CN111198147B - Gas content analysis device - Google Patents
Gas content analysis device Download PDFInfo
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- CN111198147B CN111198147B CN202010040830.2A CN202010040830A CN111198147B CN 111198147 B CN111198147 B CN 111198147B CN 202010040830 A CN202010040830 A CN 202010040830A CN 111198147 B CN111198147 B CN 111198147B
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- 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
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
- G01N7/16—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference by heating the material
Abstract
The invention relates to a gas content analysis device, which is used for analyzing the gas content of a well site shale core, and comprises: the device comprises a control module, a rock core processing module, a gas processing module and a gas analysis module; the core processing module is connected with the control module and is used for processing the shale core; the gas treatment module is connected with the control module and is used for treating gas released by the rock core and reducing the content of water vapor in the gas; the gas analysis module is connected with the control module and is used for detecting the content ratio of methane in the gas treated by the gas treatment module. According to the invention, the shale core is processed to obtain the gas released by the shale core, the gas is processed to absorb and filter water vapor in the gas, and the processed gas is detected to obtain high-precision methane content data in the gas.
Description
Technical Field
The invention relates to the technical field of natural gas measurement, in particular to a gas content analysis device.
Background
Machine-rich shale has long been recognized as a source rock and seal for conventional petroleum systems. Commercial production of shale gas, however, changed this concept and in recent years, shale has received renewed attention as an effective reservoir. Shale gas refers to unconventional natural gas that is present in reservoir rock systems that are predominantly rich in organic matter shale. Shale gas may be produced in various stages of organic origin, existing in shale, high carbon shale, shale and silty rock type interlayers, in adsorbed or free state on the bulk. The shale gas resources in China are rich, and the development of the shale gas industry has a better resource foundation. The national soil resources department in 2015 releases the latest investigation and evaluation results, the recoverable resource amount of the shale gas technology in China is 21.8 billion cubic meters, and the shale gas is ranked in the forefront in the global rank. The natural gas is used as a relatively clean energy resource, the proportion of the natural gas in the energy structure of China is gradually increased, the gap between the production capacity and the consumption capacity of the natural gas is further widened in the future, and the shale gas industry development of China has a relatively large market space.
The gas content of the drilling core is a key parameter in shale gas exploration and development, the position of a specific high-yield gas layer is determined, and the larger the gas content of the drilling core is, the higher the development value of a corresponding reservoir layer is. At present, shale field desorption gas measurement products are large in oil field demand and mainly divided into two types of flow meter measurement and drainage measurement, but the products on the market generally have the defects of short service life, inaccurate gas measurement and the like.
Disclosure of Invention
The invention aims to provide a gas content analysis device, which is used for solving the defects that the product generally has short service life and low gas content measurement precision in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a gas content analysis device for analyzing gas content of a well site shale core, the gas content analysis device comprises: the device comprises a control module, a rock core processing module, a gas processing module and a gas analysis module;
the core processing module is connected with the control module and is used for processing the shale core;
the gas treatment module is connected with the control module and is used for treating the gas released by the rock core and reducing the content of water vapor in the gas;
the gas analysis module is connected with the control module and is used for detecting the content ratio of methane in the gas treated by the gas treatment module.
Optionally, the gas content analyzing apparatus further includes: the temperature sensor is connected with the control module, is arranged on the core processing module and is used for detecting the temperature of the core processor.
Optionally, the core processing module specifically includes: a desorption unit and a heating unit;
the desorption unit is arranged in the heating unit and used for storing the shale core;
the heating unit is connected with the control module and used for heating the desorption unit according to the control signal of the control module.
Optionally, the desorption unit is 6 desorption tanks, the heating unit is a heating box body, the desorption tanks are arranged in the heating box body, and the heating box body heats the desorption tanks according to the control signal of the control module.
Optionally, the gas treatment module specifically includes: a gas separation unit and a drying and filtering unit;
the gas separation unit is connected with the core processing module and is used for separating water vapor in the gas released by the shale core;
the drying and filtering unit is connected with the gas separation unit and is used for absorbing the water vapor.
Optionally, the gas analysis module specifically includes: the device comprises a methane gas analysis unit, a flowmeter, a gas sample storage unit and a gas content testing unit;
the methane gas analysis unit is connected with the gas processing module and is used for detecting the proportion of methane in the gas processed by the gas processing module;
the flow meter is connected with the methane gas analysis unit and is used for recording the content of gas passing through the methane gas analysis unit;
the gas sample storage unit is connected with the flowmeter and is used for storing gas;
the gas-containing test unit is connected with the gas sample storage unit and is used for detecting the volume of desorbed gas in a low-flow gas state.
Optionally, the gas content testing unit specifically includes: the automatic metering device comprises a first metering container, a second metering container, an automatic switcher, two sealed rubber pistons, two transmission screw rods, two servo motors and two pressure sensors;
one end of the first metering container is connected with one end of the automatic switcher, and the first metering container is used for storing gas;
one end of the second metering container is connected with the other end of the automatic switcher, and the second metering container is used for storing gas;
sealed rubber pistons are arranged in the first metering container and the second metering container and are used for sealing gas;
one end of each transmission screw rod is connected with one sealed rubber piston, the other end of each transmission screw rod is connected with one servo motor, and the transmission screw rods are used for adjusting the positions of the sealed rubber pistons along with the rotation of the servo motors;
and each sealing rubber piston is provided with a pressure sensor which is used for detecting gas pressure.
Optionally, the gas-containing test unit further comprises two speed reducers, each speed reducer is arranged on one servo motor and connected with the transmission screw rod, and the speed reducers are used for reducing the rotating speed of the servo motors.
Optionally, the model of the control module is STM32F 103.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, the shale core is processed to obtain the gas released by the shale core, the gas is processed to absorb and filter water vapor in the gas, and the processed gas is detected to obtain high-precision methane content data in the gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of an apparatus according to the present invention;
FIG. 2 is a left side view of a reservoir simulation system provided by the present invention;
FIG. 3 is a top view of a reservoir simulation system provided by the present invention;
FIG. 4 is a schematic view of a gas separation apparatus according to the present invention;
FIG. 5 is a block diagram of a piston-type gas entrapment testing system provided by the present invention.
Description of the symbols: the device comprises a desorption tank, a heating box body, a temperature sensor, a gas separation unit, a drying and filtering unit, a methane gas analysis unit, a methane.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a gas content analysis device which is used for improving the detection precision of the gas content of shale.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a gas content analysis apparatus for analyzing gas content of a well site shale core includes: the device comprises a control module 12, a rock core processing module, a gas processing module and a gas analysis module;
the core processing module is connected with the control module 12 and is used for processing the shale core;
the gas treatment module is connected with the control module 12, and is used for treating the gas released by the rock core and reducing the content of water vapor in the gas;
the gas analysis module is connected with the control module 12, and the gas analysis module is used for detecting the content ratio of methane in the gas treated by the gas treatment module.
In practical applications, the gas content analysis apparatus further includes: and the temperature sensor 3 is connected with the control module 12, the temperature sensor 3 is arranged on the core processing module, and the temperature sensor 3 is used for detecting the temperature of the core processor.
As shown in fig. 2 and 3, in practical application, the core processing module specifically includes: a desorption unit 15 and a heating unit 16;
the desorption unit 15 is arranged inside the heating unit 16, and the desorption unit 15 is used for storing the shale core;
the heating unit 16 is connected to the control module 12, and the heating unit 16 is configured to heat the desorption unit 15 according to a control signal of the control module 12.
In practical application, the desorption unit 15 is 6 desorption tanks 1, the heating unit 16 is a heating box body 2, the desorption tanks 1 are arranged in the heating box body 2, and the heating box body 2 heats the desorption tanks 1 according to the control signal of the control module 12.
6 desorption tanks 1 with the inner diameter of 120mm and the height of 300mm are arranged in a heating box body 2 with the external dimension of 600mm multiplied by 450mm multiplied by 500mm, and the heating box body 2 can heat the shale core up to 150 ℃ to simulate the formation temperature of the core, so that the gas in the pores of the shale core can be desorbed as much as possible.
In practical applications, the gas treatment module specifically includes: a gas separation unit 4 and a drying and filtering unit 5;
as shown in fig. 4, the gas separation unit 4 is connected to the core processing module, and the gas separation unit 4 is configured to separate water vapor from the gas released from the shale core;
the dry filter unit 5 is connected with the gas separation unit 4, and the dry filter unit 5 is used for absorbing the water vapor.
The gas separation unit 4 is used for cooling the gas by using a semiconductor refrigeration mode so as to separate water vapor in the mixed gas; the gas separation unit 4 controls the passage of desorption gas by a gas inlet 17 and a gas outlet 18; under the combined action of the grid-shaped radiating fin 19, the semiconductor element 20 and the heat absorption copper tube 21, water vapor carried in the gas is condensed on the heat absorption copper tube 21, so that the purpose of efficiently refrigerating the water vapor is achieved; the condensed water collected on the heat absorption copper pipe 21 is collected to a certain amount in the deposition water tank, and the lower part of the deposition water tank is connected with a control valve 22 to discharge the condensed water.
The drying and filtering unit 5 is organically and visually processed, a filter element 13 consisting of a filtering porous plate and allochroic silica gel is designed in the drying and filtering unit, whether the filter element 13 needs to be replaced or not can be determined by observing the color change of the drying and filtering device, impurities in gas can be filtered while water is dried, and the service life of the flowmeter 8 is prolonged; the side of the drying and filtering unit 5 is provided with a sealing bayonet window 14, so that the old filter element 13 can be replaced conveniently under the condition of ensuring that the gas passing through is not leaked.
In practical applications, the gas analysis module specifically includes: a methane gas analysis unit 6, a flowmeter 8, a gas sample storage unit 9 and a gas content test unit 11;
the methane gas analysis unit 6 is connected with the gas treatment module, and the methane gas analysis unit 6 is used for detecting the proportion of methane in the gas treated by the gas treatment module;
the flow meter 8 is connected with the methane gas analysis unit 6, and the flow meter 8 is used for recording the gas content passing through the methane gas analysis unit 6;
the gas sample storage unit 9 is connected with the flowmeter 8, and the gas sample storage unit 9 is used for storing gas;
the gas-containing property testing unit 11 is connected with the gas sample storage unit 9, and the gas-containing property testing unit 11 is used for detecting the volume of desorbed gas in a low-flow state of gas.
As shown in fig. 5, in practical application, the gas content testing unit 11 specifically includes: a first metering container 23, a second metering container 24, an automatic switcher 30, two sealed rubber pistons 25, two transmission screw rods 26, two servo motors 27 and two pressure sensors 29;
one end of the first metering container 23 is connected with one end of the automatic switch 30, and the first metering container 23 is used for storing gas;
one end of the second metering container 24 is connected with the other end of the automatic switch 30, and the second metering container 24 is used for storing gas;
the first metering container 23 and the second metering container 24 are respectively provided with a sealed rubber piston 25 inside, and the sealed rubber pistons 25 are used for sealing gas;
one end of each transmission screw rod 26 is connected with one sealed rubber piston 25, the other end of each transmission screw rod 26 is connected with one servo motor 27, and the transmission screw rods 26 are used for adjusting the position of the sealed rubber pistons 25 along with the rotation of the servo motors 27;
each of the sealed rubber pistons 25 is provided with a pressure sensor 29, and the pressure sensor 29 is used for detecting gas pressure.
In practical application, the gas inclusion test unit 11 further includes two speed reducers 28, each speed reducer 28 is disposed on one of the servo motors 27, the speed reducer 28 is connected to the transmission screw rod 26, and the speed reducer 28 is used for reducing the rotation speed of the servo motor 27.
The volume of the gas desorbed from the shale is sequentially measured by the flowmeter 8 with the measuring range of 50sccm and the gas-containing property testing unit 11 according to the instantaneous flow rate; under the monitoring of the control module 12, the second electromagnetic valve 10 is closed at the initial measurement stage, the first electromagnetic valve 7 is opened, and the initial desorption gas flows through the flowmeter 8 to calculate the desorption gas quantity; when the control module 12 monitors that the flow rate of the gas flowing through the flowmeter 8 is lower than 10sccm, the first electromagnetic valve 7 is closed, the second electromagnetic valve 10 is opened, and the gas content testing unit 11 measures the volume of the desorbed gas at low flow rate; the data generated in the whole measuring process are transmitted back to the control module 12, and the total volume of the desorbed methane gas can be displayed after conversion.
The pressure of the upper desorption gas cavity is always consistent with the external atmospheric pressure of the lower part by controlling the movement of the sealed rubber piston 25 under the detection of the pressure sensor 29, and the desorption gas quantity is recorded by the upper cavity of the sealed rubber piston 25; a servo motor 27 and a speed reducer 28 control the movement of the sealed rubber piston 25 in the metering container through a transmission screw rod 26; after the first metering container 23 is full, the automatic switching device 30 will connect the desorption gas into the second metering container 24, the first metering container 23 and the second metering container 24 can be used alternately, the volume of the desorption gas under low flow can be accurately recorded, and the data is finally transmitted back to the control module 12 for calculation and storage.
In practical application, the model of the control module 12 is STM32F 103.
In practical application, the control module 12 is a computer upper computer.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A gas content analysis device for analyzing gas content of a well site shale core is characterized by comprising: the device comprises a control module, a rock core processing module, a gas processing module and a gas analysis module;
the core processing module is connected with the control module, and the gas processing module is used for processing the shale core;
the gas treatment module is connected with the control module and is used for treating the gas released by the rock core and reducing the content of water vapor in the gas;
the gas analysis module is connected with the control module and is used for detecting the content ratio of methane in the gas treated by the gas treatment module;
the gas analysis module specifically includes: the device comprises a methane gas analysis unit, a flowmeter, a gas sample storage unit and a gas content testing unit;
the methane gas analysis unit is connected with the gas processing module and is used for detecting the proportion of methane in the gas processed by the gas processing module;
the flow meter is connected with the methane gas analysis unit and is used for recording the content of gas passing through the methane gas analysis unit;
the gas sample storage unit is connected with the flowmeter and is used for storing gas;
the gas-containing testing unit is connected with the gas sample storage unit and is used for detecting the volume of desorbed gas in a low-flow state of gas;
the gas treatment module specifically comprises: a gas separation unit and a drying and filtering unit;
the gas separation unit is connected with the core processing module and is used for separating water vapor in gas released by the shale core;
the drying and filtering unit is connected with the gas separation unit and is used for absorbing the water vapor;
the gas separation unit is used for cooling the gas in a semiconductor refrigeration mode to separate the water vapor in the mixed gas; the gas separation unit controls the passing of desorption gas through a gas inlet and a gas outlet; under the combined action of the grid-shaped radiating fins, the semiconductor element and the heat absorption copper pipe, the water vapor carried in the gas is condensed on the heat absorption copper pipe, so that the aim of efficiently refrigerating the water vapor is fulfilled; the condensed water collected on the heat absorption copper pipe is collected in a certain amount in a deposition water tank, and the lower part of the deposition water tank is connected with a control valve to discharge the condensed water;
the drying and filtering unit is organically and visually processed, a filter element consisting of a filtering porous plate and allochroic silica gel is designed in the drying and filtering unit, whether the filter element needs to be replaced or not is determined by observing the color change of the drying and filtering device, impurities in the gas can be filtered while the water is dried, and the service life of the flowmeter is prolonged; the side face of the drying and filtering unit is provided with a sealing bayonet window, so that the old filter element can be conveniently replaced under the condition that gas is not leaked.
2. The gas content analysis device according to claim 1, further comprising: the temperature sensor is connected with the control module, is arranged on the core processing module and is used for detecting the temperature of the core processor.
3. The gas content analysis device according to claim 1, wherein the core processing module specifically comprises: a desorption unit and a heating unit;
the desorption unit is arranged in the heating unit and used for storing the shale core;
the heating unit is connected with the control module and used for heating the desorption unit according to the control signal of the control module.
4. The gas content analysis device according to claim 3, wherein the desorption unit is 6 desorption tanks, the heating unit is a heating box body, the desorption tanks are arranged in the heating box body, and the heating box body heats the desorption tanks according to the control signal of the control module.
5. The gas content analysis device according to claim 1, wherein the gas content test unit specifically comprises: the automatic metering device comprises a first metering container, a second metering container, an automatic switcher, two sealed rubber pistons, two transmission screw rods, two servo motors and two pressure sensors;
one end of the first metering container is connected with one end of the automatic switcher, and the first metering container is used for storing gas;
one end of the second metering container is connected with the other end of the automatic switcher, and the second metering container is used for storing gas;
sealed rubber pistons are arranged in the first metering container and the second metering container and are used for sealing gas;
one end of each transmission screw rod is connected with one sealed rubber piston, the other end of each transmission screw rod is connected with one servo motor, and the transmission screw rods are used for adjusting the positions of the sealed rubber pistons along with the rotation of the servo motors;
each of the sealed rubber pistons is provided with one of the pressure sensors for detecting gas pressure.
6. The gas content analysis device according to claim 5, wherein the gas content test unit further comprises two speed reducers, each speed reducer is arranged on one servo motor, the speed reducers are connected with the transmission screw rods, and the speed reducers are used for reducing the rotating speed of the servo motors.
7. The gas content analysis device according to claim 1, wherein the control module is of the model STM32F 103.
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| CN114577666A (en) * | 2021-01-25 | 2022-06-03 | 中国石油天然气股份有限公司 | Shale gas pressure maintaining, coring, pressure reducing, analyzing and metering device and shale gas content measuring method |
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