A reservoir salt sensitivity experiment device

Abstract

The present application relates to the technical field of sensitivity test of reservoir, in particular to a kind of reservoir salt sensitivity experiment equipment, including hollow cavity for placing core module inside the barrel, the hollow cavity penetrates the bottom of the barrel;Small particles and original fluid discharged in core module are removed by the movement of the scrap circle on the strong magnetic circle driven by the output shaft of telescopic cylinder, to simulate the further diffusion of small particles and original fluid in reservoir pore space and throat outside the sample range under actual working conditions of reservoir, and without using epoxy resin to seal experimental sample, avoid the occurrence of the situation that experimental equipment does not have the ability to simulate actual working conditions of reservoir and cross contamination in traditional salt sensitivity experiment process, can guarantee the authenticity of experimental results, finally small particles, original fluid discharged on the upper end and side end of core module are captured by medium flow path arranged in staggered mode respectively by scrap catching velvet ring, avoid affecting permeability stability measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensitivity test of clastic rock reservoirs, and particularly to a reservoir salt sensitivity experiment device. BACKGROUND

[0002] When clastic rock oil and gas reservoirs are contacted by external fluids, their permeability often changes significantly when they are contacted by salt water of different salinity levels. Salt sensitivity experiments are used to test the degree of permeability change, analyze the degree of reservoir damage caused by salt sensitivity changes, and find out the conditions for salt sensitivity to occur, thereby providing a basis for the rational design of various oil and gas-related working fluids.

[0003] There are various types of devices for testing reservoir salt sensitivity. The latest Chinese patent application (application number CN202311206436.1) discloses an experimental device and method for evaluating the sensitivity of terrestrial shale, which includes an axial pressure system, a displacement system, and a holder. This invention solves the problem of low porosity and low permeability of shale reservoirs, and can avoid the closure of internal bedding joints in shale due to external forces, ensuring integrity. During actual reservoir salt sensitivity evaluation tests, the working fluid filtrate with a salinity lower than that of the formation water is displaced into the reservoir, which generally causes the swelling and dispersion of clay. The swelling and dispersion of clay further diffuse small particles and original fluids in the reservoir pore space and throat. However, the experimental sample in the above experimental device is sealed with epoxy resin, which prevents the diffusion of small particles and original fluids in the reservoir pore space and throat. Moreover, the epoxy resin that penetrates into the pores can damage the experimental sample, resulting in a deviation of the simulation results from the actual reservoir conditions and a serious deviation of the experimental data. SUMMARY

[0004] Therefore, the present application aims to provide a reservoir salt sensitivity experiment device to solve the technical problems of the prior art that cannot guarantee the authenticity of experimental data and may cause cross-contamination of experimental samples.

[0005] To achieve the above purpose, the present application provides a reservoir salt sensitivity experiment device, which comprises:

[0006] The barrel is internally provided with a hollow cavity for placing a core module, and the hollow cavity penetrates the bottom of the barrel;

[0007] The base is detachably connected to the bottom of the barrel, and the base is used to seal the hollow cavity;

[0008] The device further comprises:

[0009] A scrap circle with an inner diameter equal to the diameter of the core module, after the core module is placed in the hollow cavity, the core module and the inner wall of the hollow cavity form a confining pressure cavity, the scrap circle is sleeved on the outside of the core module, and the scrap circle is provided with a flow channel penetrating the upper and lower end faces thereof;

[0010] A lifting part for driving the scrap circle to move up and down in the confining pressure cavity;

[0011] A closing block arranged on the top wall of the hollow cavity, after the scrap circle moves to the position where the closing block is located, a pressure cavity is formed between the top end face of the scrap circle, the outer side face of the closing block and the inner wall of the hollow cavity, and the pressure cavity and the confining pressure cavity are isolated from each other;

[0012] An opening and closing part, one side of the pressure cavity is provided with a liquid discharge flow channel, and the opening and closing part is used for opening and closing the liquid discharge flow channel;

[0013] A suction part for generating suction on the pressure cavity after the liquid discharge flow channel is opened, and for adsorbing particles in the pressure cavity into the liquid discharge flow channel;

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

[0015] A liquid storage container, a liquid outlet pipeline and a first valve arranged on the liquid outlet pipeline, one end of the liquid outlet pipeline is in communication with the liquid storage container, the other end of the liquid outlet pipeline is in communication with an outlet arranged on the closing block, and the outlet is in communication with the hollow cavity.

[0016] Further, one side of the scrap circle is provided with a strip-shaped opening, one side of the closing block is provided with an extension block corresponding to the strip-shaped opening, after the extension block enters the strip-shaped opening, the extension block closes the strip-shaped opening, a baffle cap is arranged at the position of the upper end face of the scrap circle, one side of the baffle cap is hinged to the edge of the flow channel, and the baffle cap is opened by the impact force of the medium in the confining pressure cavity when the scrap circle moves downward.

[0017] Further, the lifting part comprises:

[0018] A mounting seat, a fixed plate arranged on one side of the mounting seat and a telescopic cylinder arranged on the fixed plate, and the base is used for being placed on the mounting seat;

[0019] A strong magnetic ring and a strong magnetic block connected with the output shaft of the telescopic cylinder, the telescopic cylinder is used for driving the strong magnetic block to move up and down, the strong magnetic ring is arranged on the scrap circle, and the strong magnetic block is used for generating an attractive force with the strong magnetic ring, so that the motion state of the strong magnetic block is the same as that of the strong magnetic ring.

[0020] Further, the suction part comprises:

[0021] A communication box is arranged on the top of the cylinder, and a communication cavity is arranged in the communication box.

[0022] A filter plate is arranged in the sinking cavity, and the filter plate is located between the liquid outlet and the communication cavity.

[0023] A one-way valve is arranged on the liquid outlet, and a communication hose is arranged in communication with the liquid outlet, and a side inlet is arranged on the side surface of the cylinder and in communication with the hollow cavity.

[0024] A liquid inlet pipeline is arranged in communication with the medium outlet of the displacement system, and the other end of the liquid inlet pipeline is in communication with the communication cavity, and an on-off valve is arranged on the liquid inlet pipeline.

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

[0026] Further, the liquid outlet flow channel includes a vertical channel and a horizontal channel, one end of the vertical channel is in communication with the communication cavity, one side of the horizontal channel is in communication with the pressure cavity, and the on-off part includes:

[0027] The plug-in part, the outer side surface of the cylinder is provided with a plug hole opposite to the horizontal channel, the front end of the plug-in part is provided with a plug rod, the plug rod is in sliding connection with the plug hole, and after the plug rod enters the horizontal channel, the plug rod is used for sealing the horizontal channel;

[0028] The driving assembly is used for driving the plug-in part to slide in the plug hole.

[0029] Further, the driving assembly includes:

[0030] A tension spring is arranged on the plug rod, one end of the tension spring is fixed to the outer side surface of the cylinder, and the other end of the tension spring is fixed to the plug rod.

[0031] The lifting rod is fixedly connected with the output shaft of the telescopic cylinder, and one end of the lifting rod is fixedly connected with the strong magnetic block.

[0032] A push block is arranged on the lifting rod, the plug-in part is provided with a push hole penetrating through the upper and lower surfaces of the plug-in part, one side of the push hole is an inclined surface, and in the process that the push block enters the push hole, the plug rod is extended out of the plug hole to open the horizontal channel through the inclined surface.

[0033] Further, the upper end surface of the scrap removal ring is inclined, and the lowest point of the upper end surface of the scrap removal ring is located on the same vertical line as the opening of the horizontal channel in the pressure cavity.

[0034] Further, the device further comprises:

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

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

[0037] A capture part arranged in the capture cavity, wherein the capture part is used for capturing particles;

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

[0039] Further, the capture part comprises:

[0040] An arc top filter cover arranged at the bottom of the capture cavity, wherein a plurality of inclined holes are arranged at the top of the arc top filter cover;

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

[0042] The beneficial effects of the present application are as follows: by using the reservoir salt sensitivity experiment device, the output shaft of the telescopic cylinder drives the debris scraping ring on the strong magnetic ring to move, so as to scrape off the fine particles and original fluid discharged from the core module, to simulate the further diffusion of the fine particles and original fluid outside the sample range in the reservoir pore space and throat under the actual working condition of the reservoir, and the experiment sample does not need to be sealed by using epoxy resin, so as to avoid the situation that the traditional salt sensitivity experiment process does not have the ability to simulate the actual working condition of the reservoir and cross contamination occurs, and the authenticity of the experimental results can be ensured, and finally the fine particles and original fluid discharged from the upper end and side end of the core module are captured by the medium flow paths arranged in a staggered manner, so as to avoid affecting the permeability stability measurement. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only illustrate the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

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

[0045] Figure 2 It is a structural schematic diagram of the present application;

[0046] Figure 3 It is a top view of the closing block in the present application;

[0047] Figure 4 is the internal schematic view of the capturing box in the present application;

[0048] Figure 5 is the internal schematic view of the capturing box in the present application; Figure 2 is the structure enlarged view at A in the present application;

[0049] Figure 6 is the internal schematic view of the capturing box in the present application; Figure 2 is the structure enlarged view at B in the present application;

[0050] Figure 7 is the connection schematic view of the telescopic cylinder and the strong magnetic block in the present application;

[0051] Figure 8 is the assembly schematic view of the arc top filter cover and the scrap capturing velvet ring in the present application;

[0052] Figure 9 is the assembly schematic view of the scrap scraping ring and the strong magnetic ring in the present application;

[0053] Figure 10 is the medium fluid flow direction schematic view in the present application.

[0054] in the figure is marked as:

[0055] 1, core module; 2, barrel; 3, base; 4, scrap scraping ring; 5, closing block; 6, liquid discharge flow channel; 7, injection port; 8, liquid storage container; 9, liquid outlet pipeline; 10, first valve; 11, strip-shaped opening; 12, extension block; 13, blocking cap; 14, mounting seat; 15, fixed plate; 16, telescopic cylinder; 17, strong magnetic ring; 18, strong magnetic block; 19, communication box; 20, communication cavity; 21, sinking cavity; 22, liquid outlet end; 23, filter plate; 24, one-way valve; 25, communication hose; 26, side inlet; 27, liquid inlet pipeline; 28, on-off valve; 29, plug-in part; 30, plug hole; 31, plug rod; 32, tension spring; 33, lifting rod; 34, pushing block; 35, pushing hole; 36, capturing box; 37, capturing cavity; 38, through pipe; 39, second valve; 40, guide pipe; 42, arc top filter cover; 43, inclined hole; 44, scrap capturing velvet ring; 45, displacement system. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application is further described in detail below in combination with specific embodiments.

[0057] It should be noted that the technical terms or scientific terms used in the present application shall be the general meanings understood by those skilled in the art unless otherwise defined. The terms "first", "second" and the like used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0058] The embodiments of the present application provide a reservoir salt sensitivity experiment device, as shown in Figure 1 、 Figure 2 The device comprises a barrel 2 internally provided with a hollow cavity for placing a core module 1, and the hollow cavity penetrates through the bottom of the barrel 2.

[0059] A base 3 detachably connected to the bottom of the barrel 2, the base 3 being used to seal the hollow cavity.

[0060] The device further comprises:

[0061] A scrap circle 4 with an inner diameter equal to the diameter 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 scrap circle 4 is sleeved on the outside of the core module 1, and the scrap circle 4 is provided with a flow channel penetrating through the upper and lower end faces thereof.

[0062] A lifting part for driving the scrap circle 4 to make lifting movement in the confining pressure cavity.

[0063] A closing block 5 provided on the top wall of the hollow cavity, after the scrap circle 4 moves to the position where the closing block 5 is located, a pressure cavity is formed between the top end face of the scrap circle 4, the outer side face 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.

[0064] An opening and closing part, one side of the pressure cavity is provided with a liquid discharge flow channel 6, and the opening and closing part is used to open and close the liquid discharge flow channel 6.

[0065] A suction part for generating suction on the pressure cavity after the liquid discharge flow channel 6 is opened, and for adsorbing particles in the pressure cavity into the liquid discharge flow channel 6.

[0066] A displacement system 45 for providing driving force for a saturation displacement process, 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] The liquid storage container 8, the liquid outlet pipeline 9 and the first valve 10 arranged on the liquid outlet pipeline 9, one end of the liquid outlet pipeline 9 is communicated with the liquid storage container 8, and the other end of the liquid outlet pipeline 9 is communicated with the outlet arranged on the sealing block 5, and the outlet is communicated with the hollow cavity.

[0068] The method using the above-mentioned reservoir salt sensitivity experiment equipment comprises the following steps:

[0069] S1, sample preparation: representative reservoir rock samples are selected, and it is ensured that the selected core module 1 can represent the actual reservoir, so as to avoid experimental result distortion caused by sample selection deviation, the core module 1 is thoroughly cleaned to remove surface impurities and attached residual fluid, and the core columnar sample of appropriate size is dried and cut, and the basic parameters such as initial permeability, porosity and mineral composition of the sample are tested;

[0070] S2, brine preparation: according to the experimental requirements, different salinity brine solutions are configured, and the salinity range that may be encountered in the actual reservoir is covered, and the brine medium fluid of different salinity is ensured to be completely dissolved without undissolved particles, and is fully stirred uniformly under constant temperature conditions before injection, so as to avoid salt precipitation caused by local high concentration;

[0071] S3, saturation displacement: the core module 1 sample is placed in the cylinder 2, and the salt sensitivity test of the core module 1 sample is carried out by reducing the salinity, the first stage brine is still formation water, the salinity is gradually reduced by a certain concentration difference, and the salinity of the injected liquid is close to zero, and the salinity under each concentration difference level is maintained for 6-10h, so as to ensure that the brine and the reservoir minerals in the core module 1 fully act;

[0072] S4, permeability measurement: the permeability of the core module 1 on both sides is measured respectively under constant pressure, and the permeability data is recorded to verify the reliability of the experimental results;

[0073] S5, data processing and analysis: the relative change rate of the permeability under each concentration difference level is calculated, the salt sensitivity index is calculated, the curve of the permeability changing with the salinity is drawn, the salt sensitivity trend and the critical salinity are analyzed, and the sensitivity of the core module 1 to the brine is quantitatively evaluated.

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

[0075] The core module 1 sample is placed in the hollow cavity, positioned by the scraping ring 4, and then the barrel 2 and the base 3 are assembled to complete the sealing assembly of the core module 1. Then, saturation displacement is performed, that is, the medium is injected into the core module 1 through the injection port 7 by the displacement system 45, the sample of the core module 1 is formed in the confining pressure cavity, and then the scraping ring 4 is driven to move up and down in the confining pressure cavity by the lifting part. After the scraping ring 4 moves to the position of the sealing block 5, a pressure cavity is formed between the top end surface of the scraping ring 4, the outer surface of the sealing 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 liquid discharge channel 6 is opened by the opening and closing part, and the suction part is also opened at the same time to adsorb the particles in the pressure cavity into the liquid discharge channel 6. The measured medium permeated out of the upper end of the core module 1 enters the liquid storage container 8 through the outlet on the sealing block 5 and the liquid outlet pipeline 9, and finally the flow of the measured medium is controlled by the first valve 10.

[0076] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 9 , one side of the scraping ring 4 is provided with a strip-shaped opening 11, and one side of the sealing block 5 is provided with an extension block 12 corresponding to the strip-shaped opening 11. After the extension block 12 enters the strip-shaped opening 11, the extension block 12 closes the strip-shaped opening 11. The flow channel is provided with a stopper 13 at the position of the upper end surface of the scraping ring 4. One side of the stopper 13 is hinged to the edge of the flow channel. When the scraping ring 4 moves downward, the stopper 13 is opened by the impact force of the medium in the confining pressure cavity. After the stopper 13 is opened, the medium with particles below the scraping ring 4 in the confining pressure cavity can be discharged to the upper region of the scraping ring 4, so as to effectively remove the diffused particles in the confining pressure cavity.

[0077] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 7 , the lifting part comprises:

[0078] a mounting seat 14, a fixed plate 15 arranged on one side of the mounting seat 14, and a telescopic cylinder 16 arranged on the fixed plate 15. The base 3 is used to be placed on the mounting seat 14;

[0079] a strong magnetic ring 17 and a strong magnetic block 18 connected with 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 an attractive force with the strong magnetic ring 17, so that the motion state of the strong magnetic block 18 is the same as that of the strong magnetic ring 17. The scraping ring 4 on the strong magnetic ring 17 is moved by the output shaft of the telescopic cylinder 16, so as to scrape off the fine particles and original fluid discharged from the core module 1, so as to simulate the further diffusion of the fine particles and the original fluid outside the sample range in the pore space and throat of the reservoir under the actual working condition of the reservoir.

[0080] In the embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 10 The suction part comprises:

[0081] A communication box 19 is arranged at the top of the barrel 2, the communication box 19 is provided with a communication cavity 20, the liquid discharge channel 6 is communicated with the pressure cavity through the communication cavity 20, and one side of the communication box 19 is further provided with a sinking cavity 21, the sinking cavity 21 is communicated with the communication cavity 20, and the bottom of the sinking cavity 21 is provided with a liquid outlet end 22;

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

[0083] A one-way valve 24 is arranged on the liquid outlet end 22, and a communication hose 25 communicated with the liquid outlet end 22 at one end, the side surface of the barrel 2 is provided with a side inlet 26 communicated with the hollow cavity, and the other end of the communication hose 25 is communicated with the side inlet 26;

[0084] A liquid inlet pipeline 27 communicated with the medium outlet of the displacement system 45 at one end, the other end of the liquid inlet pipeline 27 is communicated with the communication cavity 20, and the liquid inlet pipeline 27 is provided with an on-off valve 28;

[0085] After the on-off valve 28 is opened, the displacement system 45 drives the medium to enter the communication cavity 20 through the liquid inlet pipeline 27, the medium with particles discharged by the pressure cavity is converged with the medium flowing into the liquid inlet pipeline 27, after the particles are filtered through the filter plate 23, the medium enters the hollow cavity of the barrel 2 through the side inlet 26 and the communication hose 25 and the one-way valve 24, to form a lateral displacement to the core module 1, simulate the shear effect experienced by the fluid flow under the actual working condition of the reservoir, so that the brine medium fluid uniformly diffuses upward in the inside of the core module 1 under the double-directional flow of the longitudinal and lateral directions, avoids the local blockage of the lower pore channel of the core module 1, and ensures the authenticity of the experimental data results.

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

[0087] In the embodiment, as shown in Figure 2 , Figure 5 The liquid discharge channel 6 comprises a vertical channel and a horizontal channel, one end of the vertical channel is communicated with the communication cavity 20, one side of the horizontal channel is communicated with the pressure cavity, and the on-off part comprises:

[0088] The outer side of the barrel 2 is provided with a socket 30 corresponding to the horizontal channel, and the front end of the plug 29 is provided with a plug rod 31 which is in sliding connection with the socket 30 and is used to seal the horizontal channel after the plug rod 31 enters the horizontal channel.

[0089] A driving assembly is used to drive the plug 29 to slide in the socket 30.

[0090] In the embodiment, as shown in Figure 2 、 Figure 5 , the driving assembly comprises:

[0091] A tension spring 32 is arranged on the plug rod 31, one end of the tension spring 32 is fixed to the outer side of the barrel 2, and the other end of the tension spring 32 is fixed to the plug rod 31;

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

[0093] A pushing block 34 is arranged on the lifting rod 33, and the plug 29 is provided with a pushing hole 35 which penetrates through the upper and lower surfaces of the plug 29, one side of the pushing hole 35 is an inclined surface, and in the process of the pushing block 34 entering the pushing hole 35, the plug rod 31 is extended out of the socket 30 through the inclined surface to open the horizontal channel.

[0094] In the embodiment, as shown in Figure 2 、 Figure 9 , the upper end surface of the scrap removing ring 4 is arranged to be inclined, and the lowest point of the upper end surface of the scrap removing ring 4 is located on the same vertical line as the opening of the horizontal channel in the pressure cavity; so as to ensure that the particles in the pressure cavity at the lowest point of the upper end surface of the scrap removing ring 4 are effectively discharged.

[0095] In the embodiment, as shown in Figure 2 、 Figure 4 、 Figure 8 , the device further comprises:

[0096] At least one capture box 36 is arranged on the communication box 19, the capture box 36 is provided with a capture cavity 37, and the bottom of the capture cavity 37 is provided with a through pipe 38;

[0097] A second valve 39 is arranged on the through pipe 38, and a guide pipe 40 is arranged to communicate the through pipe 38 and the outlet;

[0098] A capture part is arranged in the capture cavity 37, and the capture part is used to capture particles;

[0099] The liquid outlet pipeline 9 communicates the liquid storage container 8 and the capture cavity 37;

[0100] The capture part comprises:

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

[0102] A debris capturing velvet ring 44 is arranged on the arc-shaped outer surface of the arc top filter cover 42, and the inner side of the debris capturing 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 pipeline 9 first enters the corresponding capture cavity 37 on the side through the second guide pipe 41 on the side, and at this time, the second valve 39 on the other side is in a closed state. For the medium entering the capture cavity 37, the capturing part can capture the fine particles and original fluid in the medium, that is, the medium is flushed upwards through the inclined holes 43 on the arc top filter cover 42 to the debris capturing velvet ring 44 above, the fine particles and original fluid in the medium are captured by the velvet on the inner side of the debris capturing velvet ring 44, and the medium introduced through the first guide pipe 40 on the side is subjected to permeability measurement, so as to avoid affecting the subsequent data processing and analysis. After 3-5h, the medium enters the corresponding capture cavity 37 on the other side through the second guide pipe 41 on the other side under the joint control of the first valve 10 and the second valve 39 on the other side. The staggered arrangement of the medium flow path can avoid the fine particles and original fluid from falling off the debris capturing velvet ring 44 again after a long time of use, and further ensure the stability of the permeability measurement.

[0104] Those skilled in the art will understand that the above discussion of any embodiment is only exemplary and is not intended to limit the scope of the present application (including claims) to these examples; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the present application as described above. In order to be brief, they are not provided in details.

[0105] The present application is intended to cover all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Accordingly, any and all such modifications, variations, omissions, and equivalents are intended to be encompassed by the present application.

Claims

1. A reservoir salt sensitivity experiment device, comprising: a barrel (2) with a hollow cavity for placing a core module (1), the hollow cavity penetrating through the bottom of the barrel (2); a base (3) detachably connected with the bottom of the barrel (2), the base (3) being used for sealing the hollow cavity; characterized in that the device further comprises: a scrap circle (4) with an inner diameter equal to the diameter 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 scrap circle (4) is sleeved on the outside of the core module (1), and the scrap circle (4) is provided with a flow channel penetrating through the upper and lower end faces thereof; a lifting part for driving the scrap circle (4) to make lifting movement in the confining pressure cavity; a closing block (5) arranged on the top wall of the hollow cavity, after the scrap circle (4) moves to the position where the closing block (5) is located, a pressure cavity is formed between the top end face of the scrap circle (4), the outer side face 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; an opening and closing part, one side of the pressure cavity is provided with a liquid discharge flow channel (6), the opening and closing part is used for opening and closing the liquid discharge flow channel (6); a suction part for generating suction on the pressure cavity after the liquid discharge flow channel (6) is opened, and for adsorbing particles in the pressure cavity into the liquid discharge flow channel (6); a displacement system (45) for providing driving force for a saturation displacement process, the displacement system (45) is used for injecting medium into the core module (1) through an injection inlet (7) arranged on the bottom of the base (3); a liquid storage container (8), a liquid outlet pipeline (9) and a first valve (10) arranged on the liquid outlet pipeline (9), one end of the liquid outlet pipeline (9) communicates with the liquid storage container (8), the other end of the liquid outlet pipeline (9) communicates with an outlet arranged on the closing block (5), and the outlet communicates with the hollow cavity.

2. The reservoir salt sensitivity experiment apparatus of claim 1, wherein, one side of the scrap circle (4) is provided with a strip-shaped opening (11), one side of the closing block (5) is provided with an extension block (12) corresponding to the strip-shaped opening (11), after the extension block (12) enters into the strip-shaped opening (11), the extension block (12) closes the strip-shaped opening (11), a baffle (13) is arranged at the position of the upper end face of the scrap circle (4), one side of the baffle (13) is hinged with the edge of the flow channel, and the baffle (13) is opened by the impact force of the medium in the confining pressure cavity when the scrap circle (4) moves downward.

3. The reservoir salt sensitivity experiment device according to claim 1 or 2, characterized in that, the lifting part comprises: a mounting seat (14), a fixed plate (15) arranged on one side of the mounting seat (14) and a telescopic cylinder (16) arranged on the fixed plate (15), and the base (3) is used for being placed on the mounting seat (14); a strong magnetic ring (17) and a strong magnetic block (18) connected with the output shaft of the telescopic cylinder (16), the telescopic cylinder (16) is used for driving the strong magnetic block (18) to make lifting movement, the strong magnetic ring (17) is arranged on the scrap circle (4), and the strong magnetic block (18) is used for generating attraction with the strong magnetic ring (17) to make the motion state of the strong magnetic block (18) same as that of the strong magnetic ring (17).

4. The reservoir salt sensitivity experiment apparatus of claim 3, wherein, the suction part comprises: A communication box (19) is arranged on the top of the cylinder (2), and a communication cavity (20) is arranged in the communication box (19); the liquid discharge channel (6) is communicated with the communication cavity (20) and the pressure cavity; a sinking cavity (21) is further arranged on one side of the communication box (19), and the sinking cavity (21) is communicated with the communication cavity (20), and a liquid outlet (22) is arranged at the bottom of the sinking cavity (21); A filter plate (23) is arranged in the sinking cavity (21), and the filter plate (23) is located between the liquid outlet (22) and the communication cavity (20); A one-way valve (24) is arranged on the liquid outlet (22), and a communication hose (25) is communicated with the liquid outlet (22); a side inlet (26) is arranged on the side surface of the cylinder (2) and communicated with the hollow cavity; and the other end of the communication hose (25) is communicated with the side inlet (26); A liquid inlet pipeline (27) is communicated with the medium outlet of the displacement system (45) at one end, and the other end of the liquid inlet pipeline (27) is communicated with the communication cavity (20); and an on-off valve (28) is arranged on the liquid inlet pipeline (27).

5. The reservoir salt sensitivity experiment apparatus of claim 4, wherein, The filter plate (23) is detachably arranged in the sinking cavity (21), and the upper surface of the filter hole of the filter plate (23) is in a concave structure, so that the particles are collected on the filter plate (23).

6. A reservoir salt sensitivity experiment apparatus according to claim 4 or 5, wherein, The liquid discharge channel (6) comprises a vertical channel and a horizontal channel; one end of the vertical channel is communicated with the communication cavity (20); one side of the horizontal channel is communicated with the pressure cavity; and the on-off part comprises: An insertion part (29) is arranged on the side surface of the cylinder (2) and matched with the horizontal channel; the front end of the insertion part (29) is provided with an insertion rod (31); the insertion rod (31) is slidably connected with the insertion hole (30); and after the insertion rod (31) is inserted into the horizontal channel, the insertion rod (31) is used for sealing the horizontal channel; A driving assembly is arranged for driving the insertion part (29) to slide in the insertion hole (30).

7. The reservoir salt sensitivity experiment apparatus of claim 6, wherein, The driving assembly comprises: A tension spring (32) is arranged on the insertion rod (31); one end of the tension spring (32) is fixed to the 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) is fixedly connected with the output shaft of the telescopic cylinder (16); one end of the lifting rod (33) is fixedly connected with the strong magnetic block (18); A pushing block (34) is arranged on the lifting rod (33); the insertion part (29) is provided with a pushing hole (35) penetrating through the upper and lower surfaces of the insertion part (29); one side of the pushing hole (35) is an inclined surface; and during the process that the pushing block (34) is inserted into the pushing hole (35), the insertion rod (31) is extended out of the insertion hole (30) through the inclined surface, so as to open the horizontal channel.

8. The reservoir salt sensitivity experiment apparatus of claim 7, wherein, The upper end surface of the chip removal ring (4) is arranged in an inclined manner, and the lowest point of the upper end surface of the chip removal ring (4) is located on the same vertical line as the opening of the horizontal channel in the pressure cavity.

9. The reservoir salt sensitivity experiment apparatus of claim 8, wherein, The device further comprises: At least one capture box (36) is arranged on the communication box (19); a capture cavity (37) is arranged in the capture box (36); and a through pipe (38) is arranged at the bottom of the capture cavity (37). A second valve (39) is arranged on the through pipe (38), and a guide pipe (40) is arranged to communicate the through pipe (38) with an outlet; A capturing part is arranged in the capturing cavity (37), and the capturing part is used for capturing particles; The liquid outlet pipe (9) communicates the liquid storage container (8) with the capturing cavity (37).

10. The reservoir salt sensitivity experiment apparatus of claim 9, wherein, The capturing part comprises: An arc top filter cover (42) is arranged at the bottom of the capturing cavity (37), and a plurality of inclined holes (43) are arranged at the top of the arc top filter cover (42); A capturing lint ring (44) is arranged on the arc-shaped outer surface of the arc top filter cover (42), and the inner side of the capturing lint ring (44) is provided with lint.

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