A temperature-sensitive nano-tracer particle migration and function evaluation test system and method

Abstract

The application belongs to the field of deep earth resource development, and provides a temperature-sensitive nano tracer particle migration and function evaluation test system and method, which has the technical scheme that: including a geological model main body, a nano tracer injection device and a nano particle size real-time measurement device; the geological model main body includes a base frame, a rock medium model is arranged in the base frame, the rock medium model includes two parallel rock plates, a tracer injection hole penetrating to the rock medium model is arranged on one side of the top surface of the base frame, and a water outlet sampling hole penetrating to the rock medium model is arranged on the other side; the nano tracer injection device is communicated through the crack between the tracer injection hole and the rock plate, and the nano particle size real-time measurement device is connected with the water outlet sampling hole. The temperature-sensitive nano tracer particle migration simulation and function evaluation test system and method have high operability, high automation degree and accurate test data.

Description

Technical Field

[0001] This invention belongs to the field of deep earth resource development, and is particularly applicable to the study of the functional response and transport breakthrough process of temperature-sensitive nanoparticles in high-temperature porous media formations. In particular, it relates to a test system and method for the transport and functional evaluation of temperature-sensitive nanoparticle tracers. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In the development of deep resources and energy, clearly defining the characteristics of the formation flow field and temperature field is one of the prerequisites for achieving safe construction and efficient production. For example, in deep mining engineering, understanding the hydraulic characteristics of water passages and the temperature of the water source area is a prerequisite for characterizing the formation flow field and temperature field and formulating water hazard prevention and control plans and indicators. In geothermal engineering, knowing the evolution law of the underground hydrothermal temperature field and clarifying the heat supply channels and supply efficiency are essential to accurately predict the long-term thermal performance under different production enhancement and operation scenarios, and to achieve efficient geothermal extraction and utilization.

[0004] Currently, in the characterization of flow and temperature fields in deep formations, efforts are being made to develop temperature-sensitive nanoparticle materials (those whose fluorescence weakens or disintegrates under high temperatures, releasing dyes, etc.) as tracers. Information on the flow and temperature fields of the formation is obtained through the migration breakthrough curves and functional response characteristics of these nanoparticles, which has become a research frontier both domestically and internationally. However, the development of temperature-sensitive nanoparticle tracers is still in the exploratory stage. There is an urgent need to develop experimental systems suitable for simulating the migration and functional evaluation of temperature-sensitive nanoparticle tracers, providing new ideas and methods for studying the migration and information response characteristics of temperature-sensitive nanoparticles, while simultaneously testing their performance. Summary of the Invention

[0005] To address at least one of the technical problems mentioned above, this invention provides a thermosensitive nanoparticle transport and functional evaluation experimental system and method. This system studies the transport breakthrough laws and functional response characteristics of thermosensitive nanoparticles under different temperatures and fracture structure conditions, thereby achieving the evaluation of the working performance of thermosensitive nanoparticles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a thermosensitive nano-tracer particle transport and functional evaluation test system, including a geological model body (1), a nano-tracer injection device (5), and a nano-particle size real-time measurement device (6);

[0008] The geological model body (1) includes a basic frame (101), and a rock medium model (103) is set inside the basic frame (101). The rock medium model (103) includes two parallel rock plates (1031). One side of the top surface of the basic frame (101) is provided with a tracer injection hole (108) that penetrates to the rock medium model (103), and the other side is provided with a water sampling hole (109) that penetrates to the rock medium model (103). The nano-tracer injection device (5) is connected to the crack between the tracer injection hole (108) and the rock plate (1031). The real-time nanoparticle size measurement device (6) is connected to the water sampling hole (109).

[0009] Furthermore, multiple steel blocks (110) are provided inside the basic frame (101), and the steel blocks (110) are welded to the top or bottom surface of the basic frame (101); each steel block (110) is provided with a limiting slot (8), and the four corners of the rock slab (131) are embedded in the limiting slot (8), and each corner is embedded with a nut (132), and a bolt (133) is threadedly connected to the nut 132 at the limiting slot (8); the gap between the two rock slabs (131) is adjusted by the bolt (133).

[0010] Furthermore, the basic frame (101) also includes a water flow buffer tank (102), which is located at the water inlet of the geological model body (1) and has two flow stabilizing plates (121) inside, which are welded to the water inlet of the rock medium model (103) to stabilize the water flow.

[0011] Furthermore, the system also includes a water heating device (2), which includes a water heating tank (201) and a constant flow water pump (202). The first side of the basic frame (101) is provided with a water inlet (105). One end of the constant flow water pump (202) is connected to the water heating tank (201) through a pipeline and communicates with the water heating tank (201). The other end is connected to the water inlet (105) through a pipeline. The water heating tank (201) includes a tank body (211). A heater (212) is provided on the inner wall of the tank body (211), and a stirrer (213) is fixed on the outer wall.

[0012] Furthermore, the second side of the basic frame (101) is provided with a waste liquid discharge port (106), and both the water inlet (105) and the waste liquid discharge port (106) are equipped with valves.

[0013] Furthermore, the system also includes a constant temperature control device (3), and the geological model body (1) also includes a radiator (104). The radiator (104) is arranged on the upper and lower sides of the rock medium model 103, and the constant temperature control device (3) is connected to the radiator (104).

[0014] Furthermore, the system also includes a water pressure monitoring device (4), and level gauge mounting holes (107) are provided on both sides of the top surface of the base frame (101) to install the water pressure monitoring device (4).

[0015] Furthermore, the system also includes a real-time nanoparticle size measuring device (6) and an automatic sampling device (7). A water sampling hole (109) is provided on the top surface of the basic frame (101). The water sampling hole (109) is connected to the real-time nanoparticle size measuring device (6), and the drain port of the real-time nanoparticle size measuring device (6) is connected to the automatic sampling device (7).

[0016] Furthermore, the basic frame (101) is a box structure with a cover structure on the front panel.

[0017] A second aspect of the present invention provides a method for evaluating the transport and function of thermosensitive nanoparticles, employing the thermosensitive nanoparticle transport and function evaluation system described in the first aspect, comprising the following steps:

[0018] Step 1: Select a rock slab (131) according to the experimental requirements and assemble it into the main body of the geological model (1);

[0019] Step 2: Adjust the gap between the two rock plates (131) to the test setting requirements by tightening the bolts (133), open the valves of the water inlet (105) and the waste liquid discharge outlet (106), fill the heated water tank (201) with water, turn on the constant flow water pump (202), rinse the geological model body (1), and close the valve of the waste liquid discharge outlet (106) after the clean water is discharged.

[0020] Step 3: After confirming that there is no water leakage in the system as a whole and that the connections between each part of the device and the pipeline are unobstructed, turn on the heater (212) of the heating water storage tank and the constant temperature control device (3) in sequence, and set them to the predetermined test temperature.

[0021] Step 4: Turn on the stirrer (213), adjust the water ion concentration, pH and organic matter content in the heated water tank (201) to the preset test conditions, and stir and heat thoroughly;

[0022] Step 5: After the water reaches the set temperature, turn on the real-time nanoparticle size measurement device (6) and the automatic sampling device (7). After the automatic sampling device (7) stabilizes the sampling, turn on the nano tracer injection device (5) and inject the nano tracer continuously, intermittently or instantaneously according to the injection amount and injection rate required by the test.

[0023] Step 6: Obtain the breakthrough curve of the nano-tracer and the distribution curve of the nanoparticles, and perform fluorescence, infrared, and spectral measurements on the collected water samples to analyze the functional response of the temperature-sensitive nanoparticles and evaluate the feasibility of the particle function. Compared with the prior art, the beneficial effects of this invention are:

[0024] 1. This invention fills the gap in research equipment for testing and evaluating the working performance of temperature-sensitive nanotracers. It provides a highly operable, automated, and accurate experimental system for evaluating the transport and function of temperature-sensitive nanotracer particles. This system can be used to study the breakthrough laws and functional response characteristics of temperature-sensitive nanoparticle transport under different temperature and fracture structure conditions, thereby achieving the evaluation of the working performance of temperature-sensitive nanoparticles. This will help promote the development and application of temperature-sensitive nanotracers and serve the development of deep earth resources / energy.

[0025] 2. The rock medium model of this invention is separated from the main model, which is convenient for disassembly and replacement. It is fixed by bolt suspension and can freely adjust the crack opening degree, which meets the replacement requirements of different rock medium conditions (rock type, crack surface roughness, tortuosity and opening degree, etc.) in the experiment, simplifies the experimental operation process and reduces the experimental cost.

[0026] 3. The inclusion of a constant temperature control device and radiator improves the stability of the temperature environment surrounding the rock medium model, ensuring the accuracy of temperature parameters during the experiment. The real-time nanoparticle size measurement device enables instant monitoring of particle transport during the experiment, allowing for immediate assessment of the experiment's effectiveness and adjustment of the experimental plan, thus improving experimental efficiency. The entire experimental system is connected by piping, facilitating disassembly and storage.

[0027] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0029] Figure 1 This is a schematic diagram of the overall structure of a thermosensitive nanoparticle transport and functional evaluation experimental system provided in an embodiment of the present invention;

[0030] Figure 2 This is a detailed schematic diagram of the rock slab fixing method provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the rock slab structure provided in an embodiment of the present invention.

[0032] The components include: 1. Geological model body; 101. Basic frame; 102. Water flow buffer tank; 121. Flow stabilizing plate; 103. Rock medium model; 131. Rock slab; 132. Nut; 133. Bolt; 104. Radiator; 105. Water inlet; 106. Waste liquid discharge outlet; 107. Liquid level gauge mounting hole; 108. Tracer injection hole; 109. Water outlet sampling hole; 110. Steel block; 2. Heating water supply device; 201. Heating water storage tank; 211. Water tank body; 212. Heater; 213. Stirrer; 202. Constant flow water pump; 3. Constant temperature control device; 4. Water pressure monitoring device; 5. Nano tracer injection device; 6. Nano particle size real-time measurement device; 7. Automatic sampling device; 8. Limiting slot. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] In this invention, terms such as "above," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements of this invention, and do not specifically refer to any component or element in this invention, nor should they be construed as limiting this invention.

[0037] In this invention, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0038] Example 1

[0039] like Figure 1As shown, this embodiment provides a temperature-sensitive nano-tracer particle transport and functional evaluation test system, including a geological model body 1, a heating water supply device 2, a constant temperature control device 3, a water pressure monitoring device 4, a nano-tracer injection device 5, a nano-particle size real-time measurement device 6, and an automatic sampling device 7.

[0040] The geological model body 1 includes a basic frame 101, a water flow buffer tank 102, a rock medium model 103, and a radiator 104 installed inside the basic frame 101. The water flow buffer tank 102 is located at the water inlet of the geological model body 1 and has two flow stabilizing plates 121 inside, which are welded to the water inlet of the rock medium model 103 to stabilize the water flow. The rock medium model 103 has radiators 104 arranged on its upper and lower sides.

[0041] The basic frame 101 has a water inlet 105 on the lower part of the first side and a waste liquid discharge outlet 106 in the middle of the second side. One side of the top surface has a level gauge mounting hole 107 and a tracer injection hole 108 that penetrate to the rock medium model 103. The other side of the top surface has a level gauge mounting hole 107 and a water sampling hole 109 that penetrate to the rock medium model 103. A water pressure monitoring device 4 is installed through the level gauge mounting hole 107. The tracer injection hole 108 is connected to a nano-tracer injection device 5. The nano-tracer injection device 5 is connected to the cracks in the rock medium model 103 through the tracer injection hole 108. The water sampling hole 109 is connected to a real-time nanoparticle size measurement device 6. The drain port of the real-time nanoparticle size measurement device 6 is connected to an automatic sampling device 7 to collect liquid samples.

[0042] Valves are installed at both the water inlet 105 and the waste liquid discharge outlet 106.

[0043] Specifically, four steel blocks 110 are provided inside the basic frame 101 and are sealed and welded to the top and bottom surfaces of the basic frame 101. The space formed by the first steel block, the second steel block and the basic frame 101 constitutes a water flow buffer tank 102.

[0044] Specifically, the first steel block is welded to the top surface of the foundation frame 101, the second steel block is welded to the bottom surface of the foundation frame 101, and a gap is set between the first steel block and the second steel block.

[0045] Preferably, the first steel block and the second steel block are 30-40 mm away from the first side of the foundation frame 101, and the first steel block and the second steel block are spaced 5 mm apart;

[0046] The third steel block is welded to the top surface of the foundation frame 101, and the fourth steel block is welded to the bottom surface of the foundation frame 101. Similarly, preferably, the third steel block and the fourth steel block are spaced 5mm apart.

[0047] like Figure 2 and Figure 3 As shown, each steel block is provided with a limiting groove 8. The rock medium model 103 includes two parallel rough rock plates 131. The four corners of the rock plates 131 are embedded in the limiting groove 8, and each corner is embedded with a nut 132. Bolts 133 are threadedly connected to the nuts 132 in the limiting groove 8.

[0048] There are four bolts 133 in total, corresponding to the four bolts on the rock plate 131. After the bolts 133 are tightened to contact the bottom surface of the limiting groove 8, the rock plate 131 can be lifted up by continuing to tighten the bolts 133, which provides an upward force and drives the rock plate 131 to move upward in the limiting groove 8, thereby increasing the gap between the parallel rock plates. At the same time, if the bolts 133 are loosened, the rock plate 131 can be moved downward to reduce the gap between the parallel rock plates, thereby adjusting the opening and closing degree of the crack.

[0049] In this embodiment, the basic frame 101 is a box structure with dimensions of 600mm×300mm×100mm. The front panel is provided with an opening structure with a length-to-width ratio of 2:1.

[0050] The rock slab can be made of natural rocks with high flexural strength, such as granite and sandstone, or it can be replaced by simulated rock materials such as acrylic sheets, steel plates, and cement mortar boards, depending on the test requirements.

[0051] Preferably, the width of the water flow buffer tank 102 is 30-40 mm.

[0052] The heating water supply device 2 includes a heating water storage tank 201 and a constant flow water pump 202; one end of the constant flow water pump 202 is connected to the heating water storage tank 201 through a pipeline and communicates with the heating water storage tank 201, and the other end is connected to the water inlet 105 of the geological model body 1 through a pipeline.

[0053] The heated water storage tank 201 includes a tank body 211, a heater 212 is provided on the inner wall of the tank body 211, one end of a stirrer 213 is fixed on the outer wall, and the other end is placed above the tank body 211.

[0054] The heating water supply device 2 is used for the preparation (ion concentration, pH, organic matter content, etc.) and storage of high-temperature groundwater fluid;

[0055] In this embodiment, the constant flow water pump 202 is a peristaltic pump used for water flow rate and velocity adjustment and recording.

[0056] The constant temperature control device 3 is connected to the radiator 104 and is used for heat supply and temperature regulation of the geological model body 1 to simulate and maintain the high temperature environment of the deep rock mass.

[0057] In this embodiment, the water pressure monitoring device 4 adopts a transparent tubular liquid level gauge, which is respectively placed at the four corners of the geological model body 1. The pressure change in the geological model can be calculated by the liquid level difference at the four corners.

[0058] In this embodiment, the nano-tracer injection device 5 adopts an injection-type micro-feed pump, which is connected to the rock medium model 103 through a pipeline via the tracer injection hole 108 near the water inlet end on the top surface of the geological model body. It is used to control the continuous, intermittent or instantaneous injection of nano-tracers and the injection volume, injection rate and other parameters.

[0059] The real-time nanoparticle size measurement device 6 adopts the adjustable resistance pulse sensing measurement principle. It is connected to the water sampling hole 109 on the top surface of the geological model through a pipeline. It is used to monitor and record the nanoparticle size data in the outflowing water in real time. During the experiment, the particle size distribution curve of the nanoparticles can be obtained, realizing real-time monitoring of the entire experiment and facilitating the adjustment of experimental parameters.

[0060] Example 2

[0061] This embodiment provides an experimental method for evaluating the transport and function of temperature-sensitive nanoparticle tracers, including the following steps:

[0062] Step 1: Select rock slab 131 according to the experimental requirements and assemble it into the main body 1 of the geological model;

[0063] Step 2: Adjust the gap between the two rock plates 131 to the test setting requirements by tightening bolt 133, open the water inlet 105 and waste liquid outlet 106 valves, fill the heated water tank 201 with water, turn on the constant flow water pump 202, rinse the geological model body 1, and close the waste liquid outlet 106 valve after the clean water is discharged.

[0064] Step 3: After confirming that there is no water leakage in the system as a whole and that the connections between each part of the device and the pipeline are unobstructed, turn on the heater 212 of the heating water storage tank and the constant temperature control device 3 in sequence, and set them to the predetermined test temperature.

[0065] Step 4: Turn on the stirrer 213, adjust the water ion concentration, pH and organic matter content in the heated water tank 201 to the preset test conditions, and stir and heat for 10 to 20 minutes.

[0066] Step 5: After the water reaches the set temperature, turn on the real-time nanoparticle size measurement device 6 and the automatic sampling device 7. After the automatic sampling device 7 stabilizes the sampling, turn on the nano tracer injection device 5 and inject the nano tracer continuously, intermittently or instantaneously according to the injection amount and injection rate required by the test.

[0067] Step 6: Obtain the breakthrough curve of the nano-tracer and the distribution curve of the nanoparticles, and perform fluorescence, infrared and spectral measurements on the collected water samples to analyze the functional response of the temperature-sensitive nanoparticles and evaluate the feasibility of the particle function.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A thermosensitive nanoparticle transport and functional evaluation experimental system, characterized in that, It includes a geological model body (1), a nano tracer injection device (5), and a real-time nanoparticle size measurement device (6). The geological model body (1) includes a basic frame (101), a rock medium model (103) is set inside the basic frame (101), the rock medium model (103) includes two parallel rock plates (131), one side of the top surface of the basic frame (101) is provided with a tracer injection hole (108) that penetrates to the rock medium model (103), and the other side is provided with a water sampling hole (109) that penetrates to the rock medium model (103); the nano tracer injection device (5) is connected to the crack between the tracer injection hole (108) and the rock plate (131), and the real-time nanoparticle size measurement device (6) is connected to the water sampling hole (109); Multiple steel blocks (110) are set inside the basic frame (101), and the steel blocks (110) are welded to the top or bottom surface of the basic frame (101); each steel block (110) is provided with a limiting groove (8), and the four corners of the rock slab (131) are embedded in the limiting groove (8), and each corner is embedded with a nut (132). Bolts (133) are threadedly connected to the nuts 132 in the limiting groove (8); the gap between the two rock slabs (131) is adjusted by the bolts (133); The basic frame (101) also includes a water flow buffer tank (102), which is located at the water inlet of the geological model body (1) and has two flow stabilizing plates (121) inside, which are welded to the water inlet of the rock medium model (103) to stabilize the water flow. The system also includes a constant temperature control device (3), and the geological model body (1) also includes a radiator (104). The radiator (104) is arranged on the upper and lower sides of the rock medium model 103, and the constant temperature control device (3) is connected to the radiator (104).

2. The thermosensitive nanoparticle transport and functional evaluation experimental system as described in claim 1, characterized in that, The system also includes a water heating device (2), which includes a water heating tank (201) and a constant flow water pump (202). The first side of the basic frame (101) is provided with a water inlet (105). One end of the constant flow water pump (202) is connected to the water heating tank (201) through a pipeline and communicates with the water heating tank (201). The other end is connected to the water inlet (105) through a pipeline. The water heating tank (201) includes a tank body (211). A heater (212) is provided on the inner wall of the tank body (211), and a stirrer (213) is fixed on the outer wall.

3. The thermosensitive nanoparticle transport and functional evaluation experimental system as described in claim 2, characterized in that, The second side of the basic frame (101) is provided with a waste liquid discharge port (106), and both the water inlet (105) and the waste liquid discharge port (106) are equipped with valves.

4. The thermosensitive nanoparticle transport and functional evaluation experimental system as described in claim 1, characterized in that, The system also includes a water pressure monitoring device (4). Liquid level gauge mounting holes (107) are provided on both sides of the top surface of the base frame (101), and the water pressure monitoring device (4) is installed through the liquid level gauge mounting holes (107).

5. The thermosensitive nanoparticle transport and functional evaluation experimental system as described in claim 1, characterized in that, The system also includes a real-time nanoparticle size measuring device (6) and an automatic sampling device (7). A water sampling hole (109) is provided on the top surface of the basic frame (101). The water sampling hole (109) is connected to the real-time nanoparticle size measuring device (6). The drain port of the real-time nanoparticle size measuring device (6) is connected to the automatic sampling device (7).

6. The thermosensitive nanoparticle transport and functional evaluation experimental system as described in claim 1, characterized in that, The basic frame (101) is a box structure with a cover structure on the front panel.

7. A method for evaluating the transport and function of thermosensitive nanoparticle tracers, employing the thermosensitive nanoparticle tracer transport and function evaluation system described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Select a rock slab (131) according to the experimental requirements and assemble it into the main body of the geological model (1); Step 2: Adjust the gap between the two rock plates (131) to the test setting requirements by tightening the bolts (133), open the water inlet (105) and waste liquid outlet (106) valves, fill the heating water tank (201) with water, turn on the constant flow water pump (202) to rinse the geological model body (1), and close the waste liquid outlet (106) valve after the clean water is discharged; Step 3: After confirming that there is no water leakage in the system as a whole and that the connections between each part of the device and the pipeline are unobstructed, turn on the heater (212) of the heating water tank and the constant temperature control device (3) in sequence, and set them to the predetermined test temperature; Step 4: Turn on the stirrer (213), adjust the water ion concentration, pH and organic matter content in the heated water tank (201) to the preset test conditions, and stir and heat thoroughly; Step 5: After the water reaches the set temperature, turn on the real-time nanoparticle size measurement device (6) and the automatic sampling device (7). After the automatic sampling device (7) stabilizes the sampling, turn on the nano tracer injection device (5) and inject the nano tracer continuously, intermittently or instantaneously according to the injection amount and injection rate required by the test. Step 6: Obtain the breakthrough curve of the nano-tracer and the distribution curve of the nanoparticles, and perform fluorescence, infrared and spectral measurements on the collected water samples to analyze the functional response of the temperature-sensitive nanoparticles and evaluate the feasibility of the particle function.

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