Reservoir salt sensitivity experiment equipment

Abstract

The invention relates to the technical field of sensitivity testing of reservoirs, in particular to reservoir salt sensitivity experimental equipment which comprises a cylinder internally provided with a hollow cavity used for containing a rock core module, and the hollow cavity penetrates through the bottom of the cylinder; the output shaft of the telescopic cylinder drives the scraping ring on the strong magnetic ring to move, so that fine particles and original fluid discharged from the core module are scraped, and further diffusion of the fine particles and the original fluid in a reservoir pore space and a throat outside a sample range under the actual working condition of the reservoir is simulated; epoxy resin does not need to be adopted for sealing an experimental sample, the situation that experimental equipment does not have the capacity of simulating the actual working condition of a reservoir stratum and cross contamination exists in the traditional salt sensitivity experimental process is avoided, the authenticity of an experimental result can be guaranteed, and finally fine particles and original fluid discharged from the upper end and the side end of the rock core module can be accurately measured. Medium flowing paths which are arranged in a staggered mode are captured by the chip capturing velvet rings respectively, so that the influence on stable measurement of the permeability is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of sensitivity testing of clastic rock reservoirs, and in particular to reservoir salt sensitivity experimental equipment. Background Art

[0002] When clastic oil and gas reservoirs come into contact with external fluids, their permeability often changes significantly when the reservoirs come into contact with brine of different mineralization levels. The salt sensitivity experiment tests the degree of permeability change, analyzes the degree of reservoir damage caused by salt sensitivity changes, finds out the conditions for salt sensitivity, and provides a basis for the rational design of various oil and gas related working fluids.

[0003] There are many types of devices for testing reservoir salt sensitivity. Among them, the latest Chinese patent application (application number CN202311206436.1) discloses an experimental device and method for evaluating the sensitivity of continental shale, including an axial pressure system, a displacement system, and a clamp. This invention solves the problem that shale reservoirs with low porosity and low permeability are difficult to displace, and can avoid the closure of internal bedding fractures in shale due to external forces, ensuring integrity. In actual reservoir salt sensitivity evaluation tests, after the working fluid filtrate with a salinity lower than that of formation water is displaced into the reservoir, it generally causes the clay to swell and disperse. The expansion and dispersion of the clay will cause the fine particles and the original fluid in the reservoir to further diffuse in the reservoir pore space and throat. However, the experimental samples in the above-mentioned experimental device are sealed with epoxy resin, which will prevent the diffusion of fine particles and original fluids in the pore space and throat of the reservoir. In addition, the epoxy resin that penetrates into the pores will also damage the experimental samples, causing the simulation results to deviate from the actual reservoir conditions, resulting in serious deviations in the experimental data results. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a reservoir salt-sensitivity experimental equipment to solve the technical problems that the prior art cannot guarantee the authenticity of the experimental data results and may cause cross-contamination of the experimental samples.

[0005] Based on the above purpose, the present invention provides a reservoir salt sensitivity experimental equipment, comprising:

[0006] A cylinder having a hollow cavity for accommodating a core module is provided inside, wherein the hollow cavity runs through the bottom of the cylinder;

[0007] A base detachably connected to the bottom of the cylinder, the base being used to seal the hollow cavity;

[0008] The device also includes:

[0009] A scraping ring with an inner diameter equal to that of the core module, after the core module is placed in the hollow cavity, a confining pressure cavity is formed between the core module and the inner wall of the hollow cavity, the scraping ring is sleeved on the outside of the core module, and the scraping ring is provided with flow channels penetrating the upper and lower end surfaces thereof;

[0010] A lifting part for driving the scraper ring to move up and down in the confining pressure chamber;

[0011] A closing block is arranged on the top wall of the hollow cavity. After the scraper ring moves to the position of the closing block, a pressure cavity is formed between the top surface of the scraper ring, the outer side surface of the closing block and the inner wall of the hollow cavity, and the pressure cavity is isolated from the confining pressure cavity.

[0012] An opening and closing part, a drainage channel is provided on one side of the pressure chamber, and the opening and closing part is used to open and close the drainage channel;

[0013] Used to generate suction on the pressure chamber after the discharge channel is opened, and absorb particles in the pressure chamber to the suction part in the discharge channel;

[0014] A displacement system for providing driving force for the saturation displacement process, wherein the displacement system injects medium into the core module through an injection port provided at the bottom of the base;

[0015] A liquid storage container, a liquid outlet pipe and a first valve arranged on the liquid outlet pipe, one end of the liquid outlet pipe is connected to the liquid storage container, the other end of the liquid outlet pipe is connected to an outlet arranged on the closing block, and the outlet is connected to the hollow cavity.

[0016] Furthermore, a strip opening is provided on one side of the scraper ring, and an extension block corresponding to the strip opening is provided on one side of the closing block. After the extension block enters the strip opening, the extension block closes the strip opening. A baffle cap is provided on the upper end surface of the scraper ring of the flow channel, and one side of the baffle cap is hinged to the edge of the flow channel for opening the baffle cap through the impact force of the medium in the confining pressure chamber when the scraper ring moves downward.

[0017] Furthermore, the lifting part includes:

[0018] A mounting seat, a fixing plate arranged on one side of the mounting seat, and a telescopic cylinder arranged on the fixing plate, wherein the base is used to be placed on the mounting seat;

[0019] A strong magnetic ring and a strong magnetic block connected to the output shaft of the telescopic cylinder, the telescopic cylinder is used to drive the strong magnetic block to move up and down, the strong magnetic ring is arranged on the scraping ring, and the strong magnetic block is used to generate attraction between the strong magnetic ring so that the movement state of the strong magnetic block and the strong magnetic ring is the same.

[0020] Furthermore, the suction part includes:

[0021] A connecting box is arranged at the top of the cylinder, wherein a connecting chamber is arranged in the connecting box, wherein the liquid discharge channel connects the connecting chamber with the pressure chamber, and a sinking chamber is also arranged on one side of the connecting box, wherein the sinking chamber is connected with the connecting chamber, and a liquid outlet is arranged at the bottom of the sinking chamber;

[0022] A filter plate disposed in the sinking cavity, wherein the filter plate is located between the liquid outlet and the communicating cavity;

[0023] A one-way valve is arranged on the liquid outlet and a connecting hose is connected to the liquid outlet at one end, a side inlet is arranged on the side surface of the cylinder and connected to the hollow cavity, and the other end of the connecting hose is connected to the side inlet;

[0024] A liquid inlet pipeline is connected to the medium outlet of the displacement system at one end, and the other end of the liquid inlet pipeline is connected to the communication cavity. An opening and closing valve is provided on the liquid inlet pipeline.

[0025] Furthermore, the filter plate is detachably arranged in the sinking cavity, and the upper surface of the filter holes on the filter plate is a concave structure, so that the particles are collected on the filter plate.

[0026] Further, the drainage channel includes a vertical channel and a horizontal channel, one end of the vertical channel is connected to the communication chamber, one side of the horizontal channel is connected to the pressure chamber, and the opening and closing part includes:

[0027] A plug connector, wherein the outer side surface of the cylinder is provided with a plug hole facing the horizontal channel, and the front end of the plug connector is provided with an insertion rod, the insertion rod is slidably connected with the plug hole, and after the insertion rod enters the horizontal channel, it is used to seal the horizontal channel;

[0028] A driving assembly for driving the connector to slide in the socket.

[0029] Furthermore, the driving assembly includes:

[0030] A tension spring provided on the insertion rod, one end of the tension spring being fixed to the outer side surface of the cylinder, and the other end of the tension spring being fixed to the insertion rod;

[0031] A lifting rod fixedly connected to the output shaft of the telescopic cylinder, one end of which is fixedly connected to the strong magnetic block;

[0032] A pushing block is arranged on the lifting rod, and the plug-in component is provided with a pushing hole penetrating its upper and lower surfaces. One side of the pushing hole is an inclined surface. When the pushing block enters the pushing hole, the plug-in rod extends out of the plug-in hole through the inclined surface to open the horizontal channel.

[0033] Furthermore, the upper end surface of the scraper ring is inclined, and the lowest point of the upper end surface of the scraper ring and the opening of the horizontal channel in the pressure chamber are located on the same vertical line.

[0034] Furthermore, the device also includes:

[0035] At least one capture box arranged on the connecting box, wherein a capture chamber is arranged in the capture box, and a through pipe is arranged at the bottom of the capture chamber;

[0036] A second valve disposed on the through pipe and a guide pipe connecting the through pipe and an outlet;

[0037] A capturing portion disposed in the capturing chamber, the capturing portion being used to capture particles;

[0038] The liquid outlet pipeline is connected with the liquid storage container and the capture chamber.

[0039] Further, the capture unit includes:

[0040] An arc-top filter cover is arranged at the bottom of the capture chamber, and a plurality of inclined holes are arranged on the top of the arc-top filter cover;

[0041] A debris catching velvet ring is arranged on the arc-shaped outer surface of the arc-top filter cover, and the inner side surface of the debris catching velvet ring is provided with velvet.

[0042] The beneficial effects of the present invention are as follows: a reservoir salt-sensitive experimental device of the present invention is adopted, and the scraping ring on the strong magnetic ring is driven to move by the output shaft of the telescopic cylinder to scrape off the fine particles and original fluid discharged from the core module, so as to simulate the actual working conditions of the reservoir, and the fine particles and original fluid further diffuse in the reservoir pore space and throat outside the sample range, and there is no need to use epoxy resin to seal the experimental sample, thereby avoiding the situation in which the experimental equipment does not have the ability to simulate the actual working conditions of the reservoir and the existence of cross contamination in the traditional salt-sensitive experiment process, and the authenticity of the experimental results can be guaranteed. Finally, the fine particles and original fluid discharged from the upper end and the side end of the core module are respectively captured by the scrap wool rings through the medium flow paths arranged in a staggered manner, so as to avoid affecting the stable measurement of permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 It is a structural schematic diagram of the present invention;

[0045] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0046] Figure 3 A top view of the closing block of the present invention;

[0047] Figure 4 It is a schematic diagram of the interior of the capture box of the present invention;

[0048] Figure 5 for Figure 2 A magnified view of the structure at center A;

[0049] Figure 6 for Figure 2 A magnified view of the structure at B in the middle;

[0050] Figure 7 It is a schematic diagram of the connection between the telescopic cylinder and the strong magnetic block in the present invention;

[0051] Figure 8 It is a schematic diagram of the assembly of the arc top filter cover and the debris catching velvet ring in the present invention;

[0052] Fig. 9 It is a schematic diagram of the assembly of the scraping ring and the strong magnetic ring in the present invention;

[0053] Fig.10 It is a schematic diagram of the flow direction of the medium fluid in the present invention.

[0054] The markings in the figure are:

[0055] 1. Core module; 2. Cylinder; 3. Base; 4. Scraper ring; 5. Closing block; 6. Drainage channel; 7. Injection port; 8. Liquid storage container; 9. Liquid outlet pipe; 10. First valve; 11. Strip opening; 12. Extension block; 13. Stop cap; 14. Mounting seat; 15. Fixing plate; 16. Telescopic cylinder; 17. Strong magnetic ring; 18. Strong magnetic block; 19. Connecting box; 20. Connecting chamber; 21. Sinking chamber; 22. Liquid outlet; 23. Filter plate; 24, one-way valve; 25, connecting hose; 26, side inlet; 27, liquid inlet pipe; 28, opening and closing valve; 29, plug-in connector; 30, socket; 31, plug rod; 32, tension spring; 33, lifting rod; 34, push block; 35, push hole; 36, capture box; 37, capture chamber; 38, through pipe; 39, second valve; 40, guide pipe; 42, arc top filter cover; 43, inclined hole; 44, debris catching ring; 45, displacement system. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0057] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0058] The embodiment of the present invention provides a reservoir salt sensitivity test device, such as Figure 1 , Figure 2 As shown, it includes a cylinder 2 with a hollow cavity for placing the core module 1, and the hollow cavity runs through the bottom of the cylinder 2;

[0059] A base 3 detachably connected to the bottom of the cylinder 2, the base 3 is used to seal the hollow cavity;

[0060] The equipment also includes:

[0061] A scraper ring 4 having an inner diameter equal to that of the core module 1. After the core module 1 is placed in the hollow cavity, a confining pressure cavity is formed between the core module 1 and the inner wall of the hollow cavity. The scraper ring 4 is sleeved on the outside of the core module 1, and the scraper ring 4 is provided with flow channels penetrating the upper and lower end surfaces thereof;

[0062] A lifting part for driving the scraper ring 4 to move up and down in the confining pressure chamber;

[0063] A closing block 5 is arranged on the top wall of the hollow cavity. After the scraper ring 4 moves to the position where the closing block 5 is located, a pressure chamber is formed between the top surface of the scraper ring 4, the outer side surface of the closing block 5 and the inner wall of the hollow cavity, and the pressure chamber and the confining pressure chamber are isolated from each other.

[0064] An opening and closing part, a drainage channel 6 is provided on one side of the pressure chamber, and the opening and closing part is used to open and close the drainage channel 6;

[0065] Used to generate suction on the pressure chamber after the discharge channel 6 is opened, and absorb the particles in the pressure chamber to the suction part in the discharge channel 6;

[0066] A displacement system 45 for providing driving force for the saturation displacement process, wherein the displacement system 45 injects medium into the core module 1 through an injection port 7 provided at the bottom of the base 3;

[0067] A liquid storage container 8, a liquid outlet pipe 9 and a first valve 10 arranged on the liquid outlet pipe 9, one end of the liquid outlet pipe 9 is connected to the liquid storage container 8, and the other end of the liquid outlet pipe 9 is connected to an outlet arranged on the closing block 5, and the outlet is connected to the hollow cavity.

[0068] The method of using the above reservoir salt sensitivity experimental equipment comprises the following steps:

[0069] S1. Sample preparation: Select representative reservoir rock samples to ensure that the selected core module 1 can represent the actual reservoir to avoid distortion of experimental results caused by sampling bias. Thoroughly clean the core module 1 to remove surface impurities and residual fluid attached, dry and cut into core columnar samples of appropriate size, and test the basic parameters of the sample such as initial permeability, porosity and mineral composition;

[0070] S2. Brine preparation: According to the experimental requirements, brine solutions with different mineralizations are prepared to cover the salinity range that may be encountered in the actual reservoir. The brine medium fluids with different mineralizations must ensure that the salt is completely dissolved without undissolved particles. Before injection, they should be fully stirred at a constant temperature to avoid salt precipitation caused by excessive local concentration;

[0071] S3, saturation displacement: the core module 1 sample is placed in the cylinder 2, and the core module 1 sample is subjected to a salt sensitivity test for reducing the salinity. The first level of brine is still formation water, and the salinity of the brine is gradually reduced according to a certain concentration difference until the salinity of the injected liquid is close to zero, and each concentration difference level is continued for 6-10 hours to ensure that the brine fully reacts with the reservoir minerals in the core module 1;

[0072] S4, permeability measurement: measuring the permeability of the core modules 1 on both sides under constant pressure, and recording the permeability data to verify the reliability of the experimental results;

[0073] S5. Data processing and analysis: Calculate the relative change rate of permeability at each concentration difference level, calculate the salt sensitivity index, and draw a curve of permeability versus salinity, analyze the salt sensitivity trend and critical salinity, so as to quantitatively evaluate the sensitivity of core module 1 to salt water.

[0074] Among them, in step S3, the specific process of placing the core module 1 sample in the cylinder 2 and saturation displacement is as follows:

[0075] The cylinder 2 and the base 3 are disassembled, and the core module 1 sample is placed in the hollow cavity. After the scraper ring 4 is positioned, the cylinder 2 and the base 3 are assembled to complete the sealing assembly of the core module 1, and then saturation displacement is performed, that is, the medium is injected into the core module 1 through the injection port 7 through the displacement system 45, and a confining pressure is formed on the core module 1 sample in the confining pressure cavity. Then, the scraper ring 4 is driven by the lifting part to perform a lifting movement in the confining pressure cavity. After the scraper ring 4 moves to the position where the closing block 5 is located, a pressure cavity is formed between the top surface of the scraper ring 4, the outer side surface of the closing block 5 and the inner wall of the hollow cavity, and the pressure cavity and the confining pressure cavity are isolated from each other. At this time, the discharge flow channel 6 is opened by the opening and closing part, and the suction part is opened at the same time to adsorb the particles in the pressure cavity into the discharge flow channel 6, and the medium to be tested that permeates from the upper end of the core module 1 enters the liquid storage container 8 through the outlet on the closing block 5 through the liquid outlet pipe 9, and finally the flow direction of the medium to be tested is controlled by the first valve 10.

[0076] In this embodiment, if Figure 1 , Figure 2 , Figure 3 , Figure 7 , Fig. 9 As shown, a strip opening 11 is provided on one side of the scraper ring 4, and an extension block 12 corresponding to the strip opening 11 is provided on one side of the closing block 5. After the extension block 12 enters the strip opening 11, the extension block 12 closes the strip opening 11. A baffle cap 13 is provided at the upper end surface of the scraper ring 4 of the flow channel. One side of the baffle cap 13 is hinged to the edge of the flow channel, and is used to open the baffle cap 13 through the impact force of the medium in the confining pressure chamber when the scraper ring 4 moves downward. After opening the baffle cap 13, the particle-carrying medium in the confining pressure chamber below the scraper ring 4 can be discharged to the upper area of ​​the scraper ring 4, so as to effectively remove the diffused particles in the confining pressure chamber.

[0077] In this embodiment, if Figure 1 , Figure 2 , Figure 7 As shown, the lifting part includes:

[0078] A mounting seat 14, a fixing plate 15 provided on one side of the mounting seat 14, and a telescopic cylinder 16 provided on the fixing plate 15, the base 3 is used to be placed on the mounting seat 14;

[0079] The strong magnetic ring 17 and the strong magnetic block 18 connected to the output shaft of the telescopic cylinder 16, the telescopic cylinder 16 is used to drive the strong magnetic block 18 to move up and down, the strong magnetic ring 17 is arranged on the scraping ring 4, the strong magnetic block 18 is used to generate attraction between the strong magnetic ring 17, so that the strong magnetic block 18 and the strong magnetic ring 17 have the same motion state, and the scraping ring 4 on the strong magnetic ring 17 is driven by the output shaft of the telescopic cylinder 16 to move to scrape off the fine particles and original fluid discharged from the core module 1, to simulate the actual working conditions of the reservoir, the fine particles and the original fluid are further diffused in the reservoir pore space and throat outside the sample range.

[0080] In this embodiment, if Figure 1 , Figure 2 , Figure 3 , Figure 4 , Fig.10 As shown, the suction part includes:

[0081] A connecting box 19 is arranged at the top of the cylinder 2, and a connecting chamber 20 is arranged in the connecting box 19. The discharge channel 6 connects the connecting chamber 20 with the pressure chamber. A sinking chamber 21 is also arranged on one side of the connecting box 19. The sinking chamber 21 is connected with the connecting chamber 20, and a liquid outlet 22 is arranged at the bottom of the sinking chamber 21.

[0082] A filter plate 23 is disposed in the sinking cavity 21, and the filter plate 23 is located between the liquid outlet 22 and the connecting cavity 20;

[0083] A one-way valve 24 is provided on the liquid outlet 22 and a connecting hose 25 is connected to the liquid outlet 22 at one end. A side inlet 26 connected to the hollow cavity is provided on the side surface of the cylinder 2. The other end of the connecting hose 25 is connected to the side inlet 26.

[0084] A liquid inlet pipe 27 having one end connected to the medium outlet of the displacement system 45, and the other end of the liquid inlet pipe 27 connected to the communication chamber 20, and an opening and closing valve 28 is provided on the liquid inlet pipe 27;

[0085] After opening the on-off valve 28, the displacement system 45 drives the medium to enter the connecting chamber 20 through the liquid inlet pipe 27. The particle-carrying medium discharged from the pressure chamber merges with the medium flowing into the liquid inlet pipe 27. After the particles are filtered by the filter plate 23, the medium enters the hollow cavity of the cylinder 2 laterally through the one-way valve 24 and the connecting hose 25 through the side inlet 26 to form a lateral displacement of the core module 1, simulating the shearing effect experienced by the fluid flow under the actual working conditions of the reservoir. In this way, under the support of the longitudinal and lateral bidirectional flow, the salt water medium fluid diffuses upward evenly inside the core module 1, avoiding local blockage of the pore channels at the bottom of the core module 1, and ensuring the authenticity of the experimental data results.

[0086] In this embodiment, if Figure 2 , Figure 6 As shown, the filter plate 23 is detachably arranged in the sinking cavity 21 , and the upper surface of the filter holes on the filter plate 23 is a concave structure so that the particles are collected on the filter plate 23 .

[0087] In this embodiment, if Figure 2 , Figure 5 As shown, the drainage channel 6 includes a vertical channel and a horizontal channel. One end of the vertical channel is connected to the connecting chamber 20, and one side of the horizontal channel is connected to the pressure chamber. The opening and closing part includes:

[0088] The plug connector 29 is provided with a plug hole 30 on the outer side of the cylinder 2 facing the horizontal channel, and a plug rod 31 is provided at the front end of the plug connector 29. The plug rod 31 is slidably connected with the plug hole 30, and after the plug rod 31 enters the horizontal channel, it is used to seal the horizontal channel;

[0089] A driving assembly for driving the plug-in connector 29 to slide in the plug-in hole 30.

[0090] In this embodiment, if Figure 2 , Figure 5 As shown, the drive assembly includes:

[0091] A tension spring 32 is provided on the insertion rod 31, one end of the tension spring 32 is fixed to the outer side surface of the cylinder 2, and the other end of the tension spring 32 is fixed to the insertion rod 31;

[0092] A lifting rod 33 fixedly connected to the output shaft of the telescopic cylinder 16, one end of the lifting rod 33 is fixedly connected to the strong magnetic block 18;

[0093] A pushing block 34 is arranged on the lifting rod 33, and the connector 29 is provided with a pushing hole 35 that passes through its upper and lower surfaces. One side of the pushing hole 35 is an inclined surface. When the pushing block 34 enters the pushing hole 35, the inclined surface allows the insertion rod 31 to extend out of the insertion hole 30 to open the horizontal channel.

[0094] In this embodiment, if Figure 2 , Fig. 9 As shown, the upper end surface of the scraper ring 4 is inclined, and the lowest point of the upper end surface of the scraper ring 4 is located on the same vertical line as the opening of the horizontal channel in the pressure chamber; to ensure that the particles in the pressure chamber at the lowest point of the upper end surface of the scraper ring 4 are effectively discharged.

[0095] In this embodiment, if Figure 2 , Figure 4 , Figure 8 As shown, the device also includes:

[0096] At least one capture box 36 disposed on the connecting box 19, wherein a capture chamber 37 is disposed in the capture box 36, and a through pipe 38 is disposed at the bottom of the capture chamber 37;

[0097] A second valve 39 provided on the through pipe 38 and a guide pipe 40 connecting the through pipe 38 and the outlet;

[0098] A capture portion disposed in the capture chamber 37, the capture portion being used to capture particles;

[0099] The liquid outlet pipe 9 is connected to the liquid storage container 8 and the capture chamber 37;

[0100] The capture unit includes:

[0101] An arc top filter cover 42 is arranged at the bottom of the capture chamber 37, and a plurality of inclined holes 43 are arranged at the top of the arc top filter cover 42;

[0102] A debris catching velvet ring 44 is arranged on the arc-shaped outer surface of the arc-top filter cover 42, and the inner side surface of the debris catching velvet ring 44 is provided with velvet;

[0103] Under the joint control of the first valve 10 and the second valve 39 on one side, the medium flowing out of the liquid outlet pipe 9 first enters the corresponding capture chamber 37 on this side through the second guide pipe 41 on one side. At this time, the second valve 39 on the other side is in a closed state. For the medium entering the capture chamber 37, the capture part can capture the fine particles and the original fluid in the medium, that is, the medium rushes to the debris catching velvet ring 44 above through the inclined hole 43 on the arc top filter cover 42, and the fine particles and the original fluid in the medium are captured by the fluff provided on the inner side of the debris catching velvet ring 44, and the medium led out through the first guide pipe 40 on this side is measured for permeability, so as to avoid affecting the subsequent data processing and analysis; 3-5 hours later, the first valve 10 and the second valve 39 on the other side jointly control the medium to enter the capture chamber 37 on the corresponding side through the second guide pipe 41 on the other side. The medium flow path arranged in a staggered manner can prevent the fine particles and the original fluid from falling off from the debris catching velvet ring 44 again after long-term use, so as to further ensure the stability of the permeability measurement.

[0104] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0105] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reservoir salt sensitivity experimental device, comprising: A cylinder (2) is provided with a hollow cavity for accommodating the core module (1), wherein the hollow cavity runs through the bottom of the cylinder (2); A base (3) detachably connected to the bottom of the cylinder (2), wherein the base (3) is used to seal the hollow cavity; Characterized in that: the device also includes: A scraper ring (4) having an inner diameter equal to that of the core module (1); after the core module (1) is placed in the hollow cavity, a confining pressure cavity is formed between the core module (1) and the inner wall of the hollow cavity; the scraper ring (4) is sleeved on the outside of the core module (1), and the scraper ring (4) is provided with flow channels penetrating the upper and lower end surfaces thereof; A lifting part for driving the scraper ring (4) to move up and down in the confining pressure chamber; A closing block (5) is arranged on the top wall of the hollow cavity, and after the scraper ring (4) moves to the position where the closing block (5) is located, a pressure chamber is formed between the top surface of the scraper ring (4), the outer side surface of the closing block (5) and the inner wall of the hollow cavity, and the pressure chamber is isolated from the confining pressure chamber; An opening and closing part, wherein a drainage channel (6) is provided on one side of the pressure chamber, and the opening and closing part is used to open and close the drainage channel (6); It is used to generate suction on the pressure chamber after the discharge channel (6) is opened, and to absorb particles in the pressure chamber to the suction part in the discharge channel (6); A displacement system (45) for providing driving force for a saturation displacement process, wherein the displacement system (45) injects a medium into the core module (1) through an injection port (7) provided at the bottom of the base (3); A liquid storage container (8), a liquid outlet pipe (9) and a first valve (10) arranged on the liquid outlet pipe (9), one end of the liquid outlet pipe (9) is connected to the liquid storage container (8), the other end of the liquid outlet pipe (9) is connected to an outlet arranged on the closing block (5), and the outlet is connected to the hollow cavity.

2. A reservoir salt sensitivity experimental equipment according to claim 1, characterized in that: A strip opening (11) is provided on one side of the scraper ring (4), and an extension block (12) corresponding to the strip opening (11) is provided on one side of the closing block (5); after the extension block (12) enters the strip opening (11), the extension block (12) closes the strip opening (11); a stop cap (13) is provided on the upper end surface of the scraper ring (4) of the flow channel, and one side of the stop cap (13) is hinged to the edge of the flow channel, so as to open the stop cap (13) by the impact force of the medium in the confining pressure chamber when the scraper ring (4) moves downward.

3. A reservoir salt-sensitivity experimental device according to claim 1 or 2, characterized in that: The lifting part comprises: A mounting seat (14), a fixing plate (15) arranged on one side of the mounting seat (14), and a telescopic cylinder (16) arranged on the fixing plate (15), wherein the base (3) is used to be placed on the mounting seat (14); A strong magnetic ring (17) and a strong magnetic block (18) connected to the output shaft of the telescopic cylinder (16), the telescopic cylinder (16) is used to drive the strong magnetic block (18) to move up and down, the strong magnetic ring (17) is arranged on the scraping ring (4), and the strong magnetic block (18) is used to generate an attractive force between the strong magnetic ring (17) and the strong magnetic ring (17), so that the movement state of the strong magnetic block (18) and the strong magnetic ring (17) is the same.

4. A reservoir salt sensitivity experimental equipment according to claim 3, characterized in that: The suction part comprises: A connecting box (19) is arranged at the top of the cylinder (2), a connecting chamber (20) is arranged in the connecting box (19), the liquid discharge channel (6) connects the connecting chamber (20) and the pressure chamber, a sinking chamber (21) is further arranged on one side of the connecting box (19), the sinking chamber (21) is connected with the connecting chamber (20), and a liquid outlet (22) is arranged at the bottom of the sinking chamber (21); A filter plate (23) disposed in the sinking cavity (21), wherein the filter plate (23) is located between the liquid outlet end (22) and the communicating cavity (20); a one-way valve (24) provided on the liquid outlet end (22) and a connecting hose (25) having one end in communication with the liquid outlet end (22); a side inlet (26) in communication with the hollow cavity being provided on the side surface of the cylinder (2); and the other end of the connecting hose (25) in communication with the side inlet (26); A liquid inlet pipe (27) is connected to the medium outlet of the displacement system (45) at one end, and the other end of the liquid inlet pipe (27) is connected to the communication chamber (20). An opening and closing valve (28) is provided on the liquid inlet pipe (27).

5. A reservoir salt sensitivity experimental equipment according to claim 4, characterized in that: The filter plate (23) is detachably arranged in the sinking cavity (21), and the upper surface of the filter holes on the filter plate (23) is a concave structure, so that particles are collected on the filter plate (23).

6. A reservoir salt sensitivity experimental equipment according to claim 4 or 5, characterized in that: The drainage channel (6) comprises a vertical channel and a horizontal channel, one end of the vertical channel is connected to the connecting chamber (20), one side of the horizontal channel is connected to the pressure chamber, and the opening and closing part comprises: A plug connector (29), wherein the outer side surface of the cylinder (2) is provided with a plug hole (30) facing the horizontal channel, and the front end of the plug connector (29) is provided with an insertion rod (31), the insertion rod (31) is slidably connected to the plug hole (30), and after the insertion rod (31) enters the horizontal channel, it is used to seal the horizontal channel; A driving assembly for driving a plug-in connector (29) to slide in a plug-in hole (30).

7. A reservoir salt sensitivity experimental equipment according to claim 6, characterized in that: The drive assembly comprises: A tension spring (32) is arranged on the insertion rod (31), one end of the tension spring (32) is fixed to the outer side surface of the cylinder (2), and the other end of the tension spring (32) is fixed to the insertion rod (31); A lifting rod (33) fixedly connected to the output shaft of the telescopic cylinder (16), one end of the lifting rod (33) being fixedly connected to the strong magnetic block (18); A push block (34) is arranged on the lifting rod (33), and the plug-in component (29) is provided with a push hole (35) penetrating the upper and lower surfaces thereof, and one side of the push hole 3 (5) is an inclined surface. When the push block (34) enters the push hole (35), the inclined surface allows the plug rod (31) to extend out of the plug hole (30) to open the horizontal channel.

8. A reservoir salt sensitivity experimental equipment according to claim 7, characterized in that: The upper end surface of the scraper ring (4) is arranged to be inclined, and the lowest point of the upper end surface of the scraper ring (4) and the opening of the horizontal channel in the pressure chamber are located on the same vertical line.

9. A reservoir salt sensitivity experimental equipment according to claim 8, characterized in that: The device also includes: at least one capture box (36) disposed on the connecting box (19), wherein a capture chamber (37) is disposed in the capture box (36), and a through pipe (38) is disposed at the bottom of the capture chamber (37); a second valve (39) disposed on the through pipe (38) and a guide pipe (40) connecting the through pipe (38) and the outlet; A capturing portion disposed in the capturing chamber (37), the capturing portion being used to capture particles; The liquid outlet pipe (9) is in communication with the liquid storage container (8) and the capture chamber (37).

10. A reservoir salt-sensitivity experimental device according to claim 8, characterized in that: The capture unit comprises: An arc-top filter cover (42) is arranged at the bottom of the capture chamber (37), and a plurality of inclined holes (43) are arranged at the top of the arc-top filter cover (42); A debris catching velvet ring (44) is arranged on the arc-shaped outer surface of the arc-top filter cover (42), and the inner side surface of the debris catching velvet ring (44) is provided with velvet.

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