CN108627437B - Gas micro-flow measuring device and method under reservoir conditions for experiment - Google Patents
Gas micro-flow measuring device and method under reservoir conditions for experiment Download PDFInfo
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- CN108627437B CN108627437B CN201710174277.XA CN201710174277A CN108627437B CN 108627437 B CN108627437 B CN 108627437B CN 201710174277 A CN201710174277 A CN 201710174277A CN 108627437 B CN108627437 B CN 108627437B
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- 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
Abstract
The invention discloses a gas micro-flow measuring device and method under reservoir conditions for experiments, wherein the device comprises: a sapphire tube; the inlet end connector is connected to one end of the sapphire pipe and comprises an inlet end gas inlet and an inlet end liquid inlet; the outlet end joint is connected to the other end of the sapphire pipe and comprises an outlet end air inlet; the first injection pump is arranged at the inlet end; the liquid intermediate container is arranged between the first injection pump and the inlet end liquid inlet; the second injection pump is arranged at the outlet end; and the gas pressure container is arranged between the second injection pump and the outlet end gas inlet. The device has the advantages that: the operation method is simple and convenient, and has a high-precision test result.
Description
Technical Field
The invention relates to the technical field of oil and gas field development experiments, in particular to a gas micro-flow measuring device and method under reservoir conditions for experiments.
Background
The permeability of the core is an important parameter for reservoir evaluation, while the permeability of the compact core or shale core is very low, the flow speed of gas in the core is very slow, and the flow of the gas is difficult to accurately measure, which brings great difficulty to the physical property parameter test of the core. Moreover, most of the existing core permeability tests are carried out under the conditions of normal temperature and atmospheric pressure at an outlet, which cannot represent the seepage characteristics of gas in the core under the reservoir condition, so that the flow velocity of the gas in the compact core under the reservoir condition needs to be accurately measured.
In most of the indoor experiments, an indirect method is adopted to measure the gas flow under the reservoir conditions, and the current method of the indoor experiments is as follows: the method comprises the steps that after gas under reservoir conditions passes through a back pressure valve, the flow of the gas is calculated by measuring the time of soap foam passing through a flow pipe under atmospheric pressure, and the flow measuring method is large in artificial error, and is also large in error because the flow of the gas is difficult to keep stable and continuous when the gas passes through the back pressure valve; the throttling capillary method is also used for converting gas under reservoir conditions into atmospheric pressure for measurement, and the flow of the pressurized gas cannot be measured; the micro gas flow measuring device adopts a float type gas flowmeter, and is not suitable for measuring the flow of gas under pressure; the gas flowmeter adopts a sensor assembly in a gas pipeline to measure gas flow, when the flow is small, the requirement on the accuracy of the sensor assembly is high, and when the gas pressure is high, the sensor assembly cannot always perform normal detection; the method for measuring the minimum gas flow based on the static expansion method vacuum standard is characterized in that gas in a calibration chamber is introduced into a vacuum system through a small hole, and the gas flow is obtained according to the conductance of the small hole and the pressure in a gas pressure attenuation system, and the method is not suitable for measuring the gas flow under the higher pressure of an indoor experiment; for the measurement of the pressurized gas flow, a gas volume flow measuring device is provided, the differential pressure between the gas pressure and the initial pressure is measured through a microprocessor, so that a corresponding control signal is generated to drive an injection pump to pump at a corresponding speed, the gas flow is measured, and when the flow is very small, the differential pressure signal detected by the microprocessor is small, so that the precision requirement on the injection pump is very high; the high-pressure gas flow metering standard device adopts a weighing method to measure the micro gas flow, the gas mass change is very small in a period of time, and the mass difference before and after measurement is difficult; the ultrasonic gas flow rate measuring method measures the transit time between the transmission of an ultrasonic pulse signal from a transmitting sensor and the reception of the ultrasonic pulse signal from the receiving sensor, but the transit time difference of the ultrasonic pulse signal in the gas may be difficult to distinguish among minute flow rates, and particularly, the minute flow rate of the gas may not be easily detected.
Therefore, it is necessary to develop a gas micro-flow measuring device and method under reservoir conditions for experiments, which can directly measure the flow velocity of trace gas with high pressure.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a gas micro-flow measuring device and method under reservoir conditions for experiments, which can directly measure the flow velocity of trace gas with higher pressure.
One aspect of the present invention provides a device for measuring micro-flow of gas under reservoir conditions for experiments, comprising:
a sapphire tube;
an inlet end fitting connected to one end of the sapphire tube, the inlet end fitting comprising an inlet end gas inlet and an inlet end liquid inlet;
an outlet end fitting connected to the other end of the sapphire tube, the outlet end fitting including an outlet end gas inlet;
the first injection pump is arranged at the inlet end;
the liquid intermediate container is arranged between the first injection pump and the inlet end liquid inlet;
a second injection pump disposed at the outlet end;
a gas pressure vessel disposed between the second injection pump and the outlet port gas inlet.
Preferably, the method further comprises the following steps:
the first two-way valve is arranged at the air inlet of the inlet end;
the second two-way valve is arranged between the liquid intermediate container and the liquid inlet of the inlet end;
and the third two-way valve is arranged between the gas pressure container and the gas inlet of the outlet end.
Preferably, the inner wall of the sapphire tube is provided with a scale of fluid volume.
Preferably, the first, second and third two-way valves are electrically powered two-way valves.
In another aspect, the present invention provides a method for measuring micro-flow of gas under reservoir conditions for experiments, comprising the following steps:
step 1, filling gas in a gas pressure container, and controlling the gas pressure in the gas pressure container through a second injection pump;
step 3, boosting the pressure of the liquid intermediate container filled with liquid through a first injection pump, opening a second two-way valve when the pressure is the same as the gas pressure in the sapphire pipe, pumping the liquid into the sapphire pipe, and closing the second two-way valve;
and 5, calculating the gas flow according to the migration distance, the migration time and the gas pressure of the water column in the sapphire pipe.
Preferably, the gas in the gas pressure vessel is an inert gas.
Preferably, the liquid of the liquid intermediate container is a liquid incapable of dissolving the inert gas.
Alternatively, the gas pressure depends on the degree of pressure resistance of the sapphire tube, and for example, the gas pressure may be 2 to 10Mpa, or a higher pressure, as long as the sapphire tube can withstand.
Alternatively, the volume of liquid pumped into the sapphire tube may be 0.05-2ml, preferably, the volume of liquid is about 0.1-1 ml.
Alternatively, the transit time is dependent on the flow rate and may range from a few seconds to several hundred seconds. The device and the method for measuring the gas micro-flow under the reservoir condition for the experiment have the advantages that: the method can directly measure the flow velocity of the gas under certain pressure by utilizing the migration of the gas-liquid interface in the pressure-resistant sapphire pipe, is simple and convenient, and has a high-precision test result.
The apparatus and methods of the present invention have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
FIG. 1 shows a schematic of a gas micro-flow measurement device for experimental reservoir conditions according to the present invention.
FIG. 2 shows a flow chart of a method of gas micro-flow determination under experimental reservoir conditions in accordance with the present invention.
Description of reference numerals:
1. a sapphire tube; 2. an inlet end fitting; 3. a first two-way valve; 4. a second two-way valve;
5. a liquid intermediate container; 6. a first injection pump; 7. a second injection pump;
8. a gas pressure vessel; 9. a third two-way valve; 10. an outlet end fitting.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In one aspect of the present invention, a device for measuring micro-flow of gas under reservoir conditions for experiments is provided, including: a sapphire tube; the inlet end connector is connected to one end of the sapphire pipe and comprises an inlet end gas inlet and an inlet end liquid inlet; the outlet end joint is connected to the other end of the sapphire pipe and comprises an outlet end air inlet; the first injection pump is arranged at the inlet end; the liquid intermediate container is arranged between the first injection pump and the inlet end liquid inlet; the second injection pump is arranged at the outlet end; and the gas pressure container is arranged between the second injection pump and the outlet end gas inlet.
Preferably, the method further comprises the following steps: the first two-way valve is arranged at the air inlet of the inlet end; the second two-way valve is arranged between the liquid intermediate container and the liquid inlet of the inlet end; and the third two-way valve is arranged between the gas pressure container and the gas inlet of the outlet end.
The two-way valve used in the present invention is an electromagnetic two-way valve or an electric two-way valve, and more preferably an electric two-way valve.
The sapphire pipe is the hyaline tube, and the transparent sapphire pipe of different internal diameters is selected according to the size of experiment flow to its internal diameter, and sapphire intraductal wall is carved with the scale of measurement volume, and the experimenter of being convenient for measures the volume through fluidic, and the pressure of exit end can be controlled to gas pressure vessel to keep the stability of pressure through the second infusion pump that links to each other.
In another aspect of the present invention, a method for measuring micro-flow of gas under reservoir conditions for experiments is provided, which comprises the following steps:
step 1, filling gas in a gas pressure container, and controlling the gas pressure in the gas pressure container through a second injection pump;
step 3, boosting the liquid intermediate container filled with liquid through the first injection pump, opening the second two-way valve when the pressure is the same as the gas pressure in the sapphire pipe, pumping the liquid into the sapphire pipe, and closing the second two-way valve;
and 5, calculating the gas flow according to the migration distance, the migration time and the gas pressure of the water column in the sapphire pipe.
Preferably, the gas in the gas pressure vessel is an inert gas.
Preferably, the liquid in the liquid intermediate container is a liquid in which an inert gas cannot be dissolved.
The gas micro-flow measuring device for the reservoir conditions for the experiment measures the gas flow, can directly measure the flow velocity of trace gas under higher pressure, and has the advantages of convenient operation, simple and convenient measuring method and higher precision of the measuring result.
Examples
FIG. 1 shows a schematic of a gas micro-flow measurement device for experimental reservoir conditions according to the present invention. FIG. 2 shows a flow chart of a method of gas micro-flow determination under experimental reservoir conditions in accordance with the present invention.
The invention relates to a device for measuring micro-flow of gas under reservoir conditions for experiments, which comprises:
a sapphire tube 1;
the inlet end connector 2 is connected to one end of the sapphire pipe 1, and the inlet end connector 2 comprises an inlet end gas inlet and an inlet end liquid inlet;
an outlet end fitting 10 connected to the other end of the sapphire tube 1, the outlet end fitting 10 including an outlet end air inlet;
the first injection pump 6, the first injection pump 6 is set up in the inlet end;
the liquid intermediate container 5 is arranged between the first injection pump 6 and the inlet end liquid inlet;
a second injection pump 7, the second injection pump 7 being disposed at the outlet end;
and the gas pressure container 8 is arranged between the second injection pump 7 and the outlet end gas inlet 8.
The device also includes:
the first two-way valve 3 is arranged at an air inlet of the inlet end;
the second two-way valve 4 is arranged between the liquid intermediate container 5 and the liquid inlet of the inlet end;
and a third two-way valve 9, wherein the third two-way valve 9 is arranged between the gas pressure vessel 8 and the outlet end gas inlet.
Wherein, sapphire pipe 1 inner wall is carved with the volume scale, and the two-way valve that this embodiment used is electronic two-way valve.
Gas flow measurement was performed according to the above apparatus:
before measurement, a gas pressure container is filled with nitrogen with the pressure of 5MPa required by an experiment, the pressure of the nitrogen in the gas pressure container is stabilized at 5MPa through a second injection pump in the whole measurement process, then a third two-way valve is opened to connect a sapphire pipe and the gas pressure container, the nitrogen with the pressure of 5MPa is filled in the sapphire pipe, a liquid insoluble in gas is filled in a liquid intermediate container, and the pressure of the liquid is increased to 5MPa through a first injection pump.
During measurement, the second two-way valve is opened, 0.1ml of liquid insoluble in gas is injected into the connector at the inlet end of the device through the first injection pump, and then the second two-way valve is closed; and opening the first two-way valve, enabling the gas to be measured to enter the device through the inlet end gas inlet to form a gas-liquid interface with the liquid, pushing the gas-liquid interface to move in the sapphire pipe along with the continuous entering of the gas to be measured at the inlet end gas inlet, observing and recording the moving amount of the gas-liquid interface in the sapphire pipe, and recording the moving amount of the gas-liquid interface in the sapphire pipe for 100s when the gas is moved by 1ml scale, so that the flow rate of the gas to be measured at 5MPa is 0.01 ml/s.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (5)
1. A gas micro-flow measuring device under reservoir conditions for experiments comprises:
a sapphire tube;
an inlet end fitting connected to one end of the sapphire tube, the inlet end fitting comprising an inlet end gas inlet and an inlet end liquid inlet;
an outlet end fitting connected to the other end of the sapphire tube, the outlet end fitting including an outlet end gas inlet;
the first injection pump is arranged at the inlet end;
the liquid intermediate container is arranged between the first injection pump and the inlet end liquid inlet;
a second injection pump disposed at the outlet end;
a gas pressure vessel disposed between the second injection pump and the outlet port gas inlet;
further comprising:
the first two-way valve is arranged at the air inlet of the inlet end;
the second two-way valve is arranged between the liquid intermediate container and the liquid inlet of the inlet end;
a third two-way valve disposed between the gas pressure vessel and the outlet port gas inlet;
the gas in the gas pressure container is inert gas;
the liquid of the liquid intermediate container is a liquid incapable of dissolving the inert gas.
2. A microfluidic device for gas under experimental reservoir conditions according to claim 1, wherein the sapphire tube inner wall is provided with a scale for measuring the volume of fluid.
3. A gas micro-flow assay device under experimental reservoir conditions as claimed in claim 1, wherein the first, second and third two-way valves are electrically powered two-way valves.
4. A method of determining the micro-flow of a gas under reservoir conditions for experiments using the device of any one of claims 1 to 3, wherein the method comprises the steps of:
step 1, filling gas in a gas pressure container, and controlling the gas pressure in the gas pressure container through a second injection pump;
step 2, opening a third two-way valve to enable the sapphire pipe to be filled with gas;
step 3, boosting the pressure of the liquid intermediate container filled with liquid through a first injection pump, opening a second two-way valve when the pressure is the same as the gas pressure in the sapphire pipe, pumping the liquid into the sapphire pipe, and closing the second two-way valve;
step 4, opening a first two-way valve, enabling gas to be measured to enter the sapphire tube, forming a water column interface with the liquid, and pushing the water column interface to move in the sapphire tube;
and 5, calculating the gas flow according to the migration distance, the migration time and the gas pressure of the water column in the sapphire pipe.
5. A method of micro-flow of gas under experimental reservoir conditions as claimed in claim 4 wherein the volume of liquid pumped into the sapphire tube is 0.05-2 ml.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710174277.XA CN108627437B (en) | 2017-03-22 | 2017-03-22 | Gas micro-flow measuring device and method under reservoir conditions for experiment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174277.XA CN108627437B (en) | 2017-03-22 | 2017-03-22 | Gas micro-flow measuring device and method under reservoir conditions for experiment |
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| Publication Number | Publication Date |
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| CN108627437A CN108627437A (en) | 2018-10-09 |
| CN108627437B true CN108627437B (en) | 2021-04-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111504406B (en) * | 2020-05-15 | 2022-03-29 | 大连理工大学 | Flow detection chip and detection method for ultramicro small-flow liquid |
| CN115077643B (en) * | 2022-07-26 | 2022-11-04 | 中国测试技术研究院流量研究所 | Device and method for detecting flow of micro-flow liquid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910951A (en) * | 2016-04-06 | 2016-08-31 | 西南石油大学 | Measuring apparatus and measuring method for gas solubility in fluid in shaft of oil and gas well |
| CN205920034U (en) * | 2016-07-20 | 2017-02-01 | 西南石油大学 | Measure gas logging device of higher permeability rock core |
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2017
- 2017-03-22 CN CN201710174277.XA patent/CN108627437B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910951A (en) * | 2016-04-06 | 2016-08-31 | 西南石油大学 | Measuring apparatus and measuring method for gas solubility in fluid in shaft of oil and gas well |
| CN205920034U (en) * | 2016-07-20 | 2017-02-01 | 西南石油大学 | Measure gas logging device of higher permeability rock core |
Non-Patent Citations (1)
| Title |
|---|
| 高压气体在微圆管中的流动特性;赵清民;《中国石油大学学报（自然科学版》;20120831;第129页-133页 * |
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