CN114993836A - Visual rock plate dynamic fracture experimental device and monitoring method - Google Patents
Visual rock plate dynamic fracture experimental device and monitoring method Download PDFInfo
- Publication number
- CN114993836A CN114993836A CN202210399816.0A CN202210399816A CN114993836A CN 114993836 A CN114993836 A CN 114993836A CN 202210399816 A CN202210399816 A CN 202210399816A CN 114993836 A CN114993836 A CN 114993836A
- Authority
- CN
- China
- Prior art keywords
- sample
- experimental
- fracture
- dynamic
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000011435 rock Substances 0.000 title claims abstract description 48
- 230000000007 visual effect Effects 0.000 title claims abstract description 35
- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 239000012530 fluid Substances 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 68
- 239000011521 glass Substances 0.000 claims description 59
- 238000002474 experimental method Methods 0.000 claims description 19
- 239000005357 flat glass Substances 0.000 claims description 15
- 238000004458 analytical method Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 7
- 239000000700 radioactive tracer Substances 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000009736 wetting Methods 0.000 claims description 5
- 238000011160 research Methods 0.000 abstract description 7
- 238000003825 pressing Methods 0.000 description 23
- 238000012360 testing method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000011796 hollow space material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention provides a visual rock plate dynamic fracture experimental device and a monitoring method, wherein the device comprises an outer kettle body, an image acquisition assembly, a confining pressure loading assembly and a fluid injection pump; a sealed cylindrical space is formed in the outer kettle body, the top of the outer kettle body is arranged in a transparent manner, a sample seat for placing a sample is arranged in the cylindrical space, and a liquid injection hole is formed in the bottom of the sample seat; the image acquisition assembly is axially arranged above the outer kettle body and is used for acquiring a dynamic image of a sample in the outer kettle body in a fracture process; the confining pressure loading assembly applies loads to the sample along the X direction, the Y direction and the Z direction respectively in the same plane; the fluid injection pump is connected with the injection hole through a pipeline and is used for injecting the sample from the bottom. The method provided by the invention can be used for visually monitoring the dynamic expansion of the hydraulic fracture of the experimental sample under the real reservoir stratum crustal stress condition, so as to record the dynamic expansion process of the fracture, and provide a new method for the indoor experimental research of the hydraulic fracturing.
Description
Technical Field
The invention belongs to the technical field of oil and gas reservoir hydraulic fracturing development, and particularly relates to a visual rock plate dynamic fracture experimental device and a monitoring method.
Background
The reserves of unconventional oil and gas resources in China are huge, and hydraulic fracturing is the most common reservoir transformation process for efficiently developing the unconventional oil and gas resources at present. The large-scale volume fracturing is carried out through the horizontal well and the multistage fracturing, a large number of hydraulic fractures can be formed in an unconventional reservoir, the drainage area of the reservoir is greatly increased, and a large number of oil and gas migration channels with high flow conductivity are formed, so that the unconventional oil and gas exploitation conditions are greatly improved, and the recovery ratio is improved.
With the successful application of hydraulic fracturing in the field of unconventional oil and gas and the increasing difficulty of unconventional oil and gas exploitation year by year, higher requirements are put forward on a research method of a hydraulic fracturing fracture propagation mechanism. In order to provide powerful and reliable technical support for on-site fracturing design and construction schemes through experimental research, more visual and quantitative experimental results need to be provided on the basis of simulating the ground stress state of a real stratum in a hydraulic fracturing indoor experiment, the dynamic change of a hydraulic fracture in the experimental process cannot be accurately monitored in the traditional hydraulic fracturing experiment, the quantitative dynamic deformation parameter of the hydraulic fracture cannot be given after the experiment is finished, and the hydraulic fracture cannot be microscopically observed on the premise of not damaging a sample; therefore, it is urgently needed to develop a device capable of intuitively reflecting quantitative dynamic change parameters of the hydraulic fracture.
Disclosure of Invention
The invention mainly aims to provide a visual rock plate dynamic fracture experimental device and a monitoring method, and aims to solve the technical problem that the visual rock plate dynamic fracture experimental device in the prior art cannot visually reflect quantitative dynamic change parameters of hydraulic fractures.
In order to achieve the above object, the present invention provides a visual rock plate dynamic fracture experimental apparatus, including:
the device comprises an outer kettle body, a liquid storage tank, a liquid inlet, a liquid outlet and a liquid outlet, wherein a closed cylindrical space is formed inside the outer kettle body, the top of the outer kettle body is arranged in a transparent mode, a sample seat for placing a sample is arranged in the cylindrical space, and the bottom of the sample seat is provided with a liquid injection hole;
the image acquisition assembly is axially arranged above the outer kettle body and is used for acquiring a dynamic image of a sample in the outer kettle body in a fracture process;
the confining pressure loading assembly is used for applying loads to the sample along the X direction, the Y direction and the Z direction in the same plane respectively;
and the fluid injection pump is connected with the injection hole through a pipeline and is used for injecting the sample from the bottom.
In the embodiment of the invention, the outer kettle body comprises an outer cylinder, an upper top cover and a base plate which are arranged at the top end and the bottom end of the outer cylinder, and a glass pressing plate which is arranged on the upper top cover, wherein the center of the upper top cover is provided with a viewing window which is convenient for observing the interior of the outer kettle body, the glass pressing plate is of an annular plate-shaped structure, an installation groove for embedding window glass is formed in the inner side wall of the glass pressing plate along the circumferential direction, and the window glass coaxially covers the viewing window.
In the embodiment of the invention, the sample holder comprises a circular base plate and a sample platform arranged at the center of the circular base plate, and a plurality of rectangular grooves are symmetrically formed in the outer periphery of the circular base plate along the radial direction.
In the embodiment of the invention, the circular chassis is provided with a guide hole, the circular chassis and the base plate are coaxially arranged and are in guide connection through a guide shaft, the bottom end of the guide shaft is arranged on the base plate seat, and the top end of the guide shaft penetrates through and is locked in the guide hole.
In the embodiment of the invention, the visual rock plate dynamic fracture experimental device further comprises a glass plug, two ends of the glass plug are respectively abutted to the window glass and the sample, the glass plug, the sample and the sample platform form a rectangular cylinder together, a sealing rubber sleeve is hermetically sleeved on the outer side wall of the sample, transparent sealing pieces are hermetically arranged between the sample and the sample platform, and the sample, the transparent sealing pieces and the sample platform are consistent in shape and size.
In the embodiment of the invention, the device further comprises a staggered loading plate group arranged on the sample seat, the staggered loading plate group is a rectangular frame structure formed by enclosing and combining four staggered loading plate cards, and the inner side of the staggered loading plate group is tightly attached to the outer side wall of the sealing rubber sleeve in a sealing manner.
In an embodiment of the invention, the confining pressure loading assembly comprises two lateral confining pressure hydraulic cylinders, two vertical confining pressure hydraulic cylinders and a confining pressure pump set for driving the lateral confining pressure hydraulic cylinders and the vertical confining pressure hydraulic cylinders to act, piston rods of the lateral confining pressure hydraulic cylinders respectively penetrate through the side wall of the outer cylinder in the X direction and the Y direction in the same plane and abut against the outer side wall of the dislocation loading plate, and piston rods of the vertical confining pressure hydraulic cylinders penetrate through the base plate in the Z direction and abut against the sample holder.
In an embodiment of the present invention, a method for monitoring dynamic fracture of a visual rock plate is further provided, which is performed by using the above-mentioned experimental apparatus for dynamic fracture of a visual rock plate, and includes:
step S10: preparing an experimental sample and placing the prepared experimental sample on a sample seat;
step S20: starting a confining pressure pump set, and applying loads to the experimental sample along the X direction, the Y direction and the Z direction;
step S30: starting a fluid injection pump, injecting pre-prepared experimental fluid into the experimental sample, and simultaneously opening an image acquisition assembly to completely record the dynamic expansion of the crack in the experimental process;
step S40: and observing and analyzing the fracture form, the fracture tip form and the like after the hydraulic fracture penetrates through the experimental sample.
In an embodiment of the present invention, the step S10 includes:
step S11: placing the prepared experimental sample on a transparent sealing sheet, wherein the sizes of the experimental sample, the transparent sealing sheet and the sample table are kept consistent;
step S12: placing a transparent sealing sheet for sealing the upper surface of an experimental sample above the sample and wetting the transparent sealing sheet, and sleeving a sealing rubber sleeve outside the experimental sample and the sample table from top to bottom to complete the sealing of the experimental sample;
step S13: sleeving the staggered loading plate group on the outer side of the sealing rubber sleeve, and aligning the inner side corners of the staggered loading plate group with the outer side corners of the sealing rubber sleeve respectively;
step S14: and selecting a glass plug with the same size as the experimental sample, placing the glass plug above the sample, and embedding the lower part of the glass plug into the sealing rubber sleeve.
In an embodiment of the present invention, the step S40 includes:
intercepting an image of a sample crack from the crack initiation to the expansion to the edge of the sample, and taking the image as a dynamic record of the dynamic expansion process of the crack and analyzing the crack characteristics;
observing the microscopic form of the crack tip by using a microscope, processing the pictures shot before and after crack initiation by using a digital image technology, and analyzing the real stress and deformation characteristics of the crack tip in the crack propagation path process;
observing the influence rule of the non-homogeneity in the natural rock sample or the preset hole seam in the artificial sample on the crack propagation path by using a microscope;
the method comprises the steps of researching path and slit width changes in the dynamic crack expansion process through pixel analysis of a high-definition bitmap, and quantitatively analyzing dynamic crack expansion characteristics;
and (3) researching the flow characteristics of the fluid in the dynamic fracture propagation process by combining the tracer added into the fluid through pixel analysis of a high-definition bitmap.
Through the technical scheme, the visual rock plate dynamic fracture experimental device provided by the embodiment of the invention has the following beneficial effects:
a closed cylindrical space is formed in the outer kettle body, a sample seat for placing a sample is arranged in the cylindrical space, a liquid injection hole is formed in the bottom of the sample seat, and a fluid injection pump is connected with the liquid injection hole through a pipeline and is used for injecting the sample from the bottom; the confining pressure loading assembly applies loads to the sample along the X direction, the Y direction and the Z direction respectively in the same plane; the image acquisition assembly is axially arranged above the outer kettle body and is used for acquiring a dynamic image of a sample in the outer kettle body in a fracture process; according to the invention, the visual and intuitive monitoring of the dynamic expansion of the hydraulic fracture of the experimental sample under the real reservoir stratum ground stress condition can be realized through the image acquisition assembly, the dynamic expansion process of the fracture is recorded really, a new method is provided for the experimental research in a hydraulic fracturing chamber, and the progress of the hydraulic fracturing experiment to the refinement and visualization direction is promoted practically.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of an assembly structure of an experimental apparatus for visualizing dynamic fracture of rock plate according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a part of the structure of an experimental apparatus for visualizing the dynamic fracture of a rock plate according to an embodiment of the invention;
FIG. 3 is a schematic illustration in partial cross-sectional view of an experimental apparatus for visualizing dynamic fracture of rock slabs in an embodiment in accordance with the invention;
FIG. 4 is a schematic structural diagram of a glass pressing plate in an experimental apparatus for visualizing dynamic fracture of rock plate according to an embodiment of the invention;
FIG. 5 is a schematic structural diagram of an upper cap of the experimental apparatus for visualizing dynamic fracture of rock plate according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an outer barrel in an experimental apparatus for visualizing dynamic fracture of rock plate according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a dislocated loading plate set in an experimental apparatus for visualizing dynamic fracture of rock plates according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a sample holder of an experimental apparatus for visualizing dynamic fracture of rock formations in accordance with an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a base plate in an experimental apparatus for visualizing dynamic fracture of rock plate according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating the structure of an experimental sample in an experimental apparatus for visualizing dynamic fracture of rock formations according to an embodiment of the present invention;
FIG. 11 is a schematic illustration of the quantitative analysis of path and seam width changes during post-treatment-dynamic fracture propagation of the present invention;
FIG. 12 is a schematic representation of the effect of inhomogeneity in a post-treatment-natural rock sample on the fracture propagation path of the present invention.
Description of the reference numerals
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
The following describes a visual rock plate dynamic fracture experimental device according to the invention with reference to the attached drawings.
As shown in fig. 1 to 3, in an embodiment of the present invention, there is provided a visual rock plate dynamic fracture experimental apparatus, including:
the inner part of the outer kettle body is provided with a closed cylindrical space, the top of the outer kettle body is arranged in a transparent manner, a sample seat 10 for placing a sample 8 is arranged in the cylindrical space, and the bottom of the sample seat 10 is provided with a liquid injection hole 105;
the image acquisition assembly 24 is axially arranged above the outer kettle body and is used for acquiring a dynamic image of the sample 8 in the outer kettle body in the fracture process;
the confining pressure loading assembly is used for applying loads to the sample 8 along the X direction, the Y direction and the Z direction in the same plane respectively;
and a fluid injection pump 40 connected to the injection hole 105 through a pipe and used for injecting the sample 8 from the bottom.
In the experiment process, firstly, a prepared experimental sample 8 is placed on a sample seat 10 in an outer kettle body, fracturing fluid is injected into the sample 8 from the bottom through a pipeline of a fluid injection pump 40, and the sample can be provided with a crack to realize a guiding effect on pressing open the crack or not. The preset cracks are directly processed on the sample by the technologies of wire cutting, water jet, laser and the like when the sample is processed; meanwhile, the confining pressure loading assembly applies loads to the sample 8 in the X direction, the Y direction and the Z direction, so that the experiment sample 8 can simulate the ground stress condition of a real reservoir; in addition, the invention can realize the visual monitoring of the dynamic expansion of the hydraulic fracture of the experimental sample 8 under the real reservoir stratum ground stress condition through the image acquisition assembly 24, and really record the dynamic expansion process of the fracture, thereby providing a new method for the indoor experimental research of the hydraulic fracturing and practically promoting the progress of the hydraulic fracturing experiment to the refinement and visualization direction. Moreover, the device is reliable in design structure, can simulate the hydraulic fracturing of most unconventional reservoirs in China under the three-dimensional ground stress state and fracturing construction parameters, and develops a new idea for the combination of production and science in the field of unconventional reservoir fracturing modification.
In the embodiment of the invention, as shown in fig. 2 and fig. 6, the outer kettle body comprises an outer cylinder 7, an upper top cover 2 and a base plate 12 which are installed at the top end and the bottom end of the outer cylinder 7, and a glass pressing plate 1 which is installed on the upper top cover 2, wherein a viewing window which is convenient for observing the inside of the outer kettle body is arranged at the center of the upper top cover 2, the glass pressing plate 1 is in an annular plate-shaped structure, an installation groove 15 for embedding the viewing window glass 3 is formed in the inner side wall of the glass pressing plate 1 along the circumferential direction, and the viewing window glass 3 coaxially covers the viewing window. And a hanging ring mounting screw hole 23 is formed in the upper top cover 2 and used for mounting a hanging ring.
As shown in fig. 4 and 5, top cover connecting screw holes 14 are distributed at equal intervals on the outer edge of the glass pressing plate 1, except for being fastened and connected with the upper top cover 2 through bolts, the redundant top cover connecting screw holes 14 can be used for installing a high-speed camera support, a camera of the high-speed camera is right opposite to the window glass 3, the processes of suppressing pressure, cracking and crack expansion of the experimental sample 8 can be completely recorded, and recorded image data can be used for post-processing analysis. Meanwhile, the outer barrel 7, the upper top cover 2, the glass pressing plate 1, the window glass 3 and the base plate 12 are combined to form an inner closed cylindrical space for placing rock samples and other components for fixing, loading and sealing, the support frame 50 is installed below the base plate 12, and the high-speed camera shooting component is installed above the upper top cover 2. A plurality of glass pressing plate connecting screw holes 22 are formed in the upper top cover 2 along the circumferential direction, top cover connecting screw holes 14 are formed in the glass pressing plate 1, and bolts or screws sequentially penetrate through the glass pressing plate connecting screw holes 22 and the top cover connecting screw holes 14 to detachably connect the glass pressing plate 1 and the upper top cover 2. And, the inside of outer cauldron body is cylindrical hollow space and inside forms circular cavity 71, cuts 4 mutually perpendicular rectangle planes 73 and opens screw outside the outer cauldron body for install 4 mutually perpendicular and the piston rod all towards the pneumatic cylinder of outer cauldron body axis, 4 pneumatic cylinders are installed in same horizontal plane, can provide the loading and the uninstallation of two mutually perpendicular (X, Y) direction loads in this horizontal plane. The lower surface of the base plate 12 is provided with screw holes for mounting hydraulic cylinders with piston rods coinciding with the axis of the outer vessel, which can provide loading and unloading of loads in the direction perpendicular to the plane (Z). A plurality of foundation plate coupling screw holes 75 are formed in the bottom end wall of the outer tub 7 to couple the outer tub 7 and the foundation plate 12 by fasteners. The glass press plate 1 is provided with a second outer cylinder connecting screw hole 21 to connect the glass press plate 1 and the outer cylinder 7.
Further, as shown in fig. 9, the base plate 12 includes a base body and a base circular truncated cone 121 disposed at the center of the base body, and a piston rod hole 124 of the vertical confining pressure hydraulic cylinder 13, through which a piston rod of the vertical confining pressure hydraulic cylinder 13 passes, is disposed at the center of the base circular truncated cone 121; a plurality of first outer cylinder body connecting screw holes 125 are uniformly formed at intervals on the outer edge of the base body so as to be connected with the end wall of the outer cylinder body 7 through fasteners; a plurality of vertical confining pressure hydraulic cylinder 13 mounting screw holes 126 are further uniformly formed in the outer edge of the base circular table 121 at intervals so as to mount the cylinder barrel of the vertical confining pressure hydraulic cylinder 13 at the bottom of the base circular table 121. A liquid-filling inlet 122 is formed in the circular truncated cone 121 of the base, and a connection pipe of the fluid-filling pump 40 fills the sample 8 through the liquid-filling inlet 122.
In addition, the window glass 3 is a cylindrical transparent toughened glass plate and is embedded in the glass pressing plate 1; glass clamp plate 1 is an annular column metal sheet, sets up the window hole 16 of being convenient for observe on glass clamp plate 1, installs LED lamp area 4 in the bottom surface of glass clamp plate 1, can supply light for outer cauldron internal space in the experimentation, is convenient for observe.
In the embodiment of the present invention, as shown in fig. 8, the sample holder 10 includes a circular base plate 101 and a sample stage 104 installed at the center of the circular base plate 101, the outer periphery of the circular base plate 101 is symmetrically provided with a plurality of rectangular grooves 102 along the radial direction, and the rectangular grooves 102 are provided so as not to interfere with the movement of the hydraulic piston ram in the confining pressure loading assembly.
In the embodiment of the invention, a guide hole 103 is formed on the circular base plate 101, the circular base plate 101 and the base plate 12 are coaxially arranged and are connected in a guiding manner through a guide shaft 11, the top end of the guide shaft 11 is installed on the base plate seat, and the top end of the guide shaft 11 penetrates through and is locked in the guide hole 103.
Specifically, a rectangular experiment sample table 104 is embedded on the circular base plate 101 of the sample holder 10; the surface of the sample table 104 is flat, a plurality of sample injection holes 81 with the diameter less than 2mm are formed in the direction vertical to the upper surface, and each sample injection hole 81 can be independently opened or closed through a connector or a plug below; 4 rectangular grooves 102 are symmetrically distributed on the outer edge of the circular chassis 101, so that the mutual interference between the movement of the sample holder 10 along the Z direction and the piston movement of the hydraulic cylinder piston rod in the X and Y directions in the loading and unloading processes is avoided; the circular base plate 101 is further provided with a plurality of centrosymmetric circular guide holes 103 which are matched with the guide shafts 11 fixed on the base plate seat to ensure that the sample seat 10 does not deflect in the process of moving along the Z direction.
In the embodiment of the invention, as shown in fig. 2 and 3, the visual rock plate dynamic fracture experimental device further comprises a glass plug 5, two ends of the glass plug 5 are respectively abutted against the window glass 3 and the sample 8, the glass plug 5, the sample 8 and the sample table 104 jointly form a rectangular cylinder, and a sealing rubber sleeve is hermetically sleeved on the outer side wall of the rectangular cylinder. The glass plug 5 is a cubic transparent glass block, the upper surface of the glass plug 5 is in contact with the window glass 3, and the lower surface of the glass plug 5 is pressed above the experimental sample 8; the height of the glass plug 5 can be adjusted according to the thickness of the experimental sample 8, and the section size of the glass plug 5 is consistent with that of the experimental sample 8.
In the embodiment of the invention, transparent sealing pieces are hermetically arranged between the sample 8 and the sample table 104, and the shape and the size of the sample 8, the transparent sealing pieces and the sample table 104 are consistent.
In the embodiment of the present invention, as shown in fig. 7, the present invention further includes a staggered loading plate group 9 installed on the sample holder 10, the staggered loading plate group 9 is a rectangular frame structure formed by enclosing four staggered loading plates 91, and the inner side of the staggered loading plate group 9 is tightly sealed with the outer side wall of the sealing rubber sleeve. Wherein, dislocation loading plate 91 is an L shape metal part, and spacing pinhole 92 has been seted up to the short end of dislocation loading plate 91, and spacing groove 93 has been seted up to the long end of dislocation loading plate 91, and 4 dislocation loading plates 91 are placed respectively in 4 limits of experimental sample 8, carry on spacingly to experimental sample 8 through the cooperation of pin, spacing pinhole 92 and spacing groove 93, avoid appearing dislocation, the inhomogeneous phenomenon of atress at loading in-process experimental sample 8.
Furthermore, a glass pressing plate 1, an experimental sample 8 and a sample seat 10 are sequentially arranged in the cylindrical hollow space of the outer kettle body from top to bottom, transparent sealing pieces for sealing are arranged between the experimental sample 8 and the glass pressing plate 1 as well as between the experimental sample 8 and the sample seat 10, and the upper surface and the lower surface of the experimental sample 8 are sealed, and the visibility is ensured; a sealing rubber sleeve is placed on the outer side of a rectangular cylinder formed by the glass plug 5, the experimental sample 8 and the sample table 104 on the sample seat 10, and the inner surface of the sealing rubber sleeve is tightly attached to the outer surface of the rectangular cylinder. The externally mounted of sealing rubber sleeve has dislocation load board 91, and with the cooperation of the pneumatic cylinder piston rod of X, Y direction for experiment sample 8 applys even load, compresses tightly sealing rubber sleeve when applying load, realizes the complete sealing in experiment sample 8 place space.
In addition, the bottom of the bottom plate seat is provided with a support frame 50 with a hollow structure, so that the lower component can be conveniently operated, and the height of the support frame is greater than that of the bottom hydraulic cylinder.
In the embodiment of the present invention, the confining pressure loading assembly includes two lateral confining pressure hydraulic cylinders 6, two vertical confining pressure hydraulic cylinders 13, and a confining pressure pump set 30 for driving the lateral confining pressure hydraulic cylinders 6 and the vertical confining pressure hydraulic cylinders 13 to act, the piston rods of the lateral confining pressure hydraulic cylinders 6 respectively penetrate through the side wall of the outer cylinder 7 along the X direction and the Y direction in the same plane and abut against the outer side wall of the offset loading plate 91, and the piston rods of the vertical confining pressure hydraulic cylinders 13 penetrate through the base plate 12 along the Z direction and abut against the sample holder 10. The confining pressure pump group 30 comprises 3 three-way confining pressure loading pumps and 1 fluid injection pump 40, wherein the 3 confining pressure loading pumps are respectively connected with 4 hydraulic cylinders in the X and Y directions and 1 hydraulic cylinder in the Z direction through pipelines, and the fluid injection pump 40 is connected with a joint of the liquid injection hole 105 at the bottom of the sample holder 10 through a pipeline.
In an embodiment of the present invention, a method for monitoring dynamic fracture of a visual rock plate is further provided, which is performed by using the above visual rock plate dynamic fracture experimental apparatus, and includes:
step S10: preparing an experimental sample 8 and placing the prepared experimental sample 8 on a sample seat 10;
as shown in fig. 10, the experimental sample 8 used in the visual dynamic fracture tester is rectangular and thin sheet-shaped, the side length of the sample 8 is 50mm to 70mm, the thickness of the sample 8 is 3mm to 20mm, and the material of the sample 8 can be a downhole core, a outcrop rock sample, an artificial rock sample, or a sample 8 formed by cutting other materials, as long as the size meets the above requirements. Different rock sample sizes need to be matched with glass pressing plates 1, sample seats 10, staggered loading plates 91, sealing elements and the like with corresponding sizes. And, the sample 8 needs to be drilled with at least one sample injection hole 81 according to the experimental design, the position of the sample injection hole 81 needs to correspond to one of the injection holes 105 on the sample platform 104, so as to realize the injection of the fluid, and the position of the sample injection hole 81 can be arranged anywhere from the center to the edge of the sample 8.
Step S20: starting a confining pressure pump unit 30, and applying loads to the experimental sample 8 along the X direction, the Y direction and the Z direction;
a three-way confining pressure pump set 30 is started to apply three-way confining pressure to the experimental sample 8, so that the three-way confining pressure is kept to be loaded in a balanced manner as much as possible, and stress concentration in the experimental sample 8 before an experiment is avoided;
step S30: starting the fluid injection pump 40, injecting a pre-prepared experimental fluid into the experimental sample 8, and simultaneously opening the image acquisition assembly 24 to completely record the dynamic expansion of the crack in the experimental process;
the injection fluid used by the visual dynamic fracture tester can be any fluid of oil base and water base or a fluid mixed with proppant so as to truly simulate the fracturing process of an oil field site; in order to observe the flow characteristics of the fluid in the dynamic fracture propagation process, a color tracer can be added into the fluid for observation. The size of a test sample 8 of the visual dynamic fracture tester is small, and the designed injection displacement range is 0-20 ml/min; the confining pressure loading range is 0-20 MPa; according to a similar theory, the ground stress state and the fracturing construction parameters of most unconventional reservoirs in China can be simulated.
Step S40: after the hydraulic fracture penetrated the test sample 8, the fracture propagation path, fracture width and fracture tip morphology were observed by image processing techniques.
After the hydraulic fracture penetrated test sample 8, the test was ended. After the test is finished, the fluid injection pump 40 is closed, the high-speed camera is closed, the confining pressure pump group 30 is operated to unload, the high-speed camera frame, the glass pressing plate 1 and the top cover are detached from the upper part of the experiment frame at one time after the unloading, and the glass plug 5, the staggered loading plate 91, the sealing element and the pressed experiment sample 8 are taken out in sequence; the pressed test sample 8 was placed under a microscope, and the crack form, the crack tip form, and the like were observed and subjected to post-treatment analysis. Analyzing pixels of a high-definition bitmap, 1) researching the path and the seam width change in the dynamic crack expansion process, and quantitatively analyzing dynamic crack expansion characteristics; 2) and (3) combining the tracer agent added into the fluid to research the flow characteristics of the fluid in the process of dynamically expanding the fracture.
In an embodiment of the present invention, step S10 includes:
step S11: placing the prepared experimental sample 8 on a transparent sealing sheet, wherein the sizes of the experimental sample 8, the transparent sealing sheet and the sample table 104 are kept consistent;
step S12: placing a transparent sealing sheet for sealing the upper surface of the experimental sample 8 above the sample 8 and wetting the transparent sealing sheet, and sleeving a sealing rubber sleeve outside the experimental sample 8 and the sample table 104 from top to bottom to complete sealing of the experimental sample 8;
step S13: sleeving the staggered loading plate group 9 on the outer side of the sealing rubber sleeve, and aligning the inner side corners of the staggered loading plate group 9 with the outer side corners of the sealing rubber sleeve respectively;
step S14: and selecting a glass plug 5 with the same size as the experimental sample 8, placing the glass plug 5 above the sample 8, and embedding the lower part of the glass plug 5 into the sealing rubber sleeve.
The experimental steps of the whole visual rock plate dynamic fracture monitoring method are explained in detail as follows:
the method comprises the following steps: the three-way confining pressure loading assembly and the injection assembly of the visual dynamic fracture tester are assembled, wherein the fluid injection pump 40 is connected with the street head at the lower part of the selected injection hole 105 at the bottom of the sample holder 10 through a pipeline, and the bottoms of the other injection holes 105 are sealed by using screw plugs;
step two: placing the transparent sealing sheet on a rectangular sample table 104 of the sample holder 10, and wetting, wherein an opening is formed at a position corresponding to a liquid injection hole 105 of the sample table 104;
step three: placing the prepared sample 8 on the transparent sealing sheet, wherein the sizes of the sample 8, the transparent sealing sheet and the sample table 104 are consistent, and the opening positions of the sample 8, the transparent sealing sheet and the sample table 104 are in one-to-one correspondence, so that the smoothness of a fluid channel is guaranteed;
step four: placing a transparent sealing sheet for sealing the upper surface of an experimental sample 8 above the sample 8 and wetting the transparent sealing sheet, and sleeving a sealing rubber sleeve outside the sample 8 and the sample table 104 from top to bottom to complete the assembly of the sealing element;
step five: sleeving the staggered loading plate 91 outside the sealing rubber sleeve to ensure that the corners of the inner side of the staggered loading plate are respectively aligned with the corners of the outer side of the sealing rubber sleeve;
step six: selecting a glass plug 5 which has the same size as the experimental sample 8 and the proper height, placing the glass plug 5 above the sample 8, and ensuring that more than 10mm below the glass plug 5 is embedded into the sealing rubber sleeve;
step seven: installing a top cover and a glass pressing plate 1 embedded with window glass 3, fastening and connecting the top cover and the glass pressing plate by using bolts, installing a high-speed camera bracket and a high-speed camera through redundant screw holes on the glass pressing plate 1, enabling a camera of the high-speed camera to be opposite to the window glass 3, and opening an LED lamp belt 4 to supplement a light source;
step eight: opening a three-way confining pressure pump set 30, applying X, Y, Z three-way confining pressure to the experimental sample 8, keeping the three-way confining pressure balanced loading as much as possible, and avoiding stress concentration in the experimental sample 8 before the experiment;
step nine: starting a fluid injection pump 40, injecting pre-prepared experimental fluid, and simultaneously starting a high-speed camera to completely record the experimental process;
step ten: after the hydraulic fracture penetrated test sample 8, the test was completed. After the test is finished, the fluid injection pump 40 is closed, the high-speed camera is closed, the confining pressure pump group 30 is operated to unload, the high-speed camera frame, the glass pressing plate 1 and the top cover are dismounted from the upper part of the experiment frame at one time after the unloading, and the glass plug 5, the staggered loading plate 91, the sealing element and the pressed experiment sample 8 are taken out in sequence;
step eleven: placing the pressed experimental sample 8 under a microscope, observing crack forms, crack tip forms and the like, and performing aftertreatment analysis;
step twelve: analyzing pixels of a high-definition bitmap, 1) researching the path and the seam width change in the dynamic crack expansion process, and quantitatively analyzing dynamic crack expansion characteristics; 2) and (3) combining the tracer agent added into the fluid to research the flow characteristics of the fluid in the process of dynamically expanding the fracture.
According to the method, more visual, quantitative and dynamic parameters related to the hydraulic fracture can be obtained through the post-treatment of the visual materials, and the method comprises the following steps: 1) dynamic recording of crack propagation paths; 2) recording the quantitative dynamic change of the crack width; 3) flow characteristics of the fluid during dynamic propagation of the fracture; 4) interaction of particulate mineral and lithologic interfaces and natural fractures with hydraulic fractures; 5) the actual force and deformation characteristics of the seam point. The above parameters and data cannot be obtained by the conventional true triaxial fracturing experiment.
The requirements of the experimental sample 8 on the material and the size are relatively loose, and an experimenter can select a matching component of the experimental frame through the obtained rock sample, so that the hydraulic fracturing simulation experiment of cores with all sizes, which can be obtained on site, can be met. If the real core cannot be obtained, the experimenter can also select other materials with similar mechanical properties for experiment.
There are 5 post-processing methods for the dynamic expansion high-definition image of 8 cracks of the sample recorded by the high-speed camera:
1) intercepting an image of a sample crack from the crack initiation to the expansion to the edge of the sample 8, and taking the image as a dynamic record of the dynamic expansion process of the crack for crack characteristic analysis;
2) observing the microscopic form of the crack tip by using a microscope, and processing the pictures shot before and after crack initiation by using a digital image technology to analyze the real stress and deformation characteristics of the crack tip in the crack propagation path process;
3) as shown in fig. 12, a microscope can be used to observe the influence of the non-homogeneous or artificial sample in the natural rock sample 8 on the crack propagation path, so as to summarize the rule, and the rule is used for optimizing the hydraulic fracturing construction parameters;
4) as shown in fig. 11, the path and seam width changes in the dynamic fracture propagation process can be studied through the pixel analysis of the high-definition bitmap, and the dynamic fracture propagation characteristics can be quantitatively analyzed for the optimization of hydraulic fracturing construction parameters;
5) the flow characteristics of the fluid in the dynamic crack propagation process are researched by combining with a tracer added into the fluid through pixel analysis of a high-definition bitmap, and the method is used for optimizing hydraulic fracturing construction parameters.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The utility model provides a visual rock plate dynamic fracture experimental apparatus which characterized in that includes:
the device comprises an outer kettle body, a sample holder (10) and a liquid injection hole (105), wherein a closed cylindrical space is formed inside the outer kettle body, the top of the outer kettle body is arranged in a transparent mode, the sample holder (10) is used for holding a sample (8) and arranged in the cylindrical space, and the bottom of the sample holder (10) is provided with the liquid injection hole;
the image acquisition assembly is axially arranged above the outer kettle body and is used for acquiring a dynamic image of a sample (8) in the outer kettle body in a fracture process;
a confining pressure loading assembly for applying loads to the sample (8) along the X direction, the Y direction and the Z direction respectively in the same plane;
and a fluid injection pump (40) connected to the injection hole (105) through a pipe and used for injecting the sample (8) from the bottom.
2. The visual rock plate dynamic fracture experimental apparatus of claim 1, characterized in that, the outer cauldron body includes urceolus (7), install in last top cap (2) and bed plate (12) of urceolus (7) top and bottom and install in glass clamp plate (1) on last top cap (2), the window of looking of being convenient for observe the internal portion of outer cauldron is seted up at last top cap (2) center, glass clamp plate (1) are the annular platelike structure, just the inside wall of glass clamp plate (1) forms along circumference and is used for inlaying the mounting groove of establishing window glass (3), window glass (3) coaxial cover the window of looking.
3. The apparatus for visualizing rock slab dynamic fracture experiment as in claim 2, wherein the sample holder (10) comprises a circular bottom plate (101) and a sample stage (104) installed at the center of the circular bottom plate (101), and a plurality of rectangular grooves (102) are symmetrically formed in the radial direction on the outer periphery of the circular bottom plate (101).
4. The visual rock plate dynamic fracture experimental device according to claim 3, wherein a guide hole (103) is formed in the circular base plate (101), the circular base plate (101) and the base plate (12) are coaxially arranged and are connected in a guiding manner through a guide shaft (11), the bottom end of the guide shaft (11) is mounted on the base plate seat, and the top end of the guide shaft (11) penetrates through and is locked in the guide hole (103).
5. The visual rock plate dynamic fracture experimental device of claim 3, characterized in that, the visual rock plate dynamic fracture experimental device further comprises a glass plug (5) with two ends respectively abutted against the window glass (3) and the sample (8), the glass plug (5), the sample (8) and the sample platform (104) jointly form a rectangular cylinder, a sealing rubber sleeve is arranged on the outer side wall of the sample (8) in a sealing way, transparent sealing pieces are arranged between the sample (8) and the sample platform (104) in a sealing way, and the shape and size of the sample (8), the transparent sealing pieces and the sample platform (104) are consistent.
6. The visual rock plate dynamic fracture experimental device according to claim 5, further comprising a staggered loading plate group (9) installed on the sample seat (10), wherein the staggered loading plate group (9) is a rectangular frame structure formed by enclosing four staggered loading plates (91), and the inner side of the staggered loading plate group (9) is tightly and hermetically attached to the outer side wall of the sealing rubber sleeve.
7. The visual rock plate dynamic fracture experimental device according to claim 6, wherein the confining pressure loading assembly comprises two lateral confining pressure hydraulic cylinders (6), two vertical confining pressure hydraulic cylinders (13) and a confining pressure pump group (30) for driving the lateral confining pressure hydraulic cylinders (6) and the vertical confining pressure hydraulic cylinders (13) to act, piston rods of the lateral confining pressure hydraulic cylinders (6) penetrate through the side wall of the outer barrel (7) and abut against the outer side wall of the dislocation loading plate (91) in the X direction and the Y direction in the same plane respectively, and piston rods of the vertical confining pressure hydraulic cylinders (13) penetrate through the base plate (12) and abut against the sample seat (10) in the Z direction.
8. A visual rock plate dynamic fracture monitoring method is carried out by using the visual rock plate dynamic fracture experimental device as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
step S10: preparing an experimental sample (8) and placing the prepared experimental sample (8) on a sample seat (10);
step S20: starting a confining pressure pump group (30), and applying loads to the experimental sample (8) along the X direction, the Y direction and the Z direction;
step S30: starting a fluid injection pump, injecting pre-prepared experimental fluid into the experimental sample (8), and simultaneously opening an image acquisition assembly to completely record the dynamic expansion of the crack in the experimental process;
step S40: after the hydraulic fracture penetrates the experimental sample (8), the fracture propagation path, the fracture width and the fracture tip form are observed through an image processing technology.
9. The method for visually inspecting dynamic fracture of rock plate according to claim 8, wherein said step S10 comprises:
step S11: placing the prepared experimental sample (8) on a transparent sealing sheet, wherein the sizes of the experimental sample (8), the transparent sealing sheet and the sample table (104) are kept consistent;
step S12: placing a transparent sealing sheet for sealing the upper surface of the experimental sample (8) above the sample (8) and wetting the transparent sealing sheet, and sleeving a sealing rubber sleeve on the outer sides of the experimental sample (8) and a sample table (104) from top to bottom to complete sealing of the experimental sample (8);
step S13: sleeving the staggered loading plate group (9) on the outer side of the sealing rubber sleeve, and aligning the corners of the inner side of the staggered loading plate group (9) with the corners of the outer side of the sealing rubber sleeve respectively;
step S14: and selecting a glass plug (5) with the same size as the experimental sample (8), placing the glass plug above the sample (8), and embedding the lower part of the glass plug (5) into the sealing rubber sleeve.
10. The method for monitoring dynamic fracture of visualized rock plate according to claim 8, wherein said step S40 comprises:
intercepting an image of a sample crack from the crack initiation to the expansion to the edge of the sample, and taking the image as a dynamic record of the dynamic expansion process of the crack and analyzing the crack characteristics;
observing the microscopic form of the crack tip by using a microscope, processing the pictures shot before and after the crack is initiated by using a digital image technology, and analyzing the real stress and deformation characteristics of the crack tip in the crack propagation path process;
observing the influence rule of a non-homogeneous or preset hole seam in an artificial sample in a natural rock sample on a crack propagation path by using a microscope;
the method comprises the steps of researching the path and the seam width change in the dynamic crack expansion process through the pixel analysis of a high-definition bitmap, and quantitatively analyzing dynamic crack expansion characteristics;
and (3) researching the flow characteristics of the fluid in the dynamic fracture propagation process by combining the tracer added into the fluid through pixel analysis of a high-definition bitmap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210399816.0A CN114993836A (en) | 2022-04-15 | 2022-04-15 | Visual rock plate dynamic fracture experimental device and monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210399816.0A CN114993836A (en) | 2022-04-15 | 2022-04-15 | Visual rock plate dynamic fracture experimental device and monitoring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114993836A true CN114993836A (en) | 2022-09-02 |
Family
ID=83024181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210399816.0A Pending CN114993836A (en) | 2022-04-15 | 2022-04-15 | Visual rock plate dynamic fracture experimental device and monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114993836A (en) |
-
2022
- 2022-04-15 CN CN202210399816.0A patent/CN114993836A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10634596B2 (en) | Visualized supercritical carbon dioxide fracturing physical simulation test method | |
| CN110924933A (en) | Visual experiment method for dynamically simulating shale fracturing fracture network | |
| CN110617045A (en) | Crack initiation propagation and supporting crack stress sensitivity evaluation device and method | |
| CN108801799A (en) | Rock fracture physical simulation system and test method | |
| CN111119831B (en) | Horizontal well staged fracturing indoor simulation test device and operation method thereof | |
| CN112816389B (en) | Multidirectional multilayer full-diameter fracture core seepage simulation device and application thereof | |
| CN113281182B (en) | Multi-means integrated fracture quantitative evaluation method | |
| CN109001040B (en) | Rock fracturing simulator | |
| CN111946318B (en) | Multi-cluster synchronous fracturing visual simulation device, system and manufacturing method | |
| CN112485120B (en) | Visual energy storage fracturing physical simulation test device and test method thereof | |
| CN103868799A (en) | Rock mechanical characteristic analyzer for non-conventional oil-gas reservoir stratum | |
| CN114486532B (en) | Device and method for testing fluid migration rule in creep of ice-containing soft rock sample | |
| CN112858020A (en) | Rock triaxial confining pressure loading and seepage test device and method | |
| CN110056335B (en) | Triaxial multi-crack hydraulic fracturing experimental device and experimental method | |
| CN108732010A (en) | A kind of simulation of fracturing fracture and evaluating apparatus and method | |
| CN111103198A (en) | True triaxial hydraulic fracturing experimental device with CT real-time scanning and method | |
| CN116411959A (en) | Oil-gas well fracturing test device and method for simulating real stratum environment | |
| CN114993836A (en) | Visual rock plate dynamic fracture experimental device and monitoring method | |
| CN113484153A (en) | Indoor true triaxial hydrofracturing ground stress test simulation method and device | |
| CN115370341B (en) | Microcosmic visual rock plate hydraulic fracturing indoor simulation method and device | |
| CN113295537B (en) | Test method for unconventional reservoir fracturing fracture seepage capability evaluation | |
| KR101814019B1 (en) | Current Hydraulic Fracturing System for Applying Differential Stress | |
| CN109374415A (en) | A kind of multiple cracking three-dimensional space induced stress test method | |
| LU102934B1 (en) | A Large-scale True Triaxial Hydraulic Fracturing Experimental Device with Temperature Control System and Its Experimental Method | |
| CN208921549U (en) | Stress test rock core clamps simulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |