Heavy oil reservoir exploitation simulation device

Abstract

The utility model relates to the technical field of oil reservoir simulation, in particular to a heavy oil reservoir exploitation simulation device. The heavy oil reservoir exploitation simulation device comprises a workbench and a supporting frame fixedly installed at the top end of the workbench. The control terminal is fixedly mounted on the workbench; the supporting sleeve is fixedly installed on the supporting frame, a core barrel is installed in the supporting sleeve, and a thick oil injection mechanism is installed at the bottom end of the supporting sleeve; the pretreatment mechanism used for thick oil thermal recovery and thick oil reduction simulation is installed in the supporting sleeve and comprises an upper sleeve, the upper sleeve is installed at the top end of the supporting sleeve in a butt joint mode through a flange, an injection pipe is fixedly inserted into the upper sleeve, and a steam injection screen pipe is fixedly installed at the bottom end of the injection pipe. A plurality of air holes are evenly formed in the steam injection screen pipe, and a plurality of vibration pieces are installed on the steam injection screen pipe. The heavy oil reservoir exploitation simulation device has the advantages of being convenient and comprehensive in simulation and convenient to simulate and observe.

Description

Technical Field

[0001] The utility model relates to the technical field of reservoir simulation, in particular to a simulation device for heavy oil reservoir exploitation. Background Technique

[0002] The exploitation of heavy oil reservoirs refers to extracting crude oil with high viscosity and high density from underground reservoirs (the API degree is generally less than 20 and the viscosity is higher than 50 mPa·s). Due to the poor fluidity of heavy oil, the effect of conventional exploitation methods is limited, and special technologies need to be adopted to improve the recovery rate.

[0003] At present, the existing heavy oil reservoir exploitation technologies mainly include thermal oil recovery, chemical flooding, viscosity reduction by dilution, microbial oil recovery, cold production technology, etc. In order to maximize the exploitation efficiency of heavy oil reservoirs, reservoir simulation experiments are usually carried out in the laboratory. However, when the existing reservoir simulation devices carry out reservoir simulation experiments, most of them are single-mode exploitation simulations and cannot perform technical combination simulations, resulting in incomplete reservoir exploitation simulations and unable to conduct comprehensive simulation experiments.

[0004] Therefore, it is necessary to provide a simulation device for heavy oil reservoir exploitation to solve the above technical problems. Content of the Utility Model

[0005] To solve the above technical problems, the utility model provides a simulation device for heavy oil reservoir exploitation.

[0006] The simulation device for heavy oil reservoir exploitation provided by the utility model includes: a workbench, and a support frame fixedly installed at the top end of the workbench;

[0007] A control terminal, fixedly installed on the workbench;

[0008] A support sleeve, fixedly installed on the support frame, and a core tube is installed in the support sleeve, and a heavy oil injection mechanism is installed at the bottom end of the support sleeve;

[0009] A pretreatment mechanism for simulating the viscosity reduction of heavy oil in thermal exploitation is installed in the support sleeve. The pretreatment mechanism includes an upper casing, the upper casing is installed at the top end of the support sleeve through flange docking, and an injection pipe is fixedly inserted on the upper casing. A steam injection screen pipe is fixedly installed at the bottom end of the injection pipe. A plurality of pores are evenly opened on the steam injection screen pipe, and a plurality of vibration sheets are installed on the steam injection screen pipe. An ultrasonic vibration rod is embedded in the steam injection screen pipe, and the ultrasonic vibration rod is electrically connected to the control terminal. The top end of the injection pipe is communicated with a steam generator, and an oil return mechanism is installed on one side of the top end of the upper casing.

[0010] Preferably, the heavy oil injection mechanism includes a lower casing and a plunger pump, the lower casing for sealing the support sleeve is fixedly installed on the bottom end of the support sleeve, the plunger pump is fixedly installed on the workbench and electrically connected to the control terminal, and the liquid outlet end of the plunger pump is connected to the lower casing through a conduit, and the liquid inlet end of the plunger pump is connected to the heavy oil tank.

[0011] Preferably, a control valve is installed on a conduit connecting the liquid outlet end of the plunger pump and the lower casing, and the control valve is electrically connected to the control terminal.

[0012] Preferably, the oil return mechanism includes an oil return pipe, the oil return pipe is fixedly mounted on one side of the upper casing, and a flow meter is installed on the oil return pipe, the flow meter is electrically connected to the control terminal, and a transparent observation tube for receiving the return oil of the oil return pipe is installed on the support frame, and one side of the top end of the transparent observation tube is connected to an overflow pipe, and the overflow pipe is connected to an oil return tank.

[0013] Preferably, electric rods are symmetrically installed on the top of the upper sleeve, and a connecting ring is fixedly installed on the output ends of the two groups of electric rods. A plurality of connecting springs are installed on the connecting ring, and a sealing piston is fixedly installed on the ends of the plurality of connecting springs away from the connecting ring. The two groups of electric rods are electrically connected to the control terminal.

[0014] Preferably, the outer wall of the sealing piston is slidably matched with the inner wall of the upper sleeve, the inner wall of the sealing piston is slidably matched with the outer wall of the injection tube, and the outer wall and the inner wall of the sealing piston are both embedded with sealing rings.

[0015] Preferably, a temperature sensor and a pressure sensor are embedded in the lower casing, and the temperature sensor and the pressure sensor are electrically connected to the control terminal.

[0016] Compared with the related art, the heavy oil reservoir mining simulation device provided by the utility model has the following beneficial effects:

[0017] 1. The utility model provides a heavy oil reservoir exploitation simulation device, which is provided with a pretreatment mechanism on a support sleeve, and the pretreatment mechanism cooperates with a casing, an injection pipe, a steam injection screen pipe, a vibration sheet and an ultrasonic vibration rod, so as to simulate the combination of heavy oil steam drive thermal recovery and ultrasonic vibration, and perform efficient simulation of heavy oil reservoir exploitation;

[0018] 2. By setting up the oil return mechanism, the dilution of the simulated heavy oil can be observed intuitively when simulating the production of heavy oil reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural schematic diagram of a preferred embodiment of the heavy oil reservoir exploitation simulation device provided by the utility model;

[0020] Figure 2 A structural schematic diagram of another perspective of the heavy oil reservoir exploitation simulation device provided by the present utility model;

[0021] Figure 3 An axial sectional structural schematic diagram of the support sleeve provided by the present utility model;

[0022] Figure 4 A half-sectional structural schematic diagram of the support sleeve provided by the present utility model.

[0023] Reference numerals in the figure: 1, workbench; 2, support frame; 3, support sleeve; 4, core tube; 5, heavy oil injection mechanism; 51, lower casing; 52, plunger pump; 53, heavy oil tank; 54, control valve; 6, pretreatment mechanism; 61, upper casing; 62, injection tube; 63, steam injection screen pipe; 64, vibration plate; 65, ultrasonic vibration rod; 601, air hole; 7, steam generator; 8, oil return mechanism; 81, oil return pipe; 82, flowmeter; 83, transparent observation cylinder; 84, overflow pipe; 85, oil return tank; 86, electric rod; 87, connecting ring; 88, connecting spring; 89, sealing piston; 9, control terminal; 91, temperature sensor; 92, pressure sensor. Specific embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] The following describes in detail the specific implementation of the present utility model with reference to specific embodiments.

[0026] Please refer to Figures 1 to 4 , a heavy oil reservoir exploitation simulation device provided by an embodiment of the present utility model, the heavy oil reservoir exploitation simulation device includes:

[0027] A workbench 1 and a support frame 2 fixedly installed at the top of the workbench 1;

[0028] A control terminal 9 fixedly installed on the workbench 1;

[0029] A support sleeve 3 fixedly installed on the support frame 2, a core tube 4 is installed in the support sleeve 3, and a heavy oil injection mechanism 5 is installed at the bottom end of the support sleeve 3;

[0030] The pretreatment mechanism 6 for simulating the viscosity reduction of heavy oil thermal recovery is installed in the support sleeve 3. The pretreatment mechanism 6 includes an upper casing 61, which is installed at the top of the support sleeve 3 by flange docking. An injection pipe 62 is fixedly inserted on the upper casing 61. A steam injection screen pipe 63 is fixedly installed at the bottom end of the injection pipe 62. A number of air holes 601 are evenly arranged on the steam injection screen pipe 63. A number of vibrating plates 64 are installed on the steam injection screen pipe 63. An ultrasonic vibration rod 65 is embedded in the steam injection screen pipe 63. The ultrasonic vibration rod 65 is electrically connected to the control terminal 9. The top end of the injection pipe 62 is communicated with a steam generator 7. A return oil mechanism 8 is installed on one side of the top end of the upper casing 61.

[0031] Among them, the heavy oil injection mechanism 5 includes a lower casing 51 and a piston pump 52. The lower casing 51 for sealing the support sleeve 3 is fixedly installed at the bottom end of the support sleeve 3. The piston pump 52 is fixedly installed on the workbench 1 and is electrically connected to the control terminal 9. The liquid outlet end of the piston pump 52 is communicated with the lower casing 51 through a conduit. The liquid inlet end of the piston pump 52 is communicated with a heavy oil tank 53. A control valve 54 is installed on the conduit where the liquid outlet end of the piston pump 52 is communicated with the lower casing 51. The control valve 54 is electrically connected to the control terminal 9.

[0032] It should be noted that during use, the piston pump 52 is controlled by the control terminal 9 to quantitatively transport the heavy oil in the heavy oil tank 53 into the support sleeve 3 and the core tube 4. After quantitative transportation, the control valve 54 is closed, and then the ultrasonic vibration rod 65 and the steam generator 7 are started. Steam is continuously injected into the core tube 4 through the injection pipe 62, the steam injection screen pipe 63 and the air holes 601 to heat and pressurize the heavy oil inside to reduce its viscosity. While injecting steam, the gas impacts the vibrating plate 64, and the vibrating plate 64 stirs the heavy oil inside. Then, in cooperation with the ultrasonic vibration rod 65, ultrasound is used to reduce the viscosity of the heavy oil, thereby completing the downhole combination of reducing the viscosity of the heavy oil and simulating the expansion of the steam chamber. Then, the thickened oil is observed for oil return by using the return oil mechanism 8. The entire oil reservoir simulation is controlled by the control terminal 9 and data is collected.

[0033] It is worth noting that when the steam generator 7 is communicated with the injection pipe 62, a one-way valve is arranged at the communication part, so that only steam is allowed to be discharged from the injection pipe 62, and the heavy oil inside will not flow back into the steam generator 7 from the injection pipe 62. And here the control terminal 9 is an intelligent microcomputer, with a control chip or a single-chip microcomputer built in for controlling the entire heavy oil reservoir simulation.

[0034] In the embodiment of the present utility model, please refer to Figures 1 to 4The oil return mechanism 8 includes an oil return pipe 81, which is fixedly mounted on one side of the upper casing 61, and a flow meter 82 is mounted on the oil return pipe 81, and the flow meter 82 is electrically connected to the control terminal 9, and a transparent observation tube 83 for receiving the oil return from the oil return pipe 81 is mounted on the support frame 2, and an overflow pipe 84 is connected to the top side of the transparent observation tube 83, and the overflow pipe 84 is connected to the oil return tank 85;

[0035] The top of the upper sleeve 61 is symmetrically installed with electric rods 86, and the output ends of the two groups of electric rods 86 are commonly fixedly installed with a connecting ring 87, on which a number of connecting springs 88 are installed, and a sealing piston 89 is commonly fixedly installed on the ends of the several connecting springs 88 facing away from the connecting ring 87. The two groups of electric rods 86 are electrically connected to the control terminal 9.

[0036] It should be noted that: when steam gas drive is performed and pressure maintenance is required, the electric rod 86 is controlled to drive the connecting ring 87, and the sealing piston 89 is driven to slide to the bottom of the return oil pipe 81 through the connecting spring 88, so as to complete the closing of the upper casing 61. When the pressure of the pressure-maintaining gas drive reaches the set value, the electric rod 86 is controlled to drive the connecting ring 87 to move upward, so as to use the connecting spring 88 to drive the sealing piston 89 to move to the top of the return oil pipe 81, open the return oil pipe 81, and then the oil in the core tube 4 automatically flows from the return oil pipe 81 into the transparent observation tube 83, which is convenient for observation. When the oil flowing into the transparent observation tube 83 is higher than the overflow pipe 84, it flows from the overflow pipe 84 into the return oil tank 85. When flowing in, the flow rate of the return oil can be detected by the flow meter 82, which is convenient for collecting the return oil data.

[0037] In the present embodiment, the outer wall of the sealing piston 89 slides with the inner wall of the upper sleeve 61, the inner wall of the sealing piston 89 slides with the outer wall of the injection tube 62, and both the outer wall and the inner wall of the sealing piston 89 are embedded with sealing rings. This makes it easy to use the sealing piston 89 to seal the upper sleeve 61, and the connection state between the upper sleeve 61 and the oil return pipe 81 can be controlled.

[0038] In the embodiments of the present invention, please refer to Figures 1 to 4 A temperature sensor 91 and a pressure sensor 92 are embedded in the lower casing 51, and the temperature sensor 91 and the pressure sensor 92 are electrically connected to the control terminal 9;

[0039] It should be noted that the temperature sensor 91 and the pressure sensor 92 are used to monitor the temperature and pressure inside the support sleeve 3 in real time, so as to collect the opening data of the heavy oil reservoir simulation.

[0040] Further, the temperature and pressure inside the support sleeve 3 are adjusted by controlling the steam temperature and steam injection volume of the steam generator 7. Specifically, the core of the steam generator 7 is to heat water to the boiling point through a heat source to generate saturated steam or further superheat it into dry steam. The process is divided into the following stages: Feed water supply: After the water undergoes pretreatment (such as deaeration and softening), it is sent into the steam generator by a feed water pump; Heating stage: The water absorbs heat on the heating surface (such as tube bundles, furnace), and the temperature gradually rises to the saturation temperature; Vaporization stage: The saturated water continues to absorb heat and undergoes a phase change to become saturated steam (wet steam), and then it is connected to the injection pipe 62 for steam injection.

[0041] The working principle of the heavy oil reservoir exploitation simulation device provided by the present utility model is as follows:

[0042] In use, the control terminal 9 controls the piston pump 52 to quantitatively transport the heavy oil in the heavy oil tank 53 into the support sleeve 3 and the core tube 4. After the quantitative transportation, the control valve 54 is closed, and then the ultrasonic vibration rod 65 and the steam generator 7 are started. The steam is continuously injected into the core tube 4 through the injection pipe 62, the steam injection screen pipe 63, and the air holes 601 to heat and pressurize the heavy oil inside to reduce its viscosity. While injecting the steam, the gas impacts the vibration plate 64, and the vibration plate 64 stirs the heavy oil inside. Cooperating with the ultrasonic vibration rod 65, the viscosity of the heavy oil is reduced by using ultrasonic waves, thereby completing the downhole combination of reducing the viscosity of the heavy oil and simulating the expansion of the steam chamber. When pressure needs to be maintained during steam gas drive, the electric rod 86 is controlled to drive the connecting ring 87, and the sealing piston 89 is driven to slide below the oil return pipe 81 through the connecting spring 88, thereby completing the closing of the upper casing 61. When the pressure of the pressure-maintaining gas drive reaches the set value, the electric rod 86 is controlled to drive the connecting ring 87 to move upward, thereby driving the sealing piston 89 to move above the oil return pipe 81 through the connecting spring 88, opening the oil return pipe 81. Then, the oil liquid in the core tube 4 automatically flows into the transparent observation cylinder 83 through the oil return pipe 81 for easy observation. When the oil liquid flowing into the transparent observation cylinder 83 is higher than the overflow pipe 84, it flows into the oil return tank 85 through the overflow pipe 84. When flowing in, the flowmeter 82 can detect the flow rate of the oil return, which is convenient for collecting the data of the oil return.

[0043] The circuits and controls involved in the present utility model are all prior arts and will not be elaborated here too much.

[0044] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present utility model.

Claims

1. A heavy oil reservoir exploitation simulation device, comprising: A workbench (1), and a support frame (2) fixedly mounted on the top of the workbench (1); A control terminal (9) fixedly mounted on the workbench (1); It is characterized by further comprising: A support sleeve (3) is fixedly mounted on the support frame (2), a core tube (4) is installed in the support sleeve (3), and a heavy oil injection mechanism (5) is installed at the bottom end of the support sleeve (3); A pretreatment mechanism (6), the pretreatment mechanism (6) for heavy oil thermal recovery simulation viscosity reduction is installed in the support sleeve (3), and the pretreatment mechanism (6) comprises an upper casing (61), the upper casing (61) is installed on the top of the support sleeve (3) through a flange butt joint, and an injection pipe (62) is fixedly inserted on the upper casing (61), a steam injection screen (63) is fixedly installed at the bottom end of the injection pipe (62), a plurality of air holes (601) are evenly opened on the steam injection screen (63), and a plurality of vibration plates (64) are installed on the steam injection screen (63), an ultrasonic vibration rod (65) is embedded in the steam injection screen (63), and the ultrasonic vibration rod (65) is electrically connected to a control terminal (9), the top of the injection pipe (62) is connected to a steam generator (7), and an oil return mechanism (8) is installed on one side of the top of the upper casing (61).

2. The heavy oil reservoir exploitation simulation device according to claim 1, characterized in that: The heavy oil injection mechanism (5) comprises a lower casing (51) and a plunger pump (52), wherein the lower casing (51) for sealing the support sleeve (3) is fixedly mounted on the bottom end of the support sleeve (3), the plunger pump (52) is fixedly mounted on the workbench (1) and is electrically connected to the control terminal (9), and a liquid outlet of the plunger pump (52) is connected to the lower casing (51) via a conduit, and a liquid inlet of the plunger pump (52) is connected to a heavy oil tank (53).

3. The heavy oil reservoir exploitation simulation device according to claim 2, characterized in that: A control valve (54) is installed on a conduit that communicates between the liquid outlet end of the plunger pump (52) and the lower casing (51), and the control valve (54) is electrically connected to a control terminal (9).

4. The heavy oil reservoir exploitation simulation device according to claim 1, characterized in that: The oil return mechanism (8) comprises an oil return pipe (81), the oil return pipe (81) being fixedly mounted on one side of the upper casing (61), and a flow meter (82) being mounted on the oil return pipe (81), the flow meter (82) being electrically connected to a control terminal (9), and a transparent observation tube (83) for receiving return oil from the oil return pipe (81) being mounted on the support frame (2), a top side of the transparent observation tube (83) being connected to an overflow pipe (84), and the overflow pipe (84) being connected to an oil return tank (85).

5. The heavy oil reservoir exploitation simulation device according to claim 4, characterized in that: Electric rods (86) are symmetrically mounted on the top of the upper sleeve (61); a connecting ring (87) is fixedly mounted on the output ends of the two groups of electric rods (86); a plurality of connecting springs (88) are mounted on the connecting ring (87); a sealing piston (89) is fixedly mounted on one end of the plurality of connecting springs (88) facing away from the connecting ring (87); and the two groups of electric rods (86) are electrically connected to the control terminal (9).

6. The heavy oil reservoir exploitation simulation device according to claim 5, characterized in that: The outer wall of the sealing piston (89) is slidably matched with the inner wall of the upper sleeve (61), the inner wall of the sealing piston (89) is slidably matched with the outer wall of the injection tube (62), and sealing rings are embedded in the outer wall and the inner wall of the sealing piston (89).

7. The heavy oil reservoir exploitation simulation device according to claim 2, characterized in that: A temperature sensor (91) and a pressure sensor (92) are embedded in the lower casing (51), and the temperature sensor (91) and the pressure sensor (92) are electrically connected to the control terminal (9).

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