CN114544335A - Method for evaluating circular seam hole-finding reconstruction experiment - Google Patents
Method for evaluating circular seam hole-finding reconstruction experiment Download PDFInfo
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- CN114544335A CN114544335A CN202011326471.3A CN202011326471A CN114544335A CN 114544335 A CN114544335 A CN 114544335A CN 202011326471 A CN202011326471 A CN 202011326471A CN 114544335 A CN114544335 A CN 114544335A
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- 238000011156 evaluation Methods 0.000 claims abstract description 18
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0016—Tensile or compressive
- 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
- G01N2203/0066—Propagation of crack
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0652—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors using contrasting ink, painting, staining
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Abstract
The invention discloses a seam following hole finding reconstruction experiment evaluation method, which comprises the following steps: fixing a rock sample, wherein the interior of the rock sample comprises natural cracks and karst caves; applying confining pressure to the rock sample to simulate triaxial stress; pumping acid liquor with a fluorescent tracer into the rock sample, simulating the pressure value of the acid liquor at the well mouth between the pore pressure value of the rock sample and the fracture pressure value of the rock sample, and stopping injecting the acid liquor when the fluorescent tracer is observed at the edge of the rock sample; and opening the rock sample, and observing the conditions of natural cracks and karst caves. The rock sample containing natural cracks and karst caves can simulate an oil reservoir with natural cracks and karst caves under the real condition, the rock sample is applied with confining pressure to simulate triaxial stress, acid liquor with a fluorescent tracer at a specific pressure value is injected to carry out joint-following cave finding, the development conditions of the carbonate rock cracks and the karst caves are considered, the crack expansion form and the acid liquor etching track can be visually and clearly observed, the research on the formation mechanism of the carbonate rock acid fracturing cracks is facilitated, and the site construction is guided.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a seam-following hole-finding reconstruction experiment evaluation method.
Background
The idea of finding holes by means of seam-following is provided for the first time by the inventor of the present application, natural fractures can be used more efficiently by means of finding holes by means of seam-following, but no relevant technology is available at present for evaluating the specific communication conditions of karst caves and the like which can be achieved by means of the method of finding holes by means of seam-following. The related evaluation method in the prior art aims at the evaluation of the acid fracturing technology, the acid fracturing technology is a fracturing well completion mode commonly used in carbonate rock stratums, the rock fracture pressure can be reduced in the carbonate rock reservoir, the fracture conductivity can be enhanced, the oil drainage volume of unconventional oil and gas reservoirs can be increased, and the oil and gas migration resistance can be reduced, and the method is related to the acid fracturing technology as follows:
at present, research institutes at home and abroad actively seek a mechanical mechanism for representing interaction among multiple fractures, and research on the acidizing fracturing condition through an indoor physical simulation method, but the ordinary simulated rock sample cannot realize the effect of true naked eyes, and the conditions of the development of carbonate rock fractures and karst caves are not considered at the same time.
Further, patent application No. CN201610143414.9 discloses a method for evaluating the acid fracturing effect of carbonate rock, comprising: carrying out shape scanning on the core sample to obtain initial surface roughness; carrying out acid etching treatment on the core sample by using acid liquor to be detected, and then carrying out shape scanning again after the acid etching treatment is finished to obtain surface roughness after the acid etching; calculating the surface roughness difference between the surface roughness of the core sample after acid etching and the initial surface roughness; and comparing the obtained surface roughness difference with a threshold value, thereby evaluating the acid fracturing effect of the acid liquor to be measured.
However, the acid fracturing experimental evaluation method does not consider the establishment of natural fractures and karst caves, and is not suitable for the acid fracturing experimental evaluation method of fracture-cavity oil reservoirs.
Therefore, how to provide a method capable of considering natural cracks and karst caves and evaluating the karst cave communication situation by means of cyclic crack finding becomes a technical problem which needs to be solved by the technical personnel in the field urgently.
Disclosure of Invention
The invention aims to provide an evaluation method capable of considering natural cracks and karst caves and evaluating the karst cave communication condition by means of hole finding along the seams.
The invention provides a method for evaluating a seam following hole finding reconstruction experiment, which comprises the following steps:
fixing a rock sample, wherein the rock sample is a rock sample simulating a fracture-cavity type oil reservoir, and the interior of the rock sample comprises simulated natural fractures and karst caves;
applying confining pressure to the rock sample to simulate triaxial stress;
after the confining pressure is stable, pumping and injecting acid liquor with a fluorescent tracer into the rock sample through a simulated wellhead, wherein the pressure value of the acid liquor at the simulated wellhead is between the pore pressure value of the rock sample and the fracture pressure value of the rock sample, and when the fluorescent tracer is observed at the edge of the rock sample, stopping injecting the acid liquor;
the rock sample is opened and the conditions of natural fractures and vugs are observed.
Preferably, the karst caves in the rock sample comprise a near-well end simulated karst cave and a far-well end simulated karst cave, the near-well end simulated karst cave is a karst cave within a distance d from the simulated well head, and the far-well end simulated karst cave is a karst cave outside the distance d from the simulated well head.
Preferably, the acid solution is a long-time-effect acid solution or a short-time-effect acid solution, the long-time-effect acid solution is corrosive when penetrating into the far-well-end simulated karst cave, the long-time-effect acid solution can be communicated with the simulated natural fractures and the near-well-end simulated karst cave and the far-well-end simulated karst cave, the short-time-effect acid solution is corrosive when penetrating into the near-well-end simulated karst cave, and the short-time-effect acid solution can be communicated with the simulated natural fractures and the near-well-end simulated karst cave.
Preferably, the long-acting acid solution is used for carrying out experiments, and the long-acting acid solution is used for communicating the near-well end karst cave and the far-well end karst cave.
Preferably, the short-aging acid solution or the fracturing fluid is injected through the simulated wellhead at a pressure higher than the fracture pressure value of the rock sample to form an artificial fracture, and then the long-aging acid solution or the short-aging acid solution is injected at a pressure between the pore pressure value of the rock sample and the fracture pressure value of the rock sample to communicate with the far well end karst cave.
Preferably, if the short-aging acid liquid is injected into the artificial fracture, the short-aging acid liquid quickly passes through the artificial fracture to reach the far-end karst cave for communicating with the far-well end.
Preferably, the rock sample is prepared as follows:
preparing a rock sample body by using cement and mineral substances as raw materials, placing a plurality of small cement blocks at any angle in the rock sample body, wherein each small cement block and the plane between the rock sample bodies are used for simulating the plane of a natural crack, and a plurality of spheroids are embedded in the rock sample body and are used for simulating the karst cave.
Preferably, the surface of the small cement block is provided with a filler, so that a plane between the small cement block and the rock sample body has a gap to form the natural fracture.
Preferably, the cement is 325 cement, the mineral substance is silicate, the 325 cement and the 20-40 mesh silicate are prepared into the rock sample body according to the mass ratio of 1:1, and the rock sample body is in a cuboid shape.
Preferably, the length, width and height of the rectangular parallelepiped are 300mm, 300mm and 600mm, respectively, and the length, thickness and width of the block are 60mm, 20mm and 20mm, respectively.
Preferably, the spheroid is the ice-cube, forms the cavity after the ice-cube melts in order to simulate the solution cavity, the quantity of ice-cube is 4, the diameter of ice-cube is 50 mm.
The evaluation method for the circular seam hole-finding reconstruction experiment provided by the invention has the following beneficial effects:
the method comprises the following steps of firstly preparing a rock sample containing natural fractures and karst caves, simulating an oil reservoir with the natural fractures and the karst caves under a real condition, and carrying out an experiment on the rock sample: the three-axis stress is simulated by applying confining pressure, the hole is found by circulating the seam by injecting acid liquor with a fluorescent tracer at a specific pressure value, the condition of the development of the carbonate rock crack and the karst cave is considered, the crack expansion form and the acid liquor etching track can be visually and clearly observed, the research on the carbonate rock acid fracturing crack formation mechanism is facilitated, and the field construction is guided; the limited pressure is between the pore pressure value of the rock sample and the fracture pressure value of the rock sample, so that the acid liquor can be subjected to seam following and hole finding in a low-pressure seepage mode, and the acid liquor is not limited to be subjected to seepage along a specific certain direction.
Preferably, the solution cavity in the rock sample can be divided into a near-well end simulated solution cavity and a far-well end simulated solution cavity, and the specific division distance d can be divided according to the actual size of the rock sample.
Preferably, in the experiment, a long-time-effect acid solution or a short-time-effect acid solution can be selected according to specific conditions, relatively speaking, the price of the short-time-effect acid solution is low, the long-time-effect acid solution and the short-time-effect acid solution used in the place are defined relative to the distance of the simulated cavern, in this case, if the short-time-effect acid solution is selected, the acid solution can be communicated to the simulated cavern at the well-entering end in the rock sample, the acid solution still keeps corrosivity in the process, but for the simulated cavern at the well-far end, the short-time-effect acid solution cannot be communicated, and however, the long-time-effect acid solution can still have corrosivity when the simulated cavern is communicated with the well-far end.
Preferably, the experiment can be performed using a long-acting acid solution, regardless of the price.
Preferably, the artificial crack can be opened, the experiment is carried out by adopting long-term-effect acid liquid or short-term-effect acid liquid, after the artificial crack is opened, if the short-term-effect acid liquid with lower price is adopted, the long-term-effect acid liquid is quickly conveyed to the position near the far well end simulation karst cave at the far end, if the long-term-effect acid liquid is adopted, the conveying speed of the long-term-effect acid liquid in the artificial crack is not considered, the long-term-effect acid liquid can be seeped to the far end from the artificial crack at low speed, and in the process, the long-term-effect acid liquid is not sealed, and the simulation karst cave communicated with the artificial crack can be communicated when the long-term-effect acid liquid passes through the artificial crack.
Preferably, the rock sample body is prepared from cement and mineral substances, the rock sample body is common substances and low in cost, a plurality of spheroid ice blocks are arranged and filled in the rock sample body, and after the rock sample is dried, a cavity is formed to simulate a karst cave.
Preferably, the surface of the small cement block is provided with a filler to form a support, so that natural cracks can be simulated.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a method for evaluating a seam following hole-finding transformation experiment according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a rock sample provided by the present invention.
The reference numerals in fig. 1-2 are as follows:
1 rock sample, 11 rock sample body, 12 natural fracture, 13 karst cave, 14 wellhole.
Detailed Description
As shown in fig. 1-2, fig. 1 is a schematic flow chart of a specific embodiment of a method for evaluating a seam following hole-finding transformation experiment according to the present invention; FIG. 2 is a schematic structural diagram of an embodiment of a rock sample provided by the present invention.
With reference to fig. 1, a method for evaluating a circular seam hole-finding reconstruction experiment comprises the following steps:
fixing a rock sample 1, wherein the rock sample 1 is a rock sample 1 simulating a fracture-cavity type oil reservoir, and the interior of the rock sample 1 comprises natural fractures 12 and karst caves 13;
applying confining pressure to the rock sample 1 to simulate triaxial stress;
after the confining pressure is stable, pumping and injecting acid liquor with a fluorescent tracer into the rock sample 1 through a simulated wellhead (namely a shaft 14 in figure 1), wherein the pressure value of the acid liquor at the simulated wellhead is between the pore pressure value of the rock sample and the fracture pressure value of the rock sample, and stopping injecting the acid liquor when the fluorescent tracer is observed at the edge of the rock sample 1;
the rock sample 1 is opened and the conditions of the natural fractures 12 and the caverns 13 are observed.
The method comprises the steps of firstly preparing a rock sample 1 containing natural fractures 12 and karst caves 13, simulating an oil reservoir with the natural fractures 12 and the karst caves 13 under a real condition, and carrying out an experiment on the rock sample 1: the three-axis stress is simulated by applying confining pressure, the hole is found by circulating the seam by injecting acid liquor with a fluorescent tracer at a specific pressure value, the condition of the development of the carbonate rock crack and the karst cave is considered, the crack expansion form and the acid liquor etching track can be visually and clearly observed, the research on the carbonate rock acid fracturing crack formation mechanism is facilitated, and the field construction is guided; the limited pressure is between the pore pressure value of the rock sample 1 and the fracture pressure value of the rock sample 1, so that the acid liquor can be subjected to seam following and hole finding in a low-pressure seepage mode, and is not limited to the seepage of the acid liquor along a specific certain direction.
In one embodiment, the cavern 13 in the rock sample 1 includes a near-wellbore end simulated cavern and a far-wellbore end simulated cavern, the near-wellbore end simulated cavern is a cavern within a distance d from the simulated wellhead, and the far-wellbore end simulated cavern is a cavern outside the distance d from the simulated wellhead. d can be selected and confirmed according to actual conditions.
Further, the acid solution can be a long-time-effect acid solution or a short-time-effect acid solution, the long-time-effect acid solution still has corrosivity when penetrating into the far-well-end simulated karst cave, the long-time-effect acid solution can be communicated with the simulated natural fractures and the near-well-end simulated karst cave and the far-well-end simulated karst cave, the short-time-effect acid solution has corrosivity when penetrating into the near-well-end simulated karst cave, and the short-time-effect acid solution can be communicated with the simulated natural fractures and the near-well-end simulated karst cave.
The injected acid liquor can be long-acting acid liquor which is still corrosive when penetrating into a rock sample at the farthest position away from the simulated well head; in general, the long acting acid is able to remain corrosive for a longer period of time so that the long acting acid remains corrosive when it penetrates the furthest rock sample 1.
Specifically, the long aging acid liquor is adopted for carrying out experiments, and is used for communicating the near-well end karst cave and the far-well end karst cave.
Certainly, the simulated wellhead injects the short aging acid solution or the fracturing fluid at a pressure higher than the fracture pressure value of the rock sample 1 to form an artificial fracture, and then injects the long aging acid solution or the short aging acid solution at a pressure between the pore pressure value of the rock sample 1 and the fracture pressure value of the rock sample 1 to communicate with the far well end karst cave.
And if the short-aging acid liquid is injected into the artificial fracture, the short-aging acid liquid quickly passes through the artificial fracture to reach the far-end karst cave and is communicated with the far-well end.
In the experiment, long-time-effect acid liquor or short-time-effect acid liquor can be selected according to specific conditions, relatively speaking, the price of the short-time-effect acid liquor is low, the long-time-effect acid liquor and the short-time-effect acid liquor used at the place are defined relative to the distance of a simulated karst cave, under the condition, if the short-time-effect acid liquor is selected, the acid liquor can be communicated to a simulated karst cave at a well inlet end in a rock sample, the acid liquor still keeps corrosivity in the process, but for the simulated karst cave at a well outlet end, the short-time-effect acid liquor cannot be communicated, and the long-time-effect acid liquor still has corrosivity when being communicated with the simulated karst cave at the well outlet end.
If the price is not considered, the long-acting acid liquor can be used for carrying out experiments.
The accessible is seted up artificial crack, adopt long-term effect acidizing fluid or short ageing acidizing fluid to experiment, set up artificial crack after, if adopt the short ageing acidizing fluid of lower price, should carry it near far-end simulation solution cavity of far-end department fast, if adopt long-term effect acidizing fluid, then need not consider its conveying speed in artificial crack, can let it by artificial crack low-speed seepage flow to far-end department can, this in-process, partial long-term effect acidizing fluid can communicate with the simulation solution cavity that artificial crack is linked together when passing through people's crack.
For rock sample 1, it was prepared as follows:
the rock sample body 11 is prepared by using cement and mineral substances as raw materials, a plurality of small cement blocks are placed in the rock sample body 11 at any angle, the plane between each small cement block and the rock sample body 11 is used for simulating the plane of a natural crack 12, a plurality of spheroids are embedded in the rock sample body 11, and the embedded spheroids are used for simulating a karst cave 13 relative to the cement and the mineral substances.
Wherein, small-size cement piece surface is equipped with the filler for the plane between small-size cement piece and the rock specimen body has the gap in order to form natural fracture 12, and the filler can be the grease, coats small-size cement piece surface with inhomogeneous mode.
Further, in a specific embodiment, as shown in fig. 2, the cement is 325 cement, the mineral is silicate, the 325 cement and the 20-40 mesh silicate are prepared into a rock sample body 11 according to a mass ratio of 1:1, and the rock sample body 11 is in a cuboid shape; the length, width and height of the cuboid are 300mm, 300mm and 600mm respectively, and the length, thickness and width of the small cement block are 60mm, 20mm and 20mm respectively.
In this embodiment, the spherical body is an ice cube, the number of ice cubes is 4, and the diameter of the ice cube is 50 mm. Not limited to this, for example, paper balls may be used as the spherical bodies.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method for evaluating a seam following hole finding reconstruction experiment is characterized by comprising the following steps:
fixing a rock sample, wherein the rock sample is a rock sample simulating a fracture-cavity type oil reservoir, and the interior of the rock sample comprises simulated natural fractures and karst caves;
applying confining pressure to the rock sample to simulate triaxial stress;
after the confining pressure is stable, pumping and injecting acid liquor with a fluorescent tracer into the rock sample through a simulated wellhead, wherein the pressure value of the acid liquor at the simulated wellhead is between the pore pressure value of the rock sample and the fracture pressure value of the rock sample, and when the fluorescent tracer is observed at the edge of the rock sample, stopping injecting the acid liquor;
the rock sample is opened and the conditions of natural fractures and vugs are observed.
2. The cyclic cave-finding reconstruction experiment evaluation method of claim 1, wherein the karst caves in the rock sample comprise a near-well end simulated karst cave and a far-well end simulated karst cave, the near-well end simulated karst cave is a karst cave within a distance d from the simulated well head, and the far-well end simulated karst cave is a karst cave outside the distance d from the simulated well head.
3. The cyclic fracture holing improvement experiment evaluation method according to claim 2, wherein the acid solution is a long-acting acid solution or a short-acting acid solution, the long-acting acid solution is corrosive when penetrating into the far-well-end simulated cavern, the long-acting acid solution can cross the simulated natural fracture and can communicate the near-well-end simulated cavern with the far-well-end simulated cavern, the short-acting acid solution is corrosive when penetrating into the near-well-end simulated cavern, and the short-acting acid solution can cross the simulated natural fracture and communicate the near-well-end simulated cavern.
4. The evaluation method for the cyclic hole-finding transformation experiment of claim 3, wherein the long-aging acid solution is used for carrying out the experiment, and the long-aging acid solution is used for communicating the near-well end karst cave and the far-well end karst cave.
5. The evaluation method of the hole-filling and reconstruction experiment of the seam as claimed in claim 3,
and injecting the short-aging acid solution or the fracturing fluid through the simulated wellhead at a pressure higher than the fracture pressure value of the rock sample to form an artificial fracture, and then injecting the long-aging acid solution or the short-aging acid solution at a pressure between the pore pressure value of the rock sample and the fracture pressure value of the rock sample to communicate with the karst cave at the far well end.
6. The cyclic fracture hole-finding reconstruction experiment evaluation method according to claim 5, wherein if the short-aging acid liquid is injected into the artificial fracture, the short-aging acid liquid rapidly passes through the artificial fracture to reach the far-end karst cave communicated with the far-well end.
7. The evaluation method for the seam-filling hole-finding reconstruction experiment as claimed in claim 1, wherein the rock sample is prepared as follows:
preparing a rock sample body by using cement and mineral substances as raw materials, placing a plurality of small cement blocks at any angle in the rock sample body, wherein each small cement block and the plane between the rock sample bodies are used for simulating the plane of a natural crack, and a plurality of spheroids are embedded in the rock sample body and are used for simulating the karst cave.
8. The evaluation method for the slot-filling hole-finding reformation experiment as claimed in claim 7, wherein the surface of the small cement block is provided with a filler, so that a plane between the small cement block and the rock sample body has a gap to form the natural crack.
9. The evaluation method for the cyclic hole-finding reformation experiment as claimed in claim 8, wherein the cement is 325 cement, the mineral substance is silicate, the 325 cement and the 20-40 mesh silicate are prepared into the rock sample body according to a mass ratio of 1:1, and the rock sample body is in a cuboid shape.
10. The experimental evaluation method for seam-filling hole-finding reformation according to claim 9, characterized in that the length, width and height of the rectangular parallelepiped are 300mm, 300mm and 600mm, respectively, and the length, thickness and width of the cement block are 60mm, 20mm and 20mm, respectively.
11. The evaluation method of the experiment of the hole-finding-through-seam modification as claimed in claim 7, wherein the ball-shaped bodies are ice cubes, the ice cubes form cavities after being melted to simulate a karst cave, the number of the ice cubes is 4, and the diameter of the ice cubes is 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011326471.3A CN114544335A (en) | 2020-11-24 | 2020-11-24 | Method for evaluating circular seam hole-finding reconstruction experiment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011326471.3A CN114544335A (en) | 2020-11-24 | 2020-11-24 | Method for evaluating circular seam hole-finding reconstruction experiment |
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