CN108645878B - Submarine natural gas hydrate core in-situ pressure maintaining CT reaction kettle device - Google Patents
Submarine natural gas hydrate core in-situ pressure maintaining CT reaction kettle device Download PDFInfo
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- CN108645878B CN108645878B CN201810505734.3A CN201810505734A CN108645878B CN 108645878 B CN108645878 B CN 108645878B CN 201810505734 A CN201810505734 A CN 201810505734A CN 108645878 B CN108645878 B CN 108645878B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]
Abstract
The invention discloses a submarine natural gas hydrate rock core in-situ pressure maintaining CT reaction kettle device, which belongs to the technical field of natural gas hydrate nondestructive testing and reaction instruments and comprises a reaction device and a stabilizing device, wherein the reaction device comprises a feed end ball valve, a reaction kettle end ball valve, a feed reaction kettle, a stepping motor guide rail bushing, a pressure-resistant reaction kettle and a semiconductor refrigeration base, and the stabilizing device comprises a nitrogen gas cylinder, a gas ISCO pump, an intermediate container, a water bath tank, a water tank and a liquid ISCO pump; the invention can reduce the decomposition of hydrate cores, ensure the imaging quality, resist high pressure and effectively overcome the defects of the old scanning mode.
Description
Technical Field
The invention relates to the technical field of natural gas hydrate nondestructive testing and reaction instruments, in particular to a submarine natural gas hydrate rock core in-situ pressure maintaining CT reaction kettle device.
Background
In the existing research equipment for researching hydrate deposit hydrate distribution, the condition of simulating the temperature and pressure characteristics of a seabed natural gas hydrate reservoir has more problems, such as: the old CT core detection system is influenced by the metal sleeve, the imaging quality is reduced, and the transmission is unclear and double images exist; the old core CT scanning system adopts a scanning mode of rotating a core sleeve and fixing a radioactive source, and when the surface of a cylinder of the core sleeve is uneven, the CT scanning result has a virtual image and an accurate scanning image cannot be obtained; most of the existing core detection equipment has the defect of the decompression and decomposition of hydrate cores in the sample transfer process.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the submarine natural gas hydrate core in-situ pressure maintaining CT reaction kettle device which can reduce the decomposition of the hydrate core and ensure the imaging quality.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a submarine natural gas hydrate rock core normal position pressurize CT reation kettle device, includes reaction unit, and reaction unit includes: the device comprises a feed end ball valve, a reaction kettle end ball valve, a feed reaction kettle, a stepping motor guide rail bushing, a pressure-resistant reaction kettle and a semiconductor refrigeration base, wherein the reaction devices are bilaterally symmetrical; the stepping motor guide rail bushing is positioned in the reaction device and connected to one side of the stepping motor guide rail, the stepping motor is arranged on the stepping motor guide rail, and the stepping motor can move up and down on the stepping motor guide rail; the ball valve at the feeding end is positioned above the guide rail bushing of the stepping motor and clamped between the inner walls of the feeding reaction kettle; the upper end and the lower end of the pressure-resistant reaction kettle are both connected with a sample position fixing bushing through a gasket B, and the reaction kettle end ball valve is positioned above the sample position fixing bushing at the upper end of the pressure-resistant reaction kettle; the sample position fixing bush at the lower end of the pressure-resistant reaction kettle is connected with a semiconductor refrigeration base, and the pressure-resistant reaction kettle is made of PEEK materials.
Furthermore, a tail end piston is fixed on the lower surface of the semiconductor refrigeration base, and an axial sealing ring is arranged in the tail end piston.
Furthermore, an anti-blocking port is arranged below the tail end piston and connected with the tail end piston through a pipeline.
Further, the present invention also includes a stabilizing device comprising: the device comprises a nitrogen gas cylinder, a gas ISCO pump, an intermediate container, a water bath box, a water tank and a liquid ISCO pump, wherein the nitrogen gas cylinder is connected with the gas ISCO pump through a pipeline and a valve; the water bath box is communicated with the water tank, the water tank is connected with the liquid ISCO pump through a pipeline and a valve, and the liquid ISCO pump is connected with the feeding reaction kettle and the pressure-resistant reaction kettle through a pipeline and a valve.
Furthermore, the stepping motor is externally connected with a stepping motor controller.
Further, the lower end of the feeding reaction kettle is fixedly connected with one end of a gasket A, and the other end of the gasket A is fixedly connected with a stainless steel connecting sleeve.
Further, the gasket A, the feeding reaction kettle and the stainless steel connecting sleeve are fixedly connected through bolts.
Further, the gasket B is fixedly connected with the pressure-resistant reaction kettle and the sample position fixing bushing through bolts.
Furthermore, the lower surface of the semiconductor refrigeration base is externally connected with a temperature control module.
Further, a pressure maintaining water layer space is arranged on the inner wall of the pressure-resistant reaction kettle.
The invention has the beneficial effects that: the feeding reaction kettle and the pressure-resistant reaction kettle are matched, so that the decomposition of the hydrate core can be reduced to the maximum extent, the core sample sleeve can be automatically transferred by utilizing the stepping motor, and the measurement work is greatly facilitated; the pressure-resistant reaction kettle is made of PEEK materials, so that the pressure resistance is realized, and the imaging quality can be ensured; according to the invention, the core sample sleeve is fixed in the pressure-resistant reaction kettle, and the CT radioactive scanning source can rotationally scan the core sample sleeve by 360 degrees, so that the problem of imaging blurring caused by an old scanning mode of rotating the core sleeve and fixing the CT radioactive scanning source is effectively solved, a clear image is presented, the analysis and the processing of the image are facilitated, and the accuracy of an analysis conclusion is effectively improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
The reference numbers in the figures are as follows: 1. a feed end ball valve, 2, a reaction kettle end ball valve, 3, a feed reaction kettle, 4, a stepping motor guide rail bushing, 5, a stepping motor, 6, a stepping motor guide rail, 7, a sample position fixing bushing, 8, a pressure-resistant reaction kettle, 9, a semiconductor refrigeration base, 10, an anti-blocking port, 11, a gasket A, 12, a terminal piston, 13, a gasket B, 14, an axial sealing ring, 15, a pressure-maintaining water layer space, 16, a nitrogen gas cylinder, 17, a gas ISCO pump, 18, an intermediate container, 19, a water bath tank, 20, a water tank, 21, a liquid ISCO pump, 22, a stepping motor controller, 23, a stainless steel connecting sleeve, 24, a temperature control module, 25, a temperature pressure acquisition module, 26, a valve A, 27, a valve B, 28, a valve C, 29, a valve D, 30 and a valve E.
Detailed Description
The invention is further illustrated with reference to figure 1:
the utility model provides a submarine natural gas hydrate rock core normal position pressurize CT reation kettle device, includes reaction unit, and reaction unit includes: the device comprises a feed end ball valve 1, a reaction kettle end ball valve 2, a feed reaction kettle 3, a stepping motor guide rail bushing 4, a pressure-resistant reaction kettle 8 and a semiconductor refrigeration base 9, wherein the reaction device is bilaterally symmetrical; the stepping motor guide rail bushing 4 is positioned in the reaction device and connected to one side of the stepping motor guide rail 6, the stepping motor 5 is arranged on the stepping motor guide rail 6, and the stepping motor 5 can move up and down on the stepping motor guide rail 6; the feed end ball valve 1 is positioned above the guide rail bushing 4 of the stepping motor and clamped between the inner walls of the feed reaction kettle 3; the upper end and the lower end of the pressure-resistant reaction kettle 8 are both connected with a sample position fixing bush 7 through a gasket B13, and the reaction kettle end ball valve 2 is positioned above the sample position fixing bush 7 at the upper end of the pressure-resistant reaction kettle 8; the sample position fixing bush 7 at the lower end of the pressure-resistant reaction kettle 8 is connected with a semiconductor refrigeration base 9, and the pressure-resistant reaction kettle 8 is made of PEEK material.
The lower surface of the semiconductor refrigeration base 9 is fixed with a tail end piston 12, and an axial sealing ring 14 is arranged in the tail end piston 12.
An anti-blocking port 10 is arranged below the tail end piston 12, and the anti-blocking port 10 is connected with the tail end piston 12 through a pipeline, so that blocking gravel at the lower end of the tail end piston 12 can be cleaned regularly.
The invention also comprises a stabilizing device comprising: the device comprises a nitrogen gas cylinder 16, a gas ISCO pump 17, an intermediate container 18, a water bath box 19, a water tank 20 and a liquid ISCO pump 21, wherein the nitrogen gas cylinder 16 is connected with the gas ISCO pump 17 through a pipeline and a valve, the gas ISCO pump 17 is connected with the intermediate container 18 through a pipeline and a valve, and the intermediate container 18 is connected with the feeding reaction kettle 3 and the pressure-resistant reaction kettle 8 through pipelines and valves; the water bath tank 19 is connected with a water tank 20, the water tank 20 is connected with a liquid ISCO pump 21 through a pipeline and a valve, and the liquid ISCO pump 21 is connected with the feeding reaction kettle 3 and the pressure-resistant reaction kettle 8 through a pipeline and a valve.
The stepping motor 5 is externally connected with a stepping motor controller 22.
The lower end of the feeding reaction kettle 3 is fixedly connected with one end of a gasket A11, and the other end of the gasket A11 is fixedly connected with the stainless steel connecting sleeve 23.
The gasket A11 is fixedly connected with the feeding reaction kettle 3 and the stainless steel connecting sleeve 23 through bolts.
The gasket B13 is fixedly connected with the pressure-resistant reaction kettle 8 and the sample position fixing bush 7 through bolts; preferably, the gasket B13 is a high quality fluorine rubber sealing gasket.
The lower surface of the semiconductor refrigeration base 9 is also externally connected with a temperature control module 24.
The inner wall of the pressure-resistant reaction kettle 8 is provided with a pressure maintaining water layer space 15, preferably, the thickness of the pressure maintaining water layer space 15 is 2mm, and the special PEEK material for manufacturing the pressure-resistant reaction kettle 8 can be saved while the sealing performance is ensured.
The feed end ball valve 1, the feed reaction kettle 3, the stepping motor guide rail bushing 4 and the stepping motor 5 form a core feeding system, the diameter of the through hole of the feed end ball valve 1 is consistent with that of a core sample sleeve to be scanned, and the stepping motor guide rail 6 is used for ensuring that the stepping motor 5 moves along a specified route.
The reaction kettle end ball valve 2, the sample position fixing bush 7, the pressure-resistant reaction kettle 8, the semiconductor refrigeration base 9 and the tail end piston 12 form a pressure-maintaining CT scanning reaction system, the diameter of a through hole of the reaction kettle end ball valve 2 is consistent with that of a core sample sleeve to be scanned, the sample position fixing bush 7 is made of stainless steel materials, and a temperature and pressure sensor is also arranged in the pressure-resistant reaction kettle 8; the end piston 12 is a channel for discharging residual gas and liquid to the outside, the semiconductor refrigeration base 9 is fixed on the upper surface of the end piston 12, and the semiconductor refrigeration base 9 is adjusted by the temperature control module so as to control the temperature in the pressure-resistant reaction kettle 8.
The nitrogen gas cylinder 16, the gas ISCO pump 17 and the intermediate container 18 constitute a gas pressure maintaining system, the original pressure of the nitrogen gas cylinder 16 is 25Mpa, and preferably, the gas ISCO pump 17 is an inlet ISCO high-precision pump manufactured by Teledyne company; the intermediate container 18 is made of pressure-resistant stainless steel, can bear the pressure of 30Map at most, and has the function of ensuring that the internal air pressure of a core feeding system and a pressure-maintaining CT scanning reaction system is constant in the feeding process of a core sample sleeve to be scanned.
The water bath tank 19, the water tank 20 and the liquid ISCO pump 21 form a water pressure maintaining system, preferably, the water bath tank 19 is a TW12 model inlet constant temperature water bath tank manufactured by Ulibobo corporation, and the temperature control range is-25 degrees to 30 degrees; pure water or seawater is filled in the water tank 20, and a certain amount of liquid is pumped out of the water tank 20 by the liquid ISCO pump 21 and used for maintaining pressure in the pressure-resistant reaction kettle 8.
The using method of the invention is as follows:
the first step is as follows: opening the ball valve 1 at the feeding end, putting the core sample sleeve into the guide rail bushing 4 of the stepping motor, and closing the ball valve 1 at the feeding end;
the second step is that: opening a valve A26 and a valve C28, introducing 25Mpa nitrogen into the feeding reaction kettle 3 through the intermediate container 18 by using the gas ISCO pump 17 and the nitrogen gas cylinder 16, then closing the nitrogen gas cylinder 16, and observing whether the pressure indication of the temperature and pressure acquisition module 25 is stable, wherein if the pressure indication change range in ten minutes is less than 0.05Mpa, the pressure indication is considered to be stable; otherwise, checking the air leakage condition and repeating the second step;
the third step: valve a26 and valve C28 were closed;
the fourth step: opening a valve B27 and a valve D29, injecting liquid of 25Mpa into the pressure-resistant reaction kettle 8 by using the liquid ISCO pump 21 and the water tank 20, checking whether liquid leakage occurs at each joint, and if the liquid leakage does not occur, determining that the sealing is good; otherwise, carrying out fastening measures and repeating the fourth step;
the fifth step: setting the liquid ISCO pump 21 to be in a constant pressure mode of 25Mpa, opening the semiconductor refrigeration base 9, and controlling the temperature to be 1 ℃;
and a sixth step: slowly opening the ball valve 2 at the reaction kettle end, operating the stepping motor controller 22, guiding the core sample sleeve into the pressure-resistant reaction kettle 8, and closing the ball valve 2 at the reaction kettle end;
the seventh step: scanning the pressure-resistant reaction kettle 8 by using a CT scanner;
eighth step: after scanning is finished, opening a valve below the tail end piston 12, discharging residual high-pressure liquid, opening a valve A26 and a valve E30, discharging high-pressure nitrogen, opening a reaction kettle end ball valve 2 and a feed end ball valve 1, and pumping out a core sample sleeve;
the ninth step: and closing the water bath tank 19 and the stepping motor 5, and cleaning the pressure-resistant reaction kettle 8 and the stepping motor guide rail bushing 4.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. The utility model provides a submarine natural gas hydrate rock core normal position pressurize CT reation kettle device which characterized in that, including reaction unit, reaction unit includes: the device comprises a feed end ball valve (1), a reaction kettle end ball valve (2), a feed reaction kettle (3), a stepping motor guide rail bushing (4), a pressure-resistant reaction kettle (8) and a semiconductor refrigeration base (9), wherein the reaction devices are bilaterally symmetrical, and the feed reaction kettle (3) is connected with the pressure-resistant reaction kettle (8) through a stainless steel connecting sleeve (23); the stepping motor guide rail bushing (4) is positioned in the reaction device and connected to one side of the stepping motor guide rail (6), the stepping motor (5) is installed on the stepping motor guide rail (6), and the stepping motor (5) can move up and down on the stepping motor guide rail (6); the feed end ball valve (1) is positioned above the guide rail bushing (4) of the stepping motor and clamped between the inner walls of the feed reaction kettle (3); the upper end and the lower end of the pressure-resistant reaction kettle (8) are connected with a sample position fixing bush (7) through a gasket B (13), and the reaction kettle end ball valve (2) is positioned above the sample position fixing bush (7) at the upper end of the pressure-resistant reaction kettle (8); the sample position fixing bushing (7) at the lower end of the pressure-resistant reaction kettle (8) is connected with a semiconductor refrigeration base (9), and the pressure-resistant reaction kettle (8) is made of PEEK materials.
2. The submarine natural gas hydrate core in-situ pressure-maintaining CT reaction kettle device according to claim 1, wherein a terminal piston (12) is fixed on the lower surface of the semiconductor refrigeration base (9), and an axial sealing ring (14) is arranged in the terminal piston (12).
3. The submarine natural gas hydrate core in-situ pressure-maintaining CT reaction kettle device according to claim 2, wherein an anti-blocking port (10) is arranged below the end piston (12), and the anti-blocking port (10) is connected with the end piston (12) through a pipeline.
4. The subsea natural gas hydrate core in-situ pressure maintaining CT reactor device according to claim 1, further comprising a stabilizing device, the stabilizing device comprising: the device comprises a nitrogen gas cylinder (16), a gas ISCO pump (17), an intermediate container (18), a water bath box (19), a water tank (20) and a liquid ISCO pump (21), wherein the nitrogen gas cylinder (16) is connected with the gas ISCO pump (17) through a pipeline and a valve, the gas ISCO pump (17) is connected with the intermediate container (18) through a pipeline and a valve, and the intermediate container (18) is connected with a feeding reaction kettle (3) and a pressure-resistant reaction kettle (8) through a pipeline and a valve; the water bath tank (19) is communicated with a water tank (20), the water tank (20) is connected with a liquid ISCO pump (21) through a pipeline and a valve, and the liquid ISCO pump (21) is connected with the feeding reaction kettle (3) and the pressure-resistant reaction kettle (8) through a pipeline and a valve.
5. The subsea natural gas hydrate core in-situ pressure maintaining CT reactor device according to claim 1, wherein the stepping motor (5) is externally connected with a stepping motor controller (22).
6. The submarine natural gas hydrate core in-situ pressure-maintaining CT reaction kettle device according to claim 1, wherein the lower end of the feeding reaction kettle (3) is fixedly connected with one end of a gasket A (11), and the other end of the gasket A (11) is fixedly connected with a stainless steel connecting sleeve (23).
7. The subsea natural gas hydrate core in-situ pressure maintaining CT reactor device according to claim 6, wherein the gasket A (11) is fixedly connected with the feeding reactor (3) and the stainless steel connecting sleeve (23) through bolts.
8. The subsea natural gas hydrate core in-situ pressure maintaining CT reactor device according to claim 1, wherein the gasket B (13) is fixedly connected with the pressure-resistant reactor (8) and the sample position fixing bushing (7) through bolts.
9. The submarine natural gas hydrate core in-situ pressure-maintaining CT reaction kettle device according to claim 2, wherein a temperature control module (24) is further externally connected to the lower surface of the semiconductor refrigeration base (9).
10. The subsea natural gas hydrate core in-situ pressure-maintaining CT reactor device according to claim 1, wherein the pressure-maintaining water layer space (15) is arranged on the inner wall of the pressure-resistant reactor (8).
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