Porous medium evaluation device and method for controlling oil drainage

Abstract

The invention relates to the technical field of porous medium characteristic evaluation, and provides a porous medium evaluation device and method for controlling oil drainage, the device comprises a drainage oil storage tank and a reaction tank, the drainage oil storage tank and the reaction tank are detachably connected, the top of the drainage oil storage tank is provided with an oil inlet, and the bottom of the reaction tank is provided with an oil outlet; a flow meter is arranged at the oil outlet, an oil drainage switch panel is arranged at the bottom of the oil drainage storage tank, a reaction channel used for containing porous media is arranged in the reaction tank, and a plurality of differential pressure gauges are embedded in the inner wall of the reaction tank. Therefore, theoretical and data support is provided for constructing a porous medium isolation belt surrounding leakage prevention and control of different oil products.

Description

Technical Field

[0001] This invention relates to the field of porous media characteristic evaluation technology, and more specifically, to a porous media evaluation device and method for controlling oil leakage. Background Technology

[0002] Oil spills are frequent worldwide. Because continuous oil leaks are not physically confined horizontally, the initial kinetic energy of the leaked oil creates momentum both horizontally and vertically. When flowing through a porous medium with sufficient permeability, the vertical flow increases, thus reducing the horizontal flow and controlling the flow range. However, current literature lacks specific experimental setups and research methods to demonstrate the permeability of different oils in various types of porous media. Consequently, there is a lack of data to support the use of suitable porous media systems for preventing oil spills, resulting in certain drawbacks in applying porous media for oil spill prevention. Summary of the Invention

[0003] The purpose of this application is to provide a porous media evaluation device for controlling oil leakage. It can accurately measure the vertical permeability and differential pressure data of different porous media systems to oil products through differential pressure gauges and flow meters, and quantitatively analyze the influence of parameters such as porous media type, length, and cross-sectional area on the permeability characteristics of oil products. This provides a systematic theoretical basis and experimental data support for constructing porous media isolation zones for the prevention and control of leakage of different oil products, and solves the problem of lack of quantitative evaluation methods for the permeability of porous media in the prior art.

[0004] Another objective of this application is to provide a method for evaluating porous media that controls oil leakage.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows:

[0006] On one hand, this application provides a porous media evaluation device for controlling oil leakage, including an oil leakage storage tank and a reaction tank. The oil leakage storage tank and the reaction tank are detachably connected. The top of the oil leakage storage tank is provided with an oil inlet, and the bottom of the reaction tank is provided with an oil outlet. A flow meter is provided at the oil outlet. An oil leakage switch panel is provided at the bottom of the oil leakage storage tank. The reaction tank has a reaction channel for containing porous media, and multiple differential pressure gauges are embedded in the inner wall of the reaction tank.

[0007] This device can be assembled to form porous media with different permeability according to requirements, enabling the analysis of the vertical permeability of different oil products. This provides support for preventing leaks of different oil products and constructing an efficient porous media isolation zone. The selected finished oil is pumped into the drain storage tank at the required flow rate, and then flows into the porous media to be tested through the drain switch panel. The diameter of the porous media is consistent with the inner diameter of the reaction tank. It consists of cylinders filled with quartz sand particles with specific surface tension and permeability. Cylinders with different surface tensions and permeabilities are prepared in advance according to requirements, constructing porous media channels with different permeability. The cylinders inside the channels are replaced according to requirements for each experiment. The cylinders are formed by filling quartz sand with a hydraulic press at a preset pressure. Different combinations, filling pressures, and types of quartz sand will result in different permeability. After the oil flows out through the porous media, the filtration velocity is obtained through a flow meter, and the pressure difference at the outer edge of the porous media during filtration is obtained through a differential pressure gauge. This determines the permeability of this type of oil under this type of porous media and conditions, providing data support for constructing the drain isolation zone.

[0008] Furthermore, the aforementioned oil drain storage tank has a depth of 10cm, an inner diameter of 20.5cm, and an outer diameter of 21cm. A flow guide pipe with a diameter of 2cm is installed at the oil inlet to stably supply oil and ensure that the oil can enter the oil drain storage tank and diffuse.

[0009] Furthermore, the aforementioned porous medium is composed of quartz sand particles, which are cylindrical in shape, 30cm long and 20.5cm in diameter.

[0010] Furthermore, the device also includes an oil overflow collection tank, and the top of the oil overflow storage tank is provided with an oil overflow port. The oil overflow collection tank is connected to the inside of the oil overflow storage tank through the oil overflow port.

[0011] Furthermore, the aforementioned reaction vessel is equipped with a limiting ring, which is fixedly connected to the inner wall of the reaction vessel to support the porous medium.

[0012] Furthermore, a filter screen is also provided between the porous medium and the limiting ring.

[0013] Furthermore, a funnel-shaped oil drain and collection trough is provided at the bottom of the aforementioned reaction tank, and the output end of the oil drain and collection trough is connected to the oil outlet.

[0014] Furthermore, the aforementioned oil outlet is equipped with a pipeline connected to the output end of the oil drain and collection tank, and the pipeline has a diameter of 0.3 cm.

[0015] Furthermore, a filter membrane is installed at the output end of the aforementioned oil drain and collection tank.

[0016] Furthermore, the aforementioned oil drain switch panel includes a panel body, the panel body having a cross-shaped oil drain groove, and a cover adapted to the cross-shaped oil drain groove on the panel body, the cover being slidably connected to the inner wall of the oil drain storage tank.

[0017] Furthermore, the cover is electrically slidably connected to the inner wall of the oil storage tank, and the cover is slidable by a motor.

[0018] It should be noted that the electrical sliding connection between the cover and the inner wall of the oil storage tank is existing technology. There are various connection methods, and any method that satisfies the electric lifting effect of the cover can be used. No limitation is made here.

[0019] Furthermore, the outer wall of the aforementioned cover is circumferentially covered with a sealing ring.

[0020] Furthermore, the device also includes a recovery tank located at the oil outlet, used to recover the oil that has passed through the porous medium.

[0021] On the other hand, embodiments of this application provide a method for evaluating porous media that controls oil leakage, comprising the following steps:

[0022] S1. Determine the type of finished oil to be used in the experiment, and use a viscometer to measure the viscosity of the finished oil. Determine the type of porous medium to be used in the experiment, as well as the length and cross-sectional area of ​​the porous medium.

[0023] S2. Place the porous medium into the reaction channel, set the flow rate to 1mL / min-600mL / min, pump the finished oil into the drain storage tank, open the drain switch panel, record the drain flow rate through the flow meter, and record the differential pressure through the differential pressure gauge.

[0024] S3. Based on the drain flow rate, calculate the vertical permeability of the refined oil at the specified flow rate. The calculation formula is as follows:

[0025] As shown in Equation 1:

[0026]

[0027] Where: K - permeability, D; Q - oil drain velocity, cm 3 / s; μ - viscosity of finished oil, mPa·s; L - length of porous media, cm; A - cross-sectional area of ​​porous media, cm² 2 Δp - Pressure difference of finished oil passing through porous media, MPa.

[0028] The above steps can determine the permeability of refined oil under a certain type of porous medium. According to steps S2 and S3, the vertical permeability is tested for different refined oils, different pumping velocities, and different porous medium types. Based on the obtained parameters, the permeability is calculated according to step S3. Based on the characteristics of the oil depot and the on-site conditions of the oil pipeline, the potential leakage risk is obtained. Then, the required porous medium type, arrangement thickness, and width are calculated to realize the selection, arrangement, and design of porous medium isolation zones for leakage prevention of different oil products.

[0029] Compared with the prior art, the embodiments of this application have at least the following advantages or beneficial effects:

[0030] 1. Multiple differential pressure gauges embedded in the inner wall of the reaction tank can monitor the pressure difference changes of oil through the porous medium in real time, and the flow meter at the oil outlet can accurately record the oil discharge velocity. Combined with the calculation formula, the vertical permeability of the oil can be quantified, providing accurate support for data acquisition.

[0031] 2. The reaction channel inside the reaction tank provides a standardized containment space for porous media. With the help of differential pressure gauges and flow meters, the influence of different porous media on the permeability of oil can be systematically analyzed, providing a quantitative basis for the design of leak prevention and control isolation zones.

[0032] 3. The parameters such as permeability obtained by this device can be directly applied to leakage risk assessment in scenarios such as oil depots and oil pipelines, guiding the selection of porous media isolation zones, the design of their thickness and width, and improving the scientificity and effectiveness of leakage prevention and control. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the device structure provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the oil drain switch panel structure provided by the present invention.

[0036] Icons: 100-Oil drain storage tank; 110-Oil inlet; 120-Oil drain switch panel; 121-Star-shaped oil drain trough; 122-Cover; 130-Overflow port; 200-Reaction tank; 210-Oil outlet; 220-Flow meter; 230-Differential pressure gauge; 240-Limit ring; 250-Filter screen; 260-Oil drain collection trough; 270-Filter membrane; 300-Overflow collection tank. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply.

[0038] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0039] Example 1

[0040] Please refer to Figure 1-2 , Figure 1 The diagram shown is a structural schematic of an embodiment of this application; Figure 2 The diagram shown is a structural schematic of the oil drain switch panel 120 according to an embodiment of this application.

[0041] This embodiment provides a porous media evaluation device for controlling oil leakage, including an oil leakage storage tank 100 and a reaction tank 200. The oil leakage storage tank 100 and the reaction tank 200 are detachably connected. The top of the oil leakage storage tank 100 is provided with an oil inlet 110, and the bottom of the reaction tank 200 is provided with an oil outlet 210. A flow meter 220 is provided at the oil outlet 210. An oil leakage switch panel 120 is provided at the bottom of the oil leakage storage tank 100. The reaction tank 200 has a reaction channel for containing porous media, and multiple differential pressure gauges 230 are embedded in the inner wall of the reaction tank 200.

[0042] The aforementioned oil drain and storage tank 100 has a depth of 10cm, an inner diameter of 20.5cm, and an outer diameter of 21cm. A flow guide pipe with a diameter of 2cm is installed at the oil inlet 110 to stably supply oil and ensure that the oil can enter the oil drain and storage tank 100 and diffuse.

[0043] The aforementioned porous medium is composed of quartz sand particles, and is cylindrical in shape, with a length of 30cm and a diameter of 20.5cm.

[0044] like Figure 1 As shown, in order to maintain the flow rate of the pumped oil and to treat the overflowing oil, the device also includes an overflow collection tank 300. The top of the oil storage tank 100 is provided with an overflow port 130. The overflow collection tank 300 is connected to the inside of the oil storage tank 100 through the overflow port 130. The overflow collection tank 300 is designed so that under high flow rate, the porous medium has a limited capacity to allow the oil to pass through. Excess oil that exceeds the depth of the oil storage tank 100 enters the overflow collection tank 300. Since it is necessary to maintain the flow rate of the pumped oil, when the permeability of the porous medium is insufficient, the overflow collection tank 300 is selected to collect the overflowing oil without affecting the continued pumping of oil, thereby providing accurate experimental data.

[0045] like Figure 1 As shown, in order to keep the porous medium suspended, the reaction vessel 200 is provided with a limiting ring 240. The limiting ring 240 is fixedly connected to the inner wall of the reaction vessel 200 and is used to support the porous medium. The limiting ring 240 provides support for the porous medium in the reaction vessel 200, so that the porous medium is suspended and stable in the reaction vessel 200, which facilitates the permeation and outflow of oil. If the porous medium is in direct contact with the bottom of the reaction vessel 200, it will affect the outflow of the permeated oil and affect the outflow rate, thus causing inaccurate experimental results.

[0046] like Figure 1 As shown, in order to prevent sand particles in the porous medium from affecting the flow rate data, a filter screen 250 is also provided between the porous medium and the limiting ring 240. Since the porous medium is made of quartz sand particles, it may loosen and the quartz sand particles may fall off when the oil passes through. When the fallen quartz sand particles pass through the oil outlet 210, they will cause inaccurate data of the flow meter 220, and there is also a risk of the porous medium collapsing. Therefore, a filter screen 250 is provided, wherein the pore size of the filter screen 250 is smaller than the particle size of the quartz sand particles to ensure that the sand particle falling off rate is less than 95%.

[0047] like Figure 1 As shown, to ensure the accuracy of the flow rate, a funnel-shaped oil drain and collection trough 260 is provided at the bottom of the reaction tank 200. The output end of the oil drain and collection trough 260 is connected to the oil outlet 210. Since the flow rate of the filtered oil needs to be obtained, the filtered oil needs to directly enter the oil outlet 210 after filtration and be tested by the flow meter 220. Therefore, a funnel-shaped oil drain and collection trough is provided, which allows the falling oil to flow directly into the oil outlet 210, preventing the oil from staying in the reaction tank 200, ensuring the accuracy of the flow rate, and making the result data more accurate.

[0048] A pipeline is installed at the oil outlet 210, which is connected to the output end of the oil drain and collection tank 260. The pipeline has a diameter of 0.3cm.

[0049] like Figure 1 As shown, in order to further ensure that the flow rate is not affected by solid particles, a filter membrane 270 is provided at the output end of the oil drain and collection tank 260 to prevent solid particles from falling into the oil outlet 210, which would affect the flow rate measurement of the flow meter 220 and cause inaccurate experimental data.

[0050] like Figure 2 As shown, the aforementioned oil drain switch panel 120 includes a panel body with a star-shaped oil drain groove 121. A cover 122 adapted to the star-shaped oil drain groove 121 is provided on the panel body. The cover 122 is electrically slidably connected to the inner wall of the oil drain storage tank 100. The oil drain switch panel 120 can control the outflow of oil from the oil drain storage tank 100. The star-shaped oil drain groove ensures the uniformity of oil falling into the porous medium, preventing oil from concentrating at a single point in the porous medium, thus ensuring that the porous medium is filled with oil and ensuring the accuracy of the test. When closed, the cover 122 is embedded in the star-shaped oil drain groove 121, closing the channel of the star-shaped oil drain groove 121 and preventing oil from flowing out. When open, through the sliding connection with the inner wall of the oil drain storage tank 100, the cover 122 rises, the star-shaped oil drain groove 121 is unblocked, and the oil flows out for subsequent experiments.

[0051] To enhance the sealing between the cover 122 and the cross-shaped oil drain groove 121, a sealing ring is circumferentially wrapped around the outer wall of the cover 122. The sealing ring allows the cover 122 to fit more snugly and the connection to be tighter when it is lowered back into the cross-shaped oil drain groove 121. The two parts are in an interference fit, thereby achieving a better sealing effect and preventing the oil from flowing out.

[0052] In order to recover the experimental oil, the device also includes a recovery tank located at the oil outlet 210, which is used to recover the oil that has passed through the porous medium.

[0053] During use, the selected oil is pumped into the drain storage tank 100 at the required flow rate and then flows into the porous medium to be tested through the drain switch panel 120. The diameter of the porous medium is consistent with the inner diameter of the reaction tank. It is a cylinder filled with quartz sand particles with known surface tension and permeability. The cylinder inside the channel is replaced as needed for each experiment. After the oil flows out through the porous medium, the filtration flow rate is obtained through the flow meter 220 and the pressure difference at the outer edge of the porous medium during filtration is obtained through the differential pressure gauge 230. This determines the permeability of this type of oil under this type of porous medium and conditions. The oil that overflows during the process enters the overflow collection tank 300 for recovery, and the oil that flows out during the experiment is recovered through the recovery tank.

[0054] Example 2

[0055] To better illustrate the present invention, based on Example 1, Example 2 provides a method for evaluating porous media that controls oil leakage, comprising the following steps:

[0056] S1. The type of finished oil used in the experiment is specified as No. 0 diesel, with a dynamic viscosity of 5 mm at 20℃. 2 / s, density is 0.85g / cm³ 3 The apparent viscosity was 5.88 mPa·s. It was determined that the porous medium used in the experiment was 100-mesh acid-washed quartz sand, and the filling was completed by filling 10 times under a pressure of 10 MPa.

[0057] S2. Place the pickled quartz sand into the reaction channel, set the flow rate to 100 mL / min, pump No. 0 diesel into the drain oil storage tank 100, and when the required oil storage thickness of 3 cm is reached, open the drain switch panel 120, and the stored oil begins to leak gradually. Record the drain flow rate as 30 mL / min through the flow meter 220, and record the pressure difference as 14.8 MPa through the differential pressure gauge 230.

[0058] S3. Based on the drain flow rate, calculate the vertical permeability of the refined oil at the specified flow rate. The calculation formula is as follows:

[0059] As shown in Equation 1:

[0060]

[0061] Where: K - permeability, D; Q - oil drain velocity, cm 3 / s; μ - viscosity of finished oil, mPa·s; L - length of porous media, cm; A - cross-sectional area of ​​porous media, cm² 2 Δp - Pressure difference of finished oil passing through porous media, MPa.

[0062] The permeability k calculated from Equation 1 is 791 mD.

[0063] Example 3

[0064] This embodiment 3 is basically the same as embodiment 2, except that the porous medium is 80-mesh acid-washed quartz sand, the flow meter 220 obtains a vertical seepage flow rate of 45 mL / min, and the permeability k is calculated to be 1186 mD by formula 1.

[0065] Example 4

[0066] This Example 4 is basically the same as Example 2, except that the porous medium is 60-mesh acid-washed quartz sand, the flow meter 220 obtains a vertical seepage flow rate of 51 mL / min, and the permeability k is calculated to be 1344 mD by Equation 1.

[0067] Example 5

[0068] This Example 5 is basically the same as Example 2, except that the finished oil is 92-octane gasoline with a density of 0.725 g / cm³. 3 The dynamic viscosity is 0.62 mm. 2 / s, apparent viscosity is 0.825mPa·s, set flow rate is 500mL / min, flow meter 220 obtains vertical seepage flow rate of 214mL / min. The permeability k is calculated to be 791mD by Equation 1.

[0069] Example 6

[0070] This embodiment 6 is basically the same as embodiment 5, except that the porous medium is 80-mesh acid-washed quartz sand, the flow meter 220 obtains a vertical seepage flow rate of 321 mL / min, and the permeability k is calculated to be 1186 mD by formula 1.

[0071] Example 7

[0072] This embodiment 7 is basically the same as embodiment 5, except that the porous medium is 60-mesh acid-washed quartz sand, the flow meter 220 obtains a vertical seepage flow rate of 363 mL / min, and the permeability k is calculated to be 1344 mD by formula 1.

[0073] The data obtained through Examples 2-7 are shown in Table 1:

[0074] Table 1 Data Table for Examples 2-7

[0075]

[0076] The obtained data can be used to design buffer zones for areas with leakage risks. For example, based on the risk of a 1134 mL / min leakage of 92-octane gasoline stored in an oil depot tank, and using an indoor experimental model, calculations were performed using Equation 1. The permeability was set at 4200 mD, the height at 30 cm, and the calculated cross-sectional area sufficient for the leak to pass through was >314 cm². 2 This provides theoretical and data support for constructing porous media isolation zones around the prevention and control of leaks of different oil products.

[0077] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A porous media evaluation device for controlling oil leakage, characterized in that, include: An oil draining and storage tank and a reaction tank, wherein the oil draining and storage tank and the reaction tank are detachably connected; The top of the oil storage tank is provided with an oil inlet, and the bottom of the reaction tank is provided with an oil outlet. A flow meter is installed at the oil outlet. The bottom of the oil drain storage tank is equipped with an oil drain switch panel; The reaction vessel has a reaction channel for containing porous media, and multiple differential pressure gauges are embedded in the inner wall of the reaction vessel.

2. The apparatus according to claim 1, characterized in that, It also includes an oil spill collection tank, the top of which has an oil spill outlet, and the oil spill collection tank is connected to the inside of the oil spill storage tank through the oil spill outlet.

3. The apparatus according to claim 1, characterized in that, The reaction vessel is equipped with a limiting ring, which is fixedly connected to the inner wall of the reaction vessel to support the porous medium.

4. The apparatus according to claim 3, characterized in that, A filter screen is also provided between the porous medium and the limiting ring.

5. The apparatus according to claim 1, characterized in that, The bottom of the reaction tank is provided with a funnel-shaped oil drain and collection trough, and the output end of the oil drain and collection trough is connected to the oil outlet.

6. The porous media evaluation device for controlling oil leakage according to claim 5, characterized in that, A filter membrane is installed at the output end of the oil drain and collection tank.

7. The apparatus according to claim 1, characterized in that, The oil drain switch panel includes a panel body, the panel body has a cross-shaped oil drain groove, and the panel body is provided with a cover adapted to the cross-shaped oil drain groove. The cover is slidably connected to the inner wall of the oil drain storage tank.

8. The apparatus according to claim 7, characterized in that, The outer wall of the cover is circumferentially covered with a sealing ring.

9. A method for evaluating porous media to control oil leakage, characterized in that, Includes the following steps: S1. Determine the type of finished oil used in the experiment, and use a viscometer to measure the viscosity of the finished oil, and determine the type of porous medium used in the experiment, as well as the length and cross-sectional area of ​​the porous medium; S2. Place the porous medium into the reaction channel, set the flow rate to 1mL / min-600mL / min, pump the finished oil into the drain storage tank, open the drain switch panel, record the drain flow rate through the flow meter, and record the differential pressure through the differential pressure gauge; S3. Based on the oil discharge flow rate, calculate the vertical permeability of the finished oil at the specified flow rate, using the formula shown in Equation 1: Where: K - permeability, D; Q - oil drain velocity, cm 3 / s; μ - viscosity of finished oil, mPa·s; L - length of porous media, cm; A - cross-sectional area of ​​porous media, cm² 2 Δp - Pressure difference of finished oil passing through porous media, MPa.

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