CN111855357B - Device for simulating local brittleness characteristic functional fracturing rock core manufacturing and crack monitoring - Google Patents
Device for simulating local brittleness characteristic functional fracturing rock core manufacturing and crack monitoring Download PDFInfo
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- CN111855357B CN111855357B CN202010774095.8A CN202010774095A CN111855357B CN 111855357 B CN111855357 B CN 111855357B CN 202010774095 A CN202010774095 A CN 202010774095A CN 111855357 B CN111855357 B CN 111855357B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- 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
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- 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
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- G01N2203/0019—Compressive
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- 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
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- 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
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- G01N2203/0087—Resistance to crushing
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Abstract
The invention relates to a functional fractured rock core manufacturing and crack monitoring device for simulating local brittleness characteristics, which comprises a rock core material input system, a plurality of pressure loading systems, a porous partition plate die device, a fracturing system and a gamma-CT scanning device, wherein the rock core material input system is composed of a plurality of material mixing devices, the plurality of material mixing devices are all connected to the porous partition plate die device, a rock core manufactured by the porous partition plate die device is arranged in the fracturing device of the fracturing system, and is monitored by the fracturing monitoring system during fracturing; transparent organic glass inboard wall evenly sets up the filling hole, and the filling hole is the array form and arranges, and two adjacent rows of filling holes or adjacent two are listed as all to be fluted between the filling hole, and transparent organic glass inboard wall is along diagonal cross's recess, during the preparation rock core, selects recess installation adhesive baffle wherein to produce the various rock cores that have different local brittle characteristics and natural fracture. The invention realizes the integration of cementation and fracturing monitoring.
Description
The technical field is as follows:
the invention relates to a method and a device for manufacturing a core with local brittleness characteristics according to a mold, aiming at test requirements and underground rock attributes, in particular to a functional fracturing core manufacturing and crack monitoring device for simulating local brittleness characteristics.
Secondly, the background technology:
at present, the hydraulic fracturing technology is a widely applied yield-increasing measure in the field of petroleum engineering, and a better oil-gas seepage channel is formed in a reservoir through the hydraulic fracturing technology. And an oil flow channel between the stratum and the well bottom is established, so that the oil gas yield is increased, and the purpose of greatly increasing the oil gas yield is achieved. The brittleness characteristic of the rock is an important parameter for influencing and controlling the evolution mechanism of the fracturing fracture and the formation of a fracture network, and the influence of the heterogeneity of the rock and the development condition of natural fractures in the rock body on the brittleness of the rock is analyzed, so that the method has important significance for guiding the trend of the fracturing fracture and modifying the volume of a reservoir. Research shows that the macroscopic brittle fracture of the rock is a process that local cracks in the rock continuously grow and expand under the action of external load, the macroscopic fracture is an appearance initiated after the local fracture reaches a certain degree, and the local fracture is a root cause of the macroscopic fracture. The research on the local brittleness characteristics of the rock can reveal the intrinsic nature of the fracture behavior of the rock, and can more directly and accurately reflect the evolution mechanism of the fracture. However, as the conditions for obtaining the natural core in the fracturing process are limited, most of the cores adopted in the tests are artificial fractured cores and have no obvious brittle delamination, and great challenges are generated in the fracturing for researching the local brittle characteristics of the natural core. In the process of manufacturing the natural core, the following technical problems exist: (1) when the natural core is made of the material, natural cracks need to be made in advance, most experimenters prepare the core by an internal inclusion method, the prefabricated crack form is easy to change in the core preparation process, or the internal inclusion in fracturing influences crack propagation and the like, so that the actual fracturing effect is influenced. (2) Most test cores were prepared under conventional experimental conditions and lacked the stress state of the subsurface, which is quite different from the formation conditions of natural fractures. Although the conditions of ground stress are simulated in the subsequent fracturing process, the conditions are still very different from the actual fracturing engineering. (3) The phenomenon that the actual fracturing meets different local brittleness cannot be simulated in the process of manufacturing the rock core. (4) The actual condition of fracturing can not be monitored and described in real time in the fracturing process, and the fracture expansion condition can not be effectively monitored. The problems of core preparation and fracture monitoring are not well solved, and the technical problems of preparation of the functional core with natural fracture and local brittleness characteristics and real-time monitoring in the fracturing process are solved at present.
Thirdly, the invention content:
the invention aims to provide a functional fractured core manufacturing and fracture monitoring device for simulating local brittleness characteristics, which is used for solving the problems that the functional fractured core manufacturing and fracture monitoring device for simulating local brittleness characteristics is difficult to prepare natural fractures and local brittleness characteristics and monitors in real time in a fracturing process at present.
The technical scheme adopted by the invention for solving the technical problems is as follows: the functional fractured rock core manufacturing and crack monitoring device for simulating local brittleness characteristics comprises a rock core material input system, a plurality of pressure loading systems, a porous partition plate die device, a fracturing system and a gamma-CT scanning device, wherein the rock core material input system is composed of a plurality of material mixing devices which are all connected to the porous partition plate die device, a rock core manufactured by the porous partition plate die device is arranged in the fracturing device of the fracturing system, and is monitored by the fracturing monitoring system during fracturing;
the porous partition plate die device comprises a porous partition plate die and a plurality of force application devices, the porous partition plate die is arranged on a die slideway, the porous partition plate die is formed by splicing and combining a plurality of transparent organic glass plates, the bottom surface of the porous partition plate die is arranged on the die slideway, the rest of the transparent organic glass plates are respectively connected with one force application device, each force application device is connected with one pressure loading system, each force application device comprises a gas pipeline, a connecting shaft, a gas-driven telescopic rod and a shock pad, the gas pipeline is connected with the gas-driven telescopic rod, the tail end of the gas-driven telescopic rod is connected with the shock pad, the shock pad is connected with the transparent organic glass plates, the force application devices are firmly connected with the shock pads and the transparent organic glass plates through the gas-driven telescopic rods, and the force application devices apply force to the corresponding transparent organic glass plates along the force application device slideway while sliding; the inner wall of the transparent organic glass plate is uniformly provided with injection holes which are threaded holes, the injection holes are arranged in an array form, grooves are formed between two adjacent rows of injection holes or two adjacent columns of injection holes, the inner wall of the transparent organic glass plate is provided with grooves crossed along diagonal lines, and when the rock core is manufactured, the grooves are selected to be provided with adhesive partition plates, so that various rock cores with different local brittleness characteristics and natural cracks are manufactured;
the fracturing system comprises a fracturing device, a pressure applying device and a fracturing monitoring system, wherein the fracturing device comprises a fracturing support, the fracturing support is provided with a vertical plate, two support rods are horizontally fixed on one side of the vertical plate, a space between the two support rods and a fracturing support seat is a rock core fracturing chamber, a shell of the pressure applying device is connected with the two support rods in a sliding manner, after a prepared rock core is placed in the rock core fracturing chamber, the shell of the pressure applying device slides to the vertical plate to seal the rock core in the pressure applying device, a gamma-CT scanning device is in a circular ring shape and surrounds the rock core fracturing chamber, in the fracturing process, the gamma-CT scanning device emits gamma rays to enable an adhesive partition plate to be an adhesive, the gluing and the formation of cracks of the rock core are completed, the gluing condition and the crack condition of underground rock are simulated, meanwhile, the gamma-CT scanning device scans the fracturing process to detect and observe the cracks and the expansion condition thereof, describing the formation rule of the multistage cracks.
According to the scheme, the adhesive partition plate is made by adding fluorescent materials into a radiation type adhesive, the radiation type adhesive takes butyl acrylate as a raw material, a gamma-CT scanning device selects 100Ci of radioactivity and cobalt-60 as a radioactive source, gamma rays are generated when cobalt 60 decays, butyl acrylate is subjected to polymerization reaction under the action of the gamma rays, a high polymer adhesive is generated, and the cementation of a rock core and the formation of cracks are completed.
The size and the shape of the adhesive clapboard in the scheme are designed at will, the rock cores with different local brittleness characteristics are manufactured by changing the shape and the arrangement of the adhesive clapboard and the difference of the material conveying pipelines connected into the injection holes, the rock cores have different crack characteristics, the local brittleness characteristics and the crack forms are changed by changing the size and the shape of the adhesive clapboard, and the size and the shape of the rock cores are changed by changing the size and the shape of the porous clapboard mould.
In the scheme, the two transparent organic glass wood plates on the periphery of the porous partition plate mold are connected through the wedge-shaped fixing plates, each wedge-shaped fixing plate is connected with one thrust rod, and the thrust rods can automatically stretch and retract and can be automatically loaded to joints of the glass plates.
The pressure loading system comprises a gas storage tank, a pressure control unit and a pressure monitoring system, wherein the gas storage tank is connected with each force application device through a gas transmission pipeline, the pressure control unit is arranged on the gas transmission pipeline, a gas flow and a pressure control valve are arranged on the gas transmission pipeline at the outlet of the gas storage tank, and the gas flow and the pressure control valve are connected with the pressure monitoring system.
Material mixing device includes rock core raw materials preparation pond, raw materials stirring unit, flow control valve, agitator among the above-mentioned scheme, and during rock core raw materials preparation pond was arranged in to the agitator, flow control valve passed through raw materials conveying pipeline and connects rock core raw materials preparation pond, and raw materials stirring unit passes through transmission system and connects the agitator, and rock core raw materials preparation pond passes through material conveying pipeline and connects porous partition plate mould.
The invention has the following beneficial effects:
1. the invention realizes the integration of cementation and fracturing monitoring, and the cementation part presents fluorescent color in the fracturing process, thereby not only solving the problem of cementation in the test, but also meeting the requirements of the test on monitoring and recording. And the shape of the adhesive separator can be designed into any shape and size to meet various requirements.
2. The mold provided by the invention can be used for manufacturing cores with different volumes and shapes according to requirements, and cores with different crack characteristics and various local brittleness characteristics and forms are simultaneously manufactured, so that the problem of fixing the mold by using the traditional mold is solved.
3. The invention can make cracks with different characteristics by changing the thickness, shape and position of the separator; the rock core containing different mineral contents and having various local brittleness characteristics is prepared by changing the variety and the quantity of the rock core material according to the requirements, thereby solving various requirements of the test.
4. The invention can fracture the rock core, monitor and record the whole fracturing process by starting the scanning device in the fracturing process, and show the fracturing process on the display equipment, thereby satisfying the observation, recording and monitoring of the test on the fracture forming process.
5. The invention provides a method for preparing a core with local brittleness characteristics, provides a method for preparing cores with local brittleness characteristics in any different forms, and solves the problem that the test needs cores with different local brittleness characteristics.
6. The invention can monitor and describe the real-time condition in the fracturing process and the fracture expansion condition, can manufacture the core which better meets the characteristics of the natural fracture and has local brittleness characteristics according to the actual requirement, and can monitor and describe the core in the fracturing process in real time, thereby solving the technical problems of preparing the core with multiple fractures and local brittleness characteristics of the natural reservoir and monitoring and describing the fractures in real time in the fracturing process.
Description of the drawings
FIG. 1 is a schematic diagram of the overall apparatus of the present invention.
Fig. 2 is a schematic view of the porous separator mold apparatus of the present invention.
FIG. 3 is a schematic view of the force applying apparatus of the present invention.
Fig. 4 is a perspective view of a fracturing apparatus of the present invention;
fig. 5 is a schematic view of the internal structure of the fracturing apparatus of the present invention.
In the figure: 1 material mixing device, 2 raw material stirring units, 3 core raw material making pool, 4 flow control valves, 5 raw material conveying pipelines, 6 transmission systems, 7 mixed materials, 8 conveying control valves, 9 material conveying pipelines, 10 gas conveying pipelines, 11 gas flow, pressure control valves, 12 pressure monitoring systems, 13 gas storage tanks, 14 pressure control units, 15 force application devices, 16 shock pads, 17 transparent organic glass plates, 18 adhesive partition plates, 19 injection holes, 20 die slideways, 21 gas control devices, 22 fracturing devices, 23 fracturing monitoring systems, 24 force application device slideways, 25 wedge-shaped fixing plates, 26 gas drive telescopic rods, 27 gas pipelines, 28 connecting shafts, 29 gamma-CT scanning devices, 30 pressure application devices, 31 gas conveying channels, 32 core fracturing chambers and 33 cores.
Fifth, detailed description of the invention
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the functional fractured core manufacturing and fracture monitoring device for simulating local brittleness characteristics comprises a core material input system, a plurality of pressure loading systems, a porous partition plate die device, a fracturing system and a gamma-CT scanning device 29, wherein the core material input system is composed of a plurality of material blending devices 1, the material blending devices 1 are all connected to the porous partition plate die device, a core 33 manufactured by the porous partition plate die device is arranged in a fracturing device 22 of the fracturing system, and is monitored by a fracturing monitoring system 23 during fracturing; the core material input system is composed of a plurality of material mixing devices, and the material mixing devices are all connected to the porous partition plate die device.
Referring to fig. 2, the porous partition plate mold device includes a force applying device 15, a force applying device slide 24, a wedge-shaped fixing plate 25, a cushion 16, and a porous partition plate mold. In this embodiment, the porous partition plate mould is formed by six transparent organic glass boards 17 according to cube rock core shape amalgamation combination, and on mould slide 20 was arranged in to its bottom surface, the concatenation face can be adjusted the size as required, makes it satisfy experimental demand size, and five concatenation faces all are connected with force application device 15 through the connecting rod post, can control transparent organic glass board 17 freely to slide the removal on the slide according to the demand to exert pressure to the rock core, make the rock core solidify the shaping.
The injection holes 19 are uniformly distributed on the surface of the transparent organic glass plate 17 (porous flat plate), the injection holes 19 are threaded holes, six surfaces are the same, each row or each column is a group of injection holes, the injection holes 19 are connected with the material conveying pipeline 9 in a threaded connection mode, grooves are formed between two rows or two columns, and crossed grooves are formed in two diagonal lines and used for placing the adhesive partition plates 18. When the core is manufactured, the adhesive is used for layering partition plates with different brittle characteristic requirements and for manufacturing natural cracks, so that the core 33 with any different forms of local brittle characteristics can be manufactured by changing the mode of raw materials according to test requirements, the form of the natural cracks is simulated by changing the position of the adhesive partition plate 18, the core 33 with the natural crack characteristics is manufactured, and various cores with different local brittle characteristics and different crack characteristics can be manufactured by changing the shape and arrangement of an adhesive flat plate interlayer in a mould and the difference of connecting a material pipeline to a porous flat plate injection hole according to the requirements.
The present invention uses a radiation-type adhesive and a gamma-CT scanning device 29. The radiation type adhesive is prepared by using butyl acrylate as a main raw material and adding a fluorescent material to the main raw material to form an adhesive partition, so that the recording can be observed and recorded on a display device conveniently. By consulting the data, the cobalt 60 generates gamma rays when decaying, and butyl acrylate generates polymerization reaction under the action of the gamma rays and produces the high molecular adhesive. It has the following characteristics that the reaction is carried out at normal temperature and heating is not needed. When the core is fed into the core fracturing chamber, the gamma-ray barrier emitted by the gamma-CT scanning device 29 becomes a sticky adhesive, simulating the cementing and fracturing conditions of the underground rock. According to the test requirements, the size and the shape of the radiation type adhesive can be designed into any shape according to the test requirements, and different materials can be added according to different realized functions to meet the requirements of various tests. The gamma-CT scanner 29 is a circular ring-shaped device mounted inside the fracturing unit 22 and surrounds the core fracturing chamber 32. The gamma-CT scanner 29 uses 100Ci of cobalt-60 as the radioactive source. The gamma-CT scanning device 29 is matched with the radiation type adhesive for use, the gamma-CT scanning device is started, and gamma rays are emitted, so that the radiation type adhesive is converted into the adhesive from a clapboard shape; meanwhile, in the fracturing process, the whole fracturing process is scanned, and the cracks and the expansion conditions thereof can be detected and observed.
And adjusting the porous flat plate according to the local brittleness characteristic requirement and the simple crack form requirement, and installing the radiation type adhesive at the corresponding position. The adhesive can act as a delamination between different brittleness and also as a simulated natural crack. The position of the adhesive can be installed according to the test requirement, then the parts separated by the adhesive clapboard can be injected with the same core material or different core materials, cores with various crack forms can be manufactured according to the adjustment of the position of the adhesive clapboard 18, and the cracks can be in the same brittle layer or can cross different brittle layers. The porous flat plate is connected with the gas drive telescopic rod 26, the connecting shaft 28 above the porous flat plate and the gas pipeline 27, the gas drive telescopic rod 26 is automatically controlled through data displayed by the pressure monitoring system 12, the angle and the position of the porous flat plate are adjusted in real time to meet the test requirement, and the porous flat plate and the rest porous flat plate form a closed module. The invention is described with a cubic mold and contains four brittle layers. Six faces can be combined into a closed hexahedron as a module, three rows and three columns of crossed uniformly distributed grooves for the six faces, and grooves crossed by diagonal lines evenly divide each face into small squares of 4 x 4 for mounting the adhesive spacers 18. And an injection hole 19 is formed in the middle of each square and used for injecting the core material, and the injection hole 19 can be plugged by a screw cap to prevent the core material from leaking outwards. The core material input system is matched with the porous partition plate die device and other related systems to prepare cores with different local brittleness characteristics, and the cores can simultaneously have various simulated natural cracks to meet various requirements.
Referring to fig. 3, the force applying device includes a gas pipe 27, a connecting shaft 28, a gas driven telescopic rod 26 (acting like a jack), and a shock pad 16. The gas pipeline 27 is connected with the transparent organic glass plate 17 through a connecting shaft 28, four gas drive telescopic rods 26 and the shock absorption pad 16, the connecting shaft 28 is communicated with the gas pipeline 27, the gas pipeline 27 is connected with a pressure loading system, and the gas drive telescopic rods 26 are stretched through gas drive. During operation, data are monitored through the pressure monitoring system 12, the gas flow and the pressure control valve 11 are adjusted in real time, and the gas drive telescopic rod 26 is adjusted through the pressure control unit 14. The gas drive telescopic rod 26 is telescopic to monitor and adjust the angle and the position of the transparent organic glass plate 17 (porous flat plate) on the upper surface of the porous partition plate mould, so that the angle and the position of the transparent organic glass plate are maintained at the angle and the position required by the test, wherein the gas drive telescopic rod 26 is connected with the porous flat plate through the shock absorption pad 16, the pressure buffering effect is achieved, and the rock core and the device are prevented from being damaged when the pressure is excessively increased or suddenly released. The force application devices 15 are firmly connected with the shock absorption pad 16 and the transparent organic glass plate 17 through the rod columns and can slide on the force application device slide ways 24, each force application device 15 is connected with the pressure loading system, the monitoring system monitors the force application devices 15 and controls the applied pressure through the pressure control system, and the force application devices 15 are adjusted and pressed in real time to meet the manufacturing requirements.
The wedge-shaped fixing plates 25 are made of hard rubber, the force application devices 15 push the transparent organic glass plates 17 to reach preset positions, and after each transparent organic glass plate is closed, the wedge-shaped fixing plates 25 are added at the closed edges of two adjacent transparent organic glass plates 17 to play a role in fixing and sealing a die, so that core raw materials are prevented from leaking; the wedge-shaped fixing plates 25 are respectively connected with a thrust rod, and the thrust rods can automatically extend and retract and can be automatically loaded to the joint of the glass plates. Porous transparent organic glass board all has shock pad 16, and in the rock core manufacture process, shock pad 16 is connected with force application device 15 through the connecting rod post, provides the required container of mould, exerts load to the mould, plays better sealed effect, prevents that rock core material from extrudeing transparent organic glass board in the rock core manufacture process, makes the seepage of rock core material.
In the process of making the rock core, the gas conveying device is automatically controlled through data displayed by the pressure monitoring system 12, the angle and the position of the porous flat plate are adjusted in real time, so that the porous flat plate is uniformly stressed all the time, the test requirements are met, and the porous flat plate and other flat plates form a closed module.
The invention can manufacture the rock cores with different shapes by adjusting system parameters. The unused threaded hole can be plugged by a nut, so that the core material is prevented from leaking outwards. Cores with different fracture characteristics can be manufactured through the porous partition plate die device, and the size and the shape of the cores and the material of the cores can be changed by changing the size and the shape of the die and injecting materials.
The pressure loading system comprises a gas storage tank 13, a pressure control unit 14 and a pressure monitoring system, wherein the gas storage tank 13 is connected with each force application device through a gas transmission pipeline 10, the pressure control unit is arranged on the gas transmission pipeline 10, a gas flow and pressure control valve is arranged on the gas transmission pipeline at the outlet of the gas storage tank, and the gas flow and pressure control valve is connected with the pressure monitoring system.
The material mixing device 1 comprises a core raw material making pool 3, a raw material stirring unit 2, a flow control valve 4 and a stirrer, wherein the stirrer is arranged in the core raw material making pool 3, the flow control valve 4 is connected with the core raw material making pool 3 through a raw material conveying pipeline 5, the raw material stirring unit 2 is connected with the stirrer through a transmission system 6, and the core raw material making pool 3 is connected with a porous partition plate mould through a material conveying pipeline 9.
Referring to fig. 4, the fracturing system comprises a fracturing device 22, a pressure applying device 30 and a fracturing monitoring system 23, the fracturing device 22 comprises a fracturing support, the fracturing support is provided with a vertical plate, two support rods are horizontally fixed on one side of the vertical plate, a space between the two support rods and a fracturing support base is a core fracturing chamber 32, a shell of the pressure applying device is in sliding connection with the two support rods, a manufactured core is placed in the core fracturing chamber 32, the shell of the pressure applying device slides to the vertical plate to seal the core in the pressure applying device 30, a gas conveying channel 31 is connected with the pressure applying device 30, a gamma-CT scanning device 29 is in a circular ring shape and surrounds the core fracturing chamber 32, during the fracturing process, the gamma-CT scanning device 29 emits gamma rays to enable an adhesive partition plate 18 to become an adhesive, the cementing and the formation of cracks of the core are completed, the cementing conditions and the cracking conditions of underground rocks are simulated, meanwhile, the gamma-CT scanning device 29 scans the fracturing process, detects and observes cracks and expansion conditions thereof, and describes the formation rule of the multi-stage cracks.
Through the coupling of the fracturing device 22 and the gamma-CT scanning device 29, the fracturing device 22 performs fracturing according to pressure and data provided by a pressure applying system, the gamma-CT scanning device 29 converts the radiation type adhesive from a flat plate shape into the adhesive to complete the cementation of the rock core and the formation of the crack, and simultaneously monitors and records the whole fracturing process, describes the formation rule of the multi-stage crack in detail and realizes the integration of cementation and monitoring.
The pressure applying device 30 is a confining pressure applying device in the fracturing process in the prior art, and the pressure applying device is provided with a fracturing monitoring system and used for monitoring the core fracturing process. The core fracturing chamber 32 provides the necessary fracturing environment for fracturing. The pressure applicator 30 is also connected to a pressure loading system.
The pressure monitoring system 12 is used for monitoring the pressure in the core fracturing chamber 32 in real time, and the pressure monitoring system and the gas control device 21 in the pressure loading system are correspondingly adjusted according to the data monitored by the pressure monitoring system, so that the fracturing device is controlled and adjusted in real time. The gamma-CT scanning device 29 is arranged in the fracturing device 22 and is used for scanning the whole process of core fracturing, and the scanning process can be displayed and recorded on the fracturing monitoring system 23 to provide reliable and comprehensive data for the test. At the same time, the gamma-CT scanner 29 may emit gamma rays that transition the adhesive spacers 18 from the spacer state to the tacky state, providing a consolidated and simulated natural fracture for the core.
The core material input system, the porous partition plate die device, the fracturing system and other related systems are matched with one another to manufacture cores with different well pattern distribution characteristics, and various requirements are met.
The experimental method of the invention is as follows:
the first step is as follows: preparing materials for manufacturing the rock core according to needs, respectively putting the rock core raw materials into different rock core raw material manufacturing pools 3, starting the raw material stirring unit 2, slowly opening the flow control valve 4, inputting the rock core raw materials into the rock core raw material manufacturing pools 3 while stirring, and uniformly stirring the mixed materials 7. The flow of core material is controlled by the conduit and flow control device.
The second step is that: data meeting the requirements are sequentially input into a pressure monitoring system to serve as initial conditions, then a pressure loading system and a porous partition plate die device are started, a radiation type adhesive is installed in a porous flat plate according to test requirements, the porous partition plate die device is observed, after the porous partition plate die is closed, a wedge-shaped fixing plate 25 is installed, after sealing is determined, corresponding core material input pipes are connected with corresponding injection holes 19 according to different local brittleness characteristics, a conveying control valve is opened, mixed raw materials are continuously stirred, core materials are smoothly conveyed into the closed porous partition plate die, when the die is filled with the core materials, the conveying control valve 8 is closed, and then the whole core material input system is closed.
The third step: after the core material is solidified, opening the porous partition plate mould, conveying the core to the core fracturing chamber 32 along the slide way, and fixing the core; inputting relevant parameters into a crack monitoring system in advance, starting a gamma-CT scanning device 29, waiting for 5-10 min, keeping the gamma-CT scanning device started after observing that the adhesive partition plate 18 is completely converted into the cement, starting a fracturing device 22, and paying attention to observation.
The fourth step: and (4) leading out and arranging data after the experiment is finished enough, taking out the rock core after the experiment is finished gently, and cleaning the test device. The power is turned off.
It should be noted that the invention can be produced into moulds with different shapes and different volumes according to the requirements, different porous distribution flat plates can be designed according to the requirements according to the functional difference of local brittleness characteristics, fracture rock cores with different characteristics and different widths and various rock cores with different local brittleness characteristics can be produced according to the mould, and rock cores with different functions can be produced according to the functional difference; the shape and size of the core are also changeable, even the core with different mineral contents can be manufactured by changing the core material, so that different requirements of experiments can be met, and the characteristics of permeability, viscosity and the like of the crack can be changed by changing the material composition, size, thickness and shape of the adhesive, so that different functions can be realized. The device can be used for carrying out fracturing tests, monitoring, controlling and recording the whole fracturing process, and the related contents of the fluorescent materials in the fractures, which are convenient for observing the fracture formation rule and the fracture form belong to the technical methods provided by the invention, and if the related contents are similar, the technical methods belong to the technical scheme provided by the invention.
Claims (5)
1. The utility model provides a functional fracturing rock core preparation of simulation local fragility characteristic and crack monitoring devices which characterized in that: the functional fractured rock core manufacturing and crack monitoring device for simulating local brittleness characteristics comprises a rock core material input system, a plurality of pressure loading systems, a porous partition plate die device, a fracturing system and a gamma-CT scanning device (29), wherein the rock core material input system is composed of a plurality of material mixing devices (1), the plurality of material mixing devices (1) are connected to the porous partition plate die device, a rock core manufactured by the porous partition plate die device is arranged in a fracturing device (22) of the fracturing system, and the rock core is monitored by a fracturing monitoring system (23) during fracturing;
the porous partition plate die device comprises a porous partition plate die and a plurality of force application devices (15), the porous partition plate die is arranged on a die slideway (20), the porous partition plate die is formed by splicing and combining a plurality of transparent organic glass plates (17), the bottom surface of the porous partition plate die is arranged on the die slideway (20), the rest transparent organic glass plates are respectively connected with one force application device (15), each force application device (15) is connected with a pressure loading system, each force application device (15) comprises a gas pipeline (27), a connecting shaft (28), a gas drive telescopic rod (26) and a shock pad (16), the gas pipeline (27) is connected with the gas drive telescopic rod (26), the tail end of the gas drive telescopic rod (26) is connected with the shock pad (16), the shock pad (16) is connected with the transparent organic glass plates (17), and the force application devices (15) are firmly connected with the shock pad (16) and the transparent organic glass plates (17) through the gas drive telescopic rods (26), the force application device (15) slides along the force application device slide way (24) and applies force to the corresponding transparent organic glass plate; the inner wall of the transparent organic glass plate (17) is uniformly provided with injection holes (19), the injection holes are threaded holes, the injection holes (19) are arranged in an array mode, grooves are formed between two adjacent rows of injection holes or two adjacent columns of injection holes, the inner wall of the transparent organic glass plate is provided with grooves crossed along a diagonal line, and when the rock core is manufactured, the grooves are selected to be provided with adhesive partition plates (18) so as to manufacture various rock cores with different local brittle characteristics and natural cracks;
the fracturing system comprises a fracturing device (22), a pressure applying device (30) and a fracturing monitoring system (23), wherein the fracturing device (22) comprises a fracturing support, the fracturing support is provided with a vertical plate, two supporting rods are horizontally fixed on one side of the vertical plate, a rock core fracturing chamber (32) is arranged in a space between the two supporting rods and a fracturing support seat, a shell of the pressure applying device is in sliding connection with the two supporting rods, a manufactured rock core is placed in the rock core fracturing chamber (32), the shell of the pressure applying device slides to the vertical plate to seal the rock core in the pressure applying device (30), a gamma-CT scanning device (29) is in a circular ring shape and surrounds the rock core fracturing chamber (32), and in the fracturing process, the gamma-CT scanning device (29) emits gamma rays to enable an adhesive partition plate (18) to become an adhesive, so that the adhesion and the formation of cracks of the rock core are completed, and the adhesion conditions and the crack conditions of underground rock are simulated, meanwhile, a gamma-CT scanning device (29) scans the fracturing process, detects and observes cracks and expansion conditions thereof, and describes the formation rule of the multi-stage cracks;
the adhesive partition plate (18) is made by adding fluorescent materials into a radiation type adhesive, the radiation type adhesive takes butyl acrylate as a raw material, a gamma-CT scanning device (29) selects 100Ci of radioactivity and takes cobalt 60 as a radioactive source, gamma rays are generated when cobalt 60 decays, butyl acrylate is subjected to polymerization reaction under the action of the gamma rays, high molecular adhesive is generated, and the cementation of a rock core and the formation of cracks are completed.
2. The device for manufacturing the functional fractured core and monitoring the fractures according to claim 1, wherein the device is used for simulating local brittleness characteristics and is characterized in that: the size and the shape of the adhesive clapboard (18) are designed at will, cores with different local brittleness characteristics are manufactured by changing the shape and the arrangement of the adhesive clapboard and the difference of the material conveying pipeline (9) connected into the injection hole (19), the cores have different fracture characteristics, the local brittleness characteristics and the fracture form are changed by changing the size and the arrangement of the adhesive clapboard (18), and the size and the shape of the cores are changed by changing the size and the shape of a porous clapboard mould.
3. The device for manufacturing the functional fractured rock core and monitoring the fractures according to the simulation local brittleness characteristic of claim 2, wherein: two transparent organic glass wooden boards around the porous partition plate mould are connected through a wedge-shaped fixing plate (25), each wedge-shaped fixing plate (25) is connected with a thrust rod, and the thrust rods can automatically stretch and retract and can be automatically loaded to the joint of the glass boards.
4. The device for manufacturing the functional fractured rock core and monitoring the fractures according to the simulation local brittleness characteristic of claim 3, wherein: the pressure loading system comprises a gas storage tank (13), a pressure control unit (14) and a pressure monitoring system (12), wherein the gas storage tank (13) is connected with each force application device (15) through a gas transmission pipeline (10), the gas transmission pipeline (10) is provided with the pressure control unit (14), a gas flow and a pressure control valve (11) are arranged on a gas transmission pipeline at the outlet of the gas storage tank, and the gas flow and the pressure control valve (11) are connected with the pressure monitoring system (12).
5. The device for functional fracturing core production and fracture monitoring for simulating local brittleness characteristics according to claim 4, wherein: material mixing device (1) including rock core raw materials preparation pond (3), raw materials stirring unit (2), flow control valve (4), agitator, during rock core raw materials preparation pond (3) was arranged in to the agitator, rock core raw materials preparation pond (3) was connected through raw materials conveying line (5) in flow control valve (4), raw materials stirring unit (2) are through transmission system (6) connection agitator, porous partition mould is connected through materials conveying line (9) in rock core raw materials preparation pond (3).
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