CN117760868A - High-temperature high-pressure experimental device, experimental system and experimental method - Google Patents

Abstract

The invention relates to the technical field of experiments of geological samples, and provides a high-temperature high-pressure experimental device, an experimental system and an experimental method, wherein the high-temperature high-pressure experimental device comprises a shell and a triaxial pressure assembly, the triaxial pressure assembly comprises a triaxial pressure assembly and a protective sleeve, a main cavity is arranged in the shell, and at least part of the triaxial pressure assembly is embedded in the main cavity; the axial pressure assembly comprises a first pressure head, a first mounting seat, a second pressure head and a pressure loading structure which are sequentially arranged and distributed along the axial direction of the shell, a sample bin is formed between the first mounting seat and the second mounting seat, and a sample is mounted in the sample bin; the protective sleeve is sleeved on the parts of the first pressure head and the second pressure head, and the first mounting seat, the sample and the second mounting seat; the invention is not only suitable for triaxial experiments of small samples, but also suitable for triaxial experiments of standard-size samples, and further expands the application range of the high-temperature high-pressure experimental device.

Description

High-temperature high-pressure experimental device, experimental system and experimental method

Technical Field

The invention relates to the technical field of experiments of geological samples, in particular to a high-temperature high-pressure experimental device, an experimental system and an experimental method.

Background

Currently, in the prior art, a high-temperature and high-pressure experimental device is mainly used for applying pressure to a sample, such as a geological sample, in a high-temperature and high-pressure environment in three coordinate directions in space so as to perform a triaxial experiment, so as to determine mechanical data of the sample, wherein the mechanical data mainly comprises axial pressure data, confining pressure data, pore pressure data and the like; wherein the geological sample is typically a standard size sample (i.e., a cylindrical sample having a diameter to height ratio of 0.5-1), such as 20mm in diameter and 40mm in height; the high-temperature high-pressure experimental device mainly comprises a shell and an axial pressure assembly arranged in the shell, wherein a sample bin for accommodating a sample is arranged in the middle of the axial pressure assembly, when an axial pressure test is carried out, the high-temperature high-pressure experimental device is required to be placed at a single-shaft press, the top end and the bottom end of the axial pressure assembly are respectively abutted to a frame and a telescopic rod of the single-shaft press, and acting force is applied to the axial pressure assembly through the single-shaft press so as to measure the axial pressure data of the standard-size sample.

However, for some small samples, such as drill cuttings, planetary samples, etc., the sources of such small samples are precious, the number of small volumes are small, and the shape is irregular, so that the aspect ratio of the prepared samples conforming to the experiment is greatly changed, for example, the diameter is 8mm, and the height can be 5-20mm. In addition, in order to avoid the damage influence of external heating on the pressure loading system, the length of the sample loading system is increased, and when the axial pressure is applied to the small sample by the single-shaft press through the shaft pressing assembly, the small sample is easy to bend, incline and other accidents. Therefore, the high-temperature high-pressure experimental device for performing the triaxial test on the standard-size sample cannot perform the triaxial test on the small sample, and therefore the application range of the high-temperature high-pressure experimental device is limited.

Disclosure of Invention

The invention solves the problem of expanding the application range of a high-temperature high-pressure experimental device for carrying out triaxial experiments on samples.

In order to solve the problems, in a first aspect, the invention provides a high-temperature high-pressure experimental device, which comprises a shell and a triaxial pressure assembly, wherein the triaxial pressure assembly comprises a triaxial pressure component and a protective sleeve, a main cavity is arranged in the shell, and at least part of the triaxial pressure component is embedded in the main cavity;

the axial pressure assembly comprises a first pressure head, a first mounting seat, a second pressure head and a pressure loading structure which are sequentially arranged and distributed along the axial direction of the shell, a sample bin is formed between the first mounting seat and the second mounting seat, and a sample is mounted in the sample bin;

the protective sleeve is sleeved on the first pressure head, the second pressure head, the first mounting seat, the sample and the second mounting seat.

Optionally, the triaxial pressure assembly further comprises a third pressure head and a fixed sleeve, the third pressure head is embedded in the main cavity, and the third pressure head is slidably sleeved on the pressure loading structure;

the pressure loading structure comprises a pressure loading rod and an annular bulge which are coaxially arranged, the annular bulge is fixedly sleeved on the circumferential outer wall of the pressure loading rod, a first cavity and a second cavity which are sequentially communicated along the axial direction of the pressure loading rod are arranged in the third pressure head, the fixed sleeve is slidably embedded in the first cavity, and the fixed sleeve is sleeved on the top ends of the second pressure head and the pressure loading rod; the annular protrusion is slidably arranged in the second cavity.

Optionally, a confining pressure cavity is formed between the protective sleeve and the inner wall of the casing;

the triaxial pressure assembly further comprises a heating furnace and two heat conducting sleeves, the shell is of a convex structure, the convex structure is arranged around the sample bin, and the heating furnace is sleeved at the narrow part of the convex structure and is used for heating confining pressure fluid in the confining pressure cavity;

the two heat conducting sleeves are arranged at intervals along the axial direction of the shell, the heat conducting sleeves are sleeved outside the protective sleeve, and the two heat conducting sleeves are respectively wrapped at the joints of the sample and the first mounting seat and the joints of the sample and the second mounting seat;

a first channel for the confining pressure fluid to flow through is formed between the heat conducting sleeve and the inner wall of the shell, and/or a second channel for the confining pressure fluid to flow through is formed between the heat conducting sleeve and the protective sleeve.

Optionally, the triaxial pressure assembly further comprises two heat insulation sleeves, the two heat insulation sleeves are arranged at intervals along the axial direction of the casing, the heat insulation sleeves are sleeved outside the protective sleeve, and the two heat conduction sleeves are positioned between the two heat insulation sleeves;

A third channel for the confining pressure fluid to flow through is formed between the heat insulation sleeve and the inner wall of the shell, and/or a fourth channel for the confining pressure fluid to flow through is formed between the heat insulation sleeve and the protective sleeve.

Optionally, the triaxial pressure assembly further includes a thermocouple, the inner walls of the heat insulation sleeve and the heat conduction sleeve are respectively provided with a mounting groove, one end of the thermocouple is located outside the first pressure head, and the other end of the thermocouple sequentially penetrates through the first pressure head, the mounting grooves of the heat insulation sleeve and the heat conduction sleeve, and extends to the sample bin.

Optionally, the triaxial pressure assembly further comprises a heat insulation ring, the heat insulation ring is sleeved outside the protective sleeve, and the heat insulation ring is located between the heat insulation sleeve and the first pressure head.

Optionally, the triaxial pressure assembly further includes a first sealing ring, a second sealing ring and a detection device, the first sealing ring is embedded between the fixed sleeve and the pressure loading rod, and the second sealing ring is embedded between the fixed sleeve and the third pressure head;

the annular bulge with form the third cavity between the fixed cover, still be equipped with first runner and the second runner of mutual intercommunication on the third pressure head, the second runner passes through first runner with third cavity intercommunication, detection device with the second runner intercommunication is used for detecting whether confining pressure fluid in the confining pressure chamber is in first sealing washer with second sealing washer department produces and reveal, and the air in the third cavity is followed the exhaust pressure of second runner.

Compared with the prior art, when the axial pressure test is carried out on a sample such as a small sample in a triaxial experiment, the top end and the bottom end of the axial pressure component such as the first pressure head and the pressure loading structure are respectively abutted with the fixed frame and the telescopic rod of the press, and the axial pressure is applied to the axial pressure component by the press and acts on the small sample, so that the axial pressure test on the small sample is realized; in the axial pressure test process, as the protective sleeve is sleeved on the lower part of the first pressure head and the upper part of the second pressure head, and the first mounting seat, the sample and the second mounting seat, in other words, the protective sleeve is used for fixing the first pressure head, the second pressure head, the first mounting seat, the sample and the second mounting seat on the same vertical axis all the time, the positioning effect on the sample can be achieved, the sample is effectively prevented from being bent, offset and the like in the axial pressure test process, so that the normal work of the axial pressure test operation is ensured, the axial pressure test device can be suitable for triaxial experiments of small samples, and can be suitable for triaxial experiments of standard-size samples, the application range of the high-temperature high-compaction device is further enlarged, and confining pressure fluid in the subsequent confining pressure test can be effectively prevented from directly entering the sample, so that interference is generated on the subsequent pore pressure test of the sample.

Moreover, because the protective sleeve is only sleeved on the lower part of the first pressure head and the upper part of the second pressure head, in other words, a certain interval is reserved between the top end and the bottom end of the protective sleeve and the top end of the first pressure head and the bottom end of the second pressure head respectively, the interval can be used as the deformation distance of a sample when the press applies axial pressure to the axial pressure assembly, for example, when the axial pressure test is carried out, the sample is compressed and shortened, the distance between the first pressure head and the second pressure head is shortened, the interval reserved between the top end and the bottom end of the protective sleeve can not interfere the axial pressure test operation of the press to the sample through the axial pressure assembly until the axial pressure test is finished, and the top end and the bottom end of the protective sleeve are respectively in tiny interval or offset with the first pressure head and the second pressure head, so that the axial pressure test is ensured to be carried out smoothly.

In addition, the first pressure head, the first mounting seat, the second pressure head and the pressure loading structure can be connected in a split mode, for example, detachable mode, so that samples can be conveniently assembled and disassembled, and in the process of taking out the samples, the second pressure head and the pressure loading structure which are longer in length can be prevented from being broken, the maintenance frequency is correspondingly reduced, and the service life of the pressure loading structure is prolonged.

In a second aspect, another embodiment of the present invention provides an experimental system, including the high-temperature and high-pressure experimental apparatus as described above, and further including a press, where the press includes a frame and a telescopic rod, and opposite ends of a shaft pressing assembly in the high-temperature and high-pressure experimental apparatus are respectively and correspondingly connected to the frame and the telescopic rod.

Because the experimental system comprises the high-temperature high-pressure experimental device, the experimental system at least has all technical effects of the high-temperature high-pressure experimental device, and the description is omitted herein.

In a third aspect, another embodiment of the present invention provides an experimental method, based on the experimental system as described above, comprising the steps of:

processing the selected blank to form a sample meeting experimental requirements;

assembling the sample and the axial compression assembly into a housing of the high-temperature high-pressure experimental device;

applying axial pressure to the shaft pressure assembly through the press so as to perform a shaft pressure experiment and collecting first shaft pressure data in real time;

controlling a confining pressure device of the experiment system to charge confining pressure fluid into a confining pressure cavity where the sample is positioned and the triaxial pressure assembly so as to enable the triaxial pressure assembly to be in a static pressure state;

controlling a pore pressure device to input pore fluid to the sample, increasing the flow of the confining pressure fluid for a plurality of times, applying axial pressure to the shaft pressure assembly for a plurality of times, and collecting and recording mechanical data of the sample;

And storing the mechanical data, unloading the axial pressure, the confining pressure fluid and the pore fluid, disassembling the triaxial pressure assembly, and taking out a sample.

Since the experimental method is based on the experimental system as described above, the experimental method has at least all technical effects of the experimental system, and will not be described herein.

Optionally, the processing the selected blanks to form the test-qualified samples comprises:

selecting blank materials meeting experimental requirements;

fixing and repairing the blank material through a glue;

grinding the repaired blank material to form a sample meeting the experimental requirements.

Drawings

FIG. 1 is a schematic cross-sectional view of a high temperature and high pressure experimental apparatus according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure shown at A in FIG. 1;

FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1;

fig. 4 is an enlarged schematic view of the structure at C in fig. 1.

Reference numerals illustrate:

1-a shell; 101-an upper cover; 102-a body; 103-a base; 2-sample; 3-an axial compression assembly; 31-a first ram; 32-a first mount; 33-a second mount; 34-a second ram; 35-a pressure loading structure; 351—a pressure loading lever; 352-annular protrusion; 4-protecting sleeve; 5-a third ram; 51-confining pressure flow channels; 52-compensating flow channels; 53-a first flow channel; 54-a second flow channel; 6-fixing the sleeve; 7-confining pressure communication members; 8-heating furnace; 9-a heat conducting sleeve; 10-heat insulation sleeve; 11-an insulating ring; 12-fluid entry communication; 13-fluid discharge communication; 14-a third sealing ring.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the coordinate system XZ provided herein, the positive direction of the X axis represents the right direction, the negative direction of the X axis represents the left direction, the positive direction of the Z axis represents the upper direction, and the negative direction of the Z axis represents the lower direction. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

In order to solve the technical problems, as shown in fig. 1, an embodiment of the invention provides a high-temperature high-pressure experimental device, which comprises a casing 1 and a triaxial pressure assembly, wherein the triaxial pressure assembly comprises a triaxial pressure assembly 3 and a protective sleeve 4, a main cavity is arranged in the casing 1, and at least part of the triaxial pressure assembly 3 is embedded in the main cavity;

the axial compression assembly 3 comprises a first pressure head 31, a first mounting seat 32, a second mounting seat 33, a second pressure head 34 and a pressure loading structure 35 which are sequentially arranged and distributed along the axial direction of the shell 1, a sample bin is formed between the first mounting seat 32 and the second mounting seat 33, and a sample 2 is mounted in the sample bin;

The protective sleeve 4 is sleeved on the first pressure head 31 and the second pressure head 34, and the first mounting seat 32, the sample 2 and the second mounting seat 33.

It should be noted that, at least part of the axial compression assembly 3 is located in the main cavity of the casing 1, so the casing 1 provides an installation space for the axial compression assembly 3; the axial direction of the shell 1 is parallel to the Z axis of the coordinate system of FIG. 1; when the shaft pressing assembly 3 is installed in the main cavity, a sample bin is formed between the first installation seat 32 and the second installation seat 33, a sample 2 is installed in the sample bin, and the sample 2 can be a standard-size sample or a small sample; when the axial pressure test is performed, the first pressure head 31 and/or the second pressure head 34 can generate tiny displacement due to the compression of the sample 2, and the protective sleeve 4 is sleeved on the lower part of the first pressure head 31 and the upper part of the second pressure head 34, so that the top end and the bottom end of the protective sleeve 4 can not interfere the axial pressure displacement of the first pressure head 31 and the second pressure head 34, thereby ensuring that the axial pressure test is performed smoothly.

Preferably, at least one sealing gasket is arranged between the top end inner wall of the protective sleeve 4 and the upper end outer wall of the first pressure head 31 and between the bottom end inner wall of the protective sleeve 4 and the lower end outer wall of the second pressure head 34, when the protective sleeve 4 and the sample 2 generate certain axial compression deformation in the axial compression test process, the deformation of the sample 2 generally does not exceed 20%, the first pressure head 31 and the second pressure head 34 generate vertical tiny displacement, and certain intervals are reserved between the top end of the protective sleeve 4 and the lower part of the first pressure head 31 and between the bottom end of the protective sleeve 4 and the upper part of the second pressure head 34, so that the top end and the bottom end of the protective sleeve do not interfere in the distance reduction process between the first pressure head 31 and the second pressure head 34; and the two sets of gaskets can also prevent confining pressure fluid from entering the sample along the inner wall of the protective sleeve 4 from the intervals between the top end of the protective sleeve 4 and the upper end of the first pressure head 31 and the bottom end of the protective sleeve 4 and the lower end of the second pressure head 34 in the subsequent confining pressure test process, so as to avoid interference to the subsequent pore pressure test result of the sample. The protective sleeve 4 can be a copper sleeve, and can also be other metal sleeves with certain mechanical rigidity and sealing property.

Compared with the prior art, in the embodiment, when the axial pressure test is performed on the sample 2, such as a small sample, in the triaxial experiment, the top end and the bottom end of the axial pressure assembly 3, such as the first pressure head 31 and the pressure loading structure 35, are respectively abutted against the fixed frame and the telescopic rod of the press, and the axial pressure is applied to the axial pressure assembly 3 through the press and acts on the small sample, so that the axial pressure test on the small sample is realized; in the axial pressure test process, the protective sleeve 4 is sleeved on the lower part of the first pressure head 31 and the upper part of the second pressure head 34, and the first mounting seat 32, the sample 2 and the second mounting seat 33, in other words, the protective sleeve 4 fixes the first pressure head 31, the second pressure head 34, the first mounting seat 32, the sample 2 and the second mounting seat 33 on the same vertical axis all the time, so that the positioning effect on the sample 2 can be achieved, the sample 2 is effectively prevented from being bent, deflected and the like in the axial pressure test process, so that the normal work of the axial pressure test operation is ensured, the axial pressure test device can be suitable for triaxial experiments of small samples, and can also be suitable for triaxial experiments of standard-size samples, the application range of the high-temperature high-pressure test device is further enlarged, and the ambient pressure fluid can be effectively prevented from directly entering the sample 2 in the subsequent ambient pressure test by means of the sealing gasket between the protective sleeve 4 and the first pressure head 31 and the second pressure head 34, so that the subsequent pore pressure test on the sample 2 is disturbed.

Moreover, because the protective sleeve 4 is only sleeved on the part of the first pressure head 31 and the part of the second pressure head 34, in other words, a certain interval is reserved between the top end and the bottom end of the protective sleeve 4 and the top end of the first pressure head 31 and the bottom end of the second pressure head 34 respectively, the interval can be used as the deformation distance of the sample when the press applies axial pressure to the axial pressure assembly 3, for example, when the axial pressure test is performed, the sample 2 is compressed and shortened, the distance between the first pressure head 31 and the second pressure head 34 is shortened, in the process, the interval reserved between the top end and the bottom end of the protective sleeve 4 can not interfere the axial pressure test operation of the press to the sample 2 through the axial pressure assembly 3 until the axial pressure test is finished, and a tiny interval or a tiny interval exists between the top end of the protective sleeve 4 and the bottom end of the first pressure head 31 and the bottom end of the second pressure head 34 respectively, so that the protective sleeve 4 can not interfere the axial pressure test operation of the small sample through the axial pressure assembly 3.

In addition, the first pressure head 31, the first mounting seat 32, the second mounting seat 33, the second pressure head 34 and the pressure loading structure 35 can be detachably connected in a split manner, so that the sample 2 can be conveniently assembled and disassembled, and in the process of taking out the sample 2, the second pressure head 34 and the pressure loading structure 35 which are longer in length can be prevented from being broken, the maintenance frequency is correspondingly reduced, and the service life of the pressure loading structure is prolonged.

In one embodiment of the present invention, as shown in fig. 1 and 2, the triaxial pressure assembly further includes a third pressure head 5 and a fixing sleeve 6, the third pressure head 5 is embedded in the main cavity, and the third pressure head 5 is slidably sleeved in the pressure loading structure 35;

the pressure loading structure 35 comprises a pressure loading rod 351 and an annular protrusion 352 which are coaxially arranged, the annular protrusion 352 is fixedly sleeved on the circumferential outer wall of the pressure loading rod 351, a first cavity and a second cavity which are sequentially communicated along the axial direction of the pressure loading rod 351 are arranged in the third pressure head 5, the fixed sleeve 6 is embedded in the first cavity, and the fixed sleeve 6 is sleeved on the top ends of the second pressure head 34 and the pressure loading rod 351; the annular protrusion 352 is slidably disposed within the second cavity.

It should be noted that, referring to fig. 2 to fig. 4, the casing 1 may include an upper cover 101, a main body 102 and a base 103, where a main cavity is disposed inside the main body 102, the shaft pressing assembly 3 is disposed inside the main cavity, the upper cover 101 is disposed at a top end of the main body 102, and the upper cover 101 and the top end of the main body 102 may be connected by a threaded connection, where the upper cover 101 is connected to the first pressing head 31 of the shaft pressing assembly 3, so as to prevent the first pressing head 31 from being separated from the upper cover 101 when the shaft pressing test is performed; the base 103 is disposed at the bottom end of the main body 102, and the base 103 and the bottom end of the main body 102 may be fastened by bolts, and the base 103 is connected with the third ram 5 of the shaft pressing assembly 3, so as to support the third ram 5 from the bottom.

When the axial pressure is applied to the sample 2 by the press through the axial pressure assembly 3, the sample 2 can deform and shrink to a certain extent, the pressure loading structure 35 can axially displace relative to the third pressure head 5, the annular protrusion 352 can axially move in the second cavity, the fixing sleeve 6 can play an upper limit role on the annular protrusion 352, and the inner bottom wall of the second cavity can play a lower limit role on the annular protrusion 352. The first cavity provides an installation space for the fixing sleeve 6, and since the fixing sleeve 6 is sleeved on the top ends of the second pressure head 34 and the pressure loading rod 351, the fixing sleeve 6 can also apply circumferential supporting force to the second pressure head 34 and the pressure loading rod 351 while limiting the upper limit of the annular protrusion 352, so that the pressure loading structure 35 is prevented from bending deformation in the axial pressure testing process due to overlong length, and the accuracy of the axial pressure testing of the sample 2 is further ensured.

Wherein the pressure loading rod 351 and the annular protrusion 352 may be an integrally formed structure, thereby ensuring a certain mechanical rigidity and strength of the pressure loading structure 35.

In one embodiment of the present invention, as shown in fig. 1 and 3, a confining pressure cavity is formed between the protective sleeve 4 and the inner wall of the casing 1;

The triaxial pressure assembly further comprises a heating furnace 8 and two heat conducting sleeves 9, the machine shell 1 is of a convex structure, the convex structure is arranged around the sample bin, and the heating furnace 8 is sleeved at the narrow part of the convex structure;

the two heat conducting sleeves 9 are arranged at intervals along the axial direction of the casing 1, the heat conducting sleeves 9 are sleeved outside the protective sleeve 4, and the two heat conducting sleeves 9 are respectively wrapped at the joint of the sample 2 and the first mounting seat 32 and the joint of the sample 2 and the second mounting seat 33;

a first channel for the passage of the confining pressure fluid is formed between the heat conducting sleeve 9 and the inner wall of the casing 1, and/or a second channel for the passage of the confining pressure fluid is formed between the heat conducting sleeve 9 and the protective sleeve 4.

It should be noted that, a confining pressure cavity is formed between the outer wall of the protecting sleeve 4 and the inner wall of the casing 1, the convex structure may be an annular convex structure, where the convex structure includes a narrow portion and a wide portion distributed along the axial direction of the casing 1 and integrally formed, the narrow portion is located above the wide portion, and the diameter of the narrow portion is smaller than that of the wide portion; the heating furnace 8 is including being a plurality of heating hoods of annular arrangement, surround the partial structure of parcel in casing 1 main part 102 promptly the narrow portion region department of protruding structure when annular arrangement's a plurality of heating hoods to can evenly disperse the heat that produces from circumference through annular arrangement's a plurality of heating hoods, and transmit to the confined pressure chamber of parcel sample storehouse more fast through protruding portion department, in order to heat the confined pressure fluid of confined pressure intracavity, and then through being annular arrangement's a plurality of heating hoods, so that the confined pressure fluid of confined pressure intracavity is heated more evenly from circumference, effectively improve heating efficiency and heating effect to sample 2.

The first mounting seat 32 and the second mounting seat 33 can be cylindrical structures made of corundum ceramics, so that the first mounting seat 32 and the second mounting seat 33 are ensured to have certain mechanical rigidity, strength and high temperature resistance, and further the high temperature and high pressure experimental requirements of the sample 2 are met. The first mounting seat 32 and the second mounting seat 33 may be configured as an elongated cylindrical structure according to the characteristics of the experimental device.

The heat conducting sleeve 9 can be a sleeve structure made of graphite material, and because the heat conducting sleeve 9 is sleeved on the protective sleeve 4, and the bottom end of the heat conducting sleeve 9 positioned above extends and wraps the joint of the first mounting seat 32 and the sample 2, the top end of the heat conducting sleeve 9 positioned below extends and wraps the joint of the second mounting seat 33 and the sample 2, so that the two heat conducting sleeves 9 can respectively perform circumferential fixation protection on the first mounting seat 32 and the sample 2 as well as the sample 2 and the second mounting seat 33, the positioning action on the sample 2 is further enhanced, and the problems of bending, deformation, crushing and the like of the slender first mounting seat 32 and the slender second mounting seat 33 in the axial compression test process are prevented; moreover, since the first channel for the confining pressure fluid to flow through is formed between the heat conducting sleeve 9 and the inner wall of the casing 1, and/or the second channel for the confining pressure fluid to flow through is formed between the heat conducting sleeve 9 and the protecting sleeve 4, the heated confining pressure fluid can pass through the first channel and/or the second channel and flow to the sample bin and be transferred to the sample 2 through the protecting sleeve 4, so as to provide a high temperature environment for the sample 2, and when the second channel is formed between the heat conducting sleeve 9 and the protecting sleeve 4 and the confining pressure fluid passes through the second channel, the heat conducting sleeve 9 can also transfer the heat of the confining pressure fluid to the sample 2 more uniformly, so that the heat distribution around the sample 2 is more uniform and is more close to the geological environment in which the sample 2 is located, and the accuracy of each mechanical data in the triaxial experiment of the sample 2 is improved.

In addition, the heat conducting sleeve 9 has good heat conducting property, so that the confining pressure fluid can be heated to a certain extent, the temperature of the periphery of the sample 2 is prevented from being reduced too fast, the sample 2 is in a high-temperature environment required by an experiment for a long time, and the accuracy of mechanical data in the triaxial experiment of the sample 2 is further improved.

Furthermore, since the two heat conducting sleeves 9 are arranged at intervals along the axial direction of the casing 1, in other words, the two heat conducting sleeves 9 are of a split structure of an upper section and a lower section, the convenience of loading and unloading the sample 2 can be improved; specifically, if the two heat-conducting sleeves 9 are integrally formed, if there is a slight deformation of the sample 2 in the protective sheath 4, the heat-conducting sleeves 9 are not easily taken out from the outside of the protective sheath 4 after the end of the experiment.

Specifically, the vertical section of the main body 102 of the casing 1 is of a convex structure, so that the narrow part of the convex structure ensures that the triaxial pressure assembly meets certain high-pressure-resistant safety, the heating furnace 8 at the narrow part of the convex structure can transfer generated heat to confining pressure fluid in the confining pressure cavity more rapidly and more intensively, and as the two heat conducting sleeves 9 are arranged at intervals along the axial direction of the main body 102 in the casing 1 and the heat conducting sleeves 9 are sleeved outside the protective sleeve 4, the heating furnace 8 heats the confining pressure fluid and simultaneously heats the two heat conducting sleeves 9, and at the moment, the heat of the heating furnace 8 can be transferred to a sample bin more rapidly and more uniformly through the protective sleeve 4 by the heat conducting sleeves 9 and the confining pressure fluid, so that the experimental efficiency of the sample 2 in a high-temperature environment can be improved, the heating efficiency of the heating furnace 8 on the sample bin can be improved, and the temperature of the surrounding environment of the sample 2 can be correspondingly improved, so that the triaxial pressure assembly can meet the current high-temperature and high-pressure experimental requirements.

In addition, as shown in fig. 2, the triaxial pressure assembly further includes a confining pressure communicating member 7, a confining pressure inlet, a confining pressure runner 51 and a compensating runner 52 are provided on the third pressure head 5, one end of the confining pressure communicating member 7 is used for communicating confining pressure devices for providing confining pressure fluid, the other end is communicated with the confining pressure inlet, a confining pressure cavity is formed between the protective sleeve 4 and the inner wall of the casing 1, and two ends of the confining pressure runner 51 are respectively communicated with the confining pressure inlet and the confining pressure cavity; and a compensation cavity is formed between the annular bulge 352 and the inner bottom wall of the second cavity, and two ends of the compensation runner 52 are respectively communicated with the confining pressure inlet and the compensation cavity.

The confining pressure communication member 7 may be a sealed pipe joint in which confining pressure fluid output from the confining pressure device enters the confining pressure flow channel 51 through the confining pressure inlet. The confining pressure device is used for inputting confining pressure fluid into the confining pressure cavity through the confining pressure inlet.

In general, when the confining pressure device performs confining pressure test on the sample 2, the press loads axial pressure on the sample 2 through the axial pressure assembly 3, so that when the pressure loading structure 35 in the axial pressure assembly 3 slides up and down relative to the third pressure head 5 of the casing 1, the confining pressure fluctuation on the sample 2 is likely to be caused, and the accuracy of confining pressure test on the sample 2 is further affected; therefore, when the confining pressure test is performed, the compensating bin is communicated with the compensating runner 52, so that after confining pressure fluid output by the confining pressure device enters the confining pressure inlet, the confining pressure fluid is split, one part of the confining pressure fluid enters the compensating bin through the compensating runner 52, and the other part of the confining pressure fluid enters the confining pressure cavity through the confining pressure runner 51 until the confining pressure fluid flows to the outer area of the protecting sleeve 4 corresponding to the sample 2, and at the moment, confining pressure is applied to the sample 2 through the protecting sleeve 4 by confining pressure fluid in the confining pressure cavity, so that the confining pressure test of the sample 2 is realized.

Specifically, through with compensation storehouse and confining pressure chamber intercommunication, when pressure loading structure 35 upwards extrudees the motion, confining pressure in the confining pressure chamber rises, and the compensating storehouse internal pressure can reduce correspondingly, and confining pressure fluid in the confining pressure chamber can flow into the compensating storehouse through compensating runner this moment in through confining pressure runner to guarantee confining pressure storehouse internal pressure unchanged, avoid confining pressure fluctuation. Conversely, when the pressure loading structure 35 moves back downwards, the confining pressure in the confining pressure cavity is reduced, and the annular bulge in the pressure loading structure 35 moves downwards to correspondingly enlarge the pressure in the compensating bin, so that confining pressure fluid in the compensating bin can enter the confining pressure cavity through the compensating runner and the confining pressure runner, and the pressure in the confining pressure bin is also ensured to be unchanged, and the confining pressure fluctuation is avoided.

In one embodiment of the present invention, the triaxial pressure assembly further includes two heat insulation sleeves 10, the two heat insulation sleeves 10 are arranged at intervals along the axial direction of the casing 1, the heat insulation sleeves 10 are sleeved outside the protective sleeve 4, and the two heat conduction sleeves 9 are located between the two heat insulation sleeves 10;

a third passage for the confining pressure fluid to flow through is formed between the heat insulating sleeve 10 and the inner wall of the casing 1, and/or a fourth passage for the confining pressure fluid to flow through is formed between the heat insulating sleeve 10 and the protective sheath 4.

It should be noted that, the heat insulation sleeve 10 may be a sleeve structure made of metal, for example, titanium alloy, since the heat insulation sleeve 10 is sleeved on the protective sleeve 4, and the upper heat insulation sleeve 10 is located above the heat conduction sleeve 9, the lower heat insulation sleeve 10 is located below the heat conduction sleeve 9, where the top end of the upper heat insulation sleeve 10 extends and wraps the part of the first pressure head 31, and the bottom end of the lower heat insulation sleeve 10 extends and wraps the part of the second pressure head 34, so that the two heat insulation sleeves 9 and the two heat insulation sleeves 10 are matched, the first pressure head 31, the first mounting seat 32, the second mounting seat 33 and the second pressure head 34 in the axial compression assembly 3 and the sample 2 can be fixed on the same axis, and are circumferentially fixed and protected, so as to further prevent the elongated first mounting seat 32 and the second mounting seat 33 from bending, deforming, breaking and other problems during the axial compression test; moreover, the confining pressure fluid can flow to the sample bin from the third channel and/or the fourth channel, and because the heat conduction directions of the heat conducting sleeve 9 and the heat insulating sleeve 10 are different, the heat convection of the confining pressure fluid when flowing through the second channel and the fourth channel can be effectively reduced, so that the heat of the confining pressure fluid is more concentrated on the sample 2 in the protective sleeve 4, the temperature measurement accuracy of the sample 2 by the thermocouple is ensured, and the temperature of the sample 2 is prevented from generating larger fluctuation.

In addition, the heat insulating sleeve 10 above the sample 2 can reduce the upward transfer of heat generated by the heating furnace 8 to correspondingly reduce the influence of the heat on the tightness between the first pressure head 31 and the inner wall of the casing 1, while the heat insulating sleeve 10 below the sample 2 can reduce the downward transfer of heat generated by the heating furnace 8 to correspondingly reduce the influence of the heat on the tightness between the third pressure head 5 and the inner wall of the casing 1.

Furthermore, since the two heat-insulating sleeves 10 are arranged at intervals along the axial direction of the casing 1, in other words, the two heat-insulating sleeves 10 are of a split structure of an upper section and a lower section, the convenience of loading and unloading the sample 2 can be improved; specifically, if the two heat insulating sleeves 10 are integrally formed, if there is a slight deformation of the sample 2 in the protective sheath 4, the heat insulating sleeves 10 are not easily taken out from the outside of the protective sheath 4 after the end of the experiment.

In one embodiment of the present invention, the triaxial pressure assembly further includes a thermocouple, the inner walls of the heat insulation sleeve 10 and the heat conduction sleeve 9 are respectively provided with a mounting groove, one end of the thermocouple is located outside the first pressure head 31, and the other end of the thermocouple sequentially penetrates through the first pressure head 31 and the mounting grooves of the heat insulation sleeve 10 and the heat conduction sleeve 9 and extends to the sample bin.

It should be noted that the number of thermocouples may be at least one; in the process of loading the sample 2, one end of a thermocouple is positioned at the outer side of the first pressure head 31 and is connected with a temperature control device, and the other end of the thermocouple sequentially penetrates through the first pressure head 31, the mounting groove of the heat insulation sleeve 10 and the mounting groove of the heat conduction sleeve 9 and extends to the sample bin so as to detect the temperature of the sample 2 in real time.

The temperature of the confining pressure cavity can also be measured, for example, one end of another thermocouple is positioned outside the first pressure head 31 and is connected with a temperature control device, the other end of the other thermocouple is positioned at different height positions of the confining pressure cavity, and different temperatures of the confining pressure cavity at different heights are measured for detecting the difference of the temperatures in the confining pressure cavity.

The protective sheath 4 can be the copper pipe, all sets up the mounting groove that is used for thermocouple to pass in heat conduction sleeve 9 and insulating tube 10's inside, and this mounting groove is used for fixing the position that the thermocouple is located to prevent that the position of thermocouple from producing the change in the axle pressure in-process, in order to improve the degree of accuracy to sample 2 temperature acquisition.

Since the second channel for the confining pressure fluid to flow is formed between the heat conducting sleeve 9 and the protective sleeve 4, and the fourth channel for the confining pressure fluid to flow is formed between the heat insulating sleeve 10 and the protective sleeve 4, when the sample is subjected to the axial compression test, the axial compression deformation is generated on the sample, so that the second channel and the fourth channel respectively provide deformation spaces for the heat conducting sleeve 9 and the heat insulating sleeve 10, so that the heat conducting sleeve 9 and the heat insulating sleeve 10 are prevented from being deformed axially along with the axial deformation of the sample when the axial deformation occurs, and the heat conducting sleeve 9 and the heat insulating sleeve 10 are crushed, thereby protecting the heat conducting sleeve 9 and the heat insulating sleeve 10.

In addition, the temperature of the sample bin can be fed back to the temperature of the sample 2, and the temperature of the sample 2 collected by the thermocouple is received through the temperature control device to control the operation and stop of the heating furnace 8, so that the temperature of the sample bin is controlled.

In one embodiment of the present invention, as shown in connection with fig. 1 and 4, the triaxial pressure assembly further includes an insulating ring 11, the insulating ring 11 is sleeved outside the protective sleeve 4, and the insulating ring 11 is located between the insulating sleeve 10 and the first pressure head 31.

It should be noted that, on the basis that the heat-insulating sleeve 10 reduces the heat of the heat-conducting sleeve 9, the heat-insulating ring 11 is used for reducing the heat transfer to the third sealing ring 14 installed between the first pressure head 31 and the inner wall of the main body 102 of the casing 1 again, so as to avoid that the heat reduces the tightness between the first pressure head 31 and the inner wall of the main body 102 of the casing 1, and effectively avoid that the confining pressure fluid is discharged outwards from the third sealing ring 14; moreover, the heat-insulating ring 11 also protects the tightness between the first ram 31 and the protective sheath 4, avoiding that confining pressure fluid enters the sample and is in fluid communication with the aperture. Wherein, the heat insulation ring 11 can adopt a circular ring structure supported by polytetrafluoroethylene materials.

In one embodiment of the present invention, as shown in fig. 2 and 4, the triaxial pressure assembly further includes a fluid inlet communication member 12 and a fluid outlet communication member 13, and the inside of the axial pressure assembly 3 is provided with a fluid inlet flow channel and a fluid outlet flow channel, respectively, the fluid inlet communication member 12 and the fluid outlet communication member 13 are respectively in communication with the fluid inlet communication member 12 and the fluid outlet communication member 13, respectively, and the fluid inlet communication member 12 is used for communicating pore pressure means for providing pore fluid;

the fluid inlet flow channel and the fluid outlet flow channel extend to opposite end surfaces of the sample 2, respectively.

It should be noted that, a fluid inlet flow channel is disposed in the interior of the part of the structure of the axial compression assembly 3 below the sample 2, the fluid inlet communication member 12 may be disposed at the bottom end of the fluid inlet flow channel formed on the pressure loading structure 35 in the axial compression assembly 3, a fluid outlet flow channel is disposed in the interior of the part of the structure of the axial compression assembly 3 above the sample 2, and the fluid outlet communication member 13 may be disposed at the top end of the fluid outlet flow channel formed on the first pressure head 31 in the axial compression assembly 3; the fluid inlet communication 12 is for communication with a pore pressure device providing pore fluid.

Of course, in other embodiments, the fluid inlet flow channel may be disposed on the axial compression assembly 3 above the sample 2, and the fluid outlet flow channel may be disposed on the axial compression assembly 3 below the sample 2.

When the pore pressure test is performed on the sample 2, the pore fluid can be output through the pore pressure device, then enters the sample 2 from the lower end along the fluid inlet flow channel, permeates inside the sample 2, and is discharged from the fluid outlet flow channel, so that the pore pressure test on the sample 2 is realized.

In one embodiment of the present invention, as shown in fig. 2, the triaxial pressure assembly further includes a first sealing ring, a second sealing ring and a detection device, the first sealing ring is embedded between the fixing sleeve 6 and the pressure loading rod 351, and the second sealing ring is embedded between the fixing sleeve 6 and the third pressure head 5;

the third cavity is formed between the annular protrusion 352 and the fixed sleeve 6, the third pressure head 5 is further provided with a first flow channel 53 and a second flow channel 54 which are mutually communicated, the second flow channel 54 is communicated with the third cavity through the first flow channel 53, the detection device is communicated with the second flow channel 54 and is used for detecting whether the confining pressure fluid conveyed into the confining pressure cavity by the confining pressure device leaks at the first sealing ring and the second sealing ring, and the air in the third cavity is exhausted from the exhaust pressure of the second flow channel 54.

It should be noted that, the first sealing ring is embedded between the inner wall of the fixing sleeve 6 and the outer wall of the pressure loading rod 351, so the first sealing ring is used for sealing the fixing sleeve 6 and the pressure loading rod 351; the second sealing ring is embedded between the outer wall of the fixed sleeve 6 and the circumferential inner wall of the third pressure head 5 in the first cavity, so that the second sealing ring is used for sealing the fixed sleeve 6 and the third pressure head 5.

A third cavity is formed between the top end of the annular protrusion 352 and the bottom end of the fixed sleeve 6, wherein it can be understood that the compensation chamber, the part of the cavity where the annular protrusion 352 is located and the third cavity together form a second cavity of the third pressure head 5; when the axial pressure is applied to the sample 2 by the press through the axial pressure assembly 3, the sample 2 is compressed, the annular protrusion 352 moves upwards in the second cavity, the volume of the compensation chamber becomes larger, and the volume of the third cavity becomes smaller, so that the original air in the third cavity can be discharged along the second flow channel 54 through the first flow channel 53 to ensure the axial pressure test of the sample 2, and the detection device can detect the exhaust pressure in the third cavity discharged from the second flow channel 54, and the exhaust pressure can also be used as an axial pressure data parameter in subsequent mechanical data.

The pressure sensor may be disposed on a pipeline in communication with the second flow channel 54, for example, when the confining pressure device inputs confining pressure fluid into the confining pressure cavity and acts on the sample 2 to perform confining pressure test, if the pressure sensor has a number of degrees, it may be determined that confining pressure fluid flows through a gap between the fixed sleeve 6 and the pressure loading rod 351 or between the fixed sleeve 6 and the third pressure head 5 and is discharged through the first flow channel 53 and the second flow channel 54, which may indicate that leakage may occur in the first sealing ring or the second sealing ring, so the detecting device may be used to detect whether leakage occurs in the confining pressure fluid conveyed into the confining pressure cavity by the confining pressure device at the first sealing ring and the second sealing ring.

Another embodiment of the present invention provides an experimental system, including the high-temperature and high-pressure experimental apparatus as described above, and further including a press, where the press includes a frame and a telescopic rod, and opposite ends of the shaft pressing assembly 3 in the high-temperature and high-pressure experimental apparatus are respectively and correspondingly connected to the frame and the telescopic rod.

It should be noted that, the press may be a single-shaft press, when the high-temperature and high-pressure experimental device is installed at the press, the two ends of the shaft pressing assembly 3, such as the first pressing head 31 and the pressure loading structure 35, are respectively connected with the frame and the telescopic rod of the press, and the telescopic rod of the press may apply axial pressure to the sample 2 from the lower direction.

The experiment system further comprises a confining pressure device, a pore pressure device and a cooling device, wherein the confining pressure device is communicated with the confining pressure communicating piece 7 so as to convey confining pressure fluid into the confining pressure cavity through the confining pressure communicating piece 7, and confining pressure is applied to the position, corresponding to the sample 2, of the protective sleeve 4 so as to realize confining pressure testing of the sample 2; the pore pressure device may input pore fluid through the fluid inlet communication 12 to the fluid inlet flow channel to perform a pore pressure test on the sample 2.

The triaxial pressure assembly still includes the third sealing washer, the outer wall of first pressure head 31 is close to third sealing washer 14 department is equipped with annular groove structure, annular groove structure's center pin with the center pin coincidence of casing 1, annular groove structure with form between the casing 1 and be used for right the cooling storehouse of third sealing washer cooling, still be equipped with two cooling runners on the first pressure head 31, two the one end of cooling runner communicates respectively the cooling storehouse, each the other end of cooling runner passes through respectively the cooling tube intercommunication heat sink.

It should be noted that, when the container main body 102 performs the triaxial experiment, the cooling medium can be output through the cooling device, enter the cooling bin through one cooling channel, and be discharged from the other cooling channel, so as to cool and cool the first pressure head 31 through the circulating cooling medium, thereby effectively reducing the temperature of the third sealing ring 14, and preventing the third sealing ring 14 from being damaged by the high temperature of the sample 2; the cooling device may be a chiller in the prior art, so long as it can provide cold water or other cooling media, so that the water cooling device for cooling the first pressure head 31 is suitable for the present technical solution, and is not limited herein.

The experimental system has all technical effects of the high-temperature high-pressure experimental device and is not described herein.

Another embodiment of the present invention provides an experimental method, based on the experimental system as described above, comprising the steps of:

s1, processing the selected blank to form a sample 2 meeting experimental requirements; wherein the sample 2 is a cylindrical sample.

It should be noted that, the blank may be a standard size sample, or may be a small sample, such as a blank with irregular shape, a blank with smaller initial volume (e.g. drilling cuttings, planetary sample), etc., where the small sample cannot be directly subjected to triaxial experiments, and then the selected blank needs to be processed to form sample 2 meeting the experimental requirements.

And S2, assembling the sample 2 and the axial compression assembly 3 in the shell 1 of the high-temperature high-pressure experimental device.

It should be noted that, the sample 2, the shaft pressing assembly 3, the protective sleeve 4, the third pressing head 5, the two heat conducting sleeves 9 and the two heat insulating sleeves 10 are installed in the main body 102 of the casing 1 according to a certain assembling sequence to form a triaxial pressure assembly, at this time, the third pressing head 5 and the pressure loading structure 35 are located below the sample 2 (see fig. 2), and the first pressing head 31 and the cooling bin are located above the sample 2.

And S3, applying axial pressure to the shaft pressure assembly 3 through the press so as to perform a shaft pressure experiment and collecting first shaft pressure data in real time.

It should be noted that, when the high temperature and high pressure testing device is placed on the press, the first pressing head 31 and the pressure loading structure 35 are correspondingly abutted against the fixed frame and the telescopic rod of the press respectively, so that the axial upward pressure can be applied to the axial pressure component 3 in the triaxial pressure assembly by the press to perform the axial pressure test on the sample 2, and the first axial pressure data of the sample 2 is collected in real time, wherein the first axial pressure data at least comprises the rising height of the axial pressure rod structure and the axial pressure value of the press on the sample 2.

S4, controlling the confining pressure device of the experiment system to charge confining pressure fluid into the confining pressure cavity where the sample 2 is located and the triaxial pressure assembly so that the triaxial pressure assembly is in a static pressure state.

The confining pressure device is used for outputting confining pressure fluid, wherein the confining pressure fluid output by the confining pressure device is split after passing through the confining pressure inlet of the third pressure head 5, one part of the confining pressure fluid enters the confining pressure cavity along the confining pressure entering flow channel 51 and flows to the sample bin, so that the confining pressure is applied to the protecting sleeve 4 to serve as confining pressure of the sample 2, and the other part of the confining pressure fluid enters the compensating bin along the compensating flow channel 52, and when the pressure is axially loaded and expanded, the confining pressure fluctuation in the confining pressure cavity above the pressure loading structure 35 is caused when the pressure loading structure 35 slides up and down relative to the third pressure head 5 of the casing 1, so that the axial pressure applied to the sample 2 is the same as the confining pressure applied in the circumferential direction, and the triaxial pressure assembly is in a static pressure state.

S5, controlling a pore pressure device to input pore fluid into the sample 2, increasing the flow of the confining pressure fluid for a plurality of times, applying axial pressure to the shaft pressure assembly 3 for a plurality of times, and collecting and recording mechanical data of the sample 2.

It should be noted that, the experimental system further includes a temperature control device, where the thermocouple is electrically connected with a signal end of the temperature control device, and the temperature control device is electrically connected with the heating furnace 8, and is used to control the operation or stop of the heating furnace 8 according to the operating temperature of the sample 2.

The pore pressure device outputs pore fluid to load a certain pore pressure (below the confining pressure), and then the pressure of the pore fluid is collected and recorded by an external detection device such as a pressure sensor.

The flow of the confining pressure fluid can be increased to the confining pressure cavity for a plurality of times through the confining pressure device, and the current confining pressure data of the recorded sample 2 are collected; different axial pressures may be applied to the axial compression assembly 3 multiple times by the press and current axial pressure data of the recorded sample 2 may be collected.

The mechanical data includes current pore pressure data, current confining pressure data and current shaft pressure data corresponding to the sample 2 when the flow rate of the pore fluid, the flow rate of the confining pressure fluid, the axial pressure and the axial displacement of the sample 2 are increased each time.

S6, storing the mechanical data, unloading the axial pressure, the confining pressure fluid and the pore fluid, disassembling the triaxial pressure assembly, and taking out the sample 2.

It should be noted that, in the process of performing the triaxial experiment of the axial pressure, the confining pressure and the pore pressure on the sample 2 under the high-temperature and high-pressure condition on the sample 2, after the mechanical data of the sample 2 is collected in real time, the experiment is ended, the mechanical data is preferably stored at this time, then the axial pressure, the confining pressure fluid and the pore fluid are unloaded, the triaxial pressure assembly is disassembled, and the sample 2 is taken out.

Since the experimental method is based on the experimental system as described above, the experimental method has at least all technical effects of the experimental system, and will not be described herein.

In one embodiment of the invention, S1, the processing of the selected blanks to form sample 2 meeting the experimental requirements comprises:

s11, selecting blank materials meeting experimental requirements;

s12, fixing and repairing the blank material through a glue;

and S13, grinding the repaired blank material to form a sample 2 meeting the experimental requirements.

It should be noted that in step S11, a manual selection manner may be adopted to select a blank material meeting the experimental requirements, where the blank material may be a standard size sample, a precious sample, an irregularly shaped sample, or a sample with a smaller initial volume (such as drilling cuttings and planetary samples).

In step S12, the blank may be placed in a container on a workbench, and a glue such as epoxy resin is poured into the surface of the blank, then the blank with the glue is fixed by a fixture, and then the blank with the glue is repaired by a tool to form a blank with a shape similar to a cylinder.

In step S13, the repaired blank may be ground by a tool or lathe to form a sample 2, such as a cylindrical sample 2, meeting the experimental requirements.

Although the invention is disclosed above, the scope of the invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. The high-temperature high-pressure experimental device is characterized by comprising a shell (1) and a triaxial pressure assembly, wherein the triaxial pressure assembly comprises a triaxial pressure assembly (3) and a protective sleeve (4), a main cavity is arranged in the shell (1), and at least part of the triaxial pressure assembly (3) is embedded in the main cavity;

the axial pressure assembly (3) comprises a first pressure head (31), a first mounting seat (32), a second mounting seat (33), a second pressure head (34) and a pressure loading structure (35) which are sequentially arranged and distributed along the axial direction of the shell (1), a sample bin is formed between the first mounting seat (32) and the second mounting seat (33), and a sample (2) is mounted in the sample bin;

The protective sleeve (4) is sleeved on the first pressure head (31) and the second pressure head (34), and the first mounting seat (32), the sample (2) and the second mounting seat (33).

2. The high-temperature high-pressure experimental device according to claim 1, wherein the triaxial pressure assembly further comprises a third pressure head (5) and a fixed sleeve (6), the third pressure head (5) is embedded in the main cavity, and the third pressure head (5) is slidably sleeved in the pressure loading structure (35);

the pressure loading structure (35) comprises a pressure loading rod (351) and an annular bulge (352) which are coaxially arranged, the annular bulge (352) is fixedly sleeved on the circumferential outer wall of the pressure loading rod (351), a first cavity and a second cavity which are sequentially communicated along the axial direction of the pressure loading rod (351) are arranged in the third pressure head (5), the fixed sleeve (6) is embedded in the first cavity, and the fixed sleeve (6) is sleeved on the top ends of the second pressure head (34) and the pressure loading rod (351); the annular protrusion (352) is slidably disposed within the second cavity.

3. The high-temperature and high-pressure experimental device according to claim 2, characterized in that a confining pressure cavity is formed between the protective sleeve (4) and the inner wall of the casing (1);

The triaxial pressure assembly further comprises a heating furnace (8) and two heat conducting sleeves (9), the casing (1) is of a convex structure, the convex structure is arranged around the sample bin, and the heating furnace (8) is sleeved at the narrow part of the convex structure and is used for heating confining pressure fluid in the confining pressure cavity;

the two heat conducting sleeves (9) are arranged at intervals along the axial direction of the shell (1), the heat conducting sleeves (9) are sleeved outside the protective sleeve (4), and the two heat conducting sleeves (9) are respectively wrapped at the joint of the sample (2) and the first mounting seat (32) and the joint of the sample (2) and the second mounting seat (33);

a first channel for the confining pressure fluid to flow through is formed between the heat conducting sleeve (9) and the inner wall of the casing (1), and/or a second channel for the confining pressure fluid to flow through is formed between the heat conducting sleeve (9) and the protective sleeve (4).

4. A high temperature and high pressure experimental device according to claim 3, characterized in that the triaxial pressure assembly further comprises two heat insulation sleeves (10), the two heat insulation sleeves (10) are arranged at intervals along the axial direction of the casing (1), the heat insulation sleeves (10) are sleeved outside the protective sleeve (4), and the two heat conduction sleeves (9) are positioned between the two heat insulation sleeves (10);

A third channel for the confining pressure fluid to flow through is formed between the heat insulation sleeve (10) and the inner wall of the shell (1), and/or a fourth channel for the confining pressure fluid to flow through is formed between the heat insulation sleeve (10) and the protective sleeve (4).

5. The high-temperature high-pressure experimental device according to claim 4, wherein the triaxial pressure assembly further comprises a thermocouple, the inner walls of the heat insulation sleeve (10) and the heat conduction sleeve (9) are provided with mounting grooves, one end of the thermocouple is positioned outside the first pressure head (31), and the other end of the thermocouple sequentially penetrates through the first pressure head (31) and the mounting grooves of the heat insulation sleeve (10) and the heat conduction sleeve (9) and extends to the sample bin.

6. The high temperature and high pressure experimental device according to claim 4, characterized in that the triaxial pressure assembly further comprises a heat insulation ring (11), the heat insulation ring (11) is sleeved outside the protective sleeve (4), and the heat insulation ring (11) is positioned between the heat insulation sleeve (10) and the first pressure head (31).

7. A high temperature and high pressure experimental device according to claim 3, characterized in that the triaxial pressure assembly further comprises a first sealing ring, a second sealing ring and a detection device, wherein the first sealing ring is embedded between the fixed sleeve (6) and the pressure loading rod (351), and the second sealing ring is embedded between the fixed sleeve (6) and the third pressure head (5);

The annular bulge (352) and form the third cavity between fixed cover (6), still be equipped with first runner (53) and second runner (54) of mutual intercommunication on third pressure head (5), second runner (54) pass through first runner (53) with third cavity intercommunication, detection device with second runner (54) intercommunication is used for detecting the confined pressure fluid in the confined pressure chamber is in first sealing washer with second sealing washer department produces and reveal, and the air in the third cavity is followed exhaust pressure of second runner (54).

8. An experimental system, characterized by comprising the high-temperature and high-pressure experimental device according to any one of claims 1 to 7, and further comprising a press, wherein the press comprises a frame and a telescopic rod, and opposite ends of an axial compression assembly (3) in the high-temperature and high-pressure experimental device are respectively and correspondingly connected with the frame and the telescopic rod.

9. An experimental method, based on the experimental system of claim 8, comprising the steps of:

machining the selected blank to form a sample (2) meeting experimental requirements; wherein the sample (2) is a cylindrical sample;

assembling the sample (2) and the axial compression assembly (3) in a housing (1) of the high-temperature high-pressure experimental device;

Applying axial pressure to the shaft pressure assembly (3) through the press so as to perform a shaft pressure experiment and collecting first shaft pressure data in real time;

controlling a confining pressure device of the experiment system to charge confining pressure fluid into a confining pressure cavity where the sample (2) is positioned and the triaxial pressure assembly so as to enable the triaxial pressure assembly to be in a static pressure state;

controlling a pore pressure device to input pore fluid into the sample (2), increasing the flow of the confining pressure fluid for a plurality of times, applying axial pressure to the shaft pressure assembly (3) for a plurality of times, and collecting and recording mechanical data of the sample (2);

and (3) storing the mechanical data, unloading the axial pressure, the confining pressure fluid and the pore fluid, disassembling the triaxial pressure assembly, and taking out a sample (2).

10. The method of claim 9, wherein processing the selected blanks to form the test-compliant sample (2) comprises:

selecting blank materials meeting experimental requirements;

fixing and repairing the blank material through a glue;

grinding the repaired blank material to form a sample (2) meeting the experimental requirements.