CN112304709B - U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing - Google Patents
U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing Download PDFInfo
- Publication number
- CN112304709B CN112304709B CN202011143853.2A CN202011143853A CN112304709B CN 112304709 B CN112304709 B CN 112304709B CN 202011143853 A CN202011143853 A CN 202011143853A CN 112304709 B CN112304709 B CN 112304709B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- situ
- bragg grating
- sampling
- fiber bragg
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/16—Devices for withdrawing samples in the liquid or fluent state with provision for intake at several levels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a U-shaped tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing, wherein an in-situ sampling device comprises: the device comprises a U-shaped pipe, a driver, a sampling cavity, an intermediate flow storage container, an in-situ liquid heat and pressure preservation container, a liquid-phase one-way valve and a filter; the real-time online temperature and pressure monitoring device comprises an in-situ water storage cavity, an optical fiber fixing rod arranged in the in-situ water storage cavity, an optical fiber Bragg grating pressure sensor and a temperature sensor fixed on the optical fiber fixing rod, an optical fiber traction screw, an optical fiber clamp, an optical fiber protection pad, a signal transmission optical cable, a demodulator connected with the signal transmission optical cable and an upper computer. The invention can realize in-situ sampling and real-time online monitoring of related parameters such as fluid pressure, temperature, water level and the like in formations with different depths, is suitable for various severe acid-base environments, is convenient to install, complete in function, good in durability and stable in system, can realize long-time online monitoring of temperature and pressure, and can realize the effect of sampling at will.
Description
Technical Field
The invention relates to the technical field of groundwater environment assessment and water resource circulation in energy and waste disposal, in particular to a U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing.
Background
With the vigorous development of projects such as geological storage and utilization of carbon dioxide, landfill and treatment of municipal waste and the like, the real-time monitoring and timely sampling of underground fluid have important significance on the safe construction and environmental safety assessment of the projects. In addition, the method has important significance in nuclear waste disposal, oil exploitation, occurrence and evolution evaluation of underground fluid resources, underground water pollution evaluation, pollution source tracking and microbial community analysis of engineering areas such as dams, factories and oil extraction areas, long-term monitoring and maintenance of regional engineering or quality monitoring stations such as agriculture, forestry and geological survey, and the like.
For a complex and important underground water environment, the whole process dynamic monitoring of the temperature, the pressure and the water level of underground water is required in underground engineering construction. Pressure, temperature and water level are three main basic parameters for evaluating the risk of groundwater dryness and the path change of a water channel. And then is an important index for evaluating the influence of underground engineering construction on the water environment. However, the traditional electronic pressure and temperature sensor cannot meet the field test requirements, cannot adapt to a complex and severe underground water environment, and is not acid-resistant, high-temperature-resistant, corrosion-resistant and poor in durability and the like. Therefore, in order to improve the safety and reliability of underground engineering construction, it is necessary to apply the fiber grating temperature sensor and the fiber grating pressure sensor which have high precision, acid resistance, corrosion resistance and high temperature resistance to the monitoring of the water environment.
The application of fiber grating sensing in field engineering is a monitoring technology which is widely concerned in energy development and underground resource exploitation engineering at home and abroad in recent years. The currently widely used optical fiber sensing technology is fully distributed optical fiber sensing, in which an optical fiber is both a sensing element and a signal transmission element. The optical fiber may be deployed into the fiber optic borehole by wireline, coiled tubing, tractor, or pumped during monitoring. Another quasi-distributed optical fiber sensing technology is widely used in laboratory research. Compared with full-distributed optical fiber sensing, the optical fiber Bragg grating sensing has the advantages of higher sensitivity, more economical optical fiber demodulation instrument and the like. However, the field application of the fiber bragg grating sensing technology is limited by the fact that the fiber bragg grating is easy to break, the packaging technology is difficult and the like. Therefore, how to technically solve the problem that the fiber Bragg grating sensor is easy to break and break in field application is a problem which needs to be solved urgently when the high-precision fiber Bragg grating sensor is applied to field engineering at present.
Disclosure of Invention
Based on the defects in the prior art, the technical problem to be solved by the invention is to provide a U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing, and solve the problems that the existing U-shaped pipe is difficult to sample in multiple layers and cannot meet the requirement of monitoring the underground water temperature, pressure and water level change in real time in the whole process.
In order to achieve the purpose, the invention adopts the following technical measures:
a U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing comprises an in-situ sampling device and a real-time online temperature and pressure monitoring device matched with the in-situ sampling device; the in-situ sampling device comprises: the device comprises a U-shaped pipe, a driver, a sampling cavity, an intermediate flow storage container, an in-situ liquid heat and pressure preservation container, a liquid-phase one-way valve and a filter, wherein the U-shaped pipe is divided into a multilayer sampling cavity by a spiral simple separator, the filter is positioned in the corresponding sampling cavity, and the upper end of the filter is sequentially provided with a ball valve and the liquid-phase one-way valve; an intermediate flow storage container connected with the filter is arranged in the sampling cavity, and the in-situ liquid heat-preservation and pressure-maintaining container is connected with the intermediate flow storage container through a pipeline; the real-time online temperature and pressure monitoring device comprises an in-situ water storage cavity, an optical fiber fixing rod arranged in the in-situ water storage cavity, an optical fiber Bragg grating pressure sensor fixed on the optical fiber fixing rod, an optical fiber Bragg grating temperature sensor fixed on the optical fiber fixing rod, an optical fiber traction screw, an optical fiber hoop, an optical fiber protection pad, a signal transmission optical cable connected with the optical fiber Bragg grating temperature and pressure sensor, an optical fiber Bragg grating demodulator connected with the signal transmission optical cable, and an upper computer matched with the optical fiber Bragg grating demodulator.
Preferably, the packing system comprises a plurality of packing components, and the packing components are positioned at the upper end part and the lower end part of the sampling section of the underground sampling system and used for blocking hydraulic connection among the sampling sections.
Furthermore, the invention also comprises a water level height monitoring subsystem, wherein the water level height monitoring subsystem comprises a packaged fiber Bragg grating temperature sensor and a packaged fiber Bragg grating pressure sensor which are arranged at set positions, and the packaged fiber Bragg grating temperature sensor and the packaged fiber Bragg grating pressure sensor are connected with a fiber Bragg grating demodulator through optical cables.
Optionally, a lateral sampling hole is arranged in the in-situ water storage cavity of each independent compartment, and the lateral sampling hole is filled with quartz sand.
Furthermore, the invention also comprises a fiber Bragg grating temperature and pressure sensor protection subsystem, wherein the fiber Bragg grating temperature and pressure sensor protection subsystem comprises a fiber buffer cylinder for buffering the impact effect brought by the fluid flowing in from the sample inlet hole, and the fiber buffer cylinder is arranged at the periphery of the fiber Bragg grating temperature sensor and the fiber Bragg grating pressure sensor.
Optionally, the optical fiber fixing rod is a high-strength PVC rod, and plays a role in supporting and fixing an optical fiber, and the optical fiber bragg grating pressure sensor and the optical fiber bragg grating temperature sensor are arranged in parallel in the vertical direction.
Furthermore, the invention also comprises an optical fiber leading-out subsystem, wherein the optical fiber leading-out subsystem comprises a connecting pipe for leading out the optical fiber, a screw hole for placing the optical fiber connecting pipe, a sealing nut and a clamping sleeve for sealing the connecting part.
Compared with the prior art, the U-shaped tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing has the following beneficial effects:
the invention can realize in-situ sampling and real-time online monitoring of related parameters such as fluid pressure, temperature, water level and the like in formations with different depths, is suitable for various severe acid-base environments, is convenient to install, complete in function, good in durability and stable in system, can realize long-time online monitoring of temperature and pressure, and can realize the effect of sampling at will. The U-shaped tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing has unique design, overcomes the uncertainty of the depth of a sampling point, realizes multilayer positioning sampling, and has greatly improved working performance, wider application range, better application prospect and commercial value compared with the prior art product.
Drawings
Fig. 1 is a schematic structural diagram of a U-tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing.
FIG. 2 is a diagram of the arrangement of sensing optical fibers in the U-tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing of the present invention.
Fig. 3 is a schematic diagram of a U-tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing, namely ground pushing equipment and optical fiber demodulation equipment.
Fig. 4 is a schematic diagram of a second layer of in-situ water storage cavity of the U-shaped tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing.
Wherein: 10 a-a first layer of spiral simple separator (the PVC bar is processed and customized, the inner diameter is 150mm, 6 small holes with the diameter of 8mm are penetrated in the middle, a water supply pipeline penetrates through the PVC bar, and 3 small holes with the diameter of 10mm are penetrated through optical cables);
10 b-a second layer of spiral simple separator (the PVC bar is processed and customized, the inner diameter is 150mm, 4 small holes with the diameter of 8mm are penetrated in the middle, a water supply pipeline penetrates through the PVC bar, and 2 small holes with the diameter of 10mm are penetrated through optical cables);
10 c-a third layer of spiral simple separator (the PVC bar is processed and customized, the inner diameter is 150mm, 2 small holes with the diameter of 8mm are penetrated in the middle, a water supply pipeline penetrates through the PVC bar, and 1 small hole with the diameter of 10mm is penetrated through an optical cable);
10 d-bottom simple separator (made of PVC rod with 150mm inner diameter);
11 a-a first layer of filter screen (made of nylon and 200 meshes);
11 b-a second layer of filter screen (nylon material, 200 mesh);
11 c-third layer of filter screen (nylon material, 200 mesh).
12 a-a first in-situ water storage chamber (PVC-U tube, diameter 150mm, wall thickness 5mm, length adjusted according to the relation of depth of the stratum, here 5 m);
12 b-a second in-situ water storage chamber (PVC-U tube, diameter 150mm, wall thickness 5mm, length adjusted according to the relation of depth of the stratum, here 5 m);
12 c-a third in-situ water storage cavity (PVC-U pipe, the inner diameter is 150mm, the wall thickness is 5mm, the length is adjusted according to the depth relation of the stratum, and the depth is 5 m);
wherein: 20-real-time on-line temperature and pressure monitoring device, comprising:
a first layer of optical fiber fixing rod 20a (made of PVC material and having an outer diameter of 8 mm);
a second layer of optical fiber fixing rod 20b (made of PVC material and having an outer diameter of 8 mm);
a third layer of optical fiber fixing rod 20c (made of PVC material and having an outer diameter of 8 mm);
21 a-a first layer of optical fiber traction screws (316L stainless steel, the diameter of an external thread is 10mm, the distance between threads is 1mm, and the inner hole of the screw is 5 mm);
21 b-a second layer of optical fiber traction screws (316L stainless steel, 10mm in external thread diameter, 1mm in thread pitch and 5mm in screw inner hole);
21 c-a third layer of optical fiber traction screws (316L stainless steel, the diameter of the external thread is 10mm, the distance between the threads is 1mm, and the inner hole of the screw is 5 mm);
22 a-first in situ water storage intracavity optical fiber protection pad (viton, 3mm thick);
22 b-second in situ water storage intracavity optical fiber protection pad (fluororubber, 3mm thick);
22 c-optical fiber protection pad (fluororubber, 3mm thick) in the third in-situ water storage cavity;
23 a-fiber bragg grating pressure sensor (grating area length 10mm, grating interval 20mm) in the first in-situ water storage cavity;
23 b-fiber Bragg grating pressure sensor (grating area length 10mm, grating interval 20mm) in the first in-situ water storage cavity; 23 c-a fiber Bragg grating pressure sensor (the length of a grating area is 10mm, and the grating distance is 20mm) in the first in-situ water storage cavity;
24-fiber Bragg grating demodulator;
25 a-fiber Bragg grating temperature sensor (grating area length 10mm, grating interval 20mm) in the first in-situ water storage cavity;
25 b-fiber Bragg grating temperature sensor (grating area length 10mm, grating interval 20mm) in the first in-situ water storage cavity; 25 c-fiber Bragg grating temperature sensor (grating area length 10mm, grating interval 20mm) in the first in-situ water storage cavity;
26 a-a first in situ water storage intracavity fiber optic ferrule (304 stainless steel, 6-10mm diameter, adjustable);
26 b-a second in situ water storage intracavity fiber optic ferrule (304 stainless steel, 6-10mm diameter, adjustable);
26 c-a fiber clamp (304 stainless steel, 6-10mm diameter, adjustable) in the third in-situ water storage cavity;
27 a-first in situ water storage intracavity optical fiber buffer cylinder (nylon gauze, 2000 mesh);
27 b-a second in-situ water storage intracavity optical fiber buffer cylinder (nylon gauze, 2000 mesh);
27 c-optical fiber buffer cylinder (nylon gauze, 2000 mesh) in the third in-situ water storage cavity;
28-an upper computer matched with the fiber Bragg grating demodulator;
31 a-an intermediate storage flow container within the first in situ water storage chamber;
31 b-an intermediate storage flow container within the second in situ water storage chamber;
31 c-an intermediate storage container in the third in-situ water storage cavity;
32 a-a liquid phase one-way valve in the first in-situ water storage cavity;
32 b-a liquid phase one-way valve in the second in-situ water storage cavity;
32 c-a liquid phase one-way valve in the third in-situ water storage cavity;
33 a-ball valve of filter switch in first in-situ water storage chamber;
33 b-ball valve of filter switch in second in situ water storage chamber;
33 c-a ball valve of a filter switch in the third in-situ water storage chamber;
34 a-a first in situ water storage intracavity filter;
34 b-a second in situ water storage intracavity filter;
34 c-a third in-situ water storage intracavity filter;
ground pushing equipment and optical fiber demodulation equipment:
41-N2a high pressure gas tank;
42-an in-situ liquid heat-preservation pressure-maintaining container;
43-a ball valve is switched on and off at the front end of the in-situ liquid heat-preservation and pressure-maintaining container;
44-a tee joint;
45-N2a ball valve is switched on and off at the front end of the high-pressure gas tank;
46-a threaded screw between the sampling pipe and the packer;
47-right angle adapter.
Detailed Description
The real-time temperature and pressure monitoring and in-situ sampling system for the U-shaped tube based on optical fiber sensing of the invention is described in detail with reference to fig. 1 to 4.
The invention provides a U-shaped tube real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing, which mainly comprises an in-situ sampling device and a real-time online temperature and pressure monitoring device matched with the in-situ sampling device, wherein the in-situ sampling device comprises: u-shaped pipe, driver, sampling cavity, intermediate flow storage container, in-situ liquid heat and pressure maintaining container, liquid phase one-way valve and filter. The U-shaped pipe is divided into a plurality of layers of sampling cavities through a spiral simple separator, a lateral sampling hole is formed in each sampling cavity at each independent interval, the lateral sampling holes are filled with quartz sand, water inlet holes are formed in two ends of each sampling cavity, and the water inlet holes are plugged by filter screens with specific meshes. The driver is connected with one end of the U-shaped pipe, a ball valve is arranged in the middle, and the ground end is connected with a pressure source gas tank (N)2A high pressure gas tank). The filter is arranged in the corresponding sampling cavity, the upper end of the filter is sequentially provided with a ball valve and a liquid phase one-way valve, and the sampling cavity is internally provided with an intermediate flow storage container connected with the filter. The in-situ liquid heat-preservation and pressure-maintaining container is connected with the intermediate flow storage container through a pipeline, and a ball valve is further arranged at the front end of the in-situ liquid heat-preservation and pressure-maintaining container.
The real-time on-line temperature and pressure monitoring device 20 of the present invention comprises: the system comprises an in-situ water storage cavity, an optical fiber fixing rod arranged in the in-situ water storage cavity, an optical fiber Bragg grating pressure sensor 23 fixed on the optical fiber fixing rod, an optical fiber Bragg grating temperature sensor 25 fixed on the optical fiber fixing rod, an optical fiber traction screw 21, an optical fiber hoop 26, an optical fiber protection pad 22, an optical fiber buffer cylinder 27, a signal transmission optical cable connected with the optical fiber Bragg grating temperature and pressure sensor, an optical fiber Bragg grating demodulator 24 connected with the signal transmission optical cable, and an upper computer 28 matched with the optical fiber Bragg grating demodulator.
The in-situ sampling device and the real-time online temperature and pressure monitoring device are formed by coupling, an independent compartment is arranged at every 1m along with the height, each layer of sampling independence is separated by a one-way valve, the upper layer and the lower layer of liquid are not communicated with each other, and the independent compartment is respectively provided with a sampling room, a sample outlet room, a liquid phase one-way valve and a temperature and pressure sensing module.
The in-situ water storage cavity and the sampling cavity are the same component, so that the underground water storage cavity plays a role in storing underground water and creates conditions for optical fiber sensing.
The invention also comprises a water level height monitoring subsystem, wherein the water level height monitoring subsystem comprises a packaged fiber Bragg grating temperature sensor and a packaged fiber Bragg grating pressure sensor which are arranged at set positions, and the packaged fiber Bragg grating temperature sensor and the packaged fiber Bragg grating pressure sensor are connected with a fiber Bragg grating demodulator through optical cables.
The system also comprises a fiber Bragg grating temperature and pressure sensor protection subsystem, wherein the system comprises a fiber buffer cylinder for buffering the impact effect brought by the fluid flowing in from the sample inlet hole, and the fiber buffer cylinder is arranged at the periphery of the fiber Bragg grating temperature sensor and the fiber Bragg grating pressure sensor.
The invention also comprises an optical fiber leading-out subsystem and an in-situ liquid heat-preservation and pressure-maintaining subsystem, wherein the optical fiber leading-out subsystem comprises a connecting pipe for leading out the optical fiber, a screw hole for placing the optical fiber connecting pipe, a sealing nut and a clamping sleeve for sealing the connecting part. The in-situ liquid heat and pressure preserving subsystem comprises a high pressure resistant container, a metering pump and an incubator.
The optical fiber fixing rod is a high-strength PVC rod and plays a role in supporting and fixing optical fibers. The fiber Bragg grating pressure sensor and the fiber Bragg grating temperature sensor are arranged in parallel in the vertical direction. And an optical fiber protection pad and an optical fiber clamp are adopted at the optical fiber between the gratings for fixing and protecting the optical fiber.
The non-monitoring section optical fiber adopts an optical fiber containing a protective layer as a signal transmission element. The ground section optical fiber connection adopts a buried optical cable, and plays a role in protecting optical fiber signal transmission.
The technical solution of the present invention will be described in detail with reference to fig. 1 and the specific embodiments.
As shown in fig. 1, the real-time temperature and pressure monitoring and in-situ sampling system for U-shaped tube based on optical fiber sensing provided in this embodiment takes three layers of in-situ water storage chambers as an example, but the invention is not limited to three layers.
In this embodiment, the in-situ sampling device includes a first in-situ water storage cavity 12a, a second in-situ water storage cavity 12b and a third in-situ water storage cavity 12c, which are sequentially located in the U-shaped tube from top to bottom, respectively, the diameter of the three in-situ water storage cavities is 150mm, the wall thickness is 5mm, the length is adjusted according to the depth of the ground, which can be set to 5m in this embodiment, lateral sample injection holes of the first in-situ water storage cavity 12a, the second in-situ water storage cavity 12b and the third in-situ water storage cavity 12c are respectively plugged by a first layer of filter screen 11a, a second layer of filter screen 11b and a third layer of filter screen 11c, the filter screens are all made of nylon, and the mesh number is 200. The upper end and the lower end of a first in-situ water storage cavity 12a are respectively sealed by a first layer of spiral simple separator 10a and a second layer of spiral simple separator 10b in a separating manner, the upper end and the lower end of a third in-situ water storage cavity 12c are sealed by a third layer of spiral simple separator 10c in a separating manner, the bottom of a U-shaped pipe is sealed by a bottom simple separator 10d, the four simple separators are manufactured and customized by PVC bars, the inner diameter of the four simple separators is 150mm, and 6 small holes with the diameter of 8mm penetrate through the middle of the first layer of spiral simple separator 10a, so that a water supply pipeline penetrates through the four simple separators; 3 small holes with the diameter of 10mm are used for the optical cable to pass through, 4 small holes with the diameter of 8mm are arranged in the middle of the second layer of spiral simple separator 10b, and a water supply pipeline passes through the small holes; 2 small holes with the diameter of 10mm are used for optical cables to pass through, 2 small holes with the diameter of 8mm are arranged in the middle of a third layer of spiral simple separator 10c positioned at the upper end of a third in-situ water storage cavity 12c, and a water supply pipeline passes through; 1 small hole of 10mm for the optical cable to pass through.
A first layer of optical fiber fixing rod 20a, a second layer of optical fiber fixing rod 20b and a third layer of optical fiber fixing rod 20c extend into the first in-situ water storage cavity 12a, the second in-situ water storage cavity 12b and the third in-situ water storage cavity 12c from the top (ground end) of the U-shaped pipe respectively, an optical fiber bragg grating pressure sensor 23a and an optical fiber bragg grating temperature sensor 25a are fixed on the first layer of optical fiber fixing rod 20a, an optical fiber bragg grating pressure sensor 23b and an optical fiber bragg grating temperature sensor 25b are fixed on the second layer of optical fiber fixing rod 20b, and an optical fiber bragg grating pressure sensor 23c and an optical fiber bragg grating temperature sensor 25c are fixed on the third layer of optical fiber fixing rod 20 c. In addition, a first layer of optical fiber traction screws 21a are arranged at the joints of the first layer of optical fiber fixing rods 20a and the first layer of spiral simple separator 10a, a second layer of optical fiber traction screws 21b are arranged at the joints of the second layer of optical fiber fixing rods 20b and the third layer of optical fiber fixing rods 20c and the second layer of spiral simple separator 10b, a third layer of optical fiber traction screws 21c are arranged at the joints of the third layer of optical fiber fixing rods 20c and the third layer of spiral simple separator 10c, the optical fiber traction screws are made of 316L stainless steel, the diameter of external threads of the optical fiber traction screws is 10mm, the thread pitch of the optical fiber traction screws is 1mm, and the inner holes of the screws are 5 mm.
In addition, an optical fiber buffer cylinder 27a is arranged outside the optical fiber Bragg grating pressure sensor 23a and the optical fiber Bragg grating temperature sensor 25a, an optical fiber buffer cylinder 27b is arranged outside the optical fiber Bragg grating pressure sensor 23b and the optical fiber Bragg grating temperature sensor 25b, an optical fiber buffer cylinder 27c is arranged outside the optical fiber Bragg grating pressure sensor 23c and the optical fiber Bragg grating temperature sensor 25c, an optical fiber protection pad 22a and an optical fiber clamp 26a are adopted at the optical fiber position between the gratings in the optical fiber buffer cylinder 27a for fixing and protecting the optical fiber, an optical fiber protection pad 22b and an optical fiber clamp 26b are adopted at the optical fiber position between the gratings in the optical fiber buffer cylinder 27b for fixing and protecting the optical fiber, the optical fiber protection pads adopt fluororubber, the thickness is 3mm, the optical fiber clamp adopts 304 stainless steel, the diameter of the optical fiber clamp can be adjusted, and the approximate range is 6-10 mm.
The first in-situ water storage cavity 12a, the second in-situ water storage cavity 12b and the third in-situ water storage cavity 12c are respectively provided with a filter 34a, a filter 34b and a filter 34c, the filter 34a, the filter 34b and the filter 34c are respectively provided with a ball valve 33a, a ball valve 33b and a ball valve 33c for opening and closing the filters, the upper ends of the ball valves 33a, 33b and 33c are respectively connected with a liquid phase one-way valve 32a, a liquid phase one-way valve 32b and a liquid phase one-way valve 32c, and the filters 34a, 34b and 34c are connected with a high-pressure gas tank N at the ground end through sampling pipelines241 connected to each other, high pressure gas tank N241 is provided with an opening at the front endAnd a ball valve 45, wherein the intermediate flow container 31a is connected to the filter 34a, the intermediate flow container 31b is connected to the filter 34b, the intermediate flow container 31c is connected to the filter 34c, each intermediate flow container is connected to a corresponding in-situ liquid heat and pressure maintaining container 42, and a ball valve 43 for opening and closing the in-situ liquid heat and pressure maintaining container is arranged at the front end of the in-situ liquid heat and pressure maintaining container 42.
Wherein the high pressure gas tank N 241 are connected with corresponding sampling pipelines through a tee joint 44 and a right-angle adapter 47 and provide pressure for the filters 34a, 34b and 34c in the corresponding in-situ water storage cavities 12a, 12b and 12c so as to press the liquid in each in-situ water storage cavity into the corresponding intermediate storage container and enter the corresponding in-situ liquid heat and pressure maintaining container to finish sampling. An insertion screw 46 is provided between the sampling pipe and the packer.
The underground fluid sampling method by using the invention comprises the following steps:
1) the sampling device is assembled according to the design drawing of the invention, and the length of the in-situ water storage cavity and the length of the optical fiber monitoring system are designed according to the required water taking depth. During installation, special attention needs to be paid to protection of the fiber grating sensor, before the U-shaped tube is completely packaged, a demodulator needs to be connected to test the sensing performance of the fiber grating sensor, and the fiber grating sensor is determined to be completely packaged without errors.
2) The system is put into a drill hole, quartz sand with good water permeability is adopted to backfill the periphery of the in-situ water storage cavity, and original clay with poor water permeability is adopted to backfill the periphery of the separator.
3) Before a water sample is formally taken, a drilling and U-shaped pipe system needs to be cleaned firstly. The concrete operation is to open a driving gas tank in the ground system and a front end ball valve thereof, so that water in the sample injection cavity is discharged along one section of the U-shaped pipe under the pressure, and the gas tank and the front end ball valve are closed after the operation is repeated for 3 times.
4) And when a water sample is taken formally, the driving gas tank and the front end ball valve thereof are opened. And opening the in-situ liquid heat and pressure preservation container and a ball valve at the front end of the in-situ liquid heat and pressure preservation container, and closing all the ball valves, the gas tanks and the in-situ liquid heat and pressure preservation container after a water sample with the required volume is obtained.
5) The sampling of different water levels can be realized by operating the front-end gas tank driving ball valve corresponding to the corresponding water level and the in-situ liquid heat and pressure preserving container.
The method for monitoring the temperature, the pressure and the water level of the underground fluid by using the invention comprises the following steps:
1) the sampling device is assembled according to the design drawing of the invention, and the length of the in-situ water storage cavity and the length of the optical fiber monitoring system are designed according to the required water taking depth. During installation, special attention needs to be paid to protection of the fiber grating sensor, before the U-shaped tube is completely packaged, a demodulator needs to be connected to test the sensing performance of the fiber grating sensor, and the fiber grating sensor is determined to be completely packaged without errors.
2) The system is put into a drill hole, quartz sand with good water permeability is adopted to backfill the periphery of the in-situ water storage cavity, and original clay with poor water permeability is adopted to backfill the periphery of the separator.
3) After the drilling hole and the U-shaped pipe system are cleaned, the fiber Bragg grating demodulator, the upper computer connected with the demodulator and data acquisition software of the upper computer are started. And selecting a data storage path, clicking the stored data and starting data acquisition. Therefore, the fiber bragg grating temperature and pressure monitoring system starts the whole process real-time monitoring.
4) From the ground to the bottom, the first grating elevation with the wavelength change of the fiber grating sensor is the water level of underground water.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention should be included in the scope of the present invention.
Claims (3)
1. A U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing is characterized by comprising an in-situ sampling device and a real-time online temperature and pressure monitoring device matched with the in-situ sampling device;
the in-situ sampling device comprises: the device comprises a U-shaped pipe, a driver, a sampling cavity, an intermediate flow storage container, an in-situ liquid heat and pressure preservation container, a liquid-phase one-way valve and a filter, wherein the U-shaped pipe is divided into a multilayer sampling cavity by a spiral simple separator, the filter is positioned in the corresponding sampling cavity, and the upper end of the filter is sequentially provided with a ball valve and the liquid-phase one-way valve; an intermediate flow storage container connected with the filter is arranged in the sampling cavity, and the in-situ liquid heat-preservation and pressure-maintaining container is connected with the intermediate flow storage container through a pipeline;
the real-time online temperature and pressure monitoring device comprises an in-situ water storage cavity, an optical fiber fixing rod arranged in the in-situ water storage cavity, an optical fiber Bragg grating pressure sensor fixed on the optical fiber fixing rod, an optical fiber Bragg grating temperature sensor fixed on the optical fiber fixing rod, an optical fiber traction screw, an optical fiber hoop, an optical fiber protection pad, a signal transmission optical cable connected with the optical fiber Bragg grating temperature and pressure sensor, an optical fiber Bragg grating demodulator connected with the signal transmission optical cable, and an upper computer matched with the optical fiber Bragg grating demodulator;
the water level height monitoring subsystem comprises a packaged fiber Bragg grating temperature sensor and a packaged fiber Bragg grating pressure sensor which are arranged at set positions, and the packaged fiber Bragg grating temperature sensor and the packaged fiber Bragg grating pressure sensor are connected with a fiber Bragg grating demodulator through optical cables;
the system also comprises a fiber Bragg grating temperature and pressure sensor protection subsystem, wherein the fiber Bragg grating temperature and pressure sensor protection subsystem comprises a fiber buffer cylinder for buffering the impact effect brought by fluid flowing in from the sample inlet hole, and the fiber buffer cylinder is arranged at the periphery of the fiber Bragg grating temperature sensor and the fiber Bragg grating pressure sensor;
the optical fiber leading-out subsystem comprises a connecting pipe for leading out optical fibers, a screw hole for placing the optical fiber connecting pipe, a sealing nut for sealing the connecting part and a clamping sleeve.
2. The fiber-sensing-based U-shaped tube real-time temperature and pressure monitoring and in-situ sampling system as claimed in claim 1, wherein a lateral sampling hole is arranged in the in-situ water storage cavity of each independent compartment, and the lateral sampling hole is filled with quartz sand.
3. The real-time temperature and pressure monitoring and in-situ sampling system for the U-shaped tube based on the optical fiber sensing as claimed in claim 1, wherein the optical fiber fixing rod is a high-strength PVC rod and plays a role in supporting and fixing the optical fiber, and the optical fiber Bragg grating pressure sensor and the optical fiber Bragg grating temperature sensor are arranged in parallel in a vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011143853.2A CN112304709B (en) | 2020-10-22 | 2020-10-22 | U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011143853.2A CN112304709B (en) | 2020-10-22 | 2020-10-22 | U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112304709A CN112304709A (en) | 2021-02-02 |
| CN112304709B true CN112304709B (en) | 2021-10-29 |
Family
ID=74327171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011143853.2A Active CN112304709B (en) | 2020-10-22 | 2020-10-22 | U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112304709B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029427B (en) * | 2021-03-15 | 2022-03-01 | 中国矿业大学 | Mine wind pressure measuring device, mine wind pressure detecting system and mine wind pressure detecting method based on fiber bragg grating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108861A (en) * | 2011-03-16 | 2011-06-29 | 中国科学院武汉岩土力学研究所 | Underground layered gas-liquid two phase fluid pressure and temperature-retaining sampling device |
| CN102562036A (en) * | 2012-01-17 | 2012-07-11 | 北京奥飞搏世技术服务有限公司 | Pressure and temperature monitor system of coal gas bed well based on optical fiber sensing |
| CN208350787U (en) * | 2018-07-10 | 2019-01-08 | 中国地质调查局武汉地质调查中心 | A kind of Novel underground water water quality monitoring system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9410380B2 (en) * | 2013-05-02 | 2016-08-09 | Baker Hughes Incorporated | Systems and methods for providing fiber optics in downhole equipment |
-
2020
- 2020-10-22 CN CN202011143853.2A patent/CN112304709B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108861A (en) * | 2011-03-16 | 2011-06-29 | 中国科学院武汉岩土力学研究所 | Underground layered gas-liquid two phase fluid pressure and temperature-retaining sampling device |
| CN102562036A (en) * | 2012-01-17 | 2012-07-11 | 北京奥飞搏世技术服务有限公司 | Pressure and temperature monitor system of coal gas bed well based on optical fiber sensing |
| CN208350787U (en) * | 2018-07-10 | 2019-01-08 | 中国地质调查局武汉地质调查中心 | A kind of Novel underground water water quality monitoring system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112304709A (en) | 2021-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5293931A (en) | Modular, multi-level groundwater sampler | |
| CN110082164B (en) | Underground water multilayer undisturbed monitoring system | |
| US4745801A (en) | Groundwater sampling system | |
| CN111562143A (en) | Automatic multi-parameter groundwater environment layering monitoring well suitable for polluted site | |
| CN106769206B (en) | Modularized underground water single-well multilayer identification sampling system | |
| CN112304709B (en) | U-shaped pipe real-time temperature and pressure monitoring and in-situ sampling system based on optical fiber sensing | |
| CN110716030A (en) | Karst collapse multi-parameter monitoring and early warning test system | |
| CN205719868U (en) | Contaminated soil and subsoil water inject in situ repairs the pilot system that dilation angle determines | |
| KR101555029B1 (en) | Water quality analyzing system and method of radial collecting well | |
| CN210071422U (en) | Underground water multilayer undisturbed monitoring system | |
| KR100869168B1 (en) | Method for testing irrigration sensing temperature of tracer | |
| CN211374743U (en) | Karst collapse multi-parameter monitoring and early warning test system | |
| Everett et al. | Vadose zone monitoring concepts for hazardous waste sites | |
| CN217055130U (en) | Pressure-bearing artesian well drainage test device | |
| CN216524522U (en) | Outer water pressure test equipment of rich water stratum tunnel lining | |
| CN214585393U (en) | Earth pillar test device | |
| CN212301000U (en) | Automatic multi-parameter groundwater environment layering monitoring well suitable for polluted site | |
| CN202329739U (en) | Device for rapidly determining sludge levels of buildings | |
| CN114001857A (en) | External water pressure testing device and testing method for tunnel lining of water-rich stratum | |
| CN113464123A (en) | Rapid water finding method and tubular column for coiled tubing of high-pressure water outlet horizontal well | |
| CN1034773C (en) | Quick detecting method for weak water-contained layer permeable coefficient | |
| KR101282130B1 (en) | Packer system for measuring the physico-chemical properties of groundwater and method of measuring physico-chemical properties of groundwater using the same | |
| CN111879485A (en) | Assembled sleeve, monitoring system applying same and sewage leakage monitoring method | |
| CN214667904U (en) | Ground online monitoring device for chemical parameters of groundwater and water | |
| CN218584591U (en) | Anticorrosion liquid displacement rock core device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |