CN110984942A - Visual experimental apparatus of dynamic simulation shale fracturing fracture net - Google Patents
Visual experimental apparatus of dynamic simulation shale fracturing fracture net Download PDFInfo
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- 230000000007 visual effect Effects 0.000 title claims abstract description 235
- 238000005094 computer simulation Methods 0.000 title claims description 4
- 239000012530 fluid Substances 0.000 claims abstract description 82
- 239000011435 rock Substances 0.000 claims abstract description 63
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 238000004088 simulation Methods 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims description 102
- 238000007789 sealing Methods 0.000 claims description 48
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- 238000005457 optimization Methods 0.000 abstract description 6
- 230000001133 acceleration Effects 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 description 27
- 208000010392 Bone Fractures Diseases 0.000 description 26
- 239000007789 gas Substances 0.000 description 17
- 238000002474 experimental method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000000977 initiatory effect Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000002591 computed tomography Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 230000004660 morphological change Effects 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012800 visualization Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
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- 239000003795 chemical substances by application Substances 0.000 description 1
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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Abstract
The invention discloses a visual experimental device for dynamically simulating a shale fracturing network, which belongs to the technical field of yield increase transformation of unconventional oil and gas reservoirs, comprises a visual simulation shale rock sample, a comprehensive control console and a high-definition video camera, and is characterized in that: the device comprises a visual simulated shale rock sample and a visual fracturing cavity, and is characterized by further comprising a visual fracturing cavity, a first constant-speed constant-pressure pump, a second constant-speed constant-pressure pump, a hydraulic chamber, a multistage fluid injection end, a simulated shaft and a fluid collection tank, wherein the visual simulated shale rock sample and the visual fracturing cavity are connected with an outlet of the multistage fluid injection end through the simulated shaft, the visual fracturing cavity and the multistage fluid injection end are connected with the first constant-speed constant-pressure pump, and the hydraulic chamber is connected with the second constant-speed constant-pressure pump. The method meets the quantitative requirements on the fracture morphology under different fracturing modes and construction parameter conditions, and the simulation result can be used for guiding the design optimization of the fracturing scheme, the decision adjustment of field construction and the quantitative evaluation after fracturing, thereby having important significance on the high-quality development and acceleration and synergy of shale gas.
Description
Technical Field
The invention relates to the technical field of yield increase transformation of unconventional oil and gas reservoirs, in particular to a visual experimental device for dynamically simulating a shale fracturing network.
Background
Natural gas is the cleanest energy in the world at present, and natural gas resources in China are abundant, particularly shale gas resources. The efficient development of the shale gas not only effectively relieves the situation that the supply of clean natural gas energy is in short supply in China, but also greatly reduces the external dependence of the energy in China. At present, the development process of shale gas in China has been long for years, slick water, large-scale, large-displacement, horizontal well staged fracturing and the like are main technologies for shale gas development, but the key problems that how to accurately and effectively evaluate different fracturing modes, such as single-well fracturing, multi-well zippers, multi-well synchronization, fine influence of construction parameters, such as displacement intervals, perforation parameters, liquid performance and the like, on formed artificial cracks and how to effectively and accurately diagnose the fracturing cracks still restrict the efficient and fine development of shale gas in south China at present are solved. Therefore, the development of fracture mode evaluation and fracture network diagnosis research based on fracture visualization under laboratory conditions has important significance for optimizing fracturing scheme design, improving field measures and pertinently guiding quantitative evaluation after fracturing.
At present, three main methods are available for the visual research of fracturing fractures in laboratories: firstly, applying curable fracturing fluid to perform fracturing simulation, and taking out cured fracturing cracks after the experiment is finished; secondly, the CT scanning is applied to construct the crack form, the CT scanning is carried out on the rock sample before and after the experiment, and the crack form is constructed by applying the scanning result; and thirdly, constructing a fractured fracture form by applying nuclear magnetic resonance imaging, namely performing white oil saturation on the fractured rock sample, and then performing nuclear magnetic resonance imaging to show the fractured fracture form saturated by the white oil.
The conventional methods or techniques represented by the above methods still have the following drawbacks or disadvantages:
1. the fracturing fluid in the first method has high viscosity due to the addition of the curing agent, and the influence of low-viscosity fluids such as slickwater on the fracture form is difficult to simulate; in addition, the cured cracks are difficult to take out of the rock mass, and part of small cracks are easy to damage and lose;
2. the second method has the main defects that the sample is limited by the CT scanning size, the CT scanning surfaces have large quantity, radiation exists, and the crack precision is influenced by the number of the scanning surfaces;
3. the third method has the main defects that new cracks can be generated in the process of saturating the white oil, the evaluation precision is influenced, the cost is high, and the popularization is not facilitated.
Chinese patent publication No. CN 102590456a, published 2012/07/18 discloses a device for simulating volume fracturing of a horizontal well of a shale reservoir, which is characterized by comprising a simulated reservoir cavity, a data acquisition control panel, a computer, and a horizontal wellbore arranged in the simulated reservoir cavity, wherein the data acquisition control panel is connected with the computer; the simulated reservoir cavity comprises an upper cover and a rectangular cavity, and the upper cover is hermetically arranged on the rectangular cavity through a bolt; a plurality of liquid inlet holes are arranged on one side wall of the simulated reservoir cavity in a penetrating manner, the liquid inlet holes are arranged on one side wall of the simulated reservoir cavity in the same horizontal straight line, the horizontal shaft penetrates through one of the liquid inlet holes to be arranged in the simulated reservoir cavity, and the rest of the liquid inlet holes are blocked for later use; perforating holes are arranged on the wall of the horizontal shaft in a segmented and spaced mode, one end of the horizontal shaft is a liquid inlet, and the other end of the horizontal shaft is closed; a plurality of supply source pipes are arranged on the inner wall of the simulation reservoir cavity, the supply source pipes are all connected with a supply source liquid inlet arranged on the outer wall of the simulation reservoir cavity, a valve is arranged at the supply source liquid inlet, and holes are uniformly arranged on the supply source pipes; filling a medium in the simulated reservoir cavity; three layers of pressure sensors are distributed in the upper, middle and lower parts of the simulated reservoir cavity, and 30-40 pressure sensors are uniformly distributed in each layer; each pressure sensor is connected with the data acquisition control panel through a cable; the device also comprises a liquid storage tank and a gas tank, wherein a heating sleeve is arranged outside the liquid storage tank, a temperature sensor is arranged on the heating sleeve, the temperature sensor is connected with a data acquisition control panel, a discharge port of the liquid storage tank is connected with a pipeline through a plunger pump, a flow meter and a pressure gauge are arranged on the pipeline, and the flow meter and the pressure gauge are respectively connected with the data acquisition control panel; the gas outlet of the gas tank is connected with a gas pipeline, a gas flowmeter is arranged on the gas pipeline, and the gas flowmeter is connected with a data acquisition control panel; when the simulated shale reservoir fracturing fracture is expanded, a valve at the liquid inlet of the supply source is closed, and the liquid storage tank is communicated with a liquid inlet of the horizontal shaft through a pipeline.
The device for simulating the volume fracturing of the horizontal well of the shale reservoir disclosed by the patent document simulates the initiation and extension processes of a volume fracturing fracture according to a similarity criterion, measures the density and volume of a fracture network, researches the influence of fracture parameters on the fracturing capacity of the horizontal well of the shale reservoir, optimizes fracturing construction parameters and fracture parameters, and solves the problem of the fracturing of the shale reservoir. However, the method cannot meet the quantitative requirements of fracture morphology under different fracturing modes and construction parameter conditions, the accuracy of the simulation result is poor, and the method cannot be effectively used for guiding the design optimization and post-fracturing quantitative evaluation of the fracturing scheme.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a visual experiment device for dynamically simulating a shale fracturing fracture network, which can simulate the morphological changes of fracture initiation, expansion and extension of shale in the hydraulic fracturing process, meets the quantitative requirements of fracture morphology under different fracturing modes and construction parameter conditions, can be used for guiding the design optimization of a fracturing scheme, the decision adjustment of field construction and the quantitative evaluation after fracturing, and has important significance for the high-quality development, speed improvement and efficiency improvement of shale gas.
The invention is realized by the following technical scheme:
the utility model provides a visual experimental apparatus of dynamic simulation shale fracturing network, includes visual simulation shale rock specimen, synthesizes control cabinet and high definition and shoots with the video-corder, and the high definition shoots with the video-corder and is connected its characterized in that with synthesizing the control cabinet electricity: the hydraulic fracturing device is characterized by further comprising a visual fracturing cavity, a first constant-speed constant-pressure pump, a second constant-speed constant-pressure pump, a hydraulic chamber, a multi-stage fluid injection end, a simulation shaft and a liquid collecting tank, wherein coordinate scales are arranged on the visual fracturing cavity, the visual fracturing cavity is connected with the liquid collecting tank, a visual simulation shale rock sample is arranged in the visual fracturing cavity, a triaxial hydraulic power end of the visual fracturing cavity is connected with the hydraulic chamber respectively, the visual simulation shale rock sample and the visual fracturing cavity are connected with an outlet of the multi-stage fluid injection end through the simulation shaft respectively, the visual fracturing cavity and the multi-stage fluid injection end are connected with the first constant-pressure pump respectively, the hydraulic chamber is connected with the second constant-speed constant-pressure pump respectively, and the first constant-pressure pump and the second constant-pressure pump are connected with an integrated control console through control circuits.
The visual fracturing cavity is connected with a first constant-speed constant-pressure pump through a first pipeline, and a first pressure gauge and a first switch valve are arranged on the first pipeline.
Visual fracturing cavity includes first visual side board, visual top panel, first hydraulic pressure side board, first sealed piston, second hydraulic pressure side board, the sealed piston of second, third hydraulic pressure side board, the visual side board of third sealed piston and second, it has central punchhole to open on the first visual side board, punchhole under the right side, punchhole under the left side, punchhole and the hole on the left side, first hydraulic pressure side board is through the drive of first sealed piston, the drive of second hydraulic pressure side board through the sealed piston of second, the drive of third hydraulic pressure side board through the sealed piston of third.
The multistage fluid injection end comprises a low-viscosity fluid intermediate container, a medium-viscosity fluid intermediate container and a high-viscosity fluid intermediate container, the low-viscosity fluid intermediate container is connected with a first constant-speed constant-pressure pump through a second pipeline, a second switch valve is arranged on the second pipeline, the medium-viscosity fluid intermediate container is connected with the first constant-speed constant-pressure pump through a third pipeline, a third switch valve is arranged on the third pipeline, the high-viscosity fluid intermediate container is connected with the first constant-speed constant-pressure pump through a fourth pipeline, and a fourth switch valve is arranged on the fourth pipeline.
The visual fracturing cavity is connected with the liquid collecting tank through a fifth pipeline, and a second pressure gauge and a fifth switch valve are arranged on the fifth pipeline.
The hydraulic chamber comprises a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder, wherein the inlet end of the first hydraulic cylinder is connected with a second constant-speed constant-pressure pump through a first liquid inlet pipeline, the outlet end of the first hydraulic cylinder is connected with a second hydraulic side panel through a first liquid outlet pipeline, a third pressure gauge and a sixth switch valve are arranged on the first liquid outlet pipeline, a seventh switch valve is arranged on the first liquid inlet pipeline, the inlet end of the second hydraulic cylinder is connected with the second constant-speed constant-pressure pump through a second liquid inlet pipeline, the outlet end of the second hydraulic cylinder is connected with the first hydraulic side panel through a second liquid outlet pipeline, an eighth switch valve is arranged on the second liquid inlet pipeline, a fourth pressure gauge and a tenth switch valve are arranged on the second liquid outlet pipeline, the inlet end of the third hydraulic cylinder is connected with the second constant-speed constant-pressure pump through a third liquid inlet pipeline, and the outlet end of the third hydraulic cylinder is connected with a third hydraulic side panel through a third liquid, and a ninth switch valve is arranged on the third liquid inlet pipeline, and a fifth pressure gauge and an eleventh switch valve are arranged on the third liquid outlet pipeline.
The visual simulation shale rock sample is internally provided with a central open hole shaft, a right lower open hole shaft, a left lower open hole shaft, a right upper open hole shaft and a left upper open hole shaft, the central open hole shaft corresponds to a central hole on the first visual side panel, the right lower open hole shaft corresponds to a right lower hole on the first visual side panel, the left lower open hole shaft corresponds to a left lower hole on the first visual side panel, the right upper open hole shaft corresponds to a right upper hole on the first visual side panel, and the left upper open hole shaft corresponds to a left upper hole on the first visual side panel.
The pumping range of the first constant-speed constant-pressure pump is 0-30MPa, the error is less than 0.01MPa, the flow of the first constant-speed constant-pressure pump is 0-20ml/min, and the error is less than 0.01 ml/min; the pumping range of the second constant-speed constant-pressure pump is 0-30MPa, the error is less than 0.01MPa, the flow of the second constant-speed constant-pressure pump is 0-20ml/min, and the error is less than 0.01 ml/min.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the invention relates to a visual fracturing cavity, which is provided with coordinate scales, the visual fracturing cavity is connected with a liquid collecting tank, a visual simulated shale rock sample is arranged in the visual fracturing cavity, a triaxial hydraulic power end of the visual fracturing cavity is respectively connected with a hydraulic chamber, the visual simulated shale rock sample and the visual fracturing cavity are both connected with an outlet of a multistage fluid injection end through a simulated shaft, the visual fracturing cavity and the multistage fluid injection end are both connected with a first constant-speed constant-pressure pump, the hydraulic chamber is connected with a second constant-speed constant-pressure pump, the first constant-speed constant-pressure pump and the second constant-speed constant-pressure pump are both connected with a comprehensive control console through control circuits, compared with the prior art, the visual fracturing cavity can simulate the morphological changes of fracture initiation, expansion and extension of shale in the hydraulic fracturing process, and meet the quantitative requirements of the fracture morphology under different fracturing modes and construction parameter conditions, the simulation result can be used for guiding the design optimization of the fracturing scheme, the decision adjustment of field construction and the quantitative evaluation after fracturing, and has important significance for the high-quality development and acceleration and synergy of the shale gas.
2. According to the invention, through simulating the visual simulation shale rock sample and the visual fracturing cavity, the dynamic monitoring and observation of the whole process of fracture initiation, expansion and extension are really realized, the simulation result is vivid and concrete, the fracture form is visual, and the dynamic quantification, description and evaluation can be realized according to the coordinate grid.
3. The invention can be used for simulating visual simulation of shale rock samples and other rock samples according to requirements, and only needs to measure the mechanical parameters of artificial rock samples in advance, thereby having certain universality.
4. The invention discloses a visual fracturing cavity which comprises a first visual side panel, a visual upper panel, a first hydraulic side panel, a first sealing piston, a second hydraulic side panel, a second sealing piston, a third hydraulic side panel, a third sealing piston and a second visual side panel, wherein the first visual side panel is provided with a central hole, a right lower hole, a left lower hole, a right upper hole and a left upper hole, the first hydraulic side panel is driven by the first sealing piston, the second hydraulic side panel is driven by the second sealing piston, and the third hydraulic side panel is driven by the third sealing piston.
5. The invention has the advantages of reasonable structure, reliable principle, convenient use, no potential safety hazard, low experimental cost, repeatability and good popularization.
6. The invention can simulate a single-well fracturing mode, a multi-well zipper mode and a multi-well synchronous mode, can simulate slight changes of fracture shapes under different displacement intervals, perforation parameters and liquid performance conditions, and has good universality.
Drawings
The invention will be further described in detail with reference to the drawings and the detailed description, wherein:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of a visualization fracture cavity of the present invention;
FIG. 3 is a side view of a visualization fracture cavity of the present invention;
FIG. 4 is a schematic structural diagram of a visual simulation of a shale rock sample in accordance with the present invention;
the labels in the figure are: 1. visual simulation shale rock sample, 2, a comprehensive console, 3, a high-definition video camera, 4, a visual fracturing cavity, 5, a first constant-speed constant-pressure pump, 6, a second constant-speed constant-pressure pump, 7, a hydraulic chamber, 8, a liquid collecting tank, 9, a simulation shaft, 10, a first pressure gauge, 11, a first switch valve, 12, a first visual side panel, 13, a visual upper panel, 14, a first hydraulic side panel, 15, a first sealing piston, 16, a second hydraulic side panel, 17, a second sealing piston, 18, a third hydraulic side panel, 19, a third sealing piston, 20, a second visual side panel, 21, a central hole, 22, a right lower hole, 23, a left lower hole, 24, a right upper hole, 25, a left upper hole, 26, a low-viscosity fluid intermediate container, 27, a medium-viscosity fluid intermediate container, 28, a high-viscosity fluid intermediate container, 29, a second switch valve, 30. the third switch valve 31, the fourth switch valve 32, the second pressure gauge 33, the fifth switch valve 34, the first hydraulic cylinder 35, the second hydraulic cylinder 36, the third hydraulic cylinder 37, the third pressure gauge 38, the sixth switch valve 39, the seventh switch valve 40, the eighth switch valve 41, the fourth pressure gauge 42, the tenth switch valve 43, the ninth switch valve 44, the fifth pressure gauge 45, the eleventh switch valve 46, the central open hole shaft 47, the right lower open hole shaft 48, the left lower open hole shaft 49, the right upper open hole shaft 50 and the left upper open hole shaft.
Detailed Description
Example 1
Referring to fig. 1 and 4, a visual experiment device for dynamically simulating a shale fracturing network comprises a visual simulated shale rock sample 1, a comprehensive control console 2 and a high-definition camera 3, wherein the high-definition camera 3 is electrically connected with the comprehensive control console 2, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, a first constant-speed constant-pressure pump 5, a second constant-speed constant-pressure pump 6, a hydraulic chamber 7, a multi-stage fluid injection end, a simulated shaft 9 and a liquid collection tank 8, coordinate scales are arranged on the visual fractured cavity 4, the visual fractured cavity 4 is connected with the liquid collection tank 8, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, three-shaft hydraulic power ends of the visual fractured cavity 4 are respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fractured cavity 4 are both connected with an outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual simulated shale rock sample 4 and the multi-stage fluid injection end are both connected with the first constant-speed, the hydraulic chamber 7 is connected with the second constant-speed constant-pressure pump 6, and the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are connected with the integrated control console 2 through control circuits.
The visual fracturing cavity 4 is provided with coordinate scales, the visual fracturing cavity 4 is connected with the liquid collecting tank 8, the visual simulated shale rock sample 1 is arranged in the visual fracturing cavity 4, the three-axis hydraulic power end of the visual fracturing cavity 4 is respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fracturing cavity 4 are both connected with the outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual fracturing cavity 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-pressure pump 5, the hydraulic chamber 7 is both connected with the second constant-speed constant-pressure pump 6, the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are both connected with the comprehensive control console 2 through control circuits, compared with the prior art, the invention can simulate the morphological change of crack initiation, expansion and extension of shale in the hydraulic fracturing process, and meet the quantitative requirements of crack morphology under different fracturing modes and construction parameter conditions, the simulation result can be used for guiding the design optimization of the fracturing scheme, the decision adjustment of field construction and the quantitative evaluation after fracturing, and has important significance for the high-quality development and acceleration and synergy of the shale gas.
Example 2
Referring to fig. 1-4, a visual experiment device for dynamically simulating a shale fracturing network comprises a visual simulated shale rock sample 1, a comprehensive console 2 and a high-definition camera 3, wherein the high-definition camera 3 is electrically connected with the comprehensive console 2, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, a first constant-speed constant-pressure pump 5, a second constant-speed constant-pressure pump 6, a hydraulic chamber 7, a multi-stage fluid injection end, a simulated shaft 9 and a liquid collection tank 8, coordinate scales are arranged on the visual fractured cavity 4, the visual fractured cavity 4 is connected with the liquid collection tank 8, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, three-axis hydraulic power ends of the visual fractured cavity 4 are respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fractured cavity 4 are both connected with an outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual simulated shale rock sample 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-, the hydraulic chamber 7 is connected with the second constant-speed constant-pressure pump 6, and the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are connected with the integrated control console 2 through control circuits.
The visual fracturing cavity 4 is connected with a first constant-speed constant-pressure pump 5 through a first pipeline, and a first pressure gauge 10 and a first switch valve 11 are arranged on the first pipeline.
The visual fracturing cavity 4 comprises a first visual side panel 12, a visual upper panel 13, a first hydraulic side panel 14, a first sealing piston 15, a second hydraulic side panel 16, a second sealing piston 17, a third hydraulic side panel 18, a third sealing piston 19 and a second visual side panel 20, wherein the first visual side panel 12 is provided with a central hole 21, a right lower hole 22, a left lower hole 23, a right upper hole 24 and a left upper hole 25, the first hydraulic side panel 14 is driven by the first sealing piston 15, the second hydraulic side panel 16 is driven by the second sealing piston 17, and the third hydraulic side panel 18 is driven by the third sealing piston 19.
Through simulating the visual simulation shale rock sample 1 and the visual fracturing cavity 4, the dynamic monitoring and observation of the whole process of fracture initiation, expansion and extension are really realized, the simulation result is vivid and concrete, the fracture form is visual, and the dynamic quantification, description and evaluation can be realized according to a coordinate grid.
Example 3
Referring to fig. 1-4, a visual experiment device for dynamically simulating a shale fracturing network comprises a visual simulated shale rock sample 1, a comprehensive console 2 and a high-definition camera 3, wherein the high-definition camera 3 is electrically connected with the comprehensive console 2, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, a first constant-speed constant-pressure pump 5, a second constant-speed constant-pressure pump 6, a hydraulic chamber 7, a multi-stage fluid injection end, a simulated shaft 9 and a liquid collection tank 8, coordinate scales are arranged on the visual fractured cavity 4, the visual fractured cavity 4 is connected with the liquid collection tank 8, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, three-axis hydraulic power ends of the visual fractured cavity 4 are respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fractured cavity 4 are both connected with an outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual simulated shale rock sample 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-, the hydraulic chamber 7 is connected with the second constant-speed constant-pressure pump 6, and the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are connected with the integrated control console 2 through control circuits.
The visual fracturing cavity 4 is connected with a first constant-speed constant-pressure pump 5 through a first pipeline, and a first pressure gauge 10 and a first switch valve 11 are arranged on the first pipeline.
The visual fracturing cavity 4 comprises a first visual side panel 12, a visual upper panel 13, a first hydraulic side panel 14, a first sealing piston 15, a second hydraulic side panel 16, a second sealing piston 17, a third hydraulic side panel 18, a third sealing piston 19 and a second visual side panel 20, wherein the first visual side panel 12 is provided with a central hole 21, a right lower hole 22, a left lower hole 23, a right upper hole 24 and a left upper hole 25, the first hydraulic side panel 14 is driven by the first sealing piston 15, the second hydraulic side panel 16 is driven by the second sealing piston 17, and the third hydraulic side panel 18 is driven by the third sealing piston 19.
The multistage fluid injection end comprises a low-viscosity fluid intermediate container 26, a medium-viscosity fluid intermediate container 27 and a high-viscosity fluid intermediate container 28, the low-viscosity fluid intermediate container 26 is connected with the first constant-speed constant-pressure pump 5 through a second pipeline, a second switching valve 29 is arranged on the second pipeline, the medium-viscosity fluid intermediate container 27 is connected with the first constant-speed constant-pressure pump 5 through a third pipeline, a third switching valve 30 is arranged on the third pipeline, the high-viscosity fluid intermediate container 28 is connected with the first constant-speed constant-pressure pump 5 through a fourth pipeline, and a fourth switching valve 31 is arranged on the fourth pipeline.
The visual fracturing cavity 4 is connected with the liquid collecting tank 8 through a fifth pipeline, and a second pressure gauge 32 and a fifth switch valve 33 are arranged on the fifth pipeline.
The simulation device can be used for simulating the visual simulation of the shale rock sample 1 and simulating other rock samples according to needs, and only needs to determine mechanical parameters of artificial rock samples in advance, so that the simulation device has certain universality.
Example 4
Referring to fig. 1-4, a visual experiment device for dynamically simulating a shale fracturing network comprises a visual simulated shale rock sample 1, a comprehensive console 2 and a high-definition camera 3, wherein the high-definition camera 3 is electrically connected with the comprehensive console 2, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, a first constant-speed constant-pressure pump 5, a second constant-speed constant-pressure pump 6, a hydraulic chamber 7, a multi-stage fluid injection end, a simulated shaft 9 and a liquid collection tank 8, coordinate scales are arranged on the visual fractured cavity 4, the visual fractured cavity 4 is connected with the liquid collection tank 8, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, three-axis hydraulic power ends of the visual fractured cavity 4 are respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fractured cavity 4 are both connected with an outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual simulated shale rock sample 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-, the hydraulic chamber 7 is connected with the second constant-speed constant-pressure pump 6, and the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are connected with the integrated control console 2 through control circuits.
The visual fracturing cavity 4 is connected with a first constant-speed constant-pressure pump 5 through a first pipeline, and a first pressure gauge 10 and a first switch valve 11 are arranged on the first pipeline.
The visual fracturing cavity 4 comprises a first visual side panel 12, a visual upper panel 13, a first hydraulic side panel 14, a first sealing piston 15, a second hydraulic side panel 16, a second sealing piston 17, a third hydraulic side panel 18, a third sealing piston 19 and a second visual side panel 20, wherein the first visual side panel 12 is provided with a central hole 21, a right lower hole 22, a left lower hole 23, a right upper hole 24 and a left upper hole 25, the first hydraulic side panel 14 is driven by the first sealing piston 15, the second hydraulic side panel 16 is driven by the second sealing piston 17, and the third hydraulic side panel 18 is driven by the third sealing piston 19.
The multistage fluid injection end comprises a low-viscosity fluid intermediate container 26, a medium-viscosity fluid intermediate container 27 and a high-viscosity fluid intermediate container 28, the low-viscosity fluid intermediate container 26 is connected with the first constant-speed constant-pressure pump 5 through a second pipeline, a second switching valve 29 is arranged on the second pipeline, the medium-viscosity fluid intermediate container 27 is connected with the first constant-speed constant-pressure pump 5 through a third pipeline, a third switching valve 30 is arranged on the third pipeline, the high-viscosity fluid intermediate container 28 is connected with the first constant-speed constant-pressure pump 5 through a fourth pipeline, and a fourth switching valve 31 is arranged on the fourth pipeline.
The visual fracturing cavity 4 is connected with the liquid collecting tank 8 through a fifth pipeline, and a second pressure gauge 32 and a fifth switch valve 33 are arranged on the fifth pipeline.
The hydraulic chamber 7 comprises a first hydraulic cylinder 34, a second hydraulic cylinder 35 and a third hydraulic cylinder 36, the inlet end of the first hydraulic cylinder 34 is connected with a second constant-speed constant-pressure pump 6 through a first liquid inlet pipeline, the outlet end of the first hydraulic cylinder 34 is connected with a second hydraulic side panel 16 through a first liquid outlet pipeline, the first liquid outlet pipeline is provided with a third pressure gauge 37 and a sixth switch valve 38, the first liquid inlet pipeline is provided with a seventh switch valve 39, the inlet end of the second hydraulic cylinder 35 is connected with the second constant-speed constant-pressure pump 6 through a second liquid inlet pipeline, the outlet end of the second hydraulic cylinder 35 is connected with the first hydraulic side panel 14 through a second liquid outlet pipeline, the second liquid inlet pipeline is provided with an eighth switch valve 40, the second liquid outlet pipeline is provided with a fourth pressure gauge 41 and a tenth switch valve 42, the inlet end of the third hydraulic cylinder 36 is connected with the second constant-speed constant-pressure pump 6 through a third liquid inlet pipeline, the outlet end of the third hydraulic cylinder 36 is connected to the third hydraulic side panel 18 through a third liquid outlet line, a ninth switch valve 43 is disposed on the third liquid inlet line, and a fifth pressure gauge 44 and an eleventh switch valve 45 are disposed on the third liquid outlet line.
The visual fracturing cavity 4 comprises a first visual side panel 12, a visual upper panel 13, a first hydraulic side panel 14, a first sealing piston 15, a second hydraulic side panel 16, a second sealing piston 17, a third hydraulic side panel 18, a third sealing piston 19 and a second visual side panel 20, open on first visual side board 12 has central eyelet 21, eyelet 22 down in the right side, eyelet 23 down in the left side, eyelet 24 and eyelet 25 up in the left side, first hydraulic pressure side board 14 is through the drive of first sealed piston 15, second hydraulic pressure side board 16 is through the drive of second sealed piston 17, third hydraulic pressure side board 18 is through the drive of third sealed piston 19, compared with prior art, adopt whole hydraulic pressure side board as the bearing plate, hydraulic oil directly acts on hydraulic pressure side board through sealed piston, make visual simulation shale rock specimen 1 atress more even, the loading is more steady.
Example 5
Referring to fig. 1-4, a visual experiment device for dynamically simulating a shale fracturing network comprises a visual simulated shale rock sample 1, a comprehensive console 2 and a high-definition camera 3, wherein the high-definition camera 3 is electrically connected with the comprehensive console 2, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, a first constant-speed constant-pressure pump 5, a second constant-speed constant-pressure pump 6, a hydraulic chamber 7, a multi-stage fluid injection end, a simulated shaft 9 and a liquid collection tank 8, coordinate scales are arranged on the visual fractured cavity 4, the visual fractured cavity 4 is connected with the liquid collection tank 8, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, three-axis hydraulic power ends of the visual fractured cavity 4 are respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fractured cavity 4 are both connected with an outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual simulated shale rock sample 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-, the hydraulic chamber 7 is connected with the second constant-speed constant-pressure pump 6, and the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are connected with the integrated control console 2 through control circuits.
The visual fracturing cavity 4 is connected with a first constant-speed constant-pressure pump 5 through a first pipeline, and a first pressure gauge 10 and a first switch valve 11 are arranged on the first pipeline.
The visual fracturing cavity 4 comprises a first visual side panel 12, a visual upper panel 13, a first hydraulic side panel 14, a first sealing piston 15, a second hydraulic side panel 16, a second sealing piston 17, a third hydraulic side panel 18, a third sealing piston 19 and a second visual side panel 20, wherein the first visual side panel 12 is provided with a central hole 21, a right lower hole 22, a left lower hole 23, a right upper hole 24 and a left upper hole 25, the first hydraulic side panel 14 is driven by the first sealing piston 15, the second hydraulic side panel 16 is driven by the second sealing piston 17, and the third hydraulic side panel 18 is driven by the third sealing piston 19.
The multistage fluid injection end comprises a low-viscosity fluid intermediate container 26, a medium-viscosity fluid intermediate container 27 and a high-viscosity fluid intermediate container 28, the low-viscosity fluid intermediate container 26 is connected with the first constant-speed constant-pressure pump 5 through a second pipeline, a second switching valve 29 is arranged on the second pipeline, the medium-viscosity fluid intermediate container 27 is connected with the first constant-speed constant-pressure pump 5 through a third pipeline, a third switching valve 30 is arranged on the third pipeline, the high-viscosity fluid intermediate container 28 is connected with the first constant-speed constant-pressure pump 5 through a fourth pipeline, and a fourth switching valve 31 is arranged on the fourth pipeline.
The visual fracturing cavity 4 is connected with the liquid collecting tank 8 through a fifth pipeline, and a second pressure gauge 32 and a fifth switch valve 33 are arranged on the fifth pipeline.
The hydraulic chamber 7 comprises a first hydraulic cylinder 34, a second hydraulic cylinder 35 and a third hydraulic cylinder 36, the inlet end of the first hydraulic cylinder 34 is connected with a second constant-speed constant-pressure pump 6 through a first liquid inlet pipeline, the outlet end of the first hydraulic cylinder 34 is connected with a second hydraulic side panel 16 through a first liquid outlet pipeline, the first liquid outlet pipeline is provided with a third pressure gauge 37 and a sixth switch valve 38, the first liquid inlet pipeline is provided with a seventh switch valve 39, the inlet end of the second hydraulic cylinder 35 is connected with the second constant-speed constant-pressure pump 6 through a second liquid inlet pipeline, the outlet end of the second hydraulic cylinder 35 is connected with the first hydraulic side panel 14 through a second liquid outlet pipeline, the second liquid inlet pipeline is provided with an eighth switch valve 40, the second liquid outlet pipeline is provided with a fourth pressure gauge 41 and a tenth switch valve 42, the inlet end of the third hydraulic cylinder 36 is connected with the second constant-speed constant-pressure pump 6 through a third liquid inlet pipeline, the outlet end of the third hydraulic cylinder 36 is connected to the third hydraulic side panel 18 through a third liquid outlet line, a ninth switch valve 43 is disposed on the third liquid inlet line, and a fifth pressure gauge 44 and an eleventh switch valve 45 are disposed on the third liquid outlet line.
The visual simulation shale rock sample 1 is internally provided with a central open hole shaft 46, a right lower open hole shaft 47, a left lower open hole shaft 48, a right upper open hole shaft 49 and a left upper open hole shaft 50, the central open hole shaft 46 corresponds to a central hole 21 on the first visual side panel 12, the right lower open hole shaft 47 corresponds to a right lower hole 22 on the first visual side panel 12, the left lower open hole shaft 48 corresponds to a left lower hole 23 on the first visual side panel 12, the right upper open hole shaft 49 corresponds to a right upper hole 24 on the first visual side panel 12, and the left upper open hole shaft 50 corresponds to a left upper hole 25 on the first visual side panel 12.
The device has the advantages of reasonable structure, reliable principle, convenient use, no potential safety hazard, low experiment cost, repeatability and good popularization.
Example 6
Referring to fig. 1-4, a visual experiment device for dynamically simulating a shale fracturing network comprises a visual simulated shale rock sample 1, a comprehensive console 2 and a high-definition camera 3, wherein the high-definition camera 3 is electrically connected with the comprehensive console 2, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, a first constant-speed constant-pressure pump 5, a second constant-speed constant-pressure pump 6, a hydraulic chamber 7, a multi-stage fluid injection end, a simulated shaft 9 and a liquid collection tank 8, coordinate scales are arranged on the visual fractured cavity 4, the visual fractured cavity 4 is connected with the liquid collection tank 8, the visual simulated shale rock sample 1 is arranged in the visual fractured cavity 4, three-axis hydraulic power ends of the visual fractured cavity 4 are respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fractured cavity 4 are both connected with an outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual simulated shale rock sample 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-, the hydraulic chamber 7 is connected with the second constant-speed constant-pressure pump 6, and the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are connected with the integrated control console 2 through control circuits.
The visual fracturing cavity 4 is connected with a first constant-speed constant-pressure pump 5 through a first pipeline, and a first pressure gauge 10 and a first switch valve 11 are arranged on the first pipeline.
The visual fracturing cavity 4 comprises a first visual side panel 12, a visual upper panel 13, a first hydraulic side panel 14, a first sealing piston 15, a second hydraulic side panel 16, a second sealing piston 17, a third hydraulic side panel 18, a third sealing piston 19 and a second visual side panel 20, wherein the first visual side panel 12 is provided with a central hole 21, a right lower hole 22, a left lower hole 23, a right upper hole 24 and a left upper hole 25, the first hydraulic side panel 14 is driven by the first sealing piston 15, the second hydraulic side panel 16 is driven by the second sealing piston 17, and the third hydraulic side panel 18 is driven by the third sealing piston 19.
The multistage fluid injection end comprises a low-viscosity fluid intermediate container 26, a medium-viscosity fluid intermediate container 27 and a high-viscosity fluid intermediate container 28, the low-viscosity fluid intermediate container 26 is connected with the first constant-speed constant-pressure pump 5 through a second pipeline, a second switching valve 29 is arranged on the second pipeline, the medium-viscosity fluid intermediate container 27 is connected with the first constant-speed constant-pressure pump 5 through a third pipeline, a third switching valve 30 is arranged on the third pipeline, the high-viscosity fluid intermediate container 28 is connected with the first constant-speed constant-pressure pump 5 through a fourth pipeline, and a fourth switching valve 31 is arranged on the fourth pipeline.
The visual fracturing cavity 4 is connected with the liquid collecting tank 8 through a fifth pipeline, and a second pressure gauge 32 and a fifth switch valve 33 are arranged on the fifth pipeline.
The hydraulic chamber 7 comprises a first hydraulic cylinder 34, a second hydraulic cylinder 35 and a third hydraulic cylinder 36, the inlet end of the first hydraulic cylinder 34 is connected with a second constant-speed constant-pressure pump 6 through a first liquid inlet pipeline, the outlet end of the first hydraulic cylinder 34 is connected with a second hydraulic side panel 16 through a first liquid outlet pipeline, the first liquid outlet pipeline is provided with a third pressure gauge 37 and a sixth switch valve 38, the first liquid inlet pipeline is provided with a seventh switch valve 39, the inlet end of the second hydraulic cylinder 35 is connected with the second constant-speed constant-pressure pump 6 through a second liquid inlet pipeline, the outlet end of the second hydraulic cylinder 35 is connected with the first hydraulic side panel 14 through a second liquid outlet pipeline, the second liquid inlet pipeline is provided with an eighth switch valve 40, the second liquid outlet pipeline is provided with a fourth pressure gauge 41 and a tenth switch valve 42, the inlet end of the third hydraulic cylinder 36 is connected with the second constant-speed constant-pressure pump 6 through a third liquid inlet pipeline, the outlet end of the third hydraulic cylinder 36 is connected to the third hydraulic side panel 18 through a third liquid outlet line, a ninth switch valve 43 is disposed on the third liquid inlet line, and a fifth pressure gauge 44 and an eleventh switch valve 45 are disposed on the third liquid outlet line.
The visual simulation shale rock sample 1 is internally provided with a central open hole shaft 46, a right lower open hole shaft 47, a left lower open hole shaft 48, a right upper open hole shaft 49 and a left upper open hole shaft 50, the central open hole shaft 46 corresponds to a central hole 21 on the first visual side panel 12, the right lower open hole shaft 47 corresponds to a right lower hole 22 on the first visual side panel 12, the left lower open hole shaft 48 corresponds to a left lower hole 23 on the first visual side panel 12, the right upper open hole shaft 49 corresponds to a right upper hole 24 on the first visual side panel 12, and the left upper open hole shaft 50 corresponds to a left upper hole 25 on the first visual side panel 12.
The pumping range of the first constant-speed constant-pressure pump 5 is 0-30MPa, the error is less than 0.01MPa, the flow of the first constant-speed constant-pressure pump 5 is 20ml/min, and the error is less than 0.01 ml/min; the pumping range of the second constant-speed constant-pressure pump 6 is 0-30MPa, the error is less than 0.01MPa, the flow of the second constant-speed constant-pressure pump 6 is 20ml/min, and the error is less than 0.01 ml/min.
The visual fracturing cavity 4 is provided with coordinate scales, the visual fracturing cavity 4 is connected with the liquid collecting tank 8, the visual simulated shale rock sample 1 is arranged in the visual fracturing cavity 4, the three-axis hydraulic power end of the visual fracturing cavity 4 is respectively connected with the hydraulic chamber 7, the visual simulated shale rock sample 1 and the visual fracturing cavity 4 are both connected with the outlet of the multi-stage fluid injection end through the simulated shaft 9, the visual fracturing cavity 4 and the multi-stage fluid injection end are both connected with the first constant-speed constant-pressure pump 5, the hydraulic chamber 7 is both connected with the second constant-speed constant-pressure pump 6, the first constant-speed constant-pressure pump 5 and the second constant-speed constant-pressure pump 6 are both connected with the comprehensive control console 2 through control circuits, compared with the prior art, the invention can simulate the morphological change of crack initiation, expansion and extension of shale in the hydraulic fracturing process, and meet the quantitative requirements of crack morphology under different fracturing modes and construction parameter conditions, the simulation result can be used for guiding the design optimization of the fracturing scheme, the decision adjustment of field construction and the quantitative evaluation after fracturing, and has important significance for the high-quality development and acceleration and synergy of the shale gas.
The simulation system can simulate a single-well fracturing mode, a multi-well zipper mode and a multi-well synchronous mode, can simulate slight changes of fracture shapes under different displacement intervals, perforation parameters and liquid performance conditions, and has good universality.
Claims (7)
1. The utility model provides a visual experimental apparatus of dynamic simulation shale fracturing network, includes visual simulation shale rock specimen (1), comprehensive control platform (2) and high definition and shoots with video-corder camera (3), and camera (3) are shot with video-corder to the high definition and are connected its characterized in that with comprehensive control platform (2) electricity: the device is characterized by further comprising a visual fracturing cavity (4), a first constant-speed constant-pressure pump (5), a second constant-speed constant-pressure pump (6), a hydraulic chamber (7), a multi-stage fluid injection end, a simulation shaft (9) and a liquid collection tank (8), wherein coordinate scales are arranged on the visual fracturing cavity (4), the visual fracturing cavity (4) is connected with the liquid collection tank (8), the visual simulation shale rock sample (1) is arranged in the visual fracturing cavity (4), a three-shaft hydraulic power end of the visual fracturing cavity (4) is respectively connected with the hydraulic chamber (7), the visual simulation shale rock sample (1) and the visual fracturing cavity (4) are both connected with an outlet of the multi-stage fluid injection end through the simulation shaft (9), the visual fracturing cavity (4) and the multi-stage fluid injection end are both connected with the first constant-speed constant-pressure pump (5), and the hydraulic chamber (7) is both connected with the second constant-speed constant-pressure pump (6), the first constant-speed constant-pressure pump (5) and the second constant-speed constant-pressure pump (6) are connected with the comprehensive control console (2) through control circuits.
2. The visual experimental device for dynamically simulating shale fracturing fracture network according to claim 1, characterized in that: the visual fracturing cavity (4) is connected with a first constant-speed constant-pressure pump (5) through a first pipeline, and a first pressure gauge (10) and a first switch valve (11) are arranged on the first pipeline.
3. The visual experimental device for dynamically simulating shale fracturing fracture network according to claim 1, characterized in that: the visual fracturing cavity (4) comprises a first visual side panel (12), a visual upper panel (13), a first hydraulic side panel (14), a first sealing piston (15), a second hydraulic side panel (16), a second sealing piston (17), a third hydraulic side panel (18), a third sealing piston (19) and a second visual side panel (20), wherein a central hole (21), a right lower hole (22), a left lower hole (23), a right upper hole (24) and a left upper hole (25) are formed in the first visual side panel (12), the first hydraulic side panel (14) is driven through the first sealing piston (15), the second hydraulic side panel (16) is driven through the second sealing piston (17), and the third hydraulic side panel (18) is driven through the third sealing piston (19).
4. The visual experimental device for dynamically simulating shale fracturing fracture network according to claim 1, characterized in that: the multistage fluid injection end comprises a low-viscosity fluid intermediate container (26), a medium-viscosity fluid intermediate container (27) and a high-viscosity fluid intermediate container (28), the low-viscosity fluid intermediate container (26) is connected with a first constant-speed constant-pressure pump (5) through a second pipeline, a second switch valve (29) is arranged on the second pipeline, the medium-viscosity fluid intermediate container (27) is connected with the first constant-speed constant-pressure pump (5) through a third pipeline, a third switch valve (30) is arranged on the third pipeline, the high-viscosity fluid intermediate container (28) is connected with the first constant-speed constant-pressure pump (5) through a fourth pipeline, and a fourth switch valve (31) is arranged on the fourth pipeline.
5. The visual experimental device for dynamically simulating shale fracturing fracture network according to claim 1, characterized in that: the visual fracturing cavity (4) is connected with the liquid collecting tank (8) through a fifth pipeline, and a second pressure gauge (32) and a fifth switch valve (33) are arranged on the fifth pipeline.
6. The visual experimental device for dynamically simulating shale fracturing fracture network according to claim 3, characterized in that: the hydraulic chamber (7) comprises a first hydraulic cylinder (34), a second hydraulic cylinder (35) and a third hydraulic cylinder (36), the inlet end of the first hydraulic cylinder (34) is connected with a second constant-speed constant-pressure pump (6) through a first liquid inlet pipeline, the outlet end of the first hydraulic cylinder (34) is connected with a second hydraulic side panel (16) through a first liquid outlet pipeline, a third pressure gauge (37) and a sixth switch valve (38) are arranged on the first liquid outlet pipeline, a seventh switch valve (39) is arranged on the first liquid inlet pipeline, the inlet end of the second hydraulic cylinder (35) is connected with the second constant-speed constant-pressure pump (6) through a second liquid inlet pipeline, the outlet end of the second hydraulic cylinder (35) is connected with the first hydraulic side panel (14) through a second liquid outlet pipeline, an eighth switch valve (40) is arranged on the second liquid inlet pipeline, a fourth pressure gauge (41) and a tenth switch valve (42) are arranged on the second liquid outlet pipeline, the inlet end of a third hydraulic cylinder (36) is connected with a second constant-speed constant-pressure pump (6) through a third liquid inlet pipeline, the outlet end of the third hydraulic cylinder (36) is connected with a third hydraulic side panel (18) through a third liquid outlet pipeline, a ninth switch valve (43) is arranged on the third liquid inlet pipeline, and a fifth pressure gauge (44) and an eleventh switch valve (45) are arranged on the third liquid outlet pipeline.
7. The visual experimental device for dynamically simulating shale fracturing fracture network according to claim 3, characterized in that: the visual simulation shale rock sample (1) is internally provided with a central open hole shaft (46), a right lower open hole shaft (47), a left lower open hole shaft (48), a right upper open hole shaft (49) and a left upper open hole shaft (50), the central open hole shaft (46) corresponds to a central hole (21) on a first visual side panel (12), the right lower open hole shaft (47) corresponds to a right lower hole (22) on the first visual side panel (12), the left lower open hole shaft (48) corresponds to a left lower hole (23) on the first visual side panel (12), the right upper open hole shaft (49) corresponds to a right upper hole (24) on the first visual side panel (12), and the left upper open hole shaft (50) corresponds to a left upper hole (25) on the first visual side panel (12).
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Application publication date: 20200410 |