CN220454805U - General type drilling rock mass gas tightness detects test device - Google Patents
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- 238000012669 compression test Methods 0.000 description 8
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- 238000005086 pumping Methods 0.000 description 5
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Abstract
The utility model provides a universal drilling rock mass air tightness detection test device, which comprises a detection control part and a data acquisition system, wherein the detection control part is used for detecting the air tightness of a drilling rock mass; one end of the detection control part is provided with an air flow reversing device communicated with the inside of the detection control part, the air flow reversing device is communicated with a high-pressure air inlet pipe and a high-pressure air outlet pipe which can be closed, and the tail end of the high-pressure air inlet pipe is connected with a high-pressure pump station; the high-pressure air outlet pipe and the high-pressure air inlet pipe are respectively provided with a first barometer and a second barometer, and the first barometer and the second barometer are electrically connected with the data acquisition system; the detection and control part is provided with a packer, and the middle part of the packer is provided with a vent pipe which is communicated with the inside of the packer. The method can realize the gas tightness detection of the drilling rock mass, improve the accuracy of gas tightness evaluation of the rock mass, and provide reference and basis for gas tightness evaluation of surrounding rocks of the underground gas storage.
Description
Technical Field
The utility model relates to the technical field of air tightness detection of surrounding rocks of underground gas reservoirs, in particular to a universal drilling rock mass air tightness detection test device.
Background
Compressed Air Energy Storage (CAES) refers to an energy storage mode in which electric energy is used for compressed air in a grid load low-peak period, the air is sealed in a gas storage under high pressure, and the compressed air is released to push a steam turbine to generate power in a grid load peak period. The gas storage is an important component of the compressed gas energy storage power station and can be divided into salt caves, modified ore caverns, artificial chambers, artificial gas storage tanks/pipelines and the like, wherein the salt caverns, the modified ore caverns and the artificial chambers have higher requirements on the air tightness of underground rock mass. The application of the gas storage tightness detection technology in China is still in a fumbling stage, and the current method is mostly aimed at detecting the tightness of the salt cavern gas storage, is time-consuming and labor-consuming, and lacks a general gas tightness detection and evaluation method aiming at underground rock mass, and particularly carries out rock mass gas tightness detection and evaluation through drilling. Therefore, research on a rock mass air tightness detection test device is particularly necessary to solve the problems.
At present, the air tightness of a drilling rock mass is mostly obtained by a pressurized water test, so that the air tightness of the rock mass is estimated, but a certain error and a certain problem are unavoidable in the evaluation of the air tightness of the rock mass by the method. Therefore, it is required to develop a drill hole airtightness detection test apparatus specifically for the airtightness of a rock mass.
Disclosure of Invention
The utility model aims to provide a test device for detecting the air tightness of a drilling rock mass so as to improve the accuracy of judging the air tightness of the rock mass.
For this purpose, the utility model adopts the following technical scheme:
the utility model provides a general drilling rock mass gas tightness detects test device, the test device includes detection and control part, and data acquisition system; one end of the detection control part is provided with an air flow reversing device communicated with the inside of the detection control part, the air flow reversing device is communicated with a high-pressure air inlet pipe and a high-pressure air outlet pipe which can be closed, and the tail end of the high-pressure air inlet pipe is connected with a high-pressure pump station; the high-pressure air outlet pipe and the high-pressure air inlet pipe are respectively provided with a first barometer and a second barometer, and the first barometer and the second barometer are electrically connected with the data acquisition system; the detection and control part is provided with a packer, and the middle part of the packer is provided with a vent pipe which is communicated with the inside of the packer; simultaneously, arranging air bags on the packers so as to form a compressed air type test section between the packers; and holes are formed in the pipe wall of the vent pipe.
Further: the test device further comprises a control system, wherein the control system is electrically connected with the high-pressure pump station and the data acquisition system; and the control system is also electrically connected with the airflow reversing device to form a communication state or a closing state of an internal passage of the airflow reversing device.
Further: the air flow reversing device comprises two passages, wherein the first passage is communicated with the air bag, and the second passage is communicated with the vent pipe.
Further: the cross-sectional area of the packer is larger than or equal to the cross-sectional area of the vent pipe.
Further: the high-pressure air outlet pipe is provided with a pressure relief valve at the downstream of the first barometer, and the high-pressure air inlet pipe is provided with a pressure regulating valve at the upstream of the second barometer.
Further: a flow rate sensor is arranged between the second barometer and the pressure regulating valve.
Further: the gas outlet of the high-pressure pump station is provided with a third barometer and a pressure control valve, and the pressure control valve and the third barometer are sequentially arranged along the gas outflow direction.
Further: the test device is characterized in that a fixed rack is arranged outside the geological drilling hole, and a pipeline interface matched with the high-pressure gas outlet pipe and the high-pressure gas inlet pipe wall is arranged in the fixed rack.
Compared with the prior art, the utility model has the following beneficial effects:
the device for detecting the air tightness of the drilling rock mass can realize the air tightness detection of the drilling rock mass, improve the accuracy of evaluating the air tightness of the rock mass and provide reference and basis for evaluating the air tightness of surrounding rocks of an underground gas storage.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
fig. 2 is a schematic structural diagram of the inside of the airflow reversing device.
The marks in the drawings are: 1-geological drilling; 2-stopping gas embolism; 3-a vent pipe; 4-inflating an airbag; 5-an airflow reversing device; 6-high pressure air inlet pipe; 7-a high pressure vent; 8-a fixed rack; 9-pipeline connectors; 10-a first barometer; 11-a pressure relief valve; 12-a second barometer; 13-a flow rate sensor; 14-a pressure regulating valve; 15-a third barometer; 16-a pressure control valve; 17-a high-pressure air pump; 18-a high pressure pump station; 19-a data acquisition system; 20-control system.
Detailed Description
The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.
As shown in fig. 1-2, a general type drilling rock mass air tightness detection test device comprises a detection control part and a data acquisition system 19; one end of the detection control part is provided with an air flow reversing device 5 communicated with the inside of the detection control part, the air flow reversing device 5 is communicated with a high-pressure air inlet pipe 6 and a high-pressure air outlet pipe 7 which can be closed, and the tail end of the high-pressure air inlet pipe 6 is connected with a high-pressure pump station 18; the high-pressure air outlet pipe 7 and the high-pressure air inlet pipe 6 are respectively provided with a first barometer 10 and a second barometer 12, and the first barometer 10 and the second barometer 12 are electrically connected with a data acquisition system 19; a packer is arranged on the detection and control part, and a breather pipe 3 is arranged in the middle of the packer to communicate the inside of the packer; simultaneously, an air bag 4 is arranged on the packers, so that a compressed air type test section is formed between the packers; and holes are arranged on the pipe wall of the vent pipe 3.
In the embodiment, when the test device detects the air tightness of the geological drilling hole 1, only the detection and control part stretches into the geological drilling hole 1, and meanwhile, in the embodiment, the packer adopts the cylindrical air stop plugs 2, the number of the cylindrical air stop plugs is optimally divided into an upper part and a lower part, the air stop plugs 2 at the two ends are connected through the vent pipe 3 and a certain sealing section length is reserved, the sealing section length can be regulated or controlled by the vent pipe 3, and the sealing section is an air compression test section; a circle of air bag groove is arranged in the cylindrical side surface of the air stop plug 2, an air bag 4 is loaded in the air bag groove, the air stop plug 2 can be tightly attached to the wall of the geological drilling hole 1 after the air bag 4 is inflated, and the air tightness of a sealing section of an air compression test is ensured.
As shown in figure 1, the holes on the pipe wall of the ventilation pipe 3 can be matched with and are convenient for pumping and inflating the sealing section during the air compression test.
As shown in fig. 1, in particular, the test device further includes a control system 20, where the control system 20 is electrically connected to the high-pressure pump station 18 and the data acquisition system 19; meanwhile, the control system 20 is also electrically connected with the airflow reversing device 5 to form a communication state or a closing state of the internal passage of the airflow reversing device 5.
In this embodiment, the control system 20 includes a programmable controller, and the control system 20 is respectively connected to and interrelated with the high-pressure pump station 18, the data acquisition system 19, and the air flow reversing device 5 through connection lines, so that the control system 20 can control the whole air compression test flow. While the data acquisition system 19 is in communication with the first barometer 10, the second barometer 12, the third barometer 15 and the flow sensor 13, respectively, via connection lines.
1-2, wherein the air flow reversing device 5 internally comprises two passages, and the first passage is communicated with the air bag 4 and is used for pumping and deflating the air bag 4; the second passage is communicated with the vent pipe 3 and is used for pumping water and inflating and deflating the sealing section of the air compression test.
Wherein the cross-sectional area of the packer is larger than or equal to the cross-sectional area of the breather pipe 3. So as to realize the airtight detection of the sealing section of the air compression test.
As shown in fig. 1, the packer, the breather pipe 3 and the airflow reversing device 5 are sequentially connected from bottom to top and coaxially arranged, and the three are hollow to form an internal passage capable of sequentially flowing.
As shown in fig. 1, specifically, the high-pressure gas outlet pipe 7 is provided with a relief valve 11 downstream of the first barometer 10, and the high-pressure gas inlet pipe 6 is provided with a pressure regulating valve 14 upstream of the second barometer 12.
Wherein a flow rate sensor 13 is arranged between the second barometer 12 and the pressure regulating valve 14.
The intake pressure, the intake flow rate, and the adjustment of the intake pressure can be accurately known by the second barometer 12, the pressure regulating valve 14, and the flow rate sensor 13. The internal air pressure can be released by the pressure release valve 11.
As shown in fig. 1, specifically, the high-pressure pump station 18 includes a high-pressure air pump 17, a third barometer 15, and a pressure control valve 16, the third barometer 15 and the pressure control valve 16 are disposed at a gas outlet position of the high-pressure air pump 17, and the pressure control valve 16 and the third barometer 15 are disposed in this order in a gas outflow direction. The pumping pressure of the high-pressure air pump 17 can be precisely known and adjusted by the third barometer 15 and the pressure control valve 16.
As shown in fig. 1, this embodiment also provides a detection fixing structure, which fixes the portions of the high-pressure gas inlet pipe 6 and the high-pressure gas outlet pipe 7 extending to the outside of the geological drilling hole 1, and further ensures the stability of the test device in the geological drilling hole 1.
Specifically, the detection fixing structure comprises a fixing rack 8 arranged outside the geological drilling hole 1, and a pipeline interface 9 matched with the high-pressure gas outlet pipe 7 and the high-pressure gas inlet pipe 6 is arranged in the fixing rack 8.
Referring to fig. 1-2, in the test of the detection device for the air tightness of the drilling rock mass, the specific operation mode is as follows:
firstly, in a test site area, geological drilling is constructed according to standard requirements, after the construction is completed and the drilling cleaning work is finished, a gas stop plug 2, a vent pipe 3 and a gas flow reversing device 5 of a test device are sequentially connected from bottom to top and coaxially arranged, and the gas stop plug, the vent pipe 3 and the gas flow reversing device are placed into a preset test depth section in a drilling hole 1, wherein the upper end of the gas flow reversing device 5 is respectively connected with a high-pressure gas inlet pipe 6 and a high-pressure gas outlet pipe 7. The high-pressure air inlet pipe 6 and the high-pressure air outlet pipe 7 are respectively connected with a pipeline connector 9 at the drill hole and are fixed on a fixed bench 8.
The end relief valve 11 of the high-pressure outlet pipe 7 is kept in an open state.
The pressure regulating valve 14 at the outer section of the high-pressure air inlet pipe 6 and the pressure control valve 16 of the high-pressure pump station 18 are both kept in an open state.
Before the compression test starts, whether the connection between the parts of the instrument is tight or not needs to be checked, so that the tightness of test equipment is ensured.
The high-pressure air compression test needs to seal a test section by the double air stop plugs 2 of the packer, the air flow reversing device 5 is regulated by the control system 20, the high-pressure air inlet pipe 6 is communicated with the inflatable air bag 4, the high-pressure air pump 17 is opened positively to enable the air bag 4 to be tightly attached to the wall of a drilling hole after being inflated, and the tightness of the test section is ensured.
The control system 20 adjusts the air flow reversing device 5 to enable the high-pressure air inlet pipe 6 to be communicated with the air pipe 3, and the water in the test section is completely pumped out through the reverse operation of the high-pressure air pump 18.
After waiting for the water to be completely discharged from the test section, the relief valve 11 and the pressure regulating valve 14 are closed.
The high-pressure air pump 17 is opened again in the forward direction, the pumping pressure is regulated to the test pressure, after the third barometer 15 indicates that the test pressure is reached and kept stable, the pressure regulating valve 14 is opened, the air is inflated into the test section, the air pressure in the test section is waited to reach the test pressure, after the second barometer 12 indicates that the test pressure is the same as the test pressure and kept stable (the first barometer 10 indicates that the reference and the second barometer 12 can be mutually verified), the pressure regulating valve 14 is closed firstly, and then the high-pressure pump station 18 is closed. At this point, the first barometer 10 and the second barometer 12 readings are recorded and the timer is started.
The whole test system was kept balanced for 60min and the changes in the readings of the first barometer 10 and the second barometer 12 were recorded, both being the test section barometric pressure.
And then, according to the recorded data, calculating the gas leakage rate of the rock mass, and evaluating the gas tightness of the rock mass.
For the gas in the test section, there is an ideal gas state equation (1):
pV＝nRT
wherein p is gas pressure, unit MPa; v is the volume of the test section, and the unit is L; n is the amount of the substance of the gas, in mol; r is the molar gas constant, r=8.31J/(mol·k); t is the gas temperature, in K.
So the amount of the leaked gas isUnits mol.
Gas leakage rate (2) of rock mass:
wherein q is the gas leakage rate of the rock mass, and is equal to the gas volume lost per minute in the length of each test section under the test pressure of 1MPa, and the unit is L/m.MPa.min; vm is the molar volume of the gas under standard conditions, vm=22.4L/mol; l is the length of the test section, and the unit is m; p is the test pressure in MPa.
And (3) bringing the ideal gas state equation into a rock mass gas leakage rate calculation equation to obtain the following (3):
the gas leakage rate of the drilled rock mass can be calculated through the formula (3), so that the gas tightness of the rock mass can be judged and evaluated.
The above embodiment is only one preferred technical solution of the present utility model, and it should be understood by those skilled in the art that modifications and substitutions can be made to the technical solution or parameters in the embodiment without departing from the principle and essence of the present utility model, and all the modifications and substitutions are covered in the protection scope of the present utility model.
Claims (8)
1. A general drilling rock mass gas tightness detects test device, its characterized in that: the test device comprises a detection control part and a data acquisition system (19); one end of the detection control part is provided with an air flow reversing device (5) communicated with the inside of the detection control part, the air flow reversing device (5) is communicated with a high-pressure air inlet pipe (6) and a high-pressure air outlet pipe (7) which can be closed, and the tail end of the high-pressure air inlet pipe (6) is connected with a high-pressure pump station (18); a first barometer (10) and a second barometer (12) are respectively arranged on the high-pressure air outlet pipe (7) and the high-pressure air inlet pipe (6), and the first barometer (10) and the second barometer (12) are electrically connected with the data acquisition system (19);
the detection and control part is provided with a packer, and the middle part of the packer is provided with a vent pipe (3) for communicating the inside of the packer; simultaneously, arranging air bags (4) on the packers, so that a compressed air type test section is formed between the packers; and holes are formed in the pipe wall of the ventilation pipe (3).
2. The universal borehole rock mass air tightness detection test device as recited in claim 1, wherein: the test device further comprises a control system (20), wherein the control system (20) is electrically connected with the high-pressure pump station (18) and the data acquisition system (19);
and the control system (20) is also electrically connected with the airflow reversing device (5) to form a communication state or a closing state of an internal passage of the airflow reversing device (5).
3. The universal borehole rock mass air tightness detection test device as recited in claim 1, wherein: the air flow reversing device (5) comprises two passages, wherein the first passage is communicated with the air bag (4), and the second passage is communicated with the vent pipe (3).
4. The universal borehole rock mass air tightness detection test device as recited in claim 1, wherein: the cross-sectional area of the packer is larger than or equal to the cross-sectional area of the vent pipe (3).
5. The universal borehole rock mass air tightness detection test device as recited in claim 1, wherein: the high-pressure air outlet pipe (7) is provided with a pressure relief valve (11) at the downstream of the first barometer (10), and the high-pressure air inlet pipe (6) is provided with a pressure regulating valve (14) at the upstream of the second barometer (12).
6. The universal drilling rock mass air tightness detection test device according to claim 5, wherein: a flow rate sensor (13) is arranged between the second barometer (12) and the pressure regulating valve (14).
7. The universal borehole rock mass air tightness detection test device as recited in claim 1, wherein: a third barometer (15) and a pressure control valve (16) are arranged at the gas outlet position of the high-pressure pump station (18), and the pressure control valve (16) and the third barometer (15) are sequentially arranged along the gas outflow direction.
8. The universal borehole rock mass air tightness detection test device as recited in claim 1, wherein: the test device is characterized in that a fixed rack (8) is arranged outside the geological drilling hole (1), and a pipeline interface (9) matched with the high-pressure air outlet pipe (7) and the pipe wall of the high-pressure air inlet pipe (6) is arranged in the fixed rack (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321572304.6U CN220454805U (en) | 2023-06-19 | 2023-06-19 | General type drilling rock mass gas tightness detects test device |
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| CN202321572304.6U CN220454805U (en) | 2023-06-19 | 2023-06-19 | General type drilling rock mass gas tightness detects test device |
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