CN109540762B - Hydrate deposit permeability testing device - Google Patents

Hydrate deposit permeability testing device Download PDF

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Publication number
CN109540762B
CN109540762B CN201811340813.XA CN201811340813A CN109540762B CN 109540762 B CN109540762 B CN 109540762B CN 201811340813 A CN201811340813 A CN 201811340813A CN 109540762 B CN109540762 B CN 109540762B
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pressure
shell
outlet
inlet
loading
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CN109540762A (en
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李栋梁
王哲
梁德青
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Guangzhou Institute of Energy Conversion of CAS
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Guangzhou Institute of Energy Conversion of CAS
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Abstract

The invention discloses a hydrate sediment permeability testing device which comprises a reaction kettle, a constant-pressure air inlet system, a water inlet system, an outlet pressure control system, a confining pressure loading system, a ground stress loading system, a data acquisition system, a vacuumizing system and a temperature control system, wherein the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuumizing system and the temperature control system are connected; the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuumizing system and the temperature control system are all connected with a computer. The invention improves the reliability, pressure resistance, observability and economy of the natural gas hydrate permeability testing device, namely easier operation, higher design pressure and change in the observable experimental process.

Description

Hydrate deposit permeability testing device
Technical Field
The invention relates to a permeability testing device, in particular to a hydrate deposit permeability testing device under the conditions of high pressure, low temperature and three shafts.
Background
The natural gas hydrate is a solid compound with the appearance similar to ice, and is a compound with a cage-like structure formed by low-molecular-weight gas (mainly hydrocarbon molecules, such as methane, ethane and the like, and small-molecular-weight gas such as carbon dioxide, hydrogen sulfide and the like) and water molecules under the conditions of low temperature and high pressure. Natural gas hydrates formed mainly from methane gas are dominant in nature and are generally called as combustible ice because of their appearance similar to ice. Methane hydrate is mainly stored in submarine deep water land slope environment and land permafrost region. The natural gas hydrate can be released to 164-180 m under the standard state3And methane gas of 0.87m3The water of (2). According to conservative estimation, the content of the natural gas hydrate in nature is 21 multiplied by 10m3This is almost twice the known fossil energy on earth, and is considered an ideal alternative to the fossil energy in the 21 st century.
In 2007, 2015 and 2016, the Chinese geological survey bureau successively carries out 3 times of hydrate drilling in the Shenhu sea area, obtains high-saturation diffusion type hydrates in a low-permeability clay silt reservoir, and defines 10 high-grade ore bodies, wherein the thickness of the hydrate layer is up to 80m at most, and the maximum saturation is up to 75%. In 5 months in 2017, the Chinese geological survey bureau carries out first natural gas hydrate trial exploitation in the south China sea Shenhu sea area, continuous gas trial ignition is carried out for 60 days, gas production is accumulated by 30.9 ten thousand meters 3, average daily gas production is 5151m3, and the highest methane content is 99.5%. Meanwhile, the China oceanic oil company adopts a solid-state fluidization exploitation technology in the gulf sea area of the south China sea litchi to realize exploitation of deep-water shallow non-diagenetic natural gas hydrate. With the continuous success of pilot mining, commercial exploitation of natural gas hydrates has also been planned for major developed countries, such as japan, the united states, etc.
However, evaluation of natural gas hydrate development potential, evaluation of production economy, evaluation of production safety, selection of production process and the like all depend on clear knowledge of geological features of a natural gas hydrate reservoir, and the geological features of the reservoir mainly comprise reservoir temperature, pressure, saturation, porosity, permeability and the like. The temperature, the pressure and the like can obtain detailed data in exploration such as well drilling, the field permeability measurement is complex, the interference factors are more, accurate and effective permeability parameters are difficult to obtain, and meanwhile, the research on the permeability of the hydrate-containing stratum is less. In addition, before the commercial exploitation of the natural gas hydrate, the reservoir geological characteristics of the natural gas hydrate, including the permeability and the change rule of the permeability in the exploitation process, must be deeply and thoroughly understood, so that the damage to the hydrate reservoir in the exploitation process and the influence on a seabed structure can be correctly evaluated, and the serious consequences caused by blind exploitation of the hydrate are reduced to the maximum extent.
In recent years, many research institutions at home and abroad research the in-situ generation technology of the hydrate and design and manufacture devices for testing the mechanical properties of hydrate sediments, wherein many of the research institutions are equipment for measuring the permeability of the hydrate sediments. The core component of the in-situ permeability device of the hydrate deposit is a reaction kettle, and the reaction kettle can realize synthesis, shearing and decomposition of hydrate in the deposit. The bottom of present reation kettle can be realized admitting air or the top admits air, and some have still realized bottom and top and admit air simultaneously, but top and bottom adopt the pressure-resistant hose connection mostly, and the pressure-resistant is not high in the whole, and reveals very easily, just can make the experiment before the success abandoning a little improper operation, leads to the experimental facilities design pressure of present report very high, but few experimental data under the high pressure (be greater than 10MPa) report. The pressure-resistant hose connection is damaged very easily, and equipment needs frequent maintenance, and the dress appearance is troublesome, and the operation need be strictly according to the operation chapter journey, sometimes still can not single-man operation, and single-man operation hardly guarantees the sample and installs perpendicularly. The inner end cover and the base of a small part of reaction kettle are connected by a metal capillary, the capillary solves the problems of pressure resistance and sealing, but the capillary is easy to block due to the use of sediments. In addition, the currently reported devices are all closed reaction chambers, and the change of hydrate deposits in the experimental process cannot be observed.
Disclosure of Invention
The invention aims to provide a device for testing the permeability of a hydrate deposit, which can improve the reliability, pressure resistance, observability and economy of a natural gas hydrate permeability testing device.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a hydrate deposit permeability testing device comprises a reaction kettle, a constant-pressure air inlet system, a water inlet system, an outlet pressure control system, a confining pressure loading system, a ground stress loading system, a data acquisition system, a vacuumizing system and a temperature control system, wherein the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuumizing system and the temperature control system are connected; the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuumizing system and the temperature control system are all connected with a computer;
the reaction kettle comprises an outer frame, a suspension wire motor, a guide rod, a shell, a base, pulleys and a suspension wire, wherein the shell is a cylinder with a closed top surface, a lower flange is arranged on the bottom surface of the shell, the shell is fixedly connected with the top surface of the base through the lower flange to form a closed reaction kettle inner cavity, the outer frame comprises a bottom plate, two vertical rods arranged on the bottom plate at intervals, a lower cross rod connected to the middle parts of the two vertical rods and an upper cross rod connected to the tops of the two vertical rods, an upper flange is arranged on the top surface of the shell, the two guide rods are respectively arranged on two sides of the shell, the lower end of each guide rod is connected with the bottom plate of the outer frame, the upper end of each guide rod penetrates through the upper flange of the shell and then is connected with the lower cross rod of the outer frame, the suspension wire motor is arranged on the upper cross rod of the outer frame, the lower end of the suspension, the pulley is arranged on the bottom surface of the base, and the base is placed on the bottom plate of the outer frame through the pulley;
the ground stress loading system comprises a screw motor, a screw, a first coupler and a force transmission shaft, wherein the screw motor is arranged on a lower cross bar of the outer frame, the upper end of the screw is connected with the screw motor, the lower end of the screw is connected with the upper end of the force transmission shaft through the first coupler, and the lower end of the force transmission shaft penetrates through the top surface of the shell and then extends into the inner cavity of the reaction kettle;
the top surface of base is equipped with ascending boss, the lower terminal surface of power transmission axle is equipped with decurrent boss be provided with the transparent rubber cover in the reation kettle inner chamber, and the boss of base and power transmission axle are established respectively to the both ends of transparent rubber cover, constitute the sample chamber of placing the sample, all be equipped with the exit with sample chamber intercommunication on base and the power transmission axle, transparent window has been seted up to the shell side.
Further, the outlet pressure control system comprises a booster pump, an outlet buffer tank, a third pressure gauge and a fifth pressure reducing valve, wherein the outlet buffer tank is connected with the booster pump, and the booster pump is communicated with the inlet and the outlet of the base after passing through the third pressure gauge and the fifth pressure reducing valve in sequence.
Further, the booster pump include motor, gear, take tooth swivel nut, afterburning screw rod, second coupling, piston and cylinder body, the gear is installed on the output shaft of motor, take tooth swivel nut and gear mesh mutually, afterburning screw rod and take tooth swivel nut spiro union, afterburning screw rod is established the piston connection on the cylinder body through second coupling and cover, still be equipped with the second displacement sensor that is used for detecting piston displacement on the cylinder body, the pressure sensor that is used for detecting cylinder body pressure, the gas-liquid exit of being connected with the third manometer, the buffer tank interface of being connected with export buffer tank.
Further, the vacuum pumping system comprises a vacuum pump and a second pressure reducing valve, and the vacuum pump is communicated with the inlet and the outlet of the force transmission shaft through the second pressure reducing valve.
Further, the constant pressure air inlet system include the gas cylinder, sixth relief pressure valve, first manometer, third relief pressure valve, constant pressure pump and import buffer tank, import buffer tank connects on the constant pressure pump, the constant pressure pump is connected between sixth relief pressure valve and first manometer, the gas cylinder communicates with the exit of power transmission shaft behind sixth relief pressure valve, first manometer, the third relief pressure valve in proper order, still include an import and export pressure differential sensor, its one end is connected on the pipeline between third relief pressure valve and power transmission shaft import and export, the other end is connected on the looks pipeline between fifth relief pressure valve and base import and export.
Further, confining pressure loading system include confining pressure liquid loading device, first relief pressure valve, electronic booster pump, second manometer and fourth relief pressure valve, the side of shell has been seted up and has been imported and exported, confining pressure liquid loading device passes through the import and export intercommunication of first relief pressure valve with the shell, electronic booster pump communicates through the import and export of second manometer, fourth relief pressure valve with the shell in proper order.
Furthermore, the data acquisition system include with computer connection the data acquisition board, install at the shell top and extend to temperature sensor and confined pressure sensor in the reation kettle inner chamber, install the ground stress sensor on first shaft coupling, install the first displacement sensor between sheer pole and shell, temperature sensor, confined pressure sensor, ground stress sensor and first displacement sensor all are connected with the data acquisition board.
Further, the temperature control system is an air bath.
Furthermore, a metal gasket, a metal filter screen and filter paper are arranged in the sample cavity, and two ends of the sample are respectively connected with the boss of the base and the boss of the force transmission shaft after sequentially passing through the filter paper, the metal filter screen and the metal gasket.
Compared with the prior art, the invention has the following advantages:
1. through the motor control shell and the lifting of the force transmission shaft, the disturbance to the hydrate-containing sediment sample in the sample loading process can be avoided, the concentric rubber sleeve is guaranteed to be prevented from being cut, the labor force can be saved, and the working efficiency is improved.
2. The design pressure range of the reaction kettle is 0-30 MPa, the system working temperature and the design temperature range of the reaction kettle are-30-50 ℃, and the temperature and pressure conditions of the natural gas hydrate in the seabed and frozen soil area can be simulated.
3. The reaction kettle is provided with a transparent window and a transparent rubber sleeve is used for surrounding the sample, so that the change of the sample in the experimental process can be observed.
Drawings
FIG. 1 is a schematic diagram of the operation of the permeability testing apparatus of the present invention;
FIG. 2 is a schematic structural diagram of the permeability testing apparatus of the present invention, in which a reaction vessel is a front view;
FIG. 3 is a side view of a reactor of the present invention;
FIG. 4 is a schematic view of the construction of the booster pump of the present invention;
description of reference numerals: 1-a computer; 2-a data acquisition board; 3-an outer frame; 4-a suspension wire motor; 5-a screw motor; 6-screw rod; 7-a temperature sensor; 8-confining pressure sensor; 9-a first displacement sensor; 10-confining pressure liquid loading device; 11-a guide bar; 12-a housing; 13-a base; 14-flange joint screws; 15-sample; 16-a pulley; 17-a sealing ring; 18-a motor support; 19-suspension wire; 20-a roller; 21-a first coupling; 22-a ground stress sensor; 23-a vacuum pump; 24 a booster pump; 25-electric booster pump; 26-a constant pressure pump; 27-a gas cylinder; 28-inlet buffer tank; 29-outlet buffer tank; 30-inlet and outlet differential pressure sensor; 31-a force transmission shaft; 32-air bath; 33-a metal gasket; 34-a metal screen; 35-filter paper; 36-a metal sleeve; 37-transparent rubber sleeve; 38-a retaining clip; 39-transparent window; 40-a motor; 41-gear; 42-stress screw; 43-a second coupling; 44-a second displacement sensor; 45-pressure sensor; 46-a fifth pressure gauge; 47-gas liquid inlet and outlet; 48-buffer tank interface; f1 — first pressure relief valve; f2 — second pressure relief valve; f3 — third pressure relief valve; f4 — fourth pressure relief valve; f5-fifth pressure relief valve; f6 — sixth pressure relief valve; p1-first pressure gauge; p2-second pressure gauge; p3-third pressure gauge.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 4, a hydrate deposit permeability testing device comprises a reaction kettle, a constant pressure air inlet system, a water inlet system, an outlet pressure control system, a confining pressure loading system, a ground stress loading system, a data acquisition system, a vacuum pumping system and a temperature control system, wherein the constant pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuum pumping system and the temperature control system are; the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuumizing system and the temperature control system are all connected with the computer 1.
Referring to fig. 2 and 3, the reaction kettle includes an outer frame 3, a suspension wire motor 4, a guide rod 11, a housing 12, a base 13, a pulley 16 and a suspension wire 19. The shell 12 is a cylinder with a closed top surface and an open bottom surface, the bottom surface of the shell 12 is provided with a lower flange, and the lower flange is fixedly connected with the top surface of the base 13 through a flange connecting screw 14 and a sealing ring 17 to form a closed inner cavity of the reaction kettle. The outer frame 3 comprises a bottom plate, two vertical rods arranged on the bottom plate at intervals, a lower cross rod connected to the middle parts of the two vertical rods, and an upper cross rod connected to the tops of the two vertical rods. The top surface of the shell 12 is provided with an upper flange, the two guide rods 11 are arranged on two sides of the shell 12 respectively, the lower end of each guide rod 11 is connected with the bottom plate of the outer frame 3, the upper end of each guide rod passes through the upper flange of the shell 12 and then is connected with the lower cross rod of the outer frame 3, the suspension wire motor 4 is installed on the upper cross rod of the outer frame 3, the lower end of the suspension wire 19 is connected with the upper flange of the shell 12, the upper end of each suspension wire is connected to the rotating shaft of the suspension wire motor 4, in the embodiment, the two suspension wires 19 are arranged and are connected to two ends of the upper flange of the shell 12 respectively, and the. The winding and unwinding of the suspension wire 19 are realized through a roller shaft matched with the suspension wire motor 4, so that the shell 12 is drawn to move up and down along the guide rod 11 to open or close the reaction kettle. Meanwhile, a pulley 16 is installed on the bottom surface of the base 13, and the base 13 is placed on the bottom plate of the outer frame 3 through the pulley 16 so as to be dragged along the bottom plate, thereby facilitating the filling of the sample 15.
The ground stress loading system comprises a screw motor 5, a screw 6, a first coupling 21 and a force transmission shaft 31. Screw motor 5 passes through motor support 18 to be installed on the sheer pole of outer frame 3, and the upper end and the screw motor 5 of screw 6 are connected, and the lower extreme is connected with the upper end of power transmission shaft 31 through first shaft coupling 21, and the lower extreme of power transmission shaft 31 passes and stretches into the reation kettle inner chamber behind the shell 12 top surface, need set up the sealing washer between power transmission shaft 31 and the shell 12 top surface to guarantee the leakproofness of reation kettle inner chamber. The screw motor 5 is used for driving the screw 6 to move up and down, and the power transmission shaft 31 is driven to move up and down through the first coupling 21 so as to apply ground stress, and the specific movement mechanism is the same as that of the booster pump 24 below.
The top surface of base 13 is equipped with ascending boss, the lower terminal surface of power transmission axle 31 is equipped with decurrent boss, be provided with transparent rubber sleeve 37 in the reation kettle inner chamber, transparent rubber sleeve 37's both ends are established respectively on base 13's boss and power transmission axle 31's boss, and can tighten by the rubber band, constitute the sample chamber of placing sample 15, base 13 and power transmission axle 31 are gone up and all are equipped with the exit with the sample chamber intercommunication, transparent window 39 has been seted up to the shell 12 side, through transparent window 39 and transparent rubber sleeve 37, can observe the change that sample 15 takes place in the experimentation. The sample cavity is also provided with a metal gasket 33, a metal filter screen 34 and a piece of filter paper 35, and two ends of the sample 15 are respectively connected with the boss of the base 13 and the boss of the force transmission shaft 31 after passing through the filter paper 35, the metal filter screen 34 and the metal gasket 33 in sequence.
The outlet pressure control system comprises a booster pump 24, an outlet buffer tank 29, a third pressure gauge P3 and a fifth pressure reducing valve F5, wherein the outlet buffer tank 29 is connected with the booster pump 24, and the booster pump 24 is communicated with an inlet and an outlet of the base 13 after sequentially passing through the third pressure gauge P3 and the fifth pressure reducing valve F5 so as to control the outlet pressure of the sample cavity.
Referring to fig. 4, the booster pump 24 includes a motor 40, a gear 41, a toothed screw 49, a forcing screw 42, a second coupling 43, a piston 50, and a cylinder 51, the gear 41 is mounted on an output shaft of the motor 40, the toothed screw 49 is engaged with the gear 41, the forcing screw 42 is screwed with the toothed screw 49, and an upper end of the forcing screw 42 is connected with the piston 50 sleeved on the cylinder 51 through the second coupling 43. The toothed screw sleeve 49 is only arranged to rotate and cannot move axially along the boosting screw rod 42, the lower end of the boosting screw rod 42 is sleeved on the positioning seat in a sliding mode to serve as a support, the motor 40 drives the gear 41 to rotate, then the gear 41 drives the toothed screw sleeve 49 to rotate, the toothed screw sleeve 49 drives the boosting screw rod 42 to rotate, accordingly, the boosting screw rod 42 moves up and down, the piston 50 is driven by the boosting screw rod 42 to move up and down through the coupler 43, and pressurization is achieved. The cylinder 51 is further provided with a second displacement sensor 44 for detecting the displacement of the piston 50, a pressure sensor 45 for detecting the pressure in the cylinder 51, a gas-liquid inlet/outlet 47 connected to a third pressure gauge P3, and a surge tank port 48 connected to the outlet surge tank 29.
The vacuum pumping system comprises a vacuum pump 23 and a second pressure reducing valve F2, wherein the vacuum pump 23 is communicated with the inlet and the outlet of the force transmission shaft 31 through a second pressure reducing valve F2 through a pipeline and is used for pumping air in the sample cavity away before hydrate synthesis.
The constant pressure intake system includes a gas cylinder 27, a sixth pressure reducing valve F6, a first pressure gauge P1, a third pressure reducing valve F3, a constant pressure pump 26, and an inlet buffer tank 28. The inlet buffer tank 28 is connected to the constant pressure pump 26, the constant pressure pump 26 is connected between the sixth pressure reducing valve F6 and the first pressure gauge P1, and the gas cylinder 27 is communicated with the inlet and the outlet of the force transmission shaft 31 after sequentially passing through the sixth pressure reducing valve F6, the first pressure gauge P1 and the third pressure reducing valve F3. An inlet-outlet differential pressure sensor 30 is arranged between the outlet pressure control system and the constant pressure air inlet system, one end of the inlet-outlet differential pressure sensor is connected to a pipeline between the third pressure reducing valve F3 and the inlet and the outlet of the force transmission shaft 31, and the other end of the inlet-outlet differential pressure sensor is connected to a phase pipeline between the fifth pressure reducing valve F5 and the inlet and the outlet of the base 13.
The confining pressure loading system comprises a confining pressure liquid loading device 10, a first pressure reducing valve F1, an electric booster pump 25, a second pressure gauge P2 and a fourth pressure reducing valve F4. An inlet and an outlet are formed in the side surface of the shell 12, and the confining pressure liquid loading device 10 is communicated with the inlet and the outlet of the shell 12 through a first pressure reducing valve F1 and can inject confining pressure liquid into a pressure cavity. The electric booster pump 25 is communicated with the inlet and the outlet of the shell 12 through a second pressure gauge P2 and a fourth pressure reducing valve F4 in sequence and is used for adjusting the confining pressure of the reaction kettle.
The data acquisition system comprises a data acquisition board 2 connected with the computer 1, a temperature sensor 7 and a confining pressure sensor 8 which are arranged on the top of the shell 12 and extend into the inner cavity of the reaction kettle, an earth stress sensor 22 arranged on the first coupler 21, and a first displacement sensor 9 arranged between the lower cross bar and the shell, wherein the temperature sensor 7, the confining pressure sensor 8, the first displacement sensor 9 and the earth stress sensor 22 are all connected with the data acquisition board 2.
The temperature control system is an air bath 32, and the whole reaction kettle is arranged in the air bath, so that the low-temperature environment for generating the hydrate is realized.
In this embodiment, the main processes of the permeability test include:
(1) assembling and checking the airtightness of the apparatus: after the vacuumizing system, the constant-pressure air inlet system, the confining pressure loading system, the ground stress loading system, the outlet pressure control system and the data acquisition system are assembled with the reaction kettle, flanges are left unconnected, corresponding drainage and exhaust pipes are connected, the lower end of the transparent rubber sleeve 37 is tightly tied by a rubber ring to be tightly attached to a boss of the base 13 (wherein the transparent rubber sleeve 37 can be a hollow cylindrical or square structure), a metal sleeve 36 is sleeved on the boss, the boss is fixed by a fixing clamp 38, the sample 15 begins to be installed, after the sample 15 is installed, the fixing clamp 38 and the metal sleeve 36 are removed, the inner cavity of the reaction kettle is closed and sealed, the confining pressure is increased to 5MPa by the confining pressure loading system, the temperature is normal temperature, helium is injected into the sample cavity through the constant-pressure air inlet system, and the air tightness is detected by using liquid detergent along a seam. The airtightness is good and the next step is carried out. The calibration sample 15 can be made of polytetrafluoroethylene, aluminum, lead or other elastic materials with small elastic modulus, the middle part is perforated and ensures that the inlet and the outlet of the force transmission shaft are communicated with the inlet and the outlet of the base through the calibration sample, and the elastic modulus of the calibration sample is far smaller than that of stainless steel.
(2) Filling a sample: the helium gas and the confining pressure liquid are removed, the flange connecting screw 14 connected between the shell 12 and the base 13 is opened, the shell 12 is lifted upwards, and the base 13 is pulled out. As in the step (1), the sediment sample 15 is fixed between the force transmission shaft 31 and the base 13, and the bottom and top of the sample 15 are respectively laid with a metal spacer 33, a metal screen 34, and a filter paper 35. The transparent rubber cover 37 is tightly attached to the boss of the base 13 and the boss of the force transmission shaft 31 by a rubber band.
(3) Hydrate generation: the casing 12 is held vertically closed and the casing 12 and base 13 are again secured by flange attachment screws 14 and confining pressure fluid is injected. The confining pressure loading system is utilized to gradually pressurize the confining pressure in the reaction kettle to a required value, methane gas is injected into the sample cavity through the constant-pressure gas inlet system, deionized water is injected into the sample cavity through the water inlet system, and the temperature is gradually reduced to the synthesis temperature of the natural gas hydrate through the air bath 32 to synthesize the natural gas hydrate.
(4) The constant pressure pump 26 is started to inject helium gas, the inlet and outlet of the base 13 are connected to an outlet pressure control system, constant inlet and outlet pressure is set, and gas flow is detected.
(5) And adjusting the ground stress and the confining pressure to an experimental reference value through a ground stress loading system and a confining pressure loading system, and detecting and recording the flow rate after the gas outlet pressure is stable.
(6) And after the measurement is finished, reducing the outlet pressure to be below the hydrate phase equilibrium pressure to partially decompose the hydrate, then increasing the outlet pressure to a certain value, and finishing the first hydrate decomposition.
(7) The constant pressure pump 26 is started again to inject helium, and constant inlet and outlet pressure is set to detect the gas flow.
(8) And when the air outlet pressure and the air outlet speed are stable, detecting and recording the flow speed.
(9) And after the measurement is finished, reducing the outlet pressure to be below the hydrate phase equilibrium pressure to partially decompose the hydrate, then increasing the outlet pressure to a certain value, and finishing the second hydrate decomposition.
(10) And 7, repeating the steps 7-9 to finish the triaxial loading permeability test of the hydrate sediment in the pressure reduction process of the hydrate.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.

Claims (7)

1. A hydrate deposit permeability testing arrangement which characterized in that: the device comprises a reaction kettle, a constant-pressure air inlet system, a water inlet system, an outlet pressure control system, a confining pressure loading system, a ground stress loading system, a data acquisition system, a vacuum pumping system and a temperature control system, wherein the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuum pumping system; the constant-pressure air inlet system, the water inlet system, the outlet pressure control system, the confining pressure loading system, the ground stress loading system, the data acquisition system, the vacuumizing system and the temperature control system are all connected with the computer (1);
the reaction kettle comprises an outer frame (3), a suspension wire motor (4), a guide rod (11), a shell (12), a base (13), pulleys (16) and a suspension wire (19), wherein the shell (12) is a cylinder with a closed top surface, a lower flange is arranged on the bottom surface of the shell, the shell is fixedly connected with the top surface of the base (13) through the lower flange to form a closed reaction kettle inner cavity, the outer frame (3) comprises a bottom plate, two vertical rods arranged on the bottom plate at intervals, a lower cross rod connected to the middle parts of the two vertical rods and an upper cross rod connected to the tops of the two vertical rods, an upper flange is arranged on the top surface of the shell (12), the guide rods (11) are arranged on two sides of the shell (12) respectively, the lower end of each guide rod (11) is connected with the bottom plate of the outer frame (3), the upper end of each guide rod penetrates through the upper flange of the shell (12) and then is connected with the lower cross rod of the, the lower end of a suspension wire (19) is connected with an upper flange of the shell (12), the upper end of the suspension wire is connected to a rotating shaft of a suspension wire motor (4), the suspension wire motor (4) drives the suspension wire (19) to be retracted so as to drive the shell (12) to move up and down along the guide rod (11), the pulley (16) is installed on the bottom surface of the base (13), and the base (13) is placed on the bottom plate of the outer frame (3) through the pulley (16);
the ground stress loading system comprises a screw motor (5), a screw (6), a first coupler (21) and a force transmission shaft (31), the screw motor (5) is installed on a lower cross bar of the outer frame (3), the upper end of the screw (6) is connected with the screw motor (5), the lower end of the screw is connected with the upper end of the force transmission shaft (31) through the first coupler (21), and the lower end of the force transmission shaft (31) penetrates through the top surface of the shell (12) and then extends into the inner cavity of the reaction kettle;
an upward boss is arranged on the top surface of the base (13), a downward boss is arranged on the lower end surface of the force transmission shaft (31), a transparent rubber sleeve (37) is arranged in the inner cavity of the reaction kettle, two ends of the transparent rubber sleeve (37) are respectively sleeved on the boss of the base (13) and the boss of the force transmission shaft (31) to form a sample cavity for placing a sample (15), an inlet and an outlet communicated with the sample cavity are respectively arranged on the base (13) and the force transmission shaft (31), and a transparent window (39) is arranged on the side surface of the shell (12);
the outlet pressure control system comprises a booster pump (24), an outlet buffer tank (29), a third pressure gauge (P3) and a fifth pressure reducing valve (F5), the outlet buffer tank (29) is connected with the booster pump (24), and the booster pump (24) is communicated with an inlet and an outlet of the base (13) after sequentially passing through the third pressure gauge (P3) and the fifth pressure reducing valve (F5);
booster pump (24) include motor (40), gear (41), take tooth swivel nut (49), afterburning screw rod (42), second shaft coupling (43), piston (50) and cylinder body (51), gear (41) are installed on the output shaft of motor (40), take tooth swivel nut (49) and gear (41) mesh mutually, afterburning screw rod (42) and take tooth swivel nut (49) spiro union, afterburning screw rod (42) are connected with piston (50) of cover on cylinder body (51) through second shaft coupling (43), still be equipped with second displacement sensor (44) that are used for detecting piston (50) displacement on cylinder body (51), pressure sensor (45) that are used for detecting cylinder body (51) pressure, gas-liquid exit (47) of being connected with third manometer (P3), buffer tank interface (48) of being connected with export buffer tank (29).
2. The hydrate deposit permeability test apparatus of claim 1, wherein: the vacuum pumping system comprises a vacuum pump (23) and a second pressure reducing valve (F2), wherein the vacuum pump (23) is communicated with an inlet and an outlet of the force transmission shaft (31) through the second pressure reducing valve (F2).
3. The hydrate deposit permeability test apparatus of claim 1, wherein: the constant pressure air inlet system comprises an air bottle (27), a sixth pressure reducing valve (F6), a first pressure gauge (P1), a third pressure reducing valve (F3), a constant pressure pump (26) and an inlet buffer tank (28), the inlet buffer tank (28) is connected to the constant pressure pump (26), the constant pressure pump (26) is connected between the sixth pressure reducing valve (F6) and the first pressure gauge (P1), the air bottle (27) sequentially passes through the sixth pressure reducing valve (F6), the first pressure gauge (P1), the third pressure reducing valve (F3) is communicated with an inlet and an outlet of a force transmission shaft (31), the constant pressure air inlet system further comprises an inlet and outlet pressure difference sensor (30), one end of the inlet and outlet pressure difference sensor is connected to a pipeline between the third pressure reducing valve (F3) and the force transmission shaft (31), and the other end of the inlet and the outlet of the fifth pressure reducing valve (F5) and a.
4. The hydrate deposit permeability test apparatus of claim 1, wherein: confining pressure loading system including confining pressure liquid loading device (10), first relief pressure valve (F1), electronic booster pump (25), second manometer (P2) and fourth relief pressure valve (F4), exit has been seted up to the side of shell (12), confining pressure liquid loading device (10) are through the exit intercommunication of first relief pressure valve (F1) with shell (12), electronic booster pump (25) are in proper order through the exit intercommunication of second manometer (P2), fourth relief pressure valve (F4) and shell (12).
5. The hydrate deposit permeability test apparatus of claim 1, wherein: the data acquisition system include data acquisition board (2) be connected with computer (1), install at shell (12) top and extend to temperature sensor (7) and confined pressure sensor (8) in the reation kettle inner chamber, install ground stress sensor (22) on first shaft coupling (21) and install first displacement sensor (9) between sheer pole and shell, temperature sensor (7), confined pressure sensor (8), first displacement sensor (9) and ground stress sensor (22) all are connected with data acquisition board (2).
6. The hydrate deposit permeability test apparatus of claim 1, wherein: the temperature control system is an air bath (32).
7. The hydrate deposit permeability test apparatus of claim 1, wherein: the sample cavity is also internally provided with a metal gasket (33), a metal filter screen (34) and filter paper (35), and two ends of the sample (15) are respectively connected with the boss of the base (13) and the boss of the force transmission shaft (31) after sequentially passing through the filter paper (35), the metal filter screen (34) and the metal gasket (33).
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