CN111827998A - Real-time sampling device for methane detection in fracturing flow-back fluid - Google Patents
Real-time sampling device for methane detection in fracturing flow-back fluid Download PDFInfo
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- CN111827998A CN111827998A CN201910313634.5A CN201910313634A CN111827998A CN 111827998 A CN111827998 A CN 111827998A CN 201910313634 A CN201910313634 A CN 201910313634A CN 111827998 A CN111827998 A CN 111827998A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 162
- 239000012530 fluid Substances 0.000 title claims abstract description 76
- 238000005070 sampling Methods 0.000 title claims abstract description 73
- 238000001514 detection method Methods 0.000 title claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 91
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 238000011897 real-time detection Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 44
- 238000001035 drying Methods 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 18
- 230000005484 gravity Effects 0.000 claims description 5
- 239000002356 single layer Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 78
- 238000011161 development Methods 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000003345 natural gas Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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Abstract
The invention provides a real-time sampling device for methane detection in a fracturing flow-back fluid. The device includes: a real-time sampling device of methane detection in fracturing flowback fluid, wherein, the device includes: a tank body and a steady flow channel; the upper part of the tank body is provided with a gas outlet, the middle part is provided with a liquid inlet, and the lower part is provided with a liquid outlet; the steady flow channel is a tubular channel with the cross section continuously reduced from the inlet to the outlet and is arranged in the tank body, wherein the upper wall of the steady flow channel close to the inlet is provided with a gas discharge port, the inlet is connected with the liquid inlet by abutting against the inner wall of the tank body, and the end face of the outlet is provided with a porous material. The sampling device is simple in structure, can realize quick sampling of real-time detection of methane in fracturing flowback fluid, and is beneficial to realizing real-time and continuous measurement of the loss of the methane.
Description
Technical Field
The invention belongs to the technical field of methane loss and leakage detection in the shale gas development process, and relates to a real-time sampling device for methane detection in fracturing flowback fluid.
Background
The development of unconventional oil gas, particularly shale gas, is an important strategic plan for dealing with the problem of energy shortage. According to the estimation of the United states energy agency, in the recoverable reserves of shale gas of 32 countries all over the world, the recoverable reserves of the shale gas in China reach 36 trillion cubic meters, the shale gas occupies the first place in the world, and meanwhile, the recoverable reserves also far exceed the conventional natural gas reserves of 3.0 trillion cubic meters in China. In China, the resource importance of the shale gas is becoming remarkable. In 2017, the yield of unconventional oil and gas resources in China accounts for 35.86% of the national natural gas yield, wherein the shale gas yield reaches 89.95 billion cubic meters. In the distant view planning of fossil energy development in China, the natural gas yield in China reaches 2500 billions of cubic meters in 2030, wherein unconventional oil gas occupies half-wall Jiangshan.
In the development and utilization process of unconventional energy such as shale gas, the dissipation and emission of methane gas in the production process are widely concerned in the international range, researches show that the dissipation and emission of methane gas in the development process of American shale gas accounts for 2.3% of the yield of natural gas, and the greenhouse effect caused by methane emission in the development process of unconventional energy such as shale gas is questioned whether the unconventional energy such as shale gas also has the clean property of natural gas. Therefore, the method is of great importance for detecting the escape of methane in the shale gas development process.
In the shale gas development process, a large amount of fracturing flow-back fluid is generated in the evaluation stage of the shale gas production well (the production well at the stage is also called as an evaluation well), and part of methane gas is carried in the process of discharging the fracturing flow-back fluid, so that methane is dissipated and leaked. The methane dissipation and emission in the evaluation phase of the shale gas production well is an extremely important methane dissipation and leakage control object in the shale gas development process, and the quantification of the methane dissipation and emission in the process is particularly important.
At present, the development of shale gas in China is still in the period of hardness attack and rising, no clear detection method is provided for evaluating methane escape and leakage caused by discharge of well fracturing flowback fluid, no specific standard and regulation are provided for a methane detection real-time sampling device in the process, and no method introduction is provided for related patents and documents. Meanwhile, the shale gas development process evaluates that the well fracturing flowback fluid is a continuous liquid stream when being discharged, but the shale gas development process presents the characteristic of irregular instantaneous flow surge, and brings certain difficulty to methane detection work in the well fracturing flowback fluid evaluation in the shale gas development process.
Therefore, the development of a real-time sampling device suitable for methane detection in the shale gas development process evaluation well fracturing flowback fluid is urgently needed in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a real-time sampling device for methane detection in a fracturing flow-back fluid. The device can be applicable to the sampling of methane gas real-time detection in the fracturing flow-back fluid of evaluation well exhaust in shale gas development process.
In order to achieve the above object, the present invention provides a real-time sampling device for methane detection in a fracturing flow-back fluid, wherein the device comprises: a tank body and a steady flow channel;
the upper part of the tank body is provided with a gas outlet, the middle part is provided with a liquid inlet, and the lower part is provided with a liquid outlet;
the steady flow channel is a tubular channel with the cross section continuously reduced from the inlet to the outlet and is arranged in the tank body, wherein the upper wall of the steady flow channel close to the inlet is provided with a gas discharge port, the inlet is connected with the liquid inlet by abutting against the inner wall of the tank body, and the end face of the outlet is provided with a porous material.
In the real-time sampling device, preferably, the ratio of the cross-sectional area of the outlet to the inlet of the flow stabilizing channel is 1:4-1: 6; more preferably, the ratio of the cross-sectional area of the outlet to the inlet of the flow stabilizing channel is 1: 5; the control of the cross-sectional areas of the outlet and the inlet of the flow stabilizing channel is beneficial to further improving the performance of the flow stabilizing channel.
In the above real-time sampling device, preferably, the lower wall surface of the inner wall of the flow stabilizing channel is kept horizontal.
In the above real-time sampling device, preferably, a lowest point of an inner wall of the inlet of the steady flow channel and a lowest point of the liquid inlet of the tank body are at the same height.
In the above real-time sampling device, preferably, a liquid inlet channel connected to the liquid inlet is provided outside the tank, the lowest point of the inner wall of the inlet of the steady flow channel and the lowest point of the liquid inlet of the tank are at the same height, and the lower wall surface of the inner wall of the steady flow channel is parallel to the lower wall surface of the inner wall of the liquid inlet channel; more preferably, the lower wall surface of the inner wall of the flow stabilizing channel and the lower wall surface of the inner wall of the liquid inlet channel are kept horizontal. At this moment, the fracturing flow-back fluid can stably enter the flow stabilizing channel.
In the above real-time sampling device, preferably, the device further includes a liquid flow meter, and the liquid flow meter is connected to the liquid outlet of the tank. And a liquid flow meter is arranged to detect the discharge rate of the fracturing flow-back fluid.
In the above real-time sampling device, preferably, the device further comprises a liquid level control device, and the liquid level control device is connected to the liquid outlet of the tank body to control the liquid level in the tank body. Keeping the liquid level constant can make the methane sampling space of the present invention constant.
In the above real-time sampling device, when the device includes both a liquid flow meter and a liquid level control device, the liquid outlet of the tank body may be connected to the liquid level control device and then to the liquid flow meter, or the liquid outlet of the tank body may be connected to the liquid flow meter and then to the liquid level control device.
In the above real-time sampling device, preferably, the device further comprises a gas drying device, and the gas drying device is connected to the gas outlet of the tank. The drying device helps to avoid inaccurate detection results and equipment damage of the detection device caused by water vapor when the acquired gas sample is detected.
In the above real-time sampling device, preferably, the porous material is a single-layer filter mesh structure; more preferably, the pore size of the single-layer filtering net structure is 3-5 mm. Wherein, the material of the porous material is selected according to actual needs.
In the real-time sampling device, the shape of the tank may be, but is not limited to, a cylinder, a rectangular parallelepiped, a cube, or a polyhedron.
The cross-sectional shape of the inner diameter of the flow stabilizing channel in the real-time sampling device can be, but is not limited to, semicircular, circular or square.
When the sampling equipment is used for fracturing backflow liquid methane detection and real-time sampling, the liquid inlet can be directly connected with a wellhead fracturing backflow liquid pipeline.
The invention does not limit the material for manufacturing the methane detection real-time sampling device, the structural size and the like in any form, and the skilled person can select the material according to the actual situation. For example, in the specific embodiment, the tank of the sampling device is designed to be cylindrical, the height is designed to be 0.5m, the radius is 0.4m, the height from the flow stabilizing channel to the liquid outlet is 0.15m, and the used material is stainless steel.
The invention also provides a real-time detection device for methane in the fracturing flow-back fluid, wherein the device comprises: the real-time methane detection sampling device and the methane detection instrument are arranged in the fracturing flow-back fluid;
when the real-time sampling device comprises a drying device connected with the gas outlet, the methane detection instrument is connected with the outlet of the drying device;
when the real-time sampling device does not comprise a drying device connected with the gas outlet, the methane detection instrument is connected with the gas outlet of the real-time sampling device.
The invention also provides a real-time sampling method for detecting methane in the fracturing flow-back fluid by using the real-time sampling device for detecting methane in the fracturing flow-back fluid, which comprises the following steps:
1) the fracturing flow-back fluid enters an inlet of the steady flow channel from a fluid inlet of the sampling device, flows through the steady flow channel and flows out from an outlet of the steady flow channel; in the process of flowing through the steady flow channel, a first part of gas separated from the fracturing flow-back liquid entering the steady flow channel is discharged from a gas discharge port of the steady flow channel and is collected to the upper part of the tank body, a second part of gas is further separated from the fracturing flow-back liquid when the fracturing flow-back liquid flows through a porous material at the outlet of the steady flow channel, and the second part of gas is collected to the upper part of the tank body;
2) the fracturing flow-back fluid flowing out of the outlet of the steady flow channel is converged to the lower part of the tank body in the tank body under the action of gravity, a third part of gas is further separated in the process that the fracturing flow-back fluid is converged to the lower part of the tank body, and the separated third part of gas is converged to the upper part of the tank body; the first part, the second part and the third part of the gas collected to the upper part of the tank body are samples to be collected.
In the above sampling method, preferably, the liquid level in the lower portion of the tank is kept constant.
In the above sampling method, preferably, the sampled specimen is further subjected to a drying process.
In the sampling method, the fracturing flow-back fluid is preferably kept to enter the steady flow channel smoothly.
The invention also provides a method for detecting methane in the fracturing flow-back fluid in real time by using the device for detecting methane in the fracturing flow-back fluid in real time, wherein the method comprises the following steps:
1) the fracturing flow-back fluid enters an inlet of the steady flow channel from a fluid inlet of the sampling device, flows through the steady flow channel and flows out from an outlet of the steady flow channel; in the process of flowing through the steady flow channel, a first part of gas separated from the fracturing flow-back liquid entering the steady flow channel is discharged from a gas discharge port of the steady flow channel and is collected to the upper part of the tank body, a second part of gas is further separated from the fracturing flow-back liquid when the fracturing flow-back liquid flows through a porous material at the outlet of the steady flow channel, and the second part of gas is collected to the upper part of the tank body;
2) the fracturing flow-back fluid flowing out of the outlet of the steady flow channel is converged to the lower part of the tank body in the tank body under the action of gravity, a third part of gas is further separated in the process that the fracturing flow-back fluid is converged to the lower part of the tank body, and the separated third part of gas is converged to the upper part of the tank body;
3) and the gas collected to the upper part of the tank body enters a methane detection instrument from a gas outlet of the tank body to perform real-time detection on methane.
In the above real-time detection method, preferably, during the real-time detection of methane by using a methane detection instrument, the liquid level in the tank of the sampling device is stable; more preferably, the liquid level in the tank is at a level slightly higher than the liquid outlet. In order to further improve the accuracy of testing the methane concentration, the methane detection is carried out when the liquid level in the tank body of the methane detection real-time sampling device in the shale gas development process evaluation well fracturing flowback liquid is slightly higher than the gas outlet and is kept stable.
In the above real-time detection method, it is preferable that the gas collected to the upper part of the tank is dried before entering the methane detection instrument from the gas outlet of the tank for real-time detection of methane.
The fracturing flow-back fluid comprises all liquid and gas discharged after fracturing, and particularly comprises a gas-water mixture and carried gas.
Before the fracturing flow-back fluid is discharged, the pressure of an inlet and discharge pipeline is usually as high as 8-10MPa, and most dissolved gas can be released due to temperature and pressure difference after the fracturing flow-back fluid enters the discharge pipeline.
1. The technical scheme provided by the invention adopts the design of reducing the cross section, which is favorable for realizing the collection and the steady flow of the fracturing flow-back fluid as unstable water flow on one hand and avoiding the impact of the sudden increase of the instantaneous liquid flow; on the other hand, the outlet is used for draining water with a smaller aperture, the release of instantaneous pressure is beneficial to the release of gas from water, according to the Venturi principle, when the fracturing flow-back fluid passes through the flow cross section surface which is reduced when the flow-back fluid flows through the outlet of the steady flow channel with the porous material, the phenomenon that the flow speed of the gas-water mixture of the fracturing flow-back fluid is increased and the fluid pressure is reduced occurs, and the gas-water separation is realized along with the release of the fluid pressure.
2. The technical scheme provided by the invention is convenient to operate, realizes quick sampling and quick detection, and realizes real-time and continuous measurement of the loss of methane.
3. The technical scheme provided by the invention can be suitable for evaluating the real-time detection of methane in the fracturing flow-back fluid of the well in the shale gas development process.
4. The real-time sampling device for methane detection in the fracturing flow-back fluid provided by the invention realizes rapid separation of water and gas in a limited space.
5. The real-time sampling device for methane detection in the fracturing flow-back fluid provided by the invention is simple in structure, excellent in performance and good in industrial popularization value.
Drawings
Fig. 1 is a diagram of a real-time sampling device for methane detection in a fracturing flow-back fluid provided in example 1.
Fig. 2 is a schematic cross-sectional view of a steady flow channel of a real-time methane detection sampling device in a fracturing flow-back fluid provided in example 1.
Fig. 3 is a schematic cross-sectional view of an outlet of a steady flow channel of a real-time methane sampling device in a fracturing flow-back fluid provided in example 1.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
In the examples, each raw reagent material is commercially available, and the experimental method not specifying the specific conditions is a conventional method and a conventional condition well known in the art, or a condition recommended by an instrument manufacturer.
Example 1
The embodiment provides a real-time sampling device of methane detection in flowing back is returned to fracturing.
As shown in figure 1, the device comprises a tank body 1, a flow stabilizing channel 5, a drying device 8, a liquid level control device 9 and a liquid flow meter 10.
Wherein, the tank body 1 is cylindrical (the height of the tank body 1 is 0.5m, the radius is 0.4m, the material is stainless steel), and the bottom and the top of the tank body 1 are horizontal; a gas sampling channel 2 connected with a gas outlet of the tank body 1 is arranged outside the upper part of the side wall of the tank body 1, and a liquid inlet channel 3 connected with a liquid inlet is arranged outside the middle part of the side wall; a fracturing flow-back fluid discharge channel 4 connected with a liquid outlet is arranged outside the lower part of the tank body 1;
the steady flow channel 5 is a tubular channel with a cross section continuously reduced from an inlet to an outlet (the area ratio of the cross section of the outlet to the cross section of the inlet of the steady flow channel 5 is 1:5), the cross section of the steady flow channel is semicircular (as shown in figure 2), the steady flow channel 5 is arranged in the tank body 1 (the height from the lowest point of the inner wall of the steady flow channel to the liquid outlet is 0.15m), the upper wall of the steady flow channel 5 close to the inlet is provided with a gas discharge port 7, the inlet of the steady flow channel 5 is tightly close to the inner wall of the tank body 1 and is connected with the liquid inlet channel 3, the end surface of the outlet (as shown in figure 3) is provided with a porous material 6, the lower wall surface of the inner;
the inlet of the drying device 8 is connected with the gas sampling channel 2; for drying the sampled gas;
the liquid level control device 9 is connected with the fracturing flow-back liquid discharge channel 4; used for controlling the liquid level in the tank body 1;
and the liquid flow meter 10 is connected with the fracturing flow-back fluid discharge channel 4 and is used for metering the liquid flow of the fracturing flow-back fluid.
This embodiment still provides a methane real-time detection device in flowing back is returned to fracturing, and the device includes the real-time sampling device that this embodiment provided and the methane detecting instrument who links to each other with the device, methane detecting instrument links to each other with drying device 8's export.
The embodiment also provides a method for detecting methane in a fracturing flow-back fluid in real time by using the device for detecting methane in a fracturing flow-back fluid in real time provided by the embodiment, wherein the method specifically comprises the following steps:
1) connecting an evaluation well fracturing flow-back fluid discharge pipeline 11 with the sampling device water inlet channel 3 so as to enable all discharged fracturing flow-back fluid to enter the sampling device;
2) the fracturing flow-back fluid enters an inlet of a flow stabilizing channel 5 from a liquid inlet channel 3 of the sampling device, flows through the flow stabilizing channel 5 and flows out from an outlet of the flow stabilizing channel 5; in the process of flowing through the steady flow channel 5, a first part of gas separated from the fracturing flow-back fluid entering the steady flow channel 5 is discharged from a gas discharge port of the steady flow channel 5 and collected to the upper part of the tank body 1, a second part of gas is further separated from the fracturing flow-back fluid when the fracturing flow-back fluid flows through the porous material 6 at the outlet of the steady flow channel 5, and the second part of gas is collected to the upper part of the tank body 1;
3) the fracturing flow-back fluid flowing out of the outlet of the flow stabilizing channel 5 is converged to the lower part of the tank body 1 in the tank body 1 under the action of gravity, a third part of gas is further separated from the fracturing flow-back fluid in the process of converging to the lower part of the tank body 1, the separated third part of gas is converged to the upper part of the tank body 1, the fracturing flow-back fluid after gas separation is gathered at the bottom of the tank body, and then is discharged through a fracturing flow-back fluid discharge channel 4;
4) the gas collected to the upper part of the tank body 1 enters a drying device 8 for drying through a gas sampling channel 2;
5) after the liquid level in the tank body 1 of the sampling device is stabilized to be slightly higher than the liquid level close to the fracturing flow-back fluid discharge channel 4, a methane detection instrument is utilized to perform real-time detection on methane (in the process of performing real-time detection on methane by using the methane detection instrument, the liquid level in the tank body 1 is stabilized at the same height all the time, and the relative constancy of a gas sampling space is ensured).
Claims (10)
1. A real-time sampling device of methane detection in fracturing flowback fluid, wherein, the device includes: a tank body and a steady flow channel;
the upper part of the tank body is provided with a gas outlet, the middle part is provided with a liquid inlet, and the lower part is provided with a liquid outlet;
the steady flow channel is a tubular channel with the cross section continuously reduced from the inlet to the outlet and is arranged in the tank body, wherein the upper wall of the steady flow channel close to the inlet is provided with a gas discharge port, the inlet is connected with the liquid inlet by abutting against the inner wall of the tank body, and the end face of the outlet is provided with a porous material; preferably, the ratio of the cross-sectional area of the outlet to the inlet of the flow stabilizing channel is from 1:4 to 1: 6; more preferably, the ratio of the cross-sectional area of the outlet to the inlet of the flow stabilizing channel is 1: 5.
2. The real-time sampling device of claim 1, wherein the inner wall lower wall of the flow stabilizing channel is kept horizontal.
3. The real-time sampling device of claim 1 or 2, wherein the lowest point of the inner wall of the inlet of the steady flow channel is at the same height as the lowest point of the liquid inlet of the tank body.
4. The real-time sampling device of claim 1, wherein a liquid inlet channel connected with the liquid inlet is arranged outside the tank body, the lowest point of the inner wall of the inlet of the steady flow channel is as high as the lowest point of the liquid inlet of the tank body, and the lower wall surface of the inner wall of the steady flow channel is parallel to the lower wall surface of the inner wall of the liquid inlet channel; preferably, the lower wall surface of the inner wall of the flow stabilizing channel and the lower wall surface of the inner wall of the liquid inlet channel are both kept horizontal.
5. The real-time sampling apparatus of claim 1,
the device also comprises a liquid flow meter, wherein the liquid flow meter is connected with the liquid outlet of the tank body;
the device also comprises a liquid level control device, wherein the liquid level control device is connected with the liquid outlet of the tank body and used for controlling the liquid level in the tank body.
6. The real-time sampling device of claim 1, wherein the porous material is a single layer filtering mesh structure; preferably, the pore size of the single-layer filtering net structure is 3-5 mm.
7. The real-time sampling device of claim 1, further comprising a gas drying device coupled to the gas outlet of the canister.
8. A real-time methane detection device in fracturing flowback fluid, wherein, the device includes: the real-time sampling device, the methane detection instrument, of any of claims 1-7;
when the real-time sampling device comprises a drying device connected with a gas outlet, the methane detection instrument is connected with the outlet of the drying device;
when the real-time sampling device does not comprise a drying device connected with a gas outlet, the methane detection instrument is connected with the gas outlet of the real-time sampling device.
9. A real-time sampling method for methane detection in a frac flowback fluid using the real-time sampling apparatus of any one of claims 1 to 7:
1) the fracturing flow-back fluid enters an inlet of the steady flow channel from a fluid inlet of the sampling device, flows through the steady flow channel and flows out from an outlet of the steady flow channel; in the process of flowing through the steady flow channel, a first part of gas separated from the fracturing flow-back liquid entering the steady flow channel is discharged from a gas discharge port of the steady flow channel and is collected to the upper part of the tank body, a second part of gas is further separated from the fracturing flow-back liquid when the fracturing flow-back liquid flows through a porous material at the outlet of the steady flow channel, and the second part of gas is collected to the upper part of the tank body;
2) the fracturing flow-back fluid flowing out of the outlet of the steady flow channel is converged to the lower part of the tank body in the tank body under the action of gravity, a third part of gas is further separated in the process that the fracturing flow-back fluid is converged to the lower part of the tank body, and the separated third part of gas is converged to the upper part of the tank body; the first part, the second part and the third part of the gas collected to the upper part of the tank body are samples to be collected;
preferably, the liquid level in the lower part of the tank is kept constant;
preferably, the collected sample is further subjected to a drying process.
10. A method for real-time detection of methane in a frac flowback fluid using the real-time methane detection apparatus of claim 8, wherein the method comprises:
1) the fracturing flow-back fluid enters an inlet of the steady flow channel from a fluid inlet of the sampling device, flows through the steady flow channel and flows out from an outlet of the steady flow channel; in the process of flowing through the steady flow channel, a first part of gas separated from the fracturing flow-back liquid entering the steady flow channel is discharged from a gas discharge port of the steady flow channel and is collected to the upper part of the tank body, a second part of gas is further separated from the fracturing flow-back liquid when the fracturing flow-back liquid flows through a porous material at the outlet of the steady flow channel, and the second part of gas is collected to the upper part of the tank body;
2) the fracturing flow-back fluid flowing out of the outlet of the steady flow channel is converged to the lower part of the tank body in the tank body under the action of gravity, a third part of gas is further separated in the process that the fracturing flow-back fluid is converged to the lower part of the tank body, and the separated third part of gas is converged to the upper part of the tank body;
3) the gas collected to the upper part of the tank body enters a methane detection instrument from a gas outlet of the tank body for real-time detection of methane, and the fracturing flow-back fluid collected to the lower part of the tank body is discharged through a liquid outlet;
preferably, in the process of carrying out real-time detection on methane by using a methane detection instrument, the liquid level in the tank body of the sampling device is stable; more preferably, the liquid level in the tank is at a level slightly higher than the liquid outlet;
preferably, the gas collected to the upper part of the tank body enters a methane detection instrument from a gas outlet of the tank body and is dried before being detected in real time by the methane detection instrument.
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| CN112523745A (en) * | 2020-12-02 | 2021-03-19 | 中国地质大学（北京） | Low-yield shale gas reservoir production seeking device and method |
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