CN109655373B - Natural gas hydrate reservoir in-situ property parameter simulation test method - Google Patents
Natural gas hydrate reservoir in-situ property parameter simulation test method Download PDFInfo
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- CN109655373B CN109655373B CN201811596563.6A CN201811596563A CN109655373B CN 109655373 B CN109655373 B CN 109655373B CN 201811596563 A CN201811596563 A CN 201811596563A CN 109655373 B CN109655373 B CN 109655373B
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- 238000004088 simulation Methods 0.000 title claims abstract description 133
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 300
- 239000000945 filler Substances 0.000 claims abstract description 53
- 230000035699 permeability Effects 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 73
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 238000012360 testing method Methods 0.000 claims description 24
- 239000011800 void material Substances 0.000 claims description 22
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 11
- 239000013049 sediment Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
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- 238000003786 synthesis reaction Methods 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 7
- 238000011068 loading method Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
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- 230000008014 freezing Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- -1 natural gas hydrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
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- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Acoustics & Sound (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a natural gas hydrate reservoir in-situ property parameter simulation test method, which is based on a system comprising a simulation chamber filled with filler, wherein the simulation chamber is connected with a temperature measurement unit, a temperature control unit, a resistivity measurement unit, a permeability measurement unit, an acoustic wave measurement unit and a gas volume calibration chamber, the pressure control unit is connected with the simulation chamber and the gas volume calibration chamber, a temperature sensor and a pressure sensor are arranged in the gas volume calibration chamber, and the temperature sensor and the pressure sensor of the temperature measurement unit, the temperature control unit, the pressure control unit, the resistivity measurement unit, the permeability measurement unit, the acoustic wave measurement unit and the gas volume calibration chamber are connected with a data processing and signal management and control unit. The invention can obtain the association relation between the nature parameters of the natural gas hydrate reservoir such as the porosity, permeability, hydrate saturation and the like of the simulated natural gas hydrate reservoir and the geophysical parameters such as sound wave, resistivity and the like.
Description
Technical Field
The invention relates to a natural gas hydrate reservoir in-situ property parameter simulation test method based on a natural gas hydrate reservoir in-situ property parameter simulation test system, and belongs to the field of natural gas hydrate exploration and exploitation.
Background
The expert estimates that the total world oil reserves are between 2700 and 6500 tons. According to the consumption speed of 21 st century, the world oil resources are consumed for 50-60 years. The discovery of natural gas hydrates has made new hopes visible to humans involved in energy crisis. Natural gas hydrate (commonly known as methane hydrate) is a potential geological energy source, and has large reserves and wide distribution. It is estimated by international geological exploration that the amount of methane hydrate in the earth's deep sea is enough to exceed 2.84 x10 21m3, 800 times the amount of conventional gas energy storage, wherein 1.135 x10 20m3 of gas may be contained in the combustible ice layer. Once mined, hydrated methane will extend the human fuel usage history for centuries. However, in order to extract the combustible ice, the basic properties of the combustible ice reservoir must be grasped to obtain relevant parameters. From the practical exploitation point of view, the technical challenges faced by obtaining in-situ parameters of the reservoir are great due to the characteristic that natural gas hydrate is easy to decompose and the decomposition of the natural gas hydrate leads to strong reservoir structure change, and no mature direct test technical conditions and capability exist at present. Therefore, the natural gas hydrate reservoir in-situ property parameter simulation test technology is designed, is certainly a promising technical development direction, and has high practical value for natural gas hydrate resource evaluation and exploitation engineering technical research.
Disclosure of Invention
The invention aims to provide a natural gas hydrate reservoir in-situ property parameter simulation test method based on the system, which can obtain the association relation between the natural gas hydrate reservoir property parameters such as porosity, permeability, hydrate saturation and the like of a simulated natural gas hydrate reservoir and geophysical parameters such as sound waves, resistivity and the like, and provides reliable experimental data for knowing the geological property characteristics and exploitation engineering conditions of the simulated natural gas hydrate reservoir.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The natural gas hydrate reservoir in-situ property parameter simulation test system is characterized in that: the natural gas hydrate storage system comprises a simulation chamber filled with filler, wherein the filler is used for simulating a natural gas hydrate storage layer; the simulation chamber is connected with the temperature measurement unit, the temperature control unit, the resistivity measurement unit, the permeability measurement unit, the sound wave measurement unit and the gas volume calibration chamber, the pressure control unit is connected with the simulation chamber and the gas volume calibration chamber, the gas volume calibration chamber is provided with a temperature sensor and a pressure sensor, and the temperature measurement unit, the temperature control unit, the pressure control unit, the resistivity measurement unit, the permeability measurement unit and the sound wave measurement unit are connected with the temperature sensor and the pressure sensor of the gas volume calibration chamber and the data processing and signal management and control unit.
The natural gas hydrate reservoir in-situ property parameter simulation test method based on the natural gas hydrate reservoir in-situ property parameter simulation test system is characterized by comprising the following steps of:
1) The gas tightness of the system in an idle state is detected by using the working gas cleaning system;
2) Measuring the total space volume of the system in an idle state, and calibrating the dead volume of the system based on the volume of the clean cavity;
3) Preparing a filler for simulating a natural gas hydrate reservoir;
4) Filling the cavity of the simulation chamber with the prepared filler, and plugging two ports of the cavity through an injection plug and an output plug respectively;
5) Detecting the air tightness of the cavity in the loading state;
6) Cleaning the cavity of the simulation chamber filled with the filler by using working gas and a space communicated with the cavity;
7) Measuring and controlling the gas flow output by the cavity and measuring the pressure of the gas input and output ports of the cavity by the permeability measuring unit, and calculating the initial permeability of the filler in the cavity of the simulation chamber;
8) Measuring the total empty space volume of the system in the cavity loading state, and calculating the initial void volume of the filler in the cavity based on the calibrated dead volume of the system and the net cavity volume, so as to obtain the initial porosity of the filler;
9) Synthesizing natural gas hydrate, and monitoring acoustic parameters and resistivity parameters during and after synthesis;
10 Measuring the total empty space volume of the system after the synthesis of the natural gas hydrate is completed, and calculating the void volume of the filler containing the natural gas hydrate based on the calibrated dead volume and the clean cavity volume of the system, thereby obtaining the porosity of the filler containing the natural gas hydrate, and further calculating the saturation of the natural gas hydrate;
11 Measuring and controlling the gas flow output by the cavity and measuring the pressure of the gas input and output ports of the cavity by the permeability measuring unit, and calculating the permeability of the filler containing the natural gas hydrate;
12 Regulating the temperature and the pressure to the temperature and the pressure of the simulated natural gas hydrate reservoir, and measuring the acoustic parameters and the resistivity parameters of the filler containing the natural gas hydrate under the environmental conditions of the reservoir;
13 The natural gas hydrate reservoir in-situ property parameter simulation test is finished.
The invention has the advantages that:
The invention aims at the simulated natural gas hydrate reservoir, obtains the association relation between the reservoir property parameters such as porosity, permeability, hydrate saturation and the like of the reservoir and the geophysical parameters such as acoustic wave and resistivity and the like thereof by a simulation experiment mode based on acoustic wave and electricity geophysical test principles, can effectively serve the resource evaluation and exploitation engineering scheme design of the natural gas hydrate, and provides a reliable basis for data association for obtaining the in-situ state key reservoir property parameters of the natural gas hydrate reservoir by a geophysical test technical means.
Drawings
FIG. 1 is a schematic diagram of the composition of the natural gas hydrate reservoir in situ property parameter simulation test system of the present invention.
FIG. 2 is a schematic diagram of a natural gas hydrate reservoir in situ property parameter simulation test system according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of the construction of the supercharging assembly.
Fig. 4 is a schematic diagram of the composition of an acoustic wave measuring unit.
Detailed Description
As shown in fig. 1, the natural gas hydrate reservoir in-situ property parameter simulation test system of the present invention comprises a simulation chamber 10 filled with a filler for simulating a natural gas hydrate reservoir; the simulation chamber 10 is connected with the temperature measuring unit 50, the temperature control unit 40, the resistivity measuring unit 20, the permeability measuring unit 70, the sound wave measuring unit 30 and the gas volume calibrating chamber 80, the pressure control unit 60 is connected with the simulation chamber 10 and the gas volume calibrating chamber 80, the gas volume calibrating chamber 80 is provided with a temperature sensor 81 and a pressure sensor 82, the temperature sensor 81 and the pressure sensor 82 are respectively used for measuring the temperature and the pressure in the gas volume calibrating chamber 80, and the temperature measuring unit 50, the temperature control unit 40, the pressure control unit 60, the resistivity measuring unit 20, the permeability measuring unit 70, the sensors in the sound wave measuring unit 30, the actuators such as a switch valve and the like, and the temperature sensor 81 and the pressure sensor 82 of the gas volume calibrating chamber 80 are connected with a data processing and signal controlling unit (not shown in the figure).
As shown in fig. 2, the simulation chamber 10 includes a cavity, two ports of the cavity are respectively provided with an injection plug 13 and an output plug 14, the inner wall of the cavity is made of insulating materials, anti-blocking filter screens are installed in the injection ports of the injection plugs 13 and the output ports of the output plugs 14, and a reinforcing screw rod for reinforcing the axial strength of the simulation chamber 10 to prevent axial bending due to compression is installed outside the cavity.
In the invention, the injection plug 13 and the output plug 14 are in sealing design, and can be connected with related devices such as valves and the like according to the needs of each unit, and the injection plug 13, the output plug 14 and the cavity are in sealing connection and can be detached, so that filling and replacement of filling materials in the cavity are convenient.
In practical implementation, the synthesis of natural gas hydrate needs to be performed in a high-pressure and low-temperature environment, so that the cavity of the simulation chamber 10 needs to be made of a high-pressure resistant material, the pressure resistance of the simulation chamber is ensured to be 35MPa, the temperature bearing capacity range covers-20 ℃ to 50 ℃, and the cavity can be designed to be a cylinder.
In practical design, referring to fig. 2, the temperature control unit 40 includes a cooling fluid jacket 41 attached to an outer wall of the cavity, the cooling fluid jacket 41 is connected to a cooling fluid supply and transmission path (not shown in the figure), and an insulation layer 42 is provided outside the cooling fluid jacket 41, wherein the cooling fluid supply and transmission path controls fluid entering and exiting the cooling fluid jacket 41 so as to achieve the purpose that the cooling fluid jacket 41 adjusts the temperature in the cavity to make the cavity at a set temperature, and the cooling fluid supply and transmission path is controlled by the data processing and signal management and control unit. The refrigeration fluid supply and delivery circuit, refrigeration fluid jacket 41, is of conventional design and equipment known in the art.
In the present invention, the temperature measuring unit 50 includes a plurality of temperature sensors 52 mounted on the inner wall of the cavity and a plurality of temperature sensors 51 mounted on the outer wall of the cavity between the cavity and the refrigerating fluid jacket 41, and signal ports of the temperature sensors 51, 52 are connected with corresponding signal ports of the data processing and signal managing unit. The temperature sensor 51 is used for detecting the temperature in the cavity, the temperature sensor 52 is used for detecting the temperature of the refrigerating fluid in the cavity, and the temperature sensor are used for feeding back temperature data to the data processing and signal management and control unit for processing and other operations.
Referring to fig. 3, the pressure control unit includes a gas pressure regulating valve and a pressurizing assembly 61, a gas delivery inlet of the pressurizing assembly 61 is connected with a methane gas source 200 and a working gas source 300 through a first multi-way control valve 101, a gas delivery outlet of the pressurizing assembly 61 is connected with a gas inlet of the gas pressure regulating valve 62, a gas outlet of the gas pressure regulating valve 62 is connected with a gas inlet of a second multi-way control valve 102, a gas outlet of the second multi-way control valve 102 is connected with an injection port of the injection plug 13, another gas outlet of the second multi-way control valve 102 is connected with a gas inlet of the gas volume calibration chamber 80, and a gas outlet of the gas volume calibration chamber 80, a discharge port 90 penetrating the outside and the injection port of the injection plug 13 are connected through a third multi-way control valve 103. The signal ports of the gas pressure regulating valve 62, the pressure increasing assembly 61, the first multi-way control valve 101, the second multi-way control valve 102 and the third multi-way control valve 103 are connected with the corresponding signal ports of the data processing and signal management and control unit.
In the present invention, the pressure control unit 60 is used to regulate and control the pressure in the chamber, and the pressure in the gas volume calibration chamber 80.
As shown in fig. 3, the booster assembly 61 includes a booster pump 612, an air inlet of the booster pump 612 is connected to the methane air source 200 and the working air source 300 through the first multi-way control valve 101, an air outlet of the booster pump 612 is connected to an air inlet of the gas pressure regulating valve 62 via a high-pressure gas storage tank 613, and a back pressure valve 614 for preventing fluid from returning is installed at the air inlet of the booster pump 612, the air inlet of the high-pressure gas storage tank 613, and the air outlet of the high-pressure gas storage tank 613. The booster pump 612 is connected to the air compressor 611, and the booster pump 612 operates under the auxiliary drive of the air compressor 611. The output pressure of the booster pump 612 should be up to 60MPa.
In actual operation, the gas in the methane gas source 200 and the working gas source 300 can be directly fed into the cavity of the simulation chamber 10 through the booster pump 612, the gas pressure regulating valve 62, the second multi-way control valve 102 and the injection port of the injection plug 13, or can be fed into the gas volume calibration chamber 80 through the booster pump 612, the gas pressure regulating valve 62 and the second multi-way control valve 102. The gas in the gas volume calibration chamber 80 can be fed into the cavity of the simulation chamber 10 through the third multi-way control valve 103 and the injection port of the injection plug 13.
In the present invention, referring to fig. 2, the resistivity measuring unit 20 includes a plurality of turns of resistivity measuring electrodes disposed around the cavity and insulated from the cavity, signal ports of the resistivity measuring electrodes are connected to corresponding signal ports of a resistivity measuring device (not shown in the drawing), the resistivity measuring device is an electronic device (existing in the art) for receiving an electric signal fed back by the resistivity measuring electrodes and calculating resistivity based on the electric signal, and the signal ports of the resistivity measuring device are connected to corresponding communication ports of the data processing and signal management unit, wherein: the resistivity measuring electrodes of each circle are uniformly distributed at equal intervals along the length direction of the simulation chamber; and a plurality of resistivity measuring points 21 are uniformly arranged on each circle of resistivity measuring electrode, probes on the resistivity measuring points 21 penetrate through the cavity and penetrate into the inner cavity, and good insulativity and sealing performance are realized between the probes and the cavity.
As shown in fig. 2 and 4, the acoustic wave measuring unit 30 includes several pairs of acoustic dipoles mounted on the inner wall of the cavity, each pair of acoustic dipoles being mounted in opposite directions and being uniformly distributed at equal intervals in the middle section of the cavity along the length direction of the simulation chamber, wherein: for each pair of acoustic dipoles, one acoustic dipole 31 penetrates through the cavity to be connected with an external acoustic wave transmitting device 33, the other acoustic dipole 32 penetrates through the cavity to be connected with an external acoustic wave receiving device 34, signal ports of the acoustic wave transmitting device 33 and the acoustic wave receiving device 34 are connected with corresponding communication ports of the data processing and signal management and control units, and good insulativity and sealing performance are achieved between the acoustic dipoles 31 and 32 and the cavity. The acoustic wave transmitting means 33 transmits the acoustic wave signal to the opposite acoustic dipole 32 via the acoustic dipole 31, and when the acoustic wave signal passes through the filler and is received by the acoustic dipole 32, the acoustic dipole 32 transmits the received acoustic wave signal to the acoustic wave receiving means 34, thereby completing an acoustic wave detection. An oscilloscope may be connected to the acoustic wave receiving device 34.
In the present invention, the permeability measurement unit 70 includes a gas pressure gauge 71 connected to the injection port of the injection plug 13, and an output gas flow measurement and control valve 73 and a gas pressure gauge 72 connected to the output port of the output plug 14, where signal ports of the gas pressure gauges 71 and 72 and the output gas flow measurement and control valve 73 are respectively connected to corresponding communication ports of the data processing and signal management and control unit.
In actual operation, the output gas flow measurement and control valve 73 is used to measure and control the gas flow output from the simulation chamber 10 in a constant state, so that in this state, the gas pressures at the gas input and output ports of the simulation chamber 10 are measured based on the gas pressure gauges 71, 72 for use in calculating the permeability.
In the present invention, the data processing and signal controlling unit is used for receiving the measurement data fed back by the temperature measuring unit 50, the resistivity measuring unit 20, the permeability measuring unit 70, the acoustic wave measuring unit 30, etc., and controlling the temperature controlling unit 40, the pressure controlling unit 60, etc., and the data processing and signal controlling unit may include a single chip microcomputer or a microprocessor, or may be a computer system, which is a well known technology in the art, so it is not described in detail herein.
In the present invention, since the tube diameter of the chamber body of the simulation chamber 10 is not large and is surrounded by the refrigerating fluid jacket 41, the temperature and pressure difference in the radial direction of the chamber body is small. However, in the longitudinal direction of the chamber, since the liquid inlet and outlet ports of the refrigeration fluid jacket 41 are generally provided at both ends in the longitudinal direction thereof, the difference in temperature and pressure in the longitudinal direction of the chamber is not negligible. Therefore, the invention adopts the temperature sensors uniformly distributed at equal intervals along the length direction of the simulation chamber 10, and the resistivity measuring electrodes are uniformly distributed at equal intervals along the length direction of the simulation chamber. For acoustic dipoles, the relative positions of the acoustic dipoles cannot be changed, and the acoustic dipoles must be arranged in pairs, and typically, a plurality of pairs of acoustic dipoles are uniformly distributed in a middle area of the cavity (i.e., a middle portion viewed along the length of the simulation chamber) at equal intervals along the length of the simulation chamber.
Because the mixed gas in the simulation chamber 10 has the dangerous hidden danger of inflammability and explosiveness, the inner wall of the cavity should be coated with an antistatic coating or the cavity should be lined with an insulating sleeve. In addition, the cavity can also be subjected to cracking prevention and enhancement degree treatment to ensure the safety performance of the container.
It should be mentioned that detecting the change in resistivity in a sediment system is a difficulty. The existing detection method is to arrange an inserted electrode column in a measurement cavity. Because the electrode column and the lead are both positioned in the measuring cavity, a certain influence can be generated on the measured resistivity field, and a larger error exists in the resistivity acquisition result. Aiming at the defects of the existing detection method, the invention changes the electrode column of the measuring tool into the resistivity measuring points, as shown in figure 2, the arrangement mode is changed into a cylindrical annular distribution mode from an insertion mode, namely, the measuring points of the resistivity measuring electrodes are annularly wound on the cavity, thus the lead is positioned outside the cavity, and the probe with the length of only 3mm is inserted into the cavity for measurement, so the influence is small. In addition, as the resistivity of the natural gas hydrate at the innermost part of the filler is not easy to be directly measured, in practical implementation, the invention adopts an indirect measurement method, namely, after power is supplied to the filler, the voltage drop between two resistivity measurement points 21 on the same resistivity measurement electrode is measured to achieve the purpose of measuring the resistivity.
In the present invention, the pressure sensor is preferably a flat membrane type pressure sensor.
Based on the above-mentioned natural gas hydrate reservoir in-situ property parameter simulation test system, the invention also provides a natural gas hydrate reservoir in-situ property parameter simulation test method, which comprises the following steps:
1) The gas tightness of the system in an idle state is detected by using the working gas cleaning system;
2) Measuring the total space volume of the system in an idle state, and calibrating the dead volume of the system based on the volume of the clean cavity;
3) Preparing a filler for simulating a natural gas hydrate reservoir;
4) Filling the cavity of the simulation chamber 10 with the prepared filler, and blocking two ends of the cavity through an injection plug 13 and an output plug 14 respectively;
5) Detecting the air tightness of the cavity in the loading state;
6) Cleaning the cavity of the filled simulation chamber 10 and the space communicated with the cavity by using working gas (such as nitrogen and the like);
7) The initial permeability of the filler in the chamber 10 is calculated by measuring and controlling the gas flow rate output by the chamber and measuring the pressures of the gas input and output ports of the chamber by the permeability measuring unit 70;
8) Measuring the total empty space volume of the system in the cavity loading state, and calculating the initial void volume of the filler in the cavity based on the calibrated dead volume of the system and the net cavity volume, so as to obtain the initial porosity of the filler;
9) Synthesizing natural gas hydrate, and monitoring acoustic parameters and resistivity parameters during and after synthesis;
10 Measuring the total empty space volume of the system after the synthesis of the natural gas hydrate is completed, and calculating the void volume of the filler containing the natural gas hydrate based on the calibrated dead volume and the clean cavity volume of the system, thereby obtaining the porosity of the filler containing the natural gas hydrate, and further calculating the saturation of the natural gas hydrate;
11 By means of the permeability measuring unit 70, measuring and controlling the gas flow rate output by the cavity, and measuring the pressure of the gas input and output ports of the cavity, the permeability of the filler containing natural gas hydrate is calculated;
12 Regulating the temperature and the pressure to the temperature and the pressure of the simulated natural gas hydrate reservoir, and measuring the acoustic parameters and the resistivity parameters of the filler containing the natural gas hydrate under the environmental conditions of the reservoir;
13 The natural gas hydrate reservoir in-situ property parameter simulation test is finished, and the data are analyzed and processed later.
In actual operation, the air tightness detection process in step 1) and step 5) generally includes detecting tightness of the cavity of the simulation chamber 10, the injection plug 13, the output plug 14, tightness of each unit, tightness of each pipe communicating between the cavity and the relevant unit, tightness of each pipe communicating between the injection plug 13 and the relevant unit, and tightness of each pipe communicating between the output plug 14 and the relevant unit. In the present invention, the airtightness detection is performed by a method well known in the art, and thus, will not be described in detail herein.
In the invention, the total space volume of the system refers to the total volume of the net cavity volume of the simulation chamber 10, the related pipelines communicated with the simulation chamber and the inner cavity volume of each part under the no-load state of the system; the net cavity volume refers to the volume inherent to the cavity itself of the simulation chamber 10; the dead volume of the system refers to the sum of the volumes of the inner cavities of the related pipelines and parts communicated with the analog chamber 10 outside the cavity; the total empty space volume of the system refers to the total volume occupied by all gaps in the cavity filling material and the volume of the inner cavities of the related pipelines and parts communicated with the simulation chamber 10 in the cavity loading state.
In practice, step 2) comprises the steps of:
2-1) when it is confirmed that the simulation chamber 10 and the gas volume calibration chamber 80 in the empty state of the system are communicated with each other, but are closed to the outside, the gas path between the gas volume calibration chamber 80 and the simulation chamber 10 is cut off, the working gas is injected into the gas volume calibration chamber 80 until the pressure is within the set range, the temperature T 0 and the pressure P 0 of the working gas in the gas volume calibration chamber 80 are measured, the temperature T and the pressure P of the simulation chamber 10 are measured, and the original mole number n 0 of the working gas in the gas volume calibration chamber 80 is calculated by the following formula 1) according to the actual gas state equation:
In formula 1), V 0 is the volume of the gas volume calibration chamber 80, R is the universal gas constant (8.31 kPa L mol -1·K-1), a and b are the Van der Waals correction of the working gas (available from the relevant professional tools approach),
2-2) A gas path between the gas volume calibration chamber 80 and the simulation chamber 10 is communicated, and after the gas pressure balance and stabilization between the gas volume calibration chamber 80 and the simulation chamber 10 are achieved, the gas path is disconnected, the temperature T 1 and the pressure P 1 of the working gas in the gas volume calibration chamber 80 are measured, and the number n 1 of moles of the remaining working gas in the gas volume calibration chamber 80 is calculated according to an actual gas state equation by the following formula 2):
2-3) after the temperature of the gas in the simulation chamber 10 is balanced at the temperature T, measuring the pressure P' of the gas in the simulation chamber 10, calibrating the change of the number of moles of the working gas in the chamber 80 based on the volume of the gas, and the pressure change of the working gas in the simulation chamber 10, calculating the total space volume V of the system according to the actual gas state equation by the following formula 3):
2-4) deducting the net cavity volume V 'from the total system space volume V to obtain the system dead volume V s, i.e. V-V' =v s.
In practice, step 3) comprises the steps of:
3-1) taking the sediment from the natural gas hydrate reservoir to be simulated or the sediment prepared for simulating the natural gas hydrate reservoir to be simulated, fully wetting and uniformly mixing the reservoir water from the natural gas hydrate reservoir to be simulated or the reservoir water prepared for simulating the natural gas hydrate reservoir to be simulated,
3-2) Placing the sediment of the natural gas hydrate reservoir to be simulated with water or the sediment prepared by simulating the natural gas hydrate reservoir to be simulated with water below-7 ℃ for freezing until the water is completely frozen into 'ice and sand',
3-3) Mashing the ice sand, uniformly mixing, and continuously freezing at a low temperature (lower than-5 ℃) for standby.
The term "ice sand" as used herein is intended to mean, unlike the actual ice sand, ice-coated and crosslinked sediment or simulated sediment particles.
In steps 1) and 6), the working gas is outputted from the working gas source 300, and is fed into the cavity of the simulation chamber 10 via the pressurizing assembly 61 for increasing the gas pressure and the gas pressure regulating valve 62, so as to clean the cavity of the simulation chamber 10 empty or filled with the filler and the space communicated with the cavity.
In practice, step 8) comprises the steps of:
8-1) in the case where it is confirmed that the packing-filled simulation chamber 10 and the gas volume calibration chamber 80 are communicated with each other but are closed to the outside, the gas path between the gas volume calibration chamber 80 and the simulation chamber 10 is cut off, the working gas is injected into the gas volume calibration chamber 80 until the pressure is within a predetermined range, the temperature T 0 and the pressure P 0 of the working gas in the gas volume calibration chamber 80 are measured, the temperature T and the pressure P of the simulation chamber 10 are measured, the original number n 0 of moles of the working gas in the gas volume calibration chamber 80 is calculated by the above formula 1) according to the actual gas state equation,
8-2) The gas path between the gas volume calibration chamber 80 and the simulation chamber 10 is communicated, after the gas pressure balance and stabilization between the gas volume calibration chamber 80 and the simulation chamber 10 are achieved, the gas path is disconnected, the temperature T 1 and the pressure P 1 of the working gas in the gas volume calibration chamber 80 are measured, the number n 1 of moles of the remaining working gas in the gas volume calibration chamber 80 is calculated through the above-mentioned 2) according to the actual gas state equation,
8-3) After the gas temperature in the simulation chamber 10 is balanced at the temperature T, measuring the gas pressure P' in the simulation chamber 10, calibrating the change of the number of moles of the working gas in the chamber 80 based on the gas volume, and the change of the pressure of the working gas in the simulation chamber 10, and calculating the total empty space volume V y1 of the system according to the actual gas state equation by the following formula 3 a):
8-4) subtracting the system dead volume V s from the total empty space volume V y1 of the system, to obtain the initial void volume V f0 of the packing in the chamber 10, i.e. V y1-Vs＝Vf0,
8-5) Obtaining the initial porosity of the filler by calculating the ratio of the initial void volume V f0 to the net cavity volume V
In practice, step 10) comprises the steps of:
10-1) in the case where the gas path between the gas volume calibration chamber 80 and the simulation chamber 10 is cut off, the working gas is injected into the gas volume calibration chamber 80 until the pressure is within a preset range greater than the pressure of the simulation chamber 10, the temperature T 0 and the pressure P 0 of the working gas in the gas volume calibration chamber 80 are measured, the temperature T and the pressure P of the simulation chamber 10 are measured, the original number n 0 of moles of the working gas in the gas volume calibration chamber 80 is calculated by the above formula 1) according to the actual gas state equation,
10-2) Connecting the gas path between the gas volume calibration chamber 80 and the simulation chamber 10, disconnecting the gas path after the gas pressure balance and stabilization between the gas volume calibration chamber 80 and the simulation chamber 10 are achieved, measuring the temperature T 1 and the pressure P 1 of the working gas in the gas volume calibration chamber, calculating the number n 1 of moles of the working gas remaining in the gas volume calibration chamber 80 by the above formula 2) according to the actual gas state equation,
10-3) After the temperature of the gas in the simulation chamber 10 is balanced at the temperature T, measuring the pressure P' of the gas in the simulation chamber 10, calibrating the change of the number of moles of the working gas in the chamber 80 based on the volume of the gas, and the pressure change of the working gas in the simulation chamber 10, calculating the total empty space volume V y2 of the system according to the actual gas state equation by the following formula 3 b):
10-4) subtracting the system dead volume V s from the total empty space volume V y2 of the system, to obtain the void volume V f1 of the natural gas hydrate-containing packing in the simulation chamber 10, i.e. V y2-Vs＝Vf1,
10-5) Obtaining the porosity of the filler containing natural gas hydrate by calculating the ratio of the void volume V f1 to the net cavity volume V
10-6) Calculating the ratio of the difference of the initial void volume V f0 of the packing in the chamber of the simulation chamber 10 minus the void volume V f1 of the packing containing the natural gas hydrate to the initial void volume V f0 of the packing in the chamber of the simulation chamber 10 to obtain the saturation S H of the natural gas hydrate in the packing in the chamber of the simulation chamber 10, i.e. (V f0-Vf1)/Vf0＝SH).
In practice, step 9) comprises the steps of:
9-1) calculating the volume V Methane of methane gas to be fed in a standard state based on the initial void volume V f0 of the filler in the cavity of the simulation chamber 10 measured in the step 8) and the simulated target hydrate saturation s according to the following formula 4):
V Methane ＝164×Vf0×s 4)，
9-2) controlling the temperature in the chamber body of the simulation chamber 10 by the temperature control unit 40, reducing the temperature of the chamber body to within a set temperature range, and maintaining the constant temperature state,
9-3) According to the ideal gas state equation, the number of moles n Methane of methane gas required to be introduced is calculated according to the following formula 5):
9-4) purging the gas volume calibration chamber 80 with methane gas,
9-5) According to the volume V 0 of the gas volume calibration chamber 80 and the temperature T Methane of its current methane gas, methane gas is filled into the gas volume calibration chamber 80 by the pressure control unit 60 until the methane gas pressure in the gas volume calibration chamber 80 reaches a pressure value P Methane calculated according to the following formula 6) based on the actual gas state equation:
in formula 6), a Methane and b Methane are van der Waals corrections of methane gas (available from related specialized tool approaches),
9-6) Introducing working gas through the pressure control unit 60, pressing methane gas in the gas volume calibration chamber 80 into the cavity of the simulation chamber 10, and raising the gas pressure in the cavity of the simulation chamber 10 to a set pressure range, and maintaining the gas pressure in a constant pressure state to synthesize natural gas hydrate,
9-7) During and after the synthesis of the natural gas hydrate, the acoustic wave parameters and the resistivity parameters of the filler in the cavity of the simulation chamber 10 are monitored, recorded and displayed by the acoustic wave measuring unit 30 and the resistivity measuring unit 20,
9-8) When the acoustic wave and the resistivity parameter signals are in a continuous stable state, indicating that the natural gas hydrate generation and decomposition equilibrium state is reached, and stopping monitoring the acoustic wave parameters and the resistivity parameters.
In practical design, the initial permeability of step 7), the permeability of step 11) is calculated by the formulaCalculating, in this formula:
a is the cross-sectional area (unit cm 2) of the cavity inner cavity of the simulation chamber 10,
L is the length of the lumen (in cm) of the chamber body of the simulation chamber 10,
P in is the pressure at the gas input port of the chamber of the simulation chamber 10 (unit 0.1 MPa),
P out is the pressure (in 0.1 MPa) at the gas output port of the chamber of the simulation chamber 10,
P 00 is ambient atmospheric pressure (unit 0.1 MPa),
Mu is the viscosity (in mPas) of the working gas,
Q 0 is the gas flow (in cm 2/s) at the gas output port of the chamber of the simulation chamber 10.
In actual operation, in step 12):
The temperature and pressure of the cavity of the simulation chamber 10 are regulated and controlled to the temperature and pressure of the simulated natural gas hydrate reservoir by the temperature control unit 40 and the pressure control unit 60, and then the acoustic parameters and the resistivity parameters of the natural gas hydrate-containing filler under the reservoir environmental conditions are measured, recorded and displayed by the acoustic measurement unit 30 and the resistivity measurement unit 20.
The invention has the advantages that:
The method has the advantages of accurate and reliable test simulation results, high safety and convenient operation, aims at the simulated natural gas hydrate reservoir, obtains the association relation between the reservoir property parameters such as the porosity, the permeability, the hydrate saturation and the like of the reservoir and the geophysical parameters such as the acoustic wave and the resistivity and the like of the reservoir by a simulation experiment mode based on the acoustic wave and the electricity geophysical test principle, can effectively serve the resource evaluation and the mining engineering scheme design of the natural gas hydrate, and provides a reliable basis for data association for obtaining the in-situ state key reservoir property parameters of the natural gas hydrate reservoir by a geophysical test technical means.
The foregoing is a description of the preferred embodiments of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any modifications, equivalent changes, simple substitutions and the like based on the technical scheme of the present invention can be made without departing from the spirit and scope of the present invention.
Claims (7)
1. The natural gas hydrate reservoir in-situ property parameter simulation test system comprises a simulation chamber filled with filler, wherein the filler is used for simulating a natural gas hydrate reservoir; the simulation chamber is connected with the temperature measurement unit, the temperature control unit, the resistivity measurement unit, the permeability measurement unit, the acoustic wave measurement unit and the gas volume calibration chamber, the pressure control unit is connected with the simulation chamber and the gas volume calibration chamber, the gas volume calibration chamber is provided with a temperature sensor and a pressure sensor, the temperature measurement unit, the temperature control unit, the pressure control unit, the resistivity measurement unit, the permeability measurement unit and the acoustic wave measurement unit, and the temperature sensor and the pressure sensor of the gas volume calibration chamber are connected with the data processing and signal management and control unit, and the simulation test method for the natural gas hydrate reservoir in-situ property parameters is characterized by comprising the following steps:
1) The gas tightness of the system in an idle state is detected by using the working gas cleaning system;
2) Measuring the total space volume of the system in an idle state, and calibrating the dead volume of the system based on the volume of the clean cavity;
3) Preparing a filler for simulating a natural gas hydrate reservoir;
4) Filling the cavity of the simulation chamber with the prepared filler, and plugging two ports of the cavity through an injection plug and an output plug respectively;
5) Detecting the air tightness of the cavity in the loading state;
6) Cleaning the cavity of the simulation chamber filled with the filler by using working gas and a space communicated with the cavity;
7) Measuring and controlling the gas flow output by the cavity and measuring the pressure of the gas input and output ports of the cavity by the permeability measuring unit, and calculating the initial permeability of the filler in the cavity of the simulation chamber;
8) Measuring the total empty space volume of the system in the cavity loading state, and calculating the initial void volume of the filler in the cavity based on the calibrated dead volume of the system and the net cavity volume, so as to obtain the initial porosity of the filler;
9) Synthesizing natural gas hydrate, and monitoring acoustic parameters and resistivity parameters during and after synthesis;
10 Measuring the total empty space volume of the system after the synthesis of the natural gas hydrate is completed, and calculating the void volume of the filler containing the natural gas hydrate based on the calibrated dead volume and the clean cavity volume of the system, thereby obtaining the porosity of the filler containing the natural gas hydrate, and further calculating the saturation of the natural gas hydrate;
11 Measuring and controlling the gas flow output by the cavity and measuring the pressure of the gas input and output ports of the cavity by the permeability measuring unit, and calculating the permeability of the filler containing the natural gas hydrate;
12 Regulating the temperature and the pressure to the temperature and the pressure of the simulated natural gas hydrate reservoir, and measuring the acoustic parameters and the resistivity parameters of the filler containing the natural gas hydrate under the environmental conditions of the reservoir;
13 The simulation test of the natural gas hydrate reservoir in-situ property parameters is finished;
wherein, the step 9) comprises the following steps:
9-1) calculating the volume V Methane of methane gas to be introduced in a standard state based on the following formula 4) from the initial void volume V f0 of the filler in the cavity of the simulation chamber measured in the step 8) and the simulated target hydrate saturation s:
V Methane ＝164×Vf0×s 4)
9-2) controlling the temperature in the cavity of the simulation chamber by the temperature control unit to reduce the temperature of the cavity to be within a set temperature range and maintain the temperature in a constant temperature state,
9-3) According to the ideal gas state equation, the number of moles n Methane of methane gas required to be introduced is calculated according to the following formula 5):
9-4) purging the gas volume calibration chamber with methane gas,
9-5) According to the volume V 0 of the gas volume calibration chamber and the current methane gas temperature T Methane , filling methane gas into the gas volume calibration chamber through the pressure control unit until the methane gas pressure in the gas volume calibration chamber reaches a pressure value P Methane calculated according to the actual gas state equation and expressed by the following formula 6):
In formula 6), a Methane and b Methane are van der Waals correction amounts of methane gas, R is a universal gas constant,
9-6) Introducing working gas through the pressure control unit, pressing methane gas in the gas volume calibration chamber into the simulation chamber cavity, raising the gas pressure in the simulation chamber cavity to a set pressure range, maintaining the gas pressure in a constant pressure state to synthesize natural gas hydrate,
9-7) Monitoring, recording and displaying the acoustic wave parameters and the resistivity parameters of the filler in the cavity of the simulation chamber through the acoustic wave measuring unit and the resistivity measuring unit during and after the synthesis of the natural gas hydrate,
9-8) When the acoustic wave and the resistivity parameter signals are in a continuous stable state, indicating that the natural gas hydrate generation and decomposition equilibrium state is reached, and stopping monitoring the acoustic wave parameters and the resistivity parameters.
2. The method for simulating the testing of natural gas hydrate reservoir in-situ property parameters as claimed in claim 1, wherein:
Said step 2) comprises the steps of:
2-1) when it is confirmed that the simulation chamber and the gas volume calibration chamber in the idle state of the system are communicated with each other, but are closed to the outside, the gas path between the gas volume calibration chamber and the simulation chamber is cut off, working gas is injected into the gas volume calibration chamber until the pressure is within a set range, the temperature T 0 and the pressure P 0 of the working gas in the gas volume calibration chamber are measured, the temperature T and the pressure P of the simulation chamber are measured, and the original mole number n 0 of the working gas in the gas volume calibration chamber is calculated by the following formula 1) according to the actual gas state equation:
in the formula 1), V 0 is the volume of the gas volume calibration chamber, R is a universal gas constant, a and b are Van der Waals correction amounts of working gas,
2-2) Connecting the gas path between the gas volume calibration chamber and the simulation chamber, disconnecting the gas path after the gas pressure balance and stabilization between the gas volume calibration chamber and the simulation chamber are achieved, measuring the temperature T 1 and the pressure P 1 of the working gas in the gas volume calibration chamber, and calculating the mole number n 1 of the residual working gas in the gas volume calibration chamber according to the actual gas state equation by the following formula 2):
2-3) measuring the pressure P' of the simulated indoor gas after the temperature of the simulated indoor gas is balanced at the temperature T, calibrating the change of the number of moles of the indoor working gas based on the gas volume, and calculating the total space volume V of the system according to an actual gas state equation by the following formula 3):
2-4) subtracting the net cavity volume V' from the total space volume V of the system to obtain a system dead volume V s;
said step 8) comprises the steps of:
8-1) in case that it is confirmed that the simulation chamber filled with the filler and the gas volume calibration chamber are communicated with each other but are closed to the outside, cutting off a gas path between the gas volume calibration chamber and the simulation chamber, injecting a working gas into the gas volume calibration chamber until a pressure is within a predetermined range, measuring a temperature T 0 and a pressure P 0 of the working gas in the gas volume calibration chamber, measuring the temperature T and the pressure P of the simulation chamber, calculating an original mole number n 0 of the working gas in the gas volume calibration chamber by the above formula 1) according to an actual gas state equation,
8-2) A gas path between the gas volume calibration chamber and the simulation chamber is communicated, after the gas pressure balance and stabilization are achieved between the gas volume calibration chamber and the simulation chamber, the gas path is disconnected, the temperature T 1 and the pressure P 1 of the working gas in the gas volume calibration chamber are measured, the number n 1 of the moles of the residual working gas in the gas volume calibration chamber is calculated according to an actual gas state equation by the formula 2) above,
8-3) Measuring the pressure P' of the simulated indoor gas after the temperature of the simulated indoor gas is balanced at the temperature T, calibrating the change of the number of moles of the indoor working gas based on the gas volume, and calculating the total empty space volume V y1 of the system according to the actual gas state equation through the following formula 3 a):
8-4) subtracting the system dead volume V s from the total empty space volume V y1 of the system to obtain the initial void volume V f0 of the packing in the simulated chamber cavity,
8-5) Obtaining the initial porosity of the filler by calculating the ratio of the initial void volume V f0 to the net cavity volume V
Said step 10) comprises the steps of:
10-1) under the condition that an air path between the gas volume calibration chamber and the simulation chamber is cut off, injecting working gas into the gas volume calibration chamber until the pressure is within a preset range which is greater than the pressure of the simulation chamber, measuring the temperature T 0 and the pressure P 0 of the working gas in the gas volume calibration chamber, measuring the temperature T and the pressure P of the simulation chamber, calculating the original mole number n 0 of the working gas in the gas volume calibration chamber according to an actual gas state equation by the formula 1) above,
10-2) Connecting the gas path between the gas volume calibration chamber and the simulation chamber, disconnecting the gas path after the gas pressure balance and stabilization between the gas volume calibration chamber and the simulation chamber are achieved, measuring the temperature T 1 and the pressure P 1 of the working gas in the gas volume calibration chamber, calculating the mole number n 1 of the residual working gas in the gas volume calibration chamber according to the actual gas state equation by the formula 2) above,
10-3) Measuring the pressure P' of the simulated indoor gas after the temperature of the simulated indoor gas is balanced at the temperature T, calibrating the change of the number of moles of the indoor working gas based on the gas volume, and calculating the total empty space volume V y2 of the system according to the actual gas state equation through the following formula 3 b):
10-4) subtracting the system dead volume V s from the total empty space volume V y2 of the system to obtain the void volume V f1 of the natural gas hydrate-containing packing in the simulation chamber,
10-5) Obtaining the porosity of the natural gas hydrate-containing filler by calculating the ratio of void volume V f1 to the net cavity volume V
10-6) Calculating the ratio of the difference of the initial void volume V f0 of the filler in the simulated chamber cavity minus the void volume V f1 of the filler containing the natural gas hydrate to the initial void volume V f0 of the filler in the simulated chamber cavity to obtain the saturation S H of the natural gas hydrate in the filler in the simulated chamber cavity.
3. The method for simulating the testing of natural gas hydrate reservoir in-situ property parameters as claimed in claim 1, wherein:
said step 3) comprises the steps of:
3-1) taking the sediment from the natural gas hydrate reservoir to be simulated or the sediment prepared for simulating the natural gas hydrate reservoir to be simulated, fully wetting and uniformly mixing the reservoir water from the natural gas hydrate reservoir to be simulated or the reservoir water prepared for simulating the natural gas hydrate reservoir to be simulated,
3-2) Freezing the sediment of the natural gas hydrate reservoir to be simulated which contains water or the sediment which contains water and is prepared for simulating the natural gas hydrate reservoir to be simulated at the temperature below-7 ℃ until the water is completely frozen to form ice and sand,
3-3) Mashing the ice sand, uniformly mixing, and continuously freezing at low temperature for standby.
4. The method for simulating the testing of natural gas hydrate reservoir in-situ property parameters as claimed in claim 1, wherein:
The initial permeability of the step 7) and the permeability of the step 11) pass through the formula Calculating, in the formula:
a is the sectional area of the cavity inner cavity of the simulation chamber,
L is the length of the inner cavity of the simulation chamber cavity,
P in is the pressure at the gas input port of the simulation chamber cavity,
P out is the pressure at the gas output port of the simulation chamber cavity,
P 00 is the ambient atmospheric pressure and,
Mu is the viscosity of the working gas and,
Q 0 is the gas flow at the gas output port of the analog chamber cavity.
5. The method for simulating the testing of natural gas hydrate reservoir in-situ property parameters as claimed in claim 1, wherein:
the simulation chamber comprises a cavity, two ports of the cavity are respectively provided with an injection plug and an output plug, the inner wall of the cavity is made of insulating materials, and anti-blocking filter screens are arranged in the injection ports of the injection plugs and the output ports of the output plugs.
6. The method for simulating the testing of natural gas hydrate reservoir in-situ property parameters as claimed in claim 5, wherein:
The temperature control unit comprises a refrigerating fluid jacket which is tightly attached to the outer wall of the cavity, the refrigerating fluid jacket is connected with a refrigerating fluid supply and transmission flow path, and an insulating layer is arranged outside the refrigerating fluid jacket;
the temperature measuring unit comprises a plurality of temperature sensors arranged on the inner wall of the cavity and a plurality of temperature sensors arranged on the outer wall of the cavity and between the cavity and the refrigeration fluid jacket;
The pressure control unit comprises a gas pressure regulating valve and a pressurizing assembly; the gas transmission inlet of the pressurizing assembly is connected with a methane gas source and a working gas source through a first multi-way control valve, and the gas transmission outlet of the pressurizing assembly is connected with the gas inlet of the gas pressure regulating valve; the air outlet of the air pressure regulating valve is connected with the air inlet of the second multi-way control valve, one air outlet of the second multi-way control valve is connected with the injection port of the injection plug, and the other air outlet of the second multi-way control valve is connected with the air inlet of the air volume calibration chamber; the gas outlet of the gas volume calibration chamber, the discharge port penetrating the outside and the injection port of the injection plug are connected through a third multi-way control valve;
The resistivity measuring unit comprises a plurality of circles of resistivity measuring electrodes which are annularly distributed on the cavity and insulated from the cavity, and the resistivity measuring electrodes are connected with a resistivity measuring device, wherein: each circle of resistivity measuring electrodes are uniformly distributed at equal intervals along the length direction of the simulation chamber; a plurality of resistivity measuring points are uniformly arranged on each circle of resistivity measuring electrode, and probes on the resistivity measuring points penetrate through the cavity body and penetrate into the cavity;
The sound wave measuring unit comprises a plurality of pairs of oppositely installed sound dipoles arranged on the inner wall of the cavity, each pair of sound dipoles are uniformly distributed at the middle section of the cavity at equal intervals along the length direction of the simulation chamber, wherein: for each pair of acoustic dipoles, one acoustic dipole penetrates through the cavity to be connected with the acoustic wave transmitting device, and the other acoustic dipole penetrates through the cavity to be connected with the acoustic wave receiving device;
The permeability measuring unit comprises a gas pressure measuring meter connected with an injection port of the injection plug, and an output gas flow measuring and controlling valve and a gas pressure measuring meter connected with an output port of the output plug.
7. The method for simulating the testing of natural gas hydrate reservoir in-situ property parameters as claimed in claim 6, wherein:
The pressurizing assembly comprises a pressurizing pump, an air inlet of the pressurizing pump is connected with the methane air source and the working air source through the first multi-way control valve, an air outlet of the pressurizing pump is connected with an air inlet of the air pressure regulating valve through a high-pressure air storage tank, and a back pressure valve for preventing fluid from returning is arranged at the air inlet of the pressurizing pump, the air inlet of the high-pressure air storage tank and the air outlet of the pressurizing pump; the booster pump is connected with an air compressor to work under the auxiliary drive of the air compressor.
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