Core vacuumizing and pressurizing saturator and bore diameter optimization method of inner container of saturator

Abstract

The invention discloses a core evacuating and pressurizing saturator and a bore diameter optimization method of an inner container of the core evacuating and pressurizing saturator, the core evacuating and pressurizing saturator comprises a hollow core chamber and the inner container arranged in the core chamber, the body of the inner container is cylindrical and is provided with a plurality of open pores for fluid circulation, and the open pores are communicated with the core chamber. The body comprises a first half cylinder and a second half cylinder which are oppositely arranged along the symmetrical face, the first half cylinder is provided with a first butt joint face facing the second half cylinder, the first butt joint face is provided with a first locking part, the second half cylinder is provided with a second butt joint face facing the first half cylinder, the second butt joint face is provided with a second locking part, and the inner container is in a closed state. When the inner container is in a closed state, the first locking part and the second locking part are in contact and meshed to form an embedded structure in a matched mode. While rock core saturation is ensured, effective protection of the rock core and efficient separation of liquid are considered, the test precision and the operation convenience are improved, and in addition, it can be ensured that the liquid flow rate and the rock core protection effect reach the optimal balance.

Description

Technical Field

[0001] The present invention relates to the technical field of core testing equipment, and particularly relates to a core evacuation, pressurization and saturation device and a method for optimizing the aperture of its inner liner. Background Art

[0002] A rock sample (referred to as "rock sample" or "core" for short) is a sample taken from formation rock. At present, usually in a laboratory, physical and mechanical parameters of the rock sample are obtained by testing the rock sample, so as to scientifically and reliably support the drilling and completion engineering design.

[0003] Currently, the core evacuation, pressurization and saturation device used for core physical property testing mainly adopts a single cavity structure. The core to be tested is directly placed in the core chamber, and the core is fully saturated by evacuating, pressurizing and injecting liquid, and then parameters such as porosity are measured. However, the inventor has found that there are many defects in the structure of the existing core evacuation, pressurization and saturation device:

[0004] (1) Insufficient protection for the core: When cores such as shale with high brittleness are directly placed into the core chamber, due to the impact and friction generated during loading, pressurization, pouring and other processes, the core is likely to be broken or damaged, thus affecting the accuracy and repeatability of the test results.

[0005] (2) It will cause liquid waste and splashing problems: During the process of liquid injection and discharge, since the core is in direct contact with the liquid, the liquid often splashes during operation, which not only wastes the test liquid, but also may cause the liquid to seep into other components of the device, interfering with the experimental environment.

[0006] (3) Inconvenient operation and difficult to take and place the core: Since the core and the liquid are in the same closed space in the core evacuation, pressurization and saturation device, there is often a large amount of liquid residue when the core is taken out, increasing the operation complexity and the risk of subsequent data interference.

[0007] Therefore, it is urgent to improve the existing core evacuation, pressurization and saturation device to solve at least one of the above problems. Summary of the Invention

[0008] Aiming at the defects of the prior art, an embodiment of the present invention provides a core evacuation, pressurization and saturation device and a method for optimizing the aperture of its inner liner. The inner liner has better anti-slip property and sealing property, can effectively protect the core, and at the same time can realize efficient liquid separation, improve the test accuracy and operation convenience, and in addition, can ensure that the liquid flow rate and the core protection effect reach the best balance.

[0009] The specific technical solution of the embodiment of the present invention is as follows:

[0010] A core evacuation, pressurization and saturation device, the core evacuation, pressurization and saturation device includes a hollow core chamber and an inner liner disposed in the core chamber. The inner liner includes: a cylindrical body, and a plurality of openings for fluid circulation are formed on the body; the body has a symmetry plane along the longitudinal direction, and the body includes: a first half cylinder and a second half cylinder oppositely disposed along the symmetry plane. The first half cylinder has a first docking surface facing the second half cylinder, and a first locking portion is disposed on the first docking surface. The second half cylinder has a second docking surface facing the first half cylinder, and a second locking portion is disposed on the second docking surface. The inner liner has a separated state and a closed state. When the inner liner is in the closed state, the first locking portion and the second locking portion are in contact and engaged to form a fitting structure in cooperation.

[0011] In a preferred embodiment, the first locking portion includes a plurality of first sawteeth formed on the first docking surface along the longitudinal direction of the body. The first sawteeth include: a first convex portion and a first concave portion spaced a first distance apart along the longitudinal direction;

[0012] The second locking portion includes a plurality of second sawteeth formed on the second docking surface along the longitudinal direction of the body. The second sawteeth include: a second convex portion and a second concave portion spaced the first distance apart along the longitudinal direction;

[0013] When the inner liner is in the closed state, the first convex portion is in contact and engaged with the second concave portion, and the second convex portion is in contact and engaged with the first concave portion.

[0014] In a preferred embodiment, the sawtooth sizes of the first sawteeth and the second sawteeth are the same. The sawtooth width of the first sawteeth or the second sawteeth is 2.5 ± 0.5 mm; the sawtooth height is 1.5 ± 0.5 mm, and the tooth gap is 5 mm.

[0015] In a preferred embodiment, the body includes a bottom wall and a side wall surrounding the bottom wall, and a plurality of the openings are uniformly distributed on the bottom wall and the side wall.

[0016] In a preferred embodiment, the openings are circular holes, and the diameter of the openings is 3 mm to 5 mm.

[0017] In a preferred embodiment, the center-to-center distance between adjacent two of the openings is 6 mm, and a plurality of the openings are distributed in a regular grid pattern.

[0018] In a preferred embodiment, the inner liner is made of polyetheretherketone.

[0019] In a preferred embodiment, a buffer layer is disposed on the inner wall of the inner liner.

[0020] In a preferred embodiment, the buffer layer is a silicone buffer layer with a thickness of 0.5 mm.

[0021] In a preferred embodiment, a sealing layer is provided between the outer wall of the inner container and the inner wall of the core chamber.

[0022] In a preferred embodiment, the sealing layer is a polyurethane sealing layer with a thickness of 5 mm.

[0023] A core evacuation pressurization saturator, the core evacuation pressurization saturator includes the inner container of any one of the above-mentioned core evacuation pressurization saturators, a core chamber for accommodating the inner container, the upper end of the core chamber is an open end, and an upper cover is detachably provided on the open end, and a pressure indicator is provided on the upper cover.

[0024] A pore size optimization method based on the inner container of any one of the above-mentioned core evacuation pressurization saturators, the pore size optimization method of the inner container includes:

[0025] Determine the single-hole effective flow area based on the designed pore size of the opening of the inner container, and determine the average number of pores per unit area based on the designed center-to-center distance between the holes of the opening;

[0026] Determine the effective flow area per unit area based on the single-hole effective flow area and the average number of pores per unit area;

[0027] Based on the designed pore size, the effective flow area per unit area and the known target opening ratio, and the first correspondence between the optimized pore size and the designed pore size, the effective flow area per unit area and the known target opening ratio, determine the optimized pore size, and the first correspondence is:

[0028] d optimal = d0×(P target / P ref ) 1 / 2

[0029] In the above formula: d optimal represents the optimized pore size;

[0030] d0 represents the designed pore size;

[0031] P target represents the target opening ratio required by the experiment;

[0032] P ref represents the determined effective flow area per unit area.

[0033] The technical solution of the present invention has the following remarkable beneficial effects:

[0034] 1. It can effectively protect the core: The left and right halves of the inner liner are spliced together and form a fitting structure at the splicing position, which can effectively improve the anti-slip of the overall structure of the inner liner, stably fix the inner liner in the core chamber, and ensure that the inner liner does not displace during the pressurization process. At the same time, it ensures that the splicing position of the inner liner has better sealing performance, effectively reducing the risk of core fragmentation caused by collision during the processes of loading, pressurization, and removal.

[0035] 2. It can efficiently achieve liquid separation and save liquid: The evenly distributed circular holes on the inner liner wall ensure that the liquid can flow evenly when injected and can be quickly discharged when the core is removed, thereby reducing liquid sputtering and waste and improving the use efficiency of the test liquid.

[0036] 3. It is convenient to operate and has good repeatability: The inner liner can be easily separated into two halves, facilitating the quick loading and removal of the core.

[0037] 4. In addition, by setting a sealing layer between the inner liner and the core chamber, the inner liner always maintains stability and sealing performance when inserted into the core chamber, ensuring the stability of the test conditions and the repeatability of the data.

[0038] 5. By optimizing the aperture of the holes on the inner liner, it can also ensure the best balance between the liquid flow rate and the core protection effect.

[0039] Reference is made to the following description and the accompanying drawings, which disclose in detail specific embodiments of the present invention and indicate the ways in which the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents. Features described and / or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention under the teaching of the present invention.

[0041] Figure 1 It is a schematic structural diagram of a core evacuation, pressurization, and saturation device provided in an embodiment of the present application;

[0042] Figure 2 It is a cross-sectional view of a core evacuation, pressurization, and saturation device provided in an embodiment of the present application after removing the upper cover.

[0043] Figure 3 It is a top view of the core chamber of a core evacuation, pressurization and saturation device provided in an embodiment of the present application without the inner liner inserted;

[0044] Figure 4 It is a front view of the inner liner of a core evacuation, pressurization and saturation device provided in an embodiment of the present application;

[0045] Figure 5 It is a top view of the inner liner of a core evacuation, pressurization and saturation device provided in an embodiment of the present application;

[0046] Figure 6 It is a bottom view of the inner liner of a core evacuation, pressurization and saturation device provided in an embodiment of the present application;

[0047] Figure 7 It is Figure 4 a partial enlarged schematic view of the first locking portion at I in

[0048] Figure 8 It is Figure 4 a partial enlarged schematic view of the second locking portion at I in

[0049] Figure 9 It is a step flow chart of a method for optimizing the aperture of an inner liner provided in an embodiment of the present application.

[0050] Reference numerals of the present application:

[0051] 1. Core chamber;

[0052] 11. First inner wall;

[0053] 12. Second inner wall;

[0054] 2. Upper cover;

[0055] 21. Pressure indicator;

[0056] 3. Inner liner;

[0057] 30. Opening;

[0058] 31. First half cylinder;

[0059] 310. First locking portion;

[0060] 311. First sawtooth;

[0061] 3111. First convex portion;

[0062] 3112. First concave portion;

[0063] 32. Second half cylinder;

[0064] 320. Second locking part;

[0065] 321. Second sawtooth;

[0066] 3211. Second convex part;

[0067] 3212. Second concave part;

[0068] 33. Bottom wall;

[0069] 34. Side wall;

[0070] 4. Sealing layer;

[0071] 5. Buffer layer;

[0072] 6. Symmetry plane. Detailed implementation manners

[0073] The following will combine the accompanying drawings and specific embodiments to elaborate in detail on the technical solutions of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications made by those skilled in the art to the present invention all fall within the scope defined by the appended claims of this application.

[0074] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific implementation manners and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0076] The present invention provides a core evacuation, pressurization and saturation device and a method for optimizing the aperture of its inner liner. The inner liner has better anti-slip performance and sealing performance, can effectively protect the core, and at the same time can achieve efficient separation of liquids, improve the test accuracy and operation convenience. In addition, it can ensure that the liquid flow rate and the core protection effect reach the best balance.

[0077] Please refer to comprehensively Figures 1 to 8, in the embodiments of the specification of the present application, a core evacuation, pressurization and saturation device is provided. Among them, the core evacuation, pressurization and saturation device may include: a hollow core chamber 1 and an inner liner 3 disposed inside the core chamber 1. The inner liner 3 includes: a cylindrical main body, and a plurality of openings 30 for fluid circulation are formed on the main body; the main body has a symmetry plane 6 along the longitudinal direction, and the main body includes: a first half cylinder 31 and a second half cylinder 32 disposed opposite to each other along the symmetry plane 6. The first half cylinder 31 has a first docking surface facing the second half cylinder 32, and a first locking portion 310 is disposed on the first docking surface. The second half cylinder 32 has a second docking surface facing the first half cylinder 31, and a second locking portion 320 is disposed on the second docking surface. The inner liner 3 has a separated state and a closed state. When the inner liner 3 is in the closed state, the first locking portion 310 and the second locking portion 320 are in contact with and engaged with each other to form a fitting structure in cooperation.

[0078] As Figure 1 and Figure 2 shown, in this embodiment, the core evacuation, pressurization and saturation device mainly includes a core chamber 1 and an inner liner 3 inside the core chamber 1.

[0079] Please refer to Figure 4 , Figure 5 and Figure 6 , where the inner liner 3 may include: a cylindrical main body with one end open and one end closed. The main body has a symmetry plane 6 along the longitudinal direction. The main body may include a first half cylinder 31 and a second half cylinder 32 that are docked with each other along the symmetry plane 6. The structures of the first half cylinder 31 and the second half cylinder 32 are basically the same.

[0080] Among them, the first half cylinder 31 has a first docking surface facing the second half cylinder 32, and a first locking portion 310 is disposed on the first docking surface. The second half cylinder 32 has a second docking surface facing the first half cylinder 31, and a second locking portion 320 is disposed on the second docking surface.

[0081] When the inner liner 3 is in the closed state, that is, after the first half cylinder 31 and the second half cylinder 32 are joined together, the first locking portion 310 and the second locking portion 320 are in contact with and engaged with each other to form a fitting structure in cooperation. When in use, by using this fitting structure, it can be ensured that a completely meshed continuous contact surface is formed at the docking position of the first half cylinder 31 and the second half cylinder 32, so as to effectively improve the anti-slip of the overall structure of the inner liner 3, and the inner liner 3 can be stably fixed inside the core chamber 1 to ensure that the inner liner 3 does not displace during the pressurization process; at the same time, it ensures that the inner liner 3 has better sealing performance at the splicing position.

[0082] Please refer to Figure 7 and Figure 8, in one embodiment, the first locking portion 310 includes a plurality of first sawteeth 311 formed on the first docking surface along the longitudinal direction of the body. The first sawteeth 311 include: a first convex portion 3111 and a first concave portion 3112 that are spaced apart by a first distance along the longitudinal direction; the second locking portion 320 includes a plurality of second sawteeth 321 formed on the second docking surface along the longitudinal direction of the body. The second sawteeth 321 include: a second convex portion 3211 and a second concave portion 3212 that are spaced apart by the first distance along the longitudinal direction; when the inner container 3 is in a closed state, the first convex portion 3111 contacts and engages with the second concave portion 3212, and the second convex portion 3211 contacts and engages with the first concave portion 3112.

[0083] As Figure 7 shown, in this embodiment, the first locking portion 310 may include a plurality of first sawteeth 311 formed on the first docking surface along the longitudinal direction of the body. The first sawteeth 311 include: a first convex portion 3111 and a first concave portion 3112 that are spaced apart by a first distance along the longitudinal direction. The shape of the first sawteeth 311 may be such that one side is a slant line and the other side is a straight line, or both sides are slant lines, etc. Among them, when both sides are slant lines, the inclination angles of the two slant lines may be the same.

[0084] As Figure 8 shown, in this embodiment, the second locking portion 320 may include a plurality of second sawteeth 321 formed on the second docking surface along the longitudinal direction of the body. The second sawteeth 321 include: a second convex portion 3211 and a second concave portion 3212 that are spaced apart by the first distance along the longitudinal direction. The shape of the second sawteeth 321 may be such that one side is a slant line and the other side is a straight line, or both sides are slant lines, etc. Among them, when both sides are slant lines, the inclination angles of the two slant lines may be the same.

[0085] When the inner container 3 is in a closed state, the first convex portion 3111 contacts and engages with the second concave portion 3212, and the second convex portion 3211 contacts and engages with the first concave portion 3112, forming a fitting interface at the splicing position. This fitting structure is the joint area formed by the left and right halves of the inner container 3 at the serrated interlocking part, that is, the continuous contact surface formed after the convex and concave portions of each sawtooth are completely engaged. Since this fitting interface is located at the splicing edge of the inner container 3, it directly determines the anti-slip and sealing performance of the overall structure of the inner container 3.

[0086] In this embodiment, by adopting a serrated interlocking structure at the splicing edge of the inner container 3, self-positioning and anti-lateral slipping of the inner container 3 can be achieved. During high-pressure testing, the serrations on the left and right halves mesh with each other, ensuring the stable fixation of the inner container 3 in the rock chamber 1, thereby preventing the brittle core from being impacted due to the displacement of the inner container 3. Different from common mechanical locking methods, this application is optimized for the requirements of core protection and has been experimentally verified. By adopting a serrated interlocking structure at the splicing edge of the inner container 3, the inner container 3 can not only withstand the applied pressure (up to 80 MPa can be designed), but also the overall displacement of the inner container 3 is measured to be within 0.2 mm in actual tests, effectively reducing the risk of core breakage.

[0087] As Figure 7 shown, in one embodiment, the serration sizes of the first serrations 311 and the second serrations 321 are the same, and the serration width b of the first serrations 311 or the second serrations 321 is 2.5 ± 0.5 mm; the serration height h is 1.5 ± 0.5 mm, and the tooth gap w is 5 mm.

[0088] In this embodiment, taking the first serrations 311 as an example for illustration, the serration width b of the first serrations 311 is between 2.0 mm and 3 mm, the serration height h of the first serrations 311 is 1.5 ± 0.5 mm, and the tooth gap w of the first serrations 311 is 5 mm. The serration width b of the above-mentioned first serrations 311 is the designed width. The serration height h of the above-mentioned first serrations 311 is the designed height, and the tooth gap w of the above-mentioned first serrations 311 is the designed tooth gap.

[0089] More specifically, each serration width b is designed to be 2.5 ± 0.2 mm; the serration height h is 1.5 ± 0.2 mm, and the tooth gap w is designed to be 5 mm.

[0090] The inventor of this application has preliminarily verified the above preferred data through finite element simulation (FEA). The simulation results show that under the working condition of 15 MPa, the local stress does not exceed the safety limit (about 80 MPa) of the material of the inner container 3, and at the same time, the stability of long-term repeated use is ensured.

[0091] It should be noted that the interlocking structure formed by the cooperation of the above-mentioned first serrations 311 and the second serrations 321 of this application is designed according to the special requirements of the core saturation test equipment, and has significant differences from the common interlocking structures in other fields (such as mechanical transmission or furniture connection) in terms of geometric ratio, force direction, etc.

[0092] When the inner container 3 does not need to be inserted into the rock chamber 1, the two halves of the inner container 3 (i.e., the first half cylinder 31 and the second half cylinder 32) can be separated by a simple operation, which is convenient for directly taking and placing the core.

[0093] In this embodiment, the body of the inner container 3 includes a bottom wall 33 and a side wall 34 surrounding the bottom wall 33, and a plurality of the openings 30 are uniformly distributed on the bottom wall 33 and the side wall 34. The openings 30 are used to achieve efficient separation of liquid and core.

[0094] In this embodiment, the opening 30 can be a round hole. When the opening 30 is a round hole, it is easy to drill and process in batches, the tolerance is easy to control, and the cost is low; and the stress distribution is uniform when the circular structure is under pressure, reducing local stress concentration; in addition, the circular hole can ensure uniform distribution and rapid discharge of liquid in the inner container 3.

[0095] The diameter of the opening 30 is 3 mm to 5 mm. Specifically, the diameter of the round hole can be designed to be 4 mm, and the center-to-center distance between adjacent two of the openings 30 is 6 mm, that is, the center-to-center distance between holes can be designed to be 6 mm. When using round holes with a diameter of 4 mm and the center-to-center distance between holes can be designed to be 6 mm, a plurality of openings 30 are distributed in a regular grid pattern, which can not only ensure that when injecting liquid, the liquid can uniformly enter the inner container 3 and fully wet the core, but also when taking out the core, the liquid and the core can be quickly separated through the natural flow of the holes, avoiding the liquid being poured out together with the core and reducing sputtering and waste.

[0096] In one embodiment, the inner container 3 is made of polyether ether ketone.

[0097] In this embodiment, the inner container 3 can be made of a material with high chemical resistance, excellent mechanical strength and temperature resistance, such as polyether ether ketone (PEEK). The PEEK material has good corrosion resistance and wear resistance, and at the same time its toughness can provide effective buffer protection for brittle cores. Of course, the material of the inner container can also be in other forms, not limited to the above description. Those skilled in the art may make other changes under the inspiration of the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should all be covered within the protection scope of this application.

[0098] In this embodiment, when the inner container 3 is made of PEEK material, the inherent toughness of the material enables the inner wall of the inner container 3 to absorb part of the energy when being impacted by the core. In addition, the wall thickness of the inner container 3 can be 4 mm, and the wall thickness dimension of the inner container 3 is an optimized dimension, which not only meets the structural rigidity requirements but also can provide a certain buffer effect.

[0099] In one embodiment, a buffer layer 5 is provided on the inner wall of the inner container 3.

[0100] In an embodiment, by providing a buffer layer 5 on the inner wall of the inner cylinder 3, the buffering effect on the core can be improved, thereby protecting the core and preventing the core from being subjected to excessive mechanical shock during the insertion into the inner cylinder 3. Specifically, the buffer layer 5 can be a layer of silica gel buffer layer 5 coated on the inner wall of the inner cylinder 3. More specifically, the buffer layer 5 is a silica gel buffer layer 5 with a thickness of 0.5 mm. Preliminary finite element simulation shows that after adding the 0.5 mm silica gel buffer layer 5, the peak value of the local force on the core can be reduced by 15%, thus significantly reducing the risk of mechanical shock generated during the loading and pressurization processes.

[0101] As Figure 3 shown, in one embodiment, a sealing layer 4 is provided between the outer wall of the inner cylinder 3 and the inner wall of the core chamber 1. More specifically, the sealing layer 4 can be a polyurethane sealing layer with a thickness of 5 mm.

[0102] In this embodiment, a sealing layer 4 can be provided between the inner cylinder 3 and the core chamber 1. Specifically, the sealing layer 4 is used to wrap the inner cylinder 3 to ensure that the core chamber 1 and the inner cylinder 3 are closely fitted, thereby better fixing the position of the core.

[0103] Overall, the core evacuation pressurization saturator provided in the embodiments of the present application has the following technical effects:

[0104] 1. It can effectively protect the core: The left and right halves of the inner cylinder 3 are spliced and a fitting structure is formed at the splicing position, thereby effectively improving the anti-slip of the overall structure of the inner cylinder 3, being able to stably fix the inner cylinder 3 in the core chamber 1, ensuring that the inner cylinder 3 does not displace during the pressurization process; at the same time, ensuring better sealing at the splicing position of the inner cylinder 3, effectively reducing the risk of fragmentation of the core caused by collision during the loading, pressurization, and removal processes.

[0105] 2. It can efficiently achieve liquid separation and save liquid: The design of the uniformly distributed circular holes on the wall of the inner cylinder 3 ensures that the liquid can flow evenly when injected and can be quickly discharged when the core is taken out, thereby reducing liquid splashing and waste and improving the usage efficiency of the test liquid.

[0106] 3. It is convenient to operate and has good repeatability: The inner cylinder 3 can be easily separated into two halves, facilitating the quick loading and removal of the core.

[0107] 4. In addition, by providing a sealing layer 4 between the inner cylinder 3 and the core chamber 1, the inner cylinder 3 always maintains stability and sealing when inserted into the core chamber 1, ensuring the stability of the test conditions and the repeatability of the data.

[0108] The core evacuation, pressurization and saturation device, in addition to including the inner container 3 of the core evacuation, pressurization and saturation device described above, further includes a core chamber 1 for accommodating the inner container 3. The upper end of the core chamber 1 is an open end, and an upper cover 2 is detachably arranged on the open end. A pressure indicator 21 is arranged on the upper cover 2. Among them, the upper cover 2 can be arranged at the open end of the core chamber 1 by means of threaded connection. The inner wall of the core chamber 1 has a first inner wall 11 close to the open end and a second inner wall 12 far from the open end. The second inner wall 12 can be used to form a containing cavity for accommodating the core. The thickness of the first inner wall 11 can be less than the thickness of the second inner wall 12. An internal thread can be arranged on the first inner wall 11, and an external thread matching the above internal thread can be arranged on the upper cover 2.

[0109] When performing core testing, take the core to be tested, first place it on one side of the pre-separated inner container 3, assemble the two halves of the inner container 3, and interlock the central serrated structures. At the same time, insert the inner container 3 into the core chamber 1 to ensure that the inner container 3 is firmly closed with the inner wall of the core chamber 1, and then cover the upper cover 2.

[0110] After that, perform evacuation, pressurization and liquid injection saturation operations. Use the pressure indicator 21 to read the pressure inside the core chamber 1. After the test is completed, open the outer cover of the core chamber 1, draw out the inner container 3, and the liquid inside the inner container 3 will remain inside the core chamber 1 through the holes. Separate the inner container 3 into two halves to facilitate direct removal of the core. At the same time, due to the holes in the inner container 3, the attached liquid will flow out quickly, achieving the effect of separating the liquid from the core.

[0111] As Figure 9 shown, in this embodiment, a method for optimizing the aperture of the inner container of the core evacuation, pressurization and saturation device is further provided. The method for optimizing the aperture of the inner container may include the following steps:

[0112] Step S10: Determine the single-hole effective flow area based on the designed aperture of the opening 30 of the inner container 3, and determine the average number of holes per unit area based on the designed center distance between holes of the opening 30;

[0113] Step S12: Determine the unit-area effective flow area based on the single-hole effective flow area and the average number of holes per unit area;

[0114] Step S14: Determine the optimized aperture based on the designed aperture, the unit-area effective flow area, the known target opening ratio, and the first correspondence relationship between the optimized aperture and the designed aperture, the unit-area effective flow area, and the known target opening ratio. The first correspondence relationship is:

[0115] d optimal =d0×(P target / P ref ) 1 / 2 ;

[0116] In the above formula: d optimal represents the optimized aperture;

[0117] d0 represents the designed aperture;

[0118] P target represents the target opening ratio required by the experiment;

[0119] P ref represents the effective flow area per unit area determined.

[0120] In this embodiment, the overall size of the inner liner 3, the opening size, the hole spacing, etc. will directly affect the liquid flow area and the liquid drainage efficiency.

[0121] The inventor of the present application established a mathematical model for aperture optimization design. Based on the basic principles of fluid dynamics and geometric area relationships, after preliminary numerical simulation and small sample test verification, the first correspondence relationship between the above-mentioned optimized aperture, the designed aperture, the effective flow area per unit area, and the known target opening ratio was obtained, so as to be able to guide the size adjustment of the aperture 30 of the opening, and ensure that the liquid flow rate and the core protection effect reach the best balance.

[0122] The following is illustrated by a specific embodiment.

[0123] Taking the diameter designed to be 4 mm and the center distance between the designed holes to be 6 mm as an example:

[0124] Single-hole effective flow area: A0 = π×(4mm / 2) 2 ≈12.57mm 2 ; If the unit area is 6mm×6mm, the average number of holes N per unit area is approximately 1 / 36 (holes / mm 2 ), and the effective flow area per unit area Aeff≈(12.57 / 36)≈0.35 (i.e., an opening ratio of 35%); for different experimental conditions (such as different pressure and flow rate requirements);

[0125] The following first relational formula can be used for aperture optimization:

[0126] d optimal = d0×(P target / P ref ) 1 / 2 ;

[0127] wherein, d0 is the reference aperture (here it is 4 mm), P ref is the reference opening ratio (here it is 35%, obtained from Aeff), and P target is the target opening ratio required by the experiment.

[0128] If it is desired to achieve specific liquid flow rate and pressure conditions to protect the core while ensuring uniform liquid injection, the aperture can be optimized through the above first relationship to obtain the best setting in practical applications, i.e., d optimal is the best aperture scheme to meet specific experimental requirements.

[0129] The aperture optimization method for the inner liner of the core evacuation, pressurization, and saturation device provided in the embodiments of the present application can further optimize and refine on the basis of the designed aperture size to ensure the best balance between the liquid flow rate and the core protection effect.

[0130] It should be noted that in the description of the present application, terms such as "first" and "second" are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0131] The above-described embodiments in this specification are all described in a progressive manner. The same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0132] The above are only several embodiments of the present invention. Although the disclosed embodiments of the present invention are as above, the content is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the present invention. Any person skilled in the art in the technical field to which the present invention pertains can make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed by the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A core evacuation, pressurization and saturation device, characterized in that, The core evacuation pressurization saturator includes a hollow core chamber and an inner container disposed in the core chamber. The inner container includes: A cylindrical body with a plurality of openings formed thereon for fluid circulation; The body has a symmetry plane along the longitudinal direction. The body includes a first half cylinder and a second half cylinder oppositely disposed along the symmetry plane. The first half cylinder has a first docking surface facing the second half cylinder, and a first locking portion is provided on the first docking surface. The second half cylinder has a second docking surface facing the first half cylinder, and a second locking portion is provided on the second docking surface. The inner container has a separated state and a closed state. When the inner container is in the closed state, the first locking portion and the second locking portion come into contact and engage with each other to form a fitting structure.

2. The core evacuation pressurization saturator according to claim 1, wherein The first locking portion includes a plurality of first sawteeth formed on the first docking surface along the longitudinal direction of the body. The first sawteeth include a first convex portion and a first concave portion spaced apart by a first distance along the longitudinal direction; The second locking portion includes a plurality of second sawteeth formed on the second docking surface along the longitudinal direction of the body. The second sawteeth include a second convex portion and a second concave portion spaced apart by the first distance along the longitudinal direction; When the inner container is in the closed state, the first convex portion comes into contact and engages with the second concave portion, and the second convex portion comes into contact and engages with the first concave portion.

3. The core evacuation, pressurization and saturation device according to claim 2, characterized in that, The sawtooth sizes of the first sawteeth and the second sawteeth are the same. The sawtooth width of the first sawteeth or the second sawteeth is 2.5 ± 0.5 mm; the sawtooth height is 1.5 ± 0.5 mm, and the tooth gap is 5 mm.

4. The core evacuation, pressurization and saturation device according to claim 1, characterized in that, The body includes a bottom wall and a side wall surrounding the bottom wall. The plurality of openings are uniformly distributed on the bottom wall and the side wall.

5. The core evacuation, pressurization and saturation device according to claim 4, characterized in that, The openings are round holes with a diameter of 3 mm to 5 mm.

6. The core evacuation, pressurization and saturation device according to claim 5, wherein The center-to-center distance between adjacent two of the openings is 6 mm, and the plurality of openings are distributed in a regular grid pattern.

7. The core evacuation, pressurization and saturation device according to claim 1, characterized in that, The inner container is made of polyether ether ketone.

8. The core evacuation pressurization saturator according to claim 1, wherein, A buffer layer is provided on the inner wall of the inner container.

9. The core evacuation, pressurization and saturation device according to claim 8, characterized in that, The buffer layer is a 0.5 mm thick silica gel buffer layer.

10. The core evacuation, pressurization and saturation device according to claim 1, characterized in that, A sealing layer is provided between the outer wall of the inner container and the inner wall of the core chamber.

11. The core evacuation, pressurization and saturation device according to claim 10, characterized in that, The sealing layer is a 5 mm thick polyurethane sealing layer.

12. The core evacuation, pressurization and saturation device according to claim 1, wherein, The upper end of the core chamber is an open end, and an upper cover is detachably provided on the open end. A pressure indicator is provided on the upper cover.

13. An aperture optimization method for the inner liner of the core evacuation pressurization saturator according to any one of claims 1 to 12, characterized in that, The aperture optimization method of the inner container includes: Determining the single-hole effective flow area based on the designed aperture of the openings of the inner container, and determining the average number of holes per unit area based on the designed center-to-center distance between the openings; Determining the effective flow area per unit area based on the single-hole effective flow area and the average number of holes per unit area; Determining the optimized aperture based on the designed aperture, the effective flow area per unit area, and the known target opening ratio, and the first corresponding relationship between the optimized aperture and the designed aperture, the effective flow area per unit area, and the known target opening ratio. The first corresponding relationship is: d optimal = d0×(P target / P ref ) 1 / 2 In the above formula: d optimal represents the optimized aperture; d0 represents the designed aperture; P target represents the target opening ratio required by the experiment; P ref represents the determined effective flow area per unit area.

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