CN104374637B - Water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition - Google Patents
Water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition Download PDFInfo
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- CN104374637B CN104374637B CN201410610735.6A CN201410610735A CN104374637B CN 104374637 B CN104374637 B CN 104374637B CN 201410610735 A CN201410610735 A CN 201410610735A CN 104374637 B CN104374637 B CN 104374637B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 238000007789 sealing Methods 0.000 title claims abstract description 83
- 238000002474 experimental method Methods 0.000 title claims abstract description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000002184 metal Substances 0.000 claims abstract description 77
- 229910052751 metal Inorganic materials 0.000 claims abstract description 77
- 239000011435 rock Substances 0.000 claims abstract description 42
- 229910052802 copper Inorganic materials 0.000 claims abstract description 35
- 239000010949 copper Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 9
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 description 5
- 239000003566 sealing material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition. The water sealing device comprises a hole sealing nut, a metal water pipe, a locking nut, metal washers and wedge-shaped sealing red copper rings, wherein the wedge-shaped sealing red copper rings sleeve the metal water pipe which extends into drill hole inside a rock sample, are partitioned by the metal washers, and each wedge-shaped sealing red copper ring is formed by oppositely buckling two copper seals with slopes; the inner surface and the outer surface of each wedge-shaped sealing red copper ring are vertical surfaces; the wedge-shaped sealing red copper rings expand in a tester under the condition that the maximum temperature can reach 600 DEG C; the inner vertical surfaces and the outer vertical surfaces are used for pressing the metal water pipe and rock hole wall respectively, so that the initial hole sealing is implemented; the wedge-shaped sealing red copper rings are pressed and deformed to expand in the process of applying load to the rock sample by the tester; the outer vertical surfaces are on close contact with the hole wall of the rock sample; the inner vertical surface is in close contact with the metal water pipe, so that the high-pressure water sealing in the experiment process is implemented. According to the water sealing device, the wedge-shaped sealing red copper rings are additionally arranged outside the metal water pipe, so that the water sealing under the high-temperature, high-load and high-pressure condition is realized; the device is simple in structure, reliable in performance and high in stability, and is applied to the hydraulic fracture experiment of the rock under the high-temperature and high-pressure condition.
Description
Technical Field
The invention relates to a water sealing device for a hydraulic fracturing experiment, in particular to a water sealing device suitable for a rock sample in the hydraulic fracturing experiment under the conditions of high temperature and high pressure.
Background
In recent years, in the process of exploiting geothermal heat, the construction of a manual circulation storage layer is a key and difficult point of the whole project, and the construction method is giant hydraulic fracturing. At present, a plurality of problems such as fracture initiation pressure, a crack propagation regulation and the like are worthy of further research. The research means mainly adopts theoretical research and numerical calculation methods. However, both of the two research means can not truly reflect the actual environment of the field engineering, and due to the complexity of the boundary conditions, no effective equipment and method can be used for carrying out laboratory experiments at present. Therefore, an apparatus and method for conducting laboratory research on hydraulic fracturing of granite at high temperature and high pressure have been devised.
In the development process of the device, a high-pressure water jet device is used for providing high-pressure water with the pressure of 400MPa at most as a pressure source for hydraulic fracturing. The sealing of high-pressure water in the rock is a key technology which needs to be solved in the design of a rock hydraulic fracturing experiment and is also a decisive factor for the success of the related experiment.
The water sealing technology adopted in the current hydraulic fracturing experiment is relatively backward, a drilling hole sealing material is mostly adopted for sealing, and cement mortar and polyurethane are mainly adopted as the sealing material for fracturing the drilling hole. The former is easy to shrink after hole sealing, so that the water leakage phenomenon occurs at the joint of the material and the hole wall, and the effect of pressure relief and permeability increase measures is directly influenced; the latter has high material price and poor compression resistance, and can only meet the compression resistance requirement of the common hydraulic fracturing technology. In summary, the conventional water sealing method cannot be used under high temperature and high pressure. Under the water pressure of 400MPa, large-flow leakage can also occur in a tiny gap, so that the water pressure cannot be loaded to the target pressure.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a water sealing device based on a water fracturing experiment under high-temperature and high-pressure conditions, which has the advantages of simple structure, high temperature resistance, low price and good sealing effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention discloses a water sealing device based on a rock sample hydraulic fracturing experiment in a high-temperature and high-pressure environment.
The wedge-shaped sealing red copper ring comprises a wedge-shaped upper red copper seal and a wedge-shaped lower red copper seal which is combined with the upper red copper seal.
The metal gasket is a cylindrical ring body, the diameter of the inner ring of the metal gasket is slightly larger than the outer diameter of the metal water pipe, and the diameter of the outer ring of the metal gasket is slightly smaller than the aperture of the blind hole of the rock sample.
The metal water pipe is a stepped steel casting, a first thread is machined at a first step in the middle of the metal water pipe, a second thread is arranged at a second step on the upper portion of the metal water pipe, the outer diameter of the first thread is equal to the outer diameter of the water pipe at the lower portion of the metal water pipe, and the outer diameter of the second thread is equal to the outer diameter of the water pipe in the middle of the metal water pipe; the locking nut is matched with the middle thread of the metal water pipe, and the hole sealing nut is matched with the thread of the top thread of the metal water pipe.
The metal gaskets and the wedge-shaped sealing red copper rings which are sleeved at intervals form 2-4 groups.
Has the advantages that: according to the invention, the wedge-shaped sealing red copper ring is additionally arranged, and when the wedge-shaped sealing red copper ring is preassembled, pressure is applied to the wedge-shaped sealing red copper ring, so that the wedge-shaped sealing red copper ring is tightly attached to the wall of the rock hole. Along with the temperature rise of the laboratory, when the wedge-shaped sealing red copper ring and the rock expand under heating, the red copper ring and the rock further cling to each other due to the fact that the expansion coefficient of the red copper ring is larger than that of the rock. When high-pressure water is injected, the water pressure extrudes the copper seal below the wedge-shaped sealing red copper ring from the lower part of the wedge-shaped sealing red copper ring, so that the copper seal moves upwards and generates a movement along the copper seal contact inclined plane with the upper copper seal, and under the condition that the temperature in the tester can reach the highest temperature of 600 ℃, the red copper is softer and easier to deform, so that the wedge-shaped sealing red copper ring expands and plays a hole sealing role, the defect that the traditional water sealing material or method fails in a high-temperature and high-pressure environment is overcome, the water sealing material is particularly suitable for a high-temperature and high-pressure working environment, and the water sealing material has the advantages of good sealing effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a wedge-shaped sealing red copper ring of the present invention;
FIG. 3 is a schematic structural view of a metal water pipe according to the present invention;
fig. 4 is a schematic view of the structure of the metal water pipe of the present invention.
In the figure: 1. hole sealing nuts; 2. a metal water pipe; 3. locking the nut; 4. a rock sample; 5. a metal washer; 6. sealing the red copper ring in a wedge shape; 2-1, threading the middle part of the metal water pipe; 2-2, threading the top of the metal water pipe; 6-1, sealing copper seal above the red copper ring in a wedge shape; 6-2, sealing the copper seal below the red copper ring in a wedge shape.
Detailed Description
An embodiment of the invention is further described below with reference to the accompanying drawings:
as shown in figure 1, the water sealing device based on the rock sample hydraulic fracturing experiment in the high-temperature and high-pressure environment mainly comprises a hole sealing nut 1, a metal water pipe 2, a locking nut 3, a rock sample 4, a metal washer 5 and a wedge-shaped sealing red copper ring 6. A blind hole is formed in a rock sample 4, a metal water pipe 2 is inserted into the blind hole of the rock sample 4, a plurality of metal gaskets 5 and wedge-shaped sealing red copper rings 6 are sleeved on the metal water pipe 2 in the blind hole at intervals, locking nuts 3 matched with the metal water pipe 2 are arranged on the plurality of metal gaskets 5 and the wedge-shaped sealing red copper rings 6, and a hole sealing nut 1 for sealing an orifice of the rock sample 4 is arranged at the exposed end of the metal water pipe 2; the plurality of metal gaskets 5 and the wedge-shaped sealing red copper rings 6 which are sleeved at intervals are 2-4 groups, and 3 groups are shown in figure 1.
Fig. 2 is a structural schematic diagram of the wedge-shaped sealing red copper ring 6. The wedge-shaped sealing red copper ring 6 comprises a wedge-shaped upper red copper seal 6-1 and a wedge-shaped lower red copper seal 6-2 which is combined with the upper red copper seal 6-1. The wedge-shaped sealing red copper ring 6 is structurally characterized in that two copper seals with inclined planes are buckled with each other, and comprises an upper copper seal 6-1 and a lower copper seal 6-2. The outer edge surface of the lower copper seal 6-2 is a vertical surface and is tightly attached to the hole wall of the drill hole of the rock sample 4, and the inner edge surface is an inclined surface. The outer edge surface of the upper copper seal 6-1 is an inclined surface, the slope is the same as that of the lower copper seal 6-2, the inclined surfaces of the two copper seals can be in close contact when the two copper seals are buckled, and the inner edge surface is vertical and can be in close contact with the metal water pipe 2. The metal gasket 5 is a cylindrical ring body, the diameter of the inner ring of the metal gasket 5 is slightly larger than the outer diameter of the metal water pipe 2, and the diameter of the outer ring of the metal gasket 5 is slightly smaller than the hole diameter of the drill hole of the rock sample 4. The upper part and the lower part of the wedge-shaped sealing red copper ring are provided with metal gaskets 5 which can respectively abut against an upper copper seal 6-1 and a lower copper seal 6-2, when the wedge-shaped sealing red copper ring is installed, the upper copper seal 6-1 and the lower copper seal are relatively moved along the inclined plane by pressing the upper metal gasket 5, the upper copper seal 6-1 expands inwards to press the metal water pipe 2, and the lower copper seal 6-2 expands outwards to press the hole wall of a drill hole of a rock sample 4.
The metal water pipe 2 is a step-shaped steel casting, a first step in the middle of the metal water pipe 2 is provided with a first thread 2-1, a second step on the upper part of the metal water pipe 2 is provided with a second thread 2-2, the outer diameter of the first thread 2-1 is equal to the outer diameter of the water pipe on the lower part of the metal water pipe 2, and the outer diameter of the second thread 2-2 is equal to the outer diameter of the water pipe in the middle of the metal water pipe 2; the locking nut 3 is matched with the middle thread 2-1 of the metal water pipe 2, and the hole sealing nut 1 is matched with the thread of the top thread of the metal water pipe.
When in use, firstly the size isThe center of the end face of the rock sample 4 was drilled with a hole having a diameter of 25mm and a depth of 210mm, the metal washer 5 was inserted into the hole, and the metal water pipe 2 was inserted into the hole. The wedge-shaped sealing red copper ring 6 penetrates through the metal water pipe 2 in sequence and is placed into the hole, the metal gasket 5 is placed on the wedge-shaped sealing red copper ring, and the metal gasket 5 is pressed by a tool, so that the wedge-shaped sealing red copper ring 6 expands to tightly press the hole walls of the metal water pipe 2 and the rock sample 4. And sequentially loading the second wedge-shaped sealing red copper ring 6 and the third wedge-shaped sealing red copper ring 6 according to the method, screwing the locking nut 3 and the hole sealing nut 1 on the surface of the metal water pipe 2 after the three wedge-shaped sealing red copper rings 6 are loaded, and pressing the rock sample 4. During the experiment, the rock sample 4 provided with the water sealing device is arranged in the pressure chamber, then high-pressure water is injected from the top of the metal water pipe 2, the high-pressure water penetrates into cracks of the rock sample 4 along the metal water pipe 2, the wedge-shaped sealing red copper ring 6 and the rock sample 4 expand along with the rise of the temperature, and the expansion coefficient of the wedge-shaped sealing red copper ring 6 is larger than that of the rock sample 4, so that the wedge-shaped sealing red copper ring and the rock sample 4 are further attached tightly. And then the water pressure is injected by the metal water pipe 2, and the water pressure extrudes the lower copper seal 6-2 from the lower part of the wedge-shaped seal red copper ring 6, so that the lower copper seal moves upwards and generates relative movement with the upper copper seal 6-1 along the inclined plane. And under high temperature, the red copper becomes soft and is easier to deform, so that the wedge-shaped sealing red copper ring 6 expands and plays a hole sealing role, and high-pressure water is concentrated to act on the cracks of the rock sample 4 to break the rock sample 4.
Claims (5)
1. The utility model provides a water sealing device based on rock sample hydraulic fracturing experiment under high temperature high pressure environment which characterized in that: the device comprises a rock sample (4) with a blind hole, a metal water pipe (2) is inserted into the blind hole of the rock sample (4), a plurality of metal gaskets (5) and wedge-shaped sealing red copper rings (6) are sleeved on the metal water pipe (2) in the blind hole at intervals, locking nuts (3) matched with the metal water pipe (2) are arranged on the plurality of metal gaskets (5) and the wedge-shaped sealing red copper rings (6), and hole sealing nuts (1) for sealing orifices of the rock sample (4) are arranged on exposed ends of the metal water pipe (2).
2. The water sealing device based on the rock sample hydraulic fracturing experiment under the high-temperature and high-pressure environment as claimed in claim 1, is characterized in that: the wedge-shaped sealing red copper ring (6) comprises a wedge-shaped upper red copper seal (6-1) and a wedge-shaped lower red copper seal (6-2) which can be combined with the upper red copper seal (6-1).
3. The water sealing device based on the rock sample hydraulic fracturing experiment under the high-temperature and high-pressure environment as claimed in claim 1, is characterized in that: the metal gasket (5) is a cylindrical ring body, the diameter of the inner ring of the metal gasket (5) is slightly larger than the outer diameter of the metal water pipe (2), and the diameter of the outer ring of the metal gasket (5) is slightly smaller than the hole diameter of the drill hole of the rock sample (4).
4. The water sealing device based on the rock sample hydraulic fracturing experiment under the high-temperature and high-pressure environment as claimed in claim 1, is characterized in that: the metal water pipe (2) is a stepped steel casting, a first thread (2-1) is machined at a first step in the middle of the metal water pipe (2), a second thread (2-2) is arranged at a second step on the upper portion of the metal water pipe (2), the outer diameter of the first thread (2-1) is equal to the outer diameter of the water pipe at the lower portion of the metal water pipe (2), and the outer diameter of the second thread (2-2) is equal to the outer diameter of the water pipe in the middle of the metal water pipe (2); the locking nut (3) is matched with a first (2-1) thread in the middle of the metal water pipe (2), and the hole sealing nut (1) is matched with a thread on the top of the metal water pipe.
5. The water sealing device based on the rock sample hydraulic fracturing experiment under the high-temperature and high-pressure environment as claimed in claim 1, is characterized in that: the metal gaskets (5) and the wedge-shaped sealing red copper ring (6) which are sleeved at intervals form 2-4 groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410610735.6A CN104374637B (en) | 2014-11-03 | 2014-11-03 | Water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410610735.6A CN104374637B (en) | 2014-11-03 | 2014-11-03 | Water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition |
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| Publication Number | Publication Date |
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| CN104374637A CN104374637A (en) | 2015-02-25 |
| CN104374637B true CN104374637B (en) | 2017-01-11 |
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| CN201410610735.6A Active CN104374637B (en) | 2014-11-03 | 2014-11-03 | Water sealing device applied to hydraulic fracture experiment under high-temperature and high-pressure condition |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109752249B (en) * | 2019-01-22 | 2024-02-27 | 北京交通大学 | Sealing device and sealing method for sample and grouting base in triaxial mud water splitting test |
| CN109870350B (en) * | 2019-03-29 | 2023-10-27 | 中国矿业大学 | Liquid leakage prevention high-temperature high-pressure hydraulic fracturing system and test method |
| CN109870349B (en) * | 2019-03-29 | 2023-10-27 | 中国矿业大学 | High-temperature high-pressure hydraulic fracturing clamp holder and test method thereof |
| CN110501235A (en) * | 2019-09-24 | 2019-11-26 | 中国工程物理研究院化工材料研究所 | A kind of fragile material tensile strength test macro and method based on fracture caused by hydraulic pressure method |
| CN110514528A (en) * | 2019-09-24 | 2019-11-29 | 中国工程物理研究院化工材料研究所 | A kind of test macro and method of explosive structural member tensile strength distribution situation |
| US11287361B2 (en) | 2020-03-30 | 2022-03-29 | Stratum Reservoir Intermediate, LLC | System and device for analyzing fluid flow in unconventional hydraulically-fractured porous media |
| CN113218773B (en) * | 2021-04-13 | 2024-06-18 | 天津成源化工设备有限公司 | Hydraulic fracture stress detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63235863A (en) * | 1987-03-25 | 1988-09-30 | Central Res Inst Of Electric Power Ind | Initial rock pressure measurement by hydraulic crushing |
| JP2737367B2 (en) * | 1990-06-13 | 1998-04-08 | 三菱マテリアル株式会社 | High-temperature and high-pressure test equipment for rock samples |
| CN201749062U (en) * | 2010-08-25 | 2011-02-16 | 安徽理工大学 | Test device of rock fracture rupture process under action of high confined water |
| CN202330181U (en) * | 2011-12-06 | 2012-07-11 | 湖南科技大学 | Hydraulic fracturing device for crack-containing rock-like materials |
| CN103196762B (en) * | 2013-04-25 | 2014-10-15 | 重庆地质矿产研究院 | Experimental device and method for reforming shale gas reservoir through pulse hydraulic fracturing |
| CN204154571U (en) * | 2014-11-03 | 2015-02-11 | 中国矿业大学 | Based on the water sealing device of Hydraulic Fracturing Experiment under high-temperature and high-pressure conditions |
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Address after: 221116 Research Institute of China University of Mining and Technology,, Jiangsu Applicant after: China University of Mining & Technology Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant before: China University of Mining & Technology |
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