Multi-aquifer multiphase fluid extraction sampling device and sampling method

Abstract

The present invention discloses a multi-aquifer multiphase fluid extraction sampling device and a sampling method, comprising a sampling tube (1), a back pressure tube (2), an air-filled fixed isolation component (3), a lifting component (4), an air-filling and air-exhausting component (5) and a segmented well (6); the segmented well is arranged in a stratum and communicated with an aquifer (7); the sampling tube is lowered to the position of the aquifer in the segmented well by the lifting component, and the sampling tube is fixed in the segmented well by the air-filled fixed isolation component and communicated with the segmented well; one end of the back pressure tube is arranged in the sampling tube, the air-filling and air-exhausting component is connected to the other end of the back pressure tube and the air-filled fixed isolation component, and the air-filling and air-exhausting component is arranged outside the segmented well; the sampling tube is a hollow tubular structure with closed top and bottom, and a plurality of independent chambers are formed in the sampling tube to collect fluid in phases. The present invention can meet the requirements of in-situ separation, independent collection and storage of multi-aquifer multiphase fluid.

Description

Technical Field

[0001] The invention relates to a groundwater sampling device and method, and in particular to a multi-aquifer multiphase fluid extraction sampling device and a sampling method. Background Art

[0002] Organic contaminated sites often face the problem of multi-phase underground fluids coexisting across multiple aquifers. Among them, non-aqueous phase liquids (NAPLs) such as gasoline, diesel, and organic solvents are often highly polluting and are the main source of groundwater pollution. In actual engineering, it is necessary to collect and store multi-phase liquids in a single aquifer separately. However, the existing segmented wells do not have the function of stratified collection, resulting in the mixing of liquids from multiple aquifers, making it difficult to sample a specific section. The sampling method of the prior art is to directly collect the underground mixed multi-phase liquid as a whole, and then separate and test it in the laboratory. The mixed multi-phase liquid is greatly disturbed during transportation, and there is a risk of leakage and secondary pollution of NAPL pollutants. Therefore, a multi-aquifer multi-phase fluid extraction sampling device and sampling method that can meet the needs of in-situ separation, collection and storage of multi-aquifer multi-phase fluids are required. Summary of the invention

[0003] The object of the present invention is to provide a multi-aquifer multiphase fluid extraction sampling device and sampling method, which can meet the requirements of in-situ separation, independent collection and storage of multi-aquifer multiphase fluid.

[0004] The present invention is achieved in that:

[0005] A multi-aquifer multiphase fluid extraction sampling device comprises a sampling tube, a back pressure tube, an air-filled fixed isolation assembly, a lifting assembly, an air-filled and air-filled assembly and a segmented well; the segmented well is arranged in a stratum, and the segmented well is communicated with the aquifer in the stratum; the air-filled and air-filled fixed isolation assembly is arranged on the outer wall of the sampling tube, the sampling tube is lowered into the segmented well through the lifting assembly and is located at the position of the aquifer to be sampled, the sampling tube is fixed in the segmented well through the air-filled and air-filled fixed isolation assembly and is communicated with the aquifer to be sampled; one end of the back pressure tube is arranged in the sampling tube, the air-filled and air-filled assembly is respectively connected to the other end of the back pressure tube and the air-filled and air-filled fixed isolation assembly, and the air-filled and air-filled assembly is arranged outside the segmented well; the sampling tube is a hollow tubular structure with closed top and bottom, and a plurality of independent chambers are formed in the sampling tube to collect fluid in phases.

[0006] The several independent chambers include a high-density fluid collection chamber, a low-density fluid collection chamber and a filter chamber; a first filter tube is provided in the filter chamber, and the filter chamber is divided into a filter area, a high-density fluid area and a low-density fluid area through the first filter tube, and the filter area is connected to the inside of the segmented well through the first filter tube; one end of the back pressure tube is connected to the filter chamber, and the other end of the back pressure tube is connected to the inflation and exhaust assembly.

[0007] A first one-way water inlet pipe is provided at the bottom of the high-density fluid collection chamber, and the lower end of the first one-way water inlet pipe extends into the high-density fluid area of ​​the filter chamber, so that the high-density fluid collection chamber is connected with the high-density fluid area of ​​the filter chamber; a first one-way exhaust valve is provided at the top of the high-density fluid collection chamber;

[0008] A first liquid extraction tube is provided in the high-density fluid collection chamber, one end of which is arranged on the top of the side wall of the high-density fluid collection chamber through a first valve, and the other end of the first liquid extraction tube is freely placed on the bottom of the high-density fluid collection chamber.

[0009] A second one-way water inlet pipe is provided at the bottom of the low-density fluid collection chamber, and the lower end of the second one-way water inlet pipe extends into the low-density fluid area of ​​the filter chamber, so that the low-density fluid collection chamber is connected with the low-density fluid area of ​​the filter chamber; a second one-way exhaust valve is provided at the top of the low-density fluid collection chamber;

[0010] A second liquid extraction tube is provided in the low-density fluid collection chamber, one end of which is arranged on the top of the side wall of the low-density fluid collection chamber through a second valve, and the other end of the second liquid extraction tube is freely placed on the bottom of the low-density fluid collection chamber.

[0011] The inflatable fixed isolation component includes an inflatable diaphragm sleeve and an inflatable tube; a plurality of inflatable diaphragm sleeves are respectively in annular structures and are sleeved on the outer wall of the sampling tube, and a plurality of inflatable diaphragm sleeves are respectively located at the top and bottom of the filter chamber; the inflatable tube is connected to the plurality of inflatable diaphragm sleeves, and an inflatable and exhaust end of the inflatable and exhaust component is connected to the inflatable tube, so that the inflatable diaphragm sleeve can be tightened and fixed between the inner wall of the segmented well and the outer wall of the sampling tube after being inflated through the inflatable and exhaust component through the inflatable and exhaust tube, so that the sampling tube is fixed in the segmented well, and the filter chamber is connected to the aquifer to be sampled.

[0012] The inflation and exhaust assembly includes an air pump, a second air pipe and a second diverter valve; one inflation and exhaust end of the air pump is connected to one end of the second air pipe through the second diverter valve, and the other end of the second air pipe is connected to the inflation pipe; the other inflation and exhaust end of the air pump is connected to the back pressure pipe.

[0013] The inflation and exhaust assembly also includes a first air pipe, a third air pipe, a first diverter valve and a waste liquid collector; the other inflation and exhaust end of the air pump is connected to one end of the first air pipe through the first diverter valve, and the other end of the first air pipe is connected to the waste liquid collector; one end of the third air pipe is connected to the waste liquid collector, and the other end of the third air pipe is connected to the back pressure pipe.

[0014] The segmented well comprises a second filter pipe and a closed well pipe. Several segments of the second filter pipe and several segments of the closed well pipe are coaxially connected to form a segmented well, so that the segmented well is connected to the aquifer and the first filter pipe through the second filter pipe, and the closed well pipe is located in the weakly permeable layer of the formation.

[0015] The lifting assembly comprises an elevator and a steel cable. A pull ring is provided on the top of the sampling tube. One end of the steel cable is connected to the pull ring, and the other end of the steel cable is connected to the driving end of the elevator.

[0016] A sampling method for a multi-aquifer multiphase fluid extraction sampling device, comprising the following steps:

[0017] Step 1: placing a segmented well in the formation, so that the segmented well is connected to the aquifer in the formation through the second filter pipe, and the weak permeable layer is separated from the segmented well by a closed well pipe;

[0018] Step 2: Deflating the inflatable fixed isolation component through the inflation and exhaust component to cause it to shrink;

[0019] Step 3: Place the sampling tube into the segmented well through the lifting assembly and lower it to the location of the aquifer to be sampled;

[0020] Step 4: Inflate the inflatable fixed isolation component through the inflatable and gas-filled component to expand it, and fix the sampling tube in the segmented well through the inflatable fixed isolation component, so that the underground multiphase fluid in one of the aquifers enters the sampling tube;

[0021] Step 5: extracting the underground multiphase fluid remaining in the sampling tube through the back pressure tube by the inflation / exhaust assembly;

[0022] Step 6: extracting the underground multiphase fluid in the sampling pipe into several chambers of the sampling pipe in phase separation;

[0023] Step 7: Deflating the inflatable fixed isolation component through the inflation and exhaust component to shrink it;

[0024] Step 8: Lift the sampling tube out of the segmented well using the lifting assembly;

[0025] Step 9: Extract the fluids in several chambers of the sampling tube respectively;

[0026] Step 10: Clean the sampling tube and repeat the above steps 1-9 to collect the underground multiphase liquid in the aquifer at different depths in layers.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Due to the sampling tube, the underground multiphase fluid can enter the filter chamber through the first filter tube, and separate high-density fluid and low-density fluid in the filter chamber. The high-density fluid enters and is stored in the high-density fluid collection chamber, and the low-density fluid enters and is stored in the low-density fluid collection chamber, thereby realizing the in-situ separation, collection and storage of underground multiphase fluids, avoiding the overall collection and transportation of underground multiphase fluids, and reducing the risk of NAPL pollutant leakage and secondary pollution.

[0029] 2. The present invention is provided with a back pressure pipe and an air filling and exhaust component. The air filling and exhaust component is used to inflate the filter chamber through the back pressure pipe, so that high-density fluid enters the high-density fluid collection chamber, and low-density fluid enters the low-density fluid collection chamber. This is beneficial to the separate collection and storage of the separated fluids, and the operation is convenient and quick.

[0030] 3. The present invention is provided with an inflatable fixed isolation component and a segmented well. According to the distribution of the aquifer and the weakly permeable layer, the segmented well is connected through the combination of the second filter tube and the closed well pipe to achieve stratified sampling of underground multiphase fluids in a single aquifer at different depths. At the same time, the inflatable fixed isolation component is used to block the flow of fluid at the top and bottom of the filter chamber to ensure accurate and effective sampling of underground multiphase fluids in a single aquifer at the sampling depth, thereby avoiding mixing of underground multiphase fluids in aquifers at different depths.

[0031] 4. The present invention integrates the sampling, separation and storage functions of underground multiphase fluids, and can sample underground multiphase fluids in multi-layer aquifers, which is beneficial to improving the efficiency of environmental exploration and detection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of a multi-aquifer multiphase fluid extraction sampling device of the present invention;

[0033] Figure 2 It is a schematic diagram of the implementation of the multi-aquifer multiphase fluid extraction sampling method of the present invention.

[0034] In the figure, 1 is a sampling tube, 11 is a partition, 12 is a high-density fluid collection chamber, 121 is a first one-way water inlet pipe, 122 is a first one-way exhaust valve, 123 is a first liquid extraction pipe, 124 is a first valve, 13 is a low-density fluid collection chamber, 131 is a second one-way water inlet pipe, 132 is a second one-way exhaust valve, 133 is a second liquid extraction pipe, 134 is a second valve, 14 is a filter chamber, 141 is a first filter tube, 15 is a pull ring, 2 is a back pressure tube, 3 is an inflatable fixed isolation component, 31 is an inflatable diaphragm sleeve, 32 is an inflatable tube, 4 is a lifting component, 41 is a lift, 42 is a steel cable, 5 is an inflatable and exhaust component, 51 is an air pump, 52 is a first air pipe, 53 is a second air pipe, 54 is a third air pipe, 55 is a first diverter valve, 56 is a second diverter valve, 57 is a waste liquid collector, 6 is a segmented well, 61 is a second filter tube, 62 is a closed well pipe, 7 is an aquifer, and 8 is a weakly permeable layer. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] Please see attached Figure 1 and attached Figure 2A multi-aquifer multiphase fluid extraction sampling device comprises a sampling tube 1, a back pressure tube 2, an air-filled fixed isolation assembly 3, a lifting assembly 4, an air-filled and air-filled assembly 5 and a segmented well 6; the segmented well 6 is arranged in the formation, and the segmented well 6 is connected with the aquifer 7 in the formation; the air-filled and air-filled fixed isolation assembly 3 is arranged on the outer wall of the sampling tube 1, the sampling tube 1 is lowered into the segmented well 6 through the lifting assembly 4 and is located at the position of the aquifer 7 to be sampled, the sampling tube 1 is fixed in the segmented well 6 through the air-filled and air-filled fixed isolation assembly 3 and is connected with the aquifer 7 to be sampled; one end of the back pressure tube 2 is arranged in the sampling tube 1, the air-filled and air-filled assembly 5 is respectively connected with the other end of the back pressure tube 2 and the air-filled and air-filled fixed isolation assembly 3, and the air-filled and air-filled assembly 5 is arranged outside the segmented well 6; the sampling tube 1 is a hollow tubular structure with closed top and bottom, and a plurality of independent chambers are formed in the sampling tube 1 through a partition 11 to collect fluid in phases.

[0037] The segmented well 6 is connected with the aquifer 7 so that the underground multiphase fluid in the aquifer 7 can enter the segmented well 6, so that after the sampling tube 1 is placed into the segmented well 6 through the lifting component 4 and fixed and isolated by the inflation fixing isolation component 3, the sampling tube 1 can sample the underground multiphase fluid in the aquifer 7 to be sampled, and separate the underground multiphase fluid in situ and store it in several independent chambers through the inflation and exhaust components 5 and the back pressure tube 2, so as to avoid the underground multiphase fluid in the multiple layers of the aquifer 7 from mixing together and being disturbed during transportation, thereby causing NAPL pollutant leakage or secondary pollution.

[0038] The several independent chambers include a high-density fluid collection chamber 12, a low-density fluid collection chamber 13 and a filter chamber 14; a first filter tube 141 is provided in the filter chamber 14, and the filter chamber 14 is divided into a filter area, a high-density fluid area and a low-density fluid area through the first filter tube 141, and the filter area is connected to the inside of the segmented well 6 through the first filter tube 141; one end of the back pressure tube 2 is connected to the filter chamber 14, and the other end of the back pressure tube 2 is connected to the inflation and exhaust assembly 5.

[0039] The high-density fluid area and the low-density fluid area are separated by the first filter tube 141 but are in liquid communication, that is, the underground multiphase fluid can freely pass through the first filter tube 141 into the filter area, and separate and flow into the high-density fluid area or the low-density fluid area under the filtration of the first filter tube 141. The high-density fluid enters the high-density fluid area, and the low-density fluid enters the low-density fluid area, thereby realizing the in-situ separation of the underground multiphase fluid.

[0040] The filter material in the first filter tube 141 can be selected according to the components of the underground multiphase fluid in the aquifer 7 to be sampled, so that high-density fluid and low-density fluid of different components can be separated in situ through the filter material while sampling.

[0041] A first one-way water inlet pipe 121 is provided at the bottom of the high-density fluid collection chamber 12, and the lower end of the first one-way water inlet pipe 121 extends into the high-density fluid area of ​​the filter chamber 14, so that the high-density fluid collection chamber 12 is connected with the high-density fluid area of ​​the filter chamber 14; a first one-way exhaust valve 122 is provided at the top of the high-density fluid collection chamber 12.

[0042] The high-density fluid in the high-density fluid area can enter the high-density fluid collection chamber 12 through the first one-way water inlet pipe 121. A one-way valve can be set on the first one-way water inlet pipe 121 to ensure that the high-density fluid flows into the high-density fluid collection chamber 12 without backflow, thereby achieving effective collection of the high-density fluid. When the high-density fluid enters the high-density fluid collection chamber 12, the air in the high-density fluid collection chamber 12 is discharged through the first one-way exhaust valve 122, ensuring that the high-density fluid collection chamber 12 is filled with high-density fluid, thereby ensuring the sampling volume.

[0043] A first liquid extraction tube 123 is provided in the high-density fluid collection chamber 12. One end of the first liquid extraction tube 123 is set on the top of the side wall of the high-density fluid collection chamber 12 through a first valve 124, and the other end of the first liquid extraction tube 123 is freely placed at the bottom of the high-density fluid collection chamber 12.

[0044] The first valve 124 is opened, and the first liquid extraction pipe 123 is externally connected to an extraction pump, so that the high-density fluid in the high-density fluid collection chamber 12 can be extracted, which is convenient for subsequent detection, testing and other operations.

[0045] A second one-way water inlet pipe 131 is provided at the bottom of the low-density fluid collection chamber 13, and the lower end of the second one-way water inlet pipe 131 extends into the low-density fluid area of ​​the filter chamber 14, so that the low-density fluid collection chamber 13 is connected with the low-density fluid area of ​​the filter chamber 14; a second one-way exhaust valve 132 is provided at the top of the low-density fluid collection chamber 13.

[0046] The low-density fluid in the low-density fluid area can enter the low-density fluid collection chamber 13 through the second one-way water inlet pipe 131. A one-way valve can be set on the second one-way water inlet pipe 131 to ensure that the low-density fluid flows into the low-density fluid collection chamber 13 without backflow, thereby achieving effective collection of the low-density fluid. When the low-density fluid enters the low-density fluid collection chamber 13, the air in the low-density fluid collection chamber 13 is discharged through the second one-way exhaust valve 132, ensuring that the low-density fluid collection chamber 13 is filled with low-density fluid, thereby ensuring the sampling volume.

[0047] A second liquid extraction tube 133 is provided in the low-density fluid collection chamber 13. One end of the second liquid extraction tube 133 is set on the top of the side wall of the low-density fluid collection chamber 13 through a second valve 134, and the other end of the second liquid extraction tube 133 is freely placed at the bottom of the low-density fluid collection chamber 13.

[0048] The second valve 134 is opened, and the second liquid extraction pipe 133 is externally connected to an extraction pump, so that the low-density fluid in the low-density fluid collection chamber 13 can be extracted, which is convenient for subsequent detection, testing and other operations.

[0049] The inflatable fixed isolation component 3 includes an inflatable diaphragm sleeve 31 and an inflatable tube 32; several inflatable diaphragm sleeves 31 are respectively annular in structure and are sleeved on the outer wall of the sampling tube 1, and several inflatable diaphragm sleeves 31 are respectively located at the top and bottom of the filter chamber 14; the inflatable tube 32 is connected to several inflatable diaphragm sleeves 31, and one inflatable and exhaust end of the inflatable and exhaust component 5 is connected to the inflatable tube 32, so that the inflatable diaphragm sleeve 31 can be inflated and fixed between the inner wall of the segmented well 6 and the outer wall of the sampling tube 1 through the inflatable and exhaust component 5 through the inflatable tube 32, so that the sampling tube 1 is fixed in the segmented well 6, and the filter chamber 14 is connected to the aquifer 7 to be sampled.

[0050] The number of inflatable diaphragm sleeves 31 can be set according to the length of the sampling tube 1 and the actual working conditions. The size of the inflatable diaphragm sleeve 31 can be selected according to the size of the sampling tube 1 and the inner diameter of the segmented well 6. Preferably, there are six inflatable diaphragm sleeves 31, and three inflatable diaphragm sleeves 31 are set at the top and bottom of the filter chamber 14 respectively.

[0051] When the inflatable and exhaust assembly 5 inflates the inflatable tube 32, the six inflatable diaphragm sleeves 31 are inflated and expanded and tightened between the inner wall of the segmented well 6 and the outer wall of the sampling tube 1, so that the sampling tube 1 is fixed in the segmented well 6, which is convenient for sampling underground multiphase fluid. When the inflatable and exhaust assembly 5 exhausts air through the inflatable tube 32, the air in the six inflatable diaphragm sleeves 31 is discharged, and the six inflatable diaphragm sleeves 31 are contracted and separated from the inner wall of the segmented well 6, and the sampling tube 1 can be placed in the segmented well 6 or taken out from the segmented well 6.

[0052] When the inflatable diaphragm sleeve 31 is inflated between the segmented well 6 and the sampling tube 1, it can block the flow of fluid in the segmented well 6, ensuring that the underground multiphase fluid in the aquifer 7 at the sampling depth enters the segmented well 6 through the first filter tube 141 and enters the filter chamber 14 of the sampling tube 1, thereby ensuring the accuracy and effectiveness of the sampled underground multiphase fluid without being interfered by other formation fluids.

[0053] The inflation and exhaust assembly 5 includes an air pump 51, a second air pipe 53 and a second diverter valve 56; one inflation and exhaust end of the air pump 51 is connected to one end of the second air pipe 53 through the second diverter valve 56, and the other end of the second air pipe 53 is connected to the inflation pipe 32; the other inflation and exhaust end of the air pump 51 is connected to the back pressure pipe 2.

[0054] The air pump 51 has the functions of inflation and deflation and can be switched flexibly. When the second diverter valve 56 is opened, the air pump 51 can inflate or exhaust the inflation tube 32 through the second air pipe 53, thereby achieving inflation expansion and deflation contraction of the inflatable diaphragm sleeve 31. During the sampling process, the second diverter valve 56 is closed to stop the inflation and deflation of the inflatable diaphragm sleeve 31.

[0055] The inflation and exhaust assembly 5 also includes a first air pipe 52, a third air pipe 54, a first diverter valve 55 and a waste liquid collector 57; the other inflation and exhaust end of the air pump 51 is connected to one end of the first air pipe 52 through the first diverter valve 55, and the other end of the first air pipe 52 is connected to the waste liquid collector 57; one end of the third air pipe 54 is connected to the waste liquid collector 57, and the other end of the third air pipe 54 is connected to the back pressure pipe 2.

[0056] When the first diverter valve 55 is opened, the air pump 51 can inflate the back pressure pipe 2 through the first air pipe 52, the waste liquid collector 57 and the third air pipe 54, so that the gas enters the filter chamber 14, and the air pressure in the filter chamber 14 increases. When the air pump 51 is closed, the waste liquid in the filter chamber 14 can be discharged into the waste liquid collector 57 through the third air pipe 54 by air pressure. The waste liquid collector 57 can adopt a closed box structure, which is only connected through the first air pipe 52 and the third air pipe 54, and is used to collect the underground multiphase fluid remaining in the filter chamber 14.

[0057] After the waste liquid in the filter chamber 14 is discharged, the sampling tube 1 is placed in the segmented well 6 to sample the underground multiphase fluid, the air pump 51 is turned on, and air is inflated into the filter chamber 14 through the back pressure tube 2, so that the high-density fluid enters the high-density fluid collection chamber 12 through the first one-way water inlet pipe 121, and the low-density fluid enters the low-density fluid collection chamber 13 through the second one-way water inlet pipe 131, thereby completing the in-situ separation and sampling of the underground multiphase fluid in a certain layer of aquifer 7.

[0058] The second diverter valve 56 and the first diverter valve 55 independently control two gas circuits to ensure the normal use of the inflatable fixed isolation assembly 3 and the back pressure pipe 2.

[0059] The segmented well 6 includes a second filter tube 61 and a closed well pipe 62. Several sections of the second filter tube 61 and several sections of the closed well pipe 62 are coaxially connected to form the segmented well 6, so that the segmented well 6 is connected with the aquifer 7 and the first filter tube 141 through the second filter tube 61, and the closed well pipe 62 is located at the weakly permeable layer 8 of the formation.

[0060] The underground multiphase fluid in the aquifer 7 to be sampled enters the segmented well 6 through the second filter tube 61, and enters the filter chamber 14 through the first filter tube 141, while the fluid in the weakly permeable layer 8 does not enter the segmented well 6. The geological conditions of the sampling area can be explored before sampling, and the length and number of sections of the second filter tube 61 and the closed well pipe 62 can be determined according to the distribution of the aquifer 7 and the weakly permeable layer 8 to ensure that the multiple layers of aquifer 7 are respectively connected to the multiple sections of the second filter tube 61, thereby ensuring reliable sampling of the underground multiphase fluid in one layer of the aquifer 7 by the present invention.

[0061] The lifting assembly 4 includes a lift 41 and a steel cable 42 . A pull ring 15 is provided on the top of the sampling tube 1 . One end of the steel cable 42 is connected to the pull ring 15 , and the other end of the steel cable 42 is connected to the driving end of the lift 41 .

[0062] Preferably, the elevator 41 can be a winch. The winch's control of lifting and lowering the steel cable 42 is a conventional function of the winch, which will not be described in detail here. After the winch is connected to an external power source, the steel cable 42 can be controlled to rise to achieve the lifting of the sampling tube 1, and the steel cable 42 can also be controlled to fall to achieve the lowering of the sampling tube 1. The setting of the pull ring 15 facilitates the reliable and convenient connection between the sampling tube 1 and the steel cable 42.

[0063] Please see attached Figure 1 and attached Figure 2 , a multi-aquifer multiphase fluid extraction sampling method, comprising the following steps:

[0064] Step 1: Place a segmented well 6 in the formation, connect the segmented well 6 with the aquifer 7 in the bottom layer through the second filter tube 61, and separate the weakly permeable layer 8 from the segmented well 6 through the sealed well pipe 62, ensuring that only the underground multiphase fluid in the aquifer 7 enters the segmented well 6 through the second filter tube 61.

[0065] Step 2: Deflating the inflatable fixed isolation component 3 through the inflation and exhaust component 5 to cause it to shrink.

[0066] Specifically, open the second diverter valve 56, connect the air pump 51 to the inflation pipe 32 of the inflatable fixed isolation assembly 3 through the second air pipe 53, and use the exhaust function of the air pump 51 to evacuate the air in each inflatable diaphragm sleeve 31 in the inflatable fixed isolation system 3 to shrink it. After the shrinkage is completed, close the second diverter valve 56.

[0067] Step 3: Place the sampling tube 1 into the segmented well 6 through the lifting assembly 4 and lower it to the location of the aquifer 7 to be sampled.

[0068] Specifically, the pull ring 15 of the sampling tube 1 is connected to the elevator 41 through the steel cable 42 and the sampling tube 1 is placed in the segmented well 6. The elevator 41 controls the length of the steel cable 42 to lower the sampling tube 1 to the location of the aquifer 7 to be sampled.

[0069] Step 4: Inflate the inflatable fixed isolation component 3 through the inflatable gas component 5 to make it expand. The sampling tube 1 is fixed in the segmented well 6 through the inflatable fixed isolation component 3, so that the underground multiphase fluid in one layer of the aquifer 7 enters the sampling tube 1.

[0070] Specifically, open the second diverter valve 56, connect the air pump 51 to the inflation pipe 32 of the inflatable fixed isolation system 3 through the second air pipe 53, use the inflation function of the air pump 51 to fill air into the inflatable diaphragm sleeve 31 through the inflation pipe 32 to expand it, and close the second diverter valve 56 when the inflatable diaphragm sleeve 31 is fully inflated and tightly fits against the inner wall of the segmented well 6.

[0071] Step 5: Extract the underground multiphase fluid remaining in the sampling tube 1 through the back pressure tube 2 using the inflation / exhaust assembly 5 .

[0072] Specifically, open the first diverter valve 55, so that the air pump 51 is connected to the back pressure pipe 2 through the first air pipe 52, the waste liquid collector 57 and the third air pipe 54 in sequence, and the exhaust function of the air pump 51 is used to draw the underground multiphase fluid remaining in the filter chamber 14 through the third air pipe 54 into the waste liquid collector 57.

[0073] The lower end of the back pressure tube 2 is located at the top of the filter chamber 14. In order to avoid affecting the collection of underground multiphase fluid, the residual underground multiphase fluid can also be extracted and discharged before the sampling tube 1 is placed in the segmented well 6.

[0074] Step 6: Extract the underground multiphase fluid in the sampling pipe 1 into several chambers of the sampling pipe 1 in phases.

[0075] Specifically, after the underground multiphase fluid remaining in the filter chamber 14 is completely extracted, compressed air is filled into the top of the filter chamber 14 by utilizing the inflation function of the air pump 51. Under the action of air pressure, the low-density fluid in the low-density fluid area of ​​the filter chamber 14 flows into the low-density fluid collection chamber 13 through the second one-way water inlet pipe 131, and the high-density fluid in the high-density fluid area of ​​the filter chamber 14 flows into the high-density fluid collection chamber 12 through the first one-way water inlet pipe 121. After the high-density fluid collection chamber 12 and the low-density fluid collection chamber 13 are filled with fluid, the first diverter valve 55 is closed.

[0076] Step 7: Deflating the inflatable fixed isolation component 3 through the inflation and exhaust component 5 causes it to shrink.

[0077] The method for shrinking the inflatable fixed isolation component 3 in step 7 is consistent with the method for shrinking the inflatable fixed isolation component 3 in step 2, and will not be repeated here.

[0078] Step 8: Lift the sampling tube 1 out of the segmented well 6 through the lifting assembly 4 .

[0079] Specifically, the length of the steel cable 42 is controlled by the elevator 41 , so that the sampling tube 1 is lifted to the wellhead of the segmented well 6 by the steel cable 42 .

[0080] Step 9: Extract the fluids in several chambers of the sampling tube 1 respectively.

[0081] Specifically, the first valve 124 is opened to extract the high-density fluid in the high-density fluid collection chamber 12 through the first extraction tube 123 , and the second valve 134 is opened to extract the low-density fluid in the low-density fluid collection chamber 13 through the second extraction tube 133 .

[0082] Step 10: Clean the sampling tube 1 and repeat the above steps 1-9 to collect the underground multiphase liquid in the aquifer 7 at different depths in layers.

[0083] The cleaning of the sampling tube 1 includes the cleaning of the high-density fluid collection chamber 12 and the low-density fluid collection chamber 13. If there is waste liquid in the waste liquid collector 57, it is also cleaned.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-aquifer multiphase fluid extraction sampling device, characterized in that: The invention comprises a sampling tube (1), a back pressure tube (2), an air-filled fixed isolation component (3), a lifting component (4), an air-filled and air-filled component (5) and a segmented well (6); the segmented well (6) is arranged in a stratum, and the segmented well (6) is connected to an aquifer (7) in the stratum; the air-filled and air-filled fixed isolation component (3) is arranged on the outer wall of the sampling tube (1); the sampling tube (1) is lowered into the segmented well (6) through the lifting component (4) and is located at the position of the aquifer (7) to be sampled; the sampling tube (1) is lowered into the segmented well (6) through the lifting component (4) and is located at the position of the aquifer (7) to be sampled; The gas-fixing isolation component (3) is fixed in the segmented well (6) and communicated with the aquifer (7) to be sampled; one end of the back-pressure tube (2) is arranged in the sampling tube (1); the gas-filling and gas-exhausting component (5) is respectively connected to the other end of the back-pressure tube (2) and the gas-filling and gas-fixing isolation component (3); the gas-filling and gas-exhausting component (5) is arranged outside the segmented well (6); the sampling tube (1) is a hollow tubular structure with closed top and bottom, and a plurality of independent chambers are formed in the sampling tube (1) to collect fluid in phases; The plurality of independent chambers include a high-density fluid collection chamber (12), a low-density fluid collection chamber (13) and a filter chamber (14); a first filter tube (141) is provided in the filter chamber (14); the filter chamber (14) is divided into a filter area, a high-density fluid area and a low-density fluid area through the first filter tube (141); the filter area is connected to the interior of the segmented well (6) through the first filter tube (141); one end of the back pressure tube (2) is connected to the filter chamber (14), and the other end of the back pressure tube (2) is connected to the inflation / exhaust assembly (5); A first one-way water inlet pipe (121) is provided at the bottom of the high-density fluid collection chamber (12), and the lower end of the first one-way water inlet pipe (121) extends into the high-density fluid region of the filter chamber (14), so that the high-density fluid collection chamber (12) is connected to the high-density fluid region of the filter chamber (14); a first one-way exhaust valve (122) is provided at the top of the high-density fluid collection chamber (12); A first liquid extraction tube (123) is provided in the high-density fluid collection chamber (12), one end of the first liquid extraction tube (123) is arranged on the top of the side wall of the high-density fluid collection chamber (12) through a first valve (124), and the other end of the first liquid extraction tube (123) is freely placed on the bottom of the high-density fluid collection chamber (12); The inflatable fixed isolation component (3) comprises an inflatable diaphragm sleeve (31) and an inflatable tube (32); the plurality of inflatable diaphragm sleeves (31) are respectively in annular structures and are sleeved on the outer wall of the sampling tube (1); the plurality of inflatable diaphragm sleeves (31) are respectively located at the top and the bottom of the filter chamber (14); the inflatable tube (32) is connected to the plurality of inflatable diaphragm sleeves (31); an inflatable and exhaust end of the inflatable and exhaust component (5) is connected to the inflatable tube (32), so that the inflatable diaphragm sleeve (31) can be inflated and fixed between the inner wall of the segmented well (6) and the outer wall of the sampling tube (1) through the inflatable and exhaust component (5) and the inflatable tube (32), so that the sampling tube (1) is fixed in the segmented well (6), and the filter chamber (14) is connected to the aquifer (7) to be sampled; The segmented well (6) comprises a second filter tube (61) and a sealed well tube (62), wherein a plurality of segments of the second filter tube (61) and a plurality of segments of the sealed well tube (62) are coaxially connected to form the segmented well (6), so that the segmented well (6) is connected to the aquifer (7) and the first filter tube (141) through the second filter tube (61), and the sealed well tube (62) is located at a weakly permeable layer (8) of the formation.

2. The multi-aquifer multiphase fluid extraction sampling device according to claim 1 is characterized in that: A second one-way water inlet pipe (131) is provided at the bottom of the low-density fluid collection chamber (13), and the lower end of the second one-way water inlet pipe (131) extends into the low-density fluid region of the filter chamber (14), so that the low-density fluid collection chamber (13) is connected to the low-density fluid region of the filter chamber (14); a second one-way exhaust valve (132) is provided at the top of the low-density fluid collection chamber (13); A second liquid extraction tube (133) is provided in the low-density fluid collection chamber (13). One end of the second liquid extraction tube (133) is arranged on the top of the side wall of the low-density fluid collection chamber (13) through a second valve (134), and the other end of the second liquid extraction tube (133) is freely placed on the bottom of the low-density fluid collection chamber (13).

3. The multi-aquifer multiphase fluid extraction sampling device according to claim 1 is characterized by: The inflation / exhaust assembly (5) comprises an air pump (51), a second air pipe (53) and a second diverter valve (56); one inflation / exhaust end of the air pump (51) is connected to one end of the second air pipe (53) via the second diverter valve (56), and the other end of the second air pipe (53) is connected to the inflation pipe (32); the other inflation / exhaust end of the air pump (51) is connected to the back pressure pipe (2).

4. The multi-aquifer multiphase fluid extraction sampling device according to claim 3 is characterized by: The inflation and exhaust assembly (5) further comprises a first air pipe (52), a third air pipe (54), a first diverter valve (55) and a waste liquid collector (57); the other inflation and exhaust end of the air pump (51) is connected to one end of the first air pipe (52) via the first diverter valve (55), and the other end of the first air pipe (52) is in communication with the waste liquid collector (57); one end of the third air pipe (54) is in communication with the waste liquid collector (57), and the other end of the third air pipe (54) is in communication with the back pressure pipe (2).

5. The multi-aquifer multiphase fluid extraction sampling device according to claim 1 is characterized by: The lifting assembly (4) comprises a lift (41) and a steel cable (42). A pull ring (15) is provided at the top of the sampling tube (1). One end of the steel cable (42) is connected to the pull ring (15), and the other end of the steel cable (42) is connected to the driving end of the lift (41).

6. A sampling method for the multi-aquifer multiphase fluid extraction sampling device according to claim 1, characterized in that: The following steps are involved: Step 1: a segmented well (6) is placed in the formation, so that the segmented well (6) is connected to the aquifer (7) in the formation through a second filter tube (61), and the weakly permeable layer (8) is separated from the segmented well (6) by a sealed well tube (62); Step 2: Deflating the inflatable fixed isolation component (3) through the inflation and exhaust component (5) to cause it to shrink; Step 3: Place the sampling tube (1) into the segmented well (6) through the lifting assembly (4), and lower it to the location of the aquifer (7) to be sampled; Step 4: Inflate the inflatable fixed isolation component (3) through the inflatable gas component (5) to expand it, and fix the sampling tube (1) in the segmented well (6) through the inflatable fixed isolation component (3), so that the underground multiphase fluid in one of the aquifers (7) enters the sampling tube (1); Step 5: extracting the underground multiphase fluid remaining in the sampling tube (1) through the back pressure tube (2) by means of the inflation / exhaust assembly (5); Step 6: extracting the underground multiphase fluid in the sampling tube (1) into a plurality of chambers of the sampling tube (1) in phase separation; Step 7: Deflating the inflatable fixed isolation component (3) through the inflation and exhaust component (5) to cause it to shrink; Step 8: Lift the sampling tube (1) out of the segmented well (6) using the lifting assembly (4); Step 9: Extracting the fluids in the plurality of chambers of the sampling tube (1) respectively; Step 10: Clean the sampling tube (1) and repeat the above steps 1-9 to collect the underground multiphase liquid in the aquifer (7) at different depths in layers.

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