CN209264374U - An in-situ gas sampling probe for shallow gas-bearing formations - Google Patents

Abstract

The utility model discloses an in-situ gas sample collection probe for shallow gas-bearing formations, which mainly consists of a first part of the probe, a second part of the probe, a third part of the probe, a fourth part of the probe and a fifth part of the probe from bottom to top The first part of the probe includes a probe tube A and a ring-shaped permeable stone, the second part of the probe is filled with a sponge protection body A, and a double-headed injection needle A is installed inside the sponge protection body A, and the third part of the probe is installed There is a double-mouthed aluminum vacuum bottle, the fourth part of the probe is filled with a sponge protection body B, and the sponge protection body B is equipped with a double-headed injection needle B, and the top of the fifth part of the probe is equipped with a fixed magnetic pole plate and a movable magnetic pole plate And a single-port aluminum vacuum bottle, the bottom of the single-port aluminum vacuum bottle is the bottle mouth, and the top of the fixed magnetic pole plate is connected with a cable. The utility model has the advantages of simple structure, easy to carry, etc., equipped with a common static penetrometer, can obtain the in-situ gas sample in the predetermined gas-bearing layer.

Description

An in-situ gas sampling probe for shallow gas-bearing formations

technical field

The utility model relates to the field of geotechnical engineering investigation in the field of civil engineering, in particular to an in-situ gas sample collection probe for shallow gas-bearing strata, which is applicable to gas-bearing strata with different gas components and different soil properties.

Background technique

Shallow gas generally refers to the natural gas (including organic, inorganic or mixed origin gas) buried within 1500m below the surface, and the strata rich in shallow gas are called gas-bearing strata. Gas-bearing formations are generally distributed in marsh wetlands, estuaries, deltas, lakes, and seabed sediments, as well as shallow formations rich in oil and gas resources. The gas in the soil layer mainly comes from biogenic gas formed by the decomposition of organic matter under the action of anaerobic bacteria, deep oil and gas, mantle gas, and magmatic activity, and is sealed in the shallow surface by upward migration after seepage and diffusion. gas in the formation. Shallow gas occurs to varying degrees in my country's Jiangsu and Zhejiang coastal areas, Yangtze River Delta, Qaidam Basin, Songliao Basin, Bohai Bay Basin, and small and medium-sized basins in the southern Yunnan, Guizhou, Guangdong, and Guangxi regions. Shallow gas in areas including Jiangsu, Zhejiang, Shanghai, Fujian, Guangdong, Qiong, Hunan, Hubei, and Jiangxi is mainly distributed in the Quaternary plains along the coast and along the river. For civil engineering, gas-bearing formations are a special kind of engineering geological hazards, that is, shallow gas geological hazards. my country's famous Hangzhou Bay Cross-sea Bridge has experienced accidents in which shallow gas eruption and combustion caused ship damage and personal injury during the early stage of engineering investigation. With the deepening of underground space development in my country, more and more projects have encountered underground shallow gas, and the problem of shallow gas geological hazards has become more and more prominent. When a project encounters a formation containing gas or harmful gas, it is first necessary to find out the source of the gas in the formation, the main storage layer, the distribution range, etc., and the acquisition of in-situ gas samples in the gas-bearing formation is very important for the inversion project The gas-producing environment, gas-producing age and gas migration and accumulation process of the gas-bearing soil layer in the site are very important. Therefore, the collection quality of in-situ gas samples will directly affect the accuracy of the test results, and then affect the rational inference of the inversion.

At present, on-site surveys in shallow gas geological regions mostly rely on in-situ static penetration testing, drilling or professional samplers from the oil and gas sector. Most of the gas sampling methods adopt drilling to form a hole first, and then put the sampler into the borehole on the surface to collect gas samples after the hole is formed. Due to pre-drilling, this method often causes the formation to be mixed with gas and outside air at different depths, so that the gas samples taken are not completely obtained from the predetermined gas-bearing formations, which may lead to inaccurate assays result. On the other hand, professional samplers in the oil and gas sector are complex in structure, expensive, heavy and inconvenient to carry. It is difficult for general geotechnical engineering investigation units to have these professional sampling equipment.

Utility model content

Aiming at the deficiencies of the existing technology, the purpose of this utility model is to provide an in-situ gas sample collection probe for shallow gas-bearing formations. The in-situ gas sample collection probe has the advantages of simple structure and portability. Equipped with an ordinary static penetrating sounder, the in-situ gas sample in the predetermined gas-bearing layer can be obtained; it solves the lack of simple in-situ gas sample collection device and It is easy to be mixed with other impurities during the gas extraction process.

The purpose of this utility model is achieved through the following technical solutions:

An in-situ gas sample collection probe for shallow gas-bearing formations. The in-situ gas sample collection probe is mainly composed of the first part of the probe, the second part of the probe, the third part of the probe, the fourth part of the probe, and the fifth part of the probe. The first part of the probe consists of a probe tube A and a ring-shaped permeable stone set outside the probe tube A. The inside of the probe tube A has a probe lumen, and the tube wall of the probe tube A has a A number of ventilation holes communicated with the probe lumen, the air inlet end of the ventilation holes is in corresponding contact with the inner wall of the ring-shaped permeable stone; the second part of the probe includes a probe tube B, and the inside of the probe tube B is filled with sponge A protective body A, a double-ended injection needle A is fixed inside the sponge protective body A, and the double-ended injection needle A includes an upper injection needle A and a lower injection needle A, and the lower injection needle A corresponds to the lumen of the probe; The third part of the probe includes a double-port aluminum vacuum bottle, the bottom bottle mouth of the double-port aluminum vacuum bottle is sealed with a lower silicone plug A corresponding to the upper injection needle A, and the double-port aluminum vacuum bottle The upper bottle mouth is sealed with an upper silicone plug A; the fourth part of the probe includes a probe tube D, and the inside of the probe tube D is filled with a sponge protection body B, and a double-headed injection needle B is fixed inside the sponge protection body B , the double-headed injection needle B includes an upper injection needle B and a lower injection needle B, and the lower injection needle B corresponds to the upper silicone plug A of the top bottle mouth of the double-port aluminum vacuum bottle in the third part of the probe; The fifth part of the probe includes a probe tube E, a fixed magnetic pole plate is fixed on the top of the lumen of the probe tube E, and a movable magnetic pole plate is installed on the top of the lumen of the probe tube E, and the movable magnetic pole plate is located on the fixed magnetic pole plate. Below, a spring is connected between the movable magnetic pole plate and the fixed magnetic pole plate, a single-port aluminum vacuum bottle is installed in the lumen of the probe tube E, the bottom of the single-port aluminum vacuum bottle is the bottle mouth, and the top of the single-port aluminum vacuum bottle is Connected with the movable magnetic pole plate, a second silica gel stopper is hermetically installed on the mouth of the bottom of the single-port aluminum vacuum bottle, and the upper injection needle B corresponds to the second silica gel plug at the bottom of the single-port aluminum vacuum bottle; Cables are connected to the top of the fixed magnetic pole plate.

In order to better realize the utility model, a fixed shrapnel is symmetrically fixed on the inner wall of the probe tube D of the fourth part of the probe. Lifting part, when in use, press down the double-ended injection needle B firmly, the two protrusions of the double-ended injection needle B can step over or pass through the fixed shrapnel, and the two protrusions of the double-ended injection needle B are snapped on Two fixed shrapnel without rebound.

Preferably, the utility model further includes a probe tube, and the cable is arranged in the lumen of the probe tube.

Preferably, a connecting line between the fixed magnetic pole plates and the movable magnetic pole plates is further connected.

As a preference, the bottom of the movable magnetic pole plate is fixed with a clamping sleeve, and the top of the single-port aluminum vacuum bottle is snapped into the clamping sleeve; a support rod is also connected between the fixed magnetic pole plate and the movable magnetic pole plate.

As preferably, the top of the probe pipe A of the first part of the probe has a first threaded pipe string, the bottom of the probe pipe B of the second part of the probe is threaded with the first threaded pipe string, and the probe in the first threaded pipe string The top of the lumen is sealed with a first silica gel plug; the top of the probe tube B of the second part of the probe has a second threaded column, the third part of the probe includes the probe tube C, and the double-port aluminum vacuum bottle is installed in cooperation In the probe tube C, the bottom of the probe tube C is threadedly connected with the second threaded pipe column; the top of the probe tube C has a third threaded pipe column, and the top of the probe tube D of the fourth part of the probe has a fourth threaded tube column, the bottom of the probe tube D of the fourth part of the probe is threaded with the third threaded tube column, the bottom of the probe tube E of the fifth part of the probe is threaded with the fourth threaded tube column, and the single-port aluminum vacuum bottle is matched with Installed in probe tube E.

Preferably, a tapered probe cone is fixed at the bottom of the probe tube A of the first part of the probe.

Preferably, the ventilation holes are circular, and the ventilation holes are arranged along the tube wall of the probe tube A in a circumferential manner, and all the ventilation holes are evenly stacked from the bottom of the tube wall of the probe tube A to the top of the tube wall.

As a preference, the utility model also includes a static penetrating probe rod and a static penetrating probe, the top of the static penetrating probe rod is installed on the static penetrating probe, and the static penetrating probe rod is described in several sections. The in-situ gas sample collection probe is assembled at the bottom of the static penetrating probe rod.

The in-situ gas sample collection probe of the utility model is divided into five parts, and the five parts are the first part of the probe, the second part of the probe, the third part of the probe, the fourth part of the probe, and the fifth part of the probe from bottom to top. It consists of a hole, a probe lumen, an annular permeable stone, a probe cone, and a first silica gel plug. The outer wall of the first part of the probe is a ring-shaped permeable stone, which can block the mud particles in the air-bearing layer outside, and allow water and air to freely enter the probe cavity of the first part of the probe; this cavity can temporarily store external water and air, and preliminary separation of water and air (because air is lighter than water); several ventilation holes are dug between the ring-shaped permeable stone and the probe tube cavity, and the in-situ water and gas in the predetermined air-bearing layer can pass through the ring. The ring-shaped permeable stone enters the vent hole, and then enters the probe lumen (multiple vent holes can prevent some holes from being blocked, and the external water and air cannot enter the probe lumen of the first part of the probe through the ring-shaped permeable stone); the first The silicone plug is located on the top of the probe lumen of the first part of the probe. The function of the first silicone plug is to prevent the water and gas stored in the probe lumen of the first part of the probe from penetrating into the second part of the probe; In-situ water and gas samples are collected and initially stored in the stratum.

The second part of the probe is mainly composed of a double-ended injection needle A and a sponge protection body A. The thread at the bottom of the second part of the probe can be screwed with the first threaded pipe string at the top of the first part of the probe, and the second threaded pipe string at the top of the second part of the probe can be screwed with the thread at the bottom of the third part of the probe; the double-ended injection needle A is vertical Put it straight in the second part of the probe, when the lower injection needle A of the double-ended injection needle A is inserted into the first silicone plug in the first part of the probe, the upper injection needle A of the double-ended injection needle A is inserted into the double-port aluminum plug of the third part of the probe When the lower silicone plug A of the vacuum bottle is made, the probe lumen of the first part of the probe can be connected with the double-mouthed aluminum vacuum bottle of the third part of the probe (light in weight and not easy to rust), so that the in-situ water sample and gas sample can be sucked into the double port. In an aluminum vacuum bottle; the sponge protector A is filled around the double-ended injection needle A to fix the double-ended injection needle A and prevent its position from shifting, and the sponge protector A can also protect the double-ended injection needle A acts as a support, preventing its needle from prematurely inserting into the adjacent silicone stopper.

The third part of the probe consists of a silicone plug and a double-mouthed aluminum vacuum bottle (light in weight and not easy to rust). The threaded structure at the lower part of the third part of the probe can be tightened with the second threaded pipe column at the top of the second part of the probe; the double-mouthed aluminum vacuum bottle is placed vertically in the probe tube C of the third part of the probe; the double-mouthed aluminum vacuum bottle The upper and lower bottle mouths are respectively sealed with an upper silicone plug A and a lower silicone plug A; the internal vacuum of the double-mouthed aluminum vacuum bottle can be connected to the lower end of the double-headed injection needle A, and the in-situ water sample of the first part of the probe Inhale the gas sample into a double-mouthed aluminum vacuum bottle. The double-port aluminum vacuum bottle can also realize the separation of gas and water (because gas is lighter than water, the gas is at the top, and the water is at the bottom), ensuring that after docking with the double-headed injection needle B of the fourth part of the probe, the single-port aluminum vacuum bottle The bottle can collect a pure in-situ gas sample.

The fourth part of the probe consists of a double-ended injection needle B, a fixed shrapnel, and a sponge protection body B. The threaded structure at the bottom of the fourth part of the probe can be screwed with the third threaded column at the top of the third part of the probe, and the fourth threaded column at the top of the fourth part of the probe can be screwed with the threaded structure at the bottom of the fifth part of the probe. Place the double-ended injection needle B vertically in the middle of the probe tube D of the fourth part of the probe. The bottom of the double-ended injection needle B can be inserted into the upper silicone plug A of the double-port aluminum vacuum bottle in the third part of the probe. Insert it into the second silicone plug at the lower part of the single-port aluminum vacuum bottle to connect the single-port aluminum vacuum bottle and the double-port aluminum vacuum bottle; The gas sample is inhaled into the single-port aluminum vacuum bottle in the fifth part of the probe through the double-ended injection needle B; the sponge protector B is filled around the double-ended injection needle B, and fixes the double-ended injection needle B to prevent its position Offset occurs, and at the same time, the sponge protective body B can also support the double-ended injection needle B, preventing its needle from being inserted into the silicone plug in advance. The fixed shrapnel is fixed in the tube wall of the fourth part of the probe. When the probe needs to be recovered after sampling, the double-ended injection needle B can be stuck in a fixed position, so that the upper part of the double-ended injection needle B and the fifth part of the probe The second silica gel plug at the lower part of the middle single-port aluminum vacuum bottle is completely separated, and the single-port aluminum vacuum bottle is completely sealed to ensure that other gases will not enter the single-port aluminum vacuum bottle during the recovery of the probe, ensuring the collected in-situ gas samples pure.

The fifth part of the probe consists of a single-port aluminum vacuum bottle (light in weight and not easy to rust), a movable magnetic pole plate, a clip sleeve, a connection line between the magnetic pole plates, a spring, a support rod, a fixed magnetic pole plate, and a cable. The threaded structure at the bottom of the fifth part of the probe can be tightened with the fourth threaded column at the top of the fourth part of the probe; the single-port aluminum vacuum bottle is tightly clamped on the clip sleeve at the bottom of the movable magnetic pole plate to keep the single-port aluminum vacuum bottle The vacuum in the bottle can be connected with the double-headed injection needle B of the fourth part of the probe and the double-mouthed aluminum vacuum bottle of the third part of the probe, and the in-situ pure gas sample after the gas-water separation in the double-mouthed aluminum vacuum bottle is collected. In a single mouth aluminum airless bottle. A spring is connected between the movable magnetic pole plate and the fixed magnetic pole plate, and there is also a support rod in the spring to connect the upper and lower magnetic pole plates together. The tensile limit provided by the support rod is slightly greater than the elastic force generated by the compression of the spring, so that the spring between the movable magnetic pole plate and the fixed magnetic pole plate remains in a compressed state; plate and movable magnetic pole plate and extend to the surface. After the power is turned on, the magnetism of the fixed magnetic pole plate is changed by changing the electrode on the surface power supply, so that a repulsive force is generated between the fixed magnetic level plate and the movable magnetic level plate; the method of changing the current through the power supply operation, To adjust the size of the repulsive force; with the elastic force of the spring, when the tension limit of the supporting rod is not enough to resist the elastic force of the spring and the repulsive force between the magnetic poles, the supporting rod is pulled off, and the movable magnetic pole plate obtains the power provided by the elastic force and repulsive force, and cooperates with the single port The aluminum vacuum bottle moves down together, and finally the single-port aluminum vacuum bottle, double-ended injection needle B, double-port aluminum vacuum bottle, double-ended injection needle A, and the probe lumen of the first part of the probe are connected together, through the ring-shaped water-permeable After the in-situ water and gas samples entering the internal cavity are separated from the gas and water in the double-port aluminum vacuum bottle, the in-situ gas sample finally enters the single-port aluminum vacuum bottle to complete the collection of the in-situ gas sample.

An in-situ gas sample collection method for shallow gas-bearing formations, including an in-situ gas sample collection probe, the collection method is as follows:

A. On-site device assembly: first assemble the first part of the in-situ gas sample collection probe: vacuumize and saturate the ring-shaped permeable stone in the first part of the probe to remove the air in it, and then install and fix the ring-shaped permeable stone on the first part of the probe Part of the outer side of the probe tube A, to ensure that the surface of the ring-shaped permeable stone and the first part of the probe are smooth, so that the inner wall of the ring-shaped permeable stone and the ventilation hole are closely fitted together to ensure that the in-situ gas sample can enter the ventilation through the ring-shaped permeable stone After the hole, enter the probe lumen of the first part of the probe; then assemble the second part of the probe: tighten the thread between the bottom of the second part of the probe and the top of the first part of the probe, and then put the double-ended injection needle A wrapped by the sponge protection body A vertically Place it straight inside the probe tube B of the second part of the probe; then assemble the third part of the probe, first place the double-mouthed aluminum vacuum bottle vertically in the probe tube C of the third part of the probe, and then connect the bottom of the third part of the probe with the probe Tighten the thread on the top of the second part; then assemble the fourth part of the probe, tighten the bottom of the fourth part of the probe and the top of the third part of the probe, and then place the double-ended injection needle B wrapped by the sponge protection body B vertically on the first part of the probe The inside of the four-part probe tube D; finally assemble the fifth part of the probe, first pass the cable through the probe tube in advance, and tightly clamp the single-port aluminum vacuum bottle to the clamping sleeve at the lower end of the movable magnetic pole plate, and then upward Push the movable magnetic pole plate and compress the spring so that the support rod hangs on the lower end of the fixed magnetic pole plate. After careful inspection to ensure that it is firm, screw the lower end of the fifth part of the probe and the upper end of the fourth part of the probe. At this time, the probe has been fully assembled; The whole gas sample collection probe is tightened with the probe tube, and the penetration test can be started;

B. Gas sample collection: The shallow gas-bearing formation includes the surface cultivated soil layer, cover layer and gas-bearing layer from top to bottom. The groundwater level is located in the cover layer. Install the in-situ gas sample on the static penetrometer After the probe and the static penetration probe are collected, the static penetration probe is assembled from several sections of the probe tube, and starts to penetrate at a speed controlled at 1-2cm/s; when the predetermined gas-bearing layer is reached, the penetration is stopped. Input, change the magnetism of the fixed magnetic pole plate at the surface power supply, make the fixed magnetic pole plate and the movable magnetic pole plate have the same polarity, generate repulsive force between the fixed magnetic pole plate and the movable magnetic pole plate, adjust and increase the current to increase the repulsive force, when the magnetic pole of the same sex When the sum of the repulsive force between the plates and the elastic force generated by spring compression is greater than the tensile limit of the support rod, the support rod is pulled off, and the movable magnetic pole plate is separated from the fixed magnetic pole plate. The vacuum bottle moves downward, the second silicone plug at the lower part of the single-port aluminum vacuum bottle is inserted by the upper injection needle B of the double-ended injection needle B, and the lower injection needle B of the double-ended injection needle B is inserted into the upper end of the double-port aluminum vacuum bottle The upper silicone plug A, and press the double-ended aluminum vacuum bottle to move downward together, so that the lower silicone plug A at the lower end of the double-ended aluminum vacuum bottle is inserted by the upper injection needle A of the double-ended injection needle A, and the double-ended injection needle The lower injection needle A of A is inserted into the first silicone plug, and finally the single-port aluminum vacuum bottle, the double-ended injection needle B, the double-port aluminum vacuum bottle, and the double-ended injection needle A are sequentially connected with the probe lumen of the first part of the probe. The in-situ gas sample of the air-bearing layer can enter the double-mouthed aluminum vacuum bottle through the ring-shaped permeable stone, and the gas-water separation is completed in the double-mouthed aluminum vacuum bottle (gas is lighter than water, the gas is at the top, and the water is at the bottom) , under the vacuum suction of the single-port aluminum vacuum bottle, the pure in-situ gas sample is sucked into the single-port aluminum vacuum bottle through the double-headed injection needle B in the fourth part of the probe, and the operation time should last long enough to ensure the extraction When there are enough gas samples, the sampling time in clayey soil is controlled to be 60-180 minutes, and the sampling time in sandy soil is controlled to be 5-20 minutes;

C. Equipment recovery: When enough in-situ gas samples are collected in the predetermined gas-bearing layer, the magnetism of the fixed magnetic pole plate is changed by operating the power supply on the surface, so that the polarity of the fixed magnetic pole plate is opposite to that of the movable magnetic pole plate, and suction is generated, and the gain is adjusted. Large current to increase the suction force, so that the movable magnetic pole plate moves upwards under the action of the suction force in conjunction with the single-port aluminum vacuum, and the double-ended injection needle B will be blocked by the fixed shrapnel, so that the single-port aluminum vacuum bottle and the double-ended injection needle B are completed. Separate, under the seal of the second silica gel plug, ensure that the gas sample collected in the single-port aluminum vacuum bottle is not mixed with other impurities; Retrieve it. When the in-situ gas sample collection probe is recovered to the surface, quickly unscrew the fourth part of the probe and the fifth part of the probe, and remove the single-port aluminum vacuum bottle from the clamping sleeve at the lower end of the movable magnetic pole plate. The pure in-situ gas sample of the air-bearing layer collected in the single-mouth aluminum vacuum bottle can be tested and analyzed when it is brought back to the laboratory; all parts of the instrument are removed, collected and installed for the next in-situ test Reuse for gas sample collection.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) The utility model has the advantages of simple structure, easy to carry, etc., equipped with an ordinary static penetrometer, can obtain the in-situ gas sample in the predetermined gas-bearing layer.

(2) The utility model solves the problem that the existing technology lacks a simple in-situ gas sample collection device and other impurities are easily mixed in the gas sampling process in the current geotechnical engineering investigation in shallow gas-bearing geological areas.

Description of drawings

Fig. 1 is the structural representation of the in-situ gas sample collection probe of the utility model;

Fig. 2 is a schematic diagram of the installation and use of the in-situ gas sample collection probe of the present invention;

Fig. 3 is a structural schematic diagram of the first part of the probe;

Fig. 4 is the structural representation of the second part of the probe;

Fig. 5 is the structural representation of the third part of the probe;

Fig. 6 is the structural representation of the fourth part of the probe;

Fig. 7 is the structural representation of the fifth part of the probe;

Fig. 8 is a schematic diagram of a broken support rod between the fixed magnetic pole plate and the movable magnetic pole plate.

Wherein, the names corresponding to the reference signs in the accompanying drawings are:

10-static penetrometer, 20-surface cultivated soil layer, 30-cover layer, 40-gas-bearing layer, 50-in-situ gas sample collection probe, 60-ground water level, 70-static penetrating probe rod, 1-the first part of the probe, 11-ventilation hole, 12-annular permeable stone, 13-the first threaded pipe string, 14-the first silicone plug, 15-the probe lumen, 2-the second part of the probe, 21-double heads Injection needle A, 211 - upper injection needle A, 212 - lower injection needle A, 22 - sponge protection body A, 23 - second threaded pipe column, 3 - third part of probe, 31 - double-port aluminum vacuum bottle, 32 - lower silicone plug A, 33 - upper silicone plug A, 34 - the third threaded column, 4 - the fourth part of the probe, 41 - double-ended injection needle B, 411 - upper injection needle B, 412 - lower injection needle B, 42-sponge protection body B, 43-fixed shrapnel, 44-the fourth threaded pipe column, 5-the fifth part of the probe, 51-single-port aluminum vacuum bottle, 52-movable magnetic pole plate, 521-clip sleeve, 53-spring , 54-support rod, 55-fixed magnetic pole plate, 56-cable wire, 57-connection between magnetic pole plates, 58-second silica gel plug, 6-probing rod tube.

Detailed ways

Below in conjunction with embodiment the utility model is described in further detail:

Example

As shown in Figures 1 to 8, an in-situ gas sample collection probe used in shallow gas-bearing formations, the in-situ gas sample collection probe mainly consists of the first part 1 of the probe, the second part 2 of the probe, and the third part 3 of the probe , the fourth part 4 of the probe, and the fifth part 5 of the probe are sequentially airtightly connected from bottom to top. The first part 1 of the probe includes a probe tube A and an annular permeable stone 12 set outside the probe tube A. The probe tube A has a probe lumen 15 inside. The ventilation hole 11 , the air inlet end of the ventilation hole 11 is in corresponding contact with the inner wall of the annular permeable stone 12 . The second part 2 of the probe includes a probe tube B, and the inside of the probe tube B is filled with a sponge protection body A22, and a double-ended injection needle A21 is fixed inside the sponge protection body A22, and the double-ended injection needle A21 includes an upper injection needle A211 and a lower injection needle A212, The lower injection needle A212 corresponds to the first silicone plug 14 at the top of the probe lumen 15 in the first part 1 of the probe. The third part 3 of the probe includes a double-mouth aluminum vacuum bottle 31, the bottom bottle mouth of the double-mouth aluminum vacuum bottle 31 is sealed with a lower silicone plug A32 corresponding to the upper injection needle A211, and the top of the double-mouth aluminum vacuum bottle 31 is sealed. The upper part of the bottle is sealed with a silicone plug A33. The fourth part 4 of the probe includes a probe tube D, and the inside of the probe tube D is filled with a sponge protector B42, and a double-ended injection needle B41 is fixed inside the sponge protector B42, and the double-ended injection needle B41 includes an upper injection needle B411 and a lower injection needle B412, The lower injection needle B412 is corresponding to the upper silicone plug A33 at the top bottle mouth of the double-mouthed aluminum vacuum bottle 31 in the third part 3 of the probe. The fifth part 5 of the probe includes a probe tube E, a fixed magnetic pole plate 55 is fixed on the top of the lumen of the probe tube E, and a movable magnetic pole plate 52 is installed on the top of the lumen of the probe tube E, and the movable magnetic pole plate 52 is located below the fixed magnetic pole plate 55 , a spring 53 is connected between the movable magnetic pole plate 52 and the fixed magnetic pole plate 55, a single-port aluminum vacuum bottle 51 is installed in the lumen of the probe tube E, the bottom of the single-port aluminum vacuum bottle 51 is the bottle mouth, and the single-port aluminum vacuum bottle 51 The top is connected with the clip sleeve 521 at the bottom of the movable magnetic pole plate 52, and the second silica gel plug 58 is installed on the bottle mouth of the bottom of the single-port aluminum vacuum bottle 51. Silicone stopper 58 is corresponding. A cable 56 is connected to the top of the fixed magnetic pole plate 55 .

As shown in Figure 1 and Figure 6, a fixed shrapnel 43 is symmetrically fixed on the inner wall of the probe tube D of the fourth part 4 of the probe. When in use, press the double-ended injection needle B41 firmly, the two raised parts of the double-ended injection needle B41 can step over or pass through the fixed elastic piece 43, and the two raised parts of the double-ended injection needle B41 are snapped into the The two fixed elastic pieces 43 will not rebound (as shown in Figure 6).

The utility model also includes a probe tube 6 , and the cable 56 is arranged in the lumen of the probe tube 6 . The utility model also includes a static penetrating probe rod 70 and a static penetrating probe 10, the top of the static penetrating probe rod 70 is installed on the static penetrating probe 10, and the static penetrating probe rod 70 is composed of several sections of probe rods The tube 6 is assembled, and the bottom of the static penetration probe rod 70 is assembled with an in-situ gas sample collection probe 50 .

As shown in FIG. 7 and FIG. 8 , the preferred fixed magnetic pole plate 55 and the movable magnetic pole plate 52 of the present invention are also connected with a connecting line 57 between the magnetic pole plates.

As shown in FIG. 7 , a clamping sleeve 521 is fixed on the bottom of the movable magnetic pole plate 52 , and the top of the single-port aluminum vacuum bottle 51 is clamped into the clamping sleeve 521 . A supporting rod 54 is also connected between the fixed magnetic pole plate 55 and the movable magnetic pole plate 52 .

The preferred in-situ gas sample collection probe 50 of the present utility model is connected from bottom to top as follows: the top of the probe tube A of the first part 1 of the probe has a first threaded pipe column 13, and the bottom of the probe tube B of the second part 2 of the probe is connected to the first screw thread The pipe string 13 is threaded, and the top of the probe lumen 15 in the first threaded pipe string 13 is sealed with a first silica gel plug 14 . The top of the probe tube B of the second part 2 of the probe has a second threaded pipe column 23, the third part 3 of the probe includes a probe tube C, and a double-mouthed aluminum vacuum bottle 31 is fitted in the probe tube C, and the bottom of the probe tube C is connected to the second tube C. The threaded pipe string 23 is threadedly connected. The top of the probe tube C has a third threaded column 34, the top of the probe tube D of the fourth part 4 of the probe has a fourth threaded column 44, and the bottom of the probe tube D of the fourth part 4 of the probe is threadedly connected with the third threaded column 34, The bottom of the probe tube E of the fifth part 5 of the probe is threadedly connected with the fourth threaded column 44, and the single-port aluminum vacuum bottle 51 is fitted in the probe tube E

As shown in FIG. 3 , a conical probe cone is fixed at the bottom of the probe tube A of the first part 1 of the probe, and the probe cone is conducive to penetrating into the cultivated soil layer 20 , the cover layer 30 , and the gas-bearing layer 40 .

The preferred ventilation holes 11 of the utility model are circular, and the ventilation holes 11 are arranged in a circle along the tube wall of the probe tube A, and all the ventilation holes 11 are evenly stacked from the bottom of the tube wall of the probe tube A to the top of the tube wall.

As shown in Figures 1 to 8, an in-situ gas sample collection method for shallow gas-bearing formations includes an in-situ gas sample collection probe 50, and the collection method is as follows:

A. On-site device assembly: first assemble the first part 1 of the in-situ gas sample collection probe 50: vacuumize and saturate the ring-shaped permeable stone 12 of the first part 1 of the probe to remove the air therein, and then place the ring-shaped permeable stone 12 It is installed and fixed on the outside of the probe tube A of the first part 1 of the probe to ensure that the outer surface of the ring-shaped permeable stone 12 is smooth at the joint with the first part 1 of the probe, so that the inner wall of the ring-shaped permeable stone 12 and the ventilation hole 11 are closely fitted together to ensure the original position The gas sample can enter the vent hole 11 through the ring-shaped permeable stone 12 and then enter the probe lumen 15 of the first part 1 of the probe. Then assemble the second part 2 of the probe: tighten the thread between the bottom of the second part 2 of the probe and the top of the first part 1 of the probe, and then place the double-ended injection needle A21 wrapped by the sponge protection body A22 vertically on the second part 2 of the probe Inside of probe tube B. Then assemble the third part 3 of the probe, first put the double-mouthed aluminum vacuum bottle 31 vertically in the probe tube C of the third part 3 of the probe, then tighten the bottom of the third part 3 of the probe with the top of the second part 2 of the probe. Then assemble the fourth part 4 of the probe, screw the bottom of the fourth part 4 of the probe and the top of the third part 3 of the probe, and then place the double-ended injection needle B41 wrapped by the sponge protection body B42 vertically on the fourth part 4 of the probe. Inside of probe tube D. Finally, the fifth part 5 of the probe is assembled. Firstly, the cable 56 is pre-passed through the probe tube 6, and the single-port aluminum vacuum bottle 51 is tightly clamped on the clamp sleeve 521 at the lower end of the movable magnetic pole plate 52, and then the movable magnetic pole plate 52 is pushed upward. The magnetic pole plate 52 and the compression spring 53 make the support rod 54 hang on the lower end of the fixed magnetic pole plate 55. After careful inspection to ensure that it is firm, screw the lower end of the fifth part 5 of the probe and the upper end of the fourth part 4 of the probe. Now the probe has been fully assembled . Tighten the in-situ gas sample collection probe 50 and the probe rod tube 6 as a whole, and the penetration test can be started.

B. Gas sample collection: The formation includes the surface cultivated soil layer 20, the cover layer 30 and the gas-bearing layer 40 from top to bottom, and the groundwater level 60 is located at the cover layer 30. After the sample collection probe 50 and the static penetrating probe rod 70 are assembled, the static penetrating probe rod 70 is assembled from several probe rod tubes 6 and begins to penetrate at a speed controlled at 1-2 cm/s. Stop penetrating after reaching the predetermined gas-containing layer 40, change the magnetism of the fixed magnetic pole plate 55 at the surface power supply operation, make the fixed magnetic pole plate 55 and the movable magnetic pole plate 52 polarity identical, between the fixed magnetic pole plate 55 and the movable magnetic pole plate 52 Generate repulsion, adjust and increase the current to increase the repulsion, when the repulsion between the magnetic pole plates of the same sex and the elastic force generated by the compression of the spring 53 are greater than the tensile limit of the support rod 54, the support rod 54 is pulled off, and the movable magnetic pole plate 52 is separated from the fixed magnetic pole plate 55, and the movable magnetic pole plate 52 moves downward in coordination with the single-port aluminum vacuum bottle 51 under the action of elastic force and repulsion, and the second silica gel plug 58 at the bottom of the single-port aluminum vacuum bottle 51 is pressed by the double-ended injection needle B41. The upper injection needle B411 is inserted, and the lower injection needle B412 of the double-ended injection needle B41 is inserted into the upper silicone plug A33 on the upper end of the double-port aluminum vacuum bottle 31, and presses the double-port aluminum vacuum bottle 31 to move downward together, so that the double-port aluminum vacuum bottle 31 moves downward together. The lower silicone plug A32 at the lower end of the vacuum bottle 31 is inserted by the upper injection needle A211 of the double-ended injection needle A21, and the lower injection needle A212 of the double-ended injection needle A21 is inserted into the first silicone plug 14, and finally the single-port aluminum vacuum bottle 51, The double-ended injection needle B41, the double-ported aluminum vacuum bottle 31, and the double-ended injection needle A21 communicate with the probe lumen 15 of the first part 1 of the probe in sequence, and the in-situ gas and water samples of the predetermined gas-containing layer 40 can be passed through the ring. Permeable stone 12 enters in the double-port aluminum vacuum bottle 31, completes gas-water separation (gas is lighter than water, gas is at the top, and water is at the bottom) in the double-port aluminum vacuum bottle 31, in the single-port aluminum vacuum bottle 41 vacuum suction Under the action, the pure in-situ gas sample is sucked into the single-port aluminum vacuum bottle 41 through the double-headed injection needle B41 in the fourth part 4 of the probe. The operation time should last long enough to ensure that enough gas samples are taken. The sampling time in clayey soil is controlled at 60-180 minutes, and the sampling time in sandy soil is controlled at 5-20 minutes.

C. Equipment recovery: After sufficient in-situ gas samples are collected in the predetermined gas-bearing layer 40, the magnetism of the fixed magnetic pole plate 55 is changed by the surface power supply operation, so that the polarity of the fixed magnetic pole plate 55 is opposite to that of the movable magnetic pole plate 52, resulting in Suction, adjust and increase the current to increase the suction, so that the movable magnetic pole plate 52 moves upward in cooperation with the single-port aluminum vacuum 51 under the suction, and the double-headed injection needle B41 will be blocked by the fixed shrapnel 43, so that the single-port aluminum vacuum bottle 51 is separated from the double-ended injection needle B41, and under the seal of the second silica gel plug 58, it is ensured that the gas sample collected in the single-port aluminum vacuum bottle 51 is not mixed with other impurities. Then the probe pipe 6 of the static penetrating probe 70 is retrieved section by section by the static penetrating instrument 10, and when the in-situ gas sample collection probe 50 is recovered to the surface, the fourth part 4 of the probe and the probe The fifth part 5 is unscrewed, and the single-port aluminum vacuum bottle 51 is removed from the clamping sleeve 521 at the lower end of the movable magnetic pole plate 52. At this time, the collected pure gas-containing layer 40 is in the single-port aluminum vacuum bottle 51 The in-situ gas sample can be brought back to the laboratory for laboratory analysis. Disassemble the various parts of the instrument, collect and install them, so that they can be reused in the next in-situ gas sample collection.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation is popped one's head in, it is characterised in that: gas sample acquisition probe in situ is main By probe first part (1), probe second part (2), probe Part III (3), probe Part IV (4), probe the 5th Dividing (5), successively airtight connection forms from bottom to up；The probe first part (1) includes probe pipe A and is set in outside probe pipe A The cyclic annular permeable stone (12) in portion, the inside probe pipe A have probe lumen (15), and the tube wall of the probe pipe A is provided with several A ventilation holes (11) being connected with probe lumen (15), the inlet end of the ventilation holes (11) and cyclic annular permeable stone (12) The corresponding contact of inner wall；The probe second part (2) includes probe pipe B, is filled with sponge protective inside the probe pipe B A(22), the sponge protective A(22) internal it is fixed with double end injection needle A(21), the double end injection needle A(21) it include upper Portion injection needle A(211) and lower part injection needle A(212), the lower part injection needle A(212) it is corresponding with probe lumen (15)；Institute Stating probe Part III (3) includes twoport aluminium made vacuum bottle (31), close on the bottom bottleneck of the twoport aluminium made vacuum bottle (31) Close and lower part silica gel plug A(32 corresponding with top injection needle A(211) be installed), the top of the twoport aluminium made vacuum bottle (31) It is closed on portion's bottleneck that top silica gel plug A(33 is installed)；The probe Part IV (4) includes probe pipe D, the probe pipe D Inside is filled with sponge protective B(42), the sponge protective B(42) internal it is fixed with double end injection needle B(41), it is described double Head injection needle B(41) include top injection needle B(411) and lower part injection needle B(412), the lower part injection needle B(412) and it is double The top bottleneck of mouth aluminium made vacuum bottle (31) is corresponding；The probe Part V (5) includes probe pipe E, the probe pipe E's It is fixed with fixed magnetic pole plate (55) at the top of lumen, lifting is movably installed with detachable pole plate at the top of the lumen of the probe pipe E (52), the detachable pole plate (52) is located at below fixed magnetic pole plate (55), the detachable pole plate (52) and fixed magnetic pole plate (55) it is connected between spring (53), single port aluminium made vacuum bottle (51) is installed in the lumen of the probe pipe E, single port aluminum is true Empty bottle (51) bottom is bottleneck, is connect at the top of single port aluminium made vacuum bottle (51) with detachable pole plate (52), the single port aluminum is true It is closed on the bottleneck of empty bottle (51) bottom to be equipped with the second silica gel plug (58), the top injection needle B(411) it is true with single port aluminum The second silica gel plug (58) of empty bottle (51) bottom bottleneck is corresponding；Cable is connected at the top of the fixed magnetic pole plate (55) (56).

2. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 1 is popped one's head in, it is characterised in that: institute The probe pipe D inner wall bilateral symmetry for stating probe Part IV (4) is fixed with a fixation spring tab (43), the double end injection needle B (41) middle part outwardly convex has lug boss corresponding with two fixation spring tab (43).

3. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 1 is popped one's head in, it is characterised in that: also Including feeler lever pipe (6), the cable (56) is set in the lumen of feeler lever pipe (6).

4. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 1 is popped one's head in, it is characterised in that: institute State line (57) between being also connected with pole plate between fixed magnetic pole plate (55) and detachable pole plate (52).

5. popping one's head according to a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in claim 1 or 4, feature exists In: detachable pole plate (52) bottom is fixed with clamping set (521), cooperation clamping at the top of the single port aluminium made vacuum bottle (51) In clamping set (521)；Support rod (54) are also connected between the fixed magnetic pole plate (55) and detachable pole plate (52).

6. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 1 is popped one's head in, it is characterised in that: institute Stating has the first screw thread tubing string (13) at the top of the probe pipe A of probe first part (1), the probe of probe second part (2) The bottom pipe B is threadedly coupled with the first screw thread tubing string (13), closed in the tube cavity of the first screw thread tubing string (13) to be equipped with One silica gel plug (14)；There is the second screw thread tubing string (23), the probe the at the top of the probe pipe B of probe second part (2) Three parts (3) include probe pipe C, and the twoport aluminium made vacuum bottle (31) is coupled in probe pipe C, the bottom the probe pipe C Portion is threadedly coupled with the second screw thread tubing string (23)；There is third screw thread tubing string (34), the probe the 4th at the top of the probe pipe C Partially there is the 4th screw thread tubing string (44), the probe bottom pipe D of probe Part IV (4) and the at the top of the probe pipe D of (4) Three screw thread tubing strings (34) are threadedly coupled, the probe bottom pipe E of probe Part V (5) and the 4th screw thread tubing string (44) screw thread Connection, the single port aluminium made vacuum bottle (51) are coupled in probe pipe E.

7. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 1 is popped one's head in, it is characterised in that: institute The bottom probe pipe A for stating probe first part (1) is fixed with the probe cone of conical by its shape.

8. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 1 is popped one's head in, it is characterised in that: institute State that ventilation holes (11) are rounded, the ventilation holes (11) are circumferentially arranged along the tube wall of probe pipe A, all ventilation holes (11) it is uniformly stacked at the top of tube wall bottom to the tube wall of probe pipe A.

9. a kind of gas sample acquisition in situ for shallow-layer gas-bearing formation described in accordance with the claim 3 is popped one's head in, it is characterised in that: also Including static sounding feeler lever (70) and static penetrometer (10), static penetrometer is installed at the top of the static sounding feeler lever (70) (10) on, static sounding feeler lever (70) feeler lever pipe (6) as described in several sections assembles, static sounding feeler lever (70) bottom It is assembled with the gas sample acquisition probe (50) in situ.