CN106198117B - The in-site detecting device and measuring method of gas parameter - Google Patents
The in-site detecting device and measuring method of gas parameter Download PDFInfo
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- CN106198117B CN106198117B CN201510270108.7A CN201510270108A CN106198117B CN 106198117 B CN106198117 B CN 106198117B CN 201510270108 A CN201510270108 A CN 201510270108A CN 106198117 B CN106198117 B CN 106198117B
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- 238000011065 in-situ storage Methods 0.000 claims abstract description 34
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 54
- 229910002092 carbon dioxide Inorganic materials 0.000 description 27
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
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Abstract
The in-site detecting device and measuring method of a kind of gas parameter are disclosed.Measurement device includes: detection pipe, it is arranged in the measurement well of predetermined depth, the opening for detecting bottom of the tube is contacted with measurement well shaft bottom soil layer, and there is the first sealing partition, the tube wall of detection pipe and the first sealing partition and shaft bottom soil layer to form collection chamber for adjacent openings position in detection pipe；And gas parameter analyzer, it is arranged in detection pipe, the special parameter of under test gas in situ detection collection chamber.
Description
Technical Field
The invention relates to the field of detection, in particular to an in-situ gas parameter measuring device and a measuring method.
Background
Currently, methods available for measuring gas flux (e.g., carbon dioxide) include primarily box methods, microclimate methods, ultralarge box long path infrared chromatography, and isotope methods. Among them, the microclimate method and the box method are most commonly used. The box method is further classified into a static box method and a dynamic box method, wherein the static box method is one of the most commonly applied methods.
The static box method is a simpler flux measurement method, and the box body is made of a chemically stable material, so that the volume and the bottom area have accurate values. The bottom surface of the box is provided with an opening, the upper surface of the box is provided with a cover, and the cover can be flexibly opened and closed. During measurement, the tested ground mask is covered by the box, the concentration of the gas to be tested in the box is measured for 1 time at intervals under the condition that no exchange between the air in the box and the outside exists, and then the discharge flux of the gas on the surface of the tested ground mask can be obtained by utilizing the function relation according to the change of the concentration of the gas to be tested along with the time.
However, the above method can only detect the flux of carbon dioxide in the earth surface soil, and cannot detect the flux of carbon dioxide in the geological cover or at any stratum depth.
In view of the above technical problems, no good solution is available in the prior art.
Disclosure of Invention
The invention aims to provide a device and a method, by which whether gas in a geological cover leaks upwards or not can be detected, for example, under the condition of gas burial storage.
In order to achieve the above object, the present invention provides an in-situ measurement apparatus for a gas parameter, comprising: the detection pipe is arranged in a measuring well with a preset depth, an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a first sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and a gas collection chamber is formed by the pipe wall of the detection pipe, the first sealing partition plate and the bottom soil layer; and a gas parameter analyzer arranged in the detection pipe and configured to detect specific parameters of the gas to be detected in the gas collecting chamber in situ.
Further, the measuring apparatus further comprises: a temperature and humidity sensor arranged on the first sealing partition plate and configured to detect the temperature and humidity in the gas collection chamber; and a pressure sensor disposed on the first sealing diaphragm and configured to detect a pressure in the plenum.
Further, the measuring apparatus further comprises: a circulating pipeline which is provided with an inlet and an outlet communicated with the gas collecting chamber; and the dehumidifier is configured to dehumidify and dry the gas flowing through the dehumidifier, and the dehumidifier and the gas parameter analyzer are sequentially connected in series from an inlet to an outlet in the circulating pipeline.
Further, the measuring apparatus further comprises: an air pump disposed in the circulation line between the dehumidifier and the gas parameter analyzer, configured to draw air in the plenum and send the drawn air to the gas parameter analyzer.
Further, the measuring apparatus further comprises: and the electromagnetic valve is arranged in the circulating pipeline and is configured to be opened to release air when at least one of the pressure, the temperature and the humidity detected by the pressure sensor and the temperature and humidity sensor exceeds a preset threshold value, and to be closed when the pressure, the temperature and the humidity detected by the pressure sensor and the temperature and humidity sensor are constant after air release.
Furthermore, a second sealing partition plate is further arranged on one side, away from the opening, of the first sealing partition plate in the detection pipe, a closed space is defined by the second sealing partition plate, the first sealing partition plate and the inner wall of the detection pipe, and the temperature and humidity sensor, the pressure sensor, the gas concentration analyzer and the dehumidifier are located in the closed space.
Further, the measuring device also comprises a ventilation pipe penetrating through the second sealing partition plate and used for communicating the closed space with the ground environment for ventilation.
Further, the assay device further comprises: a submersible pump and a water accumulation detector disposed in the plenum, the water accumulation detector configured to detect a level of accumulated water in the plenum, the submersible pump configured to open to drain accumulated water out of the plenum when the level of accumulated water in the plenum reaches a predetermined height.
Further, a gas collection partition plate is arranged at an opening at the bottom of the detection tube, and the gas collection partition plate is provided with a plurality of holes for gas to pass through so as to enter the gas collection chamber.
Further, the measuring device also comprises a ground sampling air suction pipe which is communicated with the circulating pipeline through an electromagnetic valve so as to send the gas to be measured to the ground.
In another aspect of the present invention, there is provided an in situ method for measuring a gas parameter, the method comprising: excavating a measuring well with a preset depth; arranging a detection pipe in the measuring well to form a gas collection chamber at the bottom of the measuring well, wherein an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and the pipe wall of the detection pipe, the sealing partition plate and the bottom soil layer form the gas collection chamber; and detecting specific parameter data of the gas to be detected in the gas collecting chamber in situ.
Further, the measurement method further includes: and detecting the temperature, humidity and pressure of the gas in the gas collecting chamber in situ.
Further, the measurement method further includes: before detecting the temperature, the pressure and specific parameter data of the gas to be detected in the gas collection chamber in situ, dehumidifying and drying the gas in the gas collection chamber.
Further, the measurement method further includes: releasing gas in the plenum when at least one of the detected pressure, temperature, and humidity exceeds a predetermined threshold; and stopping releasing when the pressure, the temperature and the humidity of the gas in the gas collection chamber are constant after releasing, and then continuously detecting the temperature, the pressure and specific parameter data of the gas to be detected in the gas collection chamber in situ.
Further, the measurement method further includes: detecting specific parameter data of the gas to be detected in the gas collection chamber on the ground and underground in situ respectively; and comparing the detection data of the ground and the underground in-situ for verification.
Through the technical scheme, the parameter of the gas to be detected can be detected in situ, and the phenomenon that the parameter of the gas is changed and/or lagged due to the influence of the transmission distance and the environment before the gas is detected is avoided.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an exemplary configuration of an in situ gas flux measurement device according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method for in situ determination of gas flux according to an embodiment of the present invention; and
fig. 3 is a schematic diagram of an exemplary configuration of an in situ gas flux measurement device according to another embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
According to one embodiment of the present invention, there is provided an in situ measurement device for a gas parameter, the measurement device comprising: the detection pipe is arranged in a measuring well with a preset depth, an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a first sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and a gas collection chamber is formed by the pipe wall of the detection pipe, the first sealing partition plate and the bottom soil layer; and a gas parameter analyzer arranged in the detection pipe and configured to detect specific parameters of the gas to be detected in the gas collecting chamber in situ.
The specific parameter of the gas to be measured may include various data that can be detected or analyzed by a common instrument, such as concentration, density, flow rate, etc., and as will be understood by those skilled in the art, other data of the gas that cannot be directly measured, such as flux of the gas, may be further calculated according to the specific parameter detected and combined with other data, such as pressure, temperature, time, etc. In this context, the gas parameters include specific parameters that can be directly detected by an instrument and parameters that need to be calculated in combination with two or more specific parameters.
The following describes how to measure the flux of the gas to be measured by using a gas concentration analyzer as an example, as shown in fig. 1. FIG. 1 is a schematic diagram of an in-situ gas flux measurement device according to an embodiment of the present invention. As shown in fig. 1, the apparatus for in-situ measurement of gas flux provided by the present invention may include: the detection tube 1 is configured to be arranged in a measuring well with a preset depth, an opening at the bottom of the detection tube 1 is in contact with a bottom soil layer of the measuring well, a first sealing partition plate 2 is arranged in the detection tube 1 at a position adjacent to the opening, and a tube wall of the detection tube 1, the first sealing partition plate 2 and the bottom soil layer form a gas collection chamber; a temperature and humidity sensor 3 arranged on the first sealing partition plate 2 and configured to detect the temperature and humidity in the gas collection chamber; a pressure sensor 4 disposed on the first sealing partition 2 and configured to detect a pressure in the plenum; a circulation pipeline 5, wherein the circulation pipeline 5 is provided with an inlet and an outlet which are communicated with the gas collecting chamber; and a gas concentration analyzer 6 (e.g., a carbon dioxide concentration analyzer) disposed in the detection pipe 1 in series with the circulation line 5, configured to detect in-situ a concentration of a gas to be measured (e.g., carbon dioxide) in the circulation line 5.
The term "in-situ detection" as used herein refers to directly measuring or analyzing gas at a gas collection point, rather than sending the collected gas back to the ground, so as to avoid the gas being influenced by the environment during transportation and prevent the measurement or analysis result from not accurately reflecting the conditions of the collection point, and simultaneously obtain the measurement or analysis data in real time.
Through the technical scheme, the bottommost part of the detection tube is provided with the gas collection chamber which is a closed space with a certain volume formed by the sealing partition plates, the bottom of the detection tube is open, and the detection tube is directly buckled on a soil layer for measuring the depth to form a box body for measuring the concentration/flux. The gas state in the gas collecting chamber can be detected in real time by using different sensors, such as temperature, humidity and pressure detection probes. Through the concentration difference of two different times, the correction of auxiliary temperature, pressure, humidity, etc., under the condition that the volume of the gas collection chamber is fixed, the gas flux of the soil in unit time can be easily calculated. Take carbon dioxide as an example, where the concentration of carbon dioxide can be measured by a carbon dioxide concentration analyzer (e.g., an infrared carbon dioxide concentration analyzer). By derivation: the flux calculation formula is:
F＝0.0053(C2-C1)*P*H/(273+T)(t2-t1)
in the formula: the nominal height H is a fixed value and is the total height of the plenum after the volume of the pipeline is converted into the volume of the plenum, and the unit is meter. Flux F in mg/m2And/hr. P is the absolute pressure in Pa. C1、C2The carbon dioxide concentration is in PPM (mg/L) corresponding to different measurement times. T is the temperature in degrees Celsius. t is t1、t2In units of hr (hours) for various measurement times.
In the above embodiment, in order to obtain humidity data of the gas in the plenum chamber, preferably, the measuring device may further include a humidity sensor (for example, a temperature and humidity probe having both temperature and humidity detection) disposed on the sealed partition plate 2.
In the above embodiment, the gas in the plenum enters the circulation line 5 through the inlet of the circulation line 5, passes through the gas concentration analyzer 6, and then returns to the plenum from the outlet of the circulation line 5. In order to eliminate the influence of the gas humidity on the carbon dioxide concentration detection, a dehumidifier 7 (e.g., a membrane filter dehumidifier) may be provided at the near-inlet end of the circulation line 5 in an embodiment. The dehumidifier 7 can dehumidify and dry the gas flowing through the dehumidifier 7. The dehumidifier 7 may be connected in series with the gas concentration analyzer 6 in the circulation line 5 from the inlet to the outlet.
In embodiments, the gas circulation process may be slow and not conducive to data acquisition. Therefore, preferably, an air pump 8 (e.g., a plunger air pump) may be provided in the circulation line 5, and the air in the plenum is sucked by the air pump 8 and then sent to the gas concentration analyzer 6. In such an embodiment, an air pump 8 may be provided in the circulation line 5 between the dehumidifier 7 and the gas concentration analyzer 6, and the air pump 8 may pump the gas in the plenum and send the pumped gas to the gas concentration analyzer 6.
The use of the air pump 8 makes it possible to achieve a directed flow of air in the circulation line 5. The air in the air collection chamber is pumped out by the air pump 8, is sent into the air concentration analyzer 6 through the filter dehumidifier 7 to detect the air concentration, and then returns to the air collection chamber to form a closed cycle. Therefore, the concentration of the gas to be detected in the gas collection chamber can be known in real time.
In the detection process, the circulation of the closed gas circuit can lead to the increase of the gas temperature, and the closed gas collection can also lead to the increase of the pressure. In order to ensure the safety of equipment and the reliability of a detection result, the invention can realize accurate box method determination, simultaneously can sense the gas state in the gas collection chamber in real time by using the detection probes of temperature, pressure and humidity, and can release the suppressed gas in the gas collection chamber through the electromagnetic valve 9 arranged on the circulating pipeline 5 after a plurality of measurement periods are finished, thereby updating the gas in the gas collection chamber. Making repeated measurements possible.
In this embodiment, the measuring apparatus provided by the present invention may further include a solenoid valve 9 provided in the circulation line 5, and the solenoid valve 9 may be opened to deflate when the pressure detected by the pressure sensor 4 exceeds a predetermined threshold value, and closed when the pressure detected by the pressure sensor 4 returns to an initial state at the start of detection or is constant after deflation. The temperature, humidity and pressure in the plenum all can cause the influence to the normal work of survey device, and in the embodiment, solenoid valve 9 can open when pressure sensor 4 and the at least one in pressure, temperature and humidity that temperature and humidity sensor 3 detected exceeds predetermined threshold and close when the pressure, temperature and humidity that pressure sensor 4 and temperature and humidity sensor 3 detected after the gassing are invariable.
The opening and closing control of the electromagnetic valve 9 may be controlled by the pressure sensor 4, or the opening and closing of the electromagnetic valve 9 may be periodically controlled. Either control mode can exhaust the pressure accumulated in the gas collection chamber and renew the gas in the gas collection chamber so as to start a new measurement.
The principles of the present invention can be briefly described as follows (again taking the detection of carbon dioxide as an example). A gas detection pipe is arranged in a measuring well with a preset depth, the lowest part of the gas detection pipe directly contacts a well bottom soil layer (such as an underground soil layer with the depth of 200 meters from the ground), the bottom of the detection pipe is provided with an opening, a sealing partition plate is arranged at a proper position inside the detection pipe, a closed space can be formed between the sealing partition plate in the detection pipe and the soil to be used as a gas collection chamber, carbon dioxide escaping from the soil is collected, and the flux measurement of the underground box method is realized. An air pump can be arranged above the air collection chamber to suck air from the air collection chamber through a thin tube, the air is dried and then sent to an analyzer to be analyzed, and the analyzed air returns to the air collection chamber to form a circulating air path with a fixed volume. The analyzer can measure the concentration of carbon dioxide at any time according to the ideal gas state equation PV ═ nRT
Wherein,
p-pressure, unit pa
V-volume, unit m3
n-molar amount, unit kg/mol
R-gas constant, 8.31J/(mol. K)
T is the absolute temperature, in K,
i.e. the carbon dioxide flux over a fixed time can be calculated.
In an embodiment of the present invention, the data of each sensor (for example, a temperature/humidity measurement probe or a pressure measurement probe) and the data of the carbon dioxide concentration analyzer may be acquired by a data acquisition device (for example, a sampling circuit), for example. The acquired analog signals can be converted into digital signals through analog-to-digital conversion. The assay device may be configured with a controller or connected to an external controller or computer. The controller can be a hardware element with operation processing capability, such as a single chip microcomputer and an integrated circuit chip. The controller and/or computer may obtain data from the data acquisition device and operate on the data to effect the calculation of the carbon dioxide flux. In an embodiment, the controller and/or computer may suspend the determination when the pressure detected by the pressure measurement probe exceeds a predetermined threshold and send a control signal to the solenoid valve to open for deflation, and when the pressure returns to the detection initial state, the controller and/or computer may send a control signal to the solenoid valve to close and then resume performing the determination. The pumping and discharging pneumatic action of the air pump can be carried out according to a set period or controlled by a controller and/or a computer.
Through the technical scheme provided by the invention, the original temperature, pressure and humidity before measurement are original values of the underground part, and when the measurement is started, the electromagnetic valve 9 can be changed from a release gas circuit into a closed circulating gas circuit. At this moment, the concentration of the gas to be measured is measured, the temperature and the pressure of the gas in the period are slowly increased along with the time, after the measurement is finished, the electromagnetic valve 9 can be switched to the position of the gas releasing path, and the gas in the gas collecting chamber is released into the well pipe (or the measuring well) and finally released into the ground atmosphere. When the temperature and pressure in the gas collection chamber are restored to the initial state and are not changed, the electromagnetic valve 9 can be switched to the measurement state of the closed circulating gas circuit again to perform the second measurement. And the process is circulated.
The invention also provides an in-situ determination method of gas concentration, which comprises the following steps:
excavating a measuring well with a preset depth;
arranging a detection pipe in the measuring well to form a gas collection chamber at the bottom of the measuring well, wherein an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and the pipe wall of the detection pipe, the sealing partition plate and the bottom soil layer form the gas collection chamber; and
and detecting the parameter data of the gas to be detected in the gas collection chamber in situ.
FIG. 2 is a flow chart of an in situ box method determination method of gas flux according to an embodiment of the invention. In another aspect of the present invention, as shown in fig. 2, there is provided an in-situ box method for measuring gas flux, comprising: s100, excavating (or drilling) a measuring well with a preset depth; s102, arranging a detection pipe in the measuring well to form a gas collection chamber at the bottom of the measuring well, wherein an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and the pipe wall of the detection pipe, the sealing partition plate and the bottom soil layer form the gas collection chamber; s104, detecting the temperature and pressure of the gas in the gas collecting chamber and the concentration data of the gas to be detected in situ; and S106, calculating the flux of the gas to be measured at the bottom of the measuring well according to the temperature, the pressure and the concentration data of the gas to be measured in the gas collecting chamber detected at different time.
The above method can be implemented by an in-situ box method measuring device using the gas flux described above in the specification.
In an embodiment, the assay method provided in an embodiment of the present invention may further include: and before detecting the temperature, pressure and to-be-detected gas concentration data of the gas in the gas collection chamber, dehumidifying and drying the gas in the gas collection chamber.
In an embodiment, the assay method provided in an embodiment of the present invention may further include: releasing gas in the plenum when the detected pressure exceeds a predetermined threshold; and stopping releasing when the pressure of the gas in the gas collecting chamber is constant after releasing, and then continuously detecting the temperature, the pressure and the carbon dioxide concentration data of the gas in the gas collecting chamber in situ. In a preferred embodiment, when at least one of the detected pressure, temperature and humidity exceeds a predetermined threshold, releasing the gas in the plenum; and stopping releasing when the pressure, temperature and humidity of the gas in the gas collection chamber are constant after releasing, and then continuously detecting the temperature, pressure and concentration data of the gas to be detected in the gas collection chamber in situ
For the purposes of checking detection results and the like, in an embodiment, the temperature, the pressure and the concentration data of the gas to be detected in the gas collecting chamber can be detected in situ on the ground and underground respectively; and then comparing the surface and subsurface test data.
The underground working environment is greatly different from the above-ground working environment, and the testing instruments and devices have specific working conditions, for example, when the temperature or humidity is too low or too high, some devices cannot normally start or accurately complete the measurement, and the embodiment shown in fig. 3 is to solve the problem and ensure that each instrument or device can normally work underground.
An exemplary structure of the measuring apparatus according to the embodiment of the present invention will be described below with reference to fig. 3. In describing the embodiment shown in fig. 3, the same parts as those included in the embodiment shown in fig. 1 may be omitted. As shown in fig. 3, a second sealing partition plate 18 is further disposed in the detection tube 1 on a side of the first sealing partition plate 2 away from the opening of the detection tube 1, a closed space is defined by the second sealing partition plate 18, the first sealing partition plate 2 and the inner wall of the detection tube 1, and the temperature and humidity sensor 3, the pressure sensor 4, the gas concentration analyzer 6 and the dehumidifier 7 are disposed in the closed space. In the embodiment, two sealed spaces are formed downhole by the second sealing diaphragm 18, i.e. the second sealing diaphragm 18 to the surface and between the second sealing diaphragm 18 and the first sealing diaphragm 2. The arrangement of the second sealing partition 18 and the first sealing partition 2 enables various devices and instruments positioned therebetween to be basically protected, and the situation that water seepage, microorganism invasion, excessive humidity and the like affect the normal operation of the devices or instruments is avoided.
The ventilation pipe 11 penetrates through the second sealing partition 18 to lead the closed space to be communicated with the ground surface. By means of the ventilation pipe 11, dry clean air can be conveyed to the closed space from a control box arranged on the ground, and the conveyed air can also take away heat and moisture in the closed space and is conveyed to the ground along a measuring well pipe to be released, so that the gas concentration analyzer 6 is prevented from being overheated. Practice proves that when the underground ventilating pipe is arranged at 10m, the ventilating pipe 11 is not arranged, and the normal work of instruments and equipment can be ensured.
Due to the potential for water seepage downhole, in this embodiment, a submersible pump 12 is also provided, which is disposed within the collection chamber, while a water detection transmitter 13 (e.g., a water detector) may also be disposed within the collection chamber. The water accumulation detection transmitter 13 may detect the water level of the accumulated water in the collection chamber, and the submersible pump 12 may be turned on to discharge the accumulated water out of the collection chamber, for example, to the ground through the water pump pipe 24, when the accumulated water is present in the collection chamber and the water level reaches a predetermined height. In the embodiment, can realize water level detection through ponding detection transmitter 13, control immersible pump 12 work through the ground control box, when ponding detection transmitter 13 detected the water level and exceeded the setting value, start immersible pump 12 to the ponding in the plenum chamber is discharged to the earth's surface through drinking-water pipe 23.
In order to calibrate the gas concentration analyzer 6, a calibration gas inlet pipe 15 connected to the gas inlet end of the gas concentration analyzer 6 via a three-way solenoid valve 22 is provided in the embodiment. The calibration may be performed by pumping the calibration gas into the calibration gas inlet pipe 15 through a pump provided at the ground, wherein the pump may be controlled by a ground control box.
In the embodiment, three ends of the three-way electromagnetic valve 9 are respectively connected with the air inlet end of the dehumidifier 7, the circulation pipeline 5 and the ground measurement sampling air suction pipe 19. When the three-way electromagnetic valve 9 is actuated to enable the ground measurement sampling suction pipe 19 to be communicated with the circulating pipeline 5, the gas in the gas collecting chamber can be sent to the ground from the ground measurement sampling suction pipe 19, so that ground measurement of underground gas is realized. For example, the surface measurement sampling suction pipe 19 is connected to a gas concentration analyzer on the surface to perform surface sampling suction measurement. In this way, the measurement data can be calibrated both by surface and underground measurements, and also can be continuously detected by surface detection equipment when, for example, underground detection equipment fails. For example, it can be set that when the gas concentration analyzer at the bottom of the well is in a non-measurement mode, the gas concentration analyzer at the surface is started, and the measurement results of the gas concentration analyzer and the gas concentration analyzer are compared to achieve the purpose of verifying the measurement results. In addition, the ground surface measurement sampling air suction pipe 19 can also be used as a pipe for diffusion, and the underground temperature, pressure and humidity can be balanced by the ground surface measurement sampling air suction pipe 19 after one measurement is performed.
To ensure the effect, the lengths of the pipelines used in the above embodiments should be changed according to the detection depth, that is, no matter which depth is detected, it should be ensured that the ventilation pipe 11, the standard air intake pipe 15, the water pump pipe 24, and the ground measurement sampling suction pipe 19 can all be communicated with the ground.
The opening at the bottom of the detection tube 1 can be provided with a gas-collecting clapboard 14. The gas collection baffle 14 has a porous structure with a plurality of openings for the passage of gas into the plenum, which both allows gas (e.g., carbon dioxide) to enter the plenum through the openings and prevents foreign matter from entering the plenum. In a preferred embodiment, the gas collection baffle 14 has a shape that is concave from the opening toward the gas collection chamber, e.g., a cone shape.
In order to protect the detection equipment and make the detection result more accurate, a particle filter 16 can be connected in series on the circulating pipeline at the air inlet end of the dehumidifier 7 to filter the tiny particles in the air.
In an embodiment, non-sealing mounting plates 10 and 17 may be provided at appropriate positions inside the sensing tube 1 to mount or provide the sensing elements and the piping described above. Such a non-sealing mounting plate may be plural according to actual needs.
In an embodiment, the power supply of the detection element, the solenoid valve and the pump may be provided by a ground control box through a power cable. Accordingly, the signal generated by the detection element or the like may be transmitted to a control box on the ground through a signal cable. In order to ensure that the detection device can work uninterruptedly, an uninterruptible power supply (UPS power supply) can be arranged in a control box on the ground to ensure power supply.
In addition, it should be noted that the detailed composition of the apparatus is given in fig. 3 for illustrative purposes. In fig. 3, the ventilation pipe 11, the submersible pump 12, the accumulated water detection transmitter 13, the gas collection partition 14, the particle filter 16 and the like can be selectively designed and can be arranged according to a specific applicable environment, for example, when the measuring device is placed under the ground at 2000m, the ventilation pipe 11 must be arranged to ensure that the instrument can dissipate heat in time; furthermore, when the measuring device is placed in an underground environment with abundant water, a submersible pump 12 and a ponding detection transmitter 13 must be provided for ensuring and safe operation.
The assay device can have a plurality of operating modes, for example, a measurement mode, a calibration mode, and a sleep mode. The operation of each component of the measurement device may be different in each operation mode. The type and function of the solenoid valve in the measuring apparatus are described by table 1.
TABLE 1
Description of the working mode of an example of the measuring apparatus (taking the detection of carbon dioxide as an example):
1) and (4) measuring mode. The carbon dioxide analyzer at the bottom of the well is started to measure for 1 time when the measurement condition is met. The measurement conditions can be two, one is that the temperature, the pressure and the humidity in the gas collection chamber are recovered to the original state; the other is a timed power-on measurement. The recovery speed of pressure, temperature and humidity in the gas collection chamber needs to be considered during timing measurement, and the timing duration is longer than the recovery time. And (3) starting to electrify and preheat the carbon dioxide analyzer during each measurement, preheating for a preset time (for example, 3min), starting the air pump to measure, reading and storing after measuring the reaction time (for example, 10s), and powering off the carbon dioxide analyzer and the air pump after the measurement is finished.
2) And (5) calibration mode. And (4) manually operating on site to enter a mode, manually starting the mode after the mark gas is connected, and switching out after the mark gas is calibrated. Under the calibration mode, the three-way electromagnetic valves 22 and 23 are electrified to be opened, the pipeline is switched to be in the state of connecting the standard gas (namely, in fig. 3, the standard gas is discharged to a passage of a measuring well pipe from a vent pipe of the dehumidifier 7 after passing through the carbon dioxide analyzer 6 from the standard gas inlet pipe 15), the three-way electromagnetic valves 22 and 23 are manually powered off after the carbon dioxide analyzer finishes calibration, and the three-way electromagnetic valves 22 and 23 return to the pipeline connection state of the measurement mode. Based on this, the three-way solenoid valves 22 and 23 can be called as calibration solenoid valves, and are both normally closed points, and no power is consumed when the calibration is not performed.
3) Sleep protection mode. When the residual electric quantity of the UPS reaches a set point, the whole system can close the valves at all the inlets and the outlets with the outside, the measurement mode is terminated, the system can maintain the safety of the system for more than 24 hours by utilizing the residual electric quantity (simultaneously, the low-temperature frost damage is prevented, the generation of condensation is prevented), and then the system enters a sleep protection state. The sleep protection mode may be entered and released manually and automatically.
By the measuring device and the measuring method provided by the embodiment of the invention, the flux of the gas to be measured (for example, carbon dioxide) from the ground to the underground at the depth of more than one thousand meters can be monitored. The pressure, temperature and humidity monitoring probe is arranged in the gas collection chamber, so that the original state and the working state of the stratum can be conveniently sensed, and a basis is provided for the system control of the device. Taking carbon dioxide measurement as an example, a dehumidifying dryer is arranged in the measuring device to remove the interference of water vapor, so that the influence of humidity on the measurement of carbon dioxide concentration by an infrared method is eliminated, and the measuring precision is high and the repeatability is good. The in-situ measurement method ensures that the measurement is completely carried out under the conditions of original temperature, pressure, humidity and the like, and adopts a high-precision analyzer (with the error of 1ppm) to carry out the measurement, so that a system with small concentration change can be sensitively sensed. The forecasting time of the gas leakage can be greatly advanced.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention. For example, the carbon dioxide concentration analyzer is exchanged for a carbon monoxide, methane or other gas concentration analyzer to enable determination of carbon monoxide concentration/flux, methane or other gas concentration/flux.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (11)
1. An in-situ measurement device for a gas parameter, the measurement device comprising:
the detection pipe is arranged in a measuring well with a preset depth, an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a first sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and a gas collection chamber is formed by the pipe wall of the detection pipe, the first sealing partition plate and the bottom soil layer;
a gas parameter analyzer arranged in the detection pipe and configured to detect specific parameters of the gas to be detected in the gas collecting chamber in situ;
a temperature and humidity sensor arranged on the first sealing partition plate and configured to detect the temperature and humidity in the gas collection chamber;
a pressure sensor disposed on the first sealing diaphragm configured to detect a pressure in the plenum;
a circulating pipeline which is provided with an inlet and an outlet communicated with the gas collecting chamber; and
and the electromagnetic valve is arranged in the circulating pipeline and is configured to be opened to release air when at least one of the pressure, the temperature and the humidity detected by the pressure sensor and the temperature and humidity sensor exceeds a preset threshold value, and to be closed when the pressure, the temperature and the humidity detected by the pressure sensor and the temperature and humidity sensor are constant after air release.
2. The assay device according to claim 1, further comprising:
a dehumidifier configured to dehumidify and dry the gas flowing therethrough, the dehumidifier being serially connected with the gas parameter analyzer in the circulation line from an inlet to an outlet.
3. The assay device according to claim 2, further comprising: an air pump disposed in the circulation line between the dehumidifier and the gas parameter analyzer, configured to draw air in the plenum and send the drawn air to the gas parameter analyzer.
4. An apparatus according to claim 2, wherein the test tube further comprises a second sealing partition in the side of the first sealing partition away from the opening, the second sealing partition, the first sealing partition and the inner wall of the test tube defining a closed space, and the temperature/humidity sensor, the pressure sensor, the gas parameter analyzer and the dehumidifier are located in the closed space.
5. The assay device according to claim 4, further comprising a vent tube extending through the second sealed partition for communicating the enclosed space with a ground environment for venting.
6. The assay device according to claim 1, further comprising: a submersible pump and a water accumulation detector disposed in the plenum, the water accumulation detector configured to detect a level of accumulated water in the plenum, the submersible pump configured to open to drain accumulated water out of the plenum when the level of accumulated water in the plenum reaches a predetermined height.
7. The assay device of claim 1, wherein a gas collection baffle is provided at the opening at the bottom of the detector tube, the baffle having a plurality of apertures for passage of gas into the gas collection chamber.
8. The assay device of claim 1, further comprising a ground sampling suction pipe in communication with the plenum to enable delivery of the gas to be tested to the ground.
9. A method for in situ measurement of a gas parameter, the method comprising:
excavating a measuring well with a preset depth;
arranging a detection pipe in the measuring well to form a gas collection chamber at the bottom of the measuring well, wherein an opening at the bottom of the detection pipe is in contact with a bottom soil layer of the measuring well, a sealing partition plate is arranged in the detection pipe at a position adjacent to the opening, and the pipe wall of the detection pipe, the sealing partition plate and the bottom soil layer form the gas collection chamber;
detecting specific parameter data, temperature, humidity and pressure of the gas to be detected in the gas collection chamber in situ;
releasing gas in the plenum when at least one of the detected pressure, temperature, and humidity exceeds a predetermined threshold; and
and stopping releasing when the pressure, the temperature and the humidity of the gas in the gas collection chamber are constant after releasing, and then continuously detecting the temperature, the pressure and specific parameter data of the gas to be detected in the gas collection chamber in situ.
10. The assay method according to claim 9, further comprising:
before detecting the temperature, the pressure and specific parameter data of the gas to be detected in the gas collection chamber in situ, dehumidifying and drying the gas in the gas collection chamber.
11. The assay method according to claim 9, further comprising: detecting specific parameter data of the gas in the gas collecting chamber in situ on the ground and underground respectively; and
and comparing the detection data of the ground and the underground in-situ to check.
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| CN108871876B (en) * | 2018-03-27 | 2021-05-28 | 中国石油天然气股份有限公司 | Gas production column for monitoring carbon dioxide flux of soil in gas-filled zone of gas injection oil displacement well site |
| CN108692994A (en) * | 2018-04-24 | 2018-10-23 | 中国石油天然气股份有限公司 | Device and method for monitoring carbon dioxide flux of gas-filled zone soil in gas injection oil displacement well site |
| CN109239264B (en) * | 2018-08-31 | 2021-03-05 | 北京理加联合科技有限公司 | Pressure regulating structure of gas analyzer |
| CN109781943A (en) * | 2018-12-28 | 2019-05-21 | 中国农业大学 | Greenhouse gas emissions automatic detection device and system and method |
| CN111927429B (en) * | 2020-07-29 | 2022-02-11 | 北京理工大学 | Detection and early warning device and method for carbon dioxide stored in oil and gas field exploitation layer |
| CN112557629B (en) * | 2020-12-14 | 2023-08-08 | 中铁第一勘察设计院集团有限公司 | Soil gas flux measuring method |
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