CN216594692U - Rock acid-etching crack permeability testing device - Google Patents
Rock acid-etching crack permeability testing device Download PDFInfo
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- CN216594692U CN216594692U CN202123285067.9U CN202123285067U CN216594692U CN 216594692 U CN216594692 U CN 216594692U CN 202123285067 U CN202123285067 U CN 202123285067U CN 216594692 U CN216594692 U CN 216594692U
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- 239000011435 rock Substances 0.000 title claims abstract description 108
- 230000035699 permeability Effects 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 238000005530 etching Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
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- 238000010998 test method Methods 0.000 description 2
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Abstract
The utility model discloses a rock acid-etching crack permeability testing device, which comprises a confining pressure chamber, wherein a pair of rock samples are arranged in the confining pressure chamber, a straight crack is arranged between the rock samples, the rock samples are semi-cylindrical, and the longitudinal side edges of the rock samples are attached to each other; the top cracks between the pair of rock samples are connected with the liquid drainage mechanism, and the bottom cracks between the pair of rock samples are connected with the liquid supply mechanism. Rock crack acidizing etching test and permeability test under the operating condition can be carried out to this application, and the inhomogeneous surface is corroded to the crack wall face of different velocity of flow rock samples of different velocity of flow acid solutions flow through, recycles this device, regards water as measuring the permeability medium, measures its rock acid corrosion crack's permeability. The effect of accurately obtaining the acid-etched fracture of the rock is achieved, and the research on the permeability of the acid-etched fracture can be completed simultaneously.
Description
Technical Field
The utility model relates to a deep geothermal resource development technical field specifically is a rock acid corrosion crack permeability testing arrangement.
Background
At present, the construction and development of rock geothermal reservoirs are still in a development stage, and related researches on reservoir exploitation are made by departments such as petroleum, geology, water conservancy and the like in China, so that the development of geothermal exploration and development engineering is promoted to a certain extent. However, in the aspects of rock occurrence environment, engineering construction process, production requirements and the like, the geothermal engineering has great difference with the petroleum, geological, water conservancy and other engineering, and certain errors can be brought to the research on the utilization of the heat energy of the rock in the thermal reservoir of the geothermal engineering.
Acid fracturing is an important means for increasing the yield of rock thermal reservoirs, and in order to promote the development of thermal reservoirs and improve the development potential of the reservoirs, the acid erosion process of acid liquor in fracture pores needs to be determined. After the rock is acidified, the rock cracks are subjected to non-uniform corrosion reaction, and a certain opening degree is kept under the action of stratum closing stress to form an acidified corrosion artificial crack with convection capacity, so that the effects of improving reservoir convection conditions and increasing the geothermal energy exploitation rate are achieved. A thorough understanding of heat transfer behavior in complex fracture networks is crucial for geothermal reservoir development.
The conventional rock crack permeability test is to perform permeability test on a prefabricated crack or a complete rock sample of the rock sample by using distilled water as a medium at normal temperature and normal pressure. However, this does not simulate the actual deep formation environment and in field projects deep rock is first subjected to acid etching.
Obviously, according to the conventional crack permeability test, the obtained crack heat exchange is not ideal in the real implementation process. The specific disadvantages of the prior art are as follows: 1. rock acid-etched cracks cannot be obtained under the conditions of high temperature and high confining pressure in actual working conditions; 2. the space structure of the existing instrument can not reasonably realize the accurate measurement of the permeability of the acid-etched fractured rock.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rock acid corrosion crack permeability testing arrangement has solved among the prior art and can't the accuracy acquire rock acid corrosion crack, is difficult to study the technical problem of acid corrosion crack's permeability.
In order to achieve the above object, the utility model provides a following technical scheme: a rock acid-etching crack permeability testing device comprises a confining pressure chamber, wherein a pair of rock samples are arranged in the confining pressure chamber, a straight crack is arranged between the rock samples, the rock samples are semi-cylindrical, and the longitudinal side edges of the rock samples are attached to each other; the top cracks between the pair of rock samples are connected with a liquid drainage mechanism, and the bottom cracks between the pair of rock samples are connected with a liquid supply mechanism;
the liquid supply mechanism is provided with a metering pump, the metering pump is connected with a bottom crack between the pair of rock samples through a water supply pipe, and an upstream metering bottle and a first pressure sensor are arranged on the water supply pipe;
the drainage mechanism is provided with a drainage pool, the drainage pool is connected with a top crack between a pair of rock samples through a drainage pipe, and the drainage pipe is provided with a downstream metering bottle and a second pressure sensor;
the metering pump, the first pressure sensor and the second pressure sensor are respectively connected with the controller through electric signals;
the lower side wall of the confining pressure chamber is provided with a base.
Compared with the prior art, the beneficial effects of the utility model are that:
the permeability is one of the most important parameters in reservoir physical property characteristic research, and the measurement of the rock acid-eroded fracture permeability is an essential work for reservoir evaluation and capacity rating, and can be used for predicting the water storage capacity of a geothermal reservoir and the hot water yield of a conventional geothermal system. Rock crack acidizing etching test and permeability test under the operating condition can be carried out to this application, and the inhomogeneous surface is corroded to the crack wall face of different velocity of flow rock samples of different velocity of flow acid solutions flow through, recycles this device, regards water as measuring the permeability medium, measures its rock acid corrosion crack's permeability. The method achieves the effect of accurately obtaining the acid-etched fracture of the rock, and can complete the research on the permeability of the acid-etched fracture at the same time.
Drawings
Fig. 1 is the utility model discloses a rock acid-etching crack permeability testing arrangement's schematic structure diagram.
Fig. 2 is a schematic diagram of the mechanism of the acidification etching and crack heat exchange of the present invention.
Fig. 3 is the utility model discloses a rock acid etching crack permeability testing arrangement's device schematic diagram.
1. Sampling rock; 2. a confining pressure chamber; 3. a heater; 4. a liquid supply mechanism; 5. a liquid discharge mechanism; 6. a metering pump; 7. a controller; 8. thermal shrinkage sleeving; 9. a clamping mechanism; 10. cushion blocks; 11. a base plate; 12. a base; 13. an upstream metering bottle; 14. a first pressure sensor; 15. a drainage basin; 16. a downstream metering bottle; 17. a second pressure sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a rock acid-etching crack permeability testing device comprises a confining pressure chamber 2, wherein a pair of rock samples 1 are arranged in the confining pressure chamber 2, a straight crack is arranged between the pair of rock samples 1, the pair of rock samples 1 are semi-cylindrical, and the longitudinal side edges of the pair of rock samples 1 are attached to each other; the top cracks between the pair of rock samples 1 are connected with a liquid drainage mechanism 5, and the bottom cracks between the pair of rock samples 1 are connected with a liquid supply mechanism 4;
the liquid supply mechanism 4 is provided with a metering pump 6, the metering pump 6 is connected with a bottom crack between the rock samples 1 through a water supply pipe, and the water supply pipe is provided with an upstream metering bottle 13 and a first pressure sensor 14;
the drainage mechanism 5 is provided with a drainage pool 15, the drainage pool 15 is connected with a top crack between the pair of rock samples 1 through a drainage pipe, and the drainage pipe is provided with a downstream metering bottle 16 and a second pressure sensor 17;
the metering pump 6, the first pressure sensor 14 and the second pressure sensor 17 are respectively connected with the controller 7 through electric signals;
the lower side wall of the confining pressure chamber 2 is provided with a base 12.
The utility model also provides a rock acid etching crack permeability testing arrangement and crack acid etching method: the outer side wall of the confining pressure chamber 2 is additionally provided with a heater 3, and the confining pressure chamber 2 is filled with high-temperature-resistant silicon oil.
According to the method, a rock sample 1 is placed in a confining pressure chamber 2, a water supply mechanism 4 supplies acid liquor to a water inlet of a straight crack through a metering pump 6, the metering pump 6 sends a flow signal to a controller 7, a drainage mechanism 5 discharges the acid liquor in the crack, and the concentration of the acid liquor is set, so that irregular rock cracks under different concentrations are etched;
meanwhile, high-temperature-resistant silicon oil is injected into the confining pressure chamber 2, the heater 3 heats the confining pressure chamber 2, and under the conditions of real working condition temperature and confining pressure, the straight crack of the rock is accurately acidified and etched, and the acidification process of the deep rock crack is truly simulated.
The working principle is as follows: because rock specimen 1 sets up the inner chamber at confined pressure chamber 2, heater 3 is fixed to be set up at confined pressure chamber 2's outer wall, supplies liquid mechanism 4 and fissured water inlet intercommunication, and fissured water inlet setting is in rock specimen 1's bottom, and measuring pump 6 sets up on supplying liquid mechanism 4, and drainage mechanism 5 and fissured delivery port intercommunication, fissured delivery port setting are at rock specimen 1's top. Therefore, when the straight fractured rock is to be acidized and etched, the rock sample 1 is placed into the confining pressure chamber, the liquid supply mechanism 4 supplies acid liquid to the water inlet of the fracture through the metering pump 6, the metering pump 6 sends a flow signal to the controller 7, and the liquid discharge mechanism 5 discharges the acid liquid in the fracture. Meanwhile, high-temperature-resistant silicone oil is injected into the confining pressure chamber 2, the heater 3 heats the confining pressure chamber 2, and the confining pressure control device applies confining pressure to the rock sample in the confining pressure chamber 2. Under the conditions of real working condition temperature and confining pressure, the straight crack of the rock is accurately acidized and etched, and the acidizing process of the deep rock crack is truly simulated.
The utility model also provides a rock acid corrosion crack permeability testing arrangement and permeability test method: arranging thermal shrinkable sleeves 8 on the outer side walls of the pair of rock samples 1; the clamping mechanism 9 is arranged on the upper side wall of the confining pressure chamber 2, and the output end of the clamping mechanism 9 penetrates through the upper side wall of the confining pressure chamber 2 and is used for fixing the rock sample 1, so that the rock sample 1 is prevented from acting during an experiment, and the precision of an experiment result is ensured; a cushion block 10 is arranged between the output end of the clamping mechanism 9 and the pair of rock samples 1; be equipped with backing plate 11 between the lower lateral wall of confining pressure room 2 and a pair of rock specimen 1, and backing plate 11 all is equipped with the through-hole with cushion 10, guarantees that the liquid for the measurement can pass through smoothly. Through the setting of cushion 10 and backing plate 11, further guarantee the stability of rock specimen 1 in the experiment, guarantee that the experimental result is not influenced.
Dipping alcohol with a cotton swab, wiping the edges of the two rock bodies 1 to remove floating dust, wherein the wiping area is larger than the pasting area, after the alcohol is dried, the edges of the opposite surfaces of the rock samples 1 are fixed through a sealant, and the dimension of the pair of fixed rock samples 1 is a cylinder with the diameter of phi 50 multiplied by 100 mm. The processing standard refers to the GB/T50266 and 2013 engineering rock mass test method standard. The processed rock sample 1 has smooth surface and good integrity.
The method comprises the steps of fixedly connecting the edges of the opposite surfaces of a rock sample 1 by using a sealant, standing for 12 hours, only reserving a crack position, putting the rock sample into a heat-shrinkable sleeve 8, heating by using a hot air gun, and shrinking and fixing the rock sample by using the heat-shrinkable sleeve 8; placing the rock sample 1 into a confining pressure chamber 2, setting the temperature and confining pressure according to the actual working condition requirements, then setting the flow of a metering pump 6, starting, and carrying out permeability test;
the metering pump 6 pumps water in the water supply tank, supplies the water to the water inlet of the crack through a water supply pipe, and enters the rock sample 1 through the water inlet of the crack; the water after seepage enters the drainage pool 15 through a drainage pipe, and is collected through the drainage pool 15; the output end of the clamping mechanism 9 passes through the confining pressure chamber 2 and contacts with the top of the rock sample 1;
the controller 7 obtains the permeability coefficient of the rock sample according to the pressure signal of the first pressure sensor 14, the pressure signal of the second pressure sensor 17 and the volumes of the upstream measuring bottle 13 and the downstream measuring bottle 16:
and (3) testing the permeability by adopting a pressure pulse method, wherein the permeability calculation formula is as follows:
wherein k is the permeability (m) of the sample2) (ii) a Δ p (t) is the pressure difference between the upstream and downstream sides of the sample at time t; mu is the dynamic viscosity coefficient of water; c is the compression coefficient of water at normal temperature; l and A are the height (m) and cross-sectional area (m) of the sample, respectively2)；ViAnd V0Volume (m) of the upstream and downstream containers, respectively3)。
The working principle is as follows: when carrying out the permeability test to rock acid-etched crack, use sealed glue (high temperature resistant epoxy glue, through the experiment, this glue can effectively avoid water to flow out from the rock body) fixed connection rock body opposite face's edge, put into the confined pressure indoor with the rock specimen, set for temperature and confined pressure according to the operating condition requirement, reset the flow of fluid injection pump to start, carry out the permeability test.
Claims (4)
1. The utility model provides a rock acid-etching crack permeability testing arrangement which characterized in that: the device comprises a confining pressure chamber (2), wherein a pair of rock samples (1) are arranged in the confining pressure chamber (2), a straight crack is arranged between the pair of rock samples (1), the pair of rock samples (1) are semi-cylindrical, and the longitudinal side edges of the pair of rock samples (1) are attached to each other; the top cracks between the pair of rock samples (1) are connected with a liquid drainage mechanism (5), and the bottom cracks between the pair of rock samples (1) are connected with a liquid supply mechanism (4);
the liquid supply mechanism (4) is provided with a metering pump (6), the metering pump (6) is connected with a bottom crack between the rock samples (1) through a water supply pipe, and an upstream metering bottle (13) and a first pressure sensor (14) are arranged on the water supply pipe;
the drainage mechanism (5) is provided with a drainage pool (15), the drainage pool (15) is connected with a top crack between the pair of rock samples (1) through a drainage pipe, and the drainage pipe is provided with a downstream metering bottle (16) and a second pressure sensor (17);
the metering pump (6), the first pressure sensor (14) and the second pressure sensor (17) are respectively connected with the controller (7) through electric signals;
the lower side wall of the confining pressure chamber (2) is provided with a base (12).
2. The rock acid-eroded fracture permeability testing device of claim 1, characterized in that: the outer side wall of the confining pressure chamber (2) is provided with a heater (3), and the confining pressure chamber (2) is filled with high-temperature-resistant silicon oil.
3. The rock acid-eroded fracture permeability testing device of claim 1, characterized in that: the outer side walls of the pair of rock samples (1) are provided with heat shrinkable sleeves (8); the clamping mechanism (9) is installed on the upper side wall of the confining pressure chamber (2), and the output end of the clamping mechanism (9) penetrates through the upper side wall of the confining pressure chamber (2) and is used for fixing the rock sample (1);
cushion blocks (10) are arranged between the output end of the clamping mechanism (9) and the pair of rock samples (1);
a base plate (11) is arranged between the lower side wall of the confining pressure chamber (2) and the pair of rock samples (1), and the base plate (11) and the cushion block (10) are both provided with communicating holes.
4. The rock acid-eroded fracture permeability testing device of claim 3, characterized in that: the edges of the opposite surfaces of the pair of rock samples (1) are fixed through sealing glue, and the fixed dimension of the pair of rock samples (1) is a cylinder with the diameter of 50 mm multiplied by 100 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123285067.9U CN216594692U (en) | 2021-12-24 | 2021-12-24 | Rock acid-etching crack permeability testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123285067.9U CN216594692U (en) | 2021-12-24 | 2021-12-24 | Rock acid-etching crack permeability testing device |
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| CN216594692U true CN216594692U (en) | 2022-05-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324107A (en) * | 2021-12-24 | 2022-04-12 | 沈阳工业大学 | Rock acid-etching crack permeability testing device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324107A (en) * | 2021-12-24 | 2022-04-12 | 沈阳工业大学 | Rock acid-etching crack permeability testing device and method |
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