CN107976392B - Multifunctional network crack flow conductivity testing system and detection method and application thereof - Google Patents
Multifunctional network crack flow conductivity testing system and detection method and application thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 238000001514 detection method Methods 0.000 title abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 239000012530 fluid Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 230000007774 longterm Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 description 22
- 239000011435 rock Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000005514 two-phase flow Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Abstract
The invention discloses a multifunctional network crack flow conductivity testing system and a detection method and application thereof, wherein the multifunctional network crack flow conductivity testing system comprises a multifunctional network crack flow conductivity meter and a data acquisition system, wherein the data acquisition system is respectively connected with a flow meter, a first differential pressure meter, a first displacement meter, a second displacement meter and a second differential pressure meter; the multifunctional network crack flow guiding instrument comprises a base and a flow guiding chamber, wherein the outer wall of the flow guiding chamber is respectively provided with a flow hole and a pressure difference hole, the flow holes are connected with the flow measuring instrument through flow pipelines, and the pressure difference holes are connected with a second pressure difference instrument through second pressure difference pipelines; the first differential pressure instrument is connected with an intermediate container device through a differential pressure pipeline, the other end of the differential pressure pipeline is divided into a differential pressure branch pipe A and a differential pressure branch pipe B, the differential pressure branch pipe A is sequentially connected with a advection pump and a liquid tank, and the differential pressure branch pipe B is connected with a high-pressure gas cylinder; and a branch pipe is connected to a second pressure difference pipeline between the pressure difference hole and the second pressure difference instrument. The invention has strong functions and wide application range, and has important practical value.
Description
Technical Field
The invention relates to the field of shale gas development, in particular to a multifunctional network fracture conductivity testing system, a detection method and application thereof.
Background
With the success of commercial development of shale gas reservoirs in China, the large-scale development of unconventional oil and gas reservoirs is in continuous depth, and the hydraulic fracturing technology is a necessary technical means for modifying the oil and gas reservoirs. Because the fracture network is formed in the shale gas reservoir unlike the conventional fracturing of the oil and gas reservoir, the conventional method is still used in the current experiment for testing the fracture conductivity, and the fracture flow capability in the shale gas reservoir is difficult to accurately reflect. In shale gas reservoirs, various phenomena such as gas-liquid two-phase flow, high-speed non-Darcy gas flow and the like can occur, and distilled water is mostly adopted as a displacement medium in the conventional crack flow conductivity experiment, so that the experimental result can be greatly different from the actual situation of the shale gas reservoirs.
Disclosure of Invention
Aiming at the defect that the current conventional liquid flow measuring and guiding instrument can not simulate the flow capacity of gas or gas-liquid two-phase flow in a fracture network; the system has the capability of accurately simulating the flow of a fracture network in the shale gas reservoir, has other multiple functions, such as testing the breaking rate of propping agents, testing single fluid such as liquid or gas, simulating underground reservoirs by utilizing shale plates, testing the width of the fracture and the like, and has the advantages of expanding the application of the invention and being high in practical value.
In order to achieve the above purpose, the multifunctional network crack flow conductivity testing system provided by the invention comprises a multifunctional network crack flow conductivity meter and a data acquisition system, wherein the data acquisition system is respectively connected with a flow meter, a first differential pressure meter, a first displacement meter, a second displacement meter and a second differential pressure meter; the multifunctional network crack flow guiding instrument is respectively connected with the flow measuring instrument, the first displacement instrument, the second displacement instrument and the second pressure difference instrument through a flow pipeline, a first displacement pipeline, a second displacement pipeline and a second pressure difference pipeline, the first pressure difference instrument is connected with an intermediate container device through a pressure difference pipeline, the other end of the intermediate container device is divided into a pressure difference branch pipe and a pressure difference branch pipe, the pressure difference branch pipe is sequentially connected with a advection pump and a liquid tank, and the pressure difference branch pipe is connected with a high-pressure gas cylinder; and a branch pipe is connected to a second pressure difference pipeline between the multifunctional network crack flow guiding instrument and the second pressure difference instrument, the branch pipe is respectively connected with a vacuumizing system and a back pressure device, and the back pressure device is connected with a balance.
Further, the multifunctional network crack flow guiding instrument comprises a base, a disc-shaped flow guiding chamber chassis is arranged on the base, a flow guiding chamber center inlet is arranged in the center of the upper surface of the flow guiding chamber chassis, a circular ring-shaped filter screen is sleeved on the peripheral surface of the flow guiding chamber chassis, a hollow cylindrical flow guiding chamber plunger is arranged on the upper surface of the flow guiding chamber chassis, the flow guiding chamber plunger is inserted into the flow guiding chamber center inlet and fixed, a flow guiding chamber housing is sleeved outside the flow guiding chamber plunger, and the flow guiding chamber chassis is connected with the flow guiding chamber housing through threads.
Still further, the shell of the diversion chamber is formed by stacking a plurality of cylinders with gradually reduced diameters, the flow holes and the pressure difference holes are formed in the outer wall of the cylinder at the bottommost part of the diversion chamber, and the outer wall of the cylinder at the topmost part of the shell of the diversion chamber is symmetrically provided with groove holes for rotatably mounting the shell of the diversion chamber.
Still further, the flow hole is connected with the flow meter through a flow pipeline, and the pressure difference hole is connected with a second pressure difference meter through a second pressure difference pipeline; the flow hole (1.51) is connected with the pressure difference hole (1.52) through a collecting pipeline, and two ends of the collecting pipeline are respectively connected with the flow pipeline (3.1) and the second pressure difference pipeline (7.1); the two symmetrical groove holes are respectively connected with the first displacement instrument and the second displacement instrument through the first displacement pipeline and the second displacement pipeline.
Still further, the lateral wall central authorities of base are provided with gas-liquid inlet, pressure differential pipeline (4.1) are connected between gas-liquid inlet (1.11) and flowmeter (3) and intermediate container device (8), the symmetry is provided with the heating hole on the lateral wall of base of gas-liquid inlet both sides, the heating hole is connected with the heating rod, the base below is provided with hydraulic loading device.
Still further, pressure differential pipeline has still parallelly connected second intermediate container device, intermediate container device and second intermediate container device one side all are connected with the valve.
Still further, be provided with the feed liquor valve on the pressure differential branch pipe between pressure differential pipeline and the advection pump.
Still further, be provided with the air inlet valve on the pressure differential branch pipe between pressure differential pipeline and the high-pressure gas cylinder.
The invention also provides a method for detecting the fluid medium by the multifunctional network crack diversion capability test system, which comprises the following steps:
1) Placing a multifunctional network crack flow guiding instrument on a hydraulic loading device, closing an air inlet valve, opening a liquid inlet valve, enabling a fluid medium to enter a center inlet of a flow guiding chamber through a liquid flowmeter and a pressure difference instrument, diffusing from the center of a chassis of the flow guiding chamber to the periphery, entering a flow hole and a pressure difference hole, and testing outlet pressure;
2) Meanwhile, gradually pressurizing the multifunctional network fracture flow guiding instrument to a test standard pressure value through a hydraulic loading device, and testing the thickness change of the propping agent by utilizing a first displacement instrument and a second displacement instrument; the data are automatically transmitted to a computer through a data acquisition system, and the diversion capacity at different moments can be calculated according to the recorded data.
The invention also provides application of the multifunctional network fracture conductivity testing system in radial conductivity testing, proppant crushing capability and strength testing, fracture width and proppant embedding depth testing and long-term conductivity testing.
The invention has the beneficial effects that:
the method simulates the flow capacity of the fracture network in the shale gas reservoir, and can utilize the processed shale rock plate or the designed fracture network model to research the flow conductivity of the propping agent under different fracture network combinations. For different closure pressures, different proppant types and concentration combinations, etc.,
can carry out targeted experimental simulation research. Meanwhile, the single fluid test can be performed by using liquid or gas, and the flow conductivity of the fracture network can also be tested by adopting gas-liquid two-phase flow.
The system provided by the invention adopts the cylindrical diversion chamber, so that the flow condition of the fluid in the shale gas reservoir to the central well can be more accurately simulated, and the system is completely different from the condition that the conventional strip diversion chamber reflects the linear flow. Since linear flow occurs more in the early stages of the fracture, the duration is also shorter, so that the result tested by the conventional diversion chamber is larger and cannot reflect the later production condition of the fracture. The adoption of the cylindrical diversion chamber can reflect the radial flow condition of formation fluid in the reservoir and the fracture, and is more practical in production, therefore,
the results are more representative.
The system of the invention greatly improves the application range and avoids the condition of single function of the traditional device. Besides testing the conductivity of the fracture network, the device can also be used for testing the breaking rate of propping agents and evaluating the propping agents; simulating radial inflow of formation fluid into the wellbore;
testing the crack widths at different closing pressures; simulating the formation temperature, testing the damage of different fracturing fluid types to the flow conductivity of the propping agent, and the like.
In summary, the invention can test the conductivity of various fluid types in a fracture network, and can also be used for testing the breakage rate of propping agents and evaluating propping agents; simulating radial inflow of formation fluid into the wellbore; testing the crack widths at different closing pressures; and evaluating damage of the fracturing fluid to the flow conductivity of the propping agent. Therefore, the invention has more powerful functions,
the application range is wide, and the method has important practical value.
Drawings
FIG. 1 is a schematic diagram of a multifunctional network fracture conductivity testing system;
FIG. 2 is an exploded view of the multifunctional network fracture conductivity meter;
in the figure, a multifunctional network crack flow guiding instrument 1, a base 1.1, a gas-liquid inlet 1.11, a heating hole 1.12, a flow guiding chamber chassis 1.2, a flow guiding chamber central inlet 1.21, a circular filter screen 1.3, a flow guiding chamber plunger 1.4, a flow guiding chamber housing 1.5, a flow hole 1.51, a pressure difference hole 1.52, a groove hole 1.53, a data acquisition system 2, a flowmeter 3, a flow pipeline 3.1, a first pressure difference instrument 4, a pressure difference pipeline 4.1, a pressure difference branch pipe A4.11, a pressure difference branch pipe B4.12, a first displacement instrument 5, a first displacement pipeline 5.1, a second displacement instrument 6, a second displacement pipeline 6.1, a second pressure difference instrument 7, a second pressure difference pipeline 7.1, an intermediate container device 8, a second intermediate container device 8.1, a flat pump 9, a liquid tank 10, a high-pressure bottle 11, a branch pipe 12, a vacuum pumping system 13, a back pressure 14, a balance 15, a hydraulic loading device 16, a heating rod 17, a valve 18, a liquid inlet valve 19, a valve 20 and a collecting pipeline 21 are shown.
Detailed Description
For a better explanation of the present invention, the main content of the present invention is further elucidated below in conjunction with the specific examples, but the content of the present invention is not limited to the following examples only.
The multifunctional network crack flow conductivity testing system as shown in fig. 1-2 comprises a multifunctional network crack flow conductivity meter 1 and a data acquisition system 2, wherein the data acquisition system 2 is respectively connected with a flow meter 3, a first differential pressure meter 4, a first displacement meter 5, a second displacement meter 6 and a second differential pressure meter 7;
the multifunctional network crack flow guiding instrument 1 comprises a base 1.1, a disc-shaped flow guiding chamber chassis 1.2 is arranged on the base 1.1, a flow guiding chamber central inlet 1.21 is arranged in the center of the upper surface of the flow guiding chamber chassis 1.2, a circular ring-shaped filter screen 1.3 is sleeved on the peripheral surface of the flow guiding chamber chassis 1.2, a hollow cylindrical flow guiding chamber plunger 1.4 is arranged on the upper surface of the flow guiding chamber chassis 1.2, the flow guiding chamber plunger 1.4 is inserted and fixed on the flow guiding chamber central inlet 1.21, a flow guiding chamber housing 1.5 is sleeved outside the flow guiding chamber plunger 1.4, and the flow guiding chamber chassis 1.2 is in threaded connection with the flow guiding chamber housing 1.5.
The diversion chamber shell 1.5 is formed by stacking a plurality of cylinders with gradually reduced diameters, the flow hole 1.51 and the pressure difference hole 1.52 are arranged on the outer wall of the cylinder at the bottommost part of the diversion chamber 1.5, the outer wall of the cylinder at the topmost part of the diversion chamber shell 1.5 is symmetrically provided with groove holes 1.53,
the flow hole 1.51 is connected with the flow meter 3 through a flow pipeline 3.1, and the differential pressure hole 1.52 is connected with the second differential pressure meter 7 through a second differential pressure pipeline 7.1; the flow hole 1.51 and the pressure difference hole 1.52 are connected through a collecting pipeline 21, and two ends of the collecting pipeline 21 are respectively connected with a flow pipeline 3.1 and a second pressure difference pipeline 7.1; the two symmetrical groove holes 1.53 are respectively connected with the first displacement instrument 5 and the second displacement instrument 6 through a first displacement pipeline 5.1 and a second displacement pipeline 6.1;
a branch pipe 12 is connected on a second differential pressure pipeline 7.1 between the differential pressure hole 1.52 and the second differential pressure instrument 7,
the center of the side wall of the base 1.1 is provided with a gas-liquid inlet 1.11, the gas-liquid inlet 1.11 is connected with a pressure difference pipeline 4.1 between the flowmeter 3 and the middle container device 8, heating holes 1.12 and 1.13 are symmetrically arranged on the side wall of the base 1.1 on two sides of the gas-liquid inlet 1.11, the heating holes 1.12 are connected with a heating rod 17, and a hydraulic loading device 16 is arranged below the base 1.1.
The first differential pressure instrument 4 is connected with an intermediate container device 8 through a differential pressure pipeline 4.1, the other end of the intermediate container device 8 is divided into a differential pressure branch pipe A4.11 and a differential pressure branch pipe B4.12, the differential pressure branch pipe A4.11 is sequentially connected with a advection pump 9 and a liquid tank 10, and a liquid inlet valve 19 is arranged on the differential pressure branch pipe A4.11 between the differential pressure pipeline 4.1 and the advection pump 9;
the differential pressure branch pipe B4.12 is connected with a high-pressure gas cylinder 11; an air inlet valve 20 is arranged on a pressure difference branch pipe B4.12 between the pressure difference pipeline 4.1 and the high-pressure gas cylinder 11;
the differential pressure pipeline 4.1 is also connected in parallel with a second intermediate container device 8.1, and valves 18 are connected to one side of the intermediate container device 8 and one side of the second intermediate container device 8.1; the branch pipe 12 is respectively connected with a vacuumizing system 13 and a back pressure device 14, and the back pressure device 14 is connected with a balance 15.
The assembling method of the multifunctional network crack flow conductivity testing system comprises the following steps:
1. preparing a diversion chamber, firstly rotatably mounting a diversion chamber shell 1.5 on a diversion chamber chassis 1.2, then laying a propping agent on the diversion chamber chassis 1.2 according to a network format, placing a diversion chamber plunger 1.4 on the propping agent, ensuring the thickness of the propping agent to be uniform, and finally placing the whole diversion chamber on a hydraulic device.
2. And connecting pipelines, connecting the inlet pipeline, the outlet pipeline, the pressure difference, the flow metering pipeline and the like, putting the heating rod into the heating hole 1.13, heating according to experimental requirements, and preparing for the flow conductivity test.
The method for detecting the fluid medium (the fluid medium is liquid or gas) by using the multifunctional network fracture conductivity testing system comprises the following steps:
1) Placing the multifunctional network fracture flow guiding instrument 1 on the hydraulic loading device 16, closing the air inlet valve 20, opening the liquid inlet valve 19, enabling a fluid medium to enter the central inlet 1.21 of the flow guiding chamber through the liquid flowmeter 3 and the pressure difference instrument 4, diffusing from the center of the chassis 1.2 of the flow guiding chamber to the periphery, entering the flow hole 1.51 and the pressure difference hole 1.52, and testing the outlet pressure;
2) Meanwhile, the hydraulic loading device 16 is used for gradually pressurizing the multifunctional network fracture flow guiding instrument 1 to a test standard pressure value, and the first displacement instrument 5 and the second displacement instrument 6 are used for testing the thickness change of the propping agent; the data are automatically transmitted to a computer through the data acquisition system 2, and the diversion capacity at different moments can be calculated according to the recorded data.
Because the proppants are laid down in a certain network format, the tested conductivity is a reflected fracture network conductivity whether liquid or gas is used as a medium. This is quite different from the current flow conductivity tested with rectangular elongated channels, because the current equipment can only simulate the linear flow of a crack, but cannot simulate the crack network. The newly developed equipment can fully simulate a fracture network and can more truly reflect the actual flowing state.
The pressure relief multifunctional network crack flow conductivity testing system after the detection is finished comprises: and disassembling and cleaning the diversion chamber, and checking data such as flow, pressure difference, displacement, temperature and the like automatically collected in a computer and a fracture network diversion capacity curve.
The multifunctional network crack conductivity testing system can also be used for other detection: the other test function methods are basically the same as the above methods. The specific application is as follows:
1) Radial flow conductivity test, uniformly paving propping agent on the chassis of the flow guiding chamber according to a conventional sand paving mode, and selecting liquid or gas as a test fluid for flow conductivity test. The obtained flow conductivity can reflect the flow state of the crack closure or the later stage of the fracturing, and is complementary with the linear flow conductivity tested by the existing equipment, so that the flow conductivity is more comprehensive.
2) And (3) testing the breaking capacity and strength of the propping agent, paving the propping agent with certain mass on the diversion chamber according to the propping agent evaluation standard, placing the diversion chamber on a hydraulic device, and pressurizing according to a certain loading speed. And after the pressure is increased to the standard value, stopping pressure relief, and determining the breaking rate and the compressive strength of the propping agent.
3) Testing the width of the crack and the embedding depth of the propping agent, paving the propping agent in a diversion chamber according to a certain sand paving concentration, gradually pressurizing to a certain closing pressure value, and testing the corresponding width of the crack by using a displacement meter; and (3) releasing pressure, cleaning a diversion chamber, putting rock plates with corresponding sizes into the diversion grooves, paving propping agents on the rock plates according to the previous sand paving concentration, and putting another rock plate on the rock plates after finishing paving and leveling. And loading the previous closing pressure value, and determining the corresponding crack width by using a displacement meter. The difference in the width of the two cracks is the depth of proppant embedded in the rock.
4) And (3) testing the long-term flow conductivity, and testing the flow conductivity for a period of up to a week or even a plurality of months under the condition of long-term pressure stabilization of the hydraulic device according to the test time requirement. The liquid or gas, the propping agent or the rock plate can be uniformly paved or not according to the network format, and the like can be selected, so that the experimental simulation range is wider and the functions are powerful.
Other parts not described in detail are prior art. Although the foregoing embodiments have been described in some, but not all, embodiments of the invention, it should be understood that other embodiments may be devised in accordance with the present embodiments without departing from the spirit and scope of the invention.
Claims (2)
1. The multifunctional network fracture conductivity testing system is used for testing radial conductivity, proppant crushing capability and strength, fracture width and proppant embedding depth and long-term conductivity; the method is characterized in that: the multifunctional network crack flow conductivity testing system comprises a multifunctional network crack flow conductivity meter (1) and a data acquisition system (2), wherein the data acquisition system (2) is respectively connected with a flow meter (3), a first pressure difference meter (4), a first displacement meter (5), a second displacement meter (6) and a second pressure difference meter (7); the multifunctional network crack flow guiding instrument (1) is respectively connected with the flow measuring instrument (3), the first displacement instrument (5), the second displacement instrument (6) and the second pressure difference instrument (7.1) through a flow pipeline (3.1), a first displacement pipeline (5.1), a second displacement pipeline (6) and a second pressure difference pipeline (7), the first pressure difference instrument (4) is connected with an intermediate container device (8) through the pressure difference pipeline (4.1), the other end of the intermediate container device (8) is divided into a pressure difference branch pipe A (4.11) and a pressure difference branch pipe B (4.12), the pressure difference branch pipe A (4.11) is sequentially connected with a advection pump (9) and a liquid tank (10), and the pressure difference branch pipe B (4.12) is connected with a high-pressure gas cylinder (11); a branch pipe (12) is connected to a second pressure difference pipeline (7.1) between the multifunctional network fracture flow guiding instrument (1) and the second pressure difference instrument (7), the branch pipe (12) is respectively connected with a vacuumizing system (13) and a back pressure device (14), and the back pressure device (14) is connected with a balance (15); the multifunctional network crack flow guiding instrument (1) comprises a base (1.1), a disc-shaped flow guiding chamber chassis (1.2) is arranged on the base (1.1), a flow guiding chamber central inlet (1.21) is formed in the center of the upper surface of the flow guiding chamber chassis (1.2), a circular ring-shaped filter screen (1.3) is sleeved on the peripheral surface of the flow guiding chamber chassis (1.2), a hollow cylindrical flow guiding chamber plunger (1.4) is arranged on the upper surface of the flow guiding chamber chassis (1.2), the flow guiding chamber plunger (1.4) is inserted and fixed on the flow guiding chamber central inlet (1.21), a flow guiding chamber shell (1.5) is sleeved outside the flow guiding chamber plunger (1.4), and the flow guiding chamber chassis (1.2) is connected with the flow guiding chamber shell (1.5) through threads; the flow guide chamber housing (1.5) is formed by stacking a plurality of cylinders with gradually reduced diameters, a flow hole (1.51) and a pressure difference hole (1.52) are formed in the outer wall of the cylinder at the bottommost part of the flow guide chamber housing (1.5), and concave holes (1.53) are symmetrically formed in the outer wall of the cylinder at the topmost part of the flow guide chamber housing (1.5) and are used for rotationally mounting the flow guide chamber housing (1.5); the flow hole (1.51) is connected with the flow meter (3) through a flow pipeline (3.1), and the pressure difference hole (1.52) is connected with a second pressure difference meter (7) through a second pressure difference pipeline (7.1); the flow hole (1.51) is connected with the pressure difference hole (1.52) through a collecting pipeline (21), and two ends of the collecting pipeline (21) are respectively connected with the flow pipeline (3.1) and the second pressure difference pipeline (7.1); the two symmetrical groove holes (1.53) are respectively connected with the first displacement instrument (5) and the second displacement instrument (6) through a first displacement pipeline (5.1) and a second displacement pipeline (6.1); the gas-liquid measuring device is characterized in that a gas-liquid inlet (1.11) is formed in the center of the side wall of the base (1.1), the gas-liquid inlet (1.11) is connected with a pressure difference pipeline (4.1) between the flowmeter (3) and the middle container device (8), heating holes (1.12) are symmetrically formed in the side wall of the base (1.1) on two sides of the gas-liquid inlet (1.11), the heating holes (1.12) are connected with a heating rod (17), and a hydraulic loading device (16) is arranged below the base (1.1); the differential pressure pipeline (4.1) is also connected with a second intermediate container device (8.1) in parallel, and valves (18) are connected to one side of the intermediate container device (8) and one side of the second intermediate container device (8.1); a liquid inlet valve (19) is arranged on a pressure difference branch pipe A (4.11) between the pressure difference pipeline (4.1) and the advection pump (9); an air inlet valve (20) is arranged on the pressure difference branch pipe B (4.12) between the pressure difference pipeline (4.1) and the high-pressure gas cylinder (11).
2. A method of detecting a fluid medium by the multi-functional network fracture conductivity test system of claim 1, wherein: the method comprises the following steps:
1) Placing a multifunctional network fracture flow guiding instrument (1) on a hydraulic loading device (16), closing an air inlet valve (20), opening a liquid inlet valve (19), enabling a fluid medium to enter a flow guiding chamber center inlet (1.21) through a flow measuring instrument (3) and a pressure difference instrument (4), diffusing from the center of a flow guiding chamber chassis (1.2) to the periphery, entering a flow hole (1.51) and a pressure difference hole (1.52), and testing outlet pressure;
2) Meanwhile, the multifunctional network fracture flow guiding instrument (1) is pressurized to a test standard pressure value step by step through the hydraulic loading device (16), and the thickness change of the propping agent is tested by utilizing the first displacement instrument (5) and the second displacement instrument (6); the data are automatically transmitted to a computer through a data acquisition system (2), and the diversion capacity at different moments is calculated according to the recorded data.
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| CN111060284B (en) * | 2020-01-02 | 2021-07-06 | 中海石油(中国)有限公司 | Testing device and method for simulating proppant backflow after fracture closure |
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