Experimental device for simulating thermal recovery process of heavy oil reservoir under action of top water and bottom water

Abstract

The utility model relates to an experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water, which comprises an experimental box, and a reservoir simulation container is loaded in the experimental box; a top water cavity, a heavy oil reservoir cavity and a bottom water cavity are sequentially arranged in the reservoir simulation container from top to bottom; the top water cavity, the heavy oil reservoir cavity and the bottom water cavity are provided with a top water connector, a steam pipe connector and a bottom water connector respectively. Wherein the heavy oil reservoir cavity is filled with a mixture of quartz sand and heavy oil and is used for simulating the heavy oil reservoir; the process that the top water enters the heavy oil reservoir cavity through the top water cavity and the process that the bottom water enters the heavy oil reservoir cavity through the bottom water cavity are respectively used for simulating the effects of the top water layer and the bottom water layer on the heavy oil reservoir; the fluid channeling process of the steam in the mixture of the quartz sand and the heavy oil in the cavity of the heavy oil reservoir is used for simulating the thermal recovery process of the heavy oil reservoir.

Description

Technical Field

[0001] The utility model relates to the field of experimental devices, in particular to an experimental device for simulating a thermal recovery process of a heavy oil reservoir under the action of top water and bottom water. Background Art

[0002] In recent years, unconventional resources such as heavy oil have become increasingly important in oil and gas development. These reservoirs are typically exploited using horizontal well steam stimulation or SAGD (steam-assisted gravity drainage) techniques. However, many newly discovered offshore heavy oil reservoirs have complex geology, widespread water bodies, and strong reservoir heterogeneity. During production, as reservoir pressure decreases, the pressure differential between the top and bottom water layers and the oil layer changes, causing water intrusion into the reservoir and forming water channeling. Water breakthrough in oil wells causes a sharp drop in production and a rapid increase in water cut, severely impacting development effectiveness. Water intrusion has become a significant factor influencing the development of heavy oil reservoirs with top and bottom water. Therefore, it is crucial to simulate top and bottom water intrusion, monitor its dynamic characteristics, and study its impact on heavy oil thermal recovery.

[0003] Two-dimensional physical simulation experiments can more objectively reflect the actual production process of oilfields. Currently, existing two-dimensional heavy oil thermal recovery experimental devices can only simulate pure oil reservoirs and do not consider the oil-water distribution pattern of top water and bottom water in the reservoir. They are unable to simulate the dynamic characteristics of top water and bottom water intrusion into the oil layer during production, nor can they study the impact of water invasion on steam chamber expansion and oil production. Utility Model Content

[0004] In response to the above problems, the purpose of the present invention is to provide an experimental device for simulating the thermal recovery process of heavy oil reservoirs under the action of top water and bottom water, which is used to solve the problem that the current two-dimensional heavy oil thermal recovery experimental device is unable to simulate the dynamic characteristics of top water and bottom water intrusion into the oil layer during the production process and study the impact of water invasion on steam chamber expansion and oil production.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model discloses an experimental device for simulating a thermal recovery process of a heavy oil reservoir under the action of top water and bottom water. The device comprises an experimental box, wherein a reservoir simulation container is loaded inside the experimental box; a top water cavity, a heavy oil reservoir reservoir cavity and a bottom water cavity are sequentially arranged in the reservoir simulation container from top to bottom, and the top water cavity is connected to the heavy oil reservoir reservoir cavity through an upper channel, and the bottom water cavity is connected to the heavy oil reservoir reservoir cavity through a lower channel; the top water cavity, the heavy oil reservoir reservoir cavity and the bottom water cavity are respectively provided with a top water interface, a steam pipe interface and a bottom water interface.

[0007] Wherein, the cavity of the heavy oil reservoir is filled with a mixture of quartz sand and heavy oil to simulate the heavy oil reservoir;

[0008] The top water interface is used to receive top water, and the bottom water interface is used to receive bottom water. The process in which the top water enters the heavy oil reservoir cavity through the top water cavity and the process in which the bottom water enters the heavy oil reservoir cavity through the bottom water cavity are used to simulate the effects of the top water layer and the bottom water layer on the heavy oil reservoir, respectively.

[0009] The steam pipe interface is used for connecting steam, and the process of steam flowing through the mixture of quartz sand and heavy oil in the heavy oil reservoir cavity is used to simulate the thermal recovery process of the heavy oil reservoir.

[0010] Furthermore, the top water cavity is separated from the heavy oil reservoir reservoir cavity by a top plate, and the top plate is provided with at least one water inlet hole on a side facing the top water cavity, and a plurality of water outlet holes on a side facing the heavy oil reservoir reservoir cavity, and the plurality of water outlet holes of the top plate are respectively connected to the water inlet holes, thereby forming the upper channel;

[0011] The heavy oil reservoir cavity and the bottom water cavity are separated by a bottom plate, and the bottom plate is provided with at least one water inlet hole on a side facing the bottom water cavity, and a plurality of water outlet holes on a side facing the heavy oil reservoir cavity, and the plurality of water outlet holes of the bottom plate are respectively connected to the water inlet holes, thereby forming the lower channel.

[0012] Furthermore, the experimental box is equipped with a vehicle body, and a flip bracket is respectively provided on both sides of the vehicle body; a rotating shaft is provided on the two flip brackets; the experimental box is provided on the rotating shaft and can rotate as the rotating shaft rotates.

[0013] Preferably, the experimental box is a heating constant temperature box.

[0014] Furthermore, a plurality of temperature probes are inserted into the heavy oil reservoir cavity, and each temperature probe is arranged in parallel and evenly spaced in the heavy oil reservoir cavity for detecting the internal temperature of the heavy oil reservoir.

[0015] Furthermore, the experimental device also includes a steam injection system, which includes a steam pipe, a distilled water container, a distilled water constant speed and pressure pump and a steam generator.

[0016] The outlet of the distilled water container is connected to the inlet of the distilled water constant speed and constant pressure pump through a pipeline;

[0017] The outlet of the distilled water constant speed and constant pressure pump is connected to the inlet of the steam generator through a pipeline;

[0018] The outlet of the steam generator is connected to the inlet of the steam pipe;

[0019] The outlet of the steam pipe is connected to the steam pipe interface.

[0020] Furthermore, the experimental device also includes a top water and bottom water injection system, which includes a top water pipe and a bottom water pipe, a formation water container, a top water constant speed and pressure pump, a bottom water constant speed and pressure pump, a top water intermediate container, and a bottom water intermediate container.

[0021] The outlet of the formation water container is connected to the inlet of the top water constant speed and pressure pump and the bottom water constant speed and pressure pump through pipelines respectively.

[0022] The outlet of the top water constant speed and constant pressure pump is connected to the inlet of the top water intermediate container, the water outlet of the top water intermediate container is connected to the inlet of the top water pipe, and the outlet of the top water pipe is connected to the top water interface;

[0023] The outlet of the bottom water constant speed and constant pressure pump is connected to the water inlet of the bottom intermediate container, the outlet of the bottom water intermediate container is connected to the inlet of the bottom water pipe, and the outlet of the bottom water pipe is connected to the bottom water interface.

[0024] Furthermore, the experimental device also includes a data acquisition system, which includes a computer, and a plurality of temperature probes are respectively connected to the computer.

[0025] Furthermore, the experimental device also includes a recovery system, which includes a recovery pipe and a measuring cylinder. The heavy oil reservoir cavity of the reservoir simulation container is equipped with a drain port. The water inlet end of the recovery pipe is connected to the drain port of the reservoir simulation container. The measuring cylinder is arranged below the water outlet end of the recovery pipe. A back pressure valve and a flow meter are provided on the recovery pipe.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] (1) The present invention provides an experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water. The cavity of the heavy oil reservoir is filled with a mixture of quartz sand and heavy oil, which is used to simulate the heavy oil reservoir; the top water interface is used to receive top water, and the bottom water interface is used to receive bottom water. The process of top water entering the cavity of the heavy oil reservoir through the top water cavity and the process of bottom water entering the cavity of the heavy oil reservoir through the bottom water cavity are respectively used to simulate the effects of the top water layer and the bottom water layer on the heavy oil reservoir; the steam pipe interface is used to connect steam, and the process of steam flowing through the mixture of quartz sand and heavy oil in the cavity of the heavy oil reservoir is used to simulate the thermal recovery process of the heavy oil reservoir.

[0028] (2) The present invention provides an experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water. The device simulates the effects of the top water layer and the bottom water layer on the heavy oil reservoir through the process of top water entering the heavy oil reservoir cavity through the top water cavity and the process of bottom water entering the heavy oil reservoir cavity through the bottom water cavity, and simulates the thermal recovery process of the heavy oil reservoir through the process of steam flowing through the mixture of quartz sand and heavy oil in the heavy oil reservoir cavity. The internal temperature of the heavy oil reservoir is then monitored using a temperature probe. This not only realizes the simulation of the thermal recovery process of the heavy oil reservoir under the action of the top water layer and the bottom water layer, but also can realize the invasion of top water and bottom water into the oil reservoir and monitor the dynamic characteristics of water invasion, thereby providing a basis for the physical simulation experiment of the SAGD water invasion seepage dynamics of the heavy oil reservoir under the action of top water and bottom water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the overall structure of an experimental device for simulating thermal recovery of a heavy oil reservoir under the action of top water and bottom water provided in Example 1 of the present utility model;

[0030] Figure 2 A front view schematic diagram of a reservoir simulation container provided in Example 1 of the present utility model;

[0031] Figure 3 A side view of the reservoir simulation container provided in Example 1 of the present utility model;

[0032] Figure 4 A three-dimensional view of the front side of the top plate or bottom plate provided in Example 1 of the present utility model;

[0033] Figure 5 A three-dimensional view of the reverse side of the top plate or bottom plate provided in Example 1 of the present utility model;

[0034] Figure 6 A schematic diagram of the structure of the experimental box provided in Example 1 of the present utility model and equipped with a vehicle body;

[0035] Figure 7 A schematic structural diagram of a steam injection system provided in Example 1 of the present utility model;

[0036] Figure 8 This is a structural diagram of the top water and bottom water injection system provided in Example 1 of the present utility model.

[0037] Explanation of reference numerals: 100 - top water cavity, 101 - top water interface; 200 - heavy oil reservoir cavity, 201 - steam pipe interface; 300 - bottom water cavity, 301 - bottom water interface;

[0038] 1-experimental box, 10-reservoir simulation container, 111-top plate, 112-bottom plate, 113-water inlet, 114-water outlet;

[0039] 12-car body, 121-turning bracket, 122-rotating shaft;

[0040] 13-fixing plate, 130-fixing hole;

[0041] 14- Temperature probe;

[0042] 2-steam injection system, 20-steam pipe, 21-distilled water container, 22-distilled water constant speed and pressure pump, 23-steam generator;

[0043] 3- Top water and bottom water injection system, 302- Bottom water pipe, 303- Top water pipe, 31- Formation water container, 321- Top water constant speed and pressure pump, 322- Bottom water constant speed and pressure pump, 331- Top water intermediate container, 332- Bottom water intermediate container;

[0044] 4-Data acquisition system;

[0045] 5-Recycling system. DETAILED DESCRIPTION

[0046] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0047] In order to solve the problem that the existing two-dimensional heavy oil thermal recovery experimental device is unable to simulate the dynamic characteristics of top water and bottom water intrusion into the oil layer during the production process and to study the influence of water invasion on the expansion of the steam chamber and oil production, the utility model provides an experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water. The heavy oil reservoir cavity is filled with a mixture of quartz sand and heavy oil, which is used to simulate the heavy oil reservoir; the top water interface is used to receive top water, and the bottom water interface is used to receive bottom water. The process of top water entering the heavy oil reservoir cavity through the top water cavity and the process of bottom water entering the heavy oil reservoir cavity through the bottom water cavity are respectively used to simulate the effects of the top water layer and the bottom water layer on the heavy oil reservoir; the steam pipe interface is used to connect steam, and the process of steam flowing in the mixture of quartz sand and heavy oil in the heavy oil reservoir cavity is used to simulate the thermal recovery process of the heavy oil reservoir.

[0048] Example 1: An experimental device for simulating thermal recovery of heavy oil reservoirs under the action of top water and bottom water

[0049] Example 1 of the present invention provides an experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water, which is used to simulate the thermal recovery process of a heavy oil reservoir under the action of top water layer and bottom water layer. Its structure is described in detail below with reference to the accompanying drawings.

[0050] refer to Figure 1 The experimental device for simulating the thermal recovery process of a heavy oil reservoir includes an experimental box 1, a steam injection system 2, a top water and bottom water injection system 3, a data acquisition system 4 and a recovery system 5.

[0051] refer to Figure 2 and Figure 3 The experimental device for simulating thermal recovery process of heavy oil reservoir under the action of top water and bottom water comprises an experimental box 1, wherein a reservoir simulation container 10 is loaded in the experimental box 1;

[0052] The reservoir simulation container 10 is provided with a top water chamber 100, a heavy oil reservoir reservoir chamber 200, and a bottom water chamber 300 in order from top to bottom. The top water chamber 100 is connected to the heavy oil reservoir reservoir chamber 200 through an upper channel, and the bottom water chamber 300 is connected to the heavy oil reservoir reservoir chamber 200 through a lower channel.

[0053] The top water chamber 100, the heavy oil reservoir chamber 200 and the bottom water chamber 300 are respectively equipped with a top water interface 101, a steam pipe interface 201 and a bottom water interface 301;

[0054] The heavy oil reservoir cavity 200 is filled with a mixture of quartz sand and heavy oil to simulate the heavy oil reservoir;

[0055] The top water interface 101 is used to connect to the top water pipe 303 to receive top water, and the bottom water interface 301 is used to connect to the bottom water pipe 302 to receive bottom water. The process of top water entering the heavy oil reservoir cavity 200 through the top water cavity 100 and the process of bottom water entering the heavy oil reservoir cavity 200 through the bottom water cavity 300 are used to simulate the effects of the top water layer and the bottom water layer on the heavy oil reservoir, respectively.

[0056] The steam pipe interface 201 is used to connect to the steam pipe 20. The process of steam flowing through the mixture of quartz sand and heavy oil in the heavy oil reservoir cavity 200 is used to simulate the thermal recovery process of the heavy oil reservoir.

[0057] As a specific way to achieve "upper channel" and "lower channel", continue to refer to Figure 3The top water cavity 100 is separated from the heavy oil reservoir reservoir cavity 200 by a top plate 111, and the top plate 111 is provided with at least one water inlet hole 113 on a side facing the top water cavity 100, and a plurality of water outlet holes 114 on a side facing the heavy oil reservoir reservoir cavity 200, and the plurality of water outlet holes 114 of the top plate 111 are respectively connected to the water inlet holes 113, thereby forming the upper channel, as shown in FIG. Figure 4 and Figure 5 The heavy oil reservoir chamber 200 and the bottom water chamber 300 are separated by a bottom plate 112, and the bottom plate 112 is provided with at least one water inlet 113 on a side facing the bottom water chamber 300, and a plurality of water outlet holes 114 on a side facing the heavy oil reservoir chamber 200, and the plurality of water outlet holes 114 of the bottom plate 112 are respectively connected to the water inlet holes 113, thereby forming the lower channel, as shown in FIG. Figure 4 and Figure 5 shown.

[0058] For the convenience of description, the side of the top plate 111 and the bottom plate 112 where the water inlet hole 113 is provided is named the front side, and the other side is named the back side.

[0059] Among them, the top water and bottom water flow out from the outlet of the top water pipe and bottom water pipe of the top water and bottom water injection system 3 respectively, enter the side of the water inlet hole 113 of the top plate 111 or the bottom plate 112, enter the top plate 111 or the bottom plate 112 through the water inlet hole 113, and finally flow out from the water outlet 114.

[0060] Specifically, the top edge of the top plate 111 that is lower than the top end of the reservoir simulation container 10 forms the top water cavity 100, the bottom edge of the bottom plate 112 that is higher than the bottom end of the reservoir simulation container 10 forms the bottom water cavity 300, and the space sandwiched between the top plate 111 and the bottom plate 112 forms the heavy oil reservoir cavity 200.

[0061] In order to ensure that the temperature of the mixture of quartz sand and heavy oil filled in the heavy oil reservoir cavity 200 within the reservoir simulation container 10 reaches the temperature of the simulated reservoir, the experimental box 1 is a heating thermostat for heating the reservoir simulation container 10 therein. Specifically, the heating thermostat is a split-type thermostat.

[0062] In order to facilitate the movement of the experimental box 1 , the experimental box 1 is provided with a vehicle body 12 .

[0063] refer to Figure 6 A flip bracket 121 is provided on each side of the vehicle body 12; a rotating shaft 122 is provided on the two flip brackets 121; the experimental box 1 is provided on the rotating shaft 122 and can rotate as the rotating shaft 122 rotates.

[0064] The flip bracket 121 is used to rotate the experimental box 1 to drive the reservoir simulation container 10 to rotate.

[0065] Specifically, the reservoir simulation container 10 is made of stainless steel.

[0066] Furthermore, the reservoir simulation container 10 is provided with a cover plate, which is fixed to the reservoir simulation container 10 by bolts, and a rubber ring is used to seal the cover plate and the reservoir simulation container 10 .

[0067] Specifically, the top plate 111 and the bottom plate 112 are made of stainless steel.

[0068] Specifically, the top plate 111 and the bottom plate 112 are fixed to the inner wall of the reservoir simulation container 10 via fixing plates 13 , respectively.

[0069] More specifically, a fixing hole 130 is respectively provided on both sides of the bottom of the top plate 111 and on both sides of the top of the bottom plate 112, and each fixing hole 130 is configured with a fixing plate 13. The fixing holes 130 on both sides of the bottom of the top plate 111 and on both sides of the top of the bottom plate 112 are respectively fixed to the upper sides and lower sides of the inner wall of the reservoir simulation container 10 through the fixing plates 13.

[0070] In order to monitor the internal temperature of the heavy oil reservoir, a plurality of temperature probes 14 are inserted into the heavy oil reservoir cavity 200. Each temperature probe 14 is arranged in parallel and evenly spaced in the heavy oil reservoir cavity 200. Figure 2 、 Figure 3 and Figure 6 Specifically, the temperature probe 14 is parallel to the top plate 111 and the bottom plate 112 .

[0071] In order to produce and inject high-temperature steam, the experimental device also includes a steam injection system 2.

[0072] refer to Figure 7 The steam injection system 2 includes a steam pipe 20, a distilled water container 21, a distilled water constant speed and pressure pump 22 and a steam generator 23.

[0073] The outlet of the distilled water container 21 is connected to the inlet of the distilled water constant speed and constant pressure pump 22 through a pipeline;

[0074] The outlet of the distilled water constant speed and constant pressure pump 22 is connected to the inlet of the steam generator 23 through a pipeline;

[0075] The outlet of the steam generator 23 is connected to the inlet of the steam pipe 20;

[0076] The outlet of the steam pipe 20 is connected to the steam pipe interface 201 .

[0077] In order to form top water and bottom water and inject the top water and bottom water into the heavy oil reservoir cavity 200 , the experimental device further includes a top water and bottom water injection system 3 .

[0078] refer to Figure 8 The top water and bottom water injection system 3 includes a top water pipe 303 and a bottom water pipe 302, a formation water container 31, a top water constant speed and pressure pump 321, a bottom water constant speed and pressure pump 322, a top water intermediate container 331, and a bottom water intermediate container 332.

[0079] The outlet of the formation water container 31 is connected to the inlet of the top water constant speed and pressure pump 321 and the bottom water constant speed and pressure pump 322 through pipelines.

[0080] The outlet of the top water constant speed and constant pressure pump 321 is connected to the inlet of the top water intermediate container 331, the water outlet of the top water intermediate container 331 is connected to the inlet of the top water pipe 303, and the outlet of the top water pipe 303 is connected to the top water interface 101;

[0081] The outlet of the bottom water constant speed and constant pressure pump 322 is connected to the water inlet of the bottom water intermediate container 332, the outlet of the bottom water intermediate container 332 is connected to the inlet of the bottom water pipe 302, and the outlet of the bottom water pipe 302 is connected to the bottom water interface 301.

[0082] In order to facilitate control, a valve is provided on the pipe connecting the outlet of the top water constant speed and pressure pump 321 and the inlet of the top water intermediate container 331; a valve is provided on the pipe connecting the outlet of the bottom water constant speed and pressure pump 322 and the water inlet of the bottom water intermediate container 332. Figure 8 shown.

[0083] In order to record the temperature change inside the heavy oil reservoir cavity 200 during the experiment, continue to refer to Figure 1 The experimental device further includes a data acquisition system 4, which includes a computer, and a plurality of temperature probes 14 are respectively connected to the computer.

[0084] In order to collect the waste liquid, the experimental device also includes a recovery system 5, which is further referred to Figure 1 The recovery system 5 includes a recovery pipe and a measuring cylinder. The heavy oil reservoir cavity 200 of the reservoir simulation container 10 is equipped with a drain port. The water inlet end of the recovery pipe is connected to the drain port of the reservoir simulation container 10. The measuring cylinder is arranged below the water outlet end of the recovery pipe. A back pressure valve and a flow meter are provided on the recovery pipe.

[0085] The experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water disclosed in the utility model can not only simulate the effects of the top water layer and the bottom water layer on the heavy oil reservoir, but also inject high-temperature steam at a constant rate through the steam injection system 2 after the two-dimensional thermal recovery model is filled and saturated, and measure the liquid production conditions at different production stages through the recovery system 5. In addition, the experimental device can also simulate various working conditions such as steam huff and puff, steam flooding and SAGD in heavy oil reservoirs with top water and bottom water, and conduct research on these simulation processes.

[0086] Example 2: An experimental method for simulating thermal recovery of a heavy oil reservoir under the influence of top and bottom water layers

[0087] Example 2 of the present invention provides an experimental device for simulating the thermal recovery process of a heavy oil reservoir under the action of top water and bottom water. Using the above experimental device, the experimental method includes the following steps:

[0088] 1. Experimental Preparation

[0089] Experimental supplies: heavy oil, quartz sand, formation water and distilled water;

[0090] The experimental instruments are connected and installed according to the experimental device diagram, and the top plate and bottom plate are placed and fixed in advance inside the reservoir simulation container 10 to form a top water cavity 100, a heavy oil reservoir cavity 200 and a bottom water cavity 300.

[0091] 2. Top and bottom water simulation

[0092] According to the experimental design requirements, the formation water is placed in the formation water container 31, the formation water container 31, the top water constant speed and pressure pump 321, the bottom water constant speed and pressure pump 322, the top water intermediate container 331, and the bottom water intermediate container 332 are connected, and the top plate 111 and the bottom plate 112 are pre-fixed inside the reservoir simulation container 10.

[0093] 3. 2D model filling

[0094] The heavy oil and quartz sand are mixed in proportion in advance and filled into the heavy oil reservoir cavity 200; after filling, the cover plate is compacted and sealed with cover plate bolts, and a rubber ring is used to seal the cover plate and the reservoir simulation container 10.

[0095] 4. Heavy Oil SAGD Experiment

[0096] Preparation stage: The reservoir simulation container 10 inside the experimental box 1 is heated so that the temperature of the mixture of quartz sand and heavy oil filled in the heavy oil reservoir cavity 200 in the reservoir simulation container 10 reaches the temperature of the simulated reservoir. The steam injection system 2 is used to preheat the steam generator 23 to produce high-temperature steam under the conditions required for the experiment.

[0097] SAGD preheating stage: high-temperature steam is injected into the heavy oil reservoir cavity 200, and the temperature change inside the heavy oil reservoir cavity 200 is monitored by the temperature probe 14 during the experiment until the temperature between the injection and production wells reaches the critical flow temperature;

[0098] SAGD production phase: high-temperature steam is injected at a constant rate, and the pressure at the production end of the oil well is controlled by a back-pressure valve. During this period, the liquid production status at the production end is continuously recorded, and the dynamic changes in the steam chamber are observed by recording the temperature and pressure change data.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An experimental device for simulating thermal recovery process of heavy oil reservoir under the action of top water and bottom water, characterized in that: The invention comprises an experimental box (1), wherein a reservoir simulation container (10) is loaded in the experimental box (1); The reservoir simulation container (10) is provided with a top water cavity (100), a heavy oil reservoir reservoir cavity (200), and a bottom water cavity (300) in order from top to bottom, and the top water cavity (100) is communicated with the heavy oil reservoir reservoir cavity (200) via an upper channel, and the bottom water cavity (300) is communicated with the heavy oil reservoir reservoir cavity (200) via a lower channel; The top water cavity (100), the heavy oil reservoir chamber (200) and the bottom water cavity (300) are respectively provided with a top water interface (101), a steam pipe interface (201) and a bottom water interface (301).

2. The experimental device according to claim 1, characterized in that The heavy oil reservoir cavity (200) is filled with a mixture of quartz sand and heavy oil to simulate a heavy oil reservoir; The top water interface (101) is used to receive top water, and the bottom water interface (301) is used to receive bottom water. The process of top water entering the heavy oil reservoir cavity (200) through the top water cavity (100) and the process of bottom water entering the heavy oil reservoir cavity (200) through the bottom water cavity (300) are used to simulate the effects of the top water layer and the bottom water layer on the heavy oil reservoir, respectively. The steam pipe interface (201) is used for connecting steam, and the process of steam flowing through the mixture of quartz sand and heavy oil in the heavy oil reservoir cavity (200) is used to simulate the thermal recovery process of the heavy oil reservoir.

3. The experimental device according to claim 1, characterized in that The top water cavity (100) is separated from the heavy oil reservoir reservoir cavity (200) by a top plate (111), and the top plate (111) is provided with at least one water inlet hole (113) on a side facing the top water cavity (100), and is provided with a plurality of water outlet holes (114) on a side facing the heavy oil reservoir reservoir cavity (200), and the plurality of water outlet holes (114) of the top plate (111) are respectively connected to the water inlet holes (113), thereby forming the upper channel; The heavy oil reservoir reservoir cavity (200) and the bottom water cavity (300) are separated by a bottom plate (112), and the bottom plate (112) is provided with at least one water inlet hole (113) on a side facing the bottom water cavity (300), and is provided with a plurality of water outlet holes (114) on a side facing the heavy oil reservoir reservoir cavity (200), and the plurality of water outlet holes (114) of the bottom plate (112) are respectively connected to the water inlet holes (113), thereby forming the lower channel.

4. The experimental device according to claim 1, characterized in that The experimental box (1) is equipped with a vehicle body (12), A flip bracket (121) is provided on each side of the vehicle body (12); A rotating shaft (122) is provided on the two flip brackets (121); The experimental box (1) is arranged on the rotating shaft (122) and can rotate as the rotating shaft (122) rotates.

5. The experimental device according to claim 1, characterized in that: The experimental box (1) is a heating constant temperature box.

6. The experimental device according to claim 1, characterized in that A plurality of temperature probes (14) are inserted into the heavy oil reservoir cavity (200), and each temperature probe (14) is arranged in parallel and evenly spaced relation within the heavy oil reservoir cavity (200) for detecting the internal temperature of the heavy oil reservoir.

7. The experimental device according to claim 1, characterized in that It also includes a steam injection system (2), which includes a steam pipe (20), a distilled water container (21), a distilled water constant speed and constant pressure pump (22) and a steam generator (23). The outlet of the distilled water container (21) is connected to the inlet of the distilled water constant speed and constant pressure pump (22) through a pipeline; The outlet of the distilled water constant speed and constant pressure pump (22) is connected to the inlet of the steam generator (23) through a pipeline; The outlet of the steam generator (23) is connected to the inlet of the steam pipe (20); The outlet of the steam pipe (20) is connected to the steam pipe interface (201).

8. The experimental device according to claim 1, characterized in that: Also includes top water and bottom water injection system (3), The top water and bottom water injection system (3) comprises a top water pipe (303) and a bottom water pipe (302), a formation water container (31), a top water constant speed and constant pressure pump (321), a bottom water constant speed and constant pressure pump (322), a top water intermediate container (331), and a bottom water intermediate container (332). The outlet of the formation water container (31) is connected to the inlet of the top water constant speed and constant pressure pump (321) and the bottom water constant speed and constant pressure pump (322) through pipelines. The outlet of the top water constant speed constant pressure pump (321) is connected to the inlet of the top water intermediate container (331), the water outlet of the top water intermediate container (331) is connected to the inlet of the top water pipe (303), and the outlet of the top water pipe (303) is connected to the top water interface (101); The outlet of the bottom water constant speed and constant pressure pump (322) is connected to the water inlet of the bottom water intermediate container (332), the outlet of the bottom water intermediate container (332) is connected to the inlet of the bottom water pipe (302), and the outlet of the bottom water pipe (302) is connected to the bottom water interface (301).

9. The experimental device according to claim 1, characterized in that: Also includes a data acquisition system (4), The data acquisition system (4) includes a computer, and a plurality of temperature probes (14) are respectively connected to the computer.

10. The experimental device according to claim 1, characterized in that: It also includes a recovery system (5), which includes a recovery tube and a measuring cylinder, The heavy oil reservoir cavity (200) of the reservoir simulation container (10) is provided with a drain port, the water inlet end of the recovery pipe is connected to the drain port of the reservoir simulation container (10), and the measuring cylinder is arranged below the water outlet end of the recovery pipe; The recovery pipe is provided with a back pressure valve and a flow meter.

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