CN108979632B - Simple gas sample collection device and method in exploration hole of stratum containing shallow gas - Google Patents
Simple gas sample collection device and method in exploration hole of stratum containing shallow gas Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/084—Obtaining fluid samples or testing fluids, in boreholes or wells with means for conveying samples through pipe to surface
Abstract
The invention belongs to the field of geotechnical engineering investigation in the field of civil engineering, and relates to a simple gas sample acquisition device and a simple gas sample acquisition method in an exploration hole of a stratum containing shallow gas, wherein the acquisition device comprises a funnel, a hose, a diaphragm pump, a gas-liquid separation container, a slurry discharge valve, a miniature air pump and a vacuum gas collecting bag; the funnel is communicated with the diaphragm pump through a hose; the diaphragm pump is communicated with the gas-liquid separation container through a hose; the top and the bottom of the gas-liquid separation container are respectively provided with a micro air pump and a pulp discharging valve; the miniature air pump is communicated with the vacuum air collecting bag. The invention provides a simple gas sample collection device and method in a exploration hole of a shallow gas-containing stratum, which is based on geological exploration drilling, is not limited by the embedding depth of the gas-containing stratum and is not easy to mix air or impurities in the gas production process.
Description
Technical Field
The invention belongs to the field of geotechnical engineering investigation in the field of civil engineering, relates to a simple gas sample collection device and a collection method, and particularly relates to a simple gas sample collection device and a simple gas sample collection method in an exploration hole of a shallow gas stratum.
Background
Shallow gas generally refers to shallow natural gas buried within 1500m below the surface. Formations rich in shallow gas are known as gas bearing formations. Gas bearing formations are commonly found in wetlands, estuaries, delta, lakes and seabed sediments and shallow formations where the oil and gas resources are relatively abundant. The gas in the soil layer is mainly derived from the gas which is formed by decomposing organic matters under the action of anaerobic bacteria, is generated in the process of deep oil gas, valance gas and magma rock making activities, and is confined in the shallow stratum by upward migration after seepage and diffusion. Shallow gas is present in different degrees in the coast of Zhejiang, the delta of Yangtze river, the Qidamu basin, the Songliao basin, the Bohai Bay basin and the middle-small basin in the Guangdong Gui area of south China, wherein the shallow gas in the coast of southeast and the downstream area of the Yangtze river including Su, zhejiang, hu, min, guangdong, qiong, xiang, hubei, jian and Gan is mainly distributed in the fourth series plain along the coast and the Jiang. The stratum containing gas belongs to a special geological disaster, namely shallow gas geological disaster, for civil engineering. The well-known Hangzhou bay cross-sea bridge in China has accidents of ship damage caused by shallow gas eruption and combustion in the early engineering investigation process. With the deep development of underground space in China, more and more projects encounter underground shallow gas, and shallow gas disasters and geology problems are more and more prominent. For engineering, when encountering a gas-containing stratum, the main occurrence layer position, the gas layer distribution area and the thickness of underground harmful gas are firstly required to be ascertained, and meanwhile, the main type, the composition, the gas production stage, the age and other information of the gas are also required to be ascertained, so as to infer the occurrence state, the gas source and the gas gathering process of the gas-containing stratum in the constructed engineering site and evaluate the possible damage degree to the engineering. This requires in situ sampling of the gas present in the gas bearing formation during the investigation and then carrying it into the laboratory for gas sample analysis. Therefore, the quality of the collected gas sample directly influences the accuracy of the test result, thereby influencing the reasonable judgment of the engineering.
At present, gas samples in gas-bearing stratum are collected in field investigation, and the gas samples are mostly dependent on in-situ static sounding or professional samplers of petroleum and natural gas departments. The in-situ static sounding method is to press a sounding rod into a gas-containing layer, gas overflows the ground surface through the hollow sounding rod, and a gas sampling bag or a sampling bottle is arranged at the outlet end of the static sounding rod to collect gas samples. Because the gas-containing stratum often produces water and gas simultaneously, the sprayed static touch probe often sprays water, gas and soil particles together, and the purity of the gas collected at the outlet end is seriously disturbed; meanwhile, the static sounding rod has poor tightness, and more air is mixed in the rod before gas in the gas-containing layer is sprayed out of the ground, so that a gas sample collected at the outlet end is not representative due to the mixed air, and the gas component in the original stratum cannot be truly reflected, thereby causing inaccurate gas sample assay analysis results. In addition, for gas bearing formations with relatively deep burial depths or with harder overburden, static sounding is difficult to push into and reach the target horizon for gas production. On the other hand, the professional sampler of the petroleum and natural gas department has complex structure and high price, and geotechnical engineering investigation units generally do not have the professional sampling equipment.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a simple gas sample collection device and a simple gas sample collection method in a exploration hole of a shallow gas-containing stratum, which are based on geological exploration drilling and are not limited by the embedding depth of the gas-containing stratum and are not easy to mix air or impurities in the gas production process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
simple gas sample collection device in exploration hole of shallow gas stratum, its characterized in that: the simple gas sample collection device in the exploration hole of the shallow gas-containing stratum comprises a funnel, a hose, a diaphragm pump, a gas-liquid separation container, a slurry discharging valve, a miniature air pump and a vacuum air collecting bag; the funnel is communicated with the diaphragm pump through a hose; the diaphragm pump is communicated with the gas-liquid separation container through a hose; the top and the bottom of the gas-liquid separation container are respectively provided with a micro air pump and a pulp discharging valve; the miniature air pump is communicated with the vacuum air collecting bag.
The simple gas sample collecting device in the exploration hole of the shallow gas-containing stratum further comprises a counterweight; the counterweight is of a hollow columnar structure, a hollow conical structure, a solid block structure or a solid disc structure; when the counterweight is of a hollow columnar structure or a hollow conical structure, the counterweight is sleeved on the funnel; when the counterweight is in a solid block structure or a solid disc structure, the counterweight is arranged on the funnel.
The funnel comprises a narrow opening and a wide opening opposite to the narrow opening; the narrow opening of the funnel is communicated with the diaphragm pump through a hose; the counterweight is sleeved on the funnel through a narrow opening of the funnel.
The wide mouth of the funnel is provided with a filter screen.
The simple gas sample collecting device in the exploration hole of the shallow gas-containing stratum further comprises a check valve arranged between the funnel and the diaphragm pump.
The simple gas sample collecting device in the exploration hole of the stratum containing shallow gas also comprises a silica gel tube arranged between the miniature air pump and the vacuum air collecting bag; the miniature air pump is communicated with the vacuum air collecting bag through a silicone tube; an air inlet valve is arranged on the silicone tube.
The vacuum gas collecting bag is one or more.
The simple gas sample collection device in the exploration hole of the shallow gas-containing stratum further comprises a negative pressure table arranged on the gas-liquid separation container.
A simple gas sample collection method in a exploration hole of a stratum containing shallow gas is characterized by comprising the following steps: the method comprises the following steps:
1) Simple gas sample collection device in investigation hole of assembled shallow gas-containing stratum: tightly connecting the funnel with the hose through a pipe hoop, and arranging a counterweight at the upper part of the funnel; then connecting the check valve and the diaphragm pump sequentially through a hose to ensure that the check valve is arranged at one side of the inlet end of the diaphragm pump; finally, connecting the diaphragm pump with the gas-liquid separation container through a hose; the top of the gas-liquid separation container is provided with a negative pressure meter, the bottom of the gas-liquid separation container is provided with a slurry discharging valve, and the top of the gas-liquid separation container is connected with a micro suction pump and a vacuum gas collecting bag through a silicone tube; an air inlet valve is arranged on the silicone tube;
2) Before starting gas sample collection, firstly checking the air tightness of the whole device; closing the pulp discharge valve and the air inlet valve; opening a diaphragm pump to fill the gas-liquid separation container with deaerated distilled water in a pipeline from the funnel to the gas-liquid separation container; closing a diaphragm pump, opening a slurry discharging valve at the lower part of the gas-liquid separation container, discharging deaerated distilled water in the gas-liquid separation container under the action of dead weight, and displaying a negative pressure value at the top of the gas-liquid separation container in a negative pressure meter; when the volume of water in the gas-liquid separation container to be discharged reaches about half of the volume of the water, closing a slurry discharging valve, observing and recording the reading of a negative pressure meter, and performing the step 3) until the reading of the negative pressure meter is unchanged;
3) Slowly placing the funnel into the exploration hole to ensure that the funnel does not turn over; under the action of gravity of the counterweight, the funnel is slowly arranged at the position of the layer containing the gas and is immersed below the liquid level of the gas-liquid mixed slurry in the hole in the exploration hole by no less than 1m;
4) Opening a diaphragm pump and controlling the rotating speed of the diaphragm pump, pumping the gas-liquid mixed slurry into a gas-liquid separation container by the diaphragm pump through a funnel and a hose, and closing the diaphragm pump after the gas-liquid mixed slurry is fully collected in the gas-liquid separation container; standing the gas-liquid separation container until soil particles, water and gas in the gas-liquid mixed slurry are automatically separated and layered;
5) And opening an air inlet valve, opening a micro air pump, collecting gas collected at the top of the gas-liquid separation container, and enabling the gas to enter the vacuum gas collection bag through the silica gel tube until the number of samples for collecting the gas samples meets the requirement.
The method further comprises the following step 5):
6) After the gas sample is collected, closing the air inlet valve; slowly lifting the hose to a position higher than the liquid level of the gas-liquid mixed slurry in the exploration hole by at least 1m, starting the diaphragm pump, and pumping all the gas-liquid mixed slurry remained in the pipeline into the gas-liquid separation container; opening a slurry discharging valve at the bottom of the gas-liquid separation container, discharging slurry and water in the gas-liquid separation container under the action of dead weight, and closing a diaphragm pump; and then the funnel is completely lifted out of the exploration hole and placed in a container filled with clear water, the diaphragm pump is started again, the pipeline of the whole system and the gas-liquid separation container are cleaned for at least three times, and no residual slurry is ensured in the gas-liquid separation container.
The invention has the advantages that:
the invention provides a simple gas sample collection device and a simple gas sample collection method in a exploration hole of a stratum containing shallow gas, wherein the device comprises a funnel, a hose, a diaphragm pump, a gas-liquid separation container, a slurry discharge valve, a miniature air pump and a vacuum air collecting bag; the funnel is communicated with the diaphragm pump through a hose; the diaphragm pump is communicated with the gas-liquid separation container through a hose; the top and the bottom of the gas-liquid separation container are respectively provided with a micro air pump and a pulp discharging valve; the miniature air pump is communicated with the vacuum air collecting bag. The funnel adopted by the invention is the inlet end of the device, the diameter of the funnel is slightly smaller than that of the exploration hole, and the funnel is used for increasing the contact area of the collecting inlet end and the gas-liquid mixed slurry in the exploration hole. The counterweight added on the funnel can ensure that the funnel is maintained in a posture without deflection when the hose is put into the exploration hole, and can also ensure that the funnel opening is always positioned below the liquid level of the gas-liquid mixed slurry in the exploration hole in the process of pumping the gas-liquid mixed slurry by the diaphragm pump. And a check valve arranged at the inlet end of the diaphragm pump for preventing the backflow of the extracted gas-liquid mixed slurry. The gas-liquid separation container is used for automatically separating soil particles, water and gas in the gas-liquid mixed slurry extracted in the gas production process, so that the separated gas is gathered at the top of the gas-liquid separation container, and the soil particles and the water are gathered at the bottom of the gas-liquid separation container. The invention is not limited by the embedding depth of the gas bearing layer, and solves the problems that the prior geotechnical engineering investigation field lacks simple gas production equipment, and air or impurities are easy to mix in the gas production process and the gas production process is not representative; the device has the advantages of simple structure, clear principle, convenient assembly, disassembly and operation, easy material acquisition and convenient popularization.
Drawings
FIG. 1 is a schematic diagram of a simple gas sample collection device in a exploration hole of a shallow gas-containing stratum;
FIG. 2 is a schematic diagram of a simple gas sample collection device in a exploration hole of a shallow gas-containing stratum according to the invention;
wherein:
1-gas-liquid mixed slurry; 2-a gas-bearing layer; 3-capping layer; 4-ploughing and planting soil layers on the surface; 5-exploratory holes; 6-funnel; 7-hose; 8-check valve; 9-balancing weight; 10-diaphragm pump; 11-a pulp discharge valve; 12-a gas-liquid separation vessel; 13-a negative pressure meter; 14-silicone tube; 15-a micro air pump; 16-vacuum air collecting bag; 17-intake valve.
Detailed Description
Referring to fig. 1, the invention provides a simple gas sample collecting device in a exploration hole of a shallow gas stratum, which comprises a funnel 6, a hose 7, a check valve 8, a counterweight 9, a diaphragm pump 10, a slurry discharging valve 11, a gas-liquid separation container 12, a negative pressure meter 13, a silicone tube 14, a micro air pump 15, a vacuum air collecting bag 16 and an air inlet valve 17.
The funnel 6 is an inlet end of the device, and the diameter of the funnel is slightly smaller than that of the exploration hole 5, so that the contact area between the collecting inlet end and the gas-liquid mixed slurry 1 in the exploration hole 5 is increased. The counterweight 9 is arranged at the upper part of the funnel 6, and is tightly contacted with the hose 7 in the process of pumping the gas-liquid mixed slurry 1 by the diaphragm pump 10, so that the attitude of the funnel 6 can be maintained without deflection when the hose 7 is put into the exploration hole 5, and the mouth of the funnel 6 can be always positioned below the liquid level of the gas-liquid mixed slurry 1 in the exploration hole 5 in the process of pumping the gas-liquid mixed slurry 1 by the diaphragm pump 10; a check valve 8 is arranged at the inlet end of the diaphragm pump 10 to prevent the backflow of the pumped gas-liquid mixed slurry 1. The diaphragm pump 10 has the advantage that it can handle gas-liquid mixed slurry 1 with a higher content of gravel and solids produced in the exploration bore 5.
The gas-liquid separation container 12 is used for automatically separating soil particles, water and gas in the gas-liquid mixed slurry 1 extracted in the gas production process, so that the separated gas is gathered at the top of the gas-liquid separation container 12, and the soil particles and the water are gathered at the bottom of the gas-liquid separation container 12; the top of the gas-liquid separation container 12 is provided with a negative pressure meter 13 and a miniature air extraction and collection system; the negative pressure gauge 13 is used to detect the air tightness of the whole device.
The micro air extraction and collection system is used for collecting the gas collected at the top of the gas-liquid separation container 12 into the vacuum gas collection bag 16 without mixing outside air or impurities; the micro air suction and collection system consists of a silicone tube 14, an air inlet valve 17, a micro air suction pump 15 and a vacuum air collection bag 16; the micro air pump 15 is used for pumping the gas in the gas-liquid separation container 12 into the vacuum air collecting bag 16; a slurry discharging valve 11 is provided at the bottom of the gas-liquid separation vessel 12 for discharging soil particles and water accumulated at the bottom of the gas-liquid separation vessel 12 and muddy water accumulated at the bottom of the gas-liquid separation vessel 12 in the cleaning of the whole apparatus; the diaphragm pump 10 is used for pumping the gas-liquid mixed slurry 1 in the shallow gas-containing stratum exploration hole 5, and the diaphragm pump 10 can treat sludge and slurry without blocking. The gas-liquid separation container 12 is utilized to automatically separate the soil particles, water and gas in the extracted gas-liquid mixed slurry 1, the separated gas is gathered at the top of the gas-liquid separation container 12, and the soil particles and water are gathered at the bottom of the gas-liquid separation container 12; a negative pressure meter 13 is arranged at the top of the gas-liquid separation container 12 and is used for detecting the air tightness of the whole device and the pipeline before gas production; the miniature air suction and collection system consists of an air inlet valve 17, a miniature air suction pump 15, a vacuum air collection bag 16 and a silicone tube 14; with this system, the gas accumulated at the top of the gas-liquid separation vessel 12 can be taken into the vacuum gas collection bag 16, ensuring that pure gas is collected.
Referring to fig. 2, the simple gas sample collection device in the exploration hole of the stratum containing shallow gas provided by the invention is used according to the following working steps:
1) Preparing. Firstly, exploration and drilling work should be carried out in a shallow gas-containing field. The exploration hole 5 must penetrate through the earth surface cultivated soil layer 4 and the cover layer 3 of the underground shallow air, enter the air-bearing layer 2 of the shallow air to a certain depth, preliminarily determine the depth position of the air-bearing layer 2 of the shallow air, determine that continuous air is emitted out of the drill hole (bubbles overflow from the macroscopic observation hole), and the duration is longer than 30min, so that the exploration hole 5 is suitable for collecting air samples of the underground shallow air.
2) And assembling the gas sample collecting device on site. Tightly connecting the funnel 6 and the hose 7 through a pipe hoop, and fixing a counterweight 9 on the upper part of the funnel 6; then, the check valve 8 and the diaphragm pump 10 are connected in sequence through the hose 7, and carefully examined, ensuring that the check valve 8 is disposed on the inlet end side of the diaphragm pump 10; finally, the diaphragm pump 10 is connected with the gas-liquid separation container 12 through the hose 7. The top of the gas-liquid separation container 12 is provided with a negative pressure meter 13, the bottom is provided with a pulp discharging valve 11, and the top of the gas-liquid separation container 12 is also connected with a miniature air suction and collection system through a silicone tube 14. The micro air extraction and collection system consists of an air inlet valve 17, a micro air pump 15 and a vacuum air collection bag 16, wherein the vacuum air collection bag 16 is connected with the micro air pump 15 through a silicone tube 14, and the micro air pump 15 is connected with the top of the gas-liquid separation container 12 through the silicone tube 14 and the air inlet valve 17.
3) And (5) collecting an on-site gas sample. Before the gas sample collection is started, the air tightness of the whole device is checked. The pulp discharge valve 11 and the air inlet valve 17 of the micro air extraction and collection system are closed. The diaphragm pump 10 is turned on, and the gas-liquid separation vessel 12 and the line from the funnel 6 to the gas-liquid separation vessel 12 are filled with deaerated distilled water. The diaphragm pump 10 is closed, the slurry discharge valve 11 at the lower part of the gas-liquid separation vessel 12 is opened, the deaerated distilled water in the gas-liquid separation vessel 12 is discharged under the action of self weight, and the negative pressure value at the top of the gas-liquid separation vessel 12 is shown in the negative pressure table 13. When the water in the gas-liquid separation vessel 12 is discharged to about half of its volume, the pulp discharge valve 11 is closed, and the reading of the negative pressure meter 13 is observed and recorded. After 30min, if the reading of the negative pressure meter 13 is unchanged, the whole device is good in air tightness, and the next gas sample collection work can be started. Otherwise, the pipeline joint of the whole device needs to be carefully checked to check whether leakage exists, the repairing is carried out, and the air tightness checking process is repeated until the whole device meets the air tightness requirement, and then the next air sample collecting work can be carried out.
4) The funnel 6 is slowly placed into the exploration hole 5, and the hose 7 is slowly lowered in the whole process, so that the funnel 6 is ensured not to be turned over. Under the action of gravity of the counterweight 9, the funnel 6 is slowly arranged at the position of the gas-containing layer 2 and is immersed below the liquid level of the gas-liquid mixed slurry 1 in the hole in the exploration hole 5 by no less than 1m.
5) Because of the pressure of the shallow gas existing in the gas-bearing layer 2, the shallow gas is continuously released into the exploration holes 5 and forms gas-liquid mixed slurry 1 in the holes with the slurry water in the holes. The diaphragm pump 10 is opened, the rotating speed of the diaphragm pump 10 is controlled, the pumping speed of the gas-liquid mixed slurry 1 in the exploratory hole 5 is controlled, and after the gas-liquid mixed slurry 1 is fully collected in the gas-liquid separation container 12, the diaphragm pump 10 is closed. The gas-liquid separation vessel 12 is left to stand for 15min, and the gas, water and soil particles are automatically separated and layered due to the different weights of the soil particles, water and gas in the gas-liquid mixed slurry 1. The gas is most light and gathers at the top of the gas-liquid separation vessel 12, and the soil particles and water gather at the bottom of the gas-liquid separation vessel 12.
6) An air inlet valve 17 on the micro air extraction and collection system is opened, a micro air extraction pump 15 is opened, gas collected at the top of the gas-liquid separation container 12 is collected, and the gas enters a vacuum air collection bag 16 through a silicone tube 14. After one vacuum air collection bag 16 is fully sampled, the micro air pump 15 is closed, the vacuum air collection bag 16 is removed, and the other vacuum air collection bag 16 is connected. And repeating the working of the step until the number of the samples for collecting the gas samples meets the requirement.
7) After the gas sample is collected, closing an air inlet valve 17 on the micro air extraction and collection system. The hose 7 is slowly lifted up, the funnel 6 is lifted to a position which is higher than the liquid level of the gas-liquid mixed slurry 1 in the exploration hole 5 by not less than 1m, the diaphragm pump 10 is started, and all the gas-liquid mixed slurry 1 remained in the pipeline is pumped into the gas-liquid separation container 12. The slurry discharge valve 11 at the bottom of the gas-liquid separation vessel 12 is opened to discharge all the slurry and water in the gas-liquid separation vessel 12 under the action of its own weight, and the diaphragm pump 10 is closed. And then the funnel 6 is completely lifted out from the exploration hole 5 and placed in a container filled with clear water, the diaphragm pump 10 is started again, the pipelines of the whole system and the gas-liquid separation container 12 are cleaned for at least three times, and after no residual slurry in the gas-liquid separation container 12 is confirmed, the cleaning work can be stopped.
8) And removing all parts of the instrument, collecting and assembling the instrument so as to be reused when gas sample collection is carried out next time.
Claims (5)
1. A collection method of a simple gas sample collection device in a exploration hole of a shallow gas-containing stratum is characterized by comprising the following steps of: the simple gas sample collection device in the exploration hole of the shallow gas-containing stratum comprises a funnel (6), a hose (7), a counterweight (9), a diaphragm pump (10), a gas-liquid separation container (12), a slurry discharging valve (11), a miniature air pump (15) and a vacuum air collecting bag (16); the funnel (6) is communicated with the diaphragm pump (10) through a hose (7); the diaphragm pump (10) is communicated with the gas-liquid separation container (12) through a hose (7); the top and the bottom of the gas-liquid separation container (12) are respectively provided with a micro air pump (15) and a pulp discharging valve (11); the miniature air pump (15) is communicated with the vacuum air collecting bag (16), and the counterweight (9) is arranged on the funnel (6);
the method comprises the following steps:
1) Simple gas sample collection device in investigation hole of assembled shallow gas-containing stratum: tightly connecting the funnel (6) and the hose (7) through a pipe hoop, and arranging a counterweight (9) at the upper part of the funnel (6); then sequentially connecting the check valve (8) and the diaphragm pump (10) through a hose (7), and ensuring that the check valve (8) is arranged at one side of the inlet end of the diaphragm pump (10); finally, the diaphragm pump (10) is connected with the gas-liquid separation container (12) through a hose (7); the top of the gas-liquid separation container (12) is provided with a negative pressure meter (13), the bottom of the gas-liquid separation container is provided with a pulp discharging valve (11), and the top of the gas-liquid separation container (12) is connected with a micro sucking pump (15) and a vacuum air collecting bag (16) through a silicone tube (14); an air inlet valve (17) is arranged on the silicone tube (14);
2) Before starting gas sample collection, firstly checking the air tightness of the whole device; closing the pulp discharge valve (11) and the air inlet valve (17);
opening a diaphragm pump (10), and filling the gas-liquid separation container (12) and a pipeline between the funnel (6) and the gas-liquid separation container (12) with deaerated distilled water; closing a diaphragm pump (10), opening a slurry discharge valve (11) at the lower part of a gas-liquid separation container (12), discharging deaerated distilled water in the gas-liquid separation container (12) under the action of dead weight, and displaying a negative pressure value at the top of the gas-liquid separation container (12) in a negative pressure meter (13); when the volume of water in the gas-liquid separation container (12) to be discharged reaches about half of the volume of the water, the slurry discharging valve (11) is closed, and the reading of the negative pressure meter (13) is observed and recorded until the reading of the negative pressure meter (13) is unchanged, the step 3 is carried out;
3) Slowly placing the funnel (6) into the exploration hole (5) to ensure that the funnel (6) does not turn over; under the action of gravity of the counterweight (9), the funnel (6) is slowly arranged at the position of the layer of the gas-containing layer (2) and is immersed below the liquid level of the gas-liquid mixed slurry (1) in the hole in the exploration hole (5) by not less than 1m;
4) Opening a diaphragm pump (10) and controlling the rotating speed of the diaphragm pump (10), pumping the gas-liquid mixed slurry (1) into a gas-liquid separation container (12) by the diaphragm pump (10) through a funnel (6) and a hose (7), and closing the diaphragm pump (10) after the gas-liquid mixed slurry (1) is fully collected in the gas-liquid separation container (12); standing the gas-liquid separation container (12) until soil particles, water and gas in the gas-liquid mixed slurry (1) are automatically separated and layered;
5) Opening an air inlet valve (17), opening a micro air pump (15), collecting gas collected at the top of the gas-liquid separation container (12), and enabling the gas to enter a vacuum air collecting bag (16) through a silicone tube (14) until the number of samples for collecting gas samples meets the requirement;
the method further comprises, after step 5): 6) After the gas sample is collected, closing an air inlet valve (17); slowly lifting the hose (7) to enable the funnel (6) to be lifted to a position which is higher than the liquid level of the gas-liquid mixed slurry (1) in the exploration hole (5) by not less than 1m, starting the diaphragm pump (10), and pumping all the gas-liquid mixed slurry (1) remained in the pipeline into the gas-liquid separation container (12); opening a slurry discharging valve (11) at the bottom of the gas-liquid separation container (12), discharging all slurry and water in the gas-liquid separation container (12) under the action of dead weight, and closing a diaphragm pump (10); and then the funnel (6) is completely lifted out from the exploration hole (5), placed in a container filled with clear water, the diaphragm pump (10) is started again, the pipeline of the whole system and the gas-liquid separation container (12) are cleaned for at least three times, and no residual slurry in the gas-liquid separation container (12) is confirmed.
2. The method for collecting the simple gas sample collection device in the exploration hole of the stratum containing shallow gas according to claim 1, wherein the method comprises the following steps: the counterweight (9) is of a hollow columnar structure, a hollow conical structure, a solid block structure or a solid disc structure; when the counterweight (9) is of a hollow columnar structure or a hollow conical structure, the counterweight (9) is sleeved on the funnel (6); when the counterweight (9) is of a solid block structure or a solid disc structure, the counterweight (9) is arranged on the funnel (6).
3. The method for collecting the simple gas sample collection device in the exploration hole of the stratum containing shallow gas according to claim 2, wherein the method comprises the following steps: the funnel (6) comprises a narrow opening and a wide opening opposite to the narrow opening; the narrow opening of the funnel (6) is communicated with the diaphragm pump (10) through a hose (7); the counterweight (9) is sleeved on the funnel (6) through a narrow opening of the funnel (6).
4. A method of collecting a simple gas sample collection device in a survey hole of a shallow gas-containing formation according to claim 3, wherein: the wide mouth of the funnel (6) is provided with a filter screen.
5. The method for collecting the simple gas sample collection device in the exploration hole of the stratum containing shallow gas according to claim 1, wherein the method comprises the following steps: the vacuum air collection bag (16) is one or more.
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| CN110672613A (en) * | 2019-11-01 | 2020-01-10 | 中国科学院武汉岩土力学研究所 | Portable in-situ gas concentration measuring device and method for shallow gas-bearing stratum |
| CN110656926B (en) * | 2019-11-14 | 2024-02-09 | 上海市城市建设设计研究总院（集团）有限公司 | Application method of shallow harmful gas detection device based on drilling equipment |
| CN111024923A (en) * | 2019-12-03 | 2020-04-17 | 中国电建集团华东勘测设计研究院有限公司 | Gas evolution in soil and gas-containing soil mechanics measuring device |
| CN113417628A (en) * | 2021-07-21 | 2021-09-21 | 上海市城市建设设计研究总院（集团）有限公司 | Continuous detection and release method based on drilling machine shallow harmful gas detection device |
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| US20110305514A1 (en) * | 2010-06-14 | 2011-12-15 | Mohammad Rassa | ESPRIZ funnel system |
| JP6288783B2 (en) * | 2016-01-21 | 2018-03-07 | 秀実 田中 | Gas extraction / separation unit for gas-liquid mixed fluid observation equipment in the ground |
| CN107956456B (en) * | 2017-11-30 | 2023-05-23 | 青岛海洋地质研究所 | Gas-water-sand three-phase injection allocation system and method for simulating hydrate simulation exploitation |
| CN208749350U (en) * | 2018-09-06 | 2019-04-16 | 中国科学院武汉岩土力学研究所 | Simple gas sample collecting device for air in a kind of exploratory hole on the stratum containing shallow gas |
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