CN111337406A - Core holder for leak-free pulse permeability test - Google Patents
Core holder for leak-free pulse permeability test Download PDFInfo
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- CN111337406A CN111337406A CN202010200815.XA CN202010200815A CN111337406A CN 111337406 A CN111337406 A CN 111337406A CN 202010200815 A CN202010200815 A CN 202010200815A CN 111337406 A CN111337406 A CN 111337406A
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- 238000012360 testing method Methods 0.000 title claims abstract description 12
- 230000035699 permeability Effects 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 31
- 239000007924 injection Substances 0.000 claims abstract description 31
- 238000005192 partition Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to a core holder for a leakage-free pulse permeability test, which is characterized in that: the device comprises a clamping cylinder, an upper gas injection module, an upper connecting module, a lower connecting module and a lower gas injection module; according to the invention, the core is clamped by the clamping rubber sleeve in the clamping cylinder body, and plugging is carried out by the upper core plug and the lower core plug; the upper gas injection module is internally provided with a gas source, gas leakage is avoided by matching the single valve body, the two-position three-way valve cover, the two-position three-way valve body, the upper sliding body and the first upper sealing cone in the upper gas injection module, meanwhile, the lower valve body, the lower sliding body and the lower sealing cone of the lower gas injection module are matched with the upper gas injection module through pipelines, air pressure balance is realized, and leakage risks existing in flange connection are avoided.
Description
Technical Field
The invention relates to the field of core holders, in particular to a leakage-free pulse permeability test core holder.
Background
In order to simulate the continuous change condition of physical property parameters of a reservoir under the compaction action in the actual stratum buried diagenesis process, a sandstone mechanical compaction action simulation experiment is a main way by utilizing different modern sediment samples, wherein a rock core holder is an essential component in the experiment process; most of the existing rock core holders comprise a shell, a rubber cylinder, a left rock core top head, a right rock core top head, a left fixing sleeve, a right fixing sleeve, a left fastening sleeve, a right fastening sleeve and a fixing support. In the conventional core holder, a flange type connecting structure is adopted between the air inlet structure and the core holder, and the connecting structure easily causes the air leakage condition, so that a novel core holder is needed to solve the air leakage condition of the conventional flange connecting structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a leakage-free pulse permeability test core holder, which can solve the problem that the conventional core holder adopts a flange connection structure to feed air and is easy to leak.
In order to solve the technical problems, the technical scheme of the invention is as follows: a leak-free pulse permeability test core holder is characterized in that: the device comprises a clamping cylinder, an upper gas injection module, an upper connecting module, a lower connecting module and a lower gas injection module;
the clamping cylinder body is of a cylindrical structure, and a confining pressure monitoring hole is formed in the clamping cylinder body; the inner wall of one end of the clamping cylinder body is of a straight cylinder type structure, the outer wall of the end part is provided with a connecting thread, and the inner wall of the other end of the clamping cylinder body is provided with a reducing conical surface structure; a clamping rubber sleeve is coaxially arranged in the clamping cylinder body, and a gap is reserved between the clamping rubber sleeve and the inner wall of the clamping cylinder body; the two ends of the clamping rubber sleeve are opened and are in an expanded diameter ladder structure;
the upper gas injection module comprises an upper gas pressure standard tank, a single valve body, a two-position three-way valve cover and a two-position three-way valve body; the upper air pressure standard tank, the single valve body, the two-position three-way valve cover and the two-position three-way valve body are sequentially arranged from top to bottom, and the bottom end of the two-position three-way valve body is connected to the upper connecting module; the upper air pressure standard tank is provided with an air source interface and an upper air outlet; an upper air outlet of the upper air pressure standard tank is connected to the single valve body; the single valve body comprises a single valve body shell, an upper piston A, an upper piston B, an upper sliding body and a first upper sealing cone; the single valve body shell is connected to an upper air outlet of the upper air pressure standard tank, and the upper piston A and the upper piston B are coaxially arranged and are arranged in the single valve body shell; the upper sliding body is arranged in the upper piston A, and a cavity for accommodating a first upper sealing cone is formed in the inner part of the upper sliding body along the axial direction; the first upper sealing cone is embedded in the upper sliding block, a through hole for communicating an upper air outlet of the upper air pressure standard tank with the two-position three-way valve cover is formed in the first upper sealing cone, a top port of the two-position three-way valve cover is connected to the single valve body, a bottom port of the two-position three-way valve cover is connected to the two-position three-way valve body and communicated with the upper connecting module, and a side port of the two-position three-way valve cover is connected with an upper balance air port; an upper piston C and an upper piston D are arranged in the two-position three-way valve body;
the upper connecting module comprises an upper connecting cap, a first upper pressing cap, an upper connecting sleeve, a second upper pressing cap, an adjusting rod, an upper taper sleeve, a valve needle rod, a second upper sealing cone, a valve needle pressing cap and an upper core plug;
the upper connecting cap is of a cylindrical tubular structure, two ends of the upper connecting cap are opened, a partition plate is arranged in the middle of the upper connecting cap to divide the upper connecting cap into a lower chamber and an upper chamber, and a through hole penetrating through the upper chamber and the lower chamber is formed in the partition plate; the inner wall of the lower cavity is provided with internal threads and is in threaded connection with one end of the clamping cylinder body with connecting threads; the upper chamber is provided with a gas receiving port communicated with the inner cavity, and the inner wall of the end part of the upper chamber is provided with threads; the upper connecting sleeve is coaxially arranged in the upper cavity of the upper connecting cap, and a gap for accommodating the first upper pressing cap is formed between the outer wall of the upper connecting sleeve and the inner wall of the upper connecting cap; the outer wall of the first upper pressing cap is provided with threads, and the first upper pressing cap is in threaded fit with the upper cavity of the upper connecting cap to tightly press the upper connecting sleeve in the upper cavity; the inner wall of the upper connecting sleeve is provided with threads; the outer wall of the second upper pressing cap is provided with a thread structure matched with the outer wall of the upper connecting sleeve, and the second upper pressing cap is matched with the upper connecting sleeve through threads; the adjusting rod is of a hollow cylindrical structure, one end of the adjusting rod sequentially penetrates through the second upper pressing cap, the upper connecting sleeve and the upper connecting cap along the axis direction and extends to the end part of the clamping rubber sleeve in the clamping cylinder, and an upper taper sleeve is arranged between the outer wall of the end part of the adjusting rod and the inner wall of the clamping cylinder; the end part of the upper taper sleeve is embedded into the stepped structure port of the clamping rubber sleeve, and the inner wall of the upper taper sleeve is tightly attached to the outer wall of the adjusting rod; the outer wall of the other end of the adjusting rod is provided with adjusting threads, and the second upper pressing cap is limited and locked on the adjusting threads of the adjusting rod through a hoop with an adjusting thread structure, so that the second upper pressing cap is positioned;
the valve needle rod is coaxially arranged in the hollow adjusting rod, and a through air passage is formed in the valve needle rod along the axis direction; a concave hole for accommodating a second upper sealing cone is formed in the inner cavity at the bottom end of the valve needle rod, and the second upper sealing cone is arranged in the concave hole; the second upper sealing cone is provided with a plurality of through holes communicated with the air passage in the valve needle rod; a valve needle pressing cap is nested on the outer wall of the bottom end of the valve needle rod to realize the limit of the second upper sealing cone; the bottom end of the valve needle pressing cap is provided with a through hole for accommodating the end part of the upper core plug to be embedded; the top end of the upper core plug is embedded in the valve needle pressing cap, a flow channel coaxial with the valve needle rod air passage is formed in the upper core plug along the axis direction, the upper core plug is of a stepped shaft structure, one step section of the upper core plug is in threaded connection with the inner wall of the end part of the adjusting rod, and the other step section is attached to the inner wall of the clamping rubber sleeve;
the lower connecting module comprises a lower taper sleeve and a lower core plug; the lower taper sleeve is attached to the tapered surface structure of the inner wall of the bottom end of the clamping cylinder, the lower core plug penetrates through the lower taper sleeve, the top end of the lower core plug is arranged in the clamping rubber sleeve, the bottom end of the lower core plug is connected to the lower gas injection module, and a lower balance gas port is formed in the side edge of the lower core plug.
Further, the lower gas injection module comprises a lower gas pressure standard tank, a lower valve body, a lower sliding body and a lower sealing cone; the lower air pressure standard tank is provided with a lower air outlet which is connected to the lower valve body, a lower piston A and a lower piston B are arranged in the lower valve body, the lower sliding body is arranged in the lower piston A, and a cavity for accommodating the lower sealing cone is formed in the inner part of the lower sliding body along the axial direction; the lower sealing cone is embedded in the lower sliding block, and a through hole for communicating a lower air outlet of the lower air pressure standard tank with the lower core plug is formed in the lower sealing cone.
The invention has the advantages that:
1) according to the invention, the core is clamped by the clamping rubber sleeve in the clamping cylinder body, and plugging is carried out by the upper core plug and the lower core plug; the upper gas injection module is internally provided with a gas source, gas leakage is avoided by matching the single valve body, the two-position three-way valve cover, the two-position three-way valve body, the upper sliding body and the first upper sealing cone in the upper gas injection module, meanwhile, the lower valve body, the lower sliding body and the lower sealing cone of the lower gas injection module are matched with the upper gas injection module through pipelines, air pressure balance is realized, and leakage risks existing in flange connection are avoided.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a cross-sectional view of a leak-free pulse permeability test core holder of the present invention.
Fig. 2 is a test state diagram of a leak-free pulse permeability test core holder of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A leak-free pulse permeability test core holder as shown in fig. 1 and 2; the device comprises a clamping cylinder body 1, an upper gas injection module 2, an upper connecting module 3, a lower connecting module 4 and a lower gas injection module 5.
The clamping cylinder body 1 is of a cylindrical structure, and a confining pressure monitoring hole 11 is formed in the clamping cylinder body 1; the inner wall of one end of the clamping cylinder body 1 is of a straight cylinder type structure, the outer wall of the end part is provided with a connecting thread, and the inner wall of the other end of the clamping cylinder body 1 is provided with a reducing conical surface structure; a clamping rubber sleeve 12 is coaxially arranged in the clamping cylinder 1, and a gap is reserved between the clamping rubber sleeve 12 and the inner wall of the clamping cylinder 1; the two ends of the clamping rubber sleeve 12 are open and have a diameter-expanding ladder structure.
The upper gas injection module 2 comprises an upper gas pressure standard tank 21, a single valve body 22, a two-position three-way valve cover 23 and a two-position three-way valve body 24; the upper air pressure standard tank 21, the single valve body 22, the two-position three-way valve cover 23 and the two-position three-way valve body 24 are sequentially arranged from top to bottom, and the bottom end of the two-position three-way valve body 24 is connected to the upper connecting module 3; the upper air pressure standard tank 21 is provided with an air source interface 211 and an upper air outlet 212; the upper air outlet 212 of the upper air pressure standard tank 21 is connected to the single valve body 22; the single valve body 22 includes a single valve body housing 221, an upper piston a222, an upper piston B223, an upper slide 224, and a first upper sealing cone 225; the single valve body shell 221 is connected to the upper air outlet 212 of the upper air pressure standard tank 21, and the upper piston A222 and the upper piston B223 are coaxially arranged and are arranged in the single valve body shell 221; the upper sliding body 224 is arranged in the upper piston A222, and a cavity for accommodating the first upper sealing cone 225 is formed in the upper sliding body 224 along the axial direction; a first upper sealing cone 225 is embedded in the upper sliding body 224, a through hole for communicating an upper air outlet 212 of the upper air pressure standard tank with a two-position three-way valve cover 23 is formed in the first upper sealing cone 225, a top port of the two-position three-way valve cover 23 is connected to the single valve body, a bottom port of the two-position three-way valve cover 23 is connected to the two-position three-way valve body 24 and communicated with the upper connecting module 3, and a side port of the two-position three-way valve cover 23 is connected with an upper balance air port; an upper piston C241 and an upper piston D242 are arranged in the two-position three-way valve body 24.
The upper connecting module 3 comprises an upper connecting cap 31, a first upper pressing cap 32, an upper connecting sleeve 33, a second upper pressing cap 34, an adjusting rod 35, an upper taper sleeve 36, a valve needle rod 37, a second upper sealing cone 38, a valve needle pressing cap 39 and an upper core plug 30.
The upper connecting cap 31 is in a cylindrical structure, two ends of the upper connecting cap 31 are opened, a partition plate is arranged in the middle of the upper connecting cap 31 to divide the upper connecting cap into a lower chamber and an upper chamber, and a through hole penetrating through the upper chamber and the lower chamber is formed in the partition plate; the inner wall of the lower cavity is provided with internal threads and is connected with one end of the clamping cylinder body 1 with connecting threads through threads; the upper chamber is provided with an air connecting port communicated with the inner cavity, and the inner wall of the end part of the upper chamber is provided with threads; the upper connecting sleeve 33 is coaxially arranged in the upper cavity of the upper connecting cap 31, and a gap for accommodating the first upper pressing cap 32 is formed between the outer wall of the upper connecting sleeve 33 and the inner wall of the upper connecting cap 31; the outer wall of the first upper pressing cap 32 is provided with threads, and the upper connecting sleeve 33 is tightly pressed in an upper chamber by the threaded matching of the first upper pressing cap 32 and the upper chamber of the upper connecting cap 31; the inner wall of the upper connecting sleeve 33 is provided with threads; the outer wall of the second upper pressure cap 34 is provided with a thread structure matched with the outer wall of the upper connecting sleeve 33, and the second upper pressure cap 34 is matched with the upper connecting sleeve 33 through threads; the adjusting rod 35 is of a hollow cylindrical structure, one end of the adjusting rod 35 sequentially penetrates through the second upper pressing cap 34, the upper connecting sleeve 33 and the upper connecting cap 31 along the axis direction and extends to the end part of the clamping rubber sleeve 12 in the clamping cylinder 1, and an upper taper sleeve 36 is arranged between the outer wall of the end part of the adjusting rod 35 and the inner wall of the clamping cylinder 1; the end part of the upper taper sleeve 36 is embedded in the stepped structure port of the clamping rubber sleeve 12, and the inner wall is tightly attached to the outer wall of the adjusting rod 35; an adjusting thread is arranged on the outer wall of the other end of the adjusting rod 35, and the second upper pressing cap 34 is locked on the adjusting thread of the adjusting rod in a limiting mode through a hoop with an adjusting thread structure, so that the second upper pressing cap 24 is positioned.
The valve needle rod 37 is coaxially arranged in the hollow adjusting rod 36, and the valve needle rod 37 is provided with a through air passage along the axial direction; a concave hole for accommodating the second upper sealing cone 38 is formed in the inner cavity at the bottom end of the valve needle rod 37, and the second upper sealing cone 38 is arranged in the concave hole; the second upper sealing cone 38 is provided with a plurality of through holes communicated with the air channel in the valve needle rod 37; a valve needle pressing cap 39 is nested on the outer wall of the bottom end of the valve needle rod 37 to realize the limit of the second upper sealing cone 38; the bottom end of the valve needle pressing cap 39 is provided with a through hole for accommodating the end part of the upper core plug 30 to be embedded; the top end of the upper core plug 30 is embedded in the valve needle pressing cap 39, a flow channel coaxial with the air channel of the valve needle rod 37 is formed in the upper core plug 30 along the axis direction, the upper core plug 30 is of a stepped shaft structure, one step section of the upper core plug 30 is in threaded connection with the inner wall of the end part of the adjusting rod 36, and the other step section is attached to the inner wall of the clamping rubber sleeve 12.
The lower connection module 4 comprises a lower taper sleeve 41 and a lower core plug 42; the lower taper sleeve 41 is attached to the tapered surface structure of the inner wall of the bottom end of the clamping cylinder 1, the lower core plug 42 penetrates through the lower taper sleeve 41, the top end of the lower core plug 42 is arranged in the clamping rubber sleeve 12, the bottom end of the lower core plug 42 is connected to the lower gas injection module 5, and the side edge of the lower core plug 42 is provided with a lower balance gas port.
The lower gas injection module 5 comprises a lower gas pressure standard tank 51, a lower valve body 52, a lower slider 53 and a lower sealing cone 54; the lower air pressure standard tank 51 is provided with a lower air outlet which is connected to the lower valve body 52, a lower piston A521 and a lower piston B522 are arranged in the lower valve body 52, the lower piston 53 is arranged in the lower piston A521, and a cavity for accommodating the lower sealing cone 54 is formed in the lower piston 53 along the axial direction; the lower sealing cone 54 is embedded in the lower sliding body 53, and a through hole for communicating a lower air outlet of the lower air pressure standard tank 51 with the lower core plug 42 is formed in the lower sealing cone 54.
The working principle of the invention is as follows: the core is clamped by a clamping rubber sleeve in the clamping cylinder body, and plugging is performed by an upper core plug and a lower core plug; the upper gas injection module is internally provided with a gas source, and gas leakage is avoided through the matching of the single valve body, the two-position three-way valve cover, the two-position three-way valve body, the upper sliding body and the first upper sealing cone in the upper gas injection module; when gas in a gas source enters from the upper gas pressure standard tank, the gas enters the two-position three-way valve cover and the two-position three-way valve body through the single valve outlet and the first upper sealing cone, and finally enters the clamping rubber sleeve to displace the rock core, the first upper sealing cone can move along the inner wall of the upper sliding body to realize the balance of the upper and lower gas pressures of the inner first upper sealing cone, and no leakage is generated; meanwhile, the upper gas injection module can be communicated with the lower gas injection module through a pipeline, and a lower valve body, a lower sliding body and a lower sealing cone of the lower gas injection module are matched with the upper gas injection module, so that the air pressure balance at two ends of the clamping cylinder is realized, and the leakage risk existing in flange connection is avoided.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A leak-free pulse permeability test core holder is characterized in that: the device comprises a clamping cylinder, an upper gas injection module, an upper connecting module, a lower connecting module and a lower gas injection module;
the clamping cylinder body is of a cylindrical structure, and a confining pressure monitoring hole is formed in the clamping cylinder body; the inner wall of one end of the clamping cylinder body is of a straight cylinder type structure, the outer wall of the end part is provided with a connecting thread, and the inner wall of the other end of the clamping cylinder body is provided with a reducing conical surface structure; a clamping rubber sleeve is coaxially arranged in the clamping cylinder body, and a gap is reserved between the clamping rubber sleeve and the inner wall of the clamping cylinder body; the two ends of the clamping rubber sleeve are opened and are in an expanded diameter ladder structure;
the upper gas injection module comprises an upper gas pressure standard tank, a single valve body, a two-position three-way valve cover and a two-position three-way valve body; the upper air pressure standard tank, the single valve body, the two-position three-way valve cover and the two-position three-way valve body are sequentially arranged from top to bottom, and the bottom end of the two-position three-way valve body is connected to the upper connecting module; the upper air pressure standard tank is provided with an air source interface and an upper air outlet; an upper air outlet of the upper air pressure standard tank is connected to the single valve body; the single valve body comprises a single valve body shell, an upper piston A, an upper piston B, an upper sliding body and a first upper sealing cone; the single valve body shell is connected to an upper air outlet of the upper air pressure standard tank, and the upper piston A and the upper piston B are coaxially arranged and are arranged in the single valve body shell; the upper sliding body is arranged in the upper piston A, and a cavity for accommodating a first upper sealing cone is formed in the inner part of the upper sliding body along the axial direction; the first upper sealing cone is embedded in the upper sliding block, a through hole for communicating an upper air outlet of the upper air pressure standard tank with the two-position three-way valve cover is formed in the first upper sealing cone, a top port of the two-position three-way valve cover is connected to the single valve body, a bottom port of the two-position three-way valve cover is connected to the two-position three-way valve body and communicated with the upper connecting module, and a side port of the two-position three-way valve cover is connected with an upper balance air port; an upper piston C and an upper piston D are arranged in the two-position three-way valve body;
the upper connecting module comprises an upper connecting cap, a first upper pressing cap, an upper connecting sleeve, a second upper pressing cap, an adjusting rod, an upper taper sleeve, a valve needle rod, a second upper sealing cone, a valve needle pressing cap and an upper core plug;
the upper connecting cap is of a cylindrical tubular structure, two ends of the upper connecting cap are opened, a partition plate is arranged in the middle of the upper connecting cap to divide the upper connecting cap into a lower chamber and an upper chamber, and a through hole penetrating through the upper chamber and the lower chamber is formed in the partition plate; the inner wall of the lower cavity is provided with internal threads and is in threaded connection with one end of the clamping cylinder body with connecting threads; the upper chamber is provided with a gas receiving port communicated with the inner cavity, and the inner wall of the end part of the upper chamber is provided with threads; the upper connecting sleeve is coaxially arranged in the upper cavity of the upper connecting cap, and a gap for accommodating the first upper pressing cap is formed between the outer wall of the upper connecting sleeve and the inner wall of the upper connecting cap; the outer wall of the first upper pressing cap is provided with threads, and the first upper pressing cap is in threaded fit with the upper cavity of the upper connecting cap to tightly press the upper connecting sleeve in the upper cavity; the inner wall of the upper connecting sleeve is provided with threads; the outer wall of the second upper pressing cap is provided with a thread structure matched with the outer wall of the upper connecting sleeve, and the second upper pressing cap is matched with the upper connecting sleeve through threads; the adjusting rod is of a hollow cylindrical structure, one end of the adjusting rod sequentially penetrates through the second upper pressing cap, the upper connecting sleeve and the upper connecting cap along the axis direction and extends to the end part of the clamping rubber sleeve in the clamping cylinder, and an upper taper sleeve is arranged between the outer wall of the end part of the adjusting rod and the inner wall of the clamping cylinder; the end part of the upper taper sleeve is embedded into the stepped structure port of the clamping rubber sleeve, and the inner wall of the upper taper sleeve is tightly attached to the outer wall of the adjusting rod; the outer wall of the other end of the adjusting rod is provided with adjusting threads, and the second upper pressing cap is limited and locked on the adjusting threads of the adjusting rod through a hoop with an adjusting thread structure, so that the second upper pressing cap is positioned;
the valve needle rod is coaxially arranged in the hollow adjusting rod, and a through air passage is formed in the valve needle rod along the axis direction; a concave hole for accommodating a second upper sealing cone is formed in the inner cavity at the bottom end of the valve needle rod, and the second upper sealing cone is arranged in the concave hole; the second upper sealing cone is provided with a plurality of through holes communicated with the air passage in the valve needle rod; a valve needle pressing cap is nested on the outer wall of the bottom end of the valve needle rod to realize the limit of the second upper sealing cone; the bottom end of the valve needle pressing cap is provided with a through hole for accommodating the end part of the upper core plug to be embedded; the top end of the upper core plug is embedded in the valve needle pressing cap, a flow channel coaxial with the valve needle rod air passage is formed in the upper core plug along the axis direction, the upper core plug is of a stepped shaft structure, one step section of the upper core plug is in threaded connection with the inner wall of the end part of the adjusting rod, and the other step section is attached to the inner wall of the clamping rubber sleeve;
the lower connecting module comprises a lower taper sleeve and a lower core plug; the lower taper sleeve is attached to the tapered surface structure of the inner wall of the bottom end of the clamping cylinder, the lower core plug penetrates through the lower taper sleeve, the top end of the lower core plug is arranged in the clamping rubber sleeve, the bottom end of the lower core plug is connected to the lower gas injection module, and a lower balance gas port is formed in the side edge of the lower core plug.
2. The leak-free pulse permeability test core holder as recited in claim 1, wherein: the lower gas injection module comprises a lower gas pressure standard tank, a lower valve body, a lower sliding body and a lower sealing cone; the lower air pressure standard tank is provided with a lower air outlet which is connected to the lower valve body, a lower piston A and a lower piston B are arranged in the lower valve body, the lower sliding body is arranged in the lower piston A, and a cavity for accommodating the lower sealing cone is formed in the inner part of the lower sliding body along the axial direction; the lower sealing cone is embedded in the lower sliding block, and a through hole for communicating a lower air outlet of the lower air pressure standard tank with the lower core plug is formed in the lower sealing cone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200815.XA CN111337406B (en) | 2020-03-20 | 2020-03-20 | Core holder for leak-free pulse permeability test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010200815.XA CN111337406B (en) | 2020-03-20 | 2020-03-20 | Core holder for leak-free pulse permeability test |
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| Publication Number | Publication Date |
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| CN111337406A true CN111337406A (en) | 2020-06-26 |
| CN111337406B CN111337406B (en) | 2024-09-24 |
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| CN202010200815.XA Active CN111337406B (en) | 2020-03-20 | 2020-03-20 | Core holder for leak-free pulse permeability test |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4864846A (en) * | 1988-10-17 | 1989-09-12 | Western Atlas International, Inc. | Self-cleaning poppet valve for a core testing apparatus |
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