Functional proppant evaluation equipment and method

Abstract

The invention provides a functional proppant evaluation device and method, and belongs to the technical field of oil and gas exploitation, the functional proppant evaluation device comprises a gas pressurization system and a gas storage tank, the gas pressurization system comprises a mute air compressor and a gas booster pump, and a pressure gauge and a gas valve are installed between the mute air compressor and the gas booster pump. According to the evaluation device for the water control performance of the water control proppant in the fracturing treatment design of the high-water-content reservoir, the water control performance of the proppant is evaluated and researched by adopting a composite model through customized functional proppant performance evaluation, and the oil-water and gas-water two-phase permeation law is researched by adopting a mode of combining a high-pressure flow guide chamber model and a low-pressure visual model; independent experiment operation is not needed in the experiment for researching the selective seepage capacity of oil, gas and water in the functional proppant under the formation closing pressure, operation parameters of equipment are processed in cooperation with a functional proppant evaluation method, and guarantee is provided for optimization, laying concentration and laying scheme of the on-site fracturing construction proppant.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploitation, and in particular to a functional proppant evaluation device and method. Background Art

[0002] Proppant evaluation equipment is usually used to evaluate the performance of proppants in oil and gas production, including its mechanical behavior, fluid flow capacity and chemical stability under different conditions. These equipment can simulate the downhole environment and conduct a series of tests on proppants to ensure their effectiveness and safety in actual applications.

[0003] With the advancement of fracturing technology and the development of unconventional and tight oil and gas reservoirs, the corresponding fracture creation technology and diversion evaluation and water control proppant research are relatively complete, while the research on the performance evaluation of functional proppants is still in its infancy. The research results of the current simulation experiments are mostly experimental phenomena and qualitative experimental conclusions. In addition, the experiments to study the selective seepage capacity of oil, gas and water in functional proppants under formation closure pressure need to be carried out separately and independently, which has high labor intensity and cost, complicated operating procedures and is prone to experimental errors, which is not conducive to the optimization of functional proppants. Summary of the invention

[0004] The present invention proposes a functional proppant evaluation device and method, which solves the problem in the prior art that experiments to study the selective seepage capacity of oil, gas and water in functional proppants under formation closure pressure need to be performed separately and independently, the work intensity and cost are high, the operation procedures are complicated and experimental errors are prone to occur, which is not conducive to the optimization of functional proppants.

[0005] The technical solution of the present invention is implemented as follows: a functional proppant evaluation device, comprising a gas pressurization system and a gas storage tank, wherein the gas pressurization system comprises a silent air compressor and a gas booster pump, a pressure gauge and a gas valve are installed between the silent air compressor and the gas booster pump, and the gas pressurization system uses the silent air compressor to provide the driving pressure of the gas booster pump and transports the gas source to the gas storage tank;

[0006] The gas booster pump is equipped with a gas cylinder, and the opening of the gas storage tank is connected to a gas flow controller through a pipeline, and the gas flow controller is used to control the constant speed injection of the gas discharged from the gas storage tank;

[0007] An inlet press is installed at the outlet of the gas flow controller, a one-way valve is installed between the gas flow controller and the inlet press, the inlet press is a vertical integrated machine and is composed of an oil pump and a servo valve, and the inlet press is used to pressurize and pass oil into the pipeline;

[0008] Two groups of intermediate containers are provided on the outlet pipeline of the gas flow controller, and the number of each group of intermediate containers is two. A constant flow pump is installed on the bottom opening of each group of intermediate containers. The constant flow pump is used to connect to a water source and inject water into the intermediate container. The intermediate container is used to store the test medium to absorb the pressure difference fluctuation caused by the pressure fluctuation of the constant flow pump, improve the test accuracy of the pressure difference, and store the liquid for constant pressure displacement;

[0009] A high-pressure flow guide chamber or a low-pressure visual model is installed on the pipeline of the gas flow controller and the intermediate container through a pipeline;

[0010] The high pressure flow chamber is used to evaluate the compressive strength of the consolidated proppant and the proppant seepage characteristics;

[0011] The low-pressure visual model is used to observe the water-controlling, oil-permeable and air-permeable effects of the functional proppant;

[0012] A closing pressure loading system is installed at the bottom of the high-pressure guide chamber, and the closing pressure loading system is used to control the sealing closing pressure in the high-pressure guide chamber, and increase or reduce the pressure by hydraulic control;

[0013] A back pressure system is installed on the high-pressure diversion chamber through two sets of pipelines. The back pressure system consists of a high-precision back pressure automatic pump, a pump-valve integrated back pressure valve and a pressure sensor. The back pressure system is used to adjust the outlet pressure of the high-pressure diversion chamber;

[0014] The pump-valve integrated back-pressure valve and the low-pressure visual model are respectively connected to an outlet metering system through pipelines, and the outlet metering system is used to detect the three-phase separation metering of oil, gas and water.

[0015] As a further solution of the present invention: the gas source used by the gas boosting system is nitrogen, and the gas boosting ratio is 1:60, and the pressure regulating output range of the gas boosting pump is 0-41.5MPa.

[0016] As a further solution of the present invention: the gas flow controller includes a TESCOM gas pressure regulating valve, a pressure sensor, a Bronkhorst gas flow meter and a pipeline, and the gas control flow range of the gas flow controller is 0-2000ml / min.

[0017] As a further solution of the present invention: the pump head of the constant flow pump is made of 316L stainless steel, and a one-way valve is installed on the pipeline at the top of the intermediate container.

[0018] As a further solution of the present invention: the filling area in the high-pressure guide chamber is 190 mm long, 70 mm wide and 30 mm thick; the working pressure of the high-pressure guide chamber is 40 MPa, the pressure head stroke of the high-pressure guide chamber is 40 mm, an inlet and two outlets are respectively provided on both sides of the high-pressure guide chamber, filter plates are installed at the inlet and the two outlets, a pressure measuring hole is provided at the bottom of the high-pressure guide chamber, the closed pressure loading system is installed in the pressure measuring hole, and the high-pressure guide chamber is filled with raw sand, expanded clay and Fu Sheng sand, the raw sand is located on one side of the inlet, and the expanded clay and Fu Sheng sand are located on one side of the outlet.

[0019] As a further solution of the present invention: the low-pressure visual model is bidirectionally visible in the plane direction, and the visible dimensions are 600 mm in length, 400 mm in width, and 10 mm in thickness; the low-pressure visual model is filled with quartz sand and coated proppant, and the area of ​​the coated proppant is 500 mm in length, 120 mm in width, and 10 mm in thickness; the low-pressure visual model is composed of a transparent PC plate, a sealing gasket, a metal frame, a sealing gasket, and a transparent PC plate stacked in sequence and fastened with multiple bolts, the transparent PC plate is used to realize the visual function and compact the filling material, the sealing gasket is used to realize fluid sealing, and filter plates are installed on the inner side of the interfaces on both sides of the low-pressure visual model close to the filled samples.

[0020] As a further solution of the present invention: the volume of the high-precision back-pressure automatic pump in the back-pressure system is 3-5 ml, the maximum working pressure of the pump-valve integrated back-pressure valve is 50 MPa, and the measuring range of the pressure sensor is 40 MPa.

[0021] The present invention also proposes a method for evaluating a functional proppant, the method comprising the following steps:

[0022] By collecting the operating parameters of the functional proppant evaluation equipment or setting the parameters, the data collection dual-control system is established and operated in an Internet environment. The equipment workflow is displayed on the interface to achieve human-computer dialogue. The computer software automatically collects all permeability, pressure, flow, and export metering data, and the control operation is displayed in real time on the flow chart, and the data is remotely transmitted wirelessly.

[0023] The control system parameters are set according to different experimental models to realize the setting of each detection instrument in the equipment and the remote automatic control function. The data collected by the computer is processed to generate original data reports, analysis reports and curve graphs, and a database file is generated at the same time for users to call.

[0024] As a further solution of the present invention: when the workflow is in operation, the user sets the upper limit pressure. When the actual pressure reaches the upper limit pressure, the pump body in the equipment stops working. When the alarm parameter is triggered or any pressure exceeds the set value, an audible and visual alarm is issued, an alarm window pops up on the operation interface, the pump body stops working, the alarm is released, and the work starts again after pressing reset.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is an evaluation device for the water control performance of water-controlling proppants in the design of high-water-content reservoir fracturing treatment, and a composite model is used to evaluate the water control performance of proppants through customized functional proppant performance evaluation, and a high-pressure diversion chamber model and a low-pressure visual model are combined to study the oil-water and gas-water two-phase permeability laws. In addition, in the experiment of studying the selective seepage capacity of oil, gas and water in functional proppants under formation closure pressure, there is no need to conduct independent experimental operations. The operating parameters of the equipment are processed in conjunction with the functional proppant evaluation method, which provides guarantees for the optimization of proppants, laying concentrations and laying plans for on-site fracturing construction.

[0026] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation method of the embodiment of the present application is listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the embodiments of the present application. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A flow chart of the evaluation of the high-pressure diversion chamber model of the functional proppant evaluation equipment provided by the present invention;

[0029] Figure 2 A low-pressure visual model evaluation flow chart of the functional proppant evaluation equipment provided by the present invention;

[0030] In the figure: 1. Gas boosting system; 101. Silent air compressor; 102. Gas boosting pump; 2. Low-pressure visual model; 3. Gas cylinder; 4. Gas storage tank; 5. Gas flow controller; 6. Inlet pressure machine; 7. Intermediate container; 8. Constant flow pump; 9. High-pressure diversion chamber; 10. Closed pressure loading system; 11. Back pressure system; 12. Outlet metering system. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0032] Reference Figure 1-2 As shown, the present invention provides a technical solution: a functional proppant evaluation device and method to solve the problems existing in the above-mentioned prior art. The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Embodiment 1:

[0034] A functional proppant evaluation device comprises a gas pressurization system 1 and a gas storage tank 4, wherein the gas pressurization system 1 comprises a silent air compressor 101 and a gas booster pump 102, a pressure gauge and a gas valve are installed between the silent air compressor 101 and the gas booster pump 102, the gas pressurization system 1 uses the silent air compressor 101 to provide driving pressure for the gas booster pump 102 and delivers the gas source to the gas storage tank 4; the gas source used by the gas pressurization system 1 is nitrogen, and the gas pressurization ratio is 1:60, and the pressure regulation output range of the gas booster pump 102 is 0-41.5MPa;

[0035] The gas booster pump 102 is equipped with a gas cylinder 3, and the opening of the gas storage tank 4 is connected to a gas flow controller 5 through a pipeline. The gas flow controller 5 is used to control the constant speed injection of the gas discharged from the gas storage tank 4;

[0036] An inlet press 6 is installed at the outlet of the gas flow controller 5, a one-way valve is installed between the gas flow controller 5 and the inlet press 6, the inlet press 6 is a vertical integrated machine and is composed of an oil pump and a servo valve, and the inlet press 6 is used to pressurize and pass oil into the pipeline; the gas flow controller 5 includes a TESCOM gas pressure regulating valve, a pressure sensor, a Bronkhorst gas flow meter and a pipeline, and the gas control flow range of the gas flow controller 5 is 0-2000ml / min;

[0037] Two groups of intermediate containers 7 are provided on the outlet pipeline of the gas flow controller 5, and the number of each group of intermediate containers 7 is two. A constant flow pump 8 is installed at the bottom opening of each group of intermediate containers 7. The constant flow pump 8 is used to connect to a water source and inject water into the intermediate container 7. The intermediate container 7 is used to store the test medium to absorb the pressure difference fluctuation caused by the pressure fluctuation of the constant flow pump 8, improve the test accuracy of the pressure difference and store the liquid for constant pressure displacement; the pump head of the constant flow pump 8 is made of 316L stainless steel, and a one-way valve is installed on the pipeline at the top of the intermediate container 7;

[0038] The constant current pump 8 has a pressure measurement and over-voltage and under-voltage protection system, making the pump system safe and reliable. The constant current pump 8 working parameter setting adopts keyboard input and touch button operation, with four-digit data display, intuitive and convenient operation, and the constant current pump 8 has a communication interface with a microcomputer, and the operation of the constant current pump 8 can be directly controlled by the microcomputer. During the test, the test flow rate is automatically changed according to the set program, realizing the automation of the test process, and controlled and set by the computer, and the program can automatically set the flow rate and maintenance time, improving the convenience of operation.

[0039] A high-pressure flow guide chamber 9 or a low-pressure visual model 2 is installed on the pipeline of the gas flow controller 5 and the intermediate container 7 through a pipeline;

[0040] The high-pressure diversion chamber 9 is used to evaluate the compressive strength of the consolidated proppant and the seepage characteristics of the proppant; the filling area in the high-pressure diversion chamber 9 is 190 mm long, 70 mm wide and 30 mm thick; the working pressure of the high-pressure diversion chamber 9 is 40 MPa, the pressure head stroke of the high-pressure diversion chamber 9 is 40 mm, an inlet and two outlets are respectively provided on both sides of the high-pressure diversion chamber 9, filter plates are installed at the inlet and the two outlets, a pressure measuring hole is provided at the bottom of the high-pressure diversion chamber 9, and a closed pressure loading system 10 is installed in the pressure measuring hole. The high-pressure diversion chamber 9 is filled with raw sand, ceramsite and Fusheng sand, the raw sand is located on one side of the inlet, and the ceramsite and Fusheng sand are located on one side of the outlet;

[0041] The low-pressure visual model 2 is used to observe the water-controlling, oil-permeable and air-permeable effects of the functional proppant; the low-pressure visual model 2 is bidirectionally visible in the plane direction, and the visible dimensions are 600 mm long, 400 mm wide and 10 mm thick; the low-pressure visual model 2 is filled with quartz sand and coated proppant, and the coated proppant area is 500 mm long, 120 mm wide and 10 mm thick; the low-pressure visual model 2 is composed of a transparent PC plate, a sealing gasket, a metal frame, a sealing gasket and a transparent PC plate stacked in sequence, and fastened with multiple bolts, the transparent PC plate is used to realize the visual function and compaction of the filling material, the sealing gasket is used to realize fluid sealing, and filter plates are installed on the inner side of the interface on both sides of the low-pressure visual model 2 near the filling sample;

[0042] A closing pressure loading system 10 is installed at the bottom of the high-pressure guide chamber 9. The closing pressure loading system 10 is used to control the sealing closing pressure in the high-pressure guide chamber 9 and increase or reduce the pressure by hydraulic control;

[0043] A back pressure system 11 is installed on the high-pressure diversion chamber 9 through two sets of pipelines. The back pressure system 11 consists of a high-precision back pressure automatic pump, a pump-valve integrated back pressure valve and a pressure sensor. The back pressure system 11 is used to adjust the outlet pressure of the high-pressure diversion chamber 9; the volume of the high-precision back pressure automatic pump in the back pressure system 11 is 3-5ml, the maximum working pressure of the pump-valve integrated back pressure valve is 50MPa, and the range of the pressure sensor is 40MPa.

[0044] The pump-valve integrated back pressure valve and the low pressure visual model 2 are respectively connected to the outlet metering system 12 through pipelines, and the outlet metering system 12 is used to detect the three-phase separation metering of oil, gas and water;

[0045] The outlet metering system 12 adopts a volumetric automatic reciprocating metering system to output instantaneous flow and cumulative flow. The outlet flow is automatically measured online. The liquid density at different temperatures is calculated in real time using a formula to ensure the accuracy of the volume of the output liquid. The computer collects and calculates the data in real time and displays it on the monitor immediately.

[0046] Embodiment 2:

[0047] A method for evaluating a functional proppant comprises the following steps:

[0048] By collecting the operating parameters of the functional proppant evaluation equipment or setting the parameters, the data collection dual-control system is established and operated in an Internet environment. The equipment workflow is displayed on the interface to achieve human-computer dialogue. The computer software automatically collects all permeability, pressure, flow, and export metering data, and the control operation is displayed in real time on the flow chart, and the data is remotely transmitted wirelessly.

[0049] The control system parameters are set according to different experimental models to realize the setting of each detection instrument in the equipment and the remote automatic control function. The data collected by the computer is processed to generate original data reports, analysis reports and curve graphs, and a database file is generated at the same time for users to call.

[0050] When the workflow is running, the user sets the upper limit pressure. When the actual pressure reaches the upper limit pressure, the pump in the equipment stops working. When the alarm parameter is triggered or any pressure exceeds the set value, an audible and visual alarm is issued, and an alarm window pops up on the operation interface. The pump stops working, the alarm is released, and it starts working again after pressing reset.

[0051] From the above, we know that: through the customized functional proppant performance evaluation, a composite model is used to evaluate the water control performance of the proppant, and the high-pressure diversion chamber 9 model and the low-pressure visual model 2 are combined to study the oil-water and gas-water two-phase permeability laws. In addition, in the experiment of studying the selective seepage ability of oil, gas and water in the functional proppant under the formation closure pressure, there is no need to conduct independent experimental operations. The operating parameters of the equipment are processed in conjunction with the functional proppant evaluation method, which provides guarantees for the optimization of proppant, laying concentration and laying plan for on-site fracturing construction.

[0052] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A functional proppant evaluation device, comprising a gas pressurization system (1) and a gas storage tank (4), characterized in that: The gas boosting system (1) comprises a silent air compressor (101) and a gas boosting pump (102), a pressure gauge and a gas valve are installed between the silent air compressor (101) and the gas boosting pump (102), and the gas boosting system (1) uses the silent air compressor (101) to provide driving pressure for the gas boosting pump (102) and to deliver the gas source to the gas storage tank (4); The gas booster pump (102) is provided with a gas cylinder (3), and the opening of the gas storage tank (4) is connected to a gas flow controller (5) via a pipeline, and the gas flow controller (5) is used to control the constant speed injection of gas discharged from the gas storage tank (4); An inlet press (6) is installed at the outlet of the gas flow controller (5), a one-way valve is installed between the gas flow controller (5) and the inlet press (6), the inlet press (6) is a vertical integrated machine and is composed of an oil pump and a servo valve, and the inlet press (6) is used to pressurize and pass oil into the pipeline; Two groups of intermediate containers (7) are provided on the outlet pipeline of the gas flow controller (5), and the number of each group of intermediate containers (7) is two. A constant flow pump (8) is installed at the bottom opening of each group of intermediate containers (7). The constant flow pump (8) is used to connect to a water source and inject water into the intermediate container (7). The intermediate container (7) is used to store the test medium to absorb the pressure difference fluctuation caused by the pressure fluctuation of the constant flow pump (8), thereby improving the test accuracy of the pressure difference and storing the liquid for constant pressure displacement; A high-pressure flow guide chamber (9) or a low-pressure visual model (2) is installed on the pipeline of the gas flow controller (5) and the intermediate container (7) through a pipeline; The high pressure flow chamber (9) is used to evaluate the compressive strength of the consolidated proppant and the proppant seepage characteristics; The low-pressure visual model (2) is used to observe the water-controlling, oil-permeable and air-permeable effects of the functional proppant; A closing pressure loading system (10) is installed at the bottom of the high-pressure flow guiding chamber (9), and the closing pressure loading system (10) is used to control the sealing closing pressure in the high-pressure flow guiding chamber (9) and increase or reduce the pressure by hydraulic control; A back pressure system (11) is installed on the high pressure flow guiding chamber (9) via two sets of pipelines. The back pressure system (11) is composed of a high-precision back pressure automatic pump, a pump-valve integrated back pressure valve, and a pressure sensor. The back pressure system (11) is used to adjust the outlet pressure of the high pressure flow guiding chamber (9); The pump-valve integrated back-pressure valve and the low-pressure visual model (2) are respectively connected to an outlet metering system (12) through pipelines, and the outlet metering system (12) is used to detect the three-phase separation metering of oil, gas and water.

2. A functional proppant evaluation device according to claim 1, characterized in that: The gas source used by the gas boosting system (1) is nitrogen, and the gas boosting ratio is 1:

60. The pressure regulating output range of the gas boosting pump (102) is 0-41.5 MPa.

3. A functional proppant evaluation device according to claim 1, characterized in that: The gas flow controller (5) comprises a TESCOM gas pressure regulating valve, a pressure sensor, a Bronkhorst gas flow meter and a pipeline. The gas flow control range of the gas flow controller (5) is 0-2000 ml / min.

4. A functional proppant evaluation device according to claim 1, characterized in that: The pump head of the constant flow pump (8) is made of 316L stainless steel, and a one-way valve is installed on the pipeline at the top of the intermediate container (7).

5. A functional proppant evaluation device according to claim 1, characterized in that: The filling area in the high-pressure diversion chamber (9) is 190 mm long, 70 mm wide and 30 mm thick; the working pressure of the high-pressure diversion chamber (9) is 40 MPa, the pressure head stroke of the high-pressure diversion chamber (9) is 40 mm, an inlet and two outlets are respectively provided on both sides of the high-pressure diversion chamber (9), filter plates are installed at the inlet and the two outlets, a pressure measuring hole is provided at the bottom of the high-pressure diversion chamber (9), and the closed pressure loading system (10) is installed in the pressure measuring hole. The high-pressure diversion chamber (9) is filled with raw sand, ceramsite and Fusheng sand, the raw sand is located on one side of the inlet, and the ceramsite and Fusheng sand are located on one side of the outlet.

6. A functional proppant evaluation device according to claim 1, characterized in that: The low-pressure visual model (2) is bidirectionally visible in the plane direction, and the visible dimensions are 600 mm in length, 400 mm in width, and 10 mm in thickness; the low-pressure visual model (2) is filled with quartz sand and coated proppant, and the area of ​​the coated proppant is 500 mm in length, 120 mm in width, and 10 mm in thickness; the low-pressure visual model (2) is composed of a transparent PC plate, a sealing gasket, a metal frame, a sealing gasket, and a transparent PC plate stacked in sequence, and fastened with multiple bolts, the transparent PC plate is used to realize the visual function and compact the filling material, the sealing gasket is used to realize fluid sealing, and filter plates are installed on the inner side of the interface on both sides of the low-pressure visual model (2) near the filling sample.

7. A functional proppant evaluation device according to claim 1, characterized in that: The volume of the high-precision automatic back-pressure pump in the back-pressure system (11) is 3-5 ml, the maximum working pressure of the pump-valve integrated back-pressure valve is 50 MPa, and the measuring range of the pressure sensor is 40 MPa.

8. A method for evaluating a functional proppant, a functional proppant evaluation device according to any one of claims 1 to 7, characterized in that: The evaluation method comprises the following steps: By collecting the operating parameters of the functional proppant evaluation equipment or setting the parameters, the data collection dual-control system is established and operated in an Internet environment. The equipment workflow is displayed on the interface to achieve human-computer dialogue. The computer software automatically collects all permeability, pressure, flow, and export metering data, and the control operation is displayed in real time on the flow chart, and the data is remotely transmitted wirelessly. The control system parameters are set according to different experimental models to realize the setting of each detection instrument in the equipment and the remote automatic control function. The data collected by the computer is processed to generate original data reports, analysis reports and curve graphs, and a database file is generated at the same time for users to call.

9. A method for evaluating a functional proppant according to claim 8, characterized in that: When the workflow is in operation, the user sets the upper limit pressure. When the actual pressure reaches the upper limit pressure, the pump in the equipment stops working. When the alarm parameter is triggered or any pressure exceeds the set value, an audible and visual alarm is issued, an alarm window pops up on the operation interface, and the pump stops working. The alarm is released and the system restarts after pressing reset.

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