CN211978636U - Testing device for full-diameter shale radial permeability - Google Patents
Testing device for full-diameter shale radial permeability Download PDFInfo
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- CN211978636U CN211978636U CN202020550495.6U CN202020550495U CN211978636U CN 211978636 U CN211978636 U CN 211978636U CN 202020550495 U CN202020550495 U CN 202020550495U CN 211978636 U CN211978636 U CN 211978636U
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 230000035699 permeability Effects 0.000 title claims abstract description 28
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- 239000007924 injection Substances 0.000 claims abstract description 105
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
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Abstract
The utility model provides a testing arrangement of full diameter shale radial permeability. The test device comprises a core holder, an axial pressure pump, a confining pressure pump and a fluid seepage monitoring system, wherein the core holder comprises a first plug assembly, a pressure bearing cylinder, a second plug assembly, a rubber sleeve, a plug, at least one confluence assembly and an output plug which are coaxially and sequentially connected, an airtight space for placing a core to be tested is enclosed by the injection plug, the output plug and the rubber sleeve, and the axial pressure pump can apply axial pressure to the core to be tested; the confining pressure booster pump can apply confining pressure to the rock core to be measured; the fluid seepage monitoring system includes an infusion pump, a fluid holding tank, a plurality of flow meters, a plurality of pressure gauges, and a plurality of control valves. The beneficial effects of the utility model include: the device has good sealing performance and high testing efficiency, and can test the permeability of different radial directions.
Description
Technical Field
The utility model relates to a shale reservoir production increase reforms transform technical field, specifically relates to a testing arrangement of radial infiltration ability of full diameter shale.
Background
The shale gas reservoir usually contains a large number of nano-scale pores and secondary micro-scale pores and microcracks, has multi-scale seepage characteristics such as viscous flow, slippage flow and Knudsen diffusion flow, and the unique seepage characteristics show strong anisotropy, and the existence of the coupling effect of a ground stress field and a temperature field causes that the conventional seepage theory cannot adapt to the yield increase transformation of the shale gas reservoir.
SUMMERY OF THE UTILITY MODEL
To the not enough that exist among the prior art, the utility model aims to solve one or more problems that exist among the above-mentioned prior art. For example, one of the objectives of the present invention is to provide a device for testing the radial permeability of full-diameter shale.
In order to realize the purpose, the utility model provides a full diameter shale radial permeability's testing arrangement. The testing device can comprise a core holder, an axial pressure pump, a confining pressure pump and a fluid seepage monitoring system, wherein the core holder can comprise a first plug assembly, a pressure bearing cylinder and a second plug assembly which are coaxially and sequentially connected, a rubber sleeve arranged in the pressure bearing cylinder, an injection plug, at least one confluence assembly and a production plug which are arranged in the rubber sleeve, and the injection plug, the production plug and the rubber sleeve enclose a closed space for placing a core to be tested; the first plug assembly is connected with the first opening in a sealing mode and is configured to transmit axial pressure to the injection plug, and the second plug assembly is connected with the second opening in a sealing mode and is configured to fix the production plug; the rubber sleeve is respectively connected with the first plug assembly and the second plug assembly in a sealing manner, and forms a closed confining pressure cavity together with the first plug assembly, the pressure bearing barrel and the second plug assembly; the injection plug is provided with an injection channel for injecting fluid into the core to be tested, and the output plug is provided with an output channel for discharging the fluid; the at least one confluence assembly is arranged along the length direction of the outer wall of the rock core to be detected and wraps the rock core to be detected so as to collect the fluid to the production channel; the axial pressure pump is used for driving the first plug assembly to apply axial pressure to the injection plug so as to form axial pressure on the core to be tested; the confining pressure booster pump is communicated with the confining pressure cavity and is configured to be capable of injecting confining pressure liquid into the confining pressure cavity so as to form confining pressure on the core to be detected; the fluid seepage monitoring system comprises an injection pump, a fluid container tank, an injection fluid flowmeter, an injection control valve, an injection pressure sensor, a production control valve, a production fluid flowmeter and a production pressure sensor, wherein the fluid container tank, the injection fluid flowmeter, the injection control valve and an injection channel are sequentially connected through pipelines, fluid injected into a core to be tested is stored in the fluid container tank, the injection fluid flowmeter is used for monitoring the flow of the injected fluid, and the injection control valve is used for controlling the opening and closing of the pipelines; the injection pump can pump the fluid in the fluid container tank into the core holder; an injection pressure sensor provided on a line connecting the injection control valve with the injection passage and configured to be able to monitor a pressure of the injection fluid; the output channel, the output control valve and the output fluid flowmeter are sequentially connected through a pipeline, the output control valve is used for controlling the opening and closing of the pipeline, and the output fluid flowmeter is used for monitoring the flow of the output fluid; a production pressure sensor is disposed on the pipeline connecting the production control valve to the production fluid flow meter and is configured to monitor the pressure of the production fluid.
In an exemplary embodiment of the present invention, the first plug assembly may include a first closure cap, an adjustment plug, an adjustment sleeve, and a first adjustment sleeve, wherein,
one end of the adjusting plug is hermetically connected with the first opening end of the pressure bearing barrel, and the other end of the adjusting plug is hermetically connected with the first sealing cover;
one end of the first positioning sleeve is connected with the injection plug, and the other end of the first positioning sleeve is connected with the adjusting sleeve;
the first positioning sleeve and the adjusting sleeve are arranged in the adjusting plug and the first sealing cover and can be matched with each other to adjust and fix the axial position of the injection plug.
The utility model discloses an in an exemplary embodiment, adjusting sleeve with can form between the regulation end cap along first opening extremely first cavity and the second cavity that second opening distributes and mutual isolation, still be provided with the pump notes passageway with first cavity and external intercommunication on the regulation end cap, the pump notes passageway passes through the pipeline with the axial force (forcing) pump and is connected, promotes adjusting sleeve and first positioning sleeve after pouring into axial pressure liquid and applys axial pressure to pouring into the end cap into to the rock core that awaits measuring forms axial pressure, wherein, under the circumstances of pump notes passageway shutoff, first cavity is sealed.
In an exemplary embodiment of the present invention, the first plug assembly may include a piston disposed inside, and the driving piston applies an axial pressure to the injection plug to form an axial pressure on the core to be tested, wherein the piston has a passage for the injection line to pass through.
In an exemplary embodiment of the present invention, the second plug assembly may include a fixed plug, a second cover, and a second positioning sleeve disposed inside the fixed plug, wherein,
the fixed plug is fixedly connected with the second opening;
the second sealing cover can fixedly connect the fixed plug and the second positioning sleeve with the second opening end of the pressure bearing cylinder, wherein the fixed plug is connected with the pressure bearing cylinder in a sealing manner.
In an exemplary embodiment of the present invention, the output channel, the output control valve, the output fluid flow meter and the output pressure sensor respectively may include at least one sub-output channel, a sub-output control valve, a sub-output fluid flow meter and a sub-output pressure sensor, and the sub-output channel, the sub-output control valve, the sub-output fluid flow meter and the sub-output pressure sensor are in one-to-one correspondence, and with the at least one confluence module in one-to-one correspondence.
Compared with the prior art, the beneficial effects of the utility model can include: the device has good sealing performance and high testing efficiency, and can test the permeability of different radial directions.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic structural diagram of a full-diameter shale radial permeability testing apparatus in an exemplary embodiment of the present invention;
fig. 2 shows a schematic structural view of an adjusting plug in an exemplary embodiment of the present invention;
fig. 3 shows a schematic structural view of a fixed plug in an exemplary embodiment of the invention;
fig. 4 shows a schematic view of an injection plug in an exemplary embodiment of the invention;
fig. 5 shows a schematic diagram of a production plug in an exemplary embodiment of the invention;
fig. 6 shows a schematic structural view of a bus bar assembly in an exemplary embodiment of the invention;
fig. 7 illustrates a mounting schematic of a bus bar assembly in an exemplary embodiment of the invention;
fig. 8 shows a schematic position of the fluid injection line and the core under test in an exemplary embodiment of the invention;
fig. 9 shows a schematic test diagram in an exemplary embodiment of the invention.
The main reference numbers are as follows:
1. an injection plug, 101, a first cylinder section, 102, a second cylinder section, 103, a third circular through section, 2, a second sealing cover, 3, a fixed plug, 301, a fourth cylinder section, 302, a fifth cylinder section, 303, a sixth cylinder section, 4, a pressure-bearing cylinder, 5, a rubber sleeve, 6, an output plug, 7, a fluid manifold, 8, a heat-insulating sleeve, 9, a first positioning sleeve, 10, an adjusting plug, 11, a pump injection inlet, 12, a first sealing cover, 13, an adjusting sleeve, 14, a fluid injection pipe, 15, a fluid output pipe, 16, a second positioning sleeve, 17, an injection channel, 18, an output channel, 18a, an output channel liquid inlet, 18b, an output channel liquid outlet, 19, a confluence network, 20, a core to be tested, 21, an axial pressurizing pump, 22, a confining pressure pressurizing pump, 23, a fluid container tank, 24, a pressure reducing valve, 25, injection fluid, 26, a one-way valve, 27. injection pressure sensor, 28, injection pump, 29, sub-production control valve, 31, sub-production pressure sensor, 32, sub-production fluid flow meter, 33, stopcock a, 34, stopcock B, 35, stopcock C, 36, stopcock D, 37, sub-production fluid flow meter a, 38, sub-production fluid flow meter B, 39, sub-production fluid flow meter C, 40, sub-production fluid flow meter D, 41, sub-production pressure sensor a, 42, sub-production pressure sensor B, 43, sub-production pressure sensor C, 44, sub-production pressure sensor D.
Detailed Description
Hereinafter, the testing device for the full-diameter shale radial permeability of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
The utility model provides a testing arrangement of full diameter shale radial permeability on the one hand.
In an exemplary embodiment of the present invention, as shown in fig. 1, the testing device may include a core holder, an axial pressure pump 21, a confining pressure pump 22, and a fluid seepage monitoring system.
Specifically, the core holder may include a first plug assembly, a pressure-bearing cylinder 4, a second plug assembly, a rubber sleeve 5, an injection plug 1, at least one confluence assembly and an output plug 6, which are coaxial and sequentially connected, the rubber sleeve 5 is arranged inside the pressure-bearing cylinder 4, and the injection plug 1, the at least one confluence assembly and the output plug 6 are arranged inside the rubber sleeve 5, as shown in fig. 1, the rubber sleeve 5, the injection plug 1, the output plug 6, the first plug assembly, the pressure-bearing cylinder 4 and the second plug assembly may be coaxially arranged.
In this embodiment, as shown in fig. 1, the pressure-bearing cylinder 4 may be cylindrical, and may have a first opening at one end of the left side and a second opening at one end of the right side, wherein the first opening end of the pressure-bearing cylinder 4 is connected to the first plug assembly, and the second opening end of the pressure-bearing cylinder 4 is connected to the second plug assembly. In addition, the outer wall of the pressure-bearing cylinder 4 can be wrapped with a heat insulation sleeve 8, and the temperature change of the clamp holder during the experiment can be reduced by arranging the heat insulation sleeve 8, so that the test result is more accurate.
In this embodiment, as shown in fig. 1, the rubber sleeve 5 may have an open-ended tubular structure at both ends in the axial direction, and have open-ended both ends and be connected with first end cap subassembly and second end cap subassembly sealing contact respectively, the middle part of rubber sleeve 5 may be sunken, and can also enclose into sealed confined pressure cavity with the inner wall of pressure-bearing cylinder 4, first end cap subassembly and second end cap subassembly (or the rubber sleeve 5 encloses into sealed confined pressure cavity with the inner wall of pressure-bearing cylinder 4), and pressure-bearing cylinder 4 may have a pore canal penetrating through the side wall so that the confined pressure cavity communicates with the outside, so as to inject confined pressure liquid into the confined pressure cavity.
In this embodiment, as shown in fig. 1, both the injection plug 1 and the production plug 6 may be composed of two coaxially connected cylindrical sections, and the radial dimensions of the cylindrical sections are not the same (as shown in fig. 4 and fig. 5), but the radial dimensions of the cylindrical sections with larger radial dimensions constituting the injection plug 1 and the production plug 6 are the same, and both the cylindrical sections with larger radial dimensions may be attached to the inner wall of the rubber sleeve 5 to be matched with each other, and the two cylindrical sections with larger radial dimensions are oppositely disposed, the core 20 to be tested may be disposed in the space surrounded by the rubber sleeve 5, the injection plug 1, and the production plug 6, the core 20 to be tested may be a cylindrical core, the core 20 to be tested may be coaxially disposed with the holder, and one axial end of the core 20 to be tested may be in contact with the injection plug 1 (in contact with the end with larger radial dimension of the injection plug 1), and the other axial end may be in contact with the production plug 6 (, the radial dimension of the core to be measured is 0.8-0.9 times of the inner diameter of the rubber sleeve. As shown in fig. 4, the injection plug 1 is provided with a through injection channel 17 for introducing a test fluid into the core to be tested; as shown in fig. 5, at least one sub-output channel has been seted up on output plug 6, output channel inlet 18a can be located output plug 6 and the terminal surface of the 5 complex one ends of gum cover, output channel outlet 18b can set up on the terminal surface that output plug 6 deviates from the end of injecting into plug one end, sub-output channel can be L shape passageway, the number of sub-output channel can be 4 ~ 8 (the number of sub-output channel can be the even number), for example 4 or 6 or 8, confirm according to length and the diameter of the rock core that awaits measuring and the fluid volume of injecting into, every sub-output channel can all correspond a subassembly that converges respectively.
Specifically, first end cap subassembly can stretch into in the pressure-bearing section of thick bamboo 4 from first open end to can have the fixed sealing connection of first open-ended one end with the pressure-bearing section of thick bamboo 4, and can also exert axial thrust to injecting into end cap 1, adjust the axial position of injecting into end cap 1 in gum cover 5, thereby can make this device adapt to the rock core that awaits measuring of different length. The first plug assembly may include a first closure cap 12, an adjustment plug 10, an adjustment sleeve 13, and a first adjustment sleeve 9. As shown in fig. 1, the adjusting plug 10 may be a cylindrical or tube-like structure, and one end of the adjusting plug 10 and the first open end of the pressure-bearing cylinder 4 may be in threaded connection, and may be sealed by a sealing member (e.g., by an O-ring), and the other end is in sealed connection with the first cover 12; the first sealing cover 12 can be a disc-like shape, an opening is arranged in the middle of the disc, the first sealing cover 12 can be fixedly connected with the adjusting plug 10 through a bolt, and is sealed through a sealing element (such as an O-shaped sealing ring), and in addition, an open pore structure which is convenient for the adjusting plug and the pressure-bearing cylinder to be detached and installed can be arranged on the adjusting plug 10; the adjusting sleeve 13 may include a cylindrical barrel and a boss-like structure located on an outer wall of the barrel, the adjusting sleeve 13 may be matched with the first positioning sleeve 9 to adjust and fix an axial position of the injection plug 1 in the rubber sleeve 5, specifically, the adjusting sleeve 13, the first positioning sleeve 9 and the injection plug 1 may be sequentially disposed along a direction from the first opening to the second opening, wherein a part of the barrel of the adjusting sleeve 13 may be located inside the adjusting plug 10, an end portion (i.e., a right side in fig. 1) of the part of the barrel may contact with the first positioning sleeve 9, and the rest of the barrels are located outside; part of or all of the cylinder body of the first positioning sleeve 9 can penetrate into the rubber sleeve 5 to be contacted with the injection plug 1.
In this embodiment, as shown in fig. 1, a first cavity and a second cavity which are distributed along the first opening to the second opening and are isolated from each other can be formed between the adjusting sleeve 13 and the adjusting plug 10, and the adjusting plug 10 can be further provided with a pump inlet 11 which communicates the first cavity with the outside, wherein the second cavity is closed, and when the pump inlet is blocked, the first cavity is closed. Fluid is injected into the first cavity through the pump injection port 11, so that the first positioning sleeve 9 can be pushed to move in the direction from the first opening to the second opening, and the axial position of the injection plug 1 in the rubber sleeve 5 can be adjusted and fixed. The adjustment sleeve 13 and the first positioning sleeve 9 may be of an integral construction.
In this embodiment, as shown in fig. 2, the adjusting plug 10 may include a first cylindrical section 101, a second cylindrical section 102, and a third cylindrical section 103, which are sequentially connected in the axial direction, and an inner diameter of the second cylindrical section 102 is greater than an inner diameter of the third cylindrical section 103, wherein an outer wall of the second cylindrical section 102 is fixedly and hermetically connected with an inner wall of the pressure-bearing cylinder 4, and the third cylindrical section 103 is hermetically connected with the rubber sleeve 5. Furthermore, the first cylinder section 101 may be provided with a radially penetrating injection channel 11.
In addition, the first plug assembly may further include a piston disposed inside the adjusting sleeve 13, and the piston is driven to apply an axial pressure to the injection plug to form an axial pressure on the core to be tested, wherein the piston may have a passage for the injection line to pass through.
Specifically, the second choke plug assembly can stretch into the barrel of the pressure-bearing barrel 4 from the second opening, and can be fixedly and hermetically connected with one end of the pressure-bearing barrel 4 with the second opening, and the output choke plug 6 is fixed. Specifically, a second plug assembly can be partially disposed in the second opening of the holder pressure-bearing cylinder 4 and form a fixed sealing connection with the inner wall of the second opening, and the second plug assembly can be connected or in contact with the production plug 6, so as to fix the position of the production plug 6 in the rubber sleeve 5, and to apply axial stress to shale cores of different lengths in cooperation with the injection plug 1. For example, the second plug assembly may include a fixed plug 3, a second cover 2, and a second positioning sleeve 16 disposed inside the fixed plug 3, wherein the fixed plug 3 is of a cylindrical or tube-like structure and is fixedly connected to one end of the corresponding pressure-bearing cylinder 4 having a second opening; the second sealing cover 2 can fixedly connect the fixed plug 3 and the second positioning sleeve 16 with one end of the pressure-bearing cylinder 4 with the second opening. As shown in fig. 3, the fixing plug 3 may include a fourth cylinder segment 301, a fifth cylinder segment 302 and a sixth cylinder segment 303, which are sequentially connected in the axial direction, wherein the sixth cylinder segment 303 is fixedly connected to the end of the pressure-bearing cylinder 4 having the second opening (i.e., the upper end of the pressure-bearing cylinder in fig. 1), a sealing member is disposed between the fifth cylinder segment 302 and the inner wall of the second opening of the pressure-bearing cylinder 4, and the fourth cylinder segment 303 is in sealing contact with the rubber sleeve 5. Specifically, the second sealing cover 2 is bottle-like, a fourth opening is formed in the second sealing cover 2, threads are formed in the outer wall of the end, provided with the second opening, of the pressure-bearing cylinder 4, and the second sealing cover 2 is in threaded connection with the end, provided with the second opening, of the pressure-bearing cylinder 4. Of course, the fixed plug 3 and the second positioning sleeve 16 can also be integrated here. In addition, the second sealing cover 2 can be provided with an opening to facilitate the dismounting and mounting of the second sealing cover 2 and the pressure-bearing cylinder 4. However, the utility model discloses be not limited to this, the second end cap subassembly also can be other structures as long as can have the fixed sealing connection of second open-ended one end and can fix the position of output end cap in the packing element with a pressure-bearing section of thick bamboo.
Thus, as shown in fig. 1, the left end of the rubber sleeve 5 may be in sealing contact with the third cylindrical section 103 of the adjusting plug 10 of the first plug assembly, and the right end thereof may be in sealing contact with the fourth cylindrical section 304 of the fixed plug 3 of the second plug assembly.
Specifically, as shown in fig. 1, the confluence assembly is located between the injection plug 1 and the production plug 6, and can be wrapped on the core 20 to be tested along the length direction of the outer wall of the core 20 to be tested to collect the fluid. As shown in fig. 6, the manifold assembly may include a fluid manifold network 19 and a fluid manifold plate 7, the fluid manifold network 19 being disposed on the fluid manifold plate 7, the fluid manifold network 19 being capable of collecting fluid radially percolating from the shale core 20 onto the fluid manifold plate 7, the fluid manifold plate 7 collecting the fluid into the production passage 18. Specifically, the confluence assembly can wrap the radial circumferential surface of the shale core 20 to be tested, and can collect the liquid seeped from the seam in the shale core and then convey the liquid to the outside through the production channel 18 on the production plug 6. As shown in fig. 5, the confluence module includes a fluid confluence net 19 and a fluid confluence plate 7, the confluence module is integrally an arc-shaped structure attached to the circumferential surface of the shale core 20, the fluid confluence net 19 is disposed on the fluid confluence plate 7 at the surface attached to the shale core 20, and the droplets radially seeping from the shale core 20 are converged into a fluid flow through the fluid confluence net and enter the production channel 18 through the fluid confluence plate 7. For example, the number of the fluid confluence net 19 and the fluid confluence plate 7 may be 4-8 depending on the diameter of the shale core. A schematic diagram of the shale core 20, the flow-converging assembly, and the production plug 6 may be shown in fig. 7.
Specifically, as shown in fig. 1, the axial pressurizing pump 21 may be in communication with the pump inlet 11 through a pipeline, and provides a liquid for driving the first plug assembly, so as to form an axial pressure on the core 20 to be measured; the confining pressure booster pump 22 can be connected with a pore passage of the pressure-bearing cylinder 4 through a pipeline and the side wall so as to inject confining pressure liquid into the confining pressure cavity and form confining pressure on the core to be measured.
Specifically, as shown in FIG. 1, the fluid seepage monitoring system includes an injection pump 28, a fluid holding tank 23, an injection fluid flow meter 25, an injection control valve 26, an injection pressure sensor 27, a production control valve, a production fluid flow meter, and a production pressure sensor. The fluid container tank 23, the injection fluid flow meter 25, the injection control valve 26 and the injection channel 17 are sequentially connected through pipelines, fluid injected into a core to be measured is stored in the fluid container tank 23, the injection fluid flow meter 25 is used for monitoring the flow rate of the injected fluid, the injection control valve 26 is used for controlling the opening and closing of the pipelines, the injection pump 28 can pump the fluid in the fluid container tank 23 into the core holder, and the injection pressure sensor 27 is arranged on the pipeline connecting the injection control valve 26 and the injection channel 17 and is configured to monitor the pressure of the injected fluid.
In this embodiment, a pressure reducing valve 24 may be further provided on a line connecting the fluid container tank 23 and the injection fluid flow meter 25 for reducing pressure.
In this embodiment, the fluid reservoir tank 23 may be a liquid reservoir tank storing liquid, the injection pump 28 may be a constant-speed constant-pressure pump or a fluid advection pump, the injection control valve 26 may be a check valve, and the line ultimately leading into the injection passage 17 may be a metal pipe, such as the fluid injection pipe 14 shown in fig. 1.
As shown in fig. 1, the production passage 18, the production control valve 29 and the production fluid flow meter are connected in sequence by pipelines, the production control valve 29 is used for controlling the opening and closing of the pipelines, the production fluid flow meter 32 is used for monitoring the flow rate of the produced fluid, the production pressure sensor 31 is arranged on the pipeline where the production control valve 29 and the production fluid flow meter 32 are connected and is configured to monitor the pressure of the produced fluid, and the pipeline connected from the production passage 18 can be a metal pipe, such as the fluid output pipe 15 shown in fig. 1.
In this embodiment, the production channels, production control valves, production fluid flow meters and production pressure sensors comprise at least one sub-production channel 18, sub-production control valve 29, sub-production fluid flow meter 32 and sub-production pressure sensor 31, respectively, and are in one-to-one correspondence with the at least one confluence module, so that the flow meters and pressure meters connected to each production channel can test the permeability of a single radial direction, respectively.
In this embodiment, the sub-yield control valve may comprise a stopcock valve.
In this embodiment, the working principle of the apparatus may include: drying a cylindrical rock core to be tested, drilling a coaxial pore channel on the rock core to be tested, and then putting the rock core to be tested into a testing device, wherein one end with the pore channel faces an injection plug, and a fluid for testing is introduced into the pore channel; axial pressurization of the core to be measured is realized by pressurizing the piston; opening a confining pressure pump, injecting confining pressure liquid into the confining pressure cavity to pressurize the rubber sleeve, and realizing confining pressure pressurization on the core to be tested; starting an injection pump, pumping the fluid in the fluid container tank into a clamp holder, and monitoring the flow and pressure of the injected and produced fluid through an injection fluid flow meter, an injection pressure sensor, a produced fluid flow meter and a produced pressure sensor (all production channels are open); when the flow and pressure of the injected fluid and the produced fluid (the flow and pressure recorded by the sub-produced fluid flow meter and the sub-produced pressure sensor corresponding to all the production channels) are stable for 0.8-1.5 h, performing a permeability test, wherein the permeability is K,
wherein h is the depth of the pore channel, P1To inject the pressure of the fluid, P2To produce a pressure of the fluid, r1Is the radius of the bore, Q is the flow rate of the produced fluid, r2The radius of the core to be measured is shown, mu is a viscosity unit, and the unit is MPa.S; furthermore, by the device, we can also:
testing the anisotropy of permeability in different radial directions by monitoring the pressure of the injected and produced fluids of at least one production channel separately, the anisotropy of permeability being expressed in the form of a matrix;
using metal pipelines with different lengths to sequentially perform anisotropy measurement, repeated permeability test and anisotropy test of permeability at different radial sections in the pore canal, comparing the measurement results, and evaluating the heterogeneity of the shale core;
in order to correct the dependence of the pore and fracture volume on the permeability, the method can further comprise the following steps before drilling the channel: scanning the volume ratio of the internal pore and the natural fracture in the radial direction; after permeability tests in different radial directions, comparison and correction are carried out according to the volume ratio and permeability of pores and natural fractures in different radial directions, and the correlation between the pores and natural fractures is determined.
In another exemplary embodiment of the present invention, based on the above exemplary embodiment, four confluence assemblies are provided, as shown in fig. 9 (only correspondence is shown in the figure, and no specific structural relationship is shown), and a total of four confluence assemblies respectively corresponding to the four confluence assemblies may include four sub-production channels, four stopcocks (which may be respectively denoted as stopcock a33, stopcock B34, stopcock C35, and stopcock D36), four sub-production fluid flow meters (which may be respectively denoted as sub-production fluid flow meter a37, sub-production fluid flow meter B38, sub-production fluid flow meter C39, sub-production fluid flow meter D40), and four sub-production pressure sensors (which may be respectively denoted as sub-production pressure sensor a41, sub-production pressure sensor B42, sub-production pressure sensor C43, and sub-production pressure sensor D44), the four confluence assemblies are uniformly disposed on the outer wall of the core assembly to be measured, meanwhile, the pipe fitting for introducing the core testing fluid to be tested can be introduced into four different positions, namely a1, a2, A3 and a4, of the core duct to be tested, as shown in fig. 8, although the pipe fitting shown in the figure is a fluid injection pipe fitting and the radial size of the fluid injection pipe fitting is smaller than that of the duct in the middle of the core to be tested, the fluid injection pipe fitting can be actually attached to the inner wall of the duct, so that the accuracy in testing the permeability of different axial positions (for example, the four different positions, namely a1, a2, A3 and a4 in fig. 8) can be ensured.
To sum up, the utility model discloses a full diameter shale radial permeability's testing arrangement's advantage can include: the utility model discloses a testing arrangement realizes triaxial stress loading and uninstallation in the test procedure, and experimental apparatus's sealing performance is good, and efficiency of software testing is high.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The testing device for the radial permeability of the full-diameter shale is characterized by comprising a rock core holder, an axial pressurizing pump, a confining pressure pressurizing pump and a fluid seepage monitoring system, wherein,
the rock core holder comprises a first plug assembly, a pressure bearing cylinder, a second plug assembly, a rubber sleeve, an injection plug, at least one confluence assembly and an output plug, wherein the first plug assembly, the pressure bearing cylinder and the second plug assembly are coaxially and sequentially connected, the rubber sleeve is arranged in the pressure bearing cylinder, the injection plug, the at least one confluence assembly and the output plug are arranged in the rubber sleeve, the injection plug, the output plug and the rubber sleeve enclose a closed space for placing a rock core to be tested, wherein,
the pressure-bearing cylinder comprises a first opening and a second opening at two ends;
the first plug assembly is connected with the first opening in a sealing mode and is configured to transmit axial pressure to the injection plug, and the second plug assembly is connected with the second opening in a sealing mode and is configured to fix the production plug;
the rubber sleeve is respectively connected with the first plug assembly and the second plug assembly in a sealing manner, and forms a closed confining pressure cavity together with the first plug assembly, the pressure bearing barrel and the second plug assembly;
the injection plug is provided with an injection channel for injecting fluid into the core to be tested, and the output plug is provided with an output channel for discharging the fluid;
the at least one confluence assembly is arranged along the length direction of the outer wall of the rock core to be detected and wraps the rock core to be detected so as to collect the fluid to the production channel;
the axial pressure pump is used for driving the first plug assembly to apply axial pressure to the injection plug so as to form axial pressure on the core to be tested;
the confining pressure booster pump is communicated with the confining pressure cavity and is configured to be capable of injecting confining pressure liquid into the confining pressure cavity so as to form confining pressure on the core to be detected;
the fluid seepage monitoring system comprises an injection pump, a fluid container tank, an injection fluid flow meter, an injection control valve, an injection pressure sensor, a production control valve, a production fluid flow meter and a production pressure sensor, wherein,
the fluid container tank, the injection fluid flowmeter, the injection control valve and the injection channel are sequentially connected through pipelines, fluid injected into the core to be tested is stored in the fluid container tank, the injection fluid flowmeter is used for monitoring the flow of the injection fluid, and the injection control valve is used for controlling the opening and closing of the pipelines;
the injection pump can pump the fluid in the fluid container tank into the core holder;
an injection pressure sensor provided on a line connecting the injection control valve with the injection passage and configured to be able to monitor a pressure of the injection fluid;
the output channel, the output control valve and the output fluid flowmeter are sequentially connected through a pipeline, the output control valve is used for controlling the opening and closing of the pipeline, and the output fluid flowmeter is used for monitoring the flow of the output fluid;
a production pressure sensor is disposed on the pipeline connecting the production control valve to the production fluid flow meter and is configured to monitor the pressure of the production fluid.
2. The full-diameter shale radial permeability testing apparatus as claimed in claim 1, wherein the first plug assembly comprises a first cover, an adjusting plug, an adjusting sleeve and a first adjusting sleeve, wherein,
one end of the adjusting plug is hermetically connected with the first opening end of the pressure bearing barrel, and the other end of the adjusting plug is hermetically connected with the first sealing cover;
one end of the first positioning sleeve is connected with the injection plug, and the other end of the first positioning sleeve is connected with the adjusting sleeve;
the first positioning sleeve and the adjusting sleeve are arranged in the adjusting plug and the first sealing cover and can be matched with each other to adjust and fix the axial position of the injection plug.
3. The testing device for the radial permeability of the full-diameter shale as claimed in claim 2, wherein a first cavity and a second cavity which are distributed from the first opening to the second opening and are isolated from each other are formed between the adjusting sleeve and the adjusting plug, a pumping channel which communicates the first cavity with the outside is further arranged on the adjusting plug, the pumping channel is connected with an axial pressurizing pump through a pipeline, the adjusting sleeve and the first positioning sleeve are pushed to apply axial pressure to the injecting plug after the axial pressurizing liquid is injected, so as to form axial pressure on the core to be tested, and the first cavity is sealed under the condition that the pumping channel is blocked.
4. The full-diameter shale radial permeability testing device as claimed in claim 1, wherein the first plug assembly comprises a piston arranged inside, the piston is driven to apply axial pressure to the injection plug so as to form axial pressure on a core to be tested, and a passage for an injection pipeline to pass through is formed in the piston.
5. The full-diameter shale radial permeability testing apparatus as claimed in claim 1, wherein the second plug assembly comprises a fixed plug, a second cover and a second locating sleeve arranged inside the fixed plug, wherein,
the fixed plug is fixedly connected with the second opening;
the second sealing cover can fixedly connect the fixed plug and the second positioning sleeve with the second opening end of the pressure bearing cylinder, wherein the fixed plug is connected with the pressure bearing cylinder in a sealing manner.
6. The full-diameter shale radial permeability testing apparatus as claimed in claim 1, wherein the production passage, the production control valve, the production fluid flow meter and the production pressure sensor respectively comprise at least one sub-production passage, sub-production control valve, sub-production fluid flow meter and sub-production pressure sensor, and the sub-production passage, sub-production control valve, sub-production fluid flow meter and sub-production pressure sensor are in one-to-one correspondence with the at least one confluence assembly.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337411A (en) * | 2020-04-14 | 2020-06-26 | 中国石油天然气集团有限公司 | Method and device for testing radial permeability of full-diameter shale |
| CN112816389A (en) * | 2020-12-31 | 2021-05-18 | 中国石油大学(北京) | Multidirectional multilayer full-diameter fracture core seepage simulation device and application thereof |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337411A (en) * | 2020-04-14 | 2020-06-26 | 中国石油天然气集团有限公司 | Method and device for testing radial permeability of full-diameter shale |
| CN111337411B (en) * | 2020-04-14 | 2024-05-28 | 中国石油天然气集团有限公司 | Method and device for testing radial permeability of full-diameter shale |
| CN112816389A (en) * | 2020-12-31 | 2021-05-18 | 中国石油大学(北京) | Multidirectional multilayer full-diameter fracture core seepage simulation device and application thereof |
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