CN106640060B - Simulation experiment method for natural gas reservoir multilayer commingled production capacity - Google Patents
Simulation experiment method for natural gas reservoir multilayer commingled production capacity Download PDFInfo
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- CN106640060B CN106640060B CN201610855075.7A CN201610855075A CN106640060B CN 106640060 B CN106640060 B CN 106640060B CN 201610855075 A CN201610855075 A CN 201610855075A CN 106640060 B CN106640060 B CN 106640060B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
Abstract
The invention aims to provide a natural gas reservoir multilayer commingled production capacity simulation experiment method which is convenient to operate and can accurately simulate quantitative evaluation of gas production capacity under the condition of a multilayer commingled production operation process of multiple natural gas production layers. The invention discloses a simulation experiment method for multilayer combined production capacity of a natural gas reservoir, which comprises a plurality of pressure-containing gas cylinders, wherein the gas outlet of each pressure-containing gas cylinder is respectively connected with the gas inlet of a pressure reducing valve, the gas outlet of each pressure reducing valve is respectively connected with the gas inlet on the barrel of a core holder, the wall of the barrel of each core holder is respectively provided with a temperature measuring device and a confining pressure measuring device, the gas outlet of each core holder barrel is respectively connected with the inlet of a two-way valve through a pipeline which is connected with a branch pipe back pressure valve and a branch pipe flowmeter in series, one outlet of each two-way valve is respectively connected with the lower part of a cylindrical container through a pipeline, and the top of the cylindrical container is connected with the outside atmosphere through a pipeline which is connected with.
Description
Technical Field
The invention relates to the field of petroleum engineering, in particular to single-well multi-layer commingled production gas productivity evaluation of various natural gas reservoirs such as sandstone gas, coal bed gas, shale gas and the like, and particularly relates to a simulation experiment method for multi-layer commingled production capacity of a natural gas reservoir.
Background
For various natural gas reservoir vertical distribution resource areas such as sandstone gas, coal bed gas, shale gas and the like in the vertical direction, a plurality of stratums are mined simultaneously through a single well, the single well productivity can be effectively improved, the gas well operation cost is reduced, and the natural gas resource development period is saved. At present, the co-production engineering practice of multiple natural gas reservoirs is developed in domestic areas represented by the Erdos basin Daniu land and the clinical prosperity, but the co-production process has interlayer interference relative to multi-layer separate production, so that the co-production capacity is reduced.
In practice, it is found that, different types of strata and strata in different intervals of the same type have different commingled production interference degrees, how to reduce the interference of the multi-layer commingled production by optimizing the type of the commingled production gas layer, the depth of the commingled production gas layer and other methods, and firstly, an interference degree evaluation method capable of effectively simulating the actual conditions of the on-site multi-layer commingled production needs to be established. At present, some scholars at home and abroad try to establish an indoor experimental method to evaluate the degree of multi-layer commingled mining interference, but the distance between the experimental process and the actual field development is large, so that the evaluation result cannot effectively guide the field development. Therefore, an indoor evaluation experiment method capable of effectively representing the co-production interference degree of on-site multiple types of natural gas reservoirs is urgently needed.
Disclosure of Invention
The invention aims to provide a natural gas reservoir multi-layer commingled production capacity simulation experiment method which has intuitive experiment results, is convenient to operate, has strong independence of simulation of each single layer in an experiment device, and can accurately simulate gas production capacity under the condition of multi-natural gas production layer multi-layer commingled production operation process.
The invention relates to a simulation experiment method for multilayer commingled production capacity of a natural gas reservoir, which comprises the following steps of:
A. setting the same number of pressure gas containing cylinders according to the number of natural gas reservoirs to be simulated, wherein the pressure gas containing cylinders are filled with nitrogen or air;
B. the gas outlet of each pressure-containing gas cylinder is connected with the gas inlet of a pressure reducing valve through a pipeline which is connected with a one-way valve in series, the gas outlet of each pressure reducing valve is connected with the gas inlet on the barrel of a core holder through a pipeline, the wall of the barrel of each core holder is provided with a temperature measuring device and a confining pressure measuring device, the gas outlet of the barrel of each core holder is connected with the inlet of a two-way valve through a pipeline which is connected with a branch pipe back pressure valve and a branch pipe flowmeter in series, one outlet of each two-way valve is connected with the lower part of a cylindrical container through a pipeline, the other outlet of each two-way valve is connected with the external atmosphere, the cylindrical container is arranged along the vertical direction, and the top of the cylindrical container is connected with the external atmosphere through a pipeline which is connected with;
C. preparing core plungers with the same quantity as the core holders, and cleaning, drying and vacuumizing the core plungers;
D. a core plunger which is cleaned, dried and vacuumized is arranged in the cylinder of each core holder;
E. according to the formation temperature of each formation to be simulated, the corresponding core plunger temperature is consistent with the formation temperature to be simulated;
F. connecting the pressure gas in each pressure gas cylinder into a corresponding pipeline which is connected with a one-way valve in series, regulating and controlling the pressure of the gas in the pipeline by using a corresponding pressure reducing valve according to the pressure of each stratum to be simulated, and enabling the confining pressure of a corresponding core plunger to be consistent with the pressure of the stratum to be simulated;
G. enabling the outlet pressure of the air outlet of each core holder cylinder to be consistent with the pressure of a gas production oil pipe to be simulated;
H. when the pressure of the pressure gas containing bottle naturally attenuates to a certain value which is larger than the fixed pressure of the plunger inlet, the gas flow velocity of the gas outlet of the cylinder of each rock core holder is obtained;
I. and under the condition that the temperature, the confining pressure and the inlet and outlet pressure in the cylinder of each core holder are kept unchanged, one outlet of each two-way valve is communicated with the lower part of the cylindrical container through a pipeline, the inlet pressure of the cylindrical container is controlled to be consistent with the gas production oil pressure to be simulated, the outlet gas flow rate of the cylindrical container is obtained, and the capacity of simulating the multilayer combined production of the natural gas reservoir can be completed.
Preferably, the diameter of the inner cavity of the barrel of the core holder is 25mm or 38mm or 50mm or 75mm or 100 mm.
Preferably, the pressure capacity gas cylinder is a high-pressure constant-volume gas cylinder.
The natural gas reservoir multi-layer commingled production capacity simulation experiment method has the following beneficial effects:
the invention uses the core plunger to simulate the actual stratum, uses the confining pressure instrument to apply plunger confining pressure to simulate the pressure of rock overlying the stratum, and uses the numerical control temperature instrument to apply plunger temperature to simulate the temperature of the stratum. The pressure of gas at the inlet of the plunger is controlled to be constant by the pressure reducing valve, and the pressure of gas at the outlet of the plunger is controlled to be constant by the backpressure valve, so that the gas pressure difference at the two ends of the plunger is stable. And filling air or nitrogen into the constant-volume high-pressure gas cylinder until the pressure is higher than the pressure of the plunger inlet, and simulating the far-end energy of the stratum. And connecting the high-pressure gas cylinder into a core plunger to simulate the energy attenuation type supply of the far end of the stratum on site to the near-well section. And by controlling the independent outlets of the core plungers, the development of the separate mining of a plurality of strata is simulated. The temperature and the pressure of the core plunger and the pressure attenuation interval of the high-pressure gas cylinder are controlled to be the same, and the core plungers are connected to the same pipeline in parallel to simulate the joint production and development of a plurality of strata. The change of the gas flow speed at the outlet of the plunger in the same range of the pressure attenuation of the high-pressure gas cylinder in the two modes is measured in an experiment. And (3) representing the gas productivity by the average gas flow rate in the period, calculating the reduction amplitude of the average gas flow rate of the multi-layer combined mining main pipeline relative to the sum of the average gas flow rates of all plunger outlets of the multi-layer separate mining, and representing the interference degree of the multi-layer combined mining relative separate mining.
The natural gas reservoir multilayer commingled production capacity simulation experiment method is applied to the field of petroleum engineering, particularly single-well multilayer commingled production gas capacity evaluation of various natural gas reservoirs such as sandstone gas, coal bed gas, shale gas and the like, successfully realizes quantitative evaluation of gas production capacity under the condition of indoor accurate simulation of the multilayer commingled production operation process of multiple natural gas production layers, can respectively perform any number of combined simulations on each single layer, and has very visual experiment result and convenient operation. Therefore, the natural gas reservoir multilayer commingled production capacity simulation experiment method has the characteristics of visual experiment results, convenience in operation and capability of accurately simulating gas production capacity under the condition of a multilayer commingled production operation process of multiple natural gas production layers.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a simulation experiment method for the multi-layer commingled production capacity of a natural gas reservoir according to the invention;
FIG. 2 is a graph showing the data of the gas flow rate with time in a simulation experiment for the development of a three-zone multi-layer.
Detailed Description
The method can be used for evaluating the interference effect of the multilayer commingled production capacity of the natural gas stratum. The method is characterized in that the change rule of the flow velocity of gas at the outlets of a plurality of stratums along with time in a plurality of natural gas producing and layer combining exploitation modes is measured under the indoor simulation of the temperature and pressure environment of each producing layer and the stratum far-end energy attenuation mode. And (3) representing the evaluation method of the formation gas productivity of the multi-production layer combined mining mode by using the average flow velocity of the gas at the outlet of the producing layer within the same amplitude of the reduction of the formation energy. The evaluation result is close to the actual condition of multilayer commingled production of a plurality of natural gas strata, the representation of stratum productivity is visual and accurate, and the evaluation method is simple and convenient to operate and good in reproducibility.
As shown in fig. 1, the natural gas reservoir multilayer commingled production capacity simulation experiment method of the invention comprises the following steps:
A. according to the number of natural gas reservoirs to be simulated, arranging the same number of pressure gas cylinders 1, wherein the pressure gas cylinders 1 are filled with nitrogen or air;
b, the number of the first and second groups, the gas outlet of each pressure-containing gas cylinder 1 is connected with the gas inlet of a pressure reducing valve 3 through a pipeline which is connected with a one-way valve 2 in series, the gas outlet of each pressure reducing valve 3 is connected with the gas inlet on the barrel of a core holder 4 through a pipeline, the wall of the barrel of each core holder 4 is provided with a temperature measuring device 5 and a confining pressure measuring device 6, the gas outlet of the barrel of each core holder 4 is connected with the inlet of a two-way valve 9 through a pipeline which is connected with a branch pipe backpressure valve 7 and a branch pipe flowmeter 8 in series, one outlet of each two-way valve 9 is connected with the lower part of a cylindrical container 10 through a pipeline, the other outlet of each two-way valve 9 is connected with the outside atmosphere, the cylindrical container 10 is arranged along the vertical direction, and the top of the cylindrical container 10 is connected with the outside atmosphere through a pipeline which is connected with a main pipe backpressure;
C. preparing core plungers with the same quantity as the core holders 4, and cleaning, drying and vacuumizing the core plungers;
D. a core plunger which is cleaned, dried and vacuumized is arranged in the cylinder body of each core holder 4;
E. according to the formation temperature of each formation to be simulated, the corresponding core plunger temperature is consistent with the formation temperature to be simulated;
F. the pressure gas in each pressure gas cylinder 1 is connected into a corresponding pipeline which is connected with a one-way valve 2 in series, and the pressure of the gas in the pipeline is regulated and controlled by a corresponding pressure reducing valve 3 according to the pressure of each stratum to be simulated, so that the confining pressure of a corresponding core plunger is consistent with the pressure of the stratum to be simulated;
G. the outlet pressure of the air outlet of the cylinder body of each core holder 4 is consistent with the pressure of the gas production oil pipe to be simulated;
H. when the pressure of the pressure gas cylinder 1 naturally attenuates to a certain value which is larger than the fixed pressure of the plunger inlet, the gas flow velocity of the gas outlet of the cylinder body of each core holder 4 is obtained;
I. and under the condition that the temperature, the confining pressure and the inlet and outlet pressure in the cylinder of each core holder 4 are kept unchanged, one outlet of each two-way valve 9 is communicated with the lower part of the cylindrical container 10 through a pipeline, the inlet pressure of the cylindrical container 10 is controlled to be consistent with the gas production oil pressure to be simulated, the gas flow rate at the outlet of the cylindrical container 10 is obtained, and the capacity of simulating the multilayer combined production of the natural gas reservoir can be completed.
As a further development of the invention, the diameter of the inner chamber of the barrel of the core holder 4 is 25mm or 38mm or 50mm or 75mm or 100 mm.
As a further improvement of the invention, the pressure capacity gas cylinder is a high-pressure constant-volume gas cylinder.
The following details an example of three producing stratum simulated by the natural gas reservoir multi-layer commingled production capacity simulation experiment method
The three formation parameters simulated are shown in table 1.
TABLE 1 producing zone stratigraphic parameters
Example 1
Development of two-joint of first and second producing zones
In order to simulate the three production zones, three pressure-containing gas cylinders 1 need to be used, and as shown in fig. 1, the serial numbers of the three pressure-containing gas cylinders 1 are respectively gas cylinder eleven, gas cylinder twelve and gas cylinder thirteen, wherein the gas cylinder eleven corresponds to the stratum serial number a, the gas cylinder twelve corresponds to the stratum serial number B, and the gas cylinder thirteen corresponds to the stratum serial number C.
Setting the initial pressure of the eleven gas cylinders to be 30MPa and the confining pressure of the core holder connected with the eleven gas cylinders to be 16 MPa. And (3) loading a core plunger with the diameter of 25mm into the core holder, setting the temperature of the core plunger to be 46 ℃, and keeping the pressure of an air inlet of a barrel of the core holder to be constant at 13 MPa.
Setting the initial pressure of a gas cylinder twelve at 30MPa and the confining pressure of a core holder connected with the gas cylinder twelve at 18 MPa. And (3) loading a core plunger with the diameter of 25mm into the core holder, setting the temperature of the core plunger to be 48 ℃, and keeping the pressure of an air inlet of a barrel of the core holder to be constant at 15 MP.
Setting the initial pressure of a gas cylinder thirteen to be 30MPa and the confining pressure of a core holder connected with the gas cylinder thirteen to be 20 MPa. And (3) loading a core plunger with the diameter of 25mm into the core holder, setting the temperature of the plunger to be 50 ℃, and keeping the pressure of an air inlet of a barrel of the core holder to be constant at 17 MPa.
Three two-way valves are used to convey pressure gas to the cylindrical container 10, and the pressure of a back pressure valve of a main pipeline is controlled to be 4MPa, so that the three-production-layer combined mining development can be simulated.
The results are shown in Table 2. Recording the continuous change of the readings of the main flowmeter 12 during the eleven, twelve and thirteen pressure attenuations of the gas cylinders to 28MPa, and calculating the average flow rate Q of the gas at the combined production outlet of the three production layers in the perioda。
The data of the change of the gas flow velocity with time in the three-production layer multi-layer development simulation experiment are recorded, and the data are shown in figure 2
The combined production gas capacity is characterized by the average flow rate of the main pipeline outlet within the pressure attenuation range, and is shown in table 2.
TABLE 2 simulation data of the three-yield layer mining energy
| Calculating parameters | Calculating a numerical value |
| Total flow rate of three-layer combined production gas | 3441.18mL/min |
Example 2
(1) And determining the number of the core plungers for the indoor simulation experiment according to the number of the commingled production strata.
(2) And (3) completing early-stage cleaning, drying and vacuumizing treatment of the experimental core plunger, and then putting the experimental core plunger into a corresponding core holder.
(3) According to the measured data of the on-site stratum, the temperature of the core plunger is controlled to be consistent with the temperature of the stratum, and the confining pressure of the plunger is controlled to be consistent with the stress of the rock overlying the stratum. And controlling the inlet pressure of the core plunger to be consistent with the field formation pressure, and controlling the outlet pressure of the core plunger to be consistent with the field gas production oil pipe pressure.
(4) And (3) connecting the inlet of each core holder into a high-pressure gas cylinder with a fixed volume, and filling the gas cylinder with nitrogen or air until the initial pressure value is greater than the actual stratum pressure value of the corresponding stratum.
(5) And opening the inlet of the core holder and a valve of the high-pressure gas cylinder, controlling the pressure of the high-pressure gas cylinder to naturally attenuate to a value greater than the fixed pressure of the inlet of the plunger piston, recording the continuous change of the gas flow rate at the outlet of the holder, and calculating the average gas flow rate value in a period.
(6) And under the condition of keeping the temperature, confining pressure and inlet and outlet pressure of the core holder unchanged after the separate mining experiment is finished, connecting the outlet of the holder in parallel to the main pipeline, and controlling the inlet pressure of the main pipeline to be consistent with the on-site gas production oil pressure.
(7) And (3) connecting the inlet of each core holder into a high-pressure gas cylinder filled with gas until the pressure is consistent with the initial pressure value of the gas cylinder in the layering experiment, opening a valve at the inlet of the gas cylinder and the holder, and recording the continuous change of the gas flow speed in the main pipeline when the gas pressure in the high-pressure gas cylinder is naturally attenuated to the same value in the single-layer experiment.
(8) And (3) representing the capacity of joint production by using the average flow velocity of the gas in the main pipeline in a joint production mode, and calculating the reduction amplitude of the gas capacity of the multilayer joint production relative to the multilayer separate production, namely the interference degree of the gas capacity.
Example 3
The three formation parameters simulated by the evaluation apparatus are shown in table 3.
TABLE 3 producing zone stratigraphic parameters
Joint development of pay zone A, pay zone B and pay zone C
Taking three sets of multi-zone comprehensive development productivity evaluation experimental devices connected in parallel with a single-zone development simulation device as an example, as shown in fig. 1 of the attached drawing of the specification, a simulated zone a, a simulated zone B and a simulated zone C are jointly developed.
Setting the initial pressure of eleven gas cylinders to be 25MPa and setting the confining pressure of a rock core holder of a producing zone A to be 18 MPa. And (3) loading a core plunger with the diameter of 25mm into the core holder, and setting the plunger temperature to be 48 ℃, the inlet pressure to be constant to be 16MPa and the outlet pressure to be constant to be 3 MPa.
Setting the initial pressure of a gas cylinder twelve to be 25MPa and setting the confining pressure of a core holder of a producing zone B to be 19 MPa. And (3) loading a core plunger with the diameter of 25mm into the core holder, and setting the plunger temperature to be 49 ℃, the inlet pressure to be constant to be 17MPa and the outlet pressure to be constant to be 3 MPa.
Setting the initial pressure of a thirteen gas cylinder to be 25MPa and setting the confining pressure of a rock core holder of a producing zone C to be 20 MPa. And (3) loading a core plunger with the diameter of 25mm into the core holder, and setting the plunger temperature to be 50 ℃, the inlet pressure to be constant to be 18MPa and the outlet pressure to be constant to be 3 MPa.
The pipeline is connected according to the mode of figure 1 of the attached figure of the specification. The three two-way valves 9 are all connected upwards, and then the three valves are opened to simulate the layered development of three producing layers. Recording the continuous change of readings of the three branch pipe flow meters 8 during the eleven, twelve and thirteen pressure decays of the gas cylinders to 20MPa, and calculating the average flow rates Qs1, Qs2 and Qs3 of the gas at the outlets of the three producing zones in the period and the total flow rate Qs of the partial production.
The pressure of the gas cylinder is repeatedly set to 25MPa, and the temperature, the pressure stabilization and the inlet pressure of the core plunger for the simulated formation of the three producing layers are unchanged. Three two-way valves 9 are all connected downwards, and the pressure of a back pressure valve of a main pipeline is controlled to be 3 MPa. And opening three valves to simulate the combined mining development of three production layers.
The results are shown in Table 4. Recording the continuous change of the readings of the main flowmeter 12 during the eleven, twelve and thirteen pressure decays to 20MPa of the gas cylinders, and calculating the average flow rate Qa of the gas at the three production layer combined production outlets in the period.
The data of the multilayer development simulation experiment of the three-production layer are recorded and shown in table 4.
TABLE 4 simulation data for the multi-layer development of the three-product layer
| Calculating parameters | Calculating a numerical value |
| Total flow rate of gases for layered development | 2563.46mL/min |
| Total flow rate of three-layer combined production gas | 2403.51mL/min |
| Degree of interference | 6.24％ |
The method simulates the reduction amplitude of the total energy of the multi-layer co-production gas relative to the sum of the productivity of the multi-layer separate production gas under the conditions of actual temperature of a plurality of natural gas strata and overlying rock pressure environment through experiments, wherein the energy supply intervals at the far ends of the strata are the same, and the total energy of the multi-layer co-production gas is reduced relative to the sum of the productivity of the multi-layer separate production gas under the condition of constant pressure difference production at two ends of the strata, so that the.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. The simulation experiment method for the multilayer commingled production capacity of the natural gas reservoir is characterized by comprising the following steps of: which comprises the following steps:
A. according to the number of natural gas reservoirs to be simulated, arranging the same number of pressure-containing gas cylinders (1), wherein the pressure-containing gas cylinders (1) are filled with nitrogen or air;
B. the gas outlet of each pressure gas cylinder (1) is connected with the gas inlet of a pressure reducing valve (3) through a pipeline which is connected with a one-way valve (2) in series, the gas outlet of each pressure reducing valve (3) is connected with the gas inlet on the barrel of a core holder (4) through a pipeline, the wall of the barrel of each core holder (4) is provided with a temperature measuring device (5) and a confining pressure measuring device (6) respectively, the gas outlet of the barrel of each core holder (4) is connected with the inlet of a two-way valve (9) through a pipeline which is connected with a branch pipe backpressure valve (7) and a branch pipe flowmeter (8) in series, one outlet of each two-way valve (9) is connected with the lower part of a cylindrical container (10) through a pipeline, the other outlet of each two-way valve (9) is connected with the outside atmosphere, the cylindrical container (10) is arranged along the vertical direction, the top of the cylindrical container (10) is connected with the outside atmosphere through a pipeline which is connected with a main pipe backpressure valve (11) and a main pipe flowmeter (12) in series;
C. preparing core plungers with the same quantity as the core holders (4), and cleaning, drying and vacuumizing the core plungers;
D. a core plunger which is cleaned, dried and vacuumized is arranged in the cylinder body of each core holder (4);
E. according to the formation temperature of each formation to be simulated, the corresponding core plunger temperature is consistent with the formation temperature to be simulated;
F. the pressure gas in each pressure gas cylinder (1) is connected into a corresponding pipeline which is connected with a one-way valve (2) in series, and the pressure of the gas in the pipeline is regulated and controlled by a corresponding pressure reducing valve (3) according to the stratum pressure to be simulated, so that the confining pressure of a corresponding core plunger is consistent with the stratum pressure to be simulated;
G. the outlet pressure of the air outlet of the cylinder body of each core holder (4) is consistent with the pressure of the gas production oil pipe to be simulated;
H. when the pressure of the pressure gas cylinder (1) naturally attenuates to a certain value which is greater than the fixed pressure of the plunger inlet, the gas flow velocity of the gas outlet of the cylinder body of each core holder (4) is obtained;
I. and under the condition that the temperature, the confining pressure and the inlet and outlet pressure in the cylinder of each core holder (4) are kept unchanged, one outlet of each two-way valve (9) is communicated with the lower part of the cylindrical container (10) through a pipeline, the inlet pressure of the cylindrical container (10) is controlled to be consistent with the gas production oil pressure to be simulated, the outlet gas flow rate of the cylindrical container (10) is obtained, and the capacity of simulating the multilayer co-production of the natural gas reservoir can be completed.
2. The natural gas reservoir multi-layer commingled production capacity simulation experiment method of claim 1, wherein: the diameter of the inner cavity of the barrel of the core holder (4) is 25mm or 38mm or 50mm or 75mm or 100 mm.
3. The natural gas reservoir multi-layer commingled production capacity simulation experiment method of claim 2, wherein: the pressure gas cylinder is a high-pressure constant-volume gas cylinder.
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