Experimental device and method for displacement simulation by adopting real rock core

Abstract

The invention aims to provide an experimental device and method for performing displacement simulation by adopting a real rock core. The technical problems that a rock model is adopted for displacement, the accuracy of an experimental result is doubted, and a real rock sample is adopted for displacement, and the distribution condition of water and crude oil in the rock sample in the water flooding and displacement agent displacement process cannot be monitored are solved. In order to achieve the purpose, the invention provides the experimental device for displacement simulation by adopting the real rock core, and the experimental device is characterized by comprising a sample assembly, a clamping mechanism, a liquid injection mechanism and a liquid outlet mechanism, the sample assembly comprises a rock sample and a rock model insert block, a plurality of notches are formed in the rock sample, the notches are filled with the rock model insert block, observation holes are formed in the bottoms of the notches, a plurality of open holes are further formed in the rock sample, and injection-production pipes are embedded in the open holes; the proportion of the rock model insert block to the volume in the sample assembly is lower than 5%.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum development, and in particular to an experimental device and method for performing displacement simulation using a real rock core. Background Art

[0002] In the prior art, two methods are generally used for displacement simulation research. The first method is to use a transparent rock model to visualize the displacement simulation process (such as the Chinese invention patent with application number CN201911329890.X). Although the first method can visualize the displacement process, the pore throat structure in the rock model is different from the pore throat structure of the real core. Therefore, the accuracy of the experimental results of the displacement simulation experiment using the rock model is questionable;

[0003] The second method is to use real rock samples to simulate the displacement process (such as the Chinese invention patent with application number CN201810097791.2). The second method can only obtain the oil displacement volume of water drive and displacing agent, but cannot monitor the distribution of water and crude oil in the rock sample during the water drive and displacing agent process, which is not conducive to studying the mechanism of water drive and displacing agent process.

[0004] Therefore, it is an urgent technical problem to provide an experimental device and method for displacement simulation using real cores in the field of oil development technology. Summary of the invention

[0005] The purpose of the present invention is to provide an experimental device and method for displacement simulation using real rock cores, so as to solve the technical problems in the prior art that the accuracy of experimental results is questionable when using rock models for displacement, and the distribution of water and crude oil in rock samples cannot be monitored during water flooding and displacement agent displacement when using real rock samples for displacement.

[0006] To achieve the above object, the solution of the present invention is to provide an experimental device for displacement simulation using a real core, characterized in that it includes: a sample assembly, a clamping mechanism, a liquid injection mechanism and a liquid discharge mechanism;

[0007] The sample assembly includes a rock sample and a rock model insert. The rock sample is provided with a plurality of notches, which are filled with the rock model inserts. An observation hole is provided at the bottom of the notches. The rock sample is also provided with a plurality of openings, in which injection and production pipes are embedded. The rock model inserts account for less than 5% of the volume of the sample assembly. Since the total volume of all the rock model inserts is relatively small relative to the volume of the rock sample, embedding the rock model inserts in the rock sample will not significantly change the pore throat structure in the rock sample, and thus will not significantly affect the test results.

[0008] The sample assembly is clamped by the clamping mechanism, and the injection mechanism is used to inject crude oil, water and displacement agent into the sample assembly respectively, and the injection mechanism is connected to at least one of the injection and production pipes;

[0009] The liquid outlet mechanism comprises a liquid outlet pipe and a collector, one end of the liquid outlet pipe is connected to at least one of the injection and production pipes, and the other end of the liquid outlet pipe is connected to the inlet of the collector; preferably, the crude oil is dyed with Sudan red reagent, and the water is dyed with bromophenol blue reagent.

[0010] Further, the injection mechanism includes an injection pipe, a first intermediate container, a second intermediate container, a third intermediate container, a first plunger pump, a second plunger pump and a third plunger pump, the injection pipe includes a liquid inlet end and a liquid outlet end, the liquid outlet end of the injection pipe is connected to at least one of the injection and production pipes, the first intermediate container is used to load crude oil, the outlet of the first intermediate container is connected to the liquid inlet end of the injection pipe, the second intermediate container is used to load water, the outlet of the second intermediate container is connected to the liquid inlet end of the injection pipe, the third intermediate container is used to load a displacement agent, the outlet of the third intermediate container is connected to the liquid inlet end of the injection pipe, the first plunger pump is used to drive the crude oil in the first intermediate container into the injection pipe, the second plunger pump is used to drive the water in the second intermediate container into the injection pipe, and the third plunger pump is used to drive the displacement agent in the third intermediate container into the injection pipe; preferably, a first pressure detection component is provided on the injection pipe.

[0011] Furthermore, the clamping mechanism includes a mounting plate, a fixed clamping plate, a movable clamping plate and a position adjustment member, the fixed clamping plate is fixed on the mounting plate, a first card slot is fixed on the fixed clamping plate, the movable clamping plate is slidably arranged on the mounting plate, a second card slot is fixed on the movable clamping plate, the position adjustment member is connected to the movable clamping plate and is used to drive the movable clamping plate to move along the mounting plate, the movable clamping plate is parallel to the fixed clamping plate, one end of the sample assembly is inserted into the first card slot and the other end is inserted into the second card slot, so that the sample assembly is parallel to the mounting plate.

[0012] Furthermore, it also includes a detection mechanism, which includes a shelf, a plurality of light sources, a frame, a camera and a processor, the shelf is fixed on the fixed clamp and is located below the sample assembly, each of the light sources is fixed on the shelf, the light source faces the sample assembly, the lower end of the frame is fixedly connected to the fixed clamp, the frame is provided with the camera, the camera is arranged above the sample assembly and arranged toward the sample assembly, and the camera is electrically connected to the processor.

[0013] Furthermore, it also includes an inclination adjustment mechanism, which includes a base plate, a support rod and a telescopic adjustment member, one end of the support rod is hinged to the base plate, and the other end of the support rod is fixedly connected to the mounting plate, and the telescopic adjustment member includes a rotating block, an elongated nut and a second screw rod, one end of the rotating block is hinged to the mounting plate, the other end of the rotating block is rotatably connected to one end of the elongated nut, the other end of the elongated nut is threadedly connected to one end of the second screw rod, and the other end of the second screw rod is hinged to the base plate.

[0014] Furthermore, the position adjustment component includes a fixed block, a guide shaft and a first screw, the fixed block is fixed to the mounting plate, a screw hole and a guide hole are provided on the fixed block, the guide shaft is slidably inserted in the guide hole, the first screw is threadedly connected to the screw hole, and one end of the first screw is rotatably connected to the movable clamp.

[0015] Furthermore, the injection mechanism also includes a first injection valve, a second injection valve and a third injection valve, the first injection valve is arranged on the outlet of the first intermediate container, the second injection valve is arranged on the outlet of the second intermediate container, and the third injection valve is arranged on the outlet of the third intermediate container.

[0016] Furthermore, the liquid outlet mechanism also includes a liquid outlet valve, a back pressure valve and a back pressure pump, the liquid outlet valve is arranged on the liquid outlet pipe, the inlet of the back pressure valve is connected to the liquid outlet pipe, the outlet of the back pressure valve is connected to the inlet of the collector, and the outlet of the back pressure pump is connected to the pressure input end of the back pressure valve; preferably, a second pressure detection component is arranged on the liquid outlet pipe.

[0017] A method of an experimental device for displacement simulation using a real core, characterized by comprising:

[0018] (1) Sample assembly preparation: First, prepare a rectangular rock sample, open several observation holes and openings on the rock sample, and prepare several observation holes.

[0019] The rock model blocks are made of transparent materials and have pores connected to the outside world. Each rock model block is respectively embedded in each of the observation holes. At the same time, the injection and production pipes are embedded in each of the openings. Then, waterproof glue is applied on the surface of the rock sample, and the rock sample is sealed by a transparent cover plate.

[0020] (2) Pipeline connection: connecting the injection pipe to one or more injection and sampling pipes on the sample assembly, connecting the liquid outlet pipe to one or more other injection and sampling pipes, and plugging the remaining injection and sampling pipes with plugs;

[0021] (3) Oil saturation process: The crude oil in the first intermediate container is driven by the first plunger pump to enter the sample assembly through the injection pipe. When the crude oil is discharged from the outlet pipe, the oil injection is stopped. At this time, the sample assembly is saturated with oil. It is observed whether each rock model block contains oil, and a first crude oil distribution map is drawn when the crude oil is saturated;

[0022] (4) Water flooding process: The water in the second intermediate container is driven by the second plunger pump to enter the sample assembly through the injection pipe. When the liquid discharged from the outlet pipe does not contain crude oil, the water flooding is stopped. At this time, some crude oil will still remain in the sample assembly. It is observed whether each rock model block contains crude oil and water, and a second crude oil distribution map and a first water distribution map after water flooding are drawn.

[0023] (5) Displacement agent flooding process: the displacement agent in the third intermediate container is driven by the third plunger pump to enter the sample assembly through the injection pipe, and the volume of crude oil in the liquid discharged through the liquid outlet pipe is measured. At the same time, whether each rock model block contains crude oil and water is observed, and the third crude oil distribution map and the second water distribution map after the displacement agent flooding are drawn;

[0024] (6) Prepare another sample assembly, change the type of displacing agent, and repeat steps (1) to (5) to evaluate the oil displacement effects of different displacing agents.

[0025] Advantages of the present invention:

[0026] (1) By evenly opening a number of observation holes on the rock sample and embedding transparent rock model blocks in the observation holes, when the fluid flows in the pores of the rock sample during the displacement simulation experiment, when it encounters the rock model blocks on its moving path, it can directly pass through the pores in the rock model blocks. Since the total volume of all rock model blocks is relatively small compared to the volume of the rock sample, embedding the rock model blocks in the rock sample will not significantly change the pore throat structure in the rock sample, and thus will not have a significant impact on the test results. Compared with the displacement simulation experiment using the rock model, the accuracy of the displacement test results is improved. At the same time, by observing the fluid type in the pores of each rock model block, the fluid type at each observation hole position can be judged, so as to facilitate the drawing of the distribution map of various fluids on the rock sample during the test, providing data support for studying the mechanism of water flooding and displacement agent displacement process. (2) By using the real rock sample as the main body of the sample assembly and embedding the transparent rock model insert into the real rock sample, the experimental results can be more accurate and the displacement process of crude oil and water in the rock sample can be observed through the transparent rock model insert. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the structure of an experimental device for displacement simulation using a real core provided by the present invention;

[0028] Figure 2 yes Figure 1 The schematic diagram of the structure of the experimental device using real core for displacement simulation after omitting the injection mechanism and the discharge mechanism;

[0029] Figure 3 yes Figure 2 A partial enlarged view of the middle area A;

[0030] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the sample assembly;

[0031] Figure 5 yes Figure 4 Exploded view of the sample assembly in;

[0032] As shown in the figure, 1-sample assembly, 11-rock sample, 111-observation hole, 112-opening hole, 12-rock model insert, 13-injection and production pipe, 14-cover plate, 2-clamping mechanism, 21-mounting plate, 22-fixed splint, 221-first slot, 23-movable splint, 231-second slot, 24-position adjustment member, 241-fixed block, 242-guide shaft, 243-first screw, 3-injection mechanism, 31-injection pipe, 32-first intermediate container, 321-first injection valve, 33-second intermediate container, 331-second injection valve, 34-first Three intermediate containers, 341-the third liquid injection valve, 35-the first plunger pump, 36-the second plunger pump, 37-the third plunger pump, 38-the first pressure detection component, 4-the liquid outlet mechanism, 41-the liquid outlet pipe, 42-the collector, 43-the second pressure detection component, 44-the liquid outlet valve, 45-the back pressure valve, 46-the back pressure pump, 5-the inclination adjustment mechanism, 51-the bottom plate, 52-the support rod, 53-the telescopic adjustment component, 531-the rotating block, 532-the long nut, 533-the second screw, 6-the detection mechanism, 61-the shelf, 62-the light source, 63-the frame, 64-the camera component. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] An experimental device for displacement simulation using a real core comprises a sample assembly 1, a clamping mechanism 2, a liquid injection mechanism 3 and a liquid discharge mechanism 4.

[0035] The sample assembly 1 includes a rock sample 11 and a rock model insert 12. The rock sample 11 is evenly provided with a plurality of observation holes 111. The rock sample 11 is also provided with a plurality of openings 112. Injection and production pipes 13 are embedded in the openings 112. The injection and production pipes 13 are used to simulate injection and production wells during actual development. The rock model inserts 12 are embedded one by one in the corresponding observation holes 111.

[0036] The clamping mechanism 2 is used to clamp the rock sample 11. The injection mechanism 3 includes an injection pipe 31, a first intermediate container 32, a second intermediate container 33, a third intermediate container 34, a first plunger pump 35, a second plunger pump 36 and a third plunger pump 37. One end of the injection pipe 31 is connected to at least one of the injection and production pipes 13. The first intermediate container 32 is used to load crude oil dyed with Sudan red reagent. The outlet of the first intermediate container 32 is connected to the other end of the injection pipe 31. The second intermediate container 33 is used to load water dyed with bromophenol blue reagent. The outlet of the intermediate container 33 is connected to the other end of the injection pipe 31, the third intermediate container 34 is used to load the displacing agent, the outlet of the third intermediate container 34 is connected to the other end of the injection pipe 31, the first plunger pump 35 is used to drive the crude oil in the first intermediate container 32 into the injection pipe 31, the second plunger pump 36 is used to drive the water in the second intermediate container 33 into the injection pipe 31, and the third plunger pump 37 is used to drive the displacing agent in the third intermediate container 34 into the injection pipe 31.

[0037] The liquid outlet mechanism 4 includes a liquid outlet pipe 41 and a collector 42 . One end of the liquid outlet pipe 41 is connected to at least one of the injection and production pipes 13 , and the other end of the liquid outlet pipe 41 is connected to an inlet of the collector 42 .

[0038] The technical solution provided by the present invention is to evenly open a plurality of observation holes 111 on a rock sample 11, and embed a transparent rock model insert 12 in the observation hole 111, so that when a displacement simulation experiment is conducted, when a fluid flows in the pores in the rock sample 11, when it encounters a rock model insert 12 on its moving path, it can directly pass through the pores in the rock model insert 12. Since the total volume of all rock model inserts 12 is relatively small relative to the volume of the rock sample 11, embedding the rock model insert 12 in the rock sample 11 will not significantly change the pore throat structure in the rock sample 11, and thus will not significantly affect the test results, thereby improving the accuracy of the displacement test results compared to the displacement simulation experiment using a rock model; at the same time, by observing the fluid type in the pores of each rock model insert 12, the fluid type at the position of each observation hole 111 can be judged, thereby facilitating the drawing of a distribution map of various fluids on the rock sample 11 during the test, providing data support for studying the mechanism of water flooding and displacement agent displacement process.

[0039] In order to realize the function of the clamping mechanism 2, please refer to Figure 1-Figure 3 In a preferred embodiment, the clamping mechanism 2 includes a mounting plate 21, a fixed clamping plate 22, a movable clamping plate 23 and a position adjusting member 24. The fixed clamping plate 22 is fixed on the mounting plate 21. A first clamping groove 221 is fixed on the fixed clamping plate 22. The movable clamping plate 23 is slidably arranged on the mounting plate 21. A second clamping groove 231 is fixed on the movable clamping plate 23. The position adjusting member 24 is connected to the movable clamping plate 23 and is used to drive the movable clamping plate 23 to move. One end of the rock sample 11 is used to be clamped into the first clamping groove 221, and the other end of the rock sample 11 is used to be clamped into the second clamping groove 231. When in use, firstly, one end of the rock sample 11 is clamped into the first clamping groove 221, and then the movable clamping plate 23 is driven to move toward the fixed clamping plate 22 by the position adjusting member 24 until the second clamping groove 231 on the movable clamping plate 23 is completely clamped into the other end of the rock sample 11.

[0040] In order to realize the function of the position adjusting member 24, please refer to Figure 1-Figure 3In a preferred embodiment, the position adjustment member 24 includes a fixed block 241, a guide shaft 242 and a first screw 243. The fixed block 241 is fixed on the mounting plate 21. A screw hole and a guide hole are provided on the fixed block 241. The guide shaft 242 is slidably inserted in the guide hole. The first screw 243 is threadedly connected in the screw hole. One end of the first screw 243 is rotatably connected to the movable splint 23. During use, when the movable splint 23 needs to be moved, the first screw 243 is rotated so that the first screw 243 moves toward the direction of the fixed splint 22, thereby driving the movable splint 23 to move toward the direction of the fixed splint 22. The function of the guide shaft 242 is to prevent the movable splint 23 from rotating.

[0041] In order to simulate the inclination of the actual formation, please refer to Figure 1 and Figure 2 In a preferred embodiment, the experimental device for displacement simulation using a real core also includes an inclination adjustment mechanism 5, the inclination adjustment mechanism 5 includes a base plate 51, a support rod 52 and a telescopic adjustment member 53, one end of the support rod 52 is hinged to the base plate 51, the other end of the support rod 52 is fixedly connected to the mounting plate 21, the telescopic adjustment member 53 includes a rotating block 531, a long nut 532 and a second screw 533, one end of the rotating block 531 is hinged to the mounting plate 21, the other end of the rotating block 531 is rotatably connected to one end of the long nut 532, and the other end of the long nut 532 is fixedly connected to the mounting plate 21. It is threadedly connected to one end of the second screw rod 533, and the other end of the second screw rod 533 is hinged to the bottom plate 51. During use, when the inclination of the rock sample 11 needs to be adjusted, the long nut 532 is rotated, and the total length of the long nut 532 and the second screw rod 533 changes, so that the total length of the telescopic adjustment member 53 changes, so that the inclination of the mounting plate 21 changes, thereby changing the inclination of the rock sample 11, so that the inclination of the rock sample 11 is consistent with the inclination of the actual research reservoir, so as to be more in line with the displacement process of the actual reservoir. At the same time, by changing the inclination of the rock sample 11, the influence of the inclination of the rock sample 11 on the displacement process can be studied.

[0042] In order to quickly obtain the fluid type in each rock model block 12, please refer to Figure 1-Figure 3In a preferred embodiment, the experimental device for displacement simulation using a real core further includes a detection mechanism 6, the detection mechanism 6 includes a shelf 61, a plurality of light sources 62, a frame 63, a camera 64 and a processor, the shelf 61 is fixed on the fixed clamping plate 22 and is located below the rock sample 11, each of the light sources 62 is fixed on the shelf 61, the lower end of the frame 63 is fixedly connected to the fixed clamping plate 22, the upper end of the frame 63 is connected to the camera 64, the camera 64 is arranged above the rock sample 11 and is arranged toward the rock sample 11, the camera 64 The processor is electrically connected to the processor. When in use, if the type of fluid in each rock model block 12 is observed manually one by one, the efficiency will be low. Therefore, in this embodiment, white light is emitted upward by the light source 62, and the white light is sensed by the camera 64 after passing through each rock model block 12. When the white light passes through each rock model block 12, if the rock model block 12 contains crude oil, the emitted light is red, and if the rock model block 12 contains water, the emitted light is blue. Therefore, the color of each rock model block 12 can be judged according to the photos taken by the camera 64, and the type of fluid in each rock model block 12 can be judged accordingly.

[0043] To facilitate switching the type of fluid being injected, please refer to Figure 1 In a preferred embodiment, the injection mechanism 3 also includes a first injection valve 321, a second injection valve 331 and a third injection valve 341, the first injection valve 321 is arranged on the outlet of the first intermediate container 32, the second injection valve 331 is arranged on the outlet of the second intermediate container 33, and the third injection valve 341 is arranged on the outlet of the third intermediate container 34.

[0044] To facilitate the detection of injection pressure and discharge pressure, please refer to Figure 1 In a preferred embodiment, a first pressure detection component 38 is provided on the liquid injection tube 31 , and a second pressure detection component 43 is provided on the liquid outlet tube 41 .

[0045] In order to maintain a certain pressure in the rock sample 11, please refer to Figure 1In a preferred embodiment, the liquid outlet mechanism 4 further includes a liquid outlet valve 44, a back pressure valve 45 and a back pressure pump 46. The liquid outlet valve 44 is arranged on the liquid outlet pipe 41, the inlet of the back pressure valve 45 is communicated with the liquid outlet pipe 41, the outlet of the back pressure valve 45 is communicated with the inlet of the collector 42, and the outlet of the back pressure pump 46 is communicated with the pressure input end of the back pressure valve 45. When in use, the back pressure pump 46 is used to provide back pressure to the back pressure valve 45. When the pressure in the liquid outlet pipe 41 is less than the back pressure, the back pressure valve 45 is in a closed state. When the pressure in the liquid outlet pipe 41 is greater than the back pressure, the back pressure valve 45 is opened, so that a certain pressure can be maintained in the rock sample 11 to better simulate the actual formation conditions.

[0046] The present invention also provides an experimental method for displacement simulation using a real core, which is applicable to the experimental device for displacement simulation using a real core, and comprises the following steps:

[0047] (1) Preparation of rock samples: First, a rectangular rock sample 11 is prepared. A plurality of observation holes 111 and openings 112 are opened on the rock sample 11. In this embodiment, the number of openings 112 is two. At the same time, a plurality of rock model blocks 12 that match the observation holes 111 are prepared. The rock model blocks 12 are made of transparent material and have pores connected to the outside world (so that they are similar to actual rocks). Each rock model block 12 is respectively embedded in each of the observation holes 111. At the same time, an injection and production pipe 13 is embedded in each of the openings 112. Then, waterproof glue is applied to the surface of the rock sample 11, and the rock sample is sealed by a transparent cover plate 14.

[0048] (2) Pipeline connection: connect the injection pipe 31 to one or more injection and production pipes 13 on the rock sample, connect the liquid outlet pipe 41 to one or more other injection and production pipes 13, and plug the remaining injection and production pipes 13 with plugs;

[0049] (3) Oil saturation process: The first plunger pump 35 drives the crude oil in the first intermediate container 32 into the rock sample 11 through the injection pipe 31. When the crude oil is discharged from the outlet pipe 41, the oil injection is stopped. At this time, the rock sample 11 is saturated with oil. It is observed whether each rock model block 12 contains crude oil, and a first crude oil distribution map when the crude oil is saturated is drawn.

[0050] (4) Water flooding process: The water in the second intermediate container 33 is driven by the second plunger pump 36 to enter the rock sample 11 through the injection pipe 31. When the liquid discharged from the liquid outlet pipe 41 does not contain crude oil, the water flooding is stopped. At this time, some crude oil will still remain in the rock sample 11. It is observed whether each rock model block 12 contains crude oil and water, and the second crude oil distribution map and the first water distribution map after water flooding are drawn.

[0051] (5) Displacing agent flooding process: The displacing agent in the third intermediate container 34 is driven by the third plunger pump 37 to enter the rock sample 11 through the injection pipe 31, and the volume of crude oil in the liquid discharged through the liquid outlet pipe 41 is measured. At the same time, whether each rock model block 12 contains crude oil and water is observed, and a third crude oil distribution map and a second water distribution map after the displacing agent flooding are drawn;

[0052] (6) Prepare another rock sample 11, change the type of displacing agent, and repeat steps (1) to (5) to evaluate the oil displacement effects of different oil displacement agents.

[0053] In summary, the beneficial effects of the technical solution provided by the present invention are as follows:

[0054] (1) By evenly opening a plurality of observation holes 111 on the rock sample 11 and embedding transparent rock model inserts 12 in the observation holes 111, when the fluid flows in the pores of the rock sample 11 during the displacement simulation experiment, when it encounters the rock model inserts 12 on its moving path, it can directly pass through the pores in the rock model inserts 12. Since the total volume of all the rock model inserts 12 is relatively small relative to the volume of the rock sample 11, embedding the rock model inserts 12 in the rock sample 11 will not significantly change the pore throat structure in the rock sample 11, and thus will not significantly affect the test results. Compared with the displacement simulation experiment using the rock model, the accuracy of the displacement test results is improved. At the same time, by observing the fluid type in the pores of each rock model insert 12, the fluid type at the position of each observation hole 111 can be judged, so as to facilitate the drawing of the distribution map of various fluids on the rock sample 11 during the test, providing data support for studying the mechanism of water flooding and displacement agent displacement process.

[0055] (2) By using the real rock sample 11 as the main body of the sample assembly 1 and embedding the transparent rock model insert 12 into the real rock sample 11, the experimental results can be more accurate and the displacement process of crude oil and water in the rock sample can be observed through the transparent rock model insert 12.

[0056] (3) The inclination angle of the rock sample 11 can be changed by the inclination adjustment mechanism 5, thereby facilitating the study of the influence of the inclination angle of the rock sample 11 on the displacement process.

[0057] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An experimental device for displacement simulation using real cores, characterized in that: include: A sample assembly (1), a clamping mechanism (2), a liquid injection mechanism (3) and a liquid discharge mechanism (4); The sample assembly (1) comprises a rock sample (11) and a rock model insert (12); the rock sample (11) is provided with a plurality of notches, the notches are filled with the rock model insert (12), the bottoms of the notches are provided with observation holes (111), the rock sample (11) is further provided with a plurality of openings (112), injection and production tubes (13) are embedded in the openings (112); the proportion of the rock model insert (12) in the volume of the sample assembly (1) is less than 5%; The sample assembly (1) is clamped by the clamping mechanism (2), and the injection mechanism (3) is used to inject crude oil, water and displacement agent into the sample assembly (1) respectively, and the injection mechanism (3) is connected to at least one of the injection and production pipes (13); The liquid outlet mechanism (4) comprises a liquid outlet pipe (41) and a collector (42), one end of the liquid outlet pipe (41) is connected to at least one of the injection and production pipes (13), and the other end of the liquid outlet pipe (41) is connected to the inlet of the collector (42).

2. The experimental device for displacement simulation using real core according to claim 1, characterized in that: The liquid injection mechanism (3) comprises a liquid injection pipe (31), a first intermediate container (32), a second intermediate container (33), a third intermediate container (34), a first plunger pump (35), a second plunger pump (36) and a third plunger pump (37); the liquid injection pipe (31) comprises a liquid inlet end and a liquid outlet end; the liquid outlet end of the liquid injection pipe (31) is connected to at least one of the injection and production pipes (13); the first intermediate container (32) is used to load crude oil; the outlet of the first intermediate container (32) is connected to the liquid inlet end of the liquid injection pipe (31); the second intermediate container (33) is used to load water; the outlet of the second intermediate container (32) is connected to the liquid inlet end of the liquid injection pipe (31); The outlet of the intermediate container (33) is communicated with the liquid inlet end of the injection pipe (31); the third intermediate container (34) is used to load the displacement agent; the outlet of the third intermediate container (34) is communicated with the liquid inlet end of the injection pipe (31); the first plunger pump (35) is used to drive the crude oil in the first intermediate container (32) into the injection pipe (31); the second plunger pump (36) is used to drive the water in the second intermediate container (33) into the injection pipe (31); and the third plunger pump (37) is used to drive the displacement agent in the third intermediate container (34) into the injection pipe (31).

3. The experimental device for displacement simulation using real core according to claim 2, characterized in that: The clamping mechanism (2) comprises a mounting plate (21), a fixed clamping plate (22), a movable clamping plate (23) and a position adjusting member, wherein the fixed clamping plate (22) is fixed on the mounting plate (21), a first clamping groove (221) is fixed on the fixed clamping plate (22), the movable clamping plate (23) is slidably arranged on the mounting plate (21), a second clamping groove (231) is fixed on the movable clamping plate (23), the position adjusting member is connected to the movable clamping plate (23) and is used for driving the movable clamping plate (23) to move along the mounting plate (21), the movable clamping plate (23) is parallel to the fixed clamping plate (22), one end of the sample assembly (1) is clamped into the first clamping groove (221) and the other end is clamped into the second clamping groove (231), so that the sample assembly (1) is parallel to the mounting plate (21).

4. The experimental device for displacement simulation using real core according to claim 3, characterized in that: The invention also comprises a detection mechanism (6), wherein the detection mechanism (6) comprises a shelf (61), a plurality of light sources (62), a frame (63), a camera (64) and a processor. The shelf (61) is fixed on the fixed clamp (22) and is located below the sample assembly (1). Each of the light sources (62) is fixed on the shelf (61). The light sources (62) face the sample assembly (1). The lower end of the frame (63) is fixedly connected to the fixed clamp (22). The camera (64) is provided on the frame (63). The camera (64) is arranged above the sample assembly (1) and faces the sample assembly (1). The camera (64) is electrically connected to the processor.

5. The experimental device for displacement simulation using real core according to claim 4, characterized in that: The invention also comprises an inclination adjustment mechanism (5), wherein the inclination adjustment mechanism (5) comprises a base plate (51), a support rod (52) and a telescopic adjustment member (53), wherein one end of the support rod (52) is hinged to the base plate (51), and the other end of the support rod (52) is fixedly connected to the mounting plate (21), and the telescopic adjustment member (53) comprises a rotating block (531), a long nut (532) and a second screw rod (533), wherein one end of the rotating block (531) is hinged to the mounting plate (21), and the other end of the rotating block (531) is rotatably connected to one end of the long nut (532), and the other end of the long nut (532) is threadedly connected to one end of the second screw rod (533), and the other end of the second screw rod (533) is hinged to the base plate (51).

6. The experimental device for displacement simulation using real core according to claim 5, characterized in that: The position adjustment member comprises a fixed block (241), a guide shaft (242) and a first screw rod (243); the fixed block (241) is fixed on the mounting plate (21); a screw hole and a guide hole are provided on the fixed block (241); the guide shaft (242) is slidably inserted into the guide hole; the first screw rod (243) is threadedly connected to the screw hole; one end of the first screw rod (243) is rotatably connected to the movable clamping plate (23).

7. The experimental device for displacement simulation using real core according to claim 6, characterized in that: The liquid injection mechanism (3) further comprises a first liquid injection valve (321), a second liquid injection valve (331) and a third liquid injection valve (341); the first liquid injection valve (321) is arranged at the outlet of the first intermediate container (32); the second liquid injection valve (331) is arranged at the outlet of the second intermediate container (33); and the third liquid injection valve (341) is arranged at the outlet of the third intermediate container (34).

8. The experimental device for displacement simulation using real core according to claim 7, characterized in that: The liquid outlet mechanism (4) further comprises a liquid outlet valve (44), a back pressure valve (45) and a back pressure pump (46); the liquid outlet valve (44) is arranged on the liquid outlet pipe (41); the inlet of the back pressure valve (45) is connected to the liquid outlet pipe (41); the outlet of the back pressure valve (45) is connected to the inlet of the collector (42); and the outlet of the back pressure pump (46) is connected to the pressure input end of the back pressure valve (45).

9. An experimental device method for displacement simulation using real core according to any one of claims 1 to 8, characterized in that: include: (1) Sample assembly (1) Preparation: First, a rectangular rock sample (11) is prepared, and a plurality of observation holes (111) and openings (112) are opened on the rock sample (11). The rock model insert (12) is made of a transparent material and has a hole in the rock model insert (12) that is connected to the outside. Each rock model insert (12) is respectively embedded in each of the observation holes (111). At the same time, the injection and production pipe (13) is embedded in each of the openings (112). Then, waterproof glue is applied on the surface of the rock sample (11), and the rock sample (11) is sealed by a transparent cover plate (14); (2) Pipeline connection: connecting the injection pipe (31) to one or more injection and sampling pipes (13) on the sample assembly (1), connecting the liquid outlet pipe (41) to one or more other injection and sampling pipes (13), and plugging the remaining injection and sampling pipes (13) with plugs; (3) Oil saturation process: the crude oil in the first intermediate container (32) is driven by the first plunger pump (35) to enter the sample assembly (1) through the injection pipe (31). When the crude oil is discharged from the outlet pipe (41), the oil injection is stopped. At this time, the sample assembly (1) is saturated with oil. It is observed whether each rock model insert (12) contains crude oil, and a first crude oil distribution map is drawn when the crude oil is saturated; (4) Water flooding process: The water in the second intermediate container (33) is driven by the second plunger pump (36) to enter the sample assembly (1) through the injection pipe (31). When the liquid discharged from the liquid outlet pipe (41) does not contain crude oil, the water flooding is stopped. At this time, some crude oil will still remain in the sample assembly (1). It is observed whether each rock model block (12) contains crude oil and water, and a second crude oil distribution map and a first water distribution map after water flooding are drawn; (5) Displacing agent oil displacement process: the displacing agent in the third intermediate container (34) is driven by the third plunger pump (37) to enter the sample assembly (1) through the liquid injection pipe (31), and the volume of crude oil in the liquid discharged through the liquid outlet pipe (41) is measured. At the same time, it is observed whether each rock model block (12) contains crude oil and water, and a third crude oil distribution map and a second water distribution map after the displacing agent oil displacement are drawn; (6) Prepare another sample assembly (1), change the type of displacing agent, and repeat steps (1) to (5) to evaluate the oil displacement effects of different displacing agents.

Images