CN108152186B - Experimental device for simulating fracture network two-phase flow flowing under coupling action in complex underground environment - Google Patents
Experimental device for simulating fracture network two-phase flow flowing under coupling action in complex underground environment Download PDFInfo
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- 230000005514 two-phase flow Effects 0.000 title claims abstract description 44
- 230000001808 coupling effect Effects 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 162
- 239000011435 rock Substances 0.000 claims abstract description 90
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 30
- 238000005485 electric heating Methods 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 103
- 238000002347 injection Methods 0.000 claims description 48
- 239000007924 injection Substances 0.000 claims description 48
- 238000002474 experimental method Methods 0.000 claims description 30
- 238000005086 pumping Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an experimental device for simulating two-phase flow of a fracture network under the coupling action in a complex underground environment, and belongs to the field of experimental devices for simulating two-phase fluid. The device comprises a set of rock fracture network model, an electric heating plate, a set of horizontal placing table, a set of pressurizing device, a set of infrared thermometer, a set of high-definition camera, two sets of peristaltic pumps, two sets of flow supply boxes and an oil-water recovery box. The rock fracture network model is placed on the electric heating plate, the electric heating plate can simulate the change of the environment temperature of oil at different underground depths by changing the temperature, a temperature field can be simulated, the pressurizing devices are installed on two sides of the rock fracture network model, the ground pressure generated by surrounding rocks during the seepage of the underground oil can be simulated by pressurizing, a pressure field can be simulated, and the change of the ground pressure value at different underground depths can be simulated by changing the pressure value of the pressurizing devices. The influence of ground pressure and temperature on two-phase flow in an underground complex environment can be simulated, and the coupling effect of a temperature field, a pressure field and a flow field is considered.
Description
Technical Field
The invention relates to the field of two-phase fluid simulation experiment devices, in particular to a method for detecting and researching the flow characteristics of oil-water two-phase flow of a rock fracture network under the coupling action of a temperature field, a flow field and a pressure field in a simulated complex underground environment.
Background
In recent years, incompatible two-phase flows have attracted attention in a growing number of technical fields, such as oil production, nuclear power, CO2 storage, medicine, etc. The liquid-liquid two-phase flow as one type of the liquid-liquid two-phase flow is relatively weak to the research on gas-liquid two-phase flow, solid-liquid two-phase flow and gas-solid two-phase flow, but the application of the liquid-liquid two-phase flow in practice is very important, and particularly in the field of oil exploitation, the oil-water two-phase flow is more and more paid attention to by people. Today, with rapid development of economy, the demand of various countries for oil is continuously increasing, and how to more efficiently extract oil becomes a problem to be considered by people. Because the oil pressure is continuously reduced due to continuous exploitation of the existing oil, the oil cannot be ejected out through self pressure, the oil quantity of exploitation is often required to be improved by pressing water into an oil well, the water content in the oil is higher and higher along with the prolonging of the exploitation time, the oil-water two-phase flow is often the condition in the exploitation process, rock cracks existing in the oil provide a channel for seepage, and therefore the research on the oil-water two-phase flow has important significance for the exploitation of the oil.
Most of petroleum is usually concentrated in an underground shallow layer or a middle-deep layer, when oil-water two phases seep in a fracture of an underground rock mass, the underground temperature of the surrounding environment is usually higher than the above-ground temperature, and the ground pressure caused by rocks exists around the oil-water two phases, the actual underground environment is usually more complex than the surrounding environment during the experiment, but the existing two-phase flow simulation experiment devices are simple devices for simply realizing two-phase contact flow, the two-phase flow experiment is only carried out in an indoor environment, the temperature of the indoor experiment is usually far lower than the temperature of the oil-underground environment, and the existing device cannot simulate the ground pressure caused by the surrounding rocks, so the experiment carried out without considering the influence of underground environment factors is not accurate enough, and the real two-phase flow experiment rule cannot be obtained. Because the existing device can not simulate the real flowing state of oil-water two phases in the rock mass fracture in the actual production process under the complex underground environment, it is necessary to design a device which can visually observe the flowing rule of oil-water in the fracture at different flow rates and different injection ports and discharge ports under the conditions of simulated earth pressure and underground temperature.
Chinese patent publication No. CN107084914A discloses a fracture network two-phase flow experimental device and method, but the device only considers controlling the inlet and outlet of fluid through pressure, but does not consider the influence of other factors on the two-phase flow law, and the influence of temperature and ground pressure on oil-water two-phase flow is also an important influence factor.
Disclosure of Invention
Due to the problems in the background art, the invention aims to provide a device for simulating the flow law of two-phase flow in a research fracture network under the coupling action of a temperature field, a pressure field and a flow field.
An experimental device for simulating two-phase flow of a fracture network under the coupling action in a complex underground environment comprises a horizontal placing table, an electric heating plate, a rock fracture network model, a pressurizing device, a flowmeter, a T-shaped three-way conversion head, a transparent hose, a valve for controlling water to enter the T-shaped three-way conversion head, a valve for controlling oil to enter the T-shaped three-way conversion head, valves for controlling the number of water injection ports, valves for controlling the number of oil injection ports, valves, water flow dividers, oil flow dividers, fluid flow dividers, a water pumping peristaltic pump, an oil pumping peristaltic pump, a water supply tank, an oil-water recovery tank, a high-definition camera and an infrared thermometer.
The rock fracture network model is made of a rock plate and an organic glass plate, the rock plate is arranged on the lower layer of the rock fracture network model, and the organic glass plate is arranged on the upper layer of the rock fracture network model. A two-dimensional fracture network is carved in the rock plate and is bonded with the organic glass plate through bonding glue, and outlet conversion heads are arranged at fracture injection ports and fracture outlet ports of the rock fracture network model and are used for connecting the fracture inlet and the fracture outlet ports with the transparent hose. The rock fracture network model is placed on the electric heating plate, the electric heating plate can simulate the change of the environment temperature of oil at different underground depths through changing the temperature, a temperature field can be simulated, and the temperature of different positions of the rock fracture network model is measured through the infrared thermometer when fluid flows in the fractures of the rock fracture network model. The rock fracture network model and the electric heating plate are placed on the horizontal placing table so as to ensure that the rock fracture network model is always kept horizontal during the experiment.
The pressurizing devices are installed on two sides of the rock fracture network model, the ground pressure generated by surrounding rocks during underground petroleum seepage is simulated through pressurization, a pressure field can be simulated, and the change of the ground pressure values at different depths can be simulated by changing the pressure value of the pressurizing devices.
The rock fracture network model discharge port is connected with the transparent hose through the outlet conversion head, and the transparent hose is provided with a valve and a flowmeter, and the flowmeter is responsible for measuring the flow of liquid discharged from the transparent hose at each discharge port. The other side of the transparent hose is connected with a fluid diverter, one end of the fluid diverter is connected with the transparent hose at the discharge port, the other end of the fluid diverter is connected with the other transparent hose, so that the fluid is discharged through one transparent hose, the other transparent hose is connected with an oil-water recovery tank, and the discharged fluid flows into the oil-water recovery tank through the transparent hose.
The oil supply flow box is filled with oil and is connected with the oil pumping peristaltic pump, the water supply flow box is filled with water and is connected with the water pumping peristaltic pump, and the flow rate of the water pumping peristaltic pump and the oil pumping peristaltic pump can be adjusted to control the flow of the water and the oil.
The rock fracture network model may be provided with a plurality of injection ports, one of which is taken as an example. The transparent hoses are connected with the filling ports through outlet conversion heads, flow meters are installed on the transparent hoses and used for measuring the flow of fluid entering the filling ports, the transparent hoses are connected with the other two hoses through T-shaped three-way conversion heads, the two transparent hoses are divided into a left transparent hose and a right transparent hose according to directions, a valve for controlling water to enter the T-shaped three-way conversion heads is installed on the left transparent hose close to the T-shaped three-way conversion heads, the other side of the left transparent hose is connected with a water splitter, valves for controlling the quantity of the water filling ports are installed on the left transparent hose close to the water splitter, and one end of the water splitter is connected with the left transparent hose and the other side of the water splitter is led out to form a. And similarly, a valve for controlling oil to enter the T-shaped three-way conversion head is arranged at the position, close to the T-shaped three-way conversion head, of the right transparent hose, the other side of the right transparent hose is connected with an oil splitter, valves for controlling the number of oil filling openings are arranged at the position, close to the oil splitter, of the right transparent hose, one end of the oil splitter is connected with the right transparent hose, and the other side of the oil splitter leads out a transparent hose to be connected with an oil pumping peristaltic.
The high-definition camera is arranged on the upper side of the rock fracture network model, and the flowing condition of oil-water phases in the rock fracture network model is recorded in real time through the high-definition camera.
Compared with the prior art, the invention has the following beneficial effects;
1. the influence of ground pressure and temperature on two-phase flow in an underground complex environment can be simulated, and the coupling effect of a temperature field, a pressure field and a flow field is considered.
2. The flow rate of oil and water can be controlled, and the flow change of the injection port and the discharge port can be monitored in real time through the flow meter.
3. The number and the position of the injection ports of the oil and the water can be independently controlled.
Drawings
FIG. 1 is a schematic structural diagram of an experimental device designed by the invention for simulating fracture network two-phase flow under the coupling action in a complex underground environment.
FIG. 2 is a schematic structural diagram of a rock fracture network model in an experimental device.
FIG. 3 is a schematic structural diagram of a T-shaped three-way changing head in the experimental apparatus.
Shown in the figure: 1-horizontally placing a table; 2-electric heating plate; 3-a rock fracture network model; 3 a-a rock plate; 3 b-organic glass plate; 3 c-an outlet switching head; 4-a pressurizing device; 5-a flow meter; 6-T type three-way conversion head; 6 a-transparent hose a; 6 b-transparent hose b; 6 c-transparent hose c; 7 a-a valve for controlling water to enter the T-shaped three-way conversion head; 7 b-a valve for controlling oil to enter the T-shaped three-way conversion head; 8 a-valves to control the number of water injection ports; 8 b-valves to control the number of oil injection ports; 9 a-a water diverter; 9 b-oil flow divider; 9 c-a flow diverter; 10-a water pumping peristaltic pump; 11-oil-pumping peristaltic pump; 12-a water supply tank; 13-oil supply and drainage tank; 14-an oil-water recovery tank; 15-high definition camera; 16-valve.
Detailed Description
The invention is further described with reference to the accompanying drawings.
The invention aims to solve the technical problem of designing a device for researching the flowing rule of two-phase flow in a fracture network under the coupling action of a temperature field, a pressure field and a flow field, wherein the device can simulate the flowing condition of oil-water two-phase in a complex underground environment in a rock fracture in the oil exploitation process. The device can simulate underground temperature and ground pressure, can also simulate the flow law of oil-water two-phase in rock fractures when oil and water are injected at different flow rates and are discharged from different injection ports and different discharge ports, and measures the flow of the different injection ports and the different discharge ports through the flow meter to obtain a proportional relation. The influence of the coupling effect of a temperature field, a pressure field and a flow field on the oil-water two-phase flow is comprehensively considered.
FIG. 1 is a schematic structural diagram of an experimental device designed by the invention for simulating fracture network two-phase flow under the coupling action in a complex underground environment.
An experimental device for simulating two-phase flow of a fracture network under the coupling action in a complex underground environment comprises a horizontal placing table 1, an electric heating plate 2, a rock fracture network model 3, a pressurizing device 4, a flowmeter 5, a T-shaped three-way conversion head 6, a valve 7a for controlling water to enter the T-shaped three-way conversion head, a valve 7b for controlling oil to enter the T-shaped three-way conversion head, a valve 8a for controlling the number of water injection ports, a valve 8b for controlling the number of oil injection ports, a water flow diverter 9a, an oil flow diverter 9b, a fluid flow diverter 9c, a water pumping peristaltic pump 10, an oil pumping peristaltic pump 11, a water flow supply box 12, an oil flow supply box 13, an oil water recovery box 14, a high-definition camera 15 and a valve 16, wherein a solid line is a transparent hose in the figure. The electric heating plate 2 is arranged on the horizontal placing table 1 to ensure the level of the whole experimental device; the rock fracture network model 3 is arranged on the electric hot plate 2, the pressurizing devices 4 are arranged on two sides of the rock fracture network model 3, a transparent hose connected from an injection port of the rock fracture network model 3 is connected with a T-shaped three-way conversion head 6, a flowmeter 5 is arranged on the transparent hose, the other two joints of the T-shaped three-way conversion head 6 are respectively connected with two transparent hoses, the two transparent hoses are respectively connected with one sides of a water diverter 9a and an oil diverter 9b, and a valve 7a for controlling water to enter the T-shaped three-way conversion head and a valve 8a for controlling the quantity of water injection ports are sequentially arranged on the transparent hose connected with one side of the water diverter 9 a; a valve 7b for controlling oil to enter the T-shaped three-way conversion head and a valve 8b for controlling the number of oil filling ports are sequentially arranged on a transparent hose connected with one side of an oil splitter 9b, the other side of the water splitter 9a is connected with a water pumping peristaltic pump 10 and is connected with a water supply tank 12, and the other side of the oil splitter 9b is connected with an oil pumping peristaltic pump 11 and is connected with an oil supply tank 13. A transparent hose connected with a discharge port of the rock fracture network model 3 is connected with a fluid flow divider 9c, a valve 16 and a flow meter 5 are installed on the transparent hose, the other side of the fluid flow divider 9c is connected with an oil-water recovery tank 14, a high-definition camera 15 is arranged right above the rock fracture network model 3, and the high-definition camera 15 is used for shooting and recording the flowing condition of liquid in fractures of the rock fracture network model.
FIG. 2 is a schematic structural diagram of a rock fracture network model in an experimental device. The rock fracture network model 3 comprises a rock plate 3a, an organic glass plate 3b, an outlet conversion head 3c, a flowmeter 5 and a valve 16. During the experiment, the cracks are carved on the rock plate 3a, and the width, length, depth and distribution of the cracks are automatically designed according to the needs of the experiment; the width and the depth of the cracks at the crack injection port and the crack discharge port are larger than those of the cracks in the rock crack network model 3 so as to ensure that the entering liquid flows in the full fracture surface, the rock plate 3a is arranged at the lower layer of the rock crack network model 3, the organic glass plate 3b is arranged at the upper layer of the rock crack network model 3, and the organic glass plate 3b is bonded with the rock plate 3a through bonding glue, wherein only one type of crack distribution is given in the example of the figure 2. The outlet conversion head 3c is installed at an inlet and an outlet of the rock fracture network model 3, one end of the outlet conversion head 3c is square and is connected with the rock fracture network model 3, the other end of the outlet conversion head 3c is round and is connected with the transparent hose, and the rock fracture network model 3 is connected with the transparent hose through the outlet conversion head 3 c. The pressurizing devices 4 are arranged on two sides of the rock fracture network model 3 and are used for simulating ground pressure and a pressure field in an experiment; the valve 16 and the flow meter 5 are arranged on a transparent hose connected to the discharge opening.
FIG. 3 is a schematic structural diagram of a T-shaped three-way changing head in the experimental apparatus. Three channels of the T-shaped three-way conversion head 6 are respectively connected with a transparent hose a6a, a transparent hose b6b and a transparent hose c6c, and are used for controlling water to enter a valve 7a of the T-shaped three-way conversion head and controlling oil to enter a valve 7b of the T-shaped three-way conversion head. The transparent hose a6a is a water-flowing hose, the transparent hose b6b is an oil-flowing hose, and the transparent hose c6c is a hose through which an oil-water mixed fluid enters the fracture model.
In the existing experimental device, oil and water are injected from the same injection port or different injection ports, and the injection ports of the oil and the water cannot be independently controlled.
As shown in fig. 3, the specific operation is that when water flows into the transparent hose a from the water diverter 9a, when oil flows into the transparent hose b from the oil diverter 9b, the valve 7a for controlling water to enter the T-shaped three-way conversion head and the valve 7b for controlling oil to enter the T-shaped three-way conversion head are closed, if the flow rates of water and oil are different, when the flow rate of water is faster than that of oil, water flows into the valve 7a for controlling water to enter the T-shaped three-way conversion head first, at this time, the valve 7a for controlling water to enter the T-shaped three-way conversion head is opened, the valve 7b for controlling oil to enter the T-shaped three-way conversion head is kept closed, water flows into the transparent hose c through the T-shaped three-way conversion head 6, when oil with a slow flow rate flows into the valve 7b for controlling oil to enter the T-shaped three-way conversion head, the valve 7b for controlling oil to flow into the transparent hose c through the T-shaped three-way conversion head 6, the valve 7a for controlling water to enter the T-shaped three-way conversion head and the valve 7b for controlling oil to enter the T-shaped three-way conversion head are always kept in an open state, and at the moment, oil and water phases simultaneously flow into the transparent hose c from the T-shaped three-way conversion head 6.
The valve 7a for controlling water to enter the T-shaped three-way conversion head and the valve 7b for controlling oil to enter the T-shaped three-way conversion head have the functions of preventing oil and water from flowing into a hose of an opposite party through the T-shaped three-way conversion head 6, if the water does not enter the valve 7a for controlling the T-shaped three-way conversion head and the valve 7b for controlling the oil to enter the T-shaped three-way conversion head, the water flows to the T-shaped three-way conversion head 6 firstly if the speed of the water is higher than that of the oil, at the moment, the water flows into the transparent hose b and the transparent hose c respectively through the T-shaped three-way conversion head 6, the oil in the transparent hose b can be mixed with the water flowing into the transparent hose b, and the experimental result can not reflect the real.
After the experimental device is connected, the electric heating plate 2 and the pressurizing device 4 are adjusted according to the underground environment to be simulated, the temperature of the electric heating plate 2 is adjusted to be the underground temperature to be simulated, and the pressurizing device 4 is adjusted to be the ground pressure to be simulated. The number of water and oil inlet ports is determined by opening and closing the valve 8a for controlling the number of water inlet ports and the valve 8b for controlling the number of oil inlet ports, and the number of discharge ports is determined by opening and closing the valve 16. The flow rates of the oil-pumping peristaltic pump 11 and the water-pumping peristaltic pump 10 are respectively adjusted according to the oil flow rate and the water flow rate required by the experiment. The water supply tank 12 injects water into one end of the water diverter 9a through the pumping peristaltic pump 10, the oil supply tank 13 injects oil into one end of the oil diverter 9b through the pumping peristaltic pump 11, the other ends of the water diverter 9a and the oil diverter 9b are respectively connected with five transparent hoses, the water and the oil respectively flow into the transparent hoses a and the transparent hoses b through the opened valves 8a and 8b for controlling the number of water injection ports and the opened valves 8b for controlling the number of oil injection ports from the water diverter 9a and the oil diverter 9b, the other ends of the transparent hoses a and the transparent hoses b are respectively provided with the valves 7a and 7b for controlling the water to enter the T-shaped three-way conversion head and the valves 7a and 7b for controlling the oil to enter the T-shaped three-way conversion head, and the valves 7a and 7b for controlling the water to enter the T-shaped three-way conversion head are closed, and the water and the oil are respectively injected into the transparent hoses a, b and the oil, The flowing condition in the transparent hose b, which transparent hose a or the fluid in the transparent hose b flows to the valve 7a of the T-shaped three-way conversion head or the control oil enters the valve 7b of the T-shaped three-way conversion head, when the control water on the transparent hose a or the fluid in the transparent hose b flows into the valve 7a of the T-shaped three-way conversion head or the control oil enters the valve 7b of the T-shaped three-way conversion head, the control water and the control oil enter the valve 7b of the T-shaped three-way conversion head through the opened valve 7a of the T-shaped three-way conversion head, so that the water and the oil flow into the transparent hose c through the T-shaped three-way conversion head 6 and are injected into the rock fracture network model 3 through the outlet conversion head 3c, the flowing condition of the oil-water two phases in the rock fracture network model 3 is observed, the recording is carried out through the high-definition camera 15, the temperature of the rock, when the fluid flows over the entire crack, the fluid flows out of the transparent hose opened by the valve 16, and is collected by the fluid diverter 9c and flows into the oil-water recovery tank 14. And measuring the flow rate of different injection ports when the different injection ports are injected into the rock fracture network model 3 through the flow meters 5 at the injection ports in the experiment, obtaining the flow rate proportion of fluid injected by the different injection ports through calculation, measuring the discharged flow rate through the flow meters 5 at the discharge ports, and obtaining the flow rate proportion of fluid discharged from the rock fracture network model by the different discharge ports through calculation.
The experimental process was carried out as follows:
step 1, a rock fracture network model 3 is manufactured, and the gap width, the gap length, the gap depth and the gap distribution of an experimental fracture are determined.
And 2, pre-debugging the experimental device for the fracture network two-phase flow.
And 3, respectively adjusting the temperature of the electric heating plate 2, the pressurization value of the pressurization device 4, and the flow rates of the pumping peristaltic pump 10 and the oil pumping peristaltic pump 11 to the requirements of the experiment, and adjusting the opening and closing of a valve 8a for controlling the number of water injection ports, a valve 8b for controlling the number of oil injection ports and a valve 16 to control the number and the positions of oil and water injection ports and the number and the positions of discharge ports.
And 4, carrying out an oil-water two-phase flow experiment according to the experiment process in the step 3.
And 5, recording the flow in the flowmeter 5 and obtaining the proportional relation of the flow.
And 6, repeating the steps 2 to 5, adjusting the required experiment variable values, and performing multiple groups of experiments.
And 7, after the experiment is completed, arranging the experimental device so as to be used in the next experiment.
The temperature of the fluid is normal temperature when the fluid enters the rock fracture network model, and after the fluid enters the rock fracture network model, the temperature of the fluid is gradually increased in the two-phase flow process due to the high temperature of the rock fracture network model, and the flow rules of the discharge port and the injection port are possibly different, so that the temperature is necessarily considered, and the infrared thermometer is used for measuring the temperature of the rock fracture network model to see whether the temperature of the model is changed in the two-phase flow process. After the two sides of the rock fracture network model are pressurized, the flowing rule of oil-water phases in the rock fracture network model can be changed. Therefore, it is necessary to simulate the temperature and the ground pressure in the underground environment and consider the influence of the ground pressure on the oil-water two-phase flow law. Therefore, the device can simulate the temperature and the ground pressure of the underground environment, the injection flow rate of different oil and water, the injection ports and the discharge ports of different oil and water, and the influence of various factors on the seepage rule of oil-water two phases in the rock fracture network model can be considered. In conclusion, the experimental device for simulating the two-phase flow of the fracture network under the coupling action in the complex underground environment has high practical value.
Claims (7)
1. An experimental device for simulating fracture network two-phase flow flowing under the coupling action in a complex underground environment is characterized in that: the device comprises a horizontal placing table (1), an electric heating plate (2), a rock fracture network model (3), a pressurizing device (4), a flowmeter (5), a T-shaped three-way conversion head (6), a valve (7a) for controlling water to enter the T-shaped three-way conversion head, a valve (7b) for controlling oil to enter the T-shaped three-way conversion head, valves (8a) for controlling the number of water injection ports, valves (8b) for controlling the number of oil injection ports, a water flow divider (9a), an oil flow divider (9b), a fluid flow divider (9c), a water pumping peristaltic pump (10), an oil pumping peristaltic pump (11), a water flow supply box (12), an oil flow supply box (13), an oil water recovery box (14), a high-definition camera (15) and a valve (16); the electric heating plate (2) is arranged on the horizontal placing table (1) to ensure the level of the whole experimental device; the rock fracture network model (3) is arranged on the electric hot plate (2), the pressurizing devices (4) are arranged on two sides of the rock fracture network model (3), a transparent hose connected from an injection port of the rock fracture network model (3) is connected with a T-shaped three-way conversion head (6), a flowmeter (5) is arranged on the transparent hose, the other two joints of the T-shaped three-way conversion head (6) are respectively connected with two transparent hoses, the two transparent hoses are respectively connected with one sides of a water flow divider (9a) and an oil flow divider (9b), and a valve (7a) for controlling water to enter the T-shaped three-way conversion head and a valve (8a) for controlling the number of water injection ports are sequentially arranged on the transparent hose connected with one side of a water flow divider (9 a); a valve (7b) for controlling oil to enter the T-shaped three-way conversion head and valves (8b) for controlling the number of oil injection ports are sequentially installed on a transparent hose connected with one side of an oil distributor (9b), the other side of a water distributor (9a) is connected with a water pumping peristaltic pump (10) and connected to a water supply tank (12), and the other side of the oil distributor (9b) is connected with an oil pumping peristaltic pump (11) and connected to an oil supply tank (13); the transparent hose that rock fracture network model (3) discharge port was connect out links to each other with fluid shunt (9c) to install valve (16), flowmeter (5) on the transparent hose, fluid shunt (9c) opposite side links to each other with profit recovery box (14), has arranged high definition camera (15) directly over rock fracture network model (3), and high definition camera (15) are used for shooting the mobile condition of liquid in the record fracture.
2. The experimental device for simulating two-phase flow of a fracture network under the coupling effect in the complex underground environment according to claim 1, wherein: the rock fracture network model (3) comprises a rock plate (3a), an organic glass plate (3b), an outlet conversion head (3c) and a valve (16); during the experiment, the cracks are carved on the rock plate (3a), and the width, length, depth and distribution of the cracks are automatically designed according to the needs of the experiment; the width and the depth of the cracks at the crack injection port and the crack discharge port are larger than those in the rock crack network model (3) so as to ensure that the entering liquid flows in the full section of the crack, the rock plate (3a) is arranged at the lower layer of the rock crack network model (3), the organic glass plate (3b) is arranged at the upper layer of the rock crack network model (3), and the organic glass plate (3b) is bonded with the rock plate (3a) through bonding glue; the outlet conversion head (3c) is arranged at an inlet and an outlet of the rock fracture network model (3), one end of the outlet conversion head (3c) is square and is connected with the rock fracture network model (3), the other end of the outlet conversion head (3c) is round and is connected with the transparent hose, and the rock fracture network model (3) is connected with the transparent hose through the outlet conversion head (3 c); the valve (16) and the flow meter (5) are arranged on a transparent hose connected with the discharge opening.
3. The experimental device for simulating two-phase flow of a fracture network under the coupling effect in the complex underground environment according to claim 1, wherein: three channels of the T-shaped three-way conversion head (6) are respectively connected with a transparent hose a (6a), a transparent hose b (6b) and a transparent hose c (6c), water is controlled to enter a valve (7a) of the T-shaped three-way conversion head, and oil is controlled to enter a valve (7b) of the T-shaped three-way conversion head; the transparent hose a (6a) is a hose through which water flows, the transparent hose b (6b) is a hose through which oil flows, and the transparent hose c (6c) is a hose through which an oil-water mixed fluid enters the fracture model.
4. The experimental device for simulating two-phase flow of a fracture network under the coupling effect in the complex underground environment according to claim 1, wherein:
the specific operation is that when water flows into the transparent hose a from the water diverter (9a), when oil flows into the transparent hose b from the oil diverter (9b), the valve (7a) for controlling water to enter the T-shaped three-way conversion head and the valve (7b) for controlling oil to enter the T-shaped three-way conversion head are closed, if the flow rates of the water and the oil are different, when the flow rate of the water is faster than that of the oil, the water flows to the valve (7a) for controlling water to enter the T-shaped three-way conversion head, at the moment, the valve (7a) for controlling water to enter the T-shaped three-way conversion head is opened, the valve (7b) for controlling oil to enter the T-shaped three-way conversion head is kept closed, the water flows into the transparent hose c through the T-shaped three-way conversion head (6), when the flow rate of the oil flows to the valve (7b) for controlling oil to enter the T-shaped three-way conversion head, the valve (7b) for controlling oil, and oil flows into the transparent hose c through the T-shaped three-way conversion head (6), a valve (7a) for controlling water to enter the T-shaped three-way conversion head and a valve (7b) for controlling oil to enter the T-shaped three-way conversion head are always kept in an open state, and at the moment, oil and water phases simultaneously flow into the transparent hose c from the T-shaped three-way conversion head (6).
5. The experimental device for simulating two-phase flow of a fracture network under the coupling effect in the complex underground environment according to claim 1, wherein:
the valve (7a) for controlling water to enter the T-shaped three-way conversion head and the valve (7b) for controlling oil to enter the T-shaped three-way conversion head have the functions of preventing oil and water from flowing into a hose of the opposite party through the T-shaped three-way conversion head (6), if the valve (7a) for controlling water to enter the T-shaped three-way conversion head and the valve (7b) for controlling oil to enter the T-shaped three-way conversion head are not used, water flows to the T-shaped three-way conversion head (6) firstly if the speed of the water is higher than that of the oil, then the water flows into the transparent hose b and the transparent hose c respectively through the T-shaped three-way conversion head (6), and the oil in the transparent hose b can be mixed with the water flowing into the transparent hose b, so that the experimental result can not reflect the real rule.
6. The experimental device for simulating two-phase flow of a fracture network under the coupling effect in the complex underground environment according to claim 1, wherein:
after the experimental device is connected, the electric heating plate (2) and the pressurizing device (4) are adjusted according to the underground environment to be simulated, the temperature of the electric heating plate (2) is adjusted to be the underground temperature to be simulated, and the pressurizing device (4) is adjusted to be the ground pressure to be simulated; according to the experiment, the number of water and oil injection ports is determined by opening and closing a valve (8a) for controlling the number of water injection ports and a valve (8b) for controlling the number of oil injection ports, and the number of discharge ports is determined by opening and closing a valve (16); respectively adjusting the flow rates of the oil-pumping peristaltic pump (11) and the water-pumping peristaltic pump (10) according to the oil flow rate and the water flow rate required by the experiment; a water supply tank (12) injects water into one end of a water diverter (9a) through a water pumping peristaltic pump (10), an oil supply tank (13) injects oil into one end of an oil diverter (9b) through an oil pumping peristaltic pump (11), the other ends of the water diverter (9a) and the oil diverter (9b) are respectively connected with five transparent hoses, the water and the oil respectively flow into the transparent hoses a and the transparent hoses b through the water diverter (9a) and the oil diverter (9b) through opened valves (8a) for controlling the number of water injection ports and opened valves (8b) for controlling the number of oil injection ports, the valves (7a) for controlling the water to enter the T-shaped three-way conversion head and the valves (7b) for controlling the oil to enter the T-shaped three-way conversion head are respectively arranged at the other ends of the transparent hoses a and the transparent hoses b, all the valves (7a) for controlling the water to enter the T-shaped three-way conversion head and the valves (7b) for controlling the oil to enter the T-shaped three-way conversion head, according to the flowing conditions of water and oil in the transparent hoses a and b, when fluid in which transparent hose a or transparent hose b quickly flows to a valve (7a) for controlling water to enter the T-shaped three-way conversion head or a valve (7b) for controlling oil to enter the T-shaped three-way conversion head, the valve (7a) for controlling the T-shaped three-way conversion head on the transparent hose a or the valve (7b) for controlling oil to enter the T-shaped three-way conversion head is opened, the opened control water enters the valve (7a) for controlling the T-shaped three-way conversion head and the opened control oil enters the valve (7b) for controlling the T-shaped three-way conversion head, so that the water and the oil flow into the transparent hose c through the T-shaped three-way conversion head (6) and are injected into the rock fracture network model (3) through the outlet conversion head (3c), the flowing conditions of the oil-water phase and the oil phase in the rock fracture network model (3) are observed and, the temperature of the rock fracture network model (3) is measured by an infrared thermometer in the seepage process, when the whole fracture is filled with fluid, the fluid flows out of a transparent hose opened by a valve (16), and is collected by a fluid flow divider (9c) and flows into an oil-water recovery tank (14); and measuring the flow rate when different injection ports are injected into the rock fracture network model (3) through the flow meters (5) at the injection ports in the experiment, obtaining the flow rate proportion of the fluid injected by the different injection ports through calculation, measuring the discharged flow rate through the flow meters (5) at the discharge ports, and obtaining the flow rate proportion of the fluid discharged from the rock fracture network model by the different discharge ports through calculation.
7. The experimental device for simulating two-phase flow of a fracture network under the coupling effect in the complex underground environment according to claim 1, wherein:
the experimental process was carried out as follows:
step 1, making a rock fracture network model (3), and determining the width, length, depth and distribution of the fractures of an experimental fracture;
step 2, pre-debugging an experimental device for fracture network two-phase flow;
step 3, respectively adjusting the temperature of the electric heating plate (2), the pressurization value of the pressurization device (4), the flow rates of the pumping peristaltic pump (10) and the oil pumping peristaltic pump (11) to the requirements of the experiment, and adjusting the opening and closing of a valve (8a) for controlling the number of water injection ports, a valve (8b) for controlling the number of oil injection ports and a valve (16) to control the number and the positions of oil and water injection ports and the number and the positions of discharge ports;
step 4, performing an oil-water two-phase flow experiment according to the experiment process in the step 3;
step 5, recording the flow in the flowmeter (5) and obtaining the proportional relation of the flow;
step 6, repeating the steps 2 to 5, adjusting the magnitude of the required experiment variable value, and carrying out a plurality of groups of experiments;
and 7, after the experiment is completed, arranging the experimental device so as to be used in the next experiment.
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| CN111829934B (en) * | 2020-07-21 | 2021-03-09 | 中国矿业大学 | Fracture network shear-two-phase flow test device and test method |
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