CN113848163A - Core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress - Google Patents
Core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress Download PDFInfo
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- CN113848163A CN113848163A CN202111127537.0A CN202111127537A CN113848163A CN 113848163 A CN113848163 A CN 113848163A CN 202111127537 A CN202111127537 A CN 202111127537A CN 113848163 A CN113848163 A CN 113848163A
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- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 230000035699 permeability Effects 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 56
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims description 17
- 230000007704 transition Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000005755 formation reaction Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Fluid Mechanics (AREA)
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- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress, and belongs to the field of oil and gas reservoir evaluation test instruments. Comprises a shell, a pressurizing device, a sealing device and a flow guide device. The pressure device includes axial pressure head and horizontal pressure head, and the axial pressure head includes 2 axial pressure heads with rock sample top surface and bottom surface butt. The horizontal indenter comprises a plurality of horizontal indenters abutting each side of the rock sample. The PEFT heat-shrinkable tube is sleeved outside the 2 axial pressure heads and the rock sample. The flow guide device comprises an annular flow guide groove and a flow guide pipe, the annular flow guide groove is communicated with a flow guide hole arranged on the axial pressure head, the flow guide hole is arranged on the contact surface of the axial pressure head and the rock sample, and the flow guide pipe is communicated with the annular flow guide groove. The invention solves the problem that the existing rock core holder can not simulate the formation conditions of high temperature and high pore pressure, can simulate the porosity and permeability test conditions of real formations under high temperature, high pressure and true triaxial stress, and has more accurate test results.
Description
Technical Field
The invention belongs to the field of oil and gas reservoir evaluation testing instruments, and particularly relates to a core holder for porosity and permeability testing under high-temperature high-pressure true triaxial stress.
Background
The accurate measurement of the porosity and the permeability of an oil and gas reservoir is the key of the evaluation of the oil and gas reservoir, and the core holder is a core device for completing the porosity and permeability test experiment of the rock. The technology for measuring the physical parameters of the core under the conditions of simulating the high temperature, the high pressure and the stress of the stratum is a development trend in the field of core analysis in the global range, and provides a new challenge for the design of the core holder.
At present, rock porosity and permeability tests are mainly carried out under the conditions of confining pressure or confining pressure and axial pressure, and although the tests are carried out under a partial true triaxial stress state, the formation conditions simulating high temperature and high pore pressure cannot be met. Chinese patent CN205103247U discloses a true triaxial core holder, which is controlled by the tightness between rock sample and pressure head, so that it can not satisfy the formation conditions of simulating high temperature and high pore pressure; chinese patent CN111443026A discloses a true triaxial three-way seepage core holder, which adopts a six-way sealing sleeve, but it cannot realize the loading of confining pressure fluid, and can only use gas seepage to measure permeability.
Disclosure of Invention
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the invention.
The invention provides a core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress, which solves the technical problem that the existing core holder cannot meet the stratum condition for simulating high-temperature and high-pore pressure, and has the characteristics of capability of simulating the porosity and permeability test condition under the high-temperature, high-pressure and true triaxial stress of a real stratum and more accurate test result.
The invention discloses a core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress, which is used for porosity and permeability test under high-temperature high-pressure true triaxial stress and comprises a shell, a pressurizing device, a sealing device and a flow guide device;
the pressurizing device further comprises
The axial pressure heads comprise 2 axial pressure heads which are abutted with the top surface and the bottom surface of the rock sample;
the horizontal pressing heads comprise a plurality of horizontal pressing heads which are abutted with the side surfaces of the rock sample, and the number of the horizontal pressing heads is the same as that of the side surfaces of the rock sample;
the sealing device is arranged as
The heat shrink tube is sleeved outside the 2 axial pressure heads and the rock sample;
the flow guiding device further comprises
The annular flow guide groove is communicated with a flow guide hole arranged on the axial pressure head, and the flow guide hole is arranged on the contact surface of the axial pressure head and the rock sample;
the flow guide pipe is communicated with the annular flow guide groove;
the housing, the rock sample, the pressurizing means and the sealing means enclose a closed space for injecting a fluid.
In some of these embodiments, the rock sample is in the shape of a cube with rounded corners and the number of horizontal indenters is 4.
In some of the embodiments, the end of the axial indenter away from the rock sample is provided with curved steps and grooves distributed circumferentially along the outer circumference of the axial indenter.
In some embodiments, the heat shrinkable tube is made of PEFT.
In some of these embodiments, the axial ram and the horizontal ram are flanged to the housing.
In some of these embodiments, still include the sealed sealing washer that seals axial pressure head and the flange junction, and horizontal pressure head and the flange junction.
In some embodiments, the draft tube and the annular draft groove are disposed within the axial head.
In some of these embodiments, a high pressure metering pump is also included, the high pressure metering pump further comprising
The number of the first high-pressure metering pumps is 1, and the first high-pressure metering pumps are connected with the axial pressure head;
the number of the second high-pressure metering pumps is 2, and the second high-pressure metering pumps are respectively connected with the two pairs of the horizontal pressure heads which are symmetrically distributed;
the number of the third high-pressure metering pumps is 1, and the third high-pressure metering pumps are connected with the shell to enable the outer side of the heat shrinkable tube to be filled with confining pressure fluid;
and the number of the fourth high-pressure metering pumps is 1, and the fourth high-pressure metering pumps are connected with the flow guide device.
In some embodiments, the high pressure metering pump is connected to the axial ram and the horizontal ram by an axial ram.
In some of these embodiments, the axial ram and the horizontal ram transition from a square near one side of the core sample to a circle on the other side.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress, which has the characteristics of capability of simulating porosity and permeability test conditions under real stratum high-temperature, high-pressure and true triaxial stress and more accurate test results.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a cross-sectional view of a core holder according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the axial ram and rock sample configuration of a core holder provided in an embodiment of the invention;
fig. 3 is a perspective view of a baffle hole and an annular baffle groove of a core holder according to an embodiment of the invention;
fig. 4 is a schematic structural view of a diversion hole and an annular diversion trench of a core holder according to an embodiment of the present invention;
description of the drawings: 1. an axial ram; 2. a horizontal pressure head; 3. heat shrink tubing; 4. an annular diversion trench; 5. a flow guide pipe; 6. a flange; 7. a housing; 8. a rock sample; 9. a curved surface step; 10. and (4) a groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments provided by the present invention, belong to the protection scope of the present invention.
It is obvious that the drawings in the following description are only examples or embodiments of the invention, from which it is possible for a person skilled in the art, without inventive effort, to apply the invention also in other similar contexts. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one of ordinary skill in the art that the described embodiments of the present invention can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention are not to be construed as limiting in number, and may be construed to cover both the singular and the plural. The present invention relates to the terms "comprises," "comprising," "includes," "including," "has," "having" and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in the description of the invention are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The terms "first," "second," and the like, as referred to herein, are used merely to distinguish similar objects from one another and do not denote a particular ordering for the objects.
The embodiment of the invention provides a core holder for porosity and permeability tests under high-temperature high-pressure true triaxial stress, and fig. 1 is a schematic cross-sectional view of the core holder according to the embodiment of the invention. Referring to fig. 1, the core holder is used for porosity and permeability test under high-temperature high-pressure true triaxial stress, and at least comprises a shell 7, a pressurizing device, a sealing device and a flow guide device. The pressurizing device further comprises an axial ram 1 and a horizontal ram 2 for providing triaxial stress to the rock sample 8 to simulate the ground stress to which the rock sample 8 is subjected in a real formation. Wherein, the axial pressure head 1 comprises 2 axial pressure heads 1 which are abutted with the top surface and the bottom surface of the rock sample 8. The horizontal indenter 2 comprises a plurality of horizontal indenters 2 abutting against each side of the rock sample 8, and the number of the horizontal indenters 2 is the same as the number of the sides of the rock sample 8. The sealing device is a heat shrinkable tube 3, the heat shrinkable tube 3 is sleeved outside the 2 axial pressure heads 1 and the rock sample 8, specifically, as shown in fig. 2, the 2 axial pressure heads 1 and the middle cubic rock core sample are sealed after being subjected to heat treatment by the heat shrinkable tube 3, and the true triaxial stress loading can be realized by matching with the horizontal pressure head 2 in the horizontal direction. The guiding device further comprises an annular guiding groove 4 and a guiding pipe 5, as shown in fig. 3 and 4, the annular guiding groove 4 is communicated with a guiding hole arranged on the axial pressure head 1, the guiding hole is arranged on the contact surface of the axial pressure head 1 and the rock sample 8, the guiding pipe 5 is communicated with the annular guiding groove 4, and optionally, the guiding pipe 5 is a metal pipe and is used for conducting fluid in the rock. Optionally, the draft tube 5 and the annular draft groove 4 are arranged in the axial pressure head 1 in a penetrating manner. The housing 7, the rock sample 8, the pressurizing device and the sealing device enclose a closed space, and optionally, the housing 7 is provided with a fluid inlet and a fluid outlet for injecting fluid. The rock core holder can simulate the ground stress of a rock sample 8 in a real stratum by arranging the axial pressure head 1 and the horizontal pressure head 2; by arranging the flow guide device for fluid conduction in the rock, the pore pressure is realized by injecting fluid into the rock core through the flow guide hole, the heat shrinkable tube 3 is in close contact with the rock sample 8 after heat treatment under the action of confining pressure, the injected fluid can be prevented from flowing between the rock sample 8 and the heat shrinkable tube 3, the fluid is discharged through the flow guide hole of the circumferential pressure head at the bottom, and the permeability is calculated by measuring the discharged amount; the closed space can be used for injecting hot fluid to increase confining pressure and heat the rock core. The core holder can simulate the porosity and permeability test conditions of a real stratum under high temperature, high pressure and true triaxial stress, and the test result is more accurate. Optionally, the material of the heat shrinkable tube 3 is a PEFT, and the heat-treated PEFT heat shrinkable tube 3 is used for sealing, because the PEFT heat shrinkable tube 3 can endure high temperature (200 ℃) and high pressure (100 MPa).
Optionally, the rock sample 8 is in a cube shape with rounded corners, and the number of the horizontal pressing heads 2 is 4, which is beneficial to sealing the rock sample 8 and the axial pressing head 1 through the heat-treated PEFT heat shrinkable tube 3. In order to further improve the sealing effect, one end of the axial pressure head 1, which is far away from the rock sample 8, is provided with a curved surface step 9 and a groove 10 which are distributed along the peripheral circumference of the axial pressure head 1.
Optionally, the axial ram 1 and the horizontal ram 2 are connected to the housing 7 via a flange 6. In order to improve the sealing performance of the connection, the sealing device also comprises sealing rings for sealing the connection part of the axial pressure head 1 and the flange 6 and the connection part of the horizontal pressure head 2 and the flange 6.
Further, still include the high pressure measuring pump, the high pressure measuring pump further includes first high pressure measuring pump, second high pressure measuring pump, third high pressure measuring pump, and fourth high pressure measuring pump, first high pressure measuring pump quantity is 1, link to each other with axial pressure head 1, second high pressure measuring pump quantity is 2, link to each other with two pairs of horizontal pressure heads 2 of symmetric distribution respectively, third high pressure measuring pump quantity is 1, link to each other with the casing, make the pyrocondensation pipe outside be full of the confined pressure fluid, fourth high pressure measuring pump quantity is 1, link to each other with guiding device. Optionally, the high-pressure metering pump is connected with the axial pressure head 1 and the horizontal pressure head 2 through the axial pressure plunger. The axial pressure borne by the rock sample 8 is realized by injecting the top axial compression plunger through 1 high-pressure metering pump, and the stress in the horizontal direction is realized by injecting the symmetrical axial compression plungers in the horizontal direction through 2 high-pressure metering pumps respectively, so that the condition that the stresses in three directions are unequal can be met. The strain condition of the rock sample 8 can be monitored simultaneously under the boundary conditions of real stratum high temperature, high pressure and stress by changing the output pressure or flow of each metering pump.
Further, the axial pressure head 1 and the horizontal pressure head 2 are in transition from a square shape close to one side of the core sample to a round shape on the other side.
The working process of the core holder is as follows:
the axial pressure head 1 and the rock sample 8 are fixed on the rotary table in sequence, the PEFT heat shrinkable tube 3 is wrapped outside the axial pressure head 1 and the rock sample 8, the PEFT heat shrinkable tube 3 is heated by a hot air gun, the rotary stage is used for heating while the rotary stage is used for heating, the PEFT heat shrinkable tube 3 is heated and shrunk, the PEFT heat shrinkable tube 3 is gradually heated according to the sequence from the upper pressure head to the rock core sample 8 and then to the lower pressure head, the middle part of the heated PEFT heat shrinkable tube 3 can be tightly attached to a rock core, the two ends of the heated PEFT heat shrinkable tube 3 can be tightly attached to the square-round pressure head, the sealing step of the pressure head is enabled to have a better sealing effect, the strength and the thickness of the PEFT heat shrinkable tube 3 after being heated and deformed are increased, and the compressive strength of the PEFT heat shrinkable tube is enhanced.
In the experimental process, a first high-pressure metering pump and a second high-pressure metering pump are used for applying triaxial stress to a rock sample 8, a third high-pressure metering pump is used for providing confining pressure fluid for the outer side of the PEFT, a fourth high-pressure metering pump is used for connecting a flow guide device, pore fluid is injected into rock pores, and the conditions of the ground stress, the pore pressure and the temperature of the rock in a deep stratum are simulated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a porosity permeability test is with rock core holder under high temperature high pressure true triaxial stress for porosity permeability test under high temperature high pressure true triaxial stress, its characterized in that: comprises a shell, a pressurizing device, a sealing device and a flow guide device;
the pressurizing device further comprises
The axial pressure heads comprise 2 axial pressure heads which are abutted with the top surface and the bottom surface of the rock sample;
the horizontal pressing heads comprise a plurality of horizontal pressing heads which are abutted with the side surfaces of the rock sample, and the number of the horizontal pressing heads is the same as that of the side surfaces of the rock sample;
the sealing device is arranged as
The heat shrink tube is sleeved outside the 2 axial pressure heads and the rock sample;
the flow guiding device further comprises
The annular flow guide groove is communicated with a flow guide hole arranged on the axial pressure head, and the flow guide hole is arranged on the contact surface of the axial pressure head and the rock sample;
the flow guide pipe is communicated with the annular flow guide groove;
the housing, the rock sample, the pressurizing means and the sealing means enclose a closed space for injecting a fluid.
2. The core holder as recited in claim 1, wherein: the rock sample is in a cubic shape with rounded edges and corners, and the number of the horizontal pressing heads is 4.
3. The core holder as recited in claim 1, wherein: one end of the axial pressure head, which is far away from the rock sample, is provided with curved surface steps and grooves which are circumferentially distributed along the periphery of the axial pressure head.
4. The core holder as recited in claim 1, wherein: the heat shrinkable tube is made of PEFT.
5. The core holder as recited in claim 1, wherein: the axial pressure head and the horizontal pressure head are connected with the shell through flanges.
6. The core holder as recited in claim 5, wherein: the sealing ring is used for sealing the joint of the axial pressure head and the flange and the joint of the horizontal pressure head and the flange.
7. The core holder as recited in claim 1, wherein: the honeycomb duct reaches annular guiding gutter wears to locate in the axial pressure head.
8. The core holder as recited in claim 2, wherein: also comprises a high-pressure metering pump, and the high-pressure metering pump further comprises
The number of the first high-pressure metering pumps is 1, and the first high-pressure metering pumps are connected with the axial pressure head;
the number of the second high-pressure metering pumps is 2, and the second high-pressure metering pumps are respectively connected with the two pairs of the horizontal pressure heads which are symmetrically distributed;
the number of the third high-pressure metering pumps is 1, and the third high-pressure metering pumps are connected with the shell to enable the outer side of the heat shrinkable tube to be filled with confining pressure fluid;
and the number of the fourth high-pressure metering pumps is 1, and the fourth high-pressure metering pumps are connected with the flow guide device.
9. The core holder as recited in claim 8, wherein: and the high-pressure metering pump is connected with the axial pressure head and the horizontal pressure head through an axial pressure plunger.
10. The core holder as recited in claim 2, wherein: and the axial pressure head and the horizontal pressure head are in transition from a square shape close to one side of the core sample to a circular shape on the other side.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127537.0A CN113848163A (en) | 2021-09-26 | 2021-09-26 | Core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111127537.0A CN113848163A (en) | 2021-09-26 | 2021-09-26 | Core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress |
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| 胡隆伟 等: "室内岩石力学试验", 西南交通大学出版社, pages: 486 - 487 * |
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