the lower gas chamber is located at least partially below the lower coal seam.
By adopting the technical scheme, the method has the following beneficial effects:
the utility model provides a gas pressure measurement device and gas pressure measurement system can pass the stratum or the aquifer above that with the sleeve pipe, discharges the water in the lower part air chamber as far as possible through the drain pipe, fills the thick liquid formation obturator to the upper portion filling chamber through grouting pump and slip casting pipe, and the manometer of rethread pressure-measuring pipe and top measures the pressure of the indoor gas of lower part.
The utility model provides a gas pressure measurement device and gas pressure measurement system can the accurate measurement measure coal seam gas pressure value, has especially solved the coal seam gas pressure measurement's when meeting the aquifer difficult problem of drilling downwards to wearing the layer.
The utility model provides a gas pressure measurement device and gas pressure measurement system, its construction material is ordinary, easily acquire, and construction process is simple and easy, and construction cost is low, and the degree of accuracy is high.
Drawings
Fig. 1 is a schematic view of a gas pressure measuring device according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the upper fill chamber of the gas pressure measurement device of FIG. 1 when not yet filled;
FIG. 3 is a schematic view of a drain pump mounted on a drain pipe;
FIG. 4 is a schematic view of an isolation flange and an isolation bladder;
fig. 5 is a schematic view of a gas pressure measuring system according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a borehole being disposed in a rock formation.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-2, an embodiment of the present invention provides a gas pressure measuring device, which includes a casing 1, a pressure measuring tube 3 and a drainage tube 4.
The sleeve 1 has a dividing flange 13 therein, the dividing flange 13 dividing the sleeve 1 into an upper filling chamber 11 and a lower air chamber 12.
The lower end of the pressure measuring pipe 3 penetrates through the separating flange 13 and is positioned in the lower air chamber 12, the upper end of the pressure measuring pipe 3 is positioned above the upper filling chamber 11, and the upper end of the pressure measuring pipe 3 is connected with a pressure measuring meter 6.
The lower end of the drain pipe 4 is inserted into the lower air chamber 12 through the partition flange 13, the upper end of the drain pipe 4 is positioned above the upper filling chamber 11, and the upper filling chamber 11 is filled with the filler 14.
The utility model provides a gas pressure measurement device mainly used colliery is gas pressure measurement in the pit can comprise sleeve pipe 1, slip casting pipe 2, pressure-measuring pipe 3, drain pipe 4 and grouting pump 5.
The sleeve 1 has an upper filling chamber 11 and a lower air chamber 12 therein, the upper filling chamber 11 and the lower air chamber 12 being separated by a separation flange 13 in the sleeve 1.
The lower plenum 12 is used to collect gas emanating from the coal seam. The upper filling chamber 11 is finally filled with a filling body, such as sand or concrete, to prevent the upper cement mortar and the like from flowing into the lower air chamber 12.
In order to fill the above-mentioned filler 14 in the upper filling chamber 11, a detachable grouting pipe 2 may be disposed in the upper filling chamber 11, and a grouting pump 5 may be disposed outside the casing 1.
The lower end of the grouting pipe 2 is inserted into the upper filling chamber 11, and the upper end of the grouting pipe 2 is connected to the grouting pump 5 located outside the sleeve 1.
Grouting can be performed into the upper filling chamber 11 by starting the grouting pump 1, the grouting pipe 2 is continuously lifted along with the rise of the mortar liquid level in the grouting process, and grouting is stopped until the upper opening of the upper filling chamber 11 is formed. Standing for 36-48 hours until cement mortar is solidified, and forming a filling body 14 in the upper filling chamber 11.
Both the pressure measuring tube 3 and the drain tube 4 are supported by a separating flange 13. The lower end of the pressure measuring pipe 3 is inserted into the lower air chamber 12 after passing through the partition flange 13 from the upper filling chamber 11, and the gas in the lower air chamber 12 can flow through the pressure measuring pipe 3. The upper end of the pressure measuring pipe 3 is positioned at the top of the upper filling chamber 11, and the upper end of the pressure measuring pipe 3 is connected with a pressure measuring meter 6 for measuring the gas pressure in the lower air chamber 12.
The lower end of the drain pipe 4 is inserted into the lower air chamber 12 after passing through the partition flange 13 from the upper filling chamber 11, and is used for draining the water in the lower air chamber 12 as much as possible.
Both the upper and lower ends of the casing 1 are provided with through pipe openings.
Therefore, the utility model provides a gas pressure measurement device can pass the stratum or the aquifer above that with sleeve pipe 1, discharge the water in lower part air chamber 12 through drain pipe 4 as far as possible, fill the thick liquid to upper portion filling chamber 11 through grouting pump 5 and slip casting pipe 2 and form obturator 14, the manometer 6 of rethread piezometer pipe 3 and its top measures the pressure of gas in lower part air chamber 12, it can accurately measure the coal seam gas pressure value, especially has solved down to the drilling of wearing the layer and has met the difficult problem of coal seam gas pressure measurement when the aquifer.
Preferably, as shown in FIG. 1, the lower end 41 of the drain pipe 4 is located at the bottom of the lower air chamber 12 to facilitate draining of water from the bottom of the lower air chamber 12. The water in the lower air chamber 12 can be sucked into the drain pipe 4 by the drain pump and then discharged through the drain pipe 4; the water in the lower air chamber 12 can be pressed into the water discharge pipe 4 by the pressure fan through the air pressure, and then discharged through the water discharge pipe 4.
Preferably, as shown in FIG. 1, the lower end 31 of the pressure measuring tube 3 is located at the top of the lower air chamber 12. Because the gas density is small, the gas can float above the lower air chamber 12, and the lower end 31 of the pressure measuring pipe 3 is arranged at the top of the lower air chamber 12, so that the gas can flow into the pressure measuring pipe 3 quickly, and the accurate pressure measurement is facilitated.
Preferably, the filling body 14 is a concrete filling body, and concrete grout or cement mortar is injected into the upper filling chamber 11 by the injection pump 5, and after the grout is solidified, the concrete filling body is formed to shield the lower air chamber 12 from above.
Preferably, as shown in fig. 1-4, an isolation bladder 15 is provided above the separation flange 13. The isolation bag 15 is used for reinforcing the pressure measuring pipe 3 and the drain pipe 4, and can also play a role in separating the lower air chamber 12 from the upper filling chamber 11 so as to prevent sand from entering the lower air chamber 12.
Preferably, as shown in fig. 4, the isolation pouch 15 includes a cloth bag 151 and a filler 152 filled in the cloth bag 151.
The filler 152 may be cement, such as dry cement. The filler 152 may also be an elastomeric filler, such as a veil.
If the filler 152 is filled with cement, the diameter of the cloth bag 151 should be slightly smaller than that of the casing 1; if the filler 152 is an elastic filler, the diameter of the cloth bag 151 should be slightly larger than that of the sleeve 1, so as to ensure that the isolating bag 15 can be smoothly placed into the predetermined position of the sleeve 1 under the effect of good isolation.
Preferably, as shown in fig. 3, a drain pump 9 is installed on the drain pipe 4 for draining the water in the lower air chamber 12.
Preferably, as shown in fig. 1, control valves 7 are respectively disposed on the drain pipe 4 and the pressure measuring pipe 3 for controlling the opening and closing of the drain pipe 4 and the pressure measuring pipe 3, so as to facilitate the operation.
Preferably, a plurality of chamber openings are provided on the casing 1 and communicate with the lower chamber 12, so that the gas in the coal seam can flow into the lower chamber 12 quickly, and the pressure of the gas in the lower chamber 12 can be measured by the pressure gauge 6.
As shown in fig. 5-6, an embodiment of the present invention further provides a gas pressure measuring system, including a rock formation 200, a borehole 203 penetrating the rock formation 200, and a gas pressure measuring device according to any of the previous embodiments.
The formation 200 includes an upper aquifer 201 and a lower coal seam 202, and the casing 1 in the gas pressure measurement device passes through a borehole 203. The upper filling chamber 11 is located above the upper aquifer 201 and the lower air chamber 12 is located at least partially below the lower coal seam 202.
The utility model provides a gas pressure measurement system mainly comprises rock stratum 200 and gas pressure measurement device.
For the structure, structure and operation principle of the gas pressure measuring device, please refer to the description part of the gas pressure measuring device, which is not repeated herein.
The formation 200 primarily includes an upper aquifer 201 and a lower coal seam 202, with a borehole 203 extending through the formation 200.
The casing 1 is passed through the borehole 203 with the upper filling chamber 11 located above the upper aquifer 201 and the lower air chamber 12 located at least partially below the lower coal seam 202, so that gas generated in the lower coal seam 202 enters the lower air chamber 12 to measure the pressure of the gas in the lower air chamber 12 by the pressure gauge 6.
The utility model provides a gas pressure measurement system's construction steps as follows:
1. drilling construction is carried out 3-5m below the bottom plate of the lower coal seam 202, the layer penetrating condition is recorded in the drilling 203 process, the installation scheme is determined according to the layer penetrating condition, the installation comprises an isolation bag 15, the positions of all orifices and the installation lengths of all sections, and after the drilling construction is finished, an underground air compression device can be used for being connected with a drill rod to blow out accumulated water in the drill hole 203.
2. According to the determined installation scheme, the sleeve 1 and the drain pipe 4 are sequentially installed in the drill hole 203.
3. After the water discharge pipe 4 is scheduled to reach the installation length, the pressure measuring pipes 3 are installed in parallel.
4. A separation flange 13 is mounted inside the sleeve 1.
5. An isolation pocket 15 is mounted on the partition flange 13.
6. The injection tube 2 is installed in the upper filling chamber 11 until the end of the injection tube 2 is above the isolation bladder 15. The grouting pipe 2 can be connected with an underground compressed air pipe, an air pipe valve is opened after connection is completed, the compressed air blows accumulated water in the upper filling chamber 11, and the isolation bag 5 is compacted in the step, so that the effect is enhanced.
7. And after the air returned from the upper filling chamber 11 does not carry a large amount of water mist any more, connecting the grouting pipe 2 with the grouting pump 5.
8. And starting the grouting pump 1 to perform grouting in the upper filling chamber 11, continuously lifting the grouting pipe 2 along with the rise of the liquid level of the mortar in the grouting process until the upper opening of the upper filling chamber 11 is formed, and stopping grouting.
9. Standing for 36-48 hours until cement mortar is solidified, and forming a filling body 14 in the upper filling chamber 11. And opening the control valve 7 of the water discharge pipe 4 to discharge accumulated water in the lower air chamber 12 until the water discharge pipe 4 does not discharge a large amount of water, and closing the control valve 7 on the water discharge pipe 4.
10. The control valve 7 of the pressure measuring pipe 3 is opened, and the pressure of the gas in the lower chamber 12 is measured by the pressure gauge 6.
According to the needs, the above technical schemes can be combined to achieve the best technical effect.
What has been described above is merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principle of the present invention, several other modifications can be made, and the protection scope of the present invention should be considered.

Claims (10)

1. The gas pressure measuring device is characterized by comprising a sleeve, a pressure measuring pipe and a drain pipe;
the sleeve is internally provided with a separation flange which separates the sleeve into an upper filling chamber and a lower air chamber;
the lower end of the pressure measuring pipe penetrates through the separating flange and is positioned in the lower air chamber, the upper end of the pressure measuring pipe is positioned above the upper filling chamber, and the upper end of the pressure measuring pipe is connected with a pressure measuring meter;
the lower end of the drain pipe penetrates through the separation flange and is inserted into the lower air chamber, and the upper end of the drain pipe is positioned above the upper filling chamber;
the upper filling chamber is filled with a filling body.
2. The gas pressure measuring device of claim 1, wherein a lower end of the drain pipe is located at a bottom of the lower plenum.
3. The gas pressure measurement device of claim 1, wherein a lower end of the pressure measuring tube is located at a top of the lower plenum.
4. The gas pressure measurement device of claim 1, wherein the filler body is a concrete filler body.
5. The gas pressure measurement device of claim 1, wherein an isolation bladder is disposed above the separation flange.
6. The gas pressure measuring device according to claim 5, wherein the isolating pocket includes a cloth bag and a filler filled in the cloth bag.
7. The gas pressure measuring device of claim 1, wherein a drain pump is mounted on the drain pipe.
8. The gas pressure measuring device according to claim 1, wherein a control valve is provided on each of the drain pipe and the pressure measuring pipe.
9. The gas pressure measurement device of claim 1 wherein a plurality of plenum openings are provided in said sleeve in communication with said lower plenum.
10. A gas pressure measuring system comprising a rock formation, a borehole penetrating the rock formation, and the gas pressure measuring device of any one of claims 1-9;
the formation includes an upper aquifer and a lower coal seam, the casing of the gas pressure measurement device passes through the borehole, the upper fill chamber is located above the upper aquifer, and the lower gas chamber is located at least partially below the lower coal seam.
CN201921729397.2U 2019-10-15 2019-10-15 Gas pressure measuring device and gas pressure measuring system Active CN210714675U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921729397.2U CN210714675U (en) 2019-10-15 2019-10-15 Gas pressure measuring device and gas pressure measuring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921729397.2U CN210714675U (en) 2019-10-15 2019-10-15 Gas pressure measuring device and gas pressure measuring system

Publications (1)

Publication Number Publication Date
CN210714675U true CN210714675U (en) 2020-06-09

Family

ID=70935900

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921729397.2U Active CN210714675U (en) 2019-10-15 2019-10-15 Gas pressure measuring device and gas pressure measuring system

Country Status (1)

Country Link
CN (1) CN210714675U (en)

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