CN110552674A - true triaxial contains microorganism coal body fracturing experimental apparatus - Google Patents
true triaxial contains microorganism coal body fracturing experimental apparatus Download PDFInfo
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- CN110552674A CN110552674A CN201910763585.5A CN201910763585A CN110552674A CN 110552674 A CN110552674 A CN 110552674A CN 201910763585 A CN201910763585 A CN 201910763585A CN 110552674 A CN110552674 A CN 110552674A
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- 239000003245 coal Substances 0.000 title claims abstract description 33
- 244000005700 microbiome Species 0.000 title claims description 4
- 230000009471 action Effects 0.000 claims abstract description 25
- 238000012360 testing method Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000000813 microbial effect Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 24
- 230000000087 stabilizing effect Effects 0.000 claims description 23
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 239000011435 rock Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a true triaxial microbial-containing coal body fracturing experimental device which comprises a pressure loading device, wherein the pressure loading device comprises a test piece switching assembly, a side loading assembly and an axial loading assembly, the test piece switching assembly comprises an inner frame body and a plurality of action plates, and through holes are formed in four side walls of the inner frame body; the action plate is arranged in the through hole in a sliding manner, and the edge of the action plate is coated with an elastic sleeve; the side loading assembly comprises an outer frame body and four side loading bodies, the lower end of the outer frame body is fixed on the base, and the four side loading bodies are respectively fixed on four side walls of the outer frame body; the side loading carrier applies pressure to the acting plate; the axial loading assembly is positioned right above the inner frame body; still include high pressure water components, high pressure water components includes fracturing pipe, fracturing pump and water pressure record appearance. The experimental device can be used for realizing the experiment of the coal body in a column shape, a cube shape or a cuboid shape, can save the processing process of the coal body, and has the advantages of simplified experimental process, convenient operation and high experimental accuracy.
Description
Technical Field
The invention relates to the technical field of hydraulic fracturing experiments, in particular to a true triaxial microbial-containing coal body fracturing experiment device.
Background
In the aspect of experimental research of hydraulic fracturing, the domestic existing devices and methods are mainly classified into two types, one type is a simulated triaxial experimental device and method, and a coal rock sample is placed under the simulated triaxial stress condition to carry out a fracturing experiment; the other type is a true triaxial experiment device and method, and the coal rock sample is placed under a true triaxial stress condition to perform a fracturing experiment. As the stress environment of the coal rock mass under the underground is different stress in each direction, the fracturing experiment under the true triaxial stress condition is more consistent with the actual condition on site and has more significance.
the true triaxial experimental device generally adopts a cubic or cuboid sample, and the loading and unloading of the three-dimensional stress of the sample are realized through a pressurizing plate. In practice, the processing of cubic or rectangular test pieces is difficult, especially for brittle rock masses (such as coal), it is difficult to ensure that each surface is smooth and to ensure that two opposite planes are perfectly parallel. The occurrence of the phenomenon greatly increases the processing cost, and because the processing process has strict requirements, once deviation occurs, smooth loading of three-dimensional stress is difficult to ensure, so that a large coal rock mass must be selected again for processing. The problem is well solved by adopting the columnar coal rock mass, and a cylinder with a smoother surface can be processed by adopting the cylindrical drill bit only by fixing the large coal rock mass, so that the processing cost of the sample is greatly reduced. Therefore, it is urgently needed to develop a fracturing experimental device suitable for columnar coal bodies.
Disclosure of Invention
The invention aims to solve the technical problem of providing a true triaxial microbial-containing coal body fracturing experimental device which can adapt to a cuboid or columnar coal body for experiment.
In order to solve the technical problems, the technical scheme of the invention is as follows: true triaxial contains microorganism coal body fracturing experimental apparatus, including the base, be equipped with pressure loading device on the base, pressure loading device includes
A test piece adapter assembly comprising
The inner frame body is a rectangular frame body with openings at the upper end and the lower end; through holes are formed in the four side walls of the inner frame body;
the action plates are arranged in the through holes in a sliding mode, and elastic sleeves are wrapped on the edges, facing the center of the inner frame body, of the action plates;
A side-loading assembly comprising
the outer frame body is a rectangular frame body with openings at the upper end and the lower end; the lower end of the outer frame body is fixed on the base;
The four side loading bodies are respectively fixed on four side walls of the outer frame body; the side loading body applies pressure to the acting plate;
the axial loading assembly is positioned right above the inner frame body;
The high-pressure water component comprises a fracturing pipe, a fracturing pump for supplying water to the fracturing pipe and a water pressure recorder for monitoring the water pressure in the fracturing pipe.
preferably, the side loading body comprises
The cylinder sleeve is fixed on the outer frame body, and a telescopic rod is arranged in the cylinder sleeve in a sliding mode; and the contact pressing plate is fixed on the telescopic rod.
preferably, the side loading body comprises
the pressure stabilizing device comprises a base body, wherein a pressure stabilizing cavity is arranged in the base body, oil inlet and outlet holes are formed in the pressure stabilizing cavity, and a plurality of guide holes penetrating through the outer wall of the pressure stabilizing cavity are uniformly distributed in the pressure stabilizing cavity on the side wall facing the action plate; a cover plate is fixed on the side surface of the base body facing the action plate, a plurality of limiting holes are formed in the cover plate, the limiting holes correspond to the guide holes one to one, and the diameter of each limiting hole is smaller than that of each guide hole;
And the ejector rod is arranged in the guide hole in a sliding manner, a plurality of sealing bodies are arranged at one end of the ejector rod close to the pressure stabilizing cavity, the outer diameter of each sealing body is matched with the inner diameter of the guide hole and is larger than the inner diameter of the limiting hole, and the other end of the ejector rod penetrates through the limiting hole and extends out of the base body.
as a preferable technical scheme, the distance between two adjacent ejector rods in the same horizontal plane is smaller than the thickness of the action plate.
As a preferable technical scheme, the width of the pressure stabilizing cavity in the sliding direction of the ejector rod is smaller than the length of the ejector rod.
preferably, the axial loading assembly comprises
The loading head is fixed on a telescopic rod of the hydraulic machine, and the fracturing pipe is fixed on the loading head;
and the pressing plate is provided with a stepped hole in the middle, the diameter of the upper end of the stepped hole is larger than that of the lower end of the stepped hole, the inner diameter of the large end of the stepped hole is matched with the outer diameter of the loading head, and the inner diameter of the small end of the stepped hole is matched with the outer diameter of the fracturing pipe.
Preferably, the fracturing pipe comprises
the connecting pipe is fixedly connected with the loading head;
One end of the insertion pipe is connected with the connecting pipe, a sealing assembly and a fixing assembly are arranged on the outer side of the insertion pipe,
The sealing assembly comprises a plurality of sealing rings, and a buffer groove is formed between every two adjacent sealing rings; the fixed subassembly includes a plurality of cards, the card closes on the one end of connecting pipe is fixed on the outer wall of insert tube, with card position corresponding department be equipped with on the outer wall of insert tube and get the pressure hole, the outside in getting the pressure hole covers there is the flexure strip, the flexure strip with the outer wall of insert tube forms sealed chamber.
as a preferable technical scheme, the elastic sheet is a polytetrafluoroethylene membrane or a polyurethane membrane.
as a preferable technical scheme, guide tables are respectively arranged on the upper end surface and the lower end surface of the acting plate, and guide grooves for accommodating the guide tables are arranged on the inner wall of the through hole.
As a preferable technical scheme, the elastic sleeve is a rubber sleeve.
By adopting the technical scheme, the true triaxial microbial-containing coal fracturing experimental device can realize the experiment of columnar, cubic or cuboid coal and realize the hydraulic fracturing experiment of a columnar sample under the true three-dimensional stress condition. The experimental device can save the processing process of the coal body, simplify the experimental process, and has convenient operation and high experimental accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic structural diagram of a first implementation of a side loading apparatus in an embodiment of the invention;
FIG. 4 is a schematic structural diagram of a second embodiment of a side loading device in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an inner frame body according to an embodiment of the present invention;
FIG. 6 is a schematic view of the construction of an action plate in an embodiment of the invention;
FIG. 7 is a schematic view showing an assembled structure of an acting plate and an elastic sleeve in the embodiment of the present invention;
FIG. 8 is a schematic structural view of a side-loading carrier in an embodiment of the present invention;
FIG. 9 is a sectional view taken along line A-A of FIG. 8;
FIG. 10 is a schematic structural view of an axial loading assembly in an embodiment of the present invention;
FIG. 11 is a schematic view of the structure of an insertion tube in an embodiment of the present invention.
Detailed Description
As shown in fig. 1 and 2, the true triaxial microbial-containing coal fracturing experimental device comprises a base 1, wherein a pressure loading device is arranged on the base 1, the pressure loading device comprises a test piece switching assembly 6, the test piece switching assembly 6 comprises an inner frame body 61 and a plurality of action plates 62, the inner frame body 61 is a rectangular frame body with openings at the upper end and the lower end, and is formed by bending and welding high-strength metal plates. As shown in fig. 5, through holes 611 are formed on four side walls of the inner frame 61; the action plate 62 is slidably disposed in the through hole 611, and as shown in fig. 6 and 7, the edge of the action plate 62 facing the center of the inner frame 61 is covered with an elastic cover 63. Be equipped with the guide table 621 on the up end of acting plate 62 and the lower terminal surface respectively, be equipped with the guide way 612 that holds guide table 621 on the inner wall of through-hole 611, not only can carry on spacingly to acting plate 62, simultaneously, reasonable distance that sets up between two guide ways can realize that two adjacent acting plates 62 paste together to do not have the coverage of difference to the test piece, can not have the effort blank region between two acting plates 62. The elastic sleeve 63 is a rubber sleeve and has certain deformation capacity, and after a load is applied to the acting plate 62, the elastic sleeve 63 can be well attached to the appearance of a test piece after deformation, and the acting force applied to the test piece is uniform and stable.
The side loading assembly 3 is further included, as shown in fig. 3 and 4, the side loading assembly 3 includes an outer frame 31 and four side loading bodies, the outer frame 31 is a rectangular frame with openings at the upper and lower ends, and is formed by bending and welding high-strength metal plates. The lower end of the outer frame 31 is fixed on the base 1; the four side loading bodies are respectively fixed on the four side walls of the outer frame body 31; the side loading body 31 applies pressure to the acting plate 62.
when the plate 62 is only used as a disposable test article, the acting plate 62 is firstly placed on the acting plate 62 along the cylindrical surface of the columnar test article, the acting plate 62 is positioned through a hydraulic clamp and other devices, and then the flush cross section is cut at one end of the plurality of acting plates 62, which is not provided with the elastic sleeves 63, through a cutting device, at the moment, the side loading body applies pressure to the acting plate 62 by adopting a contact pressure plate 33 as shown in fig. 3, the test article further comprises a cylinder sleeve 34, the cylinder sleeve 34 is fixed on the outer frame body 31, and the telescopic rod 32 is arranged in the cylinder sleeve 34 in a sliding manner; the contact pressure plate 33 is fixed to the telescopic bar 32. Although the cutting process of the action plate 62 is increased in this way, the side loading body has a simple structure and low manufacturing and processing costs.
If the acting plate 62 is not suitable for cutting, a side loading body as shown in fig. 4 can be adopted, as shown in fig. 4, 8 and 9, the side loading body comprises a base body 35 and an ejector rod 36, a pressure stabilizing cavity 351 is arranged in the base body 35, an oil inlet and outlet hole 352 is arranged in the pressure stabilizing cavity 351, and a plurality of guide holes 353 penetrating through the outer wall of the pressure stabilizing cavity 351 are uniformly distributed on the side wall of the pressure stabilizing cavity 351 facing the acting plate 62; a cover plate 354 is fixed on the side of the base 35 facing the action plate 62, a plurality of limiting holes 355 are formed in the cover plate 354, the limiting holes 355 correspond to the guide holes 353 one to one, and the diameter of each limiting hole 355 is smaller than that of each guide hole 353. The ejector rod 36 is arranged in the guide hole 353 in a sliding mode, a plurality of sealing bodies 356 are arranged at one end, close to the pressure stabilizing cavity 351, of the ejector rod 36, the sealing bodies 356 can adopt sealing rings, the outer diameter of each sealing body 356 is matched with the inner diameter of the guide hole 353, and sliding sealing is formed between the sealing bodies 356 and the inner wall of the guide hole 353; the outer diameter of the sealing body 356 is larger than the inner diameter of the limiting hole 355, the other end of the ejector rod 36 penetrates through the limiting hole 355 and extends out of the base body 35, and the limiting hole 355 limits the sliding of the ejector rod 36 to prevent the ejector rod from slipping out of the base body 35. The width of the pressure stabilizing cavity 351 in the sliding direction of the ejector rod 36 is limited to be smaller than the length of the ejector rod 36, the length of the ejector rod 36 extending into the pressure stabilizing cavity 351 can be limited by the inner wall of the pressure stabilizing cavity 351, and the ejector rod 36 is prevented from sliding from the guide hole 353 into the pressure stabilizing cavity 351. Although the structure of this side with the carrier is complicated, need not to work board 62 and process and can realize stable loading, convenient implementation and commonality are strong, not only can experiment to the coal body of column, also can directly experiment to the coal body of cube or cuboid. The distance between two adjacent top rods 36 in the same horizontal plane is smaller than the thickness of the action plates 62, and pressure can be loaded on each action plate 62, so that the acting force is stable.
The device also comprises a high-pressure water assembly 5 and an axial loading assembly 4, wherein the high-pressure water assembly 5 comprises a fracturing pipe 51, a fracturing pump 53 for supplying water to the fracturing pipe 51, and a hydraulic pressure recorder 52 for monitoring the water pressure in the fracturing pipe 51. The axial loading assembly 4 is located directly above the inner frame 31. As shown in fig. 10 and 11, the axial loading assembly 4 includes a loading head 42 and a pressure plate 41, the loading head 42 is fixed on the telescopic rod of the hydraulic machine, and the fracturing pipe 51 is fixed on the loading head 42. The loading head 42 is provided with a water channel 421 which is communicated with the fracturing pipe 51 and a pipeline 422 connected with the fracturing pump 53. A stepped hole 411 is arranged in the middle of the pressure plate 41, the diameter of the upper end of the stepped hole 411 is larger than that of the lower end of the stepped hole 411, and the inner diameter of the large end of the stepped hole 411 is matched with the outer diameter of the loading head 42 and is used for being connected with the loading head 42; the inner diameter of the small end of the stepped hole 411 is adapted to the outer diameter of the fracturing pipe 51 for the fracturing pipe 51 to pass through. The fracturing pipe 51 comprises a connecting pipe 511 and an inserting pipe 512, wherein the connecting pipe 511 is fixedly connected with the loading head 42; one end of the insertion pipe 512 is connected with the connecting pipe 511, a sealing component and a fixing component are arranged on the outer side of the insertion pipe 512, the sealing component comprises a plurality of sealing rings 517, and a buffer groove 518 is formed between every two adjacent sealing rings 517; the plurality of seal rings 517 form a plurality of seal faces, and the sealing effect is good. The securing assembly includes a plurality of tabs 514, the plurality of tabs 514 being evenly distributed along the circumference of the insertion tube 512. One end of the clamping sheet 514, which is close to the connecting pipe 511, is fixed on the outer wall of the insertion pipe 512 through a fixing seat 513, a pressure taking hole 515 is arranged on the outer wall of the insertion pipe 512 at the position corresponding to the clamping sheet 514, an elastic sheet 516 covers the outer side of the pressure taking hole 515, and the elastic sheet 516 and the outer wall of the insertion pipe 512 form a sealed cavity, wherein the elastic sheet 516 is a polytetrafluoroethylene membrane or a polyurethane membrane. The elastic piece 516 may be adhered to the outer wall of the insertion tube 512 or may be fixed by a connecting member such as a clip.
during the experiment, the test piece and the axial loading component 4 are assembled firstly,
Step 11, slowly lowering the loading head and adjusting the position of the test piece, and inserting the pressure reduction cracking pipe 51 into a pre-drilled pore channel of the test piece;
Step 12, adjusting the position of the pressure plate 42 relative to the test piece;
And step 13, continuously descending the loading head, applying a certain pressure on the upper end surface of the test piece, and matching with the base 1 to finish the primary fixation of the test piece.
Then the side wall of the test piece is preloaded,
Step 21, adjusting the position of each action plate 62 relative to the outer side surface of the test piece to enable each action plate 62 to be tightly attached to the outer side surface of the test piece; selecting whether to cut the action plate 62 or not according to the difference of the selected side loading carriers;
At step 22, a fixed, clamping force is applied to the apply plate 62 through the load ports 21, 22, 23, and 24.
And finally, carrying out the test on the sample,
Step 31, pressurizing a test piece through a pressure plate 41 and four loading bodies;
Step 32, pumping high-pressure water into the fracturing pipe 51 by a fracturing pump 53;
In step 33, the change of water pressure during the whole experiment is recorded by the water pressure recorder 52.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. true triaxial contains microorganism coal body fracturing experimental apparatus, including the base, be equipped with pressure loading device on the base, its characterized in that: the pressure loading device comprises
a test piece adapter assembly comprising
The inner frame body is a rectangular frame body with openings at the upper end and the lower end; through holes are formed in the four side walls of the inner frame body;
The action plates are arranged in the through holes in a sliding mode, and elastic sleeves are wrapped on the edges, facing the center of the inner frame body, of the action plates; a side-loading assembly comprising
the outer frame body is a rectangular frame body with openings at the upper end and the lower end; the lower end of the outer frame body is fixed on the base;
The four side loading bodies are respectively fixed on four side walls of the outer frame body; the side loading body applies pressure to the acting plate;
The axial loading assembly is positioned right above the inner frame body;
the high-pressure water component comprises a fracturing pipe, a fracturing pump for supplying water to the fracturing pipe and a water pressure recorder for monitoring the water pressure in the fracturing pipe.
2. The true triaxial microbial-containing coal fracturing experimental device of claim 1, wherein: the side loading body comprises
The cylinder sleeve is fixed on the outer frame body, and a telescopic rod is arranged in the cylinder sleeve in a sliding mode;
and the contact pressing plate is fixed on the telescopic rod.
3. The true triaxial microbial-containing coal fracturing experimental device of claim 1, wherein: the side loading body comprises
The pressure stabilizing device comprises a base body, wherein a pressure stabilizing cavity is arranged in the base body, oil inlet and outlet holes are formed in the pressure stabilizing cavity, and a plurality of guide holes penetrating through the outer wall of the pressure stabilizing cavity are uniformly distributed in the pressure stabilizing cavity on the side wall facing the action plate; a cover plate is fixed on the side surface of the base body facing the action plate, a plurality of limiting holes are formed in the cover plate, the limiting holes correspond to the guide holes one to one, and the diameter of each limiting hole is smaller than that of each guide hole;
and the ejector rod is arranged in the guide hole in a sliding manner, a plurality of sealing bodies are arranged at one end of the ejector rod close to the pressure stabilizing cavity, the outer diameter of each sealing body is matched with the inner diameter of the guide hole and is larger than the inner diameter of the limiting hole, and the other end of the ejector rod penetrates through the limiting hole and extends out of the base body.
4. the true triaxial microbial-containing coal fracturing experimental device of claim 3, wherein: the distance between two adjacent ejector rods in the same horizontal plane is smaller than the thickness of the action plate.
5. the true triaxial microbial-containing coal fracturing experimental device of claim 3, wherein: the width of the pressure stabilizing cavity in the sliding direction of the ejector rod is smaller than the length of the ejector rod.
6. The true triaxial microbial-containing coal fracturing experimental device of claim 1, wherein: the axial loading assembly comprises
The loading head is fixed on a telescopic rod of the hydraulic machine, and the fracturing pipe is fixed on the loading head;
and the pressing plate is provided with a stepped hole in the middle, the diameter of the upper end of the stepped hole is larger than that of the lower end of the stepped hole, the inner diameter of the large end of the stepped hole is matched with the outer diameter of the loading head, and the inner diameter of the small end of the stepped hole is matched with the outer diameter of the fracturing pipe.
7. The true triaxial microbial-containing coal fracturing experimental device of claim 6, wherein: the fracturing pipe comprises
The connecting pipe is fixedly connected with the loading head;
One end of the insertion pipe is connected with the connecting pipe, a sealing assembly and a fixing assembly are arranged on the outer side of the insertion pipe,
The sealing assembly comprises a plurality of sealing rings, and a buffer groove is formed between every two adjacent sealing rings;
the fixed subassembly includes a plurality of cards, the card closes on the one end of connecting pipe is fixed on the outer wall of insert tube, with card position corresponding department be equipped with on the outer wall of insert tube and get the pressure hole, the outside in getting the pressure hole covers there is the flexure strip, the flexure strip with the outer wall of insert tube forms sealed chamber.
8. the true triaxial microbial-containing coal fracturing experimental device of claim 7, wherein: the elastic sheet is a polytetrafluoroethylene membrane or a polyurethane membrane.
9. The true triaxial microbial-containing coal fracturing experimental device of claim 1, wherein: guide tables are respectively arranged on the upper end face and the lower end face of the action plate, and guide grooves for accommodating the guide tables are formed in the inner wall of the through hole.
10. The true triaxial microbial-containing coal fracturing experimental device of claim 1, wherein: the elastic sleeve is a rubber sleeve.
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| CN201910763585.5A CN110552674A (en) | 2019-08-19 | 2019-08-19 | true triaxial contains microorganism coal body fracturing experimental apparatus |
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| CN201910763585.5A CN110552674A (en) | 2019-08-19 | 2019-08-19 | true triaxial contains microorganism coal body fracturing experimental apparatus |
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