Core evacuation pressurized saturator and pore size optimization method of its inner liner

Abstract

The application discloses a core evacuation pressurization saturator and a pore size optimization method of an inner container thereof. The core evacuation pressurization saturator comprises a hollow core chamber and an inner container arranged in the core chamber. The body of the inner container is in a cylindrical shape and is provided with a plurality of openings for fluid circulation. The body comprises a first half cylinder and a second half cylinder which are oppositely arranged along a symmetry plane. The first half cylinder is provided with a first abutting surface facing the second half cylinder, and the first abutting surface is provided with a first locking part. The second half cylinder is provided with a second abutting surface facing the first half cylinder, and the second abutting surface is provided with a second locking part. The inner container has a closed state. When the inner container is in the closed state, the first locking part and the second locking part are in contact and engagement, and a fitting structure is formed. The application can ensure core saturation, protect the core effectively, separate liquid efficiently, improve test accuracy and operation convenience, and ensure that the liquid flow rate and the core protection effect reach the best balance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of core testing equipment, and in particular to a core evacuation pressurization saturator and a pore size optimization method for an inner container thereof. BACKGROUND

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

[0003] Currently, a core evacuation pressurization saturator for core physical property testing mainly adopts a single cavity structure, and a core to be tested is directly placed in a core chamber, so as to make the core fully saturated through vacuumizing, pressurizing and liquid injection, and then to determine parameters such as porosity. However, the inventors have found that the structure of the existing core evacuation pressurization saturator has many defects:

[0004] (1) Insufficient protection of the core: the core of shale with high brittleness and the like is easily broken or damaged due to impact and friction generated in the processes of loading, pressurizing and pouring when directly placed in the core chamber, thereby affecting the accuracy and repeatability of the test results.

[0005] (2) Liquid waste and splashing problems: in the processes of liquid injection and discharge, liquid often splashes during operation due to direct contact between the core and the liquid, which not only wastes the test liquid, but also may cause the liquid to penetrate into other parts of the equipment, thereby interfering with the experimental environment.

[0006] (3) Difficult to take out and place the core: since the core and the liquid are in the same closed space in the core evacuation pressurization saturator, a large amount of liquid often remains when the core is taken out, thereby increasing the operation complexity and the risk of subsequent data interference.

[0007] Therefore, it is urgent to improve the existing core evacuation pressurization saturator to solve at least one of the above problems. SUMMARY

[0008] In view of the defects of the prior art, the present application provides a core evacuation pressurization saturator and a pore size optimization method for an inner container thereof, which has better anti-slippage and sealing properties, can effectively protect the core, can realize efficient separation of the liquid, and can improve the test accuracy and operation convenience, and can also ensure that the liquid flow rate and the core protection effect reach the best balance.

[0009] The specific technical scheme of the present application is as follows:

[0010] The application discloses a core evacuating and pressurizing saturator which comprises a hollow core chamber and a liner arranged in the core chamber, wherein the liner comprises a cylindrical body provided with a plurality of openings for fluid communication; the body has a longitudinal direction with a symmetrical plane, and comprises a first half cylinder and a second half cylinder arranged oppositely along the symmetrical plane; the first half cylinder is provided with a first abutting surface facing the second half cylinder, and the first abutting surface is provided with a first locking part; the second half cylinder is provided with a second abutting surface facing the first half cylinder, and the second abutting surface is provided with a second locking part; and the liner has a separated state and a closed state, wherein when the liner is in the closed state, the first locking part and the second locking part are in contact and engagement, and a matching structure is formed.

[0011] In a preferred embodiment, the first locking part comprises a plurality of first serrations formed on the first abutting surface along the longitudinal direction of the body, and the first serrations comprise a first convex part and a first concave part arranged at a first distance along the longitudinal direction;

[0012] The second locking part comprises a plurality of second serrations formed on the second abutting surface along the longitudinal direction of the body, and the second serrations comprise a second convex part and a second concave part arranged at the first distance along the longitudinal direction;

[0013] When the liner is in the closed state, the first convex part is in contact and engagement with the second concave part, and the second convex part is in contact and engagement with the first concave part.

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

[0015] In a preferred embodiment, the body comprises a bottom wall and a side wall surrounding the bottom wall, and the plurality of 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 3-5 mm.

[0017] In a preferred embodiment, the center distance between adjacent two openings is 6 mm, and the plurality of openings are regularly arranged in a grid shape.

[0018] In a preferred embodiment, the liner is made of polyether ether ketone.

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

[0020] In a preferred embodiment, the buffer layer is a 0.5mm thick silica gel buffer layer.

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

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

[0023] A core evacuation pressurized saturator, comprising a liner of any one of the core evacuation pressurized saturators described above, a core chamber for accommodating the liner, an upper end of the core chamber being an open end, and an upper cover being detachably arranged on the open end, and a pressure indicator being arranged on the upper cover.

[0024] A pore size optimization method based on the liner of any one of the core evacuation pressurized saturators described above, the pore size optimization method comprising:

[0025] determining a single-hole effective flow area based on a design pore size of the open hole of the liner, and determining an average number of pores per unit area based on a design inter-pore center distance of the open hole;

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

[0027] determining an optimized pore size based on the design pore size, the unit-area effective flow area, and a known target open hole rate, and a first correspondence relationship between the optimized pore size and the design pore size, the unit-area effective flow area, and the known target open hole rate, the first correspondence relationship being:

[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 design pore size;

[0031] P target represents the target open hole rate required by the experiment;

[0032] P ref represents the reference open hole rate.

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

[0034] 1. The core can be effectively protected: the left and right halves of the inner container are spliced and matched to form a fitting structure at the splicing position, thereby effectively improving the anti-slippage of the overall structure of the inner container, stably fixing the inner container in the core chamber, and ensuring that the inner container does not displace during pressurization; at the same time, the inner container has good sealing performance at the splicing position, effectively reducing the risk of fragmentation of the core caused by collision during loading, pressurization and removal.

[0035] 2. Efficient liquid separation and saving: the evenly distributed circular holes on the inner container wall ensure uniform flow of the liquid when injected, and rapid discharge when the core is removed, thereby reducing liquid splashing and waste, and improving the use efficiency of the test liquid.

[0036] 3. Easy operation and good repeatability: the inner container can be easily separated into two halves, facilitating quick loading and core removal.

[0037] 4. In addition, by providing a sealing layer between the inner container and the core chamber, the inner container always maintains stability and sealing 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 inner container, the liquid flow rate and core protection effect can also be optimized to achieve the best balance.

[0039] The specific embodiments of the present application are disclosed in detail in the following description and accompanying drawings, indicating the principles of the present application can be used. It should be understood that the embodiments of the present application are not limited in scope. Within the scope and spirit of the appended claims, the embodiments of the present application include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in the same or similar way in one or more other embodiments, combined with features in other embodiments, or replaced by features in other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0040] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportions of the components in the figures are only illustrative, and are used to help understand the present application, and are not specific to the shapes and proportions of the components of the present application. Those skilled in the art can select various possible shapes and proportions to implement the present application according to specific circumstances under the guidance of the present application.

[0041] Figure 1 A structural schematic diagram of a core evacuation and pressurization saturator provided in an embodiment of the present application;

[0042] Figure 2 A cross-sectional view of a core evacuation and pressurization saturator provided in an embodiment of the present application without an upper cover;

[0043] Figure 3 This is a top view of a core chamber without an inner liner inserted in a core evacuation and pressurization saturator provided in the embodiments of this application;

[0044] Figure 4 This is a front view of the inner liner of a core evacuation and pressurization saturator provided in the embodiments of this application;

[0045] Figure 5 This is a top view of the inner liner of a core evacuation and pressurization saturator provided in the embodiments of this application;

[0046] Figure 6 A bottom view of the inner liner of a core evacuation and pressurization saturator provided in the embodiments of this application;

[0047] Figure 7 for Figure 4 A partially enlarged schematic diagram of the first locking part at point I;

[0048] Figure 8 for Figure 4 A partially enlarged schematic diagram of the second locking part at point I;

[0049] Figure 9 This is a flowchart illustrating the steps of a method for optimizing the pore size of an inner liner provided in this application.

[0050] Reference numerals in the figures of this application:

[0051] 1. Core chamber;

[0052] 11. First inner wall;

[0053] 12. Second inner wall;

[0054] 2. Top cover;

[0055] 21. Pressure indicator;

[0056] 3. Inner liner;

[0057] 30. Opening;

[0058] 31. The first half-tube;

[0059] 310. First locking part;

[0060] 311. First sawtooth;

[0061] 3111. The first convex part;

[0062] 3112. The first concave part;

[0063] 32. The second half-tube;

[0064] 320、second locking portion;

[0065] 321、second sawtooth;

[0066] 3211、second convex portion;

[0067] 3212、second concave portion;

[0068] 33、bottom wall;

[0069] 34、side wall;

[0070] 4、sealing layer;

[0071] 5、buffer layer;

[0072] 6、symmetry plane. DETAILED DESCRIPTION

[0073] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. After reading the present application, those skilled in the art can make various modifications to the equivalent forms of the present application, which fall within the scope defined by the appended claims.

[0074] It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0076] The present application provides a core evacuation pressurized saturator and a pore size optimization method for its inner container, which has better anti-slippage and sealing performance, can effectively protect the core, realize efficient separation of liquid, improve test accuracy and operation convenience, and ensure the best balance between liquid flow rate and core protection effect.

[0077] Please refer to Figures 1 to 8In the embodiments of the present application, a core evacuation pressurized saturator is provided, which can include a hollow core chamber 1 and a liner 3 arranged in the core chamber 1. The liner 3 includes a cylindrical body having a plurality of openings 30 for fluid communication. The body has a symmetry plane 6 along a longitudinal direction. The body includes a first half cylinder 31 and a second half cylinder 32 arranged opposite to each other along the symmetry plane 6. The first half cylinder 31 has a first abutting surface facing the second half cylinder 32, and the first abutting surface is provided with a first locking part 310. The second half cylinder 32 has a second abutting surface facing the first half cylinder 31, and the second abutting surface is provided with a second locking part 320. The liner 3 has a separated state and a closed state. When the liner 3 is in the closed state, the first locking part 310 and the second locking part 320 are in contact and engaged, and cooperatively form a mortise structure.

[0078] As shown in Figure 1 and Figure 2 , in the embodiments, the core evacuation pressurized saturator mainly includes a core chamber 1 and a liner 3 arranged in the core chamber 1.

[0079] Please refer to Figure 4 , Figure 5 and Figure 6 , wherein the liner 3 can include a cylindrical body having an open end and a closed end. The body has a symmetry plane 6 along a longitudinal direction. The body can include a first half cylinder 31 and a second half cylinder 32 arranged opposite to each other along the symmetry plane 6. The first half cylinder 31 and the second half cylinder 32 have substantially the same structure.

[0080] The first half cylinder 31 has a first abutting surface facing the second half cylinder 32, and the first abutting surface is provided with a first locking part 310. The second half cylinder 32 has a second abutting surface facing the first half cylinder 31, and the second abutting surface is provided with a second locking part 320.

[0081] When the liner 3 is in the closed state, i.e., the first half cylinder 31 and the second half cylinder 32 are spliced, the first locking part 310 and the second locking part 320 are in contact and engaged, and cooperatively form a mortise structure. When in use, the mortise structure can ensure that a continuous contact surface is formed at the abutting position of the first half cylinder 31 and the second half cylinder 32, thereby effectively improving the anti-slippage of the overall structure of the liner 3, stably fixing the liner 3 in the core chamber 1, and ensuring that the liner 3 does not displace during pressurization. Meanwhile, the liner 3 has good sealing performance at the splicing position.

[0082] Please refer to Figure 7 and Figure 8In one embodiment, the first locking portion 310 includes a plurality of first serrations 311 formed on the first mating surface along the longitudinal direction of the body. The first serrations 311 include a first protrusion 3111 and a first recess 3112 spaced apart along the longitudinal direction by a first distance. The second locking portion 320 includes a plurality of second serrations 321 formed on the second mating surface along the longitudinal direction of the body. The second serrations 321 include a second protrusion 3211 and a second recess 3212 spaced apart along the longitudinal direction by the first distance. When the inner liner 3 is in a closed state, the first protrusion 3111 contacts and engages with the second recess 3212, and the second protrusion 3211 contacts and engages with the first recess 3112.

[0083] like Figure 7 As shown, in this embodiment, the first locking portion 310 may include a plurality of first serrations 311 formed on the first mating surface along the longitudinal direction of the body. Each first serration 311 includes a first protrusion 3111 and a first recess 3112 spaced apart along the longitudinal direction at a first distance. The shape of the first serration 311 may be a diagonal line on one side and a straight line on the other, or both sides may be diagonal lines. When both sides are diagonal lines, the inclination angles of the diagonal lines on both sides may be consistent.

[0084] like Figure 8 As shown, in this embodiment, the second locking portion 320 may include a plurality of second serrations 321 formed on the second mating surface along the longitudinal direction of the body. Each second serration 321 includes a second protrusion 3211 and a second recess 3212 spaced apart along the longitudinal direction by the first distance. The shape of the second serration 321 may be a diagonal line on one side and a straight line on the other, or both sides may be diagonal lines. When both sides are diagonal lines, the inclination angles of the diagonal lines on both sides may be consistent.

[0085] When the inner liner 3 is in the closed state, the first protrusion 3111 contacts and engages with the second concave portion 3212, and the second protrusion 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 liner 3 at the serrated interlocking part, that is, the continuous contact surface formed after the protrusions and concave portions of each serration are fully engaged. Since this fitting interface is located at the splicing edge of the inner liner 3, it directly determines the anti-slip and sealing performance of the overall structure of the inner liner 3.

[0086] In the present embodiment, the self-positioning and anti-lateral sliding of the liner 3 can be achieved by adopting the interlocking structure of the sawtooth shape at the spliced edge of the liner 3. During the high-pressure test, the sawteeth of the left and right halves are engaged with each other, so as to ensure the stable fixation of the liner 3 in the core chamber 1, thereby preventing the impact on the brittle core due to the displacement of the liner 3. Unlike the common mechanical locking mode, the present application is optimized for the core protection requirements, and it is verified by experiments that, by adopting the interlocking structure of the sawtooth shape at the spliced edge of the liner 3, the liner 3 can not only withstand the external pressure (which can be designed up to 80 MPa), but also the overall displacement of the liner 3 is controlled within 0.2 mm in the actual test, thereby effectively reducing the risk of core damage.

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

[0088] In the present embodiment, the first sawtooth 311 is taken as an example, the sawtooth width b of the first sawtooth 311 is between 2.0 mm and 3 mm, the sawtooth height h of the first sawtooth 311 is 1.5±0.5 mm, and the tooth gap w of the first sawtooth 311 is 5 mm. The sawtooth width b of the first sawtooth 311 is the design width. The sawtooth height h of the first sawtooth 311 is the design height, and the tooth gap w of the first sawtooth 311 is the design tooth gap.

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

[0090] The above preferred data is verified by the inventors of the present application through preliminary finite element simulation (FEA), and the simulation results show that, under the condition of 15 MPa, the local stress does not exceed the safety limit (about 80 MPa) of the liner 3 material, and the stability of long-term repeated use is ensured.

[0091] It should be noted that the interlocking structure formed by the cooperation of the first sawtooth 311 and the second sawtooth 321 of the present application is designed for the special requirements of the core saturation test equipment, and is significantly different from the common interlocking structure in other fields (such as mechanical transmission or furniture connection) in terms of geometric proportion, stress direction, etc.

[0092] When the liner 3 does not need to be inserted into the core chamber 1, the two halves (i.e. the first half cylinder 31 and the second half cylinder 32) of the liner 3 can be separated by simple operation, so as to facilitate the direct taking and placing of the core.

[0093] In the embodiment, the body of the inner container 3 comprises 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 realize efficient separation of the liquid and the core.

[0094] In the embodiment, the opening 30 can be a circular hole. When the opening 30 is a circular hole, it is easy to drill and batch process, 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 the liquid in the inner container 3.

[0095] The diameter of the opening 30 is 3-5 mm. Specifically, the diameter of the circular hole can be designed to be 4 mm, and the center distance between adjacent two openings 30 is 6 mm, that is, the center distance between holes can be designed to be 6 mm. When the diameter of the circular hole is 4 mm, the center distance between holes can be designed to be 6 mm, and a plurality of openings 30 are regularly distributed in a grid shape, which not only ensures that the liquid can uniformly enter the inner container 3 and fully soak the core when the liquid is injected, but also realizes rapid separation of the liquid and the core through the natural flow of the hole when the core is taken out, avoiding the liquid from being poured out with the core, reducing splashing and waste.

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

[0097] In the 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). PEEK material has good corrosion resistance and wear resistance, and its toughness can provide effective buffer protection for brittle cores. Of course, the material of the inner container can also be other forms, and is not limited to the above description. Those skilled in the art can also make other changes under the technical essence of the present application, as long as the functions and effects achieved are the same or similar to the present application, which should be covered within the protection scope of the present application.

[0098] In the 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 impacted by the core. In addition, the wall thickness of the inner container 3 can be 4 mm, and the wall thickness of the inner container 3 is an optimized size, which meets the structural rigidity requirement and provides a certain buffering effect.

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

[0100] In an embodiment, by providing the buffer layer 5 on the inner wall of the inner container 3, the buffering effect on the core can be improved, thereby protecting the core and preventing the core from being subjected to excessive mechanical impact during insertion into the inner container 3. Specifically, the buffer layer 5 can be a layer of silica gel buffer layer 5 coated on the inner wall of the inner container 3. More specifically, the buffer layer 5 is a 0.5 mm thick silica gel buffer layer 5. Preliminary finite element simulation shows that after adding the 0.5 mm silica gel buffer layer 5, the local stress peak of the core can be reduced by 15%, thereby greatly reducing the risk of mechanical impact caused by the loading and pressurization process.

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

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

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

[0104] 1. Effectively protects the core: The left and right halves of the inner container 3 are mated and form a fitting structure at the mating position, thereby effectively improving the anti-slip of the overall structure of the inner container 3, stably fixing the inner container 3 in the core chamber 1, and ensuring that the inner container 3 does not displace during pressurization; at the same time, the inner container 3 has good sealing at the joint position, effectively reducing the risk of fragmentation of the core caused by collision during loading, pressurization and removal.

[0105] 2. Efficiently separates liquid and saves liquid: The evenly distributed circular holes on the wall of the inner container 3 ensure that the liquid flows uniformly when injected and is quickly drained when the core is removed, thereby reducing liquid splashing and waste and improving the use efficiency of the test liquid.

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

[0107] 4. In addition, by providing the sealing layer 4 between the inner container 3 and the core chamber 1, the inner container 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 pressurized saturator comprises a core chamber 1 for accommodating the inner container 3, an upper end of the core chamber 1 being an open end, and a detachable upper cover 2 being arranged on the open end of the core chamber 1, and a pressure indicator 21 being arranged on the upper cover 2. The upper cover 2 can be arranged on the open end of the core chamber 1 by a threaded connection. An inner wall of the core chamber 1 has a first inner wall 11 close to the open end and a second inner wall 12 away from the open end, and the second inner wall 12 can be used to form a containing cavity for accommodating a core. The thickness of the first inner wall 11 can be smaller than the thickness of the second inner wall 12. An inner thread can be arranged on the first inner wall 11, and an outer thread matched with the inner thread can be arranged on the upper cover 2.

[0109] During core testing, a core to be tested is first placed in one side of the pre-separated inner container 3, and then the two halves of the inner container 3 are combined and interlocked with the central serrated structure, and the inner container 3 is inserted into the core chamber 1 to ensure that the inner container 3 is tightly closed with the inner wall of the core chamber 1, and the upper cover 2 is covered.

[0110] Then, evacuation, pressurization and liquid injection saturation operations are performed. The pressure in the core chamber 1 is read by the pressure indicator 21. After the test is completed, the outer cover of the core chamber 1 is opened, the inner container 3 is pulled out, the liquid in the inner container 3 will flow out through the holes left in the core chamber 1, the inner container 3 is separated into two halves, the core can be directly taken out, and the liquid attached to the core can quickly flow out due to the holes in the inner container 3, so that the liquid and the core are separated.

[0111] As shown in Figure 9 , in the embodiment, a pore size optimization method of an inner container of a core evacuation pressurized saturator is also provided, and the pore size optimization method of the inner container can comprise the following steps:

[0112] Step S10: determining a single-hole effective flow area based on a design pore size of the opening 30 of the inner container 3, and determining an average number of pores per unit area based on a design center-to-center distance of the opening 30;

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

[0114] Step S14: determining an optimized pore size based on the design pore size, the unit-area effective flow area and a known target opening porosity, and a first correspondence relationship between the optimized pore size and the design pore size, the unit-area effective flow area and the known target opening porosity, the first correspondence relationship being:

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

[0116] d optimal represents an optimized aperture;

[0117] d0represents a design aperture;

[0118] P target represents a target opening rate required by an experiment;

[0119] P ref represents a reference opening rate.

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

[0121] The inventors of the present application establish a mathematical model, optimize the aperture design, and obtain the first corresponding relationship between the optimized aperture, the design aperture, the effective flow area per unit area, and the known target opening rate based on the basic principles of fluid dynamics and the geometric area relationship after preliminary numerical simulation and small sample test verification, thereby being able to guide the size adjustment of the aperture 30 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 a diameter design of 4 mm and a design hole center distance design of 6 mm as an example:

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

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

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

[0127] wherein d0is a reference aperture (here, 4mm), P ref is a reference opening rate (here, 35%, obtained from Aeff), and P target is a target opening rate required by an experiment.

[0128] If it is desired to achieve a specific liquid flow rate and pressure condition, thereby protecting the core while ensuring uniform injection of the liquid, the pore size can be optimized by the above first relationship to obtain the best setting in practical applications, i.e. d optimal is the best pore size scheme that meets the requirements of a specific experiment.

[0129] The pore size optimization method of the inner container of the core evacuation pressurized saturator provided in the embodiments of the present application can further optimize and refine the pore size design size, and ensure that the liquid flow rate and the core protection effect reach the best balance.

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

[0131] The above various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0132] The above is only a few embodiments of the present application, although the embodiments disclosed by the present application are as above, but the content is only for the convenience of understanding the embodiments adopted by the present application, and is not used to limit the present application. Any person skilled in the art of the present application can make any modification and change in the form and details of the embodiments without departing from the spirit and scope of the present application, but the patent protection scope of the present application shall be subject to the scope defined by the appended claims.

Claims

1. A method of optimizing the pore size of a liner of a core evacuating pressurized saturator, characterized in that, The core evacuation pressurized saturator comprises a hollow core chamber and a liner arranged in the core chamber, the liner comprises: a cylindrical body, a plurality of openings for fluid communication are formed on the body, the body comprises a bottom wall and a side wall surrounding the bottom wall, and a plurality of openings are uniformly distributed on the bottom wall and the side wall; the body has a symmetry plane along the longitudinal direction, the body comprises: a first half cylinder and a second half cylinder arranged opposite along the symmetry plane, the first half cylinder has a first abutting surface facing the second half cylinder, the first abutting surface is provided with a first locking part, the second half cylinder has a second abutting surface facing the first half cylinder, the second abutting surface is provided with a second locking part, the liner has a separation state and a closed state, when the liner is in the closed state, the first locking part and the second locking part are in contact and engaged, and a matching structure is formed; the pore size optimization method of the liner comprises: determining a single-hole effective flow area based on the design pore size of the opening of the liner, and determining the average number of holes in a unit area based on the design center distance between the openings; determining the unit area effective flow area based on the single-hole effective flow area and the average number of holes in a unit area; determining the optimized pore size based on the design pore size, the unit area effective flow area and the known target opening rate, and a first corresponding relationship between the optimized pore size and the design pore size, the unit area effective flow area and the known target opening rate, the first corresponding relationship is: d optimal = d0 x (P target / P ref ) 1 / 2 In the above formula: d optimal represents the optimized aperture; d0 represents the design pore size; P target Target open area as required by the experiment; P ref represents the reference open porosity.

2. The pore size optimization method of the liner of the core evacuation pressurized saturator according to claim 1, wherein the first locking part comprises a plurality of first sawteeth formed on the first abutting surface along the longitudinal direction of the body, the first sawteeth comprise: a first convex part and a first concave part arranged at a first distance along the longitudinal direction; the second locking part comprises a plurality of second sawteeth formed on the second abutting surface along the longitudinal direction of the body, the second sawteeth comprise: a second convex part and a second concave part arranged at the first distance along the longitudinal direction; when the liner is in the closed state, the first convex part is in contact and engaged with the second concave part, and the second convex part is in contact and engaged with the first concave part.

3. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 2, wherein, The sawtooth size of the first sawteeth and the second sawteeth is the same, the sawtooth width of the first sawteeth or the second sawteeth is 2.5±0.5mm; the sawtooth height is 1.5±0.5mm, and the tooth gap is 5mm.

4. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 1 wherein, The opening is a circular hole, and the diameter of the opening is 3-5mm.

5. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 4 wherein, The center distance between adjacent two openings is 6mm, and a plurality of openings are regularly distributed in a grid shape.

6. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 1 wherein, The liner is made of polyether ether ketone.

7. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 1 wherein, A buffer layer is arranged on the inner wall of the liner.

8. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 7 wherein, The buffer layer is a 0.5mm thick silica gel buffer layer.

9. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 1 wherein, A sealing layer is arranged between the outer wall of the liner and the inner wall of the core chamber.

10. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 9, wherein, The sealing layer is a 5mm thick polyurethane sealing layer.

11. The method of optimizing the pore size of the liner of a core evacuatable pressurizable saturator of claim 1 wherein, The upper end of the core chamber is an open end, and a detachable upper cover is arranged on the open end, and a pressure indicator is arranged on the upper cover.

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