CN116399784A - Device and method for simulating geothermal exploitation seepage test of fractured thermal reservoir - Google Patents
Device and method for simulating geothermal exploitation seepage test of fractured thermal reservoir Download PDFInfo
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- CN116399784A CN116399784A CN202310664389.9A CN202310664389A CN116399784A CN 116399784 A CN116399784 A CN 116399784A CN 202310664389 A CN202310664389 A CN 202310664389A CN 116399784 A CN116399784 A CN 116399784A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000011435 rock Substances 0.000 claims abstract description 84
- 238000009826 distribution Methods 0.000 claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 239000011148 porous material Substances 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims description 25
- 239000000498 cooling water Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 13
- 238000010998 test method Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 5
- 238000009417 prefabrication Methods 0.000 claims description 4
- 238000005325 percolation Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000012857 radioactive material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a device and a method for simulating a seepage test of geothermal exploitation of a crack type thermal reservoir, and belongs to the technical field of geothermal well simulated extraction; the problem that the existing device cannot measure multi-crack seepage at high temperature and high pressure is solved; according to the invention, rock samples with a plurality of combined cracks prefabricated in the radial direction are fixed through a hole distribution clamp, are placed in a pressure kettle, a heating and axial pressure applying device and a pore pressure applying device are configured for the pressure kettle, pore fluid flows out through a middle through hole of the rock samples, a radial seepage surface and prefabricated holes of the hole distribution clamp, and the flow velocity of the flowing-out pore fluid is measured to obtain the radial seepage characteristic of the rock under high temperature and high pressure; compared with the existing pressure kettle, the seepage device can complete seepage tests of prefabricated multi-combination fractured rock mass under various working conditions through simple structural design, and has the advantages of low cost and high utilization rate.
Description
Technical Field
The invention belongs to the technical field of geothermal well simulated extraction, and particularly relates to a device and a method for simulating a crack type thermal reservoir geothermal exploitation seepage test.
Background
Geothermal heat refers to renewable thermal energy stored inside the earth, typically generated by molten magma, radioactive material decay, or geologic structure movement. Based on the renewable nature of geothermal energy and the cleanliness of energy, the renewable nature of geothermal energy can be adopted at any time, and the development and the utilization of geothermal energy are gaining attention in more and more countries. If the thermal reservoir is a fracture type thermal reservoir with a large depth, the fracture zone or the fracture zone is a geothermal exploitation target layer, and the test of the seepage capability of the rock mass in the region is completed by means of a prefabricated fracture. The existing seepage test autoclave has single function, is usually pressed from an axial pressure head and subjected to seepage, fluid flows out from the bottom of a rock sample for seepage test, and can only realize seepage test operation under specific conditions, and the existing seepage test device can not be used for measuring seepage coefficients of the rock sample with a plurality of radial cracks.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a device and a method for simulating a crack type thermal reservoir geothermal exploitation seepage test.
In order to achieve the above purpose, the present invention is realized by the following technical scheme.
The device for simulating the seepage test of geothermal exploitation of the fractured thermal reservoir comprises a pressure kettle, wherein the pressure kettle comprises a kettle body and a kettle cover; the axial pressure head penetrates through the kettle cover to the kettle body and is used for applying axial pressure to a rock sample in the kettle body; a seepage pore canal is arranged in the axial pressure head; the kettle body is provided with a seepage interface;the device is characterized in that a hole distribution clamp is arranged in the kettle body, and the rock sample is arranged in the hole distribution clamp; multiple rows of seepage holes are distributed on the side wall of the hole distribution clamp along the axial direction, and each row of seepage holes are located on the same horizontal plane; the intervals of the multiple rows of seepage holes are consistent with the intervals of radial cracks of the rock samples; the bottom of the kettle body is provided with a clamping groove for fixedly placing a rock sample, the hole distribution clamp is fixedly connected with the clamping groove, and the inner diameter R of the clamping groove 1 With the outer diameter r of the hole distribution clamp 1 And the rock samples are equal, so that the rock samples are prevented from being radially sheared in the axial pressure loading process, the rock samples are radially expanded under the action of the axial pressure, and the confining pressure loading state is simulated under the constraint action of the hole distribution clamp.
Preferably, the kettle body is provided with a bottom seepage interface and a side seepage interface; the bottom of the clamping groove is communicated with the bottom seepage interface; the seepage holes are communicated with the lateral seepage interfaces.
Preferably, the kettle cover is connected with a cooling circulation system for cooling and protecting the axial pressure head when simulating an actual geothermal environment.
More preferably, the cooling circulation system comprises annular cooling fins arranged in the kettle cover, and a cooling water inlet pipeline and a cooling water outlet pipeline which are connected to the kettle cover.
Preferably, the holes between each row of seepage holes are uniformly distributed in a ring shape, and the number of the seepage holes in each row is more than or equal to 6.
Preferably, the end face of the kettle body is provided with a flange and an annular clamping groove, the kettle cover is embedded into the annular clamping groove and is fixedly connected with the kettle body through the flange and bolts, and a sealing sheet is embedded into the annular clamping groove for sealing.
Preferably, the kettle body is provided with a sensor interface.
A seepage test method based on a device for simulating a crack type thermal reservoir geothermal exploitation seepage test comprises the following steps:
1) Taking a complete rock sample, and punching a through hole in the middle of the rock sample along the axial direction for introducing seepage fluid; then prefabricating a plurality of cracks along the radial direction of the rock sample, and placing the rock sample with the prefabricated cracks into a hole distribution clamp;
2) Introducing seepage fluid from an axial pressure head, sequentially passing the seepage fluid through the axial pressure head, an axial through hole of a rock sample, a radial crack and a seepage hole of a hole distribution clamp, flowing out from a seepage interface, and measuring the flow and the seepage coefficient of the seepage fluid by a detection device;
when the permeability coefficient of each crack or each group of cracks in the rock sample is required to be measured, the crack prefabrication method for the rock sample comprises the following steps: prefabricating one or a group of cracks radially upwards in sequence from the bottom of a rock sample, installing a seepage test device to perform seepage test, and recording flow
Calculating permeability coefficient->
The method comprises the steps of carrying out a first treatment on the surface of the Taking out a rock sample, prefabricating the next crack or a group of cracks, installing a seepage test device again to carry out a seepage test, and recording total flow of two or two groups +.>
And calculating the permeability coefficient->
At this point the second or second set of slits actually pass the flow +.>
Calculating the permeability coefficient of the second or second group of cracks +.>
The method comprises the steps of carrying out a first treatment on the surface of the Three or more than three groups of cracks are prefabricated in the same way, and the test is finished sequentially according to the steps>
Strip or->
The actual flow rate of the group fissures +.>
Calculating permeability coefficient->
；
When the permeability coefficient of all radial cracks of the rock sample needs to be measured, the rock sample can be prefabricated at one time
The strip fissure or natural fissure rock mass is selected for seepage test, and the total flow is recorded>
Calculating permeability coefficient->
。
Preferably, the kettle body is provided with a bottom seepage interface and a side seepage interface; the bottom of the clamping groove is communicated with the bottom seepage interface; the seepage hole is communicated with the lateral seepage interface; the side seepage interface is used for radial fracture seepage test, the bottom seepage interface is used for conventional rock mass seepage test and vertical through fracture seepage test;
when a radial fracture seepage test is carried out, the bottom seepage interface is closed, so that seepage fluid flows out from the side seepage interface for measurement; when a conventional rock mass seepage test and a vertical through fracture seepage test are carried out, a rubber sleeve is placed between the hole distribution clamp and the rock sample to seal seepage holes, a lateral seepage interface is closed, and a bottom seepage interface is opened to enable seepage fluid to flow out of the bottom seepage interface.
Preferably, the gum cover wall is thick
Is 2-3 mm and has an inner diameter r with the hole distribution clamp 2 Radius r of rock sample 0 Satisfy the following requirements
。
Compared with the prior art, the invention has the following beneficial effects:
the device can perform conventional seepage test, radial fracture and seepage test of a vertical through fracture sample on a multi-fracture rock sample, simulate geothermal exploitation and pressurized recharging stages of a fracture type thermal reservoir, realize the measurement of the permeability of 3 or more prefabricated multi-combination fractures, and also perform the measurement of the permeability of a single fracture.
Drawings
FIG. 1 is a cross-sectional view of an apparatus for simulating a fracture thermal reservoir geothermal mining percolation test according to the present invention.
Fig. 2 is a top view of the hole-laying jig according to the present invention.
Fig. 3 is a view in the A-A direction of fig. 2.
Fig. 4 is a front view of the hole-laying jig according to the present invention.
Fig. 5 is a schematic diagram of the radial fissure prefabrication process of the rock sample in examples 2 and 3.
FIG. 6 is a simulation of the process of a fractured thermal reservoir geothermal recovery and pressurized recharge system.
FIG. 7 is a plan view of two, three, four, five vertical end face through slots in example 4.
The device comprises a 2-hole distribution clamp, a 3-rock sample, a 4-kettle cover, a 5-kettle body, a 6-axial pressure head, an 8-first seepage channel, a 9-second seepage channel, a 10-industrial personal computer, an 11-oil tank, a 12-water tank, a 13-first high-precision flow pump, a 14-second high-precision flow pump, a 101-flange, a 102-annular clamping groove, a 103-bolt, a 104-sealing piece, a 201-seepage hole, a 501-clamping groove, a 502-groove, a 503-bottom seepage interface, a 504-annular groove, a 505-side seepage interface, a 506-sensor interface, a 507-gasket, a 601-sealing ring, a 602-seepage pore, a 701-annular cooling fin, a 702-cooling water inlet pipeline and a 703-cooling water outlet pipeline.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
Referring to fig. 1-6, the embodiment provides a device for simulating a geothermal exploitation seepage test of a fracture type thermal reservoir, which comprises a pressure kettle, wherein the pressure kettle comprises a kettle body 5 and a kettle cover 4; the upper end face of the kettle body 5 is provided with a flange 101 and an annular clamping groove 102, the lower end face of the kettle cover 4 is embedded into the annular clamping groove 102 and fixedly connected with the kettle body 5 through the flange 101 and bolts 103, and a sealing sheet 104 is embedded into the annular clamping groove 102 for sealing. The axial pressure head 6 penetrates through the kettle cover 4 to the kettle body 5 and is used for applying axial pressure to the rock sample 3 in the kettle body 5; the contact surface of the axial pressure head 6 and the kettle cover 4 is provided with a sealing ring 601 for sealing the gap between the kettle cover 4 and the axial pressure head 6. The inner center of the axial pressure head 6 is axially provided with a seepage pore canal 602; the seepage channel 602 penetrates through the upper end face and the lower end face of the axial pressure head 6 and is used for introducing seepage fluid. The kettle cover 4 is connected with a cooling circulation system for cooling and protecting the axial pressure head 6 when simulating an actual geothermal environment. The cooling circulation system comprises annular cooling fins 701 arranged in the kettle cover 4, and a cooling water inlet pipeline 702 and a cooling water outlet pipeline 703 which are connected to the kettle cover 4, wherein the annular cooling fins 701 can cooperate with cooling water to enhance heat dissipation capacity.
A hole distribution clamp 2 is arranged in the kettle body 5, and the rock sample 3 is arranged in the hole distribution clamp 2; a plurality of rows of seepage holes 201 are axially distributed on the side wall of the hole distribution clamp 2, and each row of seepage holes 201 are positioned on the same horizontal plane; the intervals of the multiple rows of seepage holes 201 are consistent with the intervals of radial cracks of the rock sample 3; the holes among the seepage holes 201 in each row are uniformly distributed in a ring shape, and the number of the seepage holes 201 in each row is more than or equal to 6. Each row of seepage holes 201 forms a seepage channel with radial fissures on the rock sample 3 at the same level.
The center of the bottom of the kettle body 5 is provided with a clamping groove 501 for fixedly placing a rock sample 3, the hole distribution clamp 2 is fixedly connected with the clamping groove 501, and the inner diameter of the clamping groove 501
Outer diameter of the hole-distributing clamp 2>
Equality, ensure shaftIn the loading process, the rock sample 3 cannot be radially sheared, the rock sample 3 radially expands under the action of axial pressure, and the confining pressure loading state is simulated under the constraint action of the hole distribution clamp 2. A groove 502 is also arranged at the bottom center of the clamping groove 501, and a waterproof gasket 507 or a waterproof metal net is filled in the groove 502 according to different test requirements. The kettle body 5 is provided with a bottom seepage interface 503 and a side seepage interface 505; the bottom of the groove 502 is communicated with a bottom seepage interface 503; the seepage hole 201 is communicated with the side seepage interface 505 through an annular groove 504 arranged at the bottom edge of the kettle body 5. The side wall of the kettle body 5 is also provided with a sensor interface 506 for connecting a temperature sensor.
Referring to fig. 6, the oil tank 11 and the pump are controlled by the industrial personal computer 10 to apply axial pressure to the axial pressure head 6, meanwhile, the seepage pore canal 602 is connected with the first seepage channel 8, seepage fluid is pumped into the device, the bottom seepage interface 503 or the side seepage interface 505 is connected with the second seepage channel 9, and seepage fluid passing through the crack of the rock sample 3 is led out of the device, and the flow and seepage rate are measured by the industrial personal computer 10.
Example 2
The embodiment is a seepage test method based on the device for simulating the geothermal exploitation seepage test of the fractured thermal reservoir proposed in the embodiment 1: the method is specifically used for simulating the pressurized recharging of the geothermal well, namely radial fracture seepage test.
Taking the standard rock sample 3 as an example, 4 radial cracks are prefabricated, referring to fig. 5, firstly, 50×100mm standard rock sample 3 needs to be polished, a round hole of 3mm is drilled along the central direction of the standard rock sample 3, and the cracks are prefabricated along the central direction of the hole distribution clamp 2 or the cracks with the height H=5L (mm) from the bottom are prefabricated along the radial direction (L is an integer of 0 < L.ltoreq.15).
Wherein the radial prefabricated through crack can be prepared in various forms, namely, in a standard rock sample 3, as shown in figure 5, a radial prefabricated through crack is prefabricated first, the installation of a simulation system is completed to carry out a seepage test, and the flow is measured
Calculating permeability coefficient->
. Then taking out the rock sample 3, prefabricating a second crack, assembling the pressure kettle again, and performing a seepage test to measure the total flow
At this time, calculating the second slit passing flow +.>
Calculating the permeability coefficient of the second crack +.>
. The actual passing flow of the third and fourth cracks is calculated in turn by the same method>
Calculating permeability coefficient of each crack +.>
In fig. 5, 1, 2, 3, 4 radial seepage cracks are respectively preformed in the rock sample 3.
If the permeability coefficient of the sample is measured by only one seepage test, four radial cracks can be directly prefabricated in a slicing mode in the preparation process of the rock sample 3, or samples with the same height and the same crack position can be prefabricated in a mode of punching up Kong Shiyang in the middle of five radial cracks in a stacking mode, and a simulation system is installed to finish the measurement of the permeability coefficient of the sample.
The specific test operation is as follows: placing the kettle body 5 of the pressure kettle on a triaxial test platform, placing a mica plate between the kettle body 5 and the triaxial test platform for heat insulation, placing a circular copper gasket 507 at the position of the groove 502 of the kettle body 5 for sealing the groove 502, ensuring that the rock sample 3 is leveled with the hole distribution clamp 2, and closing the bottom seepage interface 503. Simultaneously, the rock sample 3 and the hole-laying clamp 2 are clamped at the clamping groove 501, and the top of the thermocouple at the sensor interface 506 is kept touching the hole-laying clamp 2.
The kettle cover 4 is covered, the axial pressure head 6 is aligned with the axial pressure head of the triaxial test machine, at the moment, seepage is carried out on a channel between the seepage pore canal 602 of the inlet and the side seepage interface 505 of the outlet, a cooling circulation system is connected into cooling water circulation through a cooling water inlet pipeline 702 and a cooling water outlet pipeline 703, and tools such as a heating block and a water tank are placed, so that seepage test can be carried out.
At this time, the pressurized recharging process of the geothermal well is simulated, and the pressurized recharging seepage fluid flows out through the axial pressure head 6, the axial through hole of the rock sample 3, the radial crack, the seepage hole 201 of the hole distribution clamp 2, the annular groove 504 and the side seepage interface 505 in sequence, passes through the second seepage channel 9 and is collected by the water tank 12.
Example 3
The embodiment is a seepage test method based on the device for simulating the geothermal exploitation seepage test of the fractured thermal reservoir proposed in the embodiment 1: specifically simulating geothermal well exploitation, namely radial fracture seepage test. Taking four-fracture simulated geothermal well extraction capacity test as an example, rock sample 3 is prepared and installed in the manner shown in example 2, and permeability coefficient K of the rock sample 3 is measured at one time 0 。
Placing the kettle body 5 on a triaxial test platform, placing a mica plate between the kettle body 5 and the triaxial test platform for heat insulation, placing a circular copper gasket 507 at the position of the groove 502 of the kettle body 5 for sealing the groove 502, ensuring that the rock sample 3 is leveled with the hole-distributing clamp 2, and closing the bottom seepage interface 503. Simultaneously, the rock sample 3 and the hole-laying clamp 2 are clamped at the clamping groove 501, and the top of the thermocouple at the sensor interface 506 is kept touching the hole-laying clamp 2.
The kettle cover 4 is covered, the axial pressure head 6 is aligned with the axial pressure head of the triaxial test machine, at the moment, seepage is carried out on a channel between the seepage pore canal 602 of the inlet and the side seepage interface 505 of the outlet, a cooling circulation system is connected into cooling water circulation through a cooling water inlet pipeline 702 and a cooling water outlet pipeline 703, and tools such as a heating block and a water tank are placed, so that seepage test can be carried out.
At this time, simulating the geothermal well exploitation process, the water in the second high-precision flow pump 14 flows through the side seepage interface 505 and returns to the annular groove 504, is collected into the axial middle hole through the radial prefabricated crack of the hole distribution clamp 2 and the rock sample 3, flows out of the pressure kettle from the seepage hole 602, passes through the first seepage channel 8 and is collected by the water tank 12.
Simulated geothermal well production processThe sample flow in the test tube is recorded, and the osmotic coefficient is calculated to obtain the osmotic coefficient of the simulation system
Collecting flow->
And evaluating the exploitation economic benefit.
Example 4
The embodiment is a seepage test method based on the device for simulating the geothermal exploitation seepage test of the fractured thermal reservoir proposed in the embodiment 1: the vertical end surface through crack seepage test is specifically carried out, and only the end surface of the rock mass prefabrication 3 is required to be provided with an axial through vertical crack and is placed in the hole distribution clamp 2, and the pressure kettle is assembled.
The vertical end face prefabricated through cracks can be manufactured in a plurality of prefabricated modes, namely, a plurality of vertical cracks are prefabricated in one standard rock sample 3, and the two, three, four and five vertical through cracks are respectively manufactured in the method shown in figure 7, namely, inscribed polygons of the end face of the sample are respectively manufactured, and the side lengths and the side numbers of the polygons respectively represent the widths and the numbers of the vertical cracks.
Placing the kettle body 5 of the pressure kettle on a triaxial test platform, placing a plurality of layers of circular metal filter screen gaskets at the positions of grooves 502 of the kettle body 5 to ensure that the sample is leveled with the hole-distributing clamp 2, opening a seepage channel of the bottom seepage interface 503, and closing the side seepage interface 505. Simultaneously, the rock mass sample 3 and the hole-distributing clamp 2 are clamped at the clamping groove 501, and the top of the thermocouple at the sensor interface 506 is kept to touch the hole-distributing clamp 2. It should be noted that the holes of the hole distribution clamp 2 may be used as a crack seepage channel, so that a rubber sleeve needs to be placed between the rock mass sample 3 and the hole distribution clamp 2 to play a role in fixing and sealing the channel. Wall thickness of rubber sleeve
Is 2-3 mm and is +.1 with the inner diameter of the hole distribution clamp 2>
Radius of rock sample 3->
Satisfy->
。
The kettle cover 4 of the pressure kettle is covered, and the axial pressure head 6 is placed to be aligned with the axial pressure head of the triaxial test machine, so that seepage is carried out on a passage between the seepage pore canal 602 of the inlet and the seepage interface 503 at the bottom of the outlet. The cooling circulation system is connected into cooling water circulation through a cooling water inlet pipeline 702 and a cooling water outlet pipeline 703, and tools such as a heating block, a water tank and the like are placed, so that a seepage test can be performed.
The pressurized recharge seepage fluid in the first high-precision flow pump 13 flows out through the axial pressure head 6, the vertical through slit and groove 502 of the rock sample 3, the metal filter screen gasket and the bottom seepage interface 503 in sequence, passes through the second seepage channel 9 and is collected by the water tank 12.
The procedure for calculating the permeability coefficient of each of the vertical through cracks was the same as in examples 2 and 3. Each crack can be prefabricated in sequence, the passing flow is recorded, and the permeability coefficient of each crack is calculated
The method comprises the steps of carrying out a first treatment on the surface of the The permeability coefficient of the multi-slit sample can be measured at one time>
。
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (10)
1. The device for simulating the seepage test of geothermal exploitation of the fractured thermal reservoir comprises a pressure kettle, wherein the pressure kettle comprises a kettle body (5) and a kettle cover (4); the axial pressure head (6) penetrates through the kettle cover (4)Penetrating into the kettle body (5) for applying axial pressure to the rock sample (3) in the kettle body (5); a seepage pore canal (602) is arranged in the axial pressure head (6); the kettle body (5) is provided with a seepage interface; the device is characterized in that a hole distribution clamp (2) is arranged in the kettle body (5), and the rock sample (3) is arranged in the hole distribution clamp (2); a plurality of rows of seepage holes (201) are axially distributed on the side wall of the hole distribution clamp (2), and each row of seepage holes (201) are positioned on the same horizontal plane; the intervals of the multiple rows of seepage holes (201) are consistent with the intervals of radial cracks of the rock samples (3); the bottom of the kettle body (5) is provided with a clamping groove (501) for fixedly placing a rock sample (3), the hole distribution clamp (2) is fixedly connected with the clamping groove (501), and the inner diameter R of the clamping groove (501) 1 With the outer diameter r of the hole distribution clamp (2) 1 And the rock samples (3) are ensured not to be radially sheared in the axial pressure loading process, the rock samples (3) are radially expanded under the action of the axial pressure, and the confining pressure loading state is simulated under the constraint action of the hole distribution clamp (2).
2. The device for simulating geothermal exploitation seepage test of a fractured thermal reservoir according to claim 1, wherein the kettle body (5) is provided with a bottom seepage interface (503) and a side seepage interface (505); the bottom of the clamping groove (501) is communicated with a bottom seepage interface (503); the seepage hole (201) is communicated with the lateral seepage interface (505).
3. The device for simulating a crack type thermal reservoir geothermal exploitation seepage test according to claim 1, wherein the kettle cover (4) is connected with a cooling circulation system for cooling and protecting the axial pressure head (6) in the simulation of an actual geothermal environment.
4. A device for simulating a split thermal reservoir geothermal exploitation percolation test according to claim 3, characterised in that the cooling circulation system comprises annular fins (701) provided inside the tank cover (4), and cooling water inlet pipes (702) and cooling water outlet pipes (703) connected to the tank cover (4).
5. The device for simulating geothermal exploitation and seepage test of a fractured thermal reservoir according to claim 1, wherein holes among each row of seepage holes (201) are uniformly distributed in a ring shape, and the number of the seepage holes (201) in each row is more than or equal to 6.
6. The device for simulating the geothermal exploitation seepage test of the fractured thermal reservoir according to claim 1, wherein the end face of the kettle body (5) is provided with a flange (101) and an annular clamping groove (102), the kettle cover (4) is embedded into the annular clamping groove (102) and fixedly connected with the kettle body (5) through the flange (101) and a bolt (103), and the annular clamping groove (102) is embedded with a sealing sheet (104) for sealing.
7. A device for simulating a split thermal reservoir geothermal exploitation percolation test according to claim 1, characterized by the fact that the tank (5) is provided with a sensor interface (506).
8. A seepage test method based on a device for simulating a geothermal exploitation seepage test of a fractured thermal reservoir according to any one of claims 1 to 7, comprising the steps of:
1) Taking a complete rock sample (3), and punching a through hole in the middle of the rock sample (3) along the axial direction for introducing seepage fluid; then prefabricating a plurality of cracks along the radial direction of the rock sample (3), and placing the rock sample (3) with the prefabricated cracks into a hole distribution clamp (2);
2) Introducing seepage fluid from an axial pressure head (6), sequentially passing through the axial pressure head (6), an axial through hole of a rock sample (3), radial cracks and seepage holes (201) of a hole distribution clamp (2), flowing out from a seepage interface, and measuring the flow and the seepage coefficient of the seepage fluid by a detection device;
when the permeability coefficient of each crack or each group of cracks in the rock sample (3) needs to be measured respectively, the cracks of the rock sample (3) are measuredThe gap prefabrication method comprises the following steps: prefabricating one or a group of cracks radially upwards in sequence from the bottom of a rock sample (3), installing a seepage test device to perform seepage test, and recording flow
Calculating permeability coefficient->
The method comprises the steps of carrying out a first treatment on the surface of the Taking out a rock sample (3), prefabricating the next crack or a group of cracks, installing a seepage test device again to perform a seepage test, and recording total flow of two or two groups +.>
And calculating the permeability coefficient->
At this point the second or second set of slits actually pass the flow +.>
-/>
Calculating the permeability coefficient of the second or second group of cracks +.>
The method comprises the steps of carrying out a first treatment on the surface of the Three or more than three groups of cracks are prefabricated in the same way, and the test is finished sequentially according to the steps>
Strip or->
The actual flow rate of the group fissures +.>
Calculating permeability coefficient->
；
When the permeability coefficient of all radial cracks of the rock sample (3) needs to be measured, the rock sample can be prefabricated at one time
The strip fissure or natural fissure rock mass is selected for seepage test, and the total flow is recorded>
Calculating permeability coefficient->
。
9. The seepage test method based on the device for simulating the geothermal exploitation seepage test of the fractured thermal reservoir according to claim 8, wherein the kettle body (5) is provided with a bottom seepage interface (503) and a side seepage interface (505); the bottom of the clamping groove (501) is communicated with a bottom seepage interface (503); the seepage hole (201) is communicated with the side seepage interface (505); the side seepage interface (505) is used for radial fracture seepage test, the bottom seepage interface (503) is used for conventional rock mass seepage test and vertical through fracture seepage test;
closing the bottom seepage interface (503) when the radial fracture seepage test is carried out, and enabling seepage fluid to flow out of the side seepage interface (505) for measurement; when a conventional rock mass seepage test and a vertical through fracture seepage test are carried out, a rubber sleeve is placed between the hole distribution clamp (2) and the rock sample (3) to seal the seepage hole (201), a side seepage interface (505) is closed, and a bottom seepage interface (503) is opened to enable seepage fluid to flow out of the bottom seepage interface (503).
10. The seepage test method based on the device for simulating the geothermal exploitation seepage test of the fractured thermal reservoir according to claim 9, wherein the wall thickness of the rubber sleeve is as follows
Is 2-3 mm and has an inner diameter r with the hole distribution clamp (2) 2 Radius r of rock sample (3) 0 Satisfy->
。
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