CN108489879B - Core holder for permeability detection - Google Patents
Core holder for permeability detection Download PDFInfo
- Publication number
- CN108489879B CN108489879B CN201810119660.XA CN201810119660A CN108489879B CN 108489879 B CN108489879 B CN 108489879B CN 201810119660 A CN201810119660 A CN 201810119660A CN 108489879 B CN108489879 B CN 108489879B
- Authority
- CN
- China
- Prior art keywords
- pressurizing
- core
- shell
- accommodating cavity
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
Abstract
The invention provides a rock core holder for permeability detection, which is characterized in that a shell, a pressurizing device, an air guide device and a sealing device are arranged; a square accommodating cavity for accommodating the rock core is formed in the shell; the pressurizing device is arranged on the shell and comprises a first pressurizing piece, a second pressurizing piece and a third pressurizing piece which respectively extend along the vertical direction, the longitudinal direction and the transverse direction of the accommodating cavity; the first pressurizing piece, the second pressurizing piece and the third pressurizing piece can realize true triaxial stress loading on the rock core; the air guide device is communicated with the accommodating cavity and is used for conducting air pressure to the rock core; the sealing device is arranged between the pressurizing device and the shell and used for sealing the accommodating cavity. During testing, the first pressurizing piece, the second pressurizing piece and the third pressurizing piece can respectively apply normal stress to the rock core in the vertical direction, the longitudinal direction and the transverse direction, stress conditions of different stratums can be simulated by adjusting the stress magnitude, and permeability of the same rock core in different directions can be measured by changing the placing direction of the rock core, so that the rock core is saved.
Description
Technical Field
The invention relates to the technical field of unconventional natural gas engineering, in particular to a core holder for permeability detection.
Background
Shale gas is unconventional natural gas which is in an adsorption, free or dissolved state and is added into shale, the distribution range of the shale gas is wide, the shale gas accounts for about 50% of the total amount of global natural gas resources, and the exploration prospect is very wide. The permeability is one of important physical parameters of a shale gas reservoir, and whether the permeability value can be accurately obtained is one of bottlenecks which restrict development of the shale gas reservoir.
In the prior art, the core holder comprises a round steel barrel, a round rubber sleeve arranged in the round steel barrel, a plug and a pressurizing rod, wherein the round rubber sleeve is sleeved on the periphery of the core, and a sealed annular space is formed between the round steel barrel and the round rubber sleeve; the plug and the pressure rod are respectively positioned at two ends of the round steel barrel, a central through hole for gas to pass through is formed in the plug and the pressure rod, and the pressure rod can move along the axial direction to apply axial force to the rock core. During the test, it is cylindric to process the rock core to put into circular rubber sleeve with it, then inject high-pressure liquid into the annular space, make circular rubber sleeve shrink and rock core contact, thereby exert to the rock core and encircle axial confining pressure, then can exert axial force for the rock core through the drive pressure bar, at last through the central through hole of pressure bar to rock core input gas, partial gas passes the rock core along the axial and gets into end cap central through hole, through the parameter of gas in detecting end cap and the pressure bar central through hole, can obtain the permeability of rock core.
However, the core holder in the prior art can only apply axial pressure and circumferential confining pressure to the core, and the pressure of the core in the formation is not the axial pressure and the confining pressure, so that the core holder cannot accurately simulate the stress condition of the formation, and the permeability obtained by the test is greatly different from that under the real condition.
Disclosure of Invention
The invention provides a rock core holder for permeability detection, which aims to solve the problem that the formation stress condition cannot be accurately simulated.
The invention provides a core holder for permeability detection, which comprises: the device comprises a shell, a pressurizing device, an air guide device and a sealing device; an accommodating cavity for accommodating the rock core is formed in the shell, and the accommodating cavity is square; the pressurizing device is arranged on the shell and comprises a first pressurizing part, a second pressurizing part and a third pressurizing part which respectively extend along the vertical direction, the longitudinal direction and the transverse direction of the accommodating cavity; one end of the first pressurizing piece extends into the accommodating cavity so as to apply vertical force to the core; one end of the second pressure piece extends into the containing cavity to apply longitudinal force to the core; one end of the third pressurizing piece extends into the containing cavity to apply transverse force to the core; the air guide device is communicated with the accommodating cavity and is used for conducting air pressure; the sealing device is arranged between the pressurizing device and the shell and used for sealing the accommodating cavity.
The core holder for permeability testing as described above, wherein the first pressure member comprises: the first pressure plate is positioned in the accommodating cavity and is used for being in contact with the core; the second pressing member includes: the second pressure plate is positioned in the accommodating cavity and is used for contacting with the core.
The core holder for permeability detection is characterized in that the end surface of the third pressurizing piece facing the accommodating cavity is provided with a third pressurizing surface for contacting with the core; the air guide device comprises: the first air guide pipe penetrates through the third pressurizing part and penetrates through the third pressurizing surface, and is used for inputting air into the accommodating cavity; the second gas guide pipe penetrates through the shell, penetrates through the inner surface of the shell opposite to the third pressurizing surface and is used for collecting gas penetrating through the rock core.
The core holder for permeability detection is characterized in that an air inlet groove is formed in the third pressurizing surface, and one end of the first air guide pipeline is communicated with the air inlet groove; an air outlet groove is formed in the inner surface, opposite to the third pressurizing surface, of the shell, and one end of the second air guide pipeline is communicated with the air outlet groove.
The core holder for permeability detection comprises a first air guide pipeline and a second air guide pipeline, wherein the first air guide pipeline comprises a first section and a second section, the first section extends along the transverse direction, the second section forms a preset angle with the first section, one end of the first section is communicated with the air inlet groove, and one end, far away from the first section, of the second section penetrates through the side face of the third pressurizing piece.
The core holder for permeability detection is characterized in that the third pressurizing surface is further provided with a first sealing ring, and the air inlet groove is positioned in the first sealing ring; the inner surface is further provided with a second sealing ring, and the air outlet groove is located in the second sealing ring.
The core holder for permeability detection is characterized in that the air inlet groove is formed by sequentially sleeving a plurality of first annular grooves, and the first annular grooves are communicated with one another.
The core holder for permeability detection is characterized in that the gas outlet groove is formed by sequentially sleeving a plurality of second annular grooves, and the second annular grooves are communicated with each other.
The core holder for permeability testing as described above, wherein the housing comprises: the device comprises a cylindrical body extending along the transverse direction, and a first cover body and a second cover body which are respectively covered at two ends of the cylindrical body; a first pressurizing hole and a second pressurizing hole are formed in the cylindrical body, the first pressurizing piece and the second pressurizing piece are respectively positioned in the first pressurizing hole and the second pressurizing hole, a third pressurizing hole is formed in the first cover body, and the third pressurizing piece is positioned in the third pressurizing hole; the second air duct is arranged on the second cover body; one end of the cylindrical body, which is close to the second cover body, is provided with a limiting part for abutting against the core, and the limiting part is also provided with a second sealing ring.
The core holder for permeability detection as described above, wherein the sealing means comprises: the third sealing ring is arranged between the first pressurizing rod and the shell; the fourth sealing ring is arranged between the second pressurizing rod and the shell; the fifth sealing ring is arranged between the third pressurizing part and the shell; the surface of the first pressurizing plate, which is far away from the first pressurizing rod, forms a first pressurizing surface, the surface of the second pressurizing plate, which is far away from the second pressurizing rod, forms a second pressurizing surface, and buffering pads are further arranged on the first pressurizing surface and the second pressurizing surface.
The core holder for permeability detection provided by the invention is provided with the shell, the pressurizing device, the air guide device and the sealing device; a cuboid accommodating cavity for accommodating the rock core is formed in the shell; the pressurizing device is arranged on the shell and comprises a first pressurizing piece, a second pressurizing piece and a third pressurizing piece which respectively extend along the vertical direction, the longitudinal direction and the transverse direction of the accommodating cavity; the first pressure piece, the second pressure piece and the third pressure piece can respectively apply vertical force, longitudinal force and transverse force to the core; the air guide device is communicated with the accommodating cavity and is used for conducting air pressure; the sealing device is arranged between the pressurizing device and the shell and used for sealing the accommodating cavity. During testing, the first pressurizing piece, the second pressurizing piece and the third pressurizing piece can respectively apply normal stress to the rock core in the vertical direction, the longitudinal direction and the transverse direction, so that the rock core is in a true triaxial stress condition, the stress conditions of different stratums can be simulated by adjusting the stress magnitude, and the permeability of the same rock core in different directions can be measured by changing the placing direction of the rock core, so that the rock core is saved.
Drawings
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description set forth herein is merely illustrative and explanatory of the present invention and is not restrictive of the invention as claimed below.
FIG. 1 is a first schematic cross-sectional view of a core holder for permeability testing according to the present disclosure;
FIG. 2 is a schematic diagram of a second cross-sectional structure of the core holder for permeability detection according to the present invention;
FIG. 3 is a schematic view of a third pressing member according to the present invention;
fig. 4 is a schematic structural diagram of the gas outlet groove of the present invention.
Description of reference numerals:
x: transverse direction;
y: longitudinal direction;
z: vertical direction;
1: a housing;
11: a cylindrical body;
12: a first cover body;
13: a second cover body;
131: a limiting part;
21: a first pressing member;
211: a first pressurizing rod;
212: a first pressing plate;
22: a second pressing member;
221: a second pressurizing rod;
222: a second pressing plate;
23: a third pressing member;
231: a third pressing surface;
31: a first air guide pipeline;
312: an air inlet groove;
313: a first annular groove;
32: a second air guide pipeline;
322: an air outlet groove;
41: a first seal ring;
42: a second seal ring;
43: a first seal member;
44: a second seal member;
45: a third seal ring;
46: a fourth seal ring;
47: a fifth seal ring;
5: a cushion pad;
6: and (4) a rock core.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description set forth herein is merely illustrative and explanatory of the present invention and is not restrictive of the invention as claimed below.
FIG. 1 is a first schematic cross-sectional view of a core holder for permeability testing according to the present disclosure; FIG. 2 is a schematic diagram of a second cross-sectional structure of the core holder for permeability detection according to the present invention; FIG. 3 is a schematic view of a third pressing member according to the present invention; fig. 4 is a schematic structural diagram of the gas outlet groove of the present invention. In the figure, x represents the transverse direction, y represents the longitudinal direction, and z represents the vertical direction.
Referring to fig. 1 to 4, the present embodiment provides a core holder for permeability detection, including: the device comprises a shell 1, a pressurizing device, an air guide device and a sealing device; an accommodating cavity for accommodating the rock core 6 is formed in the shell 1, and the accommodating cavity is in a cube shape; the pressurizing device is arranged on the shell 1 and comprises a first pressurizing part 21, a second pressurizing part 22 and a third pressurizing part 23 which respectively extend along the vertical direction z, the longitudinal direction y and the transverse direction x of the accommodating cavity; one end of the first pressure piece 21 extends into the accommodating cavity to apply a vertical force to the core 6; one end of the second pressure piece 22 extends into the containing cavity to apply a longitudinal force to the core 6; one end of the third pressure member 23 extends into the accommodation chamber to apply a lateral force to the core 6; the air guide device is communicated with the accommodating cavity and is used for conducting air pressure; a sealing means is provided between the pressurizing means and the housing 1 for sealing the accommodating chamber.
In particular, the core 6 is subjected to stresses in the formation in three main stress directions perpendicular to each other, which are referred to as "true triaxial"; whereas the prior art provides a core holder that provides confining pressure and axial force only to the core 6, this stress condition is known as "pseudo-triaxial". The pseudo-triaxial test cannot accurately simulate the stress condition of the rock core 6 in the stratum. The core holder provided by the embodiment can provide true triaxial stress conditions for the core 6, so that the accuracy of permeability detection of the core 6 is improved, and the core holder can comprise a shell 1 for placing the core 6, a pressurizing device for simulating the stress conditions of the core 6 in the stratum, and an air guide device for testing permeability. In addition, in order to ensure the accuracy of the permeability test result, a sealing device needs to be arranged between the pressurizing device and the casing 1 to ensure the air tightness of the device.
The shape of the housing 1 can be varied, for example the housing 1 can be formed in one piece, or it can be formed by interconnecting a plurality of parts. A receiving chamber for receiving the core 6 may be formed in the housing 1. To facilitate modeling of stress conditions of the core 6 in the formation, the containment cavity may be configured as a cube. The material of the housing 1 may be various, for example, it may be made of metal material through casting or welding, or it may be made of plastic material through injection molding, which is not limited herein. In addition, the core 6 may be shaped as a cube to fit the shape of the receiving cavity in order to facilitate the application of pressure. Preferably, the core 6 may be a 3cm square cube, and the shape of the receiving cavity may conform to the shape of the core 6.
The pressurizing device is arranged on the shell 1 and can comprise a first pressurizing member 21, a second pressurizing member 22 and a third pressurizing member 23 which respectively extend along the vertical direction z, the longitudinal direction y and the transverse direction x of the accommodating cavity; the first pressure piece 21, the second pressure piece 22 and the third pressure piece 23 can respectively apply vertical force, longitudinal force and transverse force to the core 6, so that true triaxial stress conditions are formed, and the stress conditions in the bottom layer are accurately simulated. The first pressure-applying member 21 may extend in a vertical direction z and may be of a cylindrical configuration, one end of which is capable of extending into the receiving chamber so as to contact the core 6 and apply a vertical force. The second pressure member 22 may extend in the longitudinal direction y, or it may be a cylindrical structure, one end of which is capable of extending into the receiving cavity so as to contact the core 6 and exert a longitudinal force. The third pressure-exerting member 23 may be elongated in the transverse direction x, or it may be of a cylindrical configuration, one end of which is capable of extending into the housing cavity so as to come into contact with the core 6 and exert a transverse force. The shapes and structures of the first pressing member 21, the second pressing member 22, and the third pressing member 23 may be the same or different, and are not particularly limited. In addition, the ends of the first pressing member 21, the second pressing member 22 and the third pressing member 23 facing away from the core 6 may be connected with a driving device capable of applying pressure, such as a hydraulic cylinder, an air cylinder, and the like, and are not limited in detail. It will be understood that the vertical z, longitudinal y, and transverse x directions are based on the orientation of the figures and are not intended to be specific.
The air guide device is communicated with the accommodating cavity and is used for conducting air pressure; the input end of the gas guide device can be connected with a gas source, the output end of the gas guide device can be connected with detection equipment, and the permeability of the rock core 6 can be calculated by calculating the attenuation curve of the air pressure of the upstream and downstream of the rock core 6 along with time. The structure of the gas guide may be varied, for example, the input end may be provided on the casing 1 and the output end may be provided on the pressurizing means, or the input end may be provided on the pressurizing means and the output means may be provided on the casing 1. The gas guide may also include a line or a gas guide hole in contact with two opposite sides of the core 6, which is not particularly limited herein.
The sealing device can be a rubber sealing gasket, a sealing ring and the like, and can be arranged at the contact part of the pressurizing device and the shell 1 to prevent gas from escaping from the shell 1, so that the accuracy of a permeability test result is influenced.
During detection, the core 6 cut into a square shape is placed in the accommodating cavity of the shell 1, the bedding direction needing to be detected in permeability is opposite to the gas guide device, then the first pressurizing piece 21, the second pressurizing piece 22 and the third pressurizing piece 23 are used for enabling the core 6 to be in contact with the core, vertical force, longitudinal force and transverse force are applied to the core 6, then the gas guide device is driven to input gas to the core 6, gas parameters penetrating through the core 6 are detected, and the permeability is calculated according to the input gas parameters. The permeability of the core 6 in one direction, for example, the permeability in the transverse direction x, can be obtained through one detection, and when the permeability in the longitudinal direction y and the permeability in the vertical direction z need to be detected, the core 6 can be rotated by 90 degrees to continue the detection, that is, one core 6 can simultaneously detect the permeability in three directions. In the prior art, the core is cut into a cylindrical shape, the permeability in the axial direction can only be detected by one-time detection, if the permeability in multiple directions of a reservoir is to be measured, multiple cores need to be prepared, and because the preparation of the cores is very difficult, particularly shale, the success rate is extremely low, the production efficiency is low, and multiple cores can cause resource waste. The core holder for permeability detection provided by the embodiment uses the cube core, the preparation method is simple, the success rate is high, the permeability in multiple directions can be measured only by using one core, and the core resources can be greatly saved.
The core holder for permeability detection provided by the embodiment is provided with a shell, a pressurizing device, an air guide device and a sealing device; a square accommodating cavity for accommodating the rock core is formed in the shell; the pressurizing device is arranged on the shell and comprises a first pressurizing piece, a second pressurizing piece and a third pressurizing piece which respectively extend along the vertical direction, the longitudinal direction and the transverse direction of the accommodating cavity; the first pressure piece, the second pressure piece and the third pressure piece can respectively apply vertical force, longitudinal force and transverse force to the core; the gas guide device is communicated with the accommodating cavity and used for inputting gas to the core and collecting the gas passing through the core; the sealing device is arranged between the pressurizing device and the shell and used for sealing the accommodating cavity. During testing, the first pressurizing piece, the second pressurizing piece and the third pressurizing piece can respectively apply normal stress to the rock core in the vertical direction, the longitudinal direction and the transverse direction, so that the rock core is in a true triaxial stress condition, meanwhile, the stress conditions of different stratums can be simulated by adjusting the stress magnitude, and the permeability of the same rock core in different directions can be measured by changing the placing direction of the rock core, so that the rock core is saved.
Further, as a preferred embodiment of the pressurizing means, the first pressurizing member 21 includes: a first pressure bar 211 extending in the vertical direction z, and a first pressure plate 212 fixed to one end of the first pressure bar 211, the first pressure plate 212 being located in the housing chamber and adapted to contact the core 6, the second pressure member 22 comprising: a second pressure bar 221 extending in the longitudinal direction y, and a second pressure plate 222 fixed to one end of the second pressure bar 221, the second pressure plate 222 being located in the housing chamber for contacting the core 6.
Specifically, the first pressure member 21 may include a first pressure rod 211 and a first pressure plate 212, the first pressure plate 212 may be cylindrical, one end of the first pressure plate 212 may extend into the accommodating cavity, and the first pressure plate 212 may be rectangular or square to match with the shape of the top surface of the core 6 in the vertical z direction, so as to ensure that the core 6 is evenly stressed. The second pressing member 22 may include a second pressing rod 221 and a second pressing plate 222, the second pressing rod 221 may be cylindrical, one end of the second pressing rod 221 may extend into the accommodating cavity, and the second pressing plate 222 may be rectangular or square in shape matching with the top surface of the core 6 in the longitudinal direction y, so as to ensure that the core 6 is uniformly stressed.
Further, an end surface of the third pressing member 23 facing the accommodation chamber is formed with a third pressing surface 231 for contacting the core 6; the air guide device includes: a first air guide pipeline 31 and a second air guide pipeline 32, wherein the first air guide pipeline 31 penetrates through the third pressurizing member 23 and penetrates through the third pressurizing surface 231, and is used for inputting gas into the accommodating cavity; a second gas conduit 32 is provided through the housing 1 and penetrates the inner surface of the housing 1 opposite the third pressing surface 231 for collecting gas passing through the core 6.
Specifically, the third pressing member 23 may be a cylindrical integrally formed member, and may include a cylindrical connecting portion penetrating the housing 1 and a square contact portion disposed at one end of the connecting portion located in the accommodating chamber, and the third pressing surface 231 is disposed on the contact portion.
The gas guide device may include a first gas guide pipeline 31 for inputting gas and a second gas guide pipeline 32 for collecting gas, the first gas guide pipeline 31 may be disposed on the third pressurizing member 23, and the structure of the gas guide device may be various, for example, a plurality of first gas guide holes arranged in parallel may be disposed on the third pressurizing member 23, the first gas guide holes may penetrate through the third pressurizing member 23, one end of each first gas guide hole may be connected to a gas source, and the other end of each first gas guide hole may be connected to the third pressurizing surface 231, so that gas flowing in the transverse direction x may be transmitted to the core 6, and the permeability of the core 6 in the transverse direction x may be tested. The inner surface of the casing 1 opposite to the third pressurizing surface 231 may be provided with a second air guide pipeline 32, the second air guide pipeline 32 may also include a plurality of second air guide holes which are arranged in parallel and penetrate through the casing 1, one end of each second air guide hole is connected with the inner surface, and the other end of each second air guide hole is connected with the detection device, so that the structure of the core holder for permeability detection in the embodiment is simplified. That is, the third pressing surface 231 and the inner surface are in contact with the respective surfaces of the core 6 opposite to each other in the transverse direction x. It will be appreciated that the first gas conduit 31 may also be used for collecting gas and the second gas conduit 32 for feeding gas. The first air-guide line 31 may also be provided on the first pressure member 21 or the second pressure member 22, and the second air-guide line 32 may be provided on a portion of the housing 1 opposite the first pressure member 21 or the second pressure member 22.
As another preferred embodiment of the air guide, an air inlet groove 312 is formed on the third pressurizing surface 231, and one end of the first air guide line 31 is communicated with the air inlet groove 312; an air outlet groove 322 is formed in an inner surface of the housing 1 opposite to the third pressurizing surface 231, and one end of the second air guide pipe 32 communicates with the air outlet groove 322.
Specifically, the first air guide pipeline 31 may be a passage penetrating through the third pressing member 23, which may be a linear or curved passage, and is not particularly limited herein, and may be formed by drilling or the like. Preferably, the first air guide line 31 may include a first section extending in the transverse direction x and a second section having a predetermined angle with respect to the first section, one end of the first section may communicate with the air inlet groove 312, and one end of the second section, which is far from the first section, may penetrate through a side surface of the third presser 23, thereby facilitating air supply. The third pressing member 23 extends in the transverse direction x, and the side surface may be a surface excluding both end surfaces thereof in the transverse direction x. When the third pressure member 23 comprises a cylindrical body extending axially in the transverse direction x, the outer surface of the cylindrical body around its axial direction is a side surface. Further, the predetermined angle may be 90 degrees.
The air inlet groove 312 may be a groove formed on the third pressing surface 231, and may have various shapes, such as a square shape or a circular shape, and preferably, the air inlet groove 312 is formed by sequentially sleeving a plurality of first annular grooves 313, and the plurality of first annular grooves 313 are communicated with each other. The first annular grooves 313 may be square annular grooves, and the size of the plurality of first annular grooves 313 is gradually reduced from the edge of the third pressing surface 231 toward the center, thereby forming an arrangement nested with each other. In addition, the plurality of first annular grooves 313 may be communicated with each other, and the first air guide pipeline 31 may be connected to the center of the air inlet groove 312, so that the air may be uniformly distributed on the third pressurizing surface 231 through the plurality of annular grooves 313, which is beneficial to improving the accuracy of the detection result.
The second air guide line 32 can also be a channel extending in the transverse direction x provided on the housing 1. The air outlet groove 322 may be disposed on the inner surface of the housing 1 opposite to the third pressing surface 231, and the shape and structure of the air outlet groove 322 are the same as those of the air inlet groove 312, that is, the air outlet groove 322 is formed by sequentially sleeving a plurality of second annular grooves, and the plurality of second annular grooves are communicated with each other, which may be referred to as the air inlet groove 312, and is not described again.
Furthermore, in order to enhance the air tightness, the third pressurizing surface 231 is further provided with a first sealing ring 41, and the air inlet groove 312 is positioned in the first sealing ring 41; the inner surface of the shell 1 is also provided with a second sealing ring 42, and the air outlet groove 322 is positioned in the second sealing ring 42. The first seal ring 41 and the second seal ring 42 may be square ring-shaped seal rings, and the number thereof may be plural, and is not particularly limited herein.
As a preferred embodiment of the housing 1, the housing 1 includes: a cylindrical body 11 extending in a transverse direction x, and a first cover 12 and a second cover 13 respectively covering both ends of the cylindrical body 11; a first pressurizing hole and a second pressurizing hole are formed in the cylindrical body 11, the first pressurizing piece 21 and the second pressurizing piece 22 are respectively positioned in the first pressurizing hole and the second pressurizing hole, a third pressurizing hole is formed in the first cover body 12, and the third pressurizing piece 23 is positioned in the third pressurizing hole; the second air guide pipeline 32 is arranged on the second cover body 13; one end of the cylindrical body 11 close to the second cover 13 is provided with a limiting part 131 for abutting against the core 6, and the limiting part 131 is further provided with a second sealing ring 42.
Specifically, the cylindrical body 11, the first cover 12 and the second cover 13 may enclose a containing cavity, the first pressing member 21 and the second pressing member 22 are provided on the cylindrical body 11, and the third pressing member 23 is provided on the first cover 12; the second air guide pipeline 32 is arranged on the second cover body 13, so that the core 6 can be conveniently prevented. One end of the cylindrical body 11 close to the second cover 13 is formed with a radially inward protruding limiting part 131, the second cover 13 may be a stepped structure, and the smaller end thereof may be matched with the limiting part 131, so as to form a longitudinal plane capable of contacting with the core 6. The air outlet groove 322 may be disposed on the second cover 13, and the second sealing ring 42 is disposed on the limiting portion 131.
Further, in order to improve the sealing effect, a first seal 43 is provided between the cylindrical main body 11 and the first lid 12, and a second seal 44 is provided between the cylindrical main body 11 and the second lid 13, thereby enhancing the sealing performance. The first seal 43 and the second seal 44 may be annular seal rings, and the number thereof may be plural, and is not particularly limited herein.
On the basis of the above embodiment, the sealing device includes: a third seal ring 45, a fourth seal ring 46, and a fifth seal ring 47, the third seal ring 45 being provided between the first pressurizing rod 211 and the housing 1; the fourth seal ring 46 is provided between the second pressurizing rod 221 and the housing 1; the fifth seal ring 47 is provided between the third pressurizing member 23 and the housing 1, thereby enhancing the sealing performance. The third seal ring 45, the fourth seal ring 46 and the fifth seal ring 47 may be ring-shaped seal rings, and the number thereof may be plural, and is not particularly limited herein.
In addition to the above embodiment, the surface of the first pressing plate 212 facing away from the first pressing bar 211 forms a first pressing surface, the surface of the second pressing plate 222 facing away from the second pressing bar 221 forms a second pressing surface, and the first and second pressing surfaces are further provided with the cushion 5. The first and second pressing surfaces can contact the core 6 through the cushion pad 5, thereby improving the uniformity of stress on the core 6.
In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation; unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are intended to be inclusive and mean that, for example, the term "connected" may be fixed or removable or integrally connected. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A core holder for permeability testing, comprising: the device comprises a shell, a pressurizing device, an air guide device and a sealing device;
an accommodating cavity for accommodating the rock core is formed in the shell, and the accommodating cavity is square;
the pressurizing device is arranged on the shell and comprises a first pressurizing part, a second pressurizing part and a third pressurizing part which respectively extend along the vertical direction, the longitudinal direction and the transverse direction of the accommodating cavity; one end of the first pressurizing piece extends into the accommodating cavity so as to apply vertical force to the core; one end of the second pressure piece extends into the containing cavity to apply longitudinal force to the core; one end of the third pressurizing piece extends into the containing cavity to apply transverse force to the core;
the air guide device is communicated with the accommodating cavity and is used for conducting air pressure;
the sealing device is arranged between the pressurizing device and the shell and used for sealing the accommodating cavity;
the first pressing member includes: the first pressure plate is positioned in the accommodating cavity and is used for being in contact with the core; the second pressing member includes: the second pressure rod extends along the longitudinal direction, and a second pressure plate is fixed at one end of the second pressure rod, and the second pressure plate is positioned in the accommodating cavity and is used for being in contact with the core;
a third pressurizing surface used for being in contact with the core is formed on the end face, facing the containing cavity, of the third pressurizing piece;
the air guide device comprises: the first air guide pipe penetrates through the third pressurizing part and penetrates through the third pressurizing surface, and is used for inputting air into the accommodating cavity; the second gas guide pipe penetrates through the shell and penetrates through the inner surface of the shell opposite to the third pressurizing surface, and is used for collecting gas penetrating through the rock core;
an air inlet groove is formed in the third pressurizing surface, and one end of the first air guide pipeline is communicated with the air inlet groove;
an air outlet groove is formed in the inner surface of the shell opposite to the third pressurizing surface, and one end of the second air guide pipeline is communicated with the air outlet groove;
the third pressurizing surface is also provided with a first sealing ring, and the air inlet groove is positioned in the first sealing ring; the inner surface is also provided with a second sealing ring, and the air outlet groove is positioned in the second sealing ring;
the housing includes: the device comprises a cylindrical body extending along the transverse direction, and a first cover body and a second cover body which are respectively covered at two ends of the cylindrical body; a first pressurizing hole and a second pressurizing hole are formed in the cylindrical body, the first pressurizing piece and the second pressurizing piece are respectively positioned in the first pressurizing hole and the second pressurizing hole, a third pressurizing hole is formed in the first cover body, and the third pressurizing piece is positioned in the third pressurizing hole; the second air duct is arranged on the second cover body; one end of the cylindrical body, which is close to the second cover body, is provided with a limiting part which protrudes inwards in the radial direction, the limiting part is used for abutting against the rock core, and the second sealing ring is arranged on the limiting part.
2. The core holder for permeability detection as claimed in claim 1, wherein the first air duct comprises a first section extending in a transverse direction and a second section forming a predetermined angle with the first section, one end of the first section is communicated with the air inlet groove, and one end of the second section, which is far away from the first section, penetrates through a side surface of the third pressurizing member.
3. The core holder for permeability detection as claimed in claim 2, wherein the air inlet channel is formed by sequentially sleeving a plurality of first annular grooves, and the plurality of first annular grooves are communicated with each other.
4. The core holder for permeability detection as claimed in claim 3, wherein the air outlet groove is formed by sequentially sleeving a plurality of second annular grooves, and the plurality of second annular grooves are communicated with each other.
5. The core holder for permeability testing as claimed in any of claims 1-4, wherein the sealing means comprises: the third sealing ring is arranged between the first pressurizing rod and the shell; the fourth sealing ring is arranged between the second pressurizing rod and the shell; the fifth sealing ring is arranged between the third pressurizing part and the shell; the surface of the first pressurizing plate, which is far away from the first pressurizing rod, forms a first pressurizing surface, the surface of the second pressurizing plate, which is far away from the second pressurizing rod, forms a second pressurizing surface, and buffering pads are further arranged on the first pressurizing surface and the second pressurizing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119660.XA CN108489879B (en) | 2018-02-06 | 2018-02-06 | Core holder for permeability detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119660.XA CN108489879B (en) | 2018-02-06 | 2018-02-06 | Core holder for permeability detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108489879A CN108489879A (en) | 2018-09-04 |
| CN108489879B true CN108489879B (en) | 2020-04-10 |
Family
ID=63344605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810119660.XA Active CN108489879B (en) | 2018-02-06 | 2018-02-06 | Core holder for permeability detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108489879B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270246A (en) * | 2018-10-19 | 2019-01-25 | 成都理工大学 | A kind of radial more monitoring core holding units for fracture hole oil reservoir |
| CN109470621B (en) * | 2018-12-13 | 2021-01-26 | 重庆科技学院 | Measuring device for rock stratum permeability |
| CN113848163A (en) * | 2021-09-26 | 2021-12-28 | 中国石油大学(华东) | Core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress |
| CN114112846B (en) * | 2021-11-19 | 2023-09-19 | 西安石油大学 | Rock permeability measuring device for geology |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1595098A (en) * | 2004-06-24 | 2005-03-16 | 石油大学(北京) | Rock core gripper for simulating formation multiple stress field coupling action |
| CN201340381Y (en) * | 2008-12-15 | 2009-11-04 | 南通市飞宇石油科技开发有限公司 | Three-axialdirection core holder |
| JP5442546B2 (en) * | 2010-07-06 | 2014-03-12 | 一般財団法人電力中央研究所 | Rock sample permeability test method |
| CN103592186A (en) * | 2013-11-29 | 2014-02-19 | 重庆大学 | Device and experimental method for researching shale hydraulic-fracturing damage evolution under true triaxial loading condition |
| CN204188492U (en) * | 2014-10-17 | 2015-03-04 | 中国石油大学(北京) | Rock true triaxial permeability clamper |
| CN204439498U (en) * | 2014-12-29 | 2015-07-01 | 四川光亚聚合物化工有限公司 | One side's core holding unit and square diversion trench thereof |
| CN104655495B (en) * | 2015-02-13 | 2017-05-10 | 太原理工大学 | High temperature and high pressure coal and rock true triaxial fracturing and seepage test device and test method |
| CN106896043B (en) * | 2015-12-21 | 2019-11-08 | 中国石油天然气股份有限公司 | True triaxial stress Imitating crack initiation and the device for evaluating fisstured flow |
| CN105547849B (en) * | 2016-03-01 | 2018-12-04 | 安徽理工大学 | Large scale stratiform pressure-bearing rock true triaxial adds unloading test device and test method |
| CN205562279U (en) * | 2016-03-31 | 2016-09-07 | 河南理工大学 | Square rock core clamping device |
| CN205879690U (en) * | 2016-07-18 | 2017-01-11 | 西南石油大学 | Be used for shale anisotropic testing arrangement under true triaxial condition |
| CN106761721B (en) * | 2016-11-28 | 2021-04-13 | 中国石油大学(华东) | Experimental device and experimental method for improving thermal reservoir in consideration of thermal stress fracturing natural fracture development for enhanced geothermal system |
-
2018
- 2018-02-06 CN CN201810119660.XA patent/CN108489879B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108489879A (en) | 2018-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108489879B (en) | Core holder for permeability detection | |
| CN106226216B (en) | A kind of core holding unit and its measurement method | |
| CN209875145U (en) | Oil gas well cement sheath sealing integrity testing arrangement | |
| CN107782628A (en) | Single fissure rock test specimen staight scissors seepage flow test device and test method under a kind of hydrostatic conditions | |
| US2842958A (en) | Apparatus for measuring flow characteristics of porous specimens by displacement | |
| CN111579464A (en) | Seepage anisotropy test device and method suitable for triaxial testing machine | |
| CN106353197B (en) | High-pressure multiphase flow coupling rock true triaxial test system and method thereof | |
| CN106323841A (en) | Device for measuring permeability of ultra-low permeability rocks under action of triaxial stress | |
| CN201273190Y (en) | Triaxial-stress multi-pressure test point rock core reservoir simulation device | |
| CN203672759U (en) | Osmosis device for crushed rock triaxial seepage test | |
| CN112816389B (en) | Multidirectional multilayer full-diameter fracture core seepage simulation device and application thereof | |
| CN210322723U (en) | Long rock core gas injection displacement experimental apparatus | |
| CN103528932A (en) | Multifunctional radial holder | |
| CN109211753A (en) | More of rock, multiphase porous flow experimental provision under a kind of perturbation action | |
| CN108956854B (en) | Device for evaluating plugging performance of temporary plugging steering fluid and testing method thereof | |
| CN106198346B (en) | A kind of core holding unit and measurement method that can measure mechanics parameter and permeability | |
| CN211505126U (en) | Device for monitoring permeability dynamic change of rock core hydration process | |
| CN110530772B (en) | Integrative test device of coal sample high pressure meeting an emergency and carbon dioxide displacement coal bed methane | |
| CN110529107B (en) | Comprehensive testing device and method for coal seam strain, seepage, displacement and jet flow | |
| CN109738302B (en) | Testing device and method for rock direct shear-seepage | |
| CN211740921U (en) | Deep high-temperature and high-pressure environment rock stretching and tension-compression circulating mechanical experiment device | |
| CN206862582U (en) | Filter core automatic testing equipment | |
| CN106324214A (en) | Major-diameter core capillary pressure curve and bound water saturation measuring apparatus | |
| CN111307606A (en) | Deep high-temperature and high-pressure environment rock stretching and tension-compression circulating mechanical experiment device | |
| CN110778355A (en) | In-situ drainage and mining test device and method for coal bed gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |