Horizontal well shaft oil-water two-phase upwelling flow pattern and pressure simulation experiment device

Abstract

The utility model discloses a horizontal well shaft oil-water two-phase upwelling flow pattern and pressure simulation experiment device which comprises a two-phase storage unit, the two-phase storage unit is connected with a mixer through a conveying mechanism, the conveying mechanism is connected with a regulation and control monitoring mechanism, the regulation and control monitoring mechanism is connected with a measurement and control system, and the mixer is connected with an experiment loop. The experimental loop is connected with a monitoring unit, the monitoring unit is connected with a measurement and control system, the experimental loop is further connected with a separation tank, and one side, far away from the experimental loop, of the separation tank is connected with a two-phase storage unit. According to the utility model, each simulation pipe section is continuous, the applicable pipe oblique angle range is large, and the condition of continuously changing hole oblique angles of 0-90 degrees of a horizontal well can be met; each simulation pipe section of the experiment is a transparent organic glass pipe, so that the visualization of an oil-water two-phase upwelling flow pattern can be realized; and the pressure sensor can realize real-time recording of the pressure change of each simulation pipe section.

Description

Technical Field

[0001] This utility model belongs to the technical field of multiphase flow simulation experimental device for oil and gas field development wellbore, specifically involving a simulation experimental device for the upward flow pattern and pressure of oil and water two-phase flow in horizontal wellbore. Background Technology

[0002] In oilfield development, some reservoirs maintain a reservoir pressure higher than the saturation pressure for production. The wellbore primarily experiences oil-water two-phase flow. Because crude oil density is lower than formation water density, water phase slippage occurs during the upward flow, leading to water accumulation at the bottom of the wellbore. Horizontal wells, due to their continuous inclination angles, experience even more severe water accumulation, resulting in increased lift pressure drop and premature well shutdown. Accurate calculation of the pressure drop due to wellbore slippage can extend the well's self-flowing period. Precise prediction of the oil-water two-phase flow pattern is fundamental to calculating liquid holdup, friction, and pressure drop. The presence of water phase slippage during the upward flow of the oil-water two-phase flow makes liquid holdup calculations more complex; therefore, it is necessary to clearly understand the oil-water two-phase upward flow pattern.

[0003] Currently, there are generally two methods for obtaining downhole fluid parameters: direct testing and model prediction. Because horizontal wells have a more complex structure than vertical wells, including inclined and horizontal sections, it is difficult to run electronic pressure gauges into sections with inclination angles below 40°, making it impossible to directly measure flow parameters in the lower part of horizontal wells. Furthermore, when using model prediction to forecast downhole flow parameters, existing flow pattern prediction methods are inaccurate due to the wide distribution range of inclination angles (0-90°) in horizontal wells and the varied flow patterns of oil and water at different angles. Moreover, the experimental studies on flow pattern diagrams conducted by various researchers involve a narrow angle range, focusing on single vertical, inclined, or horizontal pipes, thus having a limited applicable pipe inclination angle range and failing to meet the conditions for continuously varying inclination angles (0-90°) in horizontal wells. Utility Model Content

[0004] The purpose of this invention is to provide an experimental device for simulating the flow pattern and pressure of two-phase oil-water flow in horizontal wells, which can realize the observation of the flow pattern of two-phase oil-water flow in horizontal wells and the measurement of well pressure drop.

[0005] The technical solution adopted in this utility model is a simulation experimental device for the flow pattern and pressure of two-phase oil-water flow in a horizontal well, including a two-phase storage unit. The two-phase storage unit is connected to a mixer through a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism. The control and monitoring mechanism is connected to a measurement and control system. The mixer is connected to an experimental circuit. The experimental circuit is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank. The side of the separation tank away from the experimental circuit is connected to the two-phase storage unit.

[0006] The features of this utility model also include:

[0007] The two-phase storage unit includes a water tank and an oil tank arranged side by side. Both the water tank and the oil tank are connected to a conveying mechanism. The tops of the water tank and the oil tank are connected to a separation tank through a first connecting pipe and a second connecting pipe, respectively.

[0008] The first connecting pipe is connected to a first switching valve, and the second connecting pipe is connected to a second switching valve. Both the first and second switching valves are connected close to the separator.

[0009] The conveying mechanism includes a water outlet pipe and an oil outlet pipe, which are connected to a water storage tank and an oil storage tank, respectively. Both the water outlet pipe and the oil outlet pipe are connected to a control and monitoring mechanism. The ends of the water outlet pipe and the oil outlet pipe are connected to a collection pipe, which is connected to a mixer.

[0010] The control and monitoring mechanism includes an aqueous phase flow meter and an oil phase flow meter. The aqueous phase flow meter is connected to the water outlet pipe, and the oil phase flow meter is connected to the oil outlet pipe. Both the aqueous phase flow meter and the oil phase flow meter are connected to the monitoring system via cables. The water outlet pipe is connected to a water supply pump and a first regulating valve. The water supply pump and the first regulating valve are located between the water storage tank and the aqueous phase flow meter, with the water supply pump positioned close to the water storage tank. The oil outlet pipe is connected to an oil supply pump and a second regulating valve. The oil supply pump and the second regulating valve are located between the oil storage tank and the oil phase flow meter, with the oil supply pump positioned close to the oil storage tank.

[0011] The monitoring system includes a paperless recorder, which is connected to the water phase flow meter and the oil phase flow meter via cables. The paperless recorder is also connected to a computer via wires and to the monitoring unit via cables.

[0012] The experimental circuit includes a horizontal tube, one end of which is connected to a mixer via a delivery tube. An inclined tube is connected to the end of the horizontal tube away from the delivery tube. A vertical tube is connected to the end of the inclined tube away from the horizontal tube. The end of the vertical tube away from the inclined tube is connected to a separation tank via a connecting tube. The tube bodies of the horizontal tube, inclined tube, and vertical tube are all connected to a monitoring unit.

[0013] The monitoring unit includes a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a fifth pressure sensor, and a sixth pressure sensor arranged sequentially. The first, second, third, fourth, fifth, and sixth pressure sensors are all connected to the paperless recorder via cables. The first and second pressure sensors are connected to both ends of the horizontal tube, with the first pressure sensor positioned close to the conveying tube. The third and fourth pressure sensors are connected to both ends of the inclined tube, with the third pressure sensor positioned close to the horizontal tube. The fifth and sixth pressure sensors are connected to both ends of the vertical tube, with the fifth pressure sensor positioned close to the inclined tube.

[0014] It also includes a high-speed camera, which connects to the computer wirelessly and is positioned close to the vertical tube.

[0015] The horizontal, inclined, and vertical tubes are all made of transparent acrylic glass.

[0016] The beneficial effects of this utility model are:

[0017] This utility model relates to an experimental device for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wells. The simulated pipe sections are continuous, and the applicable pipe inclination angle range is large, which can meet the well inclination angle conditions of continuous variation from 0° to 90° in horizontal wells. The simulated pipe sections are all transparent organic glass pipes, which can realize the visualization of the upward flow pattern of oil-water two-phase flow. The pressure sensor can realize the real-time recording of pressure changes in each simulated pipe section. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the experimental device for simulating the upward flow pattern and pressure of oil and water in a horizontal wellbore according to this utility model.

[0019] In the diagram: 1. Water storage tank, 101. Water outlet pipe, 102. First connecting pipe, 2. Oil storage tank, 201. Oil outlet pipe, 202. Second connecting pipe, 3. Water supply pump, 4. Oil supply pump, 5. First regulating valve, 6. Second regulating valve, 7. Water phase flow meter, 8. Oil phase flow meter, 9. Mixer, 901. Summarizing pipe, 902. Delivery pipe, 10. First pressure sensor, 11. Horizontal pipe, 12. Second pressure sensor, 13. Third pressure sensor, 14. Inclined pipe, 15. Fourth pressure sensor, 16. Fifth pressure sensor, 17. High-speed camera, 18. Vertical pipe, 19. Sixth pressure sensor, 20. Separator, 2001. Connecting pipe, 21. Second switching valve, 22. First switching valve, 23. Paperless recorder, 24. Computer, 25. Cable. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] This invention provides an experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore, such as... Figure 1As shown, the system includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental loop, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental loop is also connected to a separation tank 20, with the side of the separation tank 20 furthest from the experimental loop connected to the two-phase storage unit. The two-phase storage unit stores the experimental media, water and white oil, respectively. The experimental media are conveyed to the mixer 9 via the conveying mechanism for mixing. During the conveying process, the flow rate of the experimental media is adjusted by the control and monitoring mechanism, and the flow data is transmitted to the measurement and control system. This allows for experiments on the two-phase upflow pattern and pressure of oil and water under different oil and water volumes. The experimental media, after being mixed by the mixer 9, flows through the experimental loop, which simulates the vertical, inclined, and horizontal sections of a horizontal well. The monitoring unit monitors the experimental media within the experimental loop, enabling experiments on the two-phase upflow pattern and pressure simulation of a horizontal well. After passing through the experimental loop, the experimental media enters the separation tank 20 for separation and is then returned to the two-phase storage unit.

[0022] Example 1

[0023] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1 As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0024] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both water tank 1 and oil tank 2 are connected to a conveying mechanism. The tops of water tank 1 and oil tank 2 are connected to a separation tank 20 via a first connecting pipe 102 and a second connecting pipe 202, respectively. The water of the experimental medium is stored in water tank 1, and the white oil is stored in oil tank 2. The water and white oil are conveyed to a mixer 9 via the conveying mechanism.

[0025] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separator 20. The water separated from the separator 20 flows back to the water storage tank 1 through the first connecting pipe 102, and the white oil flows back to the oil storage tank 2 through the second connecting pipe 202. The first switching valve 22 and the second switching valve 21 control the flow back to form a complete experimental circuit.

[0026] Example 2

[0027] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1 As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0028] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both the water tank 1 and the oil tank 2 are connected to a conveying mechanism. The tops of the water tank 1 and the oil tank 2 are respectively connected to the separation tank 20 through a first connecting pipe 102 and a second connecting pipe 202.

[0029] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separation tank 20.

[0030] The conveying mechanism includes a water outlet pipe 101 and an oil outlet pipe 201, which are connected to a water storage tank 1 and an oil storage tank 2, respectively. Both the water outlet pipe 101 and the oil outlet pipe 201 are connected to a control and monitoring mechanism. A collection pipe 901 is connected to the ends of the water outlet pipe 101 and the oil outlet pipe 201, and the collection pipe 901 is connected to a mixer 9. Water flowing from the water storage tank 1 enters the collection pipe 901 through the water outlet pipe 101, and white oil flowing from the oil storage tank 2 enters the collection pipe 901 through the oil outlet pipe 201, where they are mixed in the mixer 9.

[0031] Example 3

[0032] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1 As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0033] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both the water tank 1 and the oil tank 2 are connected to a conveying mechanism. The tops of the water tank 1 and the oil tank 2 are respectively connected to the separation tank 20 through a first connecting pipe 102 and a second connecting pipe 202.

[0034] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separation tank 20.

[0035] The conveying mechanism includes a water outlet pipe 101 and an oil outlet pipe 201, which are connected to a water storage tank 1 and an oil storage tank 2, respectively. Both the water outlet pipe 101 and the oil outlet pipe 201 are connected to a control and monitoring mechanism. The ends of the water outlet pipe 101 and the oil outlet pipe 201 are connected to a collection pipe 901, which is connected to a mixer 9.

[0036] The control and monitoring mechanism includes an aqueous phase flow meter 7 and an oil phase flow meter 8. The aqueous phase flow meter 7 is connected to the body of the water outlet pipe 101, and the oil phase flow meter 8 is connected to the body of the oil outlet pipe 201. Both the aqueous phase flow meter 7 and the oil phase flow meter 8 are connected to the monitoring system via cable 25. The body of the water outlet pipe 101 is connected to a water supply pump 3 and a first regulating valve 5. The water supply pump 3 and the first regulating valve 5 are located between the water storage tank 1 and the aqueous phase flow meter 7. The water supply pump 3 is located close to the water storage tank 1. The body of the oil outlet pipe 201 is connected to an oil supply pump 4 and a second regulating valve 6. The oil supply pump 4 and the second regulating valve 6 are located between the oil storage tank 2 and the oil phase flow meter 8. The oil supply pump 4 is located close to the oil storage tank 2. Water pump 3 pumps water out of water outlet pipe 101, and oil pump 4 pumps white oil out of oil outlet pipe 201. Water phase flow meter 7 and oil phase flow meter 8 monitor the water phase flow and oil phase flow respectively, and transmit the monitoring data to the monitoring system. The oil phase and water phase flow can be controlled by the first regulating valve 5 and the second regulating valve 6, so as to carry out the oil-water two-phase upflow flow pattern and pressure experiment under different oil and water volume conditions.

[0037] Example 4

[0038] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1 As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0039] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both the water tank 1 and the oil tank 2 are connected to a conveying mechanism. The tops of the water tank 1 and the oil tank 2 are respectively connected to the separation tank 20 through a first connecting pipe 102 and a second connecting pipe 202.

[0040] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separation tank 20.

[0041] The conveying mechanism includes a water outlet pipe 101 and an oil outlet pipe 201, which are connected to a water storage tank 1 and an oil storage tank 2, respectively. Both the water outlet pipe 101 and the oil outlet pipe 201 are connected to a control and monitoring mechanism. The ends of the water outlet pipe 101 and the oil outlet pipe 201 are connected to a collection pipe 901, which is connected to a mixer 9.

[0042] The control and monitoring mechanism includes an aqueous phase flow meter 7 and an oil phase flow meter 8. The aqueous phase flow meter 7 is connected to the body of the water outlet pipe 101, and the oil phase flow meter 8 is connected to the body of the oil outlet pipe 201. Both the aqueous phase flow meter 7 and the oil phase flow meter 8 are connected to the monitoring system via cable 25. The body of the water outlet pipe 101 is connected to a water supply pump 3 and a first regulating valve 5. The water supply pump 3 and the first regulating valve 5 are located between the water storage tank 1 and the aqueous phase flow meter 7. The water supply pump 3 is located close to the water storage tank 1. The body of the oil outlet pipe 201 is connected to an oil supply pump 4 and a second regulating valve 6. The oil supply pump 4 and the second regulating valve 6 are located between the oil storage tank 2 and the oil phase flow meter 8. The oil supply pump 4 is located close to the oil storage tank 2.

[0043] The monitoring system includes a paperless recorder 23, which is connected to a water phase flow meter 7 and an oil phase flow meter 8 via a cable 25. The paperless recorder 23 is also connected to a computer 24 via a wire and to the monitoring unit via a cable. The water phase flow and oil phase flow are transmitted to the paperless recorder 23 via the water phase flow meter 7 and the oil phase flow meter 8 through the cable, and the data measured by the paperless recorder 23 is finally read by the computer 24.

[0044] Example 5

[0045] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1 As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0046] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both the water tank 1 and the oil tank 2 are connected to a conveying mechanism. The tops of the water tank 1 and the oil tank 2 are respectively connected to the separation tank 20 through a first connecting pipe 102 and a second connecting pipe 202.

[0047] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separation tank 20.

[0048] The conveying mechanism includes a water outlet pipe 101 and an oil outlet pipe 201, which are connected to a water storage tank 1 and an oil storage tank 2, respectively. Both the water outlet pipe 101 and the oil outlet pipe 201 are connected to a control and monitoring mechanism. The ends of the water outlet pipe 101 and the oil outlet pipe 201 are connected to a collection pipe 901, which is connected to a mixer 9.

[0049] The control and monitoring mechanism includes an aqueous phase flow meter 7 and an oil phase flow meter 8. The aqueous phase flow meter 7 is connected to the body of the water outlet pipe 101, and the oil phase flow meter 8 is connected to the body of the oil outlet pipe 201. Both the aqueous phase flow meter 7 and the oil phase flow meter 8 are connected to the monitoring system via cable 25. The body of the water outlet pipe 101 is connected to a water supply pump 3 and a first regulating valve 5. The water supply pump 3 and the first regulating valve 5 are located between the water storage tank 1 and the aqueous phase flow meter 7. The water supply pump 3 is located close to the water storage tank 1. The body of the oil outlet pipe 201 is connected to an oil supply pump 4 and a second regulating valve 6. The oil supply pump 4 and the second regulating valve 6 are located between the oil storage tank 2 and the oil phase flow meter 8. The oil supply pump 4 is located close to the oil storage tank 2.

[0050] The monitoring system includes a paperless recorder 23, which is connected to the water phase flow meter 7 and the oil phase flow meter 8 via a cable 25. The paperless recorder 23 is connected to a computer 24 via a wire, and the paperless recorder 23 is connected to the monitoring unit via a cable.

[0051] The experimental loop includes a horizontal pipe 11. One end of the horizontal pipe 11 is connected to a mixer 9 via a delivery pipe 902. An inclined pipe 14 is connected to the end of the horizontal pipe 11 away from the delivery pipe 902. A vertical pipe 18 is connected to the end of the inclined pipe 14 away from the horizontal pipe 11. The end of the vertical pipe 18 away from the inclined pipe 14 is connected to a separator 20 via a connecting pipe 2001. The pipe bodies of the horizontal pipe 11, inclined pipe 14, and vertical pipe 18 are all connected to a monitoring unit. The angle of the inclined pipe 14 can be adjusted from 0° to 90°, thereby realizing the simulation of the upward flow pattern and pressure of the oil-water two-phase flow in the inclined pipe section under any angle condition. The horizontal pipe 11, inclined pipe 14, and vertical pipe 18 simulate the vertical, inclined, and horizontal sections of a horizontal well, respectively. Water and white oil mixed by the mixer 9 flow sequentially through the horizontal pipe 11, inclined pipe 14, and vertical pipe 18.

[0052] Example 6

[0053] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0054] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both the water tank 1 and the oil tank 2 are connected to a conveying mechanism. The tops of the water tank 1 and the oil tank 2 are respectively connected to the separation tank 20 through a first connecting pipe 102 and a second connecting pipe 202.

[0055] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separation tank 20.

[0056] The conveying mechanism includes a water outlet pipe 101 and an oil outlet pipe 201, which are connected to a water storage tank 1 and an oil storage tank 2, respectively. Both the water outlet pipe 101 and the oil outlet pipe 201 are connected to a control and monitoring mechanism. The ends of the water outlet pipe 101 and the oil outlet pipe 201 are connected to a collection pipe 901, which is connected to a mixer 9.

[0057] The control and monitoring mechanism includes an aqueous phase flow meter 7 and an oil phase flow meter 8. The aqueous phase flow meter 7 is connected to the body of the water outlet pipe 101, and the oil phase flow meter 8 is connected to the body of the oil outlet pipe 201. Both the aqueous phase flow meter 7 and the oil phase flow meter 8 are connected to the monitoring system via cable 25. The body of the water outlet pipe 101 is connected to a water supply pump 3 and a first regulating valve 5. The water supply pump 3 and the first regulating valve 5 are located between the water storage tank 1 and the aqueous phase flow meter 7. The water supply pump 3 is located close to the water storage tank 1. The body of the oil outlet pipe 201 is connected to an oil supply pump 4 and a second regulating valve 6. The oil supply pump 4 and the second regulating valve 6 are located between the oil storage tank 2 and the oil phase flow meter 8. The oil supply pump 4 is located close to the oil storage tank 2.

[0058] The monitoring system includes a paperless recorder 23, which is connected to the water phase flow meter 7 and the oil phase flow meter 8 via a cable 25. The paperless recorder 23 is connected to a computer 24 via a wire, and the paperless recorder 23 is connected to the monitoring unit via a cable.

[0059] The experimental circuit includes a horizontal pipe 11. One end of the horizontal pipe 11 is connected to the mixer 9 via a delivery pipe 902. An inclined pipe 14 is connected to the end of the horizontal pipe 11 away from the delivery pipe 902. A vertical pipe 18 is connected to the end of the inclined pipe 14 away from the horizontal pipe 11. The end of the vertical pipe 18 away from the inclined pipe 14 is connected to the separation tank 20 via a connecting pipe 2001. The pipe bodies of the horizontal pipe 11, the inclined pipe 14, and the vertical pipe 18 are all connected to the monitoring unit.

[0060] The monitoring unit includes a first pressure sensor 10, a second pressure sensor 12, a third pressure sensor 13, a fourth pressure sensor 15, a fifth pressure sensor 16, and a sixth pressure sensor 19 arranged sequentially. The first pressure sensor 10, the second pressure sensor 12, the third pressure sensor 13, the fourth pressure sensor 15, the fifth pressure sensor 16, and the sixth pressure sensor 19 are all connected to the paperless recorder 23 via cables. The first pressure sensor 10 and the second pressure sensor 12 are connected to both ends of the horizontal pipe 11, with the first pressure sensor 10 positioned near the conveying pipe 902. The third pressure sensor 13 and the fourth pressure sensor 15 are connected to both ends of the inclined pipe 14, with the third pressure sensor 13 positioned near the horizontal pipe 11. The fifth pressure sensor 16 and the sixth pressure sensor 19 are connected to both ends of the vertical pipe 18, with the fifth pressure sensor 16 positioned near the inclined pipe 14. The first pressure sensor 10 and the second pressure sensor 12 measure the pressure at both ends of the horizontal pipe 11, the third pressure sensor 13 and the fourth pressure sensor 15 measure the pressure at both ends of the inclined pipe 14, and the fifth pressure sensor 16 and the sixth pressure sensor 19 measure the pressure at both ends of the vertical pipe 18, and transmit the pressure to the paperless recorder 23 via cable.

[0061] The monitoring unit also includes a high-speed camera 17, which is connected to the computer 24 via wireless communication. The high-speed camera 17 is positioned close to the vertical pipe 18. The high-speed camera 17 captures the oil-water two-phase flow patterns of the horizontal pipe 11, the inclined pipe 14, and the vertical pipe 18, enabling experiments on the upward flow patterns and pressure simulation of the oil-water two-phase flow in the horizontal, inclined, and vertical sections of the horizontal well.

[0062] Example 7

[0063] Experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wellbore, such as... Figure 1 As shown, it includes a two-phase storage unit, which is connected to a mixer 9 via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer 9 is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank 20, which is connected to the two-phase storage unit on the side of the separation tank 20 away from the experimental circuit.

[0064] The two-phase storage unit includes a water tank 1 and an oil tank 2 arranged side by side. Both the water tank 1 and the oil tank 2 are connected to a conveying mechanism. The tops of the water tank 1 and the oil tank 2 are respectively connected to the separation tank 20 through a first connecting pipe 102 and a second connecting pipe 202.

[0065] The first connecting pipe 102 is connected to a first switching valve 22, and the second connecting pipe 202 is connected to a second switching valve 21. Both the first switching valve 22 and the second switching valve 21 are connected close to the separation tank 20.

[0066] The conveying mechanism includes a water outlet pipe 101 and an oil outlet pipe 201, which are connected to a water storage tank 1 and an oil storage tank 2, respectively. Both the water outlet pipe 101 and the oil outlet pipe 201 are connected to a control and monitoring mechanism. The ends of the water outlet pipe 101 and the oil outlet pipe 201 are connected to a collection pipe 901, which is connected to a mixer 9.

[0067] The control and monitoring mechanism includes an aqueous phase flow meter 7 and an oil phase flow meter 8. The aqueous phase flow meter 7 is connected to the body of the water outlet pipe 101, and the oil phase flow meter 8 is connected to the body of the oil outlet pipe 201. Both the aqueous phase flow meter 7 and the oil phase flow meter 8 are connected to the monitoring system via cable 25. The body of the water outlet pipe 101 is connected to a water supply pump 3 and a first regulating valve 5. The water supply pump 3 and the first regulating valve 5 are located between the water storage tank 1 and the aqueous phase flow meter 7. The water supply pump 3 is located close to the water storage tank 1. The body of the oil outlet pipe 201 is connected to an oil supply pump 4 and a second regulating valve 6. The oil supply pump 4 and the second regulating valve 6 are located between the oil storage tank 2 and the oil phase flow meter 8. The oil supply pump 4 is located close to the oil storage tank 2.

[0068] The monitoring system includes a paperless recorder 23, which is connected to the water phase flow meter 7 and the oil phase flow meter 8 via a cable 25. The paperless recorder 23 is connected to a computer 24 via a wire, and the paperless recorder 23 is connected to the monitoring unit via a cable.

[0069] The experimental circuit includes a horizontal pipe 11. One end of the horizontal pipe 11 is connected to the mixer 9 via a delivery pipe 902. An inclined pipe 14 is connected to the end of the horizontal pipe 11 away from the delivery pipe 902. A vertical pipe 18 is connected to the end of the inclined pipe 14 away from the horizontal pipe 11. The end of the vertical pipe 18 away from the inclined pipe 14 is connected to the separation tank 20 via a connecting pipe 2001. The pipe bodies of the horizontal pipe 11, the inclined pipe 14, and the vertical pipe 18 are all connected to the monitoring unit.

[0070] The monitoring unit includes a first pressure sensor 10, a second pressure sensor 12, a third pressure sensor 13, a fourth pressure sensor 15, a fifth pressure sensor 16, and a sixth pressure sensor 19 arranged sequentially. The first pressure sensor 10, the second pressure sensor 12, the third pressure sensor 13, the fourth pressure sensor 15, the fifth pressure sensor 16, and the sixth pressure sensor 19 are all connected to the paperless recorder 23 via cables. The first pressure sensor 10 and the second pressure sensor 12 are connected to both ends of the horizontal pipe 11, with the first pressure sensor 10 positioned near the conveying pipe 902. The third pressure sensor 13 and the fourth pressure sensor 15 are connected to both ends of the inclined pipe 14, with the third pressure sensor 13 positioned near the horizontal pipe 11. The fifth pressure sensor 16 and the sixth pressure sensor 19 are connected to both ends of the vertical pipe 18, with the fifth pressure sensor 16 positioned near the inclined pipe 14.

[0071] The monitoring unit also includes a high-speed camera 17, which is connected to the computer 24 via wireless communication. The high-speed camera 17 is positioned close to the vertical tube 18.

[0072] The horizontal tube 11, the inclined tube 14, and the vertical tube 18 are all made of transparent acrylic glass. The use of transparent acrylic glass tubes allows for visualization of the upward flow pattern of the oil-water two-phase flow.

[0073] The working principle of this utility model's experimental device for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wells is as follows:

[0074] The experimental medium, water, is stored in water tank 1, and white oil is stored in oil tank 2. Water and white oil enter the main pipe 901 through water outlet pipe 101. White oil flowing from oil tank 2 enters the main pipe 901 through oil outlet pipe 201 and is mixed in mixer 9. Water phase flow meter 7 and oil phase flow meter 8 monitor the water phase flow and oil phase flow respectively and transmit the data to paperless recorder 23. Paperless recorder 23 records the water phase flow and oil phase flow. Finally, the data measured by paperless recorder 23 is read by computer 24. The oil phase and water phase flow can be controlled by the first regulating valve 5 and the second regulating valve 6, thereby conducting oil-water two-phase upflow flow pattern and pressure experiments under different oil and water volume conditions. Horizontal pipe 11, inclined pipe 14, and vertical pipe 18 simulate the vertical, inclined, and horizontal sections of a horizontal well, respectively, and are mixed by mixer 9. The water and white oil flow sequentially through the horizontal pipe 11, the inclined pipe 14, and the vertical pipe 18. The first pressure sensor 10, the second pressure sensor 12, the third pressure sensor 13, the fourth pressure sensor 15, the fifth pressure sensor 16, and the sixth pressure sensor 19 record the pressure changes of each pipe section in real time and transmit the data to the paperless recorder 23 via cable. The high-speed camera 17 captures the oil-water two-phase flow pattern of the horizontal pipe 11, the inclined pipe 14, and the vertical pipe 18, realizing the oil-water two-phase upflow pattern experiment and pressure simulation experiment in the horizontal, inclined, and vertical sections of the horizontal well. The experimental medium flows into the separation tank 20 through the vertical section and naturally separates under the action of gravity. The water and white oil flow into the water storage tank 1 and the oil storage tank 2 respectively through the first connecting pipe 102 and the second connecting pipe 202, forming a complete experimental loop.

[0075] This utility model relates to an experimental device for simulating the upward flow pattern and pressure of oil-water two-phase flow in horizontal wells. The simulated pipe sections are continuous, and the applicable pipe inclination angle range is large, which can meet the well inclination angle conditions of continuous variation from 0° to 90° in horizontal wells. The simulated pipe sections are all transparent organic glass pipes, which can realize the visualization of the upward flow pattern of oil-water two-phase flow. The pressure sensor can realize the real-time recording of pressure changes in each simulated pipe section.

Claims

1. An experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore, characterized in that, It includes a two-phase storage unit, which is connected to a mixer (9) via a conveying mechanism. The conveying mechanism is connected to a control and monitoring mechanism, which is connected to a measurement and control system. The mixer (9) is connected to an experimental circuit, which is connected to a monitoring unit. The monitoring unit is connected to the measurement and control system. The experimental circuit is also connected to a separation tank (20), and the side of the separation tank (20) away from the experimental circuit is connected to the two-phase storage unit. The two-phase storage unit includes a water tank (1) and an oil tank (2) arranged side by side. Both the water tank (1) and the oil tank (2) are connected to the conveying mechanism. The tops of the water tank (1) and the oil tank (2) are connected to the separation tank (20) through the first connecting pipe (102) and the second connecting pipe (202), respectively. The experimental circuit includes a horizontal tube (11), one end of which is connected to a mixer (9) via a delivery tube (902). An inclined tube (14) is connected to the end of the horizontal tube (11) away from the delivery tube (902). A vertical tube (18) is connected to the end of the inclined tube (14) away from the horizontal tube (11). The end of the vertical tube (18) away from the inclined tube (14) is connected to a separation tank (20) via a connecting tube (2001). The tube bodies of the horizontal tube (11), the inclined tube (14), and the vertical tube (18) are all connected to a monitoring unit. The monitoring unit includes a first pressure sensor (10), a second pressure sensor (12), a third pressure sensor (13), a fourth pressure sensor (15), a fifth pressure sensor (16), and a sixth pressure sensor (19) arranged sequentially. The first pressure sensor (10), the second pressure sensor (12), the third pressure sensor (13), the fourth pressure sensor (15), the fifth pressure sensor (16), and the sixth pressure sensor (19) are all connected to the paperless recorder (23) via cables. The first pressure sensor (10) and the second pressure sensor (12) are connected to both ends of the horizontal pipe (11), and the first pressure sensor (10) is located near the conveying pipe (902). The third pressure sensor (13) and the fourth pressure sensor (15) are connected to both ends of the inclined pipe (14), and the third pressure sensor (13) is located near the horizontal pipe (11). The fifth pressure sensor (16) and the sixth pressure sensor (19) are connected to both ends of the vertical pipe (18), and the fifth pressure sensor (16) is located near the inclined pipe (14).

2. The experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore according to claim 1, characterized in that, The first connecting pipe (102) is connected to a first switching valve (22), and the second connecting pipe (202) is connected to a second switching valve (21). Both the first switching valve (22) and the second switching valve (21) are connected close to the separator (20).

3. The experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore according to claim 1, characterized in that, The conveying mechanism includes a water outlet pipe (101) and an oil outlet pipe (201), which are connected to a water storage tank (1) and an oil storage tank (2) respectively. Both the water outlet pipe (101) and the oil outlet pipe (201) are connected to a control and monitoring mechanism. The ends of the water outlet pipe (101) and the oil outlet pipe (201) are connected to a collection pipe (901), which is connected to a mixer (9).

4. The experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore according to claim 3, characterized in that, The control and monitoring mechanism includes a water phase flow meter (7) and an oil phase flow meter (8). The water phase flow meter (7) is connected to the body of the water outlet pipe (101), and the oil phase flow meter (8) is connected to the body of the oil outlet pipe (201). Both the water phase flow meter (7) and the oil phase flow meter (8) are connected to the monitoring system via cables (25). The body of the water outlet pipe (101) is connected to a water supply pump (3) and a first regulating valve (5). The water supply pump (3) and the first regulating valve (5) are located between the water storage tank (1) and the water phase flow meter (7). The water supply pump (3) is located close to the water storage tank (1). The body of the oil outlet pipe (201) is connected to an oil supply pump (4) and a second regulating valve (6). The oil supply pump (4) and the second regulating valve (6) are located between the oil storage tank (2) and the oil phase flow meter (8). The oil supply pump (4) is located close to the oil storage tank (2).

5. The experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore according to claim 4, characterized in that, The monitoring system includes a paperless recorder (23), which is connected to a water phase flow meter (7) and an oil phase flow meter (8) via a cable (25). The paperless recorder (23) is connected to a computer (24) via a wire, and the paperless recorder (23) is connected to the monitoring unit via a cable.

6. The experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore according to claim 1, characterized in that, It also includes a high-speed camera (17), which is connected to a computer (24) via wireless communication and is positioned close to the vertical tube (18).

7. The experimental apparatus for simulating the upward flow pattern and pressure of oil-water two-phase flow in a horizontal wellbore according to claim 1, characterized in that, The horizontal tube (11), inclined tube (14) and vertical tube (18) are all made of transparent plexiglass tubes.

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