AU2020100250A4 - Indoor stimulation test system for carbon dioxide blast cracking of hot dry rock - Google Patents
Indoor stimulation test system for carbon dioxide blast cracking of hot dry rock Download PDFInfo
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- AU2020100250A4 AU2020100250A4 AU2020100250A AU2020100250A AU2020100250A4 AU 2020100250 A4 AU2020100250 A4 AU 2020100250A4 AU 2020100250 A AU2020100250 A AU 2020100250A AU 2020100250 A AU2020100250 A AU 2020100250A AU 2020100250 A4 AU2020100250 A4 AU 2020100250A4
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- carbon dioxide
- liquid storage
- storage tube
- acoustic emission
- dioxide liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The present invention provides an indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock. The system includes a carbon dioxide pressurizing and filling 5 module, an acoustic emission module and a physical blasting module. The carbon dioxide pressurizing and filling module includes a carbon dioxide storage tank, a gas compressor and a pressurizing pump which are successively connected; the acoustic emission module includes a plurality of acoustic emission probes; the physical blasting module includes a carbon dioxide liquid storage tube, an activator, a shearing piece and a sample placing room; the 0 acoustic emission probes are arranged in the sample placing room; samples are placed in the sample placing room; one end of the carbon dioxide liquid storage tube is connected with the pressurizing pump and the other end thereof is connected with the sample placing room; the carbon dioxide liquid storage tube stores carbon dioxide liquid, and the activator is arranged in the carbon dioxide liquid storage tube; the shearing piece is arranged in the carbon dioxide 5 liquid storage tube; and the carbon dioxide liquid absorbs thermal energy and then rapidly gasifies, with a volume expanded to generate a high pressure to break the shearing piece, and after the shearing piece is broken, high-energy carbon dioxide gas acts on the samples, so that the samples generate cracks. 63 61 8 62 1 Fig. I Fig. 2
Description
INDOOR STIMULATION TEST SYSTEM FOR CARBON DIOXIDE BLAST CRACKING OF HOT DRY ROCK
TECHNICAL FIELD
The present invention relates to the technical field of geothermal energy development of a hot dry rock, and in particular to an indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock.
BACKGROUND OF THE PRESENT INVENTION
The main technical difficulty to exploit geothermal energy of a hot dry rock is poor natural seepage capacity of a thermal reservoir, which should be improved for effective development. Currently, the main method for reservoir reconstruction of the geothermal energy of the hot dry rock is a hydraulic fracturing technology. The technology has achieved some considerable results, but has many problems of low peak pressure, long operation time, serious water filtration, difficult formation of large-scale cracks, and easy induction of microearthquake. Therefore, a new method for establishing a thermal reservoir of the hot dry rock by carbon dioxide blasting is proposed, which provides a new solution to form the thermal reservoir and commercially develop the hot dry rock.
Currently, the new cracking technology lacks of theoretical and practical guidance, and even lacks of relevant demonstration tests. With regard to the carbon dioxide indoor simulation test of the reservoir reconstruction of the hot dry rock, the fracability, fracture pressure and fracturing effect of the hot dry rock body can be determined, which is a reliable and effective means to recognize the crack expansion rule in the hot dry rock and geometrical morphology thereof, and provides good test demonstration for further study.
SUMMARY OF THE PRESENT INVENTION
In view of this, the present invention provides an indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock. An indoor safe and operable blasting test is achieved, with the purpose of simulating a carbon dioxide blast cracking test in different blasting pressure conditions, which solves the difficulty that the carbon dioxide blasting cracking cannot be simulated indoors currently, provides a new way to further study a carbon dioxide blasting cracking technology, and provides a new technical support for exploitation 5 and utilization of the geothermal energy of the dry hot rock.
The present invention provides an indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock. The system includes a carbon dioxide pressurizing and filling module, an acoustic emission module and a physical blasting module. The carbon dioxide pressurizing and filling module includes a carbon dioxide storage tank, a gas compressor and 0 a pressurizing pump which are successively connected. The carbon dioxide storage tank stores carbon dioxide gas, the gas compressor compresses the carbon dioxide gas, and the pressurizing pump pressurizes the carbon dioxide gas to convert the carbon dioxide gas into carbon dioxide liquid. The acoustic emission module includes a plurality of acoustic emission probes. The physical blasting module includes a carbon dioxide liquid storage tube, an 5 activator, a shearing piece and a sample placing room. The acoustic emission probes are arranged in the sample placing room. Samples are placed in the sample placing room, the carbon dioxide liquid storage tube is arranged between the pressurizing pump and the sample placing room, one end of the carbon dioxide liquid storage tube is connected with the pressurizing pump and the other end thereof is connected with the sample placing room, the 20 carbon dioxide liquid storage tube stores carbon dioxide liquid flowing out of the pressurizing pump, and the activator is arranged in the carbon dioxide liquid storage tube and used for providing thermal energy for the carbon dioxide liquid. The shearing piece is arranged in the carbon dioxide liquid storage tube and used for closing a right end of the carbon dioxide liquid storage tube. The carbon dioxide liquid arranged in the carbon dioxide liquid storage 25 tube absorbs thermal energy and then rapidly gasifies, with a volume expanded to generate a high pressure to enable the shearing piece to break, and after the shearing piece is broken, high-energy carbon dioxide gas acts on the samples, so that the samples generate cracks. The acoustic emission probe records crack extension data in a blasting process.
Further, the indoor simulation test system further includes a control device. The control device includes a computer processing system. The acoustic emission module further includes a full information acoustic emission analyzer; an input end of the full information acoustic emission analyzer is connected with the acoustic emission probe; and an output end of the full 5 information acoustic emission analyzer is connected with the computer processing system.
Further, the physical blasting module further includes a pressure sensor. The pressure sensor is used for detecting pressure of the carbon dioxide liquid stored in the carbon dioxide liquid storage tube, and an output end of the pressure sensor is connected with the computer processing system.
Further, a second small hole is formed on a right end of the carbon dioxide liquid storage tube, an annular buckle is arranged at the second small hole, and the shearing piece is installed in the annular buckle. The physical blasting module further includes a leakproof screw ring. The leakproof screw ring locks the annular buckle.
Further, a fourth small hole is formed on a left end of the sample placing room; a third hole is formed at the right end of the carbon dioxide liquid storage tube; the fourth small hole is connected with the third small hole; a metal conduit with two open ends is placed in the fourth small hole; and the metal conduit is inserted into the sample.
The technical solution provided by the present invention has beneficial effects that: the indoor simulation test system provide by the present invention can simulate the carbon 20 dioxide blast cracking test in the different blasting pressure conditions by the cooperation of the carbon dioxide pressurizing and filling module, the acoustic emission module, the physical blasting module and the control device, which facilitates the technicians to study a mechanism of action and a damage failure rule of the carbon dioxide gas blasting. The test demonstrates all kinds of feasible solutions for establishing the thermal reservoir of the hot 25 dry rock by carbon dioxide blasting, which is of great significance for the geothermal energy of the hot dry rock.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a structural schematic diagram of an indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock of the present invention; and
Fig. 2 is a schematic diagram of details of a right end of a carbon dioxide liquid storage 5 tube.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
To make the purpose, technical solution and advantages of the present invention more clear, embodiments of the present invention are further described below in combination with 0 the drawings.
Referring to Fig. 1, embodiments of the present invention provide an indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock, including a carbon dioxide pressurizing and fdling module, an acoustic emission module, a physical blasting module and a control device. The carbon dioxide pressurizing and filling module includes a carbon 5 dioxide storage tank 1, a gas compressor 3 and a pressurizing pump 4. An outlet end of the carbon dioxide storage tank 1 is connected with an inlet end of the gas compressor 3; an outlet end of the gas compressor 3 is connected with an inlet end of the pressurizing pump 4; the carbon dioxide storage tank 1, the gas compressor 3 and the pressurizing pump 4 are connected by a gas pipeline 5; carbon dioxide gas is stored in the carbon dioxide storage tank 20 1; and galvanometers 2 are arranged on left and right ends of the gas pipeline 5 between the carbon dioxide storage tank 1 and the gas compressor 3 and used for detecting the flow of carbon dioxide.
The acoustic emission module includes eights acoustic emission probes 13 and a full information acoustic emission analyzer 18. The acoustic emission probes 13 are electrically 25 connected with the full information acoustic emission analyzer 18 through signal lines 17.
The physical blasting module includes a carbon dioxide liquid storage tube 6, an activator 7, a pressure sensor 8, a shearing piece 9, a leakage proof screw ring 10 and a sample placing room 12. The control device includes a computer processing system 19, and the computer processing system 19 is electrically connected with an output end of the pressure sensor 8 and an output end of the full information acoustic emission analyzer 18.
The interior of the carbon dioxide liquid storage tube 6 is of a hollow structure. A first small hole 61 is formed at an upper part of the left end thereof. One end of a liquid pipeline 5 63 is inserted into the first small hole 61 and the other end of the liquid pipeline 63 is connected to an outlet end of the pressurizing pump 4. Referring to Fig. 2, a second small hole 62 and a third small hole 64 are formed on a right end of the carbon dioxide liquid storage tube 6; the second small hole 62 and the third small hole 64 are communicated with the interior of the carbon dioxide liquid storage tube 6; and the third small hole 64 is close to the 0 second small hole 62. The activator 7, the pressure sensor 8 and the shearing piece 9 are arranged inside the carbon dioxide liquid storage tube 6; the left end of the carbon dioxide liquid storage tube 6 is in a threaded connection with a charging head; the activator 7 is located in the charging head; the pressure sensor 8 is placed inside a pipe wall on the left end of the carbon dioxide liquid storage tube 6; an annular buckle is installed at the second small 5 hole 62; the shearing piece 9 is arranged in the annular buckle; and the annular buckle is locked by a leakproof screw ring 10 and thus closes the right end of the carbon dioxide liquid storage tube 6. In order to ensure the blasting effect, a cavity part on the right end of the carbon dioxide liquid storage tube 6 is designed to be a taper.
The sample placing room 12 is seamlessly connected with the right end of the carbon 20 dioxide liquid storage tube 6 through welding; the acoustic emission probes 13 are evenly distributed on the upper end and the right end of the sample placing room 12; a moving block and a safety lock 16 which are matched are arranged on the right end of the sample placing room 12; and the moving block 15 are movably connected with the sample placing room 12. A sample 11 can be put in the sample placing room 12 by opening the moving block 15, and the sample placing room 12 can be sealed by closing the moving block 15, lowering the lock and fastening the moving block 15 with the lock 16. A fourth small hole 121 is formed on a left end of the sample placing room 12; and the fourth small hole 121 is communicated with the third small hole 64, and has a size matched with a size of the third small hole 64. A metal conduit 14 with two open ends is placed in the fourth small hole 121, and has a diameter consistent with the width of the fourth small hole 121. In order to avoid gas leakage, a sealant can be coated at an air gap between the metal conduit 14 and the fourth small hole 121.
The sample placing room 12 has a suitable size and a cube, and a common large-size 5 sample 11 (300 χ300 x300 mm) can be placed in the sample placing room 12.
A test process of an indoor simulation test system provided by the present embodiment includes:
(1) processing the sample 11: the sample 11 can be a rock cut into a cube or a concrete block grouted and solidified according to a certain sand-stone ratio. In order to ensure that the 0 metal conduit 14 can be freely inserted into the sample 11, a drill hole of 15 cm long can be vertically preset into the sample 11 at a central position of an upper surface of the sample 11, and an open hole section of several centimeters is reserved at the bottom of the hole. The diameter of the drill hole is greater than and consistent with the diameter of the metal conduit 14;
(2) assembling pipelines, and detecting the assembling effect to prevent gas leakage and poor signal transmission, placing the shearing piece 9 on the right end of the carbon dioxide liquid storage tube 6, and rotating the leakproof screw ring 10 upward by virtue of threads to lock the annular buckle;
(3) opening the carbon dioxide storage tank 1 to release carbon dioxide gas, converting carbon dioxide gas into carbon dioxide liquid after compressed by the compressor 3 and pressurized by the pressurizing pump 4 successively, and then flowing into the carbon dioxide liquid storage tube 6; and when the value displayed by the pressure sensor 8 reaches a reset value for carbon dioxide filling, closing the carbon dioxide storage tank 1, and stopping filling;
(4) opening the moving block 15, putting the sample 11 from a right end of the sample placing room 12, inserting the metal conduit 14 into the sample 11 to cause the surface of the sample 11 to fit the acoustic emission probes 13, closing the moving block 15, and lowering the lock 16;
(5) testing: activating the activator 7, wherein the activator 7 generates a lot of thermal energy; the carbon dioxide liquid located in the carbon dioxide liquid storage tube 6 absorbs the thermal energy generated by the activator 7 and gasifies in a very short time, with the volume instantaneously expanded by more than 600 times and high pressure generated; when the pressure reaches a certain limit, the shearing piece 9 is broken, and the high-energy carbon dioxide gas explodes in the metal conduit 14 instantaneously and acts on the sample 11 to cause cracks; the acoustic emission probes 13 records crack expansion data in the blasting process, and transmits the data to the full information acoustic emission analyzer 18 through the signal line 17 in real time; and the full information acoustic emission analyzer 18 analyzes 0 the received signal and then transmits the signal to the computer processing system 19 for further processing; and (6) when the value of the pressure sensor 8 returns to an initial value, finishing the test, opening the moving block 15, taking out the sample 11, observing crack expansion, and summarizing the rule in combination with acoustic emission information.
Directional words such as front, back, upper and lower involved herein are defined by the positions of the parts in the drawings and the mutual positions of the parts, just to express the technical solution clearly and conveniently. It should be understood that the use of the directional words shall not limit the protection scope of the present application.
The above embodiments and the features in the embodiments herein can be combined with each other without conflict.
The above only describes the preferred embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and the principle of the present invention shall be included within the protection scope of the present invention.
It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.
In the claims which follow and in the preceding description of the invention, except
2020100250 20 Feb 2020 where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
Claims (5)
1. An indoor stimulation test system for carbon dioxide blast cracking of a hot dry rock, comprising a carbon dioxide pressurizing and filling module, an acoustic emission module
5 and a physical blasting module, wherein the carbon dioxide pressurizing and filling module comprises a carbon dioxide storage tank, a gas compressor and a pressurizing pump which are successively connected; the carbon dioxide storage tank stores carbon dioxide gas; the gas compressor compresses the carbon dioxide gas; the pressurizing pump pressurizes the carbon dioxide gas to convert the carbon dioxide gas into carbon dioxide liquid; the acoustic
0 emission module comprises a plurality of acoustic emission probes; the physical blasting module comprises a carbon dioxide liquid storage tube, an activator, a shearing piece and a sample placing room; the acoustic emission probes are arranged in the sample placing room; samples are placed in the sample placing room; the carbon dioxide liquid storage tube is arranged between the pressurizing pump and the sample placing room; one end of the carbon
5 dioxide liquid storage tube is connected with the pressurizing pump and the other end thereof is connected with the sample placing room; the carbon dioxide liquid storage tube stores carbon dioxide liquid flowing out of the pressurizing pump, and the activator is arranged in the carbon dioxide liquid storage tube and used for providing thermal energy for the carbon dioxide liquid; the shearing piece is arranged in the carbon dioxide liquid storage tube and 20 used for closing a right end of the carbon dioxide liquid storage tube; the carbon dioxide liquid arranged in the carbon dioxide liquid storage tube absorbs thermal energy and then rapidly gasifies, with a volume expanded to generate a high pressure to break the shearing piece; after the shearing piece is broken, high-energy carbon dioxide gas acts on the samples, so that the samples generate cracks; and the acoustic emission probe records crack extension 25 data in a blasting process.
2. The indoor stimulation test system for carbon dioxide blast cracking of the hot dry rock according to claim 1, wherein the indoor simulation test system further comprises a control device; the control device comprises a computer processing system; the acoustic emission module further comprises a full information acoustic emission analyzer; an input end of the full information acoustic emission analyzer is connected with the acoustic emission probe; and an output end of the full information acoustic emission analyzer is connected with 5 the computer processing system.
3. The indoor stimulation test system for carbon dioxide blast cracking of the hot dry rock according to claim 2, wherein the physical blasting module further comprises a pressure sensor; the pressure sensor is used for detecting pressure of the carbon dioxide liquid stored in
0 the carbon dioxide liquid storage tube; and an output end of the pressure sensor is connected with the computer processing system.
4. The indoor stimulation test system for carbon dioxide blast cracking of the hot dry rock according to claim 1, wherein a second small hole is formed on a right end of the carbon
5 dioxide liquid storage tube; an annular buckle is arranged at the second small hole; the shearing piece is installed in the annular buckle; the physical blasting module further comprises a leakproof screw ring; and the leakproof screw ring locks the annular buckle.
5. The indoor stimulation test system for carbon dioxide blast cracking of the hot dry
20 rock according to claim 1, wherein a fourth small hole is formed on a left end of the sample placing room; a third hole is formed at the right end of the carbon dioxide liquid storage tube; the fourth small hole is connected with the third small hole; a metal conduit with two open ends is placed in the fourth small hole; and the metal conduit is inserted into the sample.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910481068.9A CN110346532A (en) | 2019-06-04 | 2019-06-04 | A kind of simulation laboratory test system using carbon dioxide blast cracking hot dry rock |
| CN201910481068.9 | 2019-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020100250A4 true AU2020100250A4 (en) | 2020-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020100250A Ceased AU2020100250A4 (en) | 2019-06-04 | 2020-02-20 | Indoor stimulation test system for carbon dioxide blast cracking of hot dry rock |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN110346532A (en) |
| AU (1) | AU2020100250A4 (en) |
| ZA (1) | ZA202001127B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514337B (en) * | 2020-04-09 | 2022-07-29 | 新奥科技发展有限公司 | Hot dry rock rupture pressure test device and method |
| CN113376034B (en) * | 2021-06-10 | 2023-10-20 | 河南理工大学 | Simulated formation borehole CO 2 System for testing breaking mechanism of fractured rock sample |
| CN114264551B (en) * | 2021-11-24 | 2023-12-12 | 合肥通用机械研究院有限公司 | Explosion test method and explosion test system for pressure vessel |
| CN114152731A (en) * | 2021-12-15 | 2022-03-08 | 石家庄铁道大学 | Uranium ore carbon dioxide blasting and carbon dioxide and oxygen ground immersion mining test device |
| CN114769832A (en) * | 2022-06-10 | 2022-07-22 | 郑州宇光复合材料有限公司 | Carbon dioxide physical explosion welding device and welding method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6668554B1 (en) * | 1999-09-10 | 2003-12-30 | The Regents Of The University Of California | Geothermal energy production with supercritical fluids |
| US7343975B2 (en) * | 2005-09-06 | 2008-03-18 | Halliburton Energy Services, Inc. | Method for stimulating a well |
| CN106703773A (en) * | 2015-08-03 | 2017-05-24 | 中国矿业大学 | Liquid carbon dioxide bomb, propping agent blasting anti-reflection method and device |
| CN107905778A (en) * | 2017-10-19 | 2018-04-13 | 中国石油大学(华东) | Supercritical CO2The enhanced geothermal system experimental provision of fluid fracturing and method |
| CN207585444U (en) * | 2017-11-13 | 2018-07-06 | 河北石探机械制造有限责任公司 | Carbon dioxide fracturing device |
| CN108729915A (en) * | 2018-04-24 | 2018-11-02 | 中国地质大学（武汉） | A kind of carbon dioxide deep-well fracturing device and its application process |
-
2019
- 2019-06-04 CN CN201910481068.9A patent/CN110346532A/en active Pending
-
2020
- 2020-02-20 AU AU2020100250A patent/AU2020100250A4/en not_active Ceased
- 2020-02-24 ZA ZA202001127A patent/ZA202001127B/en unknown
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| Publication number | Publication date |
|---|---|
| CN110346532A (en) | 2019-10-18 |
| ZA202001127B (en) | 2020-11-25 |
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| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |