CN116818598A - Natural gas hydrate rock core gas content testing device - Google Patents
Natural gas hydrate rock core gas content testing device Download PDFInfo
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- CN116818598A CN116818598A CN202311090760.1A CN202311090760A CN116818598A CN 116818598 A CN116818598 A CN 116818598A CN 202311090760 A CN202311090760 A CN 202311090760A CN 116818598 A CN116818598 A CN 116818598A
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- 239000007789 gas Substances 0.000 title claims abstract description 211
- 238000012360 testing method Methods 0.000 title claims abstract description 37
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000011435 rock Substances 0.000 title claims abstract description 24
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000007789 sealing Methods 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
Abstract
The application discloses a natural gas hydrate core gas content testing device which comprises a core clamping structure, a gas supply structure, a gas metering structure and a back pressure protection structure, wherein the core clamping structure is provided with a clamping barrel cabin, a clamping cavity is formed in the clamping barrel cabin, a gas conveying part is arranged at the end part of the clamping cavity, a supporting ring part is arranged in the clamping cavity, the supporting ring part is sleeved on the periphery side of a core and fixes the core in the clamping cavity, when the pressure of the output end of the gas conveying part is larger than a pressure threshold value, gas enters the gas metering structure through the back pressure protection structure, and when the pressure of the output end of the gas conveying part is smaller than or equal to the pressure threshold value, the gas is blocked by the back pressure protection structure. According to the application, the support ring piece is sleeved on the outer peripheral side of the rock core and used for clamping the rock core, so that the environmental parameters in the rock core gas content testing process are stable and fixedly clamped, and the stability of the rock core testing process is ensured; the back pressure protection structure ensures that the pressure is always in the clamping cylinder cabin and does not overflow when the pressure does not reach the threshold value, and ensures that the gas is stable.
Description
Technical Field
The application relates to the technical field of core testing, in particular to a device for testing the gas content of a natural gas hydrate core.
Background
The natural gas hydrate is an ice-snow-like cage compound formed by natural gas and water under the conditions of higher pressure and lower temperature, and is widely distributed in offshore large Liu Po and frozen earth stratum environments, the development of natural gas hydrate resources, disaster prevention and control and environmental evaluation are all required to be greatly conducted on basic researches on physical chemistry, mechanical properties and other properties of a natural gas hydrate reservoir, the basic researches are mainly conducted on natural gas hydrate core samples, natural gas hydrate reservoir physical property in-situ or quasi-in-situ tests are conducted, the quasi-in-situ test technology refers to pressure-maintaining coring, transferring and testing integrated technology for the natural gas hydrate reservoir, the pressure-maintaining coring refers to the in-situ temperature and pressure conditions of the core to the greatest extent in the drilling process, the decomposition of the natural gas hydrate is avoided, the composition, pore structure and basic physical properties of the core are not greatly different from those of the original state, the natural gas hydrate is guaranteed to be stored in a long-term pressure-maintaining mode after the natural gas hydrate reservoir is extracted to the sea surface, and the natural gas hydrate core is to be transported to a land laboratory for testing.
The gas content is a key parameter in the core test, the larger the gas content is, the higher the development value of the corresponding position is, the current gas content test is usually a flow meter test method, after the core is subjected to pressure maintaining coring, gas is injected into the core, part of the gas is discharged from the core, and the gas content in the core is calculated by determining the gas content of the gas supply, the gas content of the discharged gas and the gas content in the closed environment where the core is located.
However, the existing gas content testing mode cannot ensure the stable state of the core in the testing process, and the unstable core in the gas supply process may cause low accuracy of the finally calculated gas content value.
Disclosure of Invention
Therefore, the application provides the gas content testing device for the natural gas hydrate core, which effectively solves the problems that the gas content testing mode in the prior art cannot ensure the stable state of the core in the testing process and the unstable core in the gas supply process can cause low accuracy of the finally calculated gas content value.
In order to solve the technical problems, the application specifically provides the following technical scheme: a natural gas hydrate core gas content testing device is provided with:
the rock core clamping structure comprises a clamping barrel cabin, wherein an air inlet end and an air outlet end are respectively formed at two ends of the clamping barrel cabin, a clamping cavity is formed in the clamping barrel cabin, an air conveying piece is arranged in the clamping cavity close to the air inlet end and the air outlet end, a supporting ring piece is arranged in the clamping cavity, the supporting ring piece is sleeved on the periphery of the rock core and fixes the rock core in the clamping cavity, a pressurizing structure is arranged on the clamping barrel cabin, the pressurizing structure is communicated with the inside of the clamping cavity, and the pressurizing structure is used for providing an environment with the same storage pressure and temperature as those of the rock core for the inside of the clamping cavity;
the gas supply structure is connected with the gas transmission piece at the gas inlet end and is used for injecting gas into the clamping cavity so that the pressure of the inlet end and the outlet end of the core is the same;
the gas metering structure is connected with the gas conveying piece at the gas outlet end and is used for metering the volume of the gas entering the gas metering structure, part of the gas injected into the clamping cavity flows into the core, part of the gas is positioned in the clamping cavity, and part of the gas flows into the gas metering structure;
the back pressure protection structure is arranged between the gas metering structure and the gas conveying piece, the pressure threshold value set by the back pressure protection structure is the same as the core storage pressure, when the pressure of the output end of the gas conveying piece is larger than the pressure threshold value, gas can enter the gas metering structure through the back pressure protection structure, and when the pressure of the output end of the gas conveying piece is smaller than or equal to the pressure threshold value, the gas is blocked by the back pressure protection structure;
pressure sensors are arranged at the upstream end of the gas transmission piece positioned at the gas inlet end and the downstream end of the gas transmission piece positioned at the gas outlet end.
Further, sealing ring seats are arranged at two ends in the clamping cavity, and each sealing ring seat consists of a first connecting part, a second connecting part and a third connecting part which are sequentially connected;
the first connecting portion, the second connecting portion and the third connecting portion are annular, the inner diameter of the first connecting portion is larger than the inner diameter of the third connecting portion, and the inner diameter of the third connecting portion is consistent with the outer diameter of the core.
Further, the support ring piece comprises a plurality of connecting grooves arranged on the outer periphery side of the third connecting part, a sliding block arranged in the connecting grooves in a sliding manner, a rotating plate arranged on the sliding block in a rotating manner, and a first lifting seat arranged at the end part of the rotating plate in a rotating manner;
adjacent first lifting seat limit portion mutually agrees, form circumference centre gripping outer wall when first lifting seat draws in, the rock core is provided with the seal cover outward, first lifting seat bottom is connected seal cover tip periphery side.
Further, a second lifting seat is arranged in the clamping cavity, lifting shafts are connected to the first lifting seat and the second lifting seat, a through groove for the lifting shafts to penetrate is formed in the clamping barrel cabin, and a rotary sleeve is sleeved outside the clamping barrel cabin;
the rotary sleeve is internally provided with an installation cavity, the inner wall of the installation cavity is provided with a connecting shaft seat, a rotary bolt is rotationally arranged on the connecting shaft seat, and the rotary bolt is rotationally connected with the end part, far away from the first lifting seat, of the second lifting seat on the lifting shaft.
Further, the pressurizing structure comprises a high-pressure pump arranged on the clamping cylinder cabin and a temperature regulating element arranged on the clamping cylinder cabin;
the pipeline connected with the high-pressure pump extends into the clamping cavity, and the end part of the temperature regulating element extends into the clamping cavity.
Further, the gas transmission piece comprises a gas transmission cylinder, a first mounting seat arranged on the outer peripheral side of the gas transmission cylinder and a second mounting seat arranged outside the clamping cylinder cabin;
the outer diameter of the gas transmission cylinder is the same as the inner diameter of the third connecting part, and the first mounting seat is mounted on the second mounting seat through a bolt.
Further, the gas supply structure comprises a gas transmission tank, a booster pump and a gas transmission tank;
the gas transmission tank output is connected with the booster pump, the booster pump downstream end is provided with the gas transportation jar, the output of gas transportation jar with be located the inlet end the gas transmission spare is connected, the gas transmission tank with between the booster pump, the booster pump with between the gas transportation jar and the gas transportation jar output all is provided with the ooff valve.
Further, a connecting pipeline is connected to the outside of the gas transmission cylinder, the pressure sensor is connected to the connecting pipeline, and the output end of the gas transmission cylinder is connected to the connecting pipeline.
Further, the back pressure protection structure comprises a fixed groove seat, a movable groove seat movably arranged on the fixed groove seat, a first air cylinder arranged on the movable groove seat and a second air cylinder movably arranged on the first air cylinder;
the second inflator is connected with the end part of the gas transmission tube, the first pressing seat is arranged on the outer peripheral side of the fixed groove seat, the second pressing seat is arranged on the outer peripheral side of the movable groove seat, the first pressing seat is provided with a pressure tube, the second pressing seat is connected with the end part of the pressure tube, and the pressure tube is a telescopic tube with a spring inside.
Further, an air vent groove with gradually increased inner diameter is arranged in the movable groove seat, a connecting cylinder is arranged on the inner side of the movable groove seat, the air vent groove is communicated with the connecting cylinder, a side groove and a central groove are arranged in the fixed groove seat, and the opening part of the connecting cylinder is opposite to the inner wall of the side groove;
the center groove is including the first slot section, second slot section and the third slot section that connect gradually, the internal diameter of first slot section is less than the internal diameter of third slot section, the ventilation groove is connected on the second slot section, movable slot seat side is connected with the valve column through the connecting axle, the valve column with part the second slot section agrees with.
Compared with the prior art, the application has the following beneficial effects:
according to the application, the clamping cavity is formed in the clamping cylinder cabin, the supporting ring piece is arranged in the clamping cavity and sleeved on the outer peripheral side of the rock core, the rock core is clamped, the clamping cylinder cabin is provided with the pressurizing structure, and the pressurizing structure is used for providing the environment which is the same as the storage pressure and the temperature of the rock core for the inside of the clamping cavity, so that the environmental parameters in the gas content testing process of the rock core are stable and are fixedly clamped, and the stability of the testing process of the rock core is ensured;
according to the application, the back pressure protection structure is arranged between the gas metering structure and the gas conveying part, when the pressure of the gas conveying part is larger than the pressure threshold value, gas can enter the gas metering structure through the back pressure protection structure, so that the gas is further ensured not to overflow in the clamping cylinder cabin all the time when the pressure does not reach the threshold value, the gas stability is ensured, and the testing accuracy is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
Fig. 1 is a schematic structural diagram of a gas content testing device for a natural gas hydrate core according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a core clamping structure according to an embodiment of the present application, in which a sealing sleeve is folded to clamp a core;
fig. 3 is a schematic structural diagram of a core clamping structure seal sleeve expansion in an embodiment of the present application;
FIG. 4 is an enlarged schematic view of the structure of FIG. 2A;
FIG. 5 is an enlarged schematic view of the structure of FIG. 3B;
fig. 6 is a schematic structural view of a sealing sleeve in a clamping cylinder cabin in an embodiment of the application;
fig. 7 is a schematic structural view of the external expansion of the sealing sleeve in the clamping cylinder cabin in the embodiment of the application;
FIG. 8 is a schematic structural diagram of a back pressure protection structure according to an embodiment of the present application;
fig. 9 is a schematic diagram of a structure in which air pressure reaches a pressure threshold and air flows in a back pressure protection structure according to an embodiment of the present application.
Reference numerals in the drawings are respectively as follows:
1-core; 2-a core clamping structure; 3-an air supply structure; 4-a gas metering structure; 5-a back pressure protection structure; 6-a pressure sensor;
21-clamping the barrel compartment; 22-clamping cavity; 23-gas conveying parts; 24-supporting ring member; 25-a pressing structure; 26-a seal ring seat;
31-a gas delivery tank; 32-a booster pump; 33-gas transport cylinders; 34-switching a valve;
51-a fixed groove seat; 52-a movable groove seat; 53-a first cartridge; 54-a second cartridge; 55-a first pressing seat; 56-a second pressing seat; 57-pressure cylinder; 58-vent slots; 59-connecting cylinder; 510-side grooves; 511-a central slot; 512-a first groove section; 513-a second trough section; 514-a third trough section; 515-connecting shaft; 516-spool;
231-air delivery cylinder; 232-a first mount; 233-a second mount; 234-bolts; 235-connecting pipes;
241-connecting grooves; 242-slide block; 243-rotating plate; 244-a first lifting seat; 245-sealing sleeve; 246-a second lifting seat; 247-lifting shaft; 248-through slots; 249-rotating the sleeve; 2410-mounting cavity; 2411-connecting a shaft seat; 2412-a rotation bolt;
251-high pressure pump; 252-a tempering element;
261-first connection portion; 262-a second connection; 263-third connection.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, the application provides a natural gas hydrate core gas content testing device, which is provided with a core clamping structure 2, a gas supply structure 3, a gas metering structure 4 and a back pressure protection structure 5.
The rock core clamping structure 2 is provided with a clamping cylinder cabin 21, an air inlet end and an air outlet end are respectively formed in two ends of the clamping cylinder cabin 21, a clamping cavity 22 is formed in the clamping cylinder cabin 21, an air conveying piece 23 is arranged in the clamping cavity 22 close to the air inlet end and the air outlet end, a supporting ring piece 24 is arranged in the clamping cavity 22, the supporting ring piece 24 is sleeved on the periphery side of the rock core 1 and fixes the rock core 1 in the clamping cavity 22, a pressurizing structure 25 is arranged on the clamping cylinder cabin 21, the pressurizing structure 25 is communicated with the inside of the clamping cavity 22, and the pressurizing structure 25 is used for providing the environment with the same storage pressure and temperature as those of the rock core 1 for the inside of the clamping cavity 22.
The gas supply structure 3 is connected with a gas delivery piece 23 at the gas inlet end, and the gas supply structure 3 is used for injecting gas into the clamping cavity 22, so that the pressure of the inlet end and the outlet end of the core 1 is the same.
The gas metering structure 4 is connected with the gas delivery piece 23 at the gas outlet end, the gas metering structure 4 is used for metering the volume of the gas entering, part of the gas injected into the clamping cavity 22 flows into the core 1, part of the gas is positioned in the clamping cavity 22, and part of the gas flows into the gas metering structure 4.
The back pressure protection structure 5 is arranged between the gas metering structure 4 and the gas conveying piece 23, the pressure threshold value set by the back pressure protection structure 5 is the same as the storage pressure of the rock core 1, when the output end pressure of the gas conveying piece 23 is greater than the pressure threshold value, gas can enter the gas metering structure 4 through the back pressure protection structure 5, and when the output end pressure of the gas conveying piece 23 is smaller than or equal to the pressure threshold value, the gas is blocked by the back pressure protection structure 5.
Pressure sensors 6 are provided at both the upstream end of the gas-conveying member 23 at the gas inlet end and the downstream end of the gas-conveying member 23 at the gas outlet end.
According to the application, the clamping cavity 22 is formed in the clamping cylinder cabin 21, the supporting ring piece 24 is arranged in the clamping cavity 22, the supporting ring piece 24 is sleeved on the periphery side of the core 1 and used for clamping the core 1, the pressurizing structure 25 is arranged on the clamping cylinder cabin 21 and used for providing the environment with the same storage pressure and temperature as the core 1 for the inside of the clamping cavity 22, so that the environment parameters in the gas content testing process of the core 1 are stable and are fixedly clamped, and the stability of the testing process of the core 1 is ensured.
According to the application, the back pressure protection structure 5 is arranged between the gas metering structure 4 and the gas conveying piece 23, when the pressure of the gas conveying piece 23 is larger than the pressure threshold value, gas can enter the gas metering structure 4 through the back pressure protection structure 5, so that the condition that the gas is always in the clamping cylinder cabin 21 and does not overflow when the pressure does not reach the threshold value is further ensured, the gas stability is ensured, and the testing accuracy is improved.
In order to facilitate the placement of the core 1, the present application is designed in such a way that, as shown in fig. 4 and 5, sealing ring seats 26 are provided at two ends in the clamping cavity 22, the sealing ring seats 26 are composed of a first connecting portion 261, a second connecting portion 262 and a third connecting portion 263 which are sequentially connected, the first connecting portion 261, the second connecting portion 262 and the third connecting portion 263 are all annular, the inner diameter of the first connecting portion 261 is larger than the inner diameter of the third connecting portion 263, and the inner diameter of the third connecting portion 263 is identical to the outer diameter of the core 1.
The external diameter of the core 1 is smaller than the internal diameter of the first connecting portion 261, and the core 1 can directly pass through the first connecting portion 261, the second connecting portion 262 and then be placed in the third connecting portion 263, so that two end portions of the core 1 are placed in the third connecting portion 263, and the end portion of the core 1 can be directly supported by the third connecting portion 263.
In order to keep the core 1 integrally fixed, the application further provides a supporting ring 24, as shown in fig. 3, 4, 5 and 6, the supporting ring 24 is sleeved on the outer peripheral side of the core 1 far away from the end region, the supporting ring 24 adopts the following preferred embodiment, the supporting ring 24 comprises a plurality of connecting grooves 241 arranged on the outer peripheral side of the third connecting part 263, a sliding block 242 slidingly arranged in the connecting grooves 241, a rotating plate 243 rotatably arranged on the sliding block 242, a first lifting seat 244 rotatably arranged on the end part of the rotating plate 243, the edges of adjacent first lifting seats 244 are mutually engaged, the first lifting seats 244 form a circumferential clamping outer wall when being folded, a sealing sleeve 245 is arranged outside the core 1, and the bottom of the first lifting seat 244 is connected on the outer peripheral side of the end part of the sealing sleeve 245.
In the above embodiment, the sealing sleeve 245 may be a rubber sleeve, and the first lifting seat 244 is used to drive the rubber sleeve to expand or retract, and when in the retracted state, the outer wall of the core 1 can be fixed.
In order to control the expansion or contraction of the sealing sleeve 245, as shown in fig. 2 and 3, the application further provides a second lifting seat 246 in the clamping cavity 22, lifting shafts 247 are connected to the first lifting seat 244 and the second lifting seat 246, a through groove 248 for the lifting shafts 247 to penetrate is formed in the clamping cylinder chamber 21, a rotary sleeve 249 is sleeved outside the clamping cylinder chamber 21, a mounting cavity 2410 is arranged in the rotary sleeve 249, a connecting shaft seat 2411 is arranged on the inner wall of the mounting cavity 2410, a rotary bolt 2412 is rotatably arranged on the connecting shaft seat 2411, and the rotary bolt 2412 is rotatably connected to the ends, far away from the first lifting seat 244 and the second lifting seat 246, of the lifting shaft 247.
In the above embodiment, as shown in fig. 4, 5, 6 and 7, the rotating sleeve 249 drives the connecting shaft base 2411 to rotate, and drives the rotating bolt 2412 to rotate, so as to drive the lifting shaft 247 to move up or down in the through groove 248, and drive the first lifting seat 244 and the second lifting seat 246 to move up or down, so as to drive the sealing sleeve 245 to expand or contract.
The pressurizing structure 25 in the present application is used for providing the same environment as the core 1 storing pressure and temperature inside the holding cavity 22, the pressurizing structure 25 adopts the following preferred embodiment, the pressurizing structure 25 comprises a high-pressure pump 251 installed on the holding cylinder 21, and a temperature adjusting element 252 arranged on the holding cylinder 21, the pipe connected with the high-pressure pump 251 extends into the holding cavity 22, and the end of the temperature adjusting element 252 extends into the holding cavity 22.
The air conveying member 23 in the application can be used for fixing the end part of the core 1 besides conveying the air 23, and the air conveying member 23 is of a detachable structure, so that the core 1 can be conveniently put in and taken out, the air conveying member 23 adopts the following preferred embodiment, the air conveying member 23 comprises an air conveying cylinder 231, a first mounting seat 232 arranged on the outer peripheral side of the air conveying cylinder 231 and a second mounting seat 233 arranged outside the clamping cylinder cabin 21, the outer diameter of the air conveying cylinder 231 is the same as the inner diameter of the third connecting part 263, and the first mounting seat 232 is mounted on the second mounting seat 233 through a bolt 234.
The first mounting seat 232 and the second mounting seat 233 are arranged opposite to each other, the first mounting seat 232 is mounted on the second mounting seat 233 through the bolts 234, and the end part of the gas transmission cylinder 231 is also abutted against the end part of the core 1.
The air supply structure 3 in the application adopts the following preferred embodiment, the air supply structure 3 comprises an air conveying tank 31, a booster pump 32 and an air conveying cylinder 33, the booster pump 32 is connected to the output end of the air conveying tank 31, the air conveying cylinder 33 is arranged at the downstream end of the booster pump 32, the output end of the air conveying cylinder 33 is connected with an air conveying piece 23 positioned at the air inlet end, and a switch valve 34 is arranged between the air conveying tank 31 and the booster pump 32, between the booster pump 32 and the air conveying cylinder 33 and at the output end of the air conveying cylinder 33.
The switch valve 34 is used for controlling the switch states of the output ends of the gas transportation cylinder 33, the pressure sensor 6 is also used for monitoring the pressure value of the gas transportation cylinder 33, the content of the gas transportation cylinder 33 is fixed, the pressure of transportation is provided for the gas in the gas transportation cylinder 31 through the booster pump 32, the gas enters the transportation cylinder 33 through the switch valve 34 after being pressurized, and then enters the gas transportation piece 23 through the switch valve 34, and the arrangement of the gas transportation cylinder 33 can calculate the gas quantity before gas supply and the gas residual quantity after gas supply.
For pressure detection at the input, a connecting pipe 235 is connected to the outside of the gas cylinder 231, the pressure sensor 6 is connected to the connecting pipe 235, and the output of the gas cylinder 33 is connected to the connecting pipe 235.
In order to control the gas output, the application also provides a back pressure protection structure 5, the back pressure protection structure 5 adopts the following preferred embodiment, as shown in fig. 8 and 9, the back pressure protection structure 5 comprises a fixed groove seat 51, a movable groove seat 52 movably arranged on the fixed groove seat 51, a first gas cylinder 53 arranged on the movable groove seat 52 and a second gas cylinder 54 movably arranged on the first gas cylinder 53, the second gas cylinder 54 is connected to the end part of the gas transmission cylinder 231, a first pressure seat 55 is arranged on the outer peripheral side of the fixed groove seat 51, a second pressure seat 56 is arranged on the outer peripheral side of the movable groove seat 52, a pressure cylinder 57 is arranged on the first pressure seat 55, the second pressure seat 56 is connected to the end part of the pressure cylinder 57, and the pressure cylinder 57 is a telescopic cylinder with a spring inside.
Wherein, the movable groove seat 52 is internally provided with an air vent groove 58 with gradually increased inner diameter, the inner side of the movable groove seat 52 is provided with a connecting cylinder 59, the air vent groove 58 is communicated with the connecting cylinder 59, the fixed groove seat 51 is internally provided with a side groove 510 and a central groove 511, and the opening part of the connecting cylinder 59 is opposite to the inner wall of the side groove 510.
In the above embodiment, the gas enters the second air cylinder 54 from the air delivery cylinder 231, enters the movable groove seat 52 through the first air cylinder 53, and then enters the fixed groove seat 51, in the initial state, the gas cannot directly enter the fixed groove seat 51 through the movable groove seat 52, and can enter the fixed groove seat 51 from the movable groove seat 52 only under a certain pressure, wherein the movable groove seat 52 gradually moves towards one side of the fixed groove seat 51 under the action of air pressure in the process of entering the air channel 58, and when the air pressure reaches a certain value, the movable groove seat 52 is driven to move a certain distance, and then the fixed groove seat 51 is communicated with the movable groove seat 52, so that the transportation of the gas is realized.
Wherein, first inflator 53 and second inflator 54 are swing joint, and first inflator 53 can follow movable groove seat 52 activity, and second inflator 54 position is fixed, and first inflator 53 and second inflator 54 are sealed in the activity process of first inflator 53, and the gas can not leak.
In order to achieve the above object, the present application is further designed such that the central groove 511 includes a first groove section 512, a second groove section 513 and a third groove section 514 connected in sequence, the inner diameter of the first groove section 512 is smaller than that of the third groove section 514, the ventilation groove 58 is connected to the second groove section 513, the side edge of the movable groove seat 52 is connected to a valve column 516 through a connecting shaft 515, and the valve column 516 is engaged with a part of the second groove section 513.
Under the action of air pressure, as shown in fig. 9, the movable slot seat 52 gradually approaches the fixed slot seat 51 to move, so as to drive the connecting cylinder 59 to move in the side slot 510, the opening position of the connecting cylinder 59 gradually changes from aiming at the inner wall of the side slot 510 to be opposite to the opening position of the side slot 510 during the movement, and the valve column 516 is gradually separated from the second slot section 513 during the movement, so that the valve column 516 does not block the communication position between the side slot 510 and the second slot section 513 any more, and at the moment, air can enter the connecting cylinder 59 through the ventilation slot 58 and enter the central slot 511 through the side slot 510, and then is continuously transported to the downstream end through the fixed slot seat 51 to the air metering structure 4.
In summary, the main implementation process of the application is as follows:
the core 1 directly passes through the first connecting part 261 and the second connecting part 262 and then is placed in the third connecting part 263, so that both end parts of the core 1 are placed in the third connecting part 263;
rotating the rotary sleeve 249 drives the connecting shaft seat 2411 to rotate and drives the rotary bolt 2412 to rotate, thereby driving the lifting shaft 247 to move downwards in the through groove 248 and driving the first lifting seat 244 and the second lifting seat 246 to move downwards, thereby driving the sealing sleeve 245 to shrink inwards, and fixing the outer wall of the rock core 1 when the sealing sleeve 245 is in a folded state;
abutting the end part of the air conveying cylinder 231 against the end part of the rock core 1, arranging the first mounting seat 232 and the second mounting seat 233 opposite to each other, and mounting the first mounting seat 232 on the second mounting seat 233 through a bolt 234;
the high-pressure pump 251 and the temperature regulating element 252 are driven to provide the environment with the same storage pressure and temperature as the core 1 for the interior of the clamping cavity 22;
the booster pump 32 provides transportation pressure for the gas in the gas transmission tank 31, and the pressurized gas enters the transportation cylinder 33 through the switch valve 34, then enters the gas transmission piece 23 and the core 1 through the switch valve 34, and is discharged from the gas transmission piece 23 at the output end;
the gas enters the second air cylinder 54 from the air cylinder 231 at the output end, enters the movable groove seat 52 through the first air cylinder 53, enters the connecting cylinder 59 through the ventilation groove 58 and enters the central groove 511 through the side groove 510 under certain pressure, and then is continuously transported to the gas metering structure 4 from the fixed groove seat 51 to the downstream end;
and recording the value of the pressure sensor 6 at the input end and the output end, reading the value of the gas metering structure 4 after the value of the pressure sensor 6 is stable, and obtaining the gas content by subtracting the gas content of the core 1 in the core clamping structure 2 and the calculated amount of the discharged gas from the injected gas content.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this application will occur to those skilled in the art, and are intended to be within the spirit and scope of the application.
Claims (10)
1. The device for testing the gas content of the natural gas hydrate core is characterized by comprising the following components:
the core clamping structure (2) is provided with a clamping barrel cabin (21), an air inlet end and an air outlet end are respectively formed at two ends of the clamping barrel cabin (21), a clamping cavity (22) is formed in the clamping barrel cabin (21), the clamping cavity (22) is close to the air inlet end and the air outlet end and is provided with an air conveying piece (23), a supporting ring piece (24) is arranged in the clamping cavity (22), the supporting ring piece (24) is sleeved on the periphery side of the core (1) and fixes the core (1) in the clamping cavity (22), a pressurizing structure (25) is arranged on the clamping barrel cabin (21), the pressurizing structure (25) is communicated with the inside of the clamping cavity (22), and the pressurizing structure (25) is used for providing an environment which is the same as the storage pressure and the temperature of the core (1) for the inside of the clamping cavity (22).
The gas supply structure (3) is connected with the gas transmission piece (23) at the gas inlet end, and the gas supply structure (3) is used for injecting gas into the clamping cavity (22) so that the pressure of the inlet end and the outlet end of the core (1) is the same;
the gas metering structure (4) is connected with the gas conveying piece (23) at the gas outlet end, the gas metering structure (4) is used for metering the volume of the gas entering, part of the gas injected into the clamping cavity (22) flows into the core (1), part of the gas is positioned in the clamping cavity (22), and part of the gas flows into the gas metering structure (4);
the back pressure protection structure (5) is arranged between the gas metering structure (4) and the gas conveying piece (23), a pressure threshold value set by the back pressure protection structure (5) is the same as the storage pressure of the core (1), when the output end pressure of the gas conveying piece (23) is larger than the pressure threshold value, gas can enter the gas metering structure (4) through the back pressure protection structure (5), and when the output end pressure of the gas conveying piece (23) is smaller than or equal to the pressure threshold value, the gas is blocked by the back pressure protection structure (5);
pressure sensors (6) are arranged at the upstream end of the gas transmission piece (23) positioned at the gas inlet end and the downstream end of the gas transmission piece (23) positioned at the gas outlet end.
2. The natural gas hydrate core gas content testing device according to claim 1, wherein sealing ring seats (26) are arranged at two ends in the clamping cavity (22), and the sealing ring seats (26) are composed of a first connecting part (261), a second connecting part (262) and a third connecting part (263) which are sequentially connected;
the first connecting portion (261), the second connecting portion (262) and the third connecting portion (263) are all annular, the inner diameter of the first connecting portion (261) is larger than the inner diameter of the third connecting portion (263), and the inner diameter of the third connecting portion (263) is consistent with the outer diameter of the core (1).
3. The natural gas hydrate core gas content testing device according to claim 2, wherein the support ring (24) comprises a plurality of connecting grooves (241) arranged on the outer peripheral side of the third connecting part (263), a sliding block (242) arranged in the connecting grooves (241) in a sliding manner, a rotating plate (243) arranged on the sliding block (242) in a rotating manner, and a first lifting seat (244) arranged at the end part of the rotating plate (243) in a rotating manner;
adjacent first lifting seat (244) limit portion mutually agrees, form circumference centre gripping outer wall when first lifting seat (244) draws in, rock core (1) is provided with seal cover (245) outward, first lifting seat (244) bottom is connected seal cover (245) tip periphery side.
4. The gas content testing device for the natural gas hydrate core according to claim 3, wherein a second lifting seat (246) is further arranged in the clamping cavity (22), lifting shafts (247) are connected to the first lifting seat (244) and the second lifting seat (246), a through groove (248) for the lifting shafts (247) to penetrate is formed in the clamping barrel cabin (21), and a rotary sleeve (249) is sleeved outside the clamping barrel cabin (21);
the rotary sleeve (249) is internally provided with a mounting cavity (2410), the inner wall of the mounting cavity (2410) is provided with a connecting shaft seat (2411), the connecting shaft seat (2411) is rotationally provided with a rotary bolt (2412), and the rotary bolt (2412) is rotationally connected with the end part of the lifting shaft (247) far away from the first lifting seat (244) and the second lifting seat (246).
5. The natural gas hydrate core gas content testing device according to claim 4, wherein the pressurizing structure (25) comprises a high-pressure pump (251) mounted on the clamping cylinder (21), and a temperature regulating element (252) provided on the clamping cylinder (21);
the pipe connected with the high-pressure pump (251) extends into the clamping cavity (22), and the end part of the temperature regulating element (252) extends into the clamping cavity (22).
6. The natural gas hydrate core gas content testing device according to claim 5, wherein the gas transmission member (23) comprises a gas transmission tube (231), a first mounting seat (232) arranged on the outer peripheral side of the gas transmission tube (231), and a second mounting seat (233) arranged outside the clamping cylinder chamber (21);
the outer diameter of the air transmission cylinder (231) is the same as the inner diameter of the third connecting part (263), and the first mounting seat (232) is mounted on the second mounting seat (233) through a bolt (234).
7. The natural gas hydrate core gas content testing device according to claim 6, wherein the gas supply structure (3) comprises a gas transmission tank (31), a booster pump (32) and a gas transport tank (33);
the gas transmission jar (31) output is connected with booster pump (32), booster pump (32) low reaches end is provided with gas transportation jar (33), the output of gas transportation jar (33) with be located the inlet end gas transmission spare (23) are connected, gas transmission jar (31) with between booster pump (32), booster pump (32) with between gas transportation jar (33) and gas transportation jar (33) output all is provided with ooff valve (34).
8. The natural gas hydrate core gas content testing device according to claim 7, wherein a connecting pipeline (235) is connected to the outside of the gas transmission cylinder (231), the pressure sensor (6) is connected to the connecting pipeline (235), and the output end of the gas transmission cylinder (33) is connected to the connecting pipeline (235).
9. The natural gas hydrate core gas content testing device according to claim 8, wherein the back pressure protection structure (5) comprises a fixed groove seat (51), a movable groove seat (52) movably arranged on the fixed groove seat (51), a first gas cylinder (53) arranged on the movable groove seat (52) and a second gas cylinder (54) movably arranged on the first gas cylinder (53);
the second air cylinder (54) is connected to the end part of the air delivery cylinder (231), the first pressing seat (55) is arranged on the outer peripheral side of the fixed groove seat (51), the second pressing seat (56) is arranged on the outer peripheral side of the movable groove seat (52), the first pressing seat (55) is provided with a pressure cylinder (57), the second pressing seat (56) is connected to the end part of the pressure cylinder (57), and the pressure cylinder (57) is a telescopic cylinder with a spring inside.
10. The gas content testing device of the natural gas hydrate core according to claim 9, wherein a ventilation groove (58) with gradually increased inner diameter is arranged in the movable groove seat (52), a connecting cylinder (59) is arranged on the inner side of the movable groove seat (52), the ventilation groove (58) and the connecting cylinder (59) are communicated, a side groove (510) and a central groove (511) are arranged in the fixed groove seat (51), and an opening part of the connecting cylinder (59) is opposite to the inner wall of the side groove (510);
the center groove (511) comprises a first groove section (512), a second groove section (513) and a third groove section (514) which are sequentially connected, the inner diameter of the first groove section (512) is smaller than that of the third groove section (514), the ventilation groove (58) is connected to the second groove section (513), a valve column (516) is connected to the side edge of the movable groove seat (52) through a connecting shaft (515), and the valve column (516) is matched with the second groove section (513).
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