CN109060609B - Natural gas hydrate permeability measuring device - Google Patents
Natural gas hydrate permeability measuring device Download PDFInfo
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- CN109060609B CN109060609B CN201810949147.3A CN201810949147A CN109060609B CN 109060609 B CN109060609 B CN 109060609B CN 201810949147 A CN201810949147 A CN 201810949147A CN 109060609 B CN109060609 B CN 109060609B
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Abstract
The invention provides a natural gas hydrate permeability measuring device which comprises a penetration chamber, a temperature measuring and controlling system and an air compressor, wherein the penetration chamber comprises an outer chamber and an inner chamber, a rubber mold is arranged in the inner chamber, two permeable stones are arranged up and down and clamped in the rubber mold, a natural gas hydrate sample is wrapped by the rubber mold and clamped between the two permeable stones, a first space is formed between the side wall of the inner chamber and the side wall of the outer chamber, the temperature measuring and controlling system is communicated with the first space, a second space is formed between the side wall of the rubber mold and the side wall of the inner chamber, the air compressor is communicated with the second space through a confining pressure air inlet pipe, the air compressor is connected with the permeable stones below through the penetration system, one end of a discharge pipe is connected with the permeable stones above, the other end of the discharge pipe extends out of the penetration chamber and is respectively connected with a vacuum pump, a gas recovery device and a liquid flow measuring device, a methane gas bottle is connected with the penetration system, a gas flow meter is arranged in the penetration system, and a differential pressure measuring system is used for measuring the inlet and outlet differential pressure of the penetration chamber.
Description
Technical Field
The invention relates to the technical field of natural gas hydrate development, in particular to a device for measuring the permeability of a natural gas hydrate.
Background
Natural gas hydrate widely exists in seabed continental shelf and plateau frozen soil, and forms cage-shaped crystalline compounds under high-pressure and low-temperature environment by sufficient gas source (mainly methane) and water, and the cage-shaped crystalline compounds are mainly classified into I type and II type. Because 1 volume of natural gas hydrate can release 164 volumes of natural gas, the natural gas hydrate is considered as a clean new energy source with the most development prospect in the new century, and the reserves are extremely rich. How to safely exploit natural gas hydrate causes high attention of scientists and governments of various countries, and becomes a new hotspot for solving the energy crisis.
However, there are still many technical difficulties and environmental disasters for commercial exploitation of natural gas hydrates. Because the mining process is complex, including heat and mass transfer, decomposition phase change, multidirectional seepage, formation deformation and other processes, the formation permeability changes, the permeability reduction can seriously affect the permeability of gas in a matrix, the mining efficiency is reduced, and the mining cost is increased. In addition, if leakage occurs during mining, the influence on the overburden layer, geological disasters such as seabed landslide and the like can be caused, and irreparable loss can be caused on the marine ecosystem. It can be seen that the permeability of the gas hydrate reservoir and overburden is a key parameter in the commercial exploitation of combustible ice.
In consideration of the difficult acquisition of undisturbed rock samples and high cost, the basic physical property measurement is generally carried out by artificially synthesizing sediments in a laboratory. The hydrate deposit occurrence environmental conditions are high pressure and low temperature, and a common permeability measuring device cannot ensure the generation and stable existence of the hydrate deposit, so a special device is needed to simulate the corresponding environment.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a natural gas hydrate permeability measurement apparatus, which can ensure stable existence of a natural gas hydrate sample in an experimental process, ensure stable seepage of a gas phase or a liquid phase in the experimental process, and regulate and control parameters affecting permeability, and is simple to disassemble and easy to operate.
The embodiment of the invention provides a natural gas hydrate permeability measuring device which comprises a permeation chamber, a temperature measuring and controlling system and an air compressor, wherein the permeation chamber comprises an outer chamber and an inner chamber accommodated in the outer chamber, a rubber mold with an upper opening and a lower opening is arranged in the inner chamber, two permeable stones are arranged up and down and clamped in the rubber mold, a natural gas hydrate sample is wrapped by the rubber mold and clamped between the two permeable stones, a first space is arranged between the side wall of the inner chamber and the side wall of the outer chamber, the temperature measuring and controlling system is communicated with the first space to inject a coolant into the first space, a second space is arranged between the side wall of the rubber mold and the side wall of the inner chamber, the air compressor is communicated with the second space through a confining pressure air inlet pipe to inject gas into the second space to form a confining pressure, the air compressor is connected with the permeable stones below through a permeation system, one end of the row of air compressor is connected with the permeable stones above, the other end of the row of air compressor is connected with a vacuum pump, a gas recovery device and a liquid flow measuring device, a methane gas cylinder is connected with a gas cylinder for measuring gas flow rate, and a gas pressure difference measuring system is connected with a gas inlet and a gas outlet pipe of the permeation chamber.
Further, the infiltration system includes the gas holder, with intake pipe and the outlet duct of the upper end connection of gas holder, with outlet pipe and the infiltration admission pipe of the lower extreme connection of gas holder, the one end of infiltration admission pipe is connected simultaneously the outlet duct with the outlet pipe, the other end is connected and is located the below the permeable stone, air compressor connects first piping, and the one end of a second piping is connected the intake pipe, the other end is connected simultaneously the confined pressure intake pipe with first piping, the methane-gas cylinder is connected the intake pipe, the intake pipe the confined pressure intake pipe with all be equipped with the valve on the second piping, be equipped with on the outlet duct gas flowmeter and admission valve, be equipped with the water intaking valve on the outlet pipe, differential pressure measurement system with the discharge pipe with the infiltration admission pipe is correlated with.
Further, be equipped with on the infiltration admission pipe and be used for measuring the pressure sensor of the inlet pressure of infiltration room, be equipped with the air outlet valve on the discharge pipe and be used for measuring the pressure sensor of the pressure of giving vent to anger of infiltration room, differential pressure measurement system is including being located infiltration admission pipe with be located two on the discharge pipe pressure sensor, perhaps differential pressure measurement system is including connecting the infiltration admission pipe with the differential pressure table of discharge pipe, or simultaneously including being located infiltration admission pipe with be located two on the discharge pipe pressure sensor and connection the infiltration admission pipe with the differential pressure table of discharge pipe.
Furthermore, a pressure sensor for measuring the air pressure in the air storage tank is arranged on the air inlet pipe, and a pressure sensor for measuring the confining pressure in the second space is arranged on the confining pressure air inlet pipe; the confining pressure intake pipe the pressure sensor is located the correspondence the valve with between the infiltration room, also be equipped with a valve on the outlet duct, the gas flowmeter be located this valve with between the admission valve, and this valve is closer to the gas holder.
Further, a fourth pipe system is connected to the first pipe system, the fourth pipe system is connected with a nitrogen cylinder, and a valve is arranged on the fourth pipe system; the air compressor is connected with the first piping system through a gas pressure reducing valve, and the methane gas cylinder is connected with the gas inlet pipe through another gas pressure reducing valve.
Further, the temperature system of observing and controling includes liquid nitrogen container and circulating pump, the liquid nitrogen container passes through the third piping connection the circulating pump, the circulating pump is connected with a feed liquor pipe and a return pipe, the feed liquor pipe with the return pipe stretches into first space and branch are arranged in the relative both sides of inner room, the liquid nitrogen is in under the circulating pump the feed liquor pipe first space the return pipe with circulate between the circulating pump, the temperature system of observing and controlling still includes temperature sensor, temperature sensor locates just be connected with computer system on the inner wall of outer room.
Further, a valve is arranged on the third piping system.
Further, the permeability of the gas hydrate sample liquid phase permeation is calculated by using the formula (1), and the permeability of the gas hydrate sample gas phase permeation is calculated by using the formula (2):
in the formula: k is the gas phase or liquid phase natural gas hydrate deposit permeability; mu is the gas or liquid viscosity coefficient; l is the height of the natural gas hydrate sample; q B Is the gas flow rate; q is the liquid flow rate; p A 、P B The pressure difference measuring system is used for measuring the pressure of the permeation chamber; and A is the sectional area of the natural gas hydrate sample.
Further, a sealing ring is arranged between the permeable stone and the inner wall of the rubber mold.
Further, the confining pressure in the second space is 0-30 MPa, and the coolant makes the temperature in the infiltration chamber be-20-4 ℃.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
(1) The confining pressure in the second space is 0-30 MPa, the temperature in the infiltration chamber is controlled to be-20-4 ℃ by the coolant, the temperature is consistent with the occurrence environmental conditions of the natural gas hydrate under natural conditions, the stable existence of the natural gas hydrate sample in the experimental process can be ensured, the stable seepage of a gas phase or a liquid phase in the experimental process is ensured, and the requirement of indoor experimental research is met.
(2) The air seepage chamber adopts a double-chamber structure: the inner chamber with the outer chamber, in the outer chamber first space with the temperature is observed and controled the system connection and is used for the accuse temperature, second space in the inner chamber with air compressor is connected and is used for accuse pressure, and it is convenient not only to dismantle, still can wash after the end test, simultaneously infiltration chamber cost is cheap relatively.
(3) The gas seepage chamber is small in size and convenient to carry, can be assembled with a similar natural gas hydrate system, measures the basic water physical property of the natural gas hydrate, and lays a foundation for further model experiments.
(4) The temperature measurement and control system can quickly and accurately control the temperature; the permeation system can quickly and accurately control the air inlet pressure and the pressure difference; the air compressor can quickly and accurately control confining pressure; according to the elements and the system, corresponding parameters are regulated and controlled, and the influence rule and sensitivity of the elements and the system on the permeability of the natural gas hydrate deposit layer are researched, so that a solid foundation is provided for the safe exploitation of the natural gas hydrate.
Drawings
FIG. 1 is an overall schematic view of a gas hydrate permeability measuring apparatus according to the present invention;
fig. 2 is a schematic view of a permeation chamber of the natural gas hydrate permeability measurement apparatus of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a natural gas hydrate permeability measurement apparatus, including a permeation chamber 9, a temperature measurement and control system, an air compressor 14, and a discharge pipe 35, where the temperature measurement and control system is connected to the permeation chamber 9 to measure and control the temperature of the permeation chamber 9, the air compressor 14 is connected to the permeation chamber 9 to provide a suitable confining pressure for the permeation chamber 9, and a natural environment is simulated by the temperature measurement and control system and the confining pressure to ensure stable existence of a natural gas hydrate sample 25 in an experimental process. Both the infiltration system and the discharge pipe 35 are connected to the infiltration chamber 9 to ensure a stable infiltration of gas or liquid phase during the experiment.
Referring to fig. 1 and 2, the infiltration chamber 9 includes an outer chamber 22 and an inner chamber 23 accommodated in the outer chamber 22, the outer chamber 22 is closed at the top and bottom, the bottom wall is mounted on a base 26, and a pressing plate 21 is pressed on the top wall of the outer chamber 22. Temperature measurement and control system includes temperature sensor 20, temperature sensor 20 locates on the lateral wall inboard of ectotheca 22 and be connected with computer system 19, temperature sensor 20 can detect the temperature of ectotheca 22 and the temperature that will detect reach computer system 19 shows. The inner chamber 23 is closed at the top and the bottom, the bottom wall of the inner chamber 23 is connected with the bottom wall of the outer chamber 22 and is located at the center of the bottom wall of the outer chamber 22, a gap is formed between the top wall of the inner chamber 23 and the top wall of the outer chamber 22, a gap is also formed between the side wall of the inner chamber 23 and the side wall of the outer chamber 22, and the gap between the side wall of the inner chamber 23 and the side wall of the outer chamber 22 and the gap between the top wall of the inner chamber 23 and the top wall of the outer chamber 22 jointly form a first space. 304 stainless steel is adopted as a material for the outer chamber 22 and the inner chamber 23, the height of the outer chamber 22 is 35cm, the height of the inner chamber 23 is 20cm, and the outer chamber 22 and the inner chamber 23 resist the pressure of 30MPa.
The inner chamber 23 is provided with a rubber mold 41 with an upper opening and a lower opening, the two permeable stones 24a and 24b are arranged up and down and clamped in the rubber mold 41, the natural gas hydrate sample 25 is wrapped by the rubber mold 41 and clamped between the two permeable stones 24a and 24b, and a sealing ring is arranged between each permeable stone 24a and 24b and the inner wall of the rubber mold 41 to prevent gas and liquid from passing through the edges of the permeable stones 24a and 24 b. The gas hydrate sample 25 is a cylinder with a height of 80mm and a diameter of 40 mm. The two permeable stones 24a, 24b are located inside the rubber mold 41, and each permeable stone 24a, 24b has an appropriate distance with the corresponding opening of the rubber mold 41. The lower end of the rubber mold 41 is connected to the bottom wall of the inner chamber 23 and is located at the center of the bottom wall of the inner chamber 23, a space is provided between the upper end of the rubber mold 41 and the top wall of the inner chamber 23, a space is also provided between the side wall of the rubber mold 41 and the side wall of the inner chamber 23, and the space between the side wall and the top wall of the rubber mold 41 and the side wall and the top wall of the inner chamber 23 form a second space.
A lower end of a reinforcing pipe 42 passes through the top wall of the inner chamber 23 downward and extends to an upper end opening of the rubber mold 41, an upper end of the reinforcing pipe 42 passes through the top wall of the outer chamber 22 and the pressing plate 21 upward in sequence and emerges from the pressing plate 21, one end of the discharge pipe 35 passes through the inside of the reinforcing pipe 42 and then continues to extend downward until being connected with the water-permeable stone 24a located above, and the other end of the discharge pipe 35 extends outward and is respectively connected with a vacuum pump 16, a gas recovery device 17 and a liquid flow measuring device, which is a measuring cylinder 18, through a three-way valve.
The temperature measurement and control system further comprises a liquid nitrogen tank 12 and a circulating pump 11, the liquid nitrogen tank 12 is connected with the circulating pump 11 through a third pipe system 33, so that coolant liquid nitrogen is provided for the circulating pump 11, the circulating pump 11 is connected with a liquid inlet pipe 27 and a return pipe 28, the liquid inlet pipe 27 and the return pipe 28 penetrate through the base 26 and extend into the first space, the outlet end of the first space is respectively arranged at two opposite sides of the inner chamber 23, and the liquid nitrogen circulates in the liquid inlet pipe 27, the first space, the return pipe 28 and the circulating pump 11 under the action of the circulating pump 11. The temperature of the infiltration chamber 9 is regulated and controlled by the circulation speed of the liquid nitrogen, so that the temperature of the infiltration chamber 9 is kept between-20 ℃ and 4 ℃. The third piping system 33 is provided with a valve 3f, and when the valve 3f is closed, the liquid nitrogen tank 12 stops supplying the liquid nitrogen.
The lower end of a confining pressure air inlet pipe 29 sequentially penetrates through the pressure plate 21, the top wall of the outer chamber 22 and the top wall of the inner chamber 23 to extend into the second space, the air compressor 14 is sequentially connected with the upper end of the confining pressure air inlet pipe 29 through a pressure reducing valve 2b and a first pipe system 31, and therefore the air compressor 14 can inject air into the second space through the confining pressure air inlet pipe 29 according to needs to enable the second space to have certain confining pressure, and the confining pressure is 0-30 MPa. Be equipped with on the confined pressure intake pipe 29 and be used for measuring in the second space confined pressure's pressure sensor 4c still is equipped with valve 3d, on the confined pressure intake pipe 29 pressure sensor 4c is located on the confined pressure intake pipe 29 valve 3d with between the infiltration room 9.
One end of a second piping system 32 is simultaneously connected with the first piping system 31 and the confining pressure air inlet pipe 29, the other end of the second piping system 32 is connected with the permeation system, and the second piping system 32 is also provided with a valve 3c.
The infiltration system includes the gas holder 5, with intake pipe and outlet duct 37 that the upper end of gas holder 5 is connected, with outlet pipe 36 and infiltration admission pipe 38 that the lower extreme of gas holder 5 is connected, the one end of infiltration admission pipe 38 is connected simultaneously the outlet duct 37 with outlet duct 36, the other end connection is located the below permeable stone 24b, second piping system 32 is connected the intake pipe, a methane gas bottle 1 is connected through the relief pressure valve 2a that corresponds the intake pipe. The air inlet pipe is also provided with a valve 3a and a pressure sensor 4a for measuring the air pressure in the air storage tank 5. The gas outlet pipe 37 is provided with the gas flowmeter 6, the gas inlet valve 7 and a valve 3b, the gas flowmeter 6 is positioned between the valve 3b and the gas inlet valve 7, and the valve 7 is closer to the gas storage tank 6. The water outlet pipe 36 is provided with a water inlet valve 8, and the gas flow meter 6 is used for measuring the gas flow in the gas outlet pipe 37.
A differential pressure measurement system is associated with the discharge pipe 35 and the permeate system to measure the pressure differential in and out of the permeate chamber. Specifically, be equipped with on the infiltration admission pipe 38 and be used for measuring the inlet pressure's of infiltration room 9 pressure sensor 4b, be equipped with on the discharge pipe 35 go out gas valve 13 and be used for measuring the pressure sensor 4d of the pressure of giving vent to anger of infiltration room 9, the differential pressure measurement system is including being located infiltration admission pipe 38 with be located two on the discharge pipe 35 pressure sensor 4b, 4d, or the differential pressure measurement system is including connecting infiltration admission pipe 38 with the pressure difference table 10 of discharge pipe 35, or simultaneously including being located infiltration admission pipe 38 with be located two on the discharge pipe 35 pressure sensor 4b, 4d and connect infiltration admission pipe 38 with the pressure difference table 10 of discharge pipe 35. In this embodiment, the differential pressure measuring system includes two pressure sensors 4b and 4d on the permeate inlet pipe 38 and the discharge pipe 35, and a differential pressure gauge 10 connecting the permeate inlet pipe 38 and the discharge pipe 35. The differential pressure gauge 10 can directly measure the differential pressure between the discharge pipe 35 and the permeate inlet pipe 38.
The first piping system 31 is connected with a fourth piping system 34, the fourth piping system 34 is connected with the nitrogen gas cylinder 15, and the fourth piping system 34 is provided with a valve 3e.
The process of placing the natural gas hydrate sample 25 into the permeation chamber 9 in the natural gas hydrate permeability measurement device according to the present invention is as follows: after the prepared natural gas hydrate sample 25 is packaged by the rubber mold 41, the upper end and the lower end of the sample are respectively capped and bottomed by the two permeable stones 24a and 24b, and then the sealing rings are sleeved around the permeable stones 24a and 24b to prevent gas and liquid from passing through the edges of the permeable stones 24a and 24 b. The rubber mold 41 is placed into the inner chamber 23, the inner chamber 23 is assembled with the outer chamber 22 and the base 26, and finally other system pipes and lines are connected. The permeation chamber can then be used to perform either gas permeation experiments or water permeation experiments.
The infiltration chamber 9 in the natural gas hydrate permeability measurement device is a detachable device, and when the device is used, the device is assembled according to the flow, and when the device is not used, the device is detached according to the flow opposite to the flow, so that the infiltration chamber is convenient to store and carry, and is convenient to clean and clean after being used, the infiltration chamber 9 is convenient to maintain and maintain, the service life of the infiltration chamber is longer, the clean infiltration chamber 9 is kept, the experimental effect of the experiment and the next experiment cannot be influenced, and the accuracy and the reliability of the experimental result are improved.
When the device for measuring the permeability of the natural gas hydrate is used for water seepage experiments:
preferably, the valves 3e of the nitrogen gas cylinder 15 and the fourth piping system 34 are opened, and the nitrogen gas in the nitrogen gas cylinder 15 is used to check the tightness of the entire natural gas hydrate permeability measurement device. After the tightness is confirmed to be correct, the liquid nitrogen tank 12 is opened, a coolant (liquid nitrogen) is introduced into the first space 22 through the valve 3f on the third piping system 33 by the circulating pump 11, the temperature required by the test is guaranteed to be-20-4 ℃, and the temperature is read by the temperature sensor 20 and is transmitted to the computer system 19 to be displayed; injecting a certain amount of distilled water into the lower part of the gas storage tank 5, wherein the water amount is about 1/5 of the volume of the gas storage tank 5; then, by connecting the discharge pipe 35 to the vacuum pump 16, the outlet valve 13 is opened, and the inlet valve 7 and the inlet valve 8 are closed; turning on the vacuum pump 16, vacuumizing for half an hour to enable the inner chamber 23 to reach a vacuum state, keeping the upper part of the inner chamber evacuated all the time, turning on the water inlet valve 8, absorbing water to saturate the natural gas hydrate sample 25, and enabling no gas phase to exist in the natural gas hydrate sample 25; closing the gas outlet valve 13, storing a sufficient amount of distilled water into the gas storage tank 5 again, opening the air compressor 14, and pumping a certain pressure into the gas storage tank 5 through the corresponding pressure reducing valve 2b, the valve 3c on the second pipe system 32 and the valve 3a on the gas inlet pipe, so that the distilled water can flow through the natural gas hydrate sample 25 and is discharged through the discharge pipe 35; and (3) closing the vacuum pump 16, connecting the discharge pipe 35 with a rubber pipeline, inserting the rubber pipeline into the measuring cylinder 18, and recording the liquid flow rate after the outflow water speed is stable.
When the gas permeability measuring device of the invention is used for gas permeation experiments:
the valves 3e on the nitrogen gas cylinder 15 and the fourth piping 34 were opened, and the tightness of the entire natural gas hydrate permeability measurement device was checked using the nitrogen gas in the nitrogen gas cylinder 15. After the tightness is confirmed to be correct, the liquid nitrogen tank 12 is opened, a coolant (liquid nitrogen) is introduced into the first space 22 through the valve 3f on the third piping system 33 by the circulating pump 11, the temperature required by the test is guaranteed to be-20-4 ℃, and the temperature is read by the temperature sensor 20 and is transmitted to the computer system 19 to be displayed; opening a valve 3d on the ambient pressure inlet pipe 29, and injecting air with a certain pressure into the inner chamber 23 through the air compressor 14 and a pressure reducing valve 2b corresponding to the air compressor 14 as the ambient pressure, wherein the pressure is measured by a pressure sensor 4c on the ambient pressure inlet pipe 29; connecting the discharge pipe 31 with the gas recovery device 17, opening the gas outlet valve 13, and measuring the pressure by a pressure sensor 4d on the discharge pipe 31, wherein the pressure is the gas outlet pressure of the gas permeation chamber 9; then, a valve 3a on the air inlet pipe is opened, gas with certain pressure is pumped into the gas storage tank 5 by the methane gas bottle 1 through a corresponding pressure reducing valve 2a, and the pressure is measured by a pressure sensor 4a on the air inlet pipe; closing a valve 3d on the confining pressure air inlet pipe 29, wherein the confining pressure is kept fixed, opening a valve 3c on the second pipe system 32, a valve 3b on the air outlet pipe 37 and the air inlet valve 7, so that the lower part of the air infiltration chamber 9 is communicated with the upper part of the air storage tank 5, pumping a set pressure into the air storage tank 5 through the air compressor 14, wherein the pressure is measured by a pressure sensor 4b on the infiltration inlet pipe 38, and the pressure is the air inlet pressure of the air infiltration chamber; and after the pressure is stable, maintaining a certain air pressure to perform an air permeation test, observing the change of the gas flow in the air outlet pipe 37 along with time, drawing a real-time gas flow curve until the gas flow is stable, obtaining the stable flow of the natural gas hydrate sample 25 under the given confining pressure and the differential pressure at two ends of the natural gas hydrate sample 25, and reading the gas flow through the gas flow meter 6.
The permeability of the gas hydrate sample liquid phase permeation 25 is calculated by using the formula (1), and the permeability of the gas hydrate sample gas phase permeation 25 is calculated by using the formula (2):
in the formula: k is the permeability of the gas or liquid phase natural gas hydrate sample 25; mu is the gas or liquid viscosity coefficient; l is the height of the natural gas hydrate sample; q B Is the gas flow rate; q is the liquid flow rate; p is A 、P B The inlet pressure and the outlet pressure of the permeation chamber 9 measured by the differential pressure measuring system are measured respectively; and a is the cross-sectional area of natural gas hydrate sample 25. The height and the cross-sectional area of the natural gas hydrate sample 25 have a uniform size; the gas flow rate is obtained by the gas flow meter 6; the liquid flow is obtained by the measuring cylinder 18; the viscosity coefficient of a gas or liquid can be queried by experimental manuals. By using the device for measuring the permeability of the natural gas hydrate, the water seepage experiment and the gas seepage experiment are carried out by changing the temperature of the infiltration chamber 9, the saturation of the natural gas hydrate sample 25, the confining pressure of the infiltration chamber 9 and other parameters, so that the influence rule and sensitivity of various parameters on the permeability of natural gas hydrate sediments are observed.
The natural gas hydrate permeability measuring device can complete the test of measuring the gas phase or liquid phase permeability of the natural gas hydrate sediment (natural gas hydrate sample 25). In addition, by regulating and controlling a plurality of parameter variables, the gas (liquid) permeation, diffusion and mechanism in the natural gas hydrate deposit can be analyzed, and the influence rule and sensitivity of various parameters on the permeability of the natural gas hydrate deposit are observed, so that a basis is provided for the safe exploitation and seabed landslide evaluation modes of the natural gas hydrate.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A natural gas hydrate permeability measuring device is characterized in that: including infiltration room, temperature measurement and control system and air compressor, the infiltration room include the ectotheca and accept in inner room in the ectotheca, open-ended rubber mold about being equipped with in the inner room, two permeable stones set up from top to bottom and block in the rubber mold, the natural gas hydrate sample by rubber mold parcel and block between two permeable stones, the lateral wall of inner room with first space has between the lateral wall of ectotheca, the temperature measurement and control system with first space intercommunication in order to first space injection coolant, the lateral wall of rubber mold with the second space has between the lateral wall of inner room, air compressor passes through confined pressure intake pipe intercommunication the second space in order to the second space injection gas forms certain confined pressure, the air compressor is connected through the infiltration system and is located the below permeable stone, a discharge pipe one end connect be located the top permeable stone, the other end stretches out the infiltration room and connect vacuum pump, gas recovery unit and liquid recovery unit respectively through the three-way valve, a methane connects the infiltration system, be equipped with the gas pressure differential measurement system with the discharge pipe with the gas cylinder of infiltration system is in order to measure the differential pressure meter.
2. The gas hydrate permeability measuring device according to claim 1, characterized in that: the infiltration system comprises a gas storage tank, a gas inlet pipe and a gas outlet pipe which are connected with the upper end of the gas storage tank, a water outlet pipe connected with the lower end of the gas storage tank and an infiltration inlet pipe, wherein one end of the infiltration inlet pipe is connected with the gas outlet pipe and the water outlet pipe simultaneously, the other end of the infiltration inlet pipe is connected with the permeable stone positioned below, an air compressor is connected with a first pipe system, one end of a second pipe system is connected with the gas inlet pipe, the other end of the infiltration inlet pipe is connected with a confining pressure gas inlet pipe and the first pipe system, a methane gas cylinder is connected with the gas inlet pipe, the confining pressure gas inlet pipe and the second pipe system are provided with valves, the gas flowmeter and the gas inlet valve are arranged on the gas outlet pipe, and the water inlet valve is arranged on the water outlet pipe, and the differential pressure measurement system is associated with the discharge pipe and the infiltration inlet pipe.
3. The gas hydrate permeability measuring device according to claim 2, characterized in that: be equipped with on the infiltration admission pipe and be used for measuring the pressure sensor of the inlet pressure of infiltration room, be equipped with the air outlet valve on the discharge pipe and be used for measuring the pressure sensor of the pressure of giving vent to anger of infiltration room, pressure differential measurement system is including being located the infiltration admission pipe with be located two on the discharge pipe pressure sensor, perhaps pressure differential measurement system is including connecting the infiltration admission pipe with the pressure differential table of discharge pipe, perhaps including being located simultaneously the infiltration admission pipe with be located two on the discharge pipe pressure sensor and connection the infiltration admission pipe with the pressure differential table of discharge pipe.
4. The gas hydrate permeability measuring apparatus according to claim 2, wherein: the air inlet pipe is provided with a pressure sensor for measuring the air pressure in the air storage tank, and the confining pressure air inlet pipe is provided with a pressure sensor for measuring the confining pressure in the second space; the confining pressure intake pipe the pressure sensor is located the correspondence the valve with between the infiltration room, also be equipped with a valve on the outlet duct, the gas flowmeter be located this valve with between the admission valve, and this valve is closer to the gas holder.
5. The gas hydrate permeability measuring apparatus according to claim 2, wherein: the first pipe system is connected with a fourth pipe system, the fourth pipe system is connected with a nitrogen cylinder, and a valve is arranged on the fourth pipe system; the air compressor is connected with the first piping system through a gas pressure reducing valve, and the methane gas cylinder is connected with the gas inlet pipe through another gas pressure reducing valve.
6. The gas hydrate permeability measuring device according to claim 1, characterized in that: the temperature system of observing and controling includes liquid nitrogen container and circulating pump, the liquid nitrogen container passes through the third piping connection the circulating pump, the circulating pump is connected with a feed liquor pipe and a return pipe, the feed liquor pipe with the return pipe stretches into first space and branch are arranged in the relative both sides of inner room, the liquid nitrogen is in under the circulating pump's effect the feed liquor pipe first space the return pipe with circulate between the circulating pump, the temperature system of observing and controlling still includes temperature sensor, temperature sensor locates just be connected with computer system on the inner wall of outer room.
7. The gas hydrate permeability measuring device according to claim 6, wherein: and a valve is arranged on the third pipe system.
8. The gas hydrate permeability measuring apparatus according to claim 1, wherein: calculating the liquid phase permeability of the natural gas hydrate sample by using a formula (1), and calculating the gas phase permeability of the natural gas hydrate sample by using a formula (2):
in the formula: k is the gas phase or liquid phase natural gas hydrate deposit permeability; mu is the gas or liquid viscosity coefficient; l is the height of the natural gas hydrate sample; q B Is the gas flow rate; q is the liquid flow rate; p is A 、P B The pressure difference measuring system is used for measuring the pressure of the permeation chamber; and A is the sectional area of the natural gas hydrate sample.
9. The gas hydrate permeability measuring device according to claim 1, characterized in that: and a sealing ring is arranged between the permeable stone and the inner wall of the rubber mold.
10. The gas hydrate permeability measuring device according to claim 1, characterized in that: the confining pressure in the second space is 0-30 MPa, and the coolant makes the temperature in the infiltration chamber be-20-4 ℃.
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| CN111735751B (en) * | 2020-08-07 | 2023-04-11 | 中国海洋石油集团有限公司 | Hydrate core permeability double-measurement device and method |
| CN113188973B (en) * | 2021-04-29 | 2023-11-17 | 哈尔滨工程大学 | Device and method for measuring permeability evolution characteristics of hydrate deposit layers with different occurrence forms |
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| KR101248531B1 (en) * | 2011-12-05 | 2013-04-03 | 한국지질자원연구원 | Apparatus and method for measuring porosity and permeability of dioxide carbon underground storage medium |
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