CN114427992A - Device and method for extracting gas in soil - Google Patents
Device and method for extracting gas in soil Download PDFInfo
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- CN114427992A CN114427992A CN202011064195.8A CN202011064195A CN114427992A CN 114427992 A CN114427992 A CN 114427992A CN 202011064195 A CN202011064195 A CN 202011064195A CN 114427992 A CN114427992 A CN 114427992A
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- 239000002689 soil Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 105
- 238000007789 sealing Methods 0.000 claims abstract description 76
- 239000007789 gas Substances 0.000 claims abstract description 63
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000003756 stirring Methods 0.000 claims abstract description 49
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 30
- 239000011435 rock Substances 0.000 claims abstract description 27
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 239000002680 soil gas Substances 0.000 claims abstract description 13
- 238000011065 in-situ storage Methods 0.000 claims abstract description 10
- 229920001971 elastomer Polymers 0.000 claims description 41
- 230000001681 protective effect Effects 0.000 claims description 16
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 239000012266 salt solution Substances 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 86
- 230000009286 beneficial effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 125000001183 hydrocarbyl group Chemical group 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Soil Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides an in-soil gas extraction device and a method, wherein the in-soil gas extraction device comprises a tank body, a temperature regulation layer and a vacuum layer which are sequentially stacked from inside to outside, one side of the tank body is provided with an opening and can be in threaded sealing connection with a sealing cover, a stirring device is arranged inside the tank body and used for stirring soil or rock soil samples placed in the tank body, the temperature regulation layer is arranged in a hollow mode and used for regulating the temperature in the tank body by injecting liquid nitrogen or hot liquid into the temperature regulation layer, and the vacuum layer is used for preserving heat of the temperature regulation layer. The invention can reduce the loss of gas components in the soil or rock soil sample extracted in situ, reduce errors, obtain real and effective data parameters of a target area and provide assistance for oil-gas geochemical exploration of the target area.
Description
Technical Field
The invention relates to the field of near-surface oil and gas geochemical exploration, in particular to an extraction device and method for gases in soil.
Background
The underlying theory of oil and gas geochemical exploration suggests that hydrocarbons in subterranean reservoirs may leak approximately vertically into the surface soil. In the soil near the surface above the oil and gas reservoir, due to the addition of the vertical micro-seepage hydrocarbon, hydrocarbon abnormity which is higher than the hydrocarbon concentration of the background at the periphery of the oil and gas reservoir is formed. The use of the anomaly signature left by the migrating hydrocarbons at the surface allows the prediction of the hydrocarbon bearing prospect in the subsurface. However, with the development of the technology level, the exploration workers are not limited to hydrocarbon gas, and the oilfield associated gas also plays a positive role in oil and gas exploration.
Most of the gases are easy to move to the earth surface and adsorb in the gaps of the soil surface due to the small molecular weight and light weight, and how to extract the gases in the soil to the maximum is a problem which is concerned to be solved in recent years. At present, free gas is mainly drilled to a certain depth below the ground surface, and is extracted from a specific pipeline in a drilling tool, so that the underground free gas is obtained and detected. The gas in the adsorbed state is currently mainly obtained by methods such as saturated saline soaking and negative pressure desorption, and these methods are various.
The invention designs the device and the method for extracting the gas in the soil, which can reduce the loss of the gas components in the soil or rock soil sample extracted in situ, reduce errors, obtain real and effective data parameters of a target area and provide assistance for oil-gas geochemical exploration of the target area.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the device and the method for extracting the gas in the soil, which can reduce the loss of the gas components in the soil or rock soil sample extracted in situ, reduce errors, obtain real and effective data parameters of a target area and provide assistance for oil-gas geochemical exploration of the target area.
In a first aspect, the invention provides an extraction device for gas in soil, which comprises a tank body, a temperature regulation layer and a vacuum layer which are sequentially stacked from inside to outside;
the device comprises a tank body, a sealing cover, a stirring device and a stirring device, wherein an opening is formed in one side of the tank body, the tank body can be in threaded sealing connection with the sealing cover, and the stirring device is arranged in the tank body and used for stirring soil or rock samples placed in the tank body;
the temperature adjusting layer is arranged in a hollow manner and used for adjusting the temperature in the tank body by injecting liquid nitrogen or hot liquid into the temperature adjusting layer;
wherein the vacuum layer is used for heat preservation of the temperature adjusting layer.
In one embodiment, the vacuum device further comprises an elastic protection layer which is arranged outside the vacuum layer and used for protecting the vacuum layer.
The beneficial effects of adopting the above embodiment are: and the elastic protection layer is arranged for protecting the vacuum layer.
In one embodiment, the stirring device comprises a driving motor, a rotating rod and a stirring tool bit, wherein the driving motor is arranged on the outer side of the tank body, one end of the rotating rod is connected with the driving end of the driving motor, the other end of the rotating rod penetrates through the tank body, and the stirring tool bit is arranged on the rotating rod in the tank body and used for executing rotating action under the driving of the driving motor.
The beneficial effects of adopting the above embodiment are: the driving motor drives the stirring tool bit to rotate, and the soil or rock soil sample placed in the tank body is crushed and stirred, so that gas in the soil or rock soil sample escapes.
In one embodiment, the tank further comprises a protective cover which is in threaded connection with the tank body, and the protective cover completely wraps the driving motor for protecting the driving motor.
The beneficial effects of adopting the above embodiment are: and the protective cover is used for protecting the driving motor.
In one embodiment, the sealing cover is provided with at least one threaded through hole penetrating through the sealing cover, and the threaded through hole is in threaded sealing connection with the plug body;
the plug body is made of rubber or the middle part of the plug body is made of rubber, and the plug body is used for enabling an extraction device to penetrate through the plug body to extract gas.
The beneficial effects of adopting the above embodiment are: the cock body of rubber material, syringe needle, draw-out device syringe needle and the play needle of being convenient for etc. stretch into a jar internal portion after passing the cock body, and the condition of gas leakage can not appear after the syringe needle inserts.
In one embodiment, the device further comprises a temperature measuring device, wherein a measuring end of the temperature measuring device penetrates through the tank body and is used for measuring the temperature in the tank body.
The beneficial effects of adopting the above embodiment are: and the temperature measuring device is used for measuring the temperature in the tank body.
In one embodiment, the inner side wall of the tank body is provided with a scale for measuring the amount of the soil or rock sample put into the tank body.
The beneficial effects of adopting the above embodiment are: the setting of scale on the internal side wall of jar for measure the volume of putting into jar internal soil or rock soil sample.
In one embodiment, be provided with on the temperature regulation layer respectively with the inside inlet and the liquid outlet that communicate in temperature regulation layer, the inlet with all be provided with on the liquid outlet with inlet with liquid outlet interference fit's rubber buffer.
The beneficial effects of adopting the above embodiment are: the setting of inlet is used for pouring into liquid nitrogen or hydrothermal solution into in the temperature regulation layer, and the setting of liquid outlet is used for the discharge of liquid nitrogen or hydrothermal solution, and the setting of rubber buffer is used for the sealed of inlet and liquid outlet, and sealing performance is good.
In one embodiment, a rubber gasket is arranged in the sealing cover and is used for abutting against the opening edge of the tank body after the sealing cover is screwed tightly so as to realize the sealing between the sealing cover and the tank body.
The beneficial effects of adopting the above embodiment are: the arrangement of the rubber gasket ensures the sealing performance between the sealing cover and the tank body.
In a second aspect, the invention further provides an extraction method of the gas in the soil, which is suitable for the extraction device of the gas in the soil, and comprises the following steps:
quantitatively adding the soil or rock soil sample collected in situ into the tank body, injecting saturated salt solution, and screwing the sealing cover;
penetrating through the plug body on the sealing cover, continuously injecting saturated salt solution into the tank body, and emptying the air in the tank body;
opening a liquid inlet on the temperature adjusting layer, and injecting a preset amount of liquid nitrogen;
after the liquid is moved to the designated position, opening the liquid inlet and/or the liquid outlet, and naturally volatilizing the liquid nitrogen or exhausting the liquid nitrogen;
injecting hot liquid into the temperature adjusting layer, and standing for a first preset time to enable the temperature in the tank body to reach a preset temperature;
starting a stirring device, stirring the soil or rock soil sample in the tank body, stopping stirring after a second preset time, and standing for a third preset time;
and (3) passing through the plug body on the sealing cover, extracting quantitative gas, and measuring the gas components and content of the chromatograph and chromatograph-mass spectrometer.
Compared with the prior art, the invention has the advantages that:
(1) the loss of gas components in soil or rock soil samples extracted in situ can be reduced, errors are reduced, real and effective data parameters of a target area are obtained, and the method is assisted for oil-gas geochemical exploration of the target area.
(2) The method can maximize the in-situ extraction of the gas in the soil, thereby obtaining more accurate gas concentration and being more beneficial to carrying out abnormal identification on unknown areas.
(3) The gas in the soil or rock soil sample is released by crushing and stirring the soil or rock soil sample put into the tank body.
(4) The temperature adjusting layer is arranged, so that the temperature in the tank body can be adjusted conveniently, the temperature in the tank body is reduced by injecting liquid nitrogen, the loss and escape of gas in the in-situ soil obtained in the field can be prevented to the greatest extent, the temperature in the tank body is improved by adding hot liquid, and the escape of gas in broken soil or rock soil samples is accelerated.
(5) The vacuum layer effectively slows down the loss of heat such as liquid nitrogen or hydrothermal solution in the temperature adjusting layer and is used for heat preservation of the temperature adjusting layer.
The technical features mentioned above can be combined in various suitable ways or replaced by equivalent technical features as long as the object of the invention is achieved.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 shows a top view of an in-soil gas extraction device;
FIG. 2 shows a side cut view of an in-soil gas extraction device;
FIG. 3 shows a schematic view of the seal cap;
FIG. 4 shows a flow diagram of a method for extraction of gases from the soil;
in the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
10-an in-soil gas extraction device; 11-a tank body; 13-a temperature regulating layer; 131-a liquid inlet; 15-vacuum layer; 17-a sealing cover; 19-a stirring device; 191-rotating rod; 193-stirring cutter head; 21-plug body.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
Example 1:
as shown in fig. 1 to 3, an extraction device 10 for gas in soil comprises a tank 11, a temperature adjusting layer 13 and a vacuum layer 15 which are sequentially stacked from inside to outside.
The tank body 11 is provided with an opening at one side and can be in threaded sealing connection with the sealing cover 17, the stirring device 19 is arranged in the tank body 11, the stirring device 19 is used for stirring soil or rock soil samples placed in the tank body 11, the temperature adjusting layer 13 is arranged in a hollow mode and used for adjusting the temperature in the tank body 11 by injecting liquid nitrogen or hot liquid into the temperature adjusting layer 13, and the vacuum layer 15 is used for heat preservation of the temperature adjusting layer 13.
Specifically, in this embodiment, the tank body 11 is a stainless steel circular tank with an open top, the open top of the tank body 11 protrudes outward by 3 to 4 centimeters, an external thread is disposed on an outer side wall of the protruding portion, an internal thread matched with the external thread at the opening of the tank body 11 and in threaded connection is disposed on an inner side wall of the sealing cover 17, and the sealing cover 17 can be in threaded sealing connection with the tank body 11 through rotation.
The outer side wall of the tank body 11 is sleeved with a temperature adjusting layer 13, the temperature adjusting layer 13 is made of stainless steel, the temperature adjusting layer is arranged in a hollow mode, and liquid nitrogen or hot liquid is injected into the temperature adjusting layer 13 to adjust the temperature in the tank body 11. Wherein, the cross section of the temperature adjusting layer 13 is a ring structure, and the distance between the outer ring and the inner ring is about 2-4 cm.
The cover is equipped with vacuum layer 15 on the lateral wall of temperature regulation layer 13, and the inside cavity of vacuum layer 15 sets up and vacuum pumping handles, and vacuum layer 15 can effectively slow down scattering and disappearing of heat such as liquid nitrogen or hydrothermal solution in temperature regulation layer 13 for temperature regulation layer 13's heat preservation.
Wherein, agitating unit 19 includes driving motor, rotary rod 191 and stirring tool bit 193, and driving motor sets up in the outside of jar body 11, and the one end of rotary rod 191 is connected with driving motor's drive end, and the other end wears to establish inside jar body 11, and stirring tool bit 193 sets up on being located jar internal rotary rod 191 of 11 for carry out the rotation action under driving motor's drive.
Specifically, in this embodiment, a driving motor is disposed at the outer side of the bottom of the tank 11, one end of the rotating rod 191 is connected to the driving end of the driving motor, and the other end of the rotating rod passes through the middle position of the bottom of the tank 11 and extends into the tank 11.
The rotating rod 191 is rotatably connected with the bottom of the tank body 11 through a sealing bearing, so that the sealing between the rotating rod 191 and the bottom of the tank body 11 is ensured, and the liquid or gas in the tank body 11 can be prevented from leaking.
In this embodiment, the rotating rod 191 may be a quadrangular rod, or may be a round rod or a polygonal rod (the number of edges of the polygonal rod is not limited).
The stirring bit 193 is provided on a rotating rod 191 inside the can 11 for performing a rotating motion by the driving of a driving motor.
In this embodiment, the stirring blade 193 is made of stainless steel, and the stirring blade 193 may have a cross-shaped structure or a m-shaped structure (the shape of the blade is not limited).
The device 10 for extracting the gas in the soil further comprises a protective cover, the protective cover is in threaded connection with the tank body 11, and the protective cover completely wraps the driving motor and is used for protecting the driving motor.
Specifically, in this embodiment, the bottom edge of the tank body 11 protrudes outward by a certain distance (determined by the size of the driving motor), the driving motor is located in an area surrounded by the protruding portion at the bottom edge of the tank body 11, an external thread is provided on the outer side wall of the protruding portion at the bottom edge of the tank body 11, an internal thread matched with the outer side wall of the protruding portion at the bottom edge of the tank body 11 is provided on the inner side wall of the protective cover, and the protective cover can be in threaded connection with the protruding portion at the bottom edge of the tank body 11 in a matched manner.
Wherein, be provided with at least one screw thread through-hole that runs through sealed lid 17 on the sealed lid 17, screw thread through-hole and cock body 21 thread sealing connection, cock body 21 adopts the rubber material to make or the mid portion of cock body 21 adopts the rubber material to make for convenient draw-out device passes the cock body and carries out gaseous extraction.
Specifically, in the present embodiment, a threaded through hole penetrating the sealing cap 17 is provided at a middle position of the sealing cap 17, and an edge of the threaded through hole is slightly higher than an outer side surface of the sealing cap 17, and a diameter of the threaded through hole is about 1 cm.
The outer side wall of the plug body 21 is provided with an external thread which is matched with the internal thread on the threaded through hole in a threaded manner, and the plug body 21 can be connected with the threaded through hole in a threaded manner in a threaded sealing manner.
The cock body 21 adopts the polytetrafluoroethylene material to make, and the mid portion is the rubber pad, and the rubber pad is convenient for stretch into jar internal portion behind syringe needle, draw-out device syringe needle and the gas outlet needle head etc. pass the rubber pad, and the condition of gas leakage can not appear after the syringe needle inserts.
Wherein, be provided with respectively on the temperature regulation layer 13 with the inside inlet 131 and the liquid outlet of communicating of temperature regulation layer 13, all be provided with on inlet 131 and the liquid outlet with inlet 131 and liquid outlet interference fit's rubber buffer.
Specifically, in this embodiment, the entire temperature adjustment layer 13 is a sealed structure, a liquid inlet 131 communicated with the inside of the temperature adjustment layer 13 is disposed at the upper portion of the temperature adjustment layer 13, and liquid nitrogen or hot liquid can be injected into the inside of the temperature adjustment layer 13 through the liquid inlet 131 to adjust the temperature inside the tank 11.
A liquid outlet communicated with the inside of the temperature adjusting layer 13 is formed in the lower portion of the temperature adjusting layer 13, and liquid nitrogen or hot liquid can be discharged out of the temperature adjusting layer 13 through the liquid outlet, wherein the liquid nitrogen can be directly volatilized from the opened liquid inlet 131 in a state that the liquid outlet is sealed.
All be provided with on inlet 131 and the liquid outlet with inlet 131 and liquid outlet interference fit's rubber buffer, the rubber buffer is used for the sealed of inlet 131 and liquid outlet, and sealing performance is good.
In this embodiment, the rubber buffer can directly be plugged into inlet 131 or liquid outlet under the effect of external force to realize the sealed of inlet 131 or liquid outlet.
Wherein, be provided with the rubber packing ring in the sealed lid 17 for after sealed lid 17 screws, offset with the opening border of jar body 11 to realize sealed between sealed lid 17 and the jar body 11.
Specifically, in this embodiment, a groove surrounding the inner side wall of the sealing cover 17 for one circle is formed in the inner side wall of the sealing cover 17, the rubber gasket is accommodated in the groove and protrudes out of the groove, and after the sealing cover 17 is screwed, the rubber gasket abuts against the opening edge of the tank body 11, so that the sealing performance between the sealing cover 17 and the tank body 11 is ensured.
Wherein, the inner side wall of the tank body 11 is provided with scales for measuring the amount of the soil or rock sample put into the tank body 11.
Example 2:
an extraction device 10 for gas in soil comprises a tank body 11, a temperature adjusting layer 13, a vacuum layer 15 and an elastic protective layer which are sequentially stacked from inside to outside.
The tank body 11 is provided with an opening at one side and can be in threaded sealing connection with the sealing cover 17, the tank body 11 is internally provided with a stirring device 19, the stirring device 19 is used for stirring soil or rock soil samples placed in the tank body 11, the temperature adjusting layer 13 is arranged in a hollow mode and used for adjusting the temperature in the tank body 11 by injecting liquid nitrogen or hot liquid into the temperature adjusting layer 13, the vacuum layer 15 is used for heat preservation of the temperature adjusting layer 13, and the elastic protection layer is arranged on the outer side of the vacuum layer 15 and used for protection of the vacuum layer 15.
Specifically, in this embodiment, the tank body 11 is a stainless steel circular tank with an open top, the open top of the tank body 11 protrudes outward by 3 to 4 centimeters, an external thread is disposed on an outer side wall of the protruding portion, an internal thread matched with the external thread at the opening of the tank body 11 and in threaded connection is disposed on an inner side wall of the sealing cover 17, and the sealing cover 17 can be in threaded sealing connection with the tank body 11 through rotation.
The outer side wall of the tank body 11 is sleeved with a temperature adjusting layer 13, the temperature adjusting layer 13 is made of stainless steel, the temperature adjusting layer is arranged in a hollow mode, and liquid nitrogen or hot liquid is injected into the temperature adjusting layer 13 to adjust the temperature in the tank body 11. Wherein, the cross section of the temperature adjusting layer 13 is a ring structure, and the distance between the outer ring and the inner ring is about 2-4 cm.
The cover is equipped with vacuum layer 15 on the lateral wall of temperature regulation layer 13, and the inside cavity of vacuum layer 15 sets up and vacuum pumping handles, and vacuum layer 15 can effectively slow down scattering and disappearing of heat such as liquid nitrogen or hydrothermal solution in temperature regulation layer 13 for temperature regulation layer 13's heat preservation.
The cover is equipped with the elasticity protective layer on the lateral wall of vacuum layer 15, and the elasticity protective layer can adopt the rubber material to make, also can adopt soft materials such as leather to make for protect vacuum layer 15, avoid colliding with or striking and lead to the damaged, air admission in vacuum layer 15 surface.
Wherein, agitating unit 19 includes driving motor, rotary rod 191 and stirring tool bit 193, and driving motor sets up in the outside of jar body 11, and the one end of rotary rod 191 is connected with driving motor's drive end, and the other end wears to establish inside jar body 11, and stirring tool bit 193 sets up on being located jar internal rotary rod 191 of 11 for carry out the rotation action under driving motor's drive.
Specifically, in this embodiment, a driving motor is disposed at the outer side of the bottom of the tank 11, one end of the rotating rod 191 is connected to the driving end of the driving motor, and the other end of the rotating rod passes through the middle position of the bottom of the tank 11 and extends into the tank 11.
The rotating rod 191 is rotatably connected with the bottom of the tank body 11 through a sealing bearing, so that the sealing between the rotating rod 191 and the bottom of the tank body 11 is ensured, and the liquid or gas in the tank body 11 can be prevented from leaking.
In this embodiment, the rotating rod 191 may be a quadrangular rod, or may be a round rod or a polygonal rod (the number of edges of the polygonal rod is not limited).
The stirring bit 193 is provided on a rotating rod 191 inside the can 11 for performing a rotating motion by the driving of a driving motor.
In this embodiment, the stirring blade 193 is made of stainless steel, and the stirring blade 193 may have a cross-shaped structure or a m-shaped structure (the shape of the blade is not limited).
The device 10 for extracting the gas in the soil further comprises a protective cover, the protective cover is in threaded connection with the tank body 11, and the protective cover completely wraps the driving motor and is used for protecting the driving motor.
Specifically, in this embodiment, the bottom edge of the tank body 11 protrudes outward by a certain distance (determined by the size of the driving motor), the driving motor is located in an area surrounded by the protruding portion at the bottom edge of the tank body 11, an external thread is provided on the outer side wall of the protruding portion at the bottom edge of the tank body 11, an internal thread matched with the outer side wall of the protruding portion at the bottom edge of the tank body 11 is provided on the inner side wall of the protective cover, and the protective cover can be in threaded connection with the protruding portion at the bottom edge of the tank body 11 in a matched manner.
Wherein, be provided with at least one screw thread through-hole that runs through sealed lid 17 on the sealed lid 17, screw thread through-hole and cock body 21 thread sealing connection, cock body 21 adopts the rubber material to make or the mid portion of cock body 21 adopts the rubber material to make for convenient draw-out device passes the cock body and carries out gaseous extraction.
Specifically, in this embodiment, a threaded through hole penetrating through the sealing cover 17 is respectively formed in the middle of the sealing cover 17, and a threaded through hole penetrating through the sealing cover 17 is formed in the edge of the sealing cover 17, the threaded through holes have the same size, the edges of the threaded through holes are slightly higher than the outer side surface of the sealing cover 17, and the diameter of the threaded through hole is about 1 cm.
The outer side wall of the plug body 21 is provided with an external thread which is matched with the internal thread on the thread through hole and is in threaded connection with the internal thread, and the two plug bodies 21 can be in threaded sealing connection with the two thread through holes respectively.
The cock body 21 adopts the polytetrafluoroethylene material to make, and the mid portion is the rubber pad, and the rubber pad is convenient for stretch into jar internal portion behind syringe needle, draw-out device syringe needle and the gas outlet needle head etc. pass the rubber pad, and the condition of gas leakage can not appear after the syringe needle inserts.
The arrangement of two cock bodies 21 (or a plurality of cock bodies 21) can satisfy and pass rubber pads on different cock bodies 21 with syringe needle, draw-out device syringe needle and gas outlet needle etc. respectively, can not cause the crowded on same cock body 21 of syringe needle, draw-out device syringe needle and gas outlet needle etc. and design more rationally.
Wherein, be provided with respectively on the temperature regulation layer 13 with the inside inlet 131 and the liquid outlet of communicating of temperature regulation layer 13, all be provided with on inlet 131 and the liquid outlet with inlet 131 and liquid outlet interference fit's rubber buffer.
Specifically, in this embodiment, the entire temperature adjustment layer 13 is a sealed structure, a liquid inlet 131 communicated with the inside of the temperature adjustment layer 13 is disposed at the upper portion of the temperature adjustment layer 13, and liquid nitrogen or hot liquid can be injected into the inside of the temperature adjustment layer 13 through the liquid inlet 131 to adjust the temperature inside the tank 11.
A liquid outlet communicated with the inside of the temperature adjusting layer 13 is formed in the lower portion of the temperature adjusting layer 13, and liquid nitrogen or hot liquid can be discharged out of the temperature adjusting layer 13 through the liquid outlet, wherein the liquid nitrogen can be directly volatilized from the opened liquid inlet 131 in a state that the liquid outlet is sealed.
All be provided with on inlet 131 and the liquid outlet with inlet 131 and liquid outlet interference fit's rubber buffer, the rubber buffer is used for the sealed of inlet 131 and liquid outlet, and sealing performance is good.
In this embodiment, all be provided with the internal thread on the inside wall of inlet 131 and liquid outlet, be provided with on the lateral wall of rubber buffer with inlet 131 or liquid outlet inside wall on internal thread fit threaded connection's the external screw thread, the rubber buffer can with inlet 131 or liquid outlet thread sealing connection, threaded connection's mode, the installation of the rubber buffer of being convenient for or taking out.
Wherein, be provided with the rubber packing ring in the sealed lid 17 for after sealed lid 17 screws, offset with the opening border of jar body 11 to realize sealed between sealed lid 17 and the jar body 11.
Specifically, in this embodiment, a groove surrounding the inner side wall of the sealing cover 17 for one circle is formed in the inner side wall of the sealing cover 17, the rubber gasket is accommodated in the groove and protrudes out of the groove, and after the sealing cover 17 is screwed, the rubber gasket abuts against the opening edge of the tank body 11, so that the sealing performance between the sealing cover 17 and the tank body 11 is ensured.
Wherein, the inner side wall of the tank body 11 is provided with scales for measuring the amount of the soil or rock sample put into the tank body 11.
Wherein, the device 10 for extracting the gas in the soil further comprises a temperature measuring device, and the measuring end of the measuring device is arranged in the tank body 11 in a penetrating way and is used for measuring the temperature in the tank body 11.
Specifically, in this embodiment, the temperature measuring device may be a thermometer or a temperature sensor, and a measuring end of the temperature measuring device passes through the sealing cover 17 and extends into the tank 11 to measure the temperature in the tank.
Example 3:
as shown in fig. 4, a method for extracting soil gas, which is applied to the soil gas extraction device 10 of the above embodiment 1 or 2, includes steps S110 to S170.
Step S110: quantitatively adding the soil or rock soil sample collected in situ into the tank body 11, injecting saturated salt solution, and screwing the sealing cover 17.
Specifically, in-situ acquisition refers to acquisition at a field home location.
Step S120: the saturated saline solution is continuously injected into the tank body 11 through the plug body 21 on the sealing cover 17, and the air in the tank body 11 is emptied.
Specifically, the syringe needle and the air outlet needle respectively penetrate through the plug body 21 on the sealing cover 17 and extend into the tank body 11, saturated saline solution is continuously injected into the tank body 11 through the syringe, air in the tank body 11 is discharged from the air outlet needle until liquid flows out from the air outlet needle, the air in the tank body 11 is emptied, and then the syringe needle and the air outlet needle are pulled out.
Step S130: the liquid inlet 131 of the temperature adjusting layer 13 is opened, and a predetermined amount of liquid nitrogen is injected.
Specifically, liquid nitrogen is injected into the temperature adjusting layer 13, the injection amount is about one third of the internal space of the temperature adjusting layer 13, and the rubber plug is plugged.
Step S140: after the liquid is moved to the designated position, the liquid inlet 131 and/or the liquid outlet is opened, and the liquid nitrogen is naturally volatilized or drained.
Specifically, after being transported to a laboratory, the rubber stopper of the liquid inlet 131 is opened under a fume hood, and liquid nitrogen is naturally volatilized to the greatest extent.
Step S150: and injecting hot liquid into the temperature adjusting layer 13, and standing for a first preset time to enable the temperature in the tank body 11 to reach a preset temperature.
Specifically, after the liquid nitrogen is completely volatilized, hot water is injected into the temperature adjusting layer 13, and the temperature adjusting layer is placed for a first preset time (the placing time is determined according to the temperature of the hot liquid and the temperature of the hot liquid), so that the temperature in the tank body 11 reaches 30-50 ℃.
Step S160: and starting the stirring device 19, stirring the soil or rock sample in the tank body 11, stopping stirring after the second preset time, and standing for a third preset time.
Specifically, the protective cover is unscrewed, the driving motor is started, the stirring tool bit 193 rotates to stir the soil or rock soil sample in the tank body 11, different stirring time is set according to different samples, so that the sample is fully stirred, and after the stirring is finished, the stirring is kept still for a third preset time (the third preset time is determined according to the settling speed of different sample particles in the saturated salt solution).
As the soil or rock sample is broken, the gas in the gap is released, the liquid level in the tank 11 drops and the gas collects at the top of the interior of the tank 11.
Step S170: the gas is quantitatively extracted through the plug body 21 on the sealing cover 17, and the gas components and the content of the chromatograph and the chromatograph-mass spectrometer are measured.
Specifically, the extraction device needle passes through the plug body 21 on the sealing cover 17 and extends into the tank body 11 to extract quantitative gas for measuring the gas components and content of the chromatograph and chromatograph-mass spectrometer.
After the above steps are completed, the in-soil gas extraction device 10 is cleaned and dried indoors.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. An extraction device for gas in soil is characterized by comprising a tank body, a temperature regulation layer and a vacuum layer which are sequentially stacked from inside to outside;
the device comprises a tank body, a sealing cover, a stirring device and a stirring device, wherein an opening is formed in one side of the tank body, the tank body can be in threaded sealing connection with the sealing cover, and the stirring device is arranged in the tank body and used for stirring soil or rock samples placed in the tank body;
the temperature adjusting layer is arranged in a hollow manner and used for adjusting the temperature in the tank body by injecting liquid nitrogen or hot liquid into the temperature adjusting layer;
wherein the vacuum layer is used for heat preservation of the temperature adjusting layer.
2. The in-soil gas extraction device of claim 1, further comprising an elastic protection layer disposed outside the vacuum layer for protection of the vacuum layer.
3. The in-soil gas extraction device according to claim 1 or 2, wherein the stirring device comprises:
a driving motor disposed at an outer side of the tank body;
one end of the rotating rod is connected with the driving end of the driving motor, and the other end of the rotating rod penetrates through the tank body; and
and the stirring tool bit is arranged on the rotating rod positioned in the tank body and is used for executing rotating action under the driving of the driving motor.
4. The in-soil gas extraction device of claim 3, further comprising a protective cover threadably connected to said canister, said protective cover completely encasing said drive motor for protection thereof.
5. The in-soil gas extraction device as recited in claim 1, wherein the sealing cap is provided with at least one threaded through hole extending through the sealing cap, the threaded through hole being in threaded sealing connection with the plug body;
the plug body is made of rubber or the middle part of the plug body is made of rubber, and the plug body is used for enabling an extraction device to penetrate through the plug body to extract gas.
6. The apparatus as claimed in claim 1, further comprising a temperature measuring device having a measuring end penetrating the tank body for measuring a temperature in the tank body.
7. The apparatus for extracting gas from soil as claimed in claim 1, wherein the tank body has a scale on an inner side wall thereof for measuring an amount of soil or rock sample put into the tank body.
8. The apparatus as claimed in claim 1, wherein the temperature adjusting layer is provided with a liquid inlet and a liquid outlet communicated with the inside of the temperature adjusting layer, and the liquid inlet and the liquid outlet are both provided with rubber plugs in interference fit with the liquid inlet and the liquid outlet.
9. The in-soil gas extraction device of claim 1, wherein a rubber gasket is disposed in the sealing cap for abutting against an opening edge of the canister body after the sealing cap is tightened to seal the sealing cap to the canister body.
10. A method for extracting gas in soil is characterized by comprising the following steps:
quantitatively adding the soil or rock soil sample collected in situ into the tank body, injecting saturated salt solution, and screwing the sealing cover;
penetrating through the plug body on the sealing cover, continuously injecting saturated salt solution into the tank body, and emptying the air in the tank body;
opening a liquid inlet on the temperature adjusting layer, and injecting a preset amount of liquid nitrogen;
after the liquid is moved to the designated position, opening the liquid inlet and/or the liquid outlet, and naturally volatilizing the liquid nitrogen or exhausting the liquid nitrogen;
injecting hot liquid into the temperature adjusting layer, and standing for a first preset time to enable the temperature in the tank body to reach a preset temperature;
starting a stirring device, stirring the soil or rock soil sample in the tank body, stopping stirring after a second preset time, and standing for a third preset time;
and (3) passing through the plug body on the sealing cover, extracting quantitative gas, and measuring the gas components and content of the chromatograph and chromatograph-mass spectrometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011064195.8A CN114427992A (en) | 2020-09-30 | 2020-09-30 | Device and method for extracting gas in soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064195.8A CN114427992A (en) | 2020-09-30 | 2020-09-30 | Device and method for extracting gas in soil |
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| CN114427992A true CN114427992A (en) | 2022-05-03 |
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| CN203083853U (en) * | 2013-03-12 | 2013-07-24 | 东北石油大学 | Oil gas geochemical exploration trace gas collecting device |
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