Shale gas reservoir propping agent fracture conductivity testing device and use method

Abstract

The invention discloses a shale gas reservoir proppant fracture conductivity testing device and a using method, and relates to the technical field of petroleum engineering, the shale gas reservoir proppant fracture conductivity testing device comprises a conductivity testing device and a data acquisition module, and the data acquisition module is used for acquiring pressure data, flow data and temperature data in the testing process of the conductivity testing device. Pressure, flow and temperature data in the testing process are accurately acquired through the integrated data acquisition module, the actual stratum condition can be comprehensively simulated by combining a pressure applying device, a fluid injection and output system and oil liquid supply with the adjustable temperature in the flow guide testing device, and meanwhile, the flow guide testing device can be used for testing the pressure, the flow and the temperature. Through the arrangement of the upper fixing plate and the pressure applying device, the upper simulation rock stratum and the lower simulation rock stratum are used for clamping the proppant, and the pressure sensor is arranged in the proppant layer in an embedded mode, so that accurate testing and analysis of the fracture conductivity of the proppant are achieved, and reliable data support is provided for effective development of a shale gas reservoir.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum engineering, and in particular to a shale gas reservoir proppant fracture conductivity testing device and a use method thereof. Background Art

[0002] Shale gas reservoir refers to a natural gas reservoir enriched and produced in shale lithology. It has extremely high gas content and rich resource potential. Shale gas reservoirs usually have low permeability. In order to effectively exploit shale gas, fracturing technology is needed to form cracks and increase the permeability of the reservoir. During the fracturing process, high-pressure fluid is injected into the reservoir to form cracks, and then proppant is injected to keep the cracks open, thereby improving the flow capacity of the gas.

[0003] The defects of existing proppant fracture conductivity are: 1. Patent document US09557254B2 discloses a portable device and a method for testing proppants on site. However, the above document lacks a structure that can accurately collect test process data, and cannot achieve the technical problem of accurately testing and analyzing the proppant fracture diversion energy; 2. Patent document US20120156787A1 discloses a laboratory test procedure for selecting acidic or proppant fracturing stimulation treatment for a given carbonate formation. However, the laboratory test procedure in the above document is difficult to conveniently disassemble and replace simulated rock formations of different shapes and types, resulting in a technical problem of a small range of data obtained; 3. Patent document US07712525B2 discloses a method for determining the optimal closing time of proppant particles coated with cured resin. However, the test device in the above document cannot evacuate the flow chamber, which may easily lead to technical problems such as errors in the experimental results. 4. Patent document CN111474078A discloses a method and device for evaluating the conductivity of proppant under acid etching conditions. However, the test device in the above document has difficulty in adjusting the temperature of the oil. Testing with oil at different temperatures has a technical problem of errors in the obtained data. Summary of the invention

[0004] The purpose of the present invention is to provide a shale gas reservoir proppant fracture conductivity testing device and a use method to solve the technical problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a shale gas reservoir proppant fracture conductivity testing device, comprising a conductivity testing device and a data acquisition module, wherein the data acquisition module is used to collect pressure data, flow data and temperature data during the test of the conductivity testing device, and send the collected data to a processor module for analysis and processing; The diversion test device comprises a diversion chamber, a pressure applying device is installed on the top of the diversion chamber, a fluid injection pipe is installed through one end of the diversion chamber, a fluid output pipe is installed on the other end of the diversion chamber, flow sensors are installed on the ends of the fluid injection pipe and the fluid output pipe close to the diversion chamber, an input pump is installed on the other end of the fluid injection pipe, the input end of the input pump is connected to a temperature regulating container through a pipeline, a temperature sensor is embedded on the inner wall of the temperature regulating container, a third water pump is connected to the top of the outer wall of the temperature regulating container through a pipeline, and an oil tank is installed on the input end of the third water pump; The inner bottom wall of the guide chamber is movably connected to a lower fixed plate, the top of the lower fixed plate is movably connected to a lower simulated rock formation, the output end of the pressure applying device is fixedly connected to an upper fixed plate, the bottom of the upper fixed plate is movably connected to an upper simulated rock formation, proppant is filled between the lower simulated rock formation and the upper simulated rock formation, and pressure sensors are embedded in the middle and edge positions of the proppant layer between the lower simulated rock formation and the upper simulated rock formation.

[0006] Preferably, a plurality of first connecting holes are provided on the top edge of the lower fixed plate, the inner wall of the first connecting hole is movably connected with the first connecting block, and the top of the first connecting block is installed on the bottom of the lower simulated rock formation, and a group of first limiting grooves are provided on the outer wall of the first connecting block, a first pressure spring is installed inside the first limiting groove, one end of the first pressure spring is movably connected with the first limiting block, and the tail end of the outer wall of the first limiting block is movably connected to the inner wall of the first limiting groove, the front end of the outer wall of the first limiting block is movably connected to the inner wall of the limiting hole, and the limiting hole is provided on the inner wall of the first connecting hole.

[0007] Preferably, a plurality of second connecting holes are opened on the bottom edge of the upper fixed plate, the inner wall of the second connecting hole is movably connected with a second connecting block, and the bottom of the second connecting block is installed on the top of the upper simulated rock formation, a second limiting groove is opened on one side of the outer wall of the second connecting block, a second pressure spring is installed inside the second limiting groove, one end of the second pressure spring is movably connected with the second limiting block, and the tail end of the outer wall of the second limiting block is movably connected to the inner wall of the second limiting groove, the front end of the outer wall of the second limiting block is movably connected to the inner wall of the through hole, and one end of the through hole is opened on the inner wall of the second connecting hole, and the other end of the through hole is opened on the outer wall of the upper fixed plate.

[0008] Preferably, the inner wall of the through hole is movably connected to a moving block, a group of sliding grooves are opened on the inner wall of the through hole, the inner wall of the sliding groove is movably connected to a sliding block, and one end of the sliding block is installed on the outer wall of the moving block, a fixing rod is installed on the inner wall of the sliding groove, and the outer wall of the fixing rod passes through one end of the sliding block, the outer wall of the fixing rod is movably connected to a third pressure spring, and one end of the third pressure spring is movably connected to one end of the sliding block.

[0009] Preferably, the pressure applying device includes a fixing frame, and the fixing frame is installed on the top of the guide chamber, a plurality of hydraulic telescopic cylinders are installed on the top of the fixing frame, and the output ends of the hydraulic telescopic cylinders are installed on the top of the upper fixed plate.

[0010] Preferably, the outer walls of the fluid output pipe and the fluid injection pipe are both wrapped with an insulation layer, a three-way valve is installed at one end of the fluid output pipe, a liquid collection tank is installed at the first output end of the three-way valve, and a vacuum pump is installed at the second output end of the three-way valve.

[0011] Preferably, a heating tube and a refrigeration tube are respectively wound around the outer wall of the temperature regulating container, a first water pump is installed at one end of the heating tube, an input end of the first water pump is connected to a heating tank through a pipeline, and the top of the outer wall of the heating tank is installed on the other end of the heating tube, and a plurality of electric heating rods are embedded and installed at the bottom of the heating tank.

[0012] Preferably, a second water pump is installed at one end of the refrigeration pipe, the input end of the second water pump is connected to a refrigeration tank through a pipeline, and the top of the outer wall of the refrigeration tank is installed on the other end of the refrigeration pipe, a refrigerator shell is installed on one side of the refrigeration tank, a refrigeration plate is installed on one side of the inner wall of the refrigerator shell, and one side of the refrigeration plate is installed on the outer wall of the refrigeration tank, a fan is installed in the middle of the inner wall of the refrigerator shell, a plurality of vents are opened on the outer wall of the refrigerator shell, and a protective net is installed on the other side of the refrigerator shell.

[0013] Preferably, the working steps of the shale gas reservoir proppant fracture conductivity testing device are as follows: S1. The upper simulated rock formation is installed on the bottom of the upper fixed plate through the second connecting block and the second connecting hole. The pressure applying device is driven to press down the upper simulated rock formation, and proppant is filled between the lower simulated rock formation and the upper simulated rock formation, and pressure sensors are embedded in the middle and edge positions of the proppant layer; S2, start the third water pump to transfer the oil from the oil tank to the temperature adjustment container for temperature adjustment, and obtain temperature data in real time through the temperature sensor. After the temperature reaches the standard, start the input pump to inject the temperature-adjusted oil into the diversion chamber through the fluid injection pipe; S3, starting the pressure applying device again, applying gradually increasing pressure to the upper simulated rock formation to simulate the pressure conditions of the underground reservoir, and collecting and recording the readings of the pressure sensor in real time through the data acquisition module to monitor the pressure distribution at different positions in the proppant layer; S4. After passing through the proppant layer, the oil will be discharged through the fluid output pipe. At the same time, the data acquisition module continues to collect and record the readings of the flow sensor near the fluid output pipe, as well as the data of the temperature sensor and the pressure sensor.

[0014] Preferably, the step S2 further includes the following steps: S21. Observe and record the readings of the flow sensor to monitor the flow rate of the injected fluid.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention accurately collects pressure, flow and temperature data during the test process through an integrated data acquisition module, and is combined with a pressure applying device, a fluid injection and output system, and an oil supply with adjustable temperature in the diversion test device to fully simulate actual formation conditions. At the same time, through the arrangement of an upper fixed plate and a pressure applying device, the proppant is clamped by the upper simulated rock layer and the lower simulated rock layer, and a pressure sensor is embedded in the proppant layer, so that accurate testing and analysis of the diversion capacity of the proppant fracture is achieved, providing reliable data support for the effective development of shale gas reservoirs; 2. The present invention realizes quick installation and disassembly between the lower and upper simulated rock layers, respectively, by respectively arranging connection structures with the first and second connection holes on the lower and upper fixed plates, and by utilizing the first and second pressure springs and the corresponding limiting blocks, limiting grooves and through holes. Thus, different lower and upper simulated rock layers can be easily replaced according to usage requirements, thereby effectively broadening the scope of experimental data collection and providing a richer and more accurate empirical basis for in-depth analysis of the conductivity performance of proppants in fractures. 3. The present invention is stably installed on the top of the diversion chamber through a fixed frame, and uses multiple hydraulic telescopic cylinders to apply precise and controllable pressure to the upper fixed plate to simulate the formation pressure conditions. At the same time, the outer walls of the fluid output pipe and the fluid injection pipe are wrapped with an insulation layer to effectively reduce heat loss and ensure the stability of the fluid temperature. A three-way valve is configured at one end of the fluid output pipe, which is not only convenient for introducing the fluid into the liquid collection tank for collection and analysis, but also can be connected to a vacuum pump to achieve vacuum processing, which can prevent the air in the diversion chamber from affecting the experimental results; 4. The present invention realizes precise control of the temperature in the container by respectively winding a heating tube and a refrigeration tube around the outer wall of the temperature regulating container. A first water pump connected to one end of the heating tube circulates the hot water in the heating tank to the heating tube, and an electric heating rod at the bottom of the heating tank ensures that the hot water continuously maintains the required temperature. At the same time, a second water pump connected to one end of the refrigeration tube circulates the coolant in the refrigeration tank to the refrigeration tube. The refrigeration tank accelerates the refrigeration process through the combined action of the refrigeration plate and the fan in the refrigerator shell on one side, thereby providing an ideal temperature control environment for the solution in the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the overall structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle; Figure 4 It is a schematic diagram of the structure of the upper fixing plate of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at B in the middle; Figure 6 It is a schematic diagram of the structure of the refrigerator housing of the present invention; Figure 7 It is a schematic diagram of the data acquisition process of the data acquisition module of the present invention; Figure 8 It is a schematic diagram of the workflow of the present invention.

[0017] In the figure: 1, data acquisition module; 2, processor module; 3, diversion chamber; 4, pressure applying device; 5, fluid injection pipe; 6, fluid output pipe; 7, flow sensor; 8, input pump; 9, temperature regulating container; 10, temperature sensor; 11, oil tank; 12, lower fixing plate; 13, lower simulated rock formation; 14, upper fixing plate; 15, upper simulated rock formation; 16, proppant; 17, pressure sensor; 18, first connecting hole; 19, first connecting block; 20, first limiting groove; 21, first pressure spring; 22, first limiting block; 23, limiting hole; 25, second connecting hole; 26, second connecting block; 27. Second limiting groove; 28. Second pressure spring; 29. ​​Second limiting block; 30. Through hole; 31. Moving block; 32. Slide groove; 33. Sliding block; 34. Fixed rod; 35. Third pressure spring; 36. Fixed frame; 37. Hydraulic telescopic cylinder; 38. Insulation layer; 39. Three-way valve; 40. Liquid collecting tank; 41. Vacuum pump; 42. Heating pipe; 43. First water pump; 44. Heating tank; 45. Electric heating rod; 46. Second water pump; 47. Refrigeration tank; 48. Refrigeration housing; 49. Fan; 50. Vent; 51. Protective net; 52. Refrigeration plate; 53. Refrigeration pipe; 54. Third water pump. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example 1: Please refer to Figure 1 , Figure 2 and Figure 7 , an embodiment provided by the present invention: a shale gas reservoir proppant fracture conductivity testing device, comprising a conductivity testing device and a data acquisition module 1, wherein the data acquisition module 1 is used to collect pressure data, flow data and temperature data during the test of the conductivity testing device, and send the collected data to a processor module 2 for analysis and processing; The diversion test device comprises a diversion chamber 3, a pressure applying device 4 is installed on the top of the diversion chamber 3, a fluid injection pipe 5 is installed through one end of the diversion chamber 3, a fluid output pipe 6 is installed on the other end of the diversion chamber 3, a flow sensor 7 is installed on the end of the fluid injection pipe 5 and the fluid output pipe 6 close to the diversion chamber 3, an input pump 8 is installed on the other end of the fluid injection pipe 5, the input end of the input pump 8 is connected to a temperature regulating container 9 through a pipeline, a temperature sensor 10 is embedded and installed on the inner wall of the temperature regulating container 9, the top of the outer wall of the temperature regulating container 9 is connected to a third water pump 54 through a pipeline, and an oil tank 11 is installed on the input end of the third water pump 54; The inner bottom wall of the flow guiding chamber 3 is movably connected with a lower fixed plate 12, the top of the lower fixed plate 12 is movably connected with a lower simulated rock layer 13, the output end of the pressure applying device 4 is fixedly connected with an upper fixed plate 14, the bottom of the upper fixed plate 14 is movably connected with an upper simulated rock layer 15, a proppant 16 is filled between the lower simulated rock layer 13 and the upper simulated rock layer 15, and the middle and edge positions of the proppant 16 layer between the lower simulated rock layer 13 and the upper simulated rock layer 15 are embedded with pressure sensors 17; Furthermore, the integrated data acquisition module 1 accurately collects the pressure, flow and temperature data during the test. Combined with the pressure applying device 4, the fluid injection and output system and the temperature-adjustable oil supply in the diversion test device, the actual formation conditions can be fully simulated. At the same time, through the setting of the upper fixed plate 14 and the pressure applying device 4, the proppant 16 is clamped by the upper simulated rock layer 15 and the lower simulated rock layer 13, and the pressure sensor 17 is embedded in the proppant 16 layer, which realizes the accurate test and analysis of the diversion capacity of the proppant 16 fracture, and provides reliable data support for the effective development of shale gas reservoirs.

[0022] Example 2: Please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 , an embodiment provided by the present invention: a plurality of first connection holes 18 are opened on the top edge of the lower fixing plate 12, a first connection block 19 is movably connected to the inner wall of the first connection hole 18, and the top of the first connection block 19 is installed at the bottom of the lower simulated rock layer 13, a group of first limiting grooves 20 are opened on the outer wall of the first connection block 19, a first pressure spring 21 is installed inside the first limiting groove 20, one end of the first pressure spring 21 is movably connected to the first limiting block 22, and the tail end of the outer wall of the first limiting block 22 is movably connected to the inner wall of the first limiting groove 20, the front end of the outer wall of the first limiting block 22 is movably connected to the inner wall of the limiting hole 23, and the limiting hole 23 is opened on the inner wall of the first connection hole 18; A plurality of second connection holes 25 are provided at the bottom edge of the upper fixed plate 14, and a second connection block 26 is movably connected to the inner wall of the second connection hole 25, and the bottom of the second connection block 26 is installed on the top of the upper simulated rock layer 15, and a second limiting groove 27 is provided on one side of the outer wall of the second connection block 26, and a second pressure spring 28 is installed inside the second limiting groove 27, and one end of the second pressure spring 28 is movably connected to the second limiting block 29, and the tail end of the outer wall of the second limiting block 29 is movably connected to the inner wall of the second limiting groove 27, and the front end of the outer wall of the second limiting block 29 is movably connected to the inner wall of the through hole 30, and one end of the through hole 30 is opened on the inner wall of the second connection hole 25, and the other end of the through hole 30 is opened on the outer wall of the upper fixed plate 14; The inner wall of the through hole 30 is movably connected with a moving block 31, and a group of slide grooves 32 are opened on the inner wall of the through hole 30. The inner wall of the slide groove 32 is movably connected with a slider 33, and one end of the slider 33 is installed on the outer wall of the moving block 31. A fixing rod 34 is installed on the inner wall of the slide groove 32, and the outer wall of the fixing rod 34 passes through one end of the slider 33. The outer wall of the fixing rod 34 is movably connected with a third pressure spring 35, and one end of the third pressure spring 35 is movably connected to one end of the slider 33. Furthermore, by respectively arranging a connection structure with a first connection hole 18 and a second connection hole 25 on the lower fixing plate 12 and the upper fixing plate 14, and by utilizing the first and second pressure springs 28 and the corresponding limiting blocks, limiting grooves and through holes 30, the lower simulated rock layer 13 and the upper simulated rock layer 15 can be quickly installed and disassembled from the lower fixing plate 12 and the upper fixing plate 14, respectively, so that different lower simulated rock layers 13 and upper simulated rock layers 15 can be easily replaced according to usage requirements, thereby effectively broadening the scope of experimental data collection and providing a richer and more accurate empirical basis for in-depth analysis of the conductivity performance of the proppant 16 in the fracture. Through the coordinated use of the upper fixed plate 14, the through hole 30, the moving block 31, the slide groove 32, the slider 33, the fixed rod 34 and the third pressure spring 35, by simply pushing the moving block 31 to make it slide smoothly in the through hole 30, the precise coordination of the slide groove 32 and the slider 33 effectively enhances the stability of the movement, thereby driving the second limiting block 29 to accurately move into the second limiting groove 27, thereby realizing a stable and convenient disassembly operation of the upper simulated rock layer 15, thereby not only ensuring the firmness of the upper simulated rock layer 15 during installation, but also greatly improving its convenience when it needs to be replaced.

[0023] Example 3: Please refer to Figure 1 and Figure 2 , an embodiment provided by the present invention: the pressure applying device 4 includes a fixing frame 36, and the fixing frame 36 is installed on the top of the guide chamber 3, a plurality of hydraulic telescopic cylinders 37 are installed on the top of the fixing frame 36, and the output end of the hydraulic telescopic cylinder 37 is installed on the top of the upper fixed plate 14; The outer walls of the fluid output pipe 6 and the fluid injection pipe 5 are both wrapped with a heat-insulating layer 38, a three-way valve 39 is installed at one end of the fluid output pipe 6, a liquid collection tank 40 is installed at the first output end of the three-way valve 39, and a vacuum pump 41 is installed at the second output end of the three-way valve 39; Furthermore, the fixing frame 36 is firmly installed on the top of the diversion chamber 3, and a plurality of hydraulic telescopic cylinders 37 are used to apply precise and controllable pressure to the upper fixing plate 14 to simulate the formation pressure conditions. At the same time, the outer walls of the fluid output pipe 6 and the fluid injection pipe 5 are wrapped with an insulation layer 38 to effectively reduce heat loss and ensure the stability of the fluid temperature. A three-way valve 39 is arranged at one end of the fluid output pipe 6, which not only facilitates the introduction of the fluid into the liquid collection tank 40 for collection and analysis, but also can achieve vacuum treatment by connecting a vacuum pump 41, which can prevent the air in the diversion chamber 3 from affecting the experimental results.

[0024] Example 4: Please refer to Figure 1 , Figure 2 and Figure 6 , an embodiment provided by the present invention: the outer wall of the temperature regulating container 9 is respectively wound with a heating tube 42 and a refrigeration tube 53, a first water pump 43 is installed at one end of the heating tube 42, the input end of the first water pump 43 is connected to a heating tank 44 through a pipeline, and the top of the outer wall of the heating tank 44 is installed at the other end of the heating tube 42, and a plurality of electric heating rods 45 are embedded and installed at the bottom of the heating tank 44; A second water pump 46 is installed at one end of the refrigeration pipe 53, and the input end of the second water pump 46 is connected to a refrigeration tank 47 through a pipeline, and the top of the outer wall of the refrigeration tank 47 is installed on the other end of the refrigeration pipe 53, a refrigerator shell 48 is installed on one side of the refrigeration tank 47, a refrigeration plate 52 is installed on one side of the inner wall of the refrigerator shell 48, and one side of the refrigeration plate 52 is installed on the outer wall of the refrigeration tank 47, a fan 49 is installed in the middle of the inner wall of the refrigerator shell 48, a plurality of vents 50 are opened on the outer wall of the refrigerator shell 48, and a protective net 51 is installed on the other side of the refrigerator shell 48; Furthermore, by winding the heating tube 42 and the cooling tube 53 respectively around the outer wall of the temperature regulating container 9, precise control of the temperature inside the container is achieved. The first water pump 43 connected to one end of the heating tube 42 circulates the hot water in the heating tank 44 to the heating tube 42, and the electric heating rod 45 at the bottom of the heating tank 44 ensures that the hot water continues to maintain the required temperature. At the same time, the second water pump 46 connected to one end of the cooling tube 53 circulates the coolant in the cooling tank 47 to the cooling tube 53. The cooling tank 47 accelerates the cooling process through the joint action of the cooling plate 52 and the fan 49 in the refrigerator shell 48 on one side, thereby providing an ideal temperature control environment for the solution in the container.

[0025] Example 5: Please refer to Figure 8 , an embodiment provided by the present invention: the working steps of the shale gas reservoir proppant fracture conductivity testing device are as follows: S1, the upper simulated rock layer 15 is installed at the bottom of the upper fixed plate 14 through the second connecting block 26 and the second connecting hole 25, the pressure applying device 4 is driven to press down the upper simulated rock layer 15, and the proppant 16 is filled between the lower simulated rock layer 13 and the upper simulated rock layer 15, and the pressure sensor 17 is embedded in the middle and edge positions of the proppant 16 layer; S2, start the third water pump 54, transport the oil from the oil tank 11 to the temperature adjustment container 9 for temperature adjustment, and obtain temperature data in real time through the temperature sensor 10. After the temperature reaches the standard, start the input pump 8 to inject the temperature-adjusted oil into the guide chamber 3 through the fluid injection pipe 5; S3, start the pressure applying device 4 again, apply gradually increasing pressure to the upper simulated rock layer 15, simulate the pressure condition of the underground reservoir, and collect and record the reading of the pressure sensor 17 in real time through the data acquisition module 1 to monitor the pressure distribution at different positions in the proppant 16 layer; S4, after the oil passes through the proppant 16 layer, it will be discharged through the fluid output pipe 6. At the same time, the data acquisition module 1 continues to collect and record the reading of the flow sensor 7 near the fluid output pipe 6, as well as the data of the temperature sensor 10 and the pressure sensor 17; S5, a three-way valve 39 is arranged at one end of the fluid output pipe 6, which is not only convenient for introducing the fluid into the liquid collection tank 40 for collection and analysis, but also can realize vacuum treatment by connecting the vacuum pump 41; The step S2 also includes the following steps: S21. Observe and record the reading of the flow sensor 7 to monitor the flow rate of the injected fluid.

[0026] Working principle: The pressure, flow and temperature data during the test are accurately collected through the integrated data acquisition module 1. Combined with the pressure applying device 4, the fluid injection and output system and the temperature-adjustable oil supply in the diversion test device, the actual formation conditions can be fully simulated. At the same time, through the setting of the upper fixed plate 14 and the pressure applying device 4, the proppant 16 is clamped by the upper simulated rock layer 15 and the lower simulated rock layer 13, and the pressure sensor 17 is embedded in the proppant 16 layer, so as to achieve accurate testing and analysis of the diversion capacity of the proppant 16 fracture, and provide reliable data support for the effective development of shale gas reservoirs. By respectively setting a connection structure with a first connection hole 18 and a second connection hole 25 on the lower fixed plate 12 and the upper fixed plate 14 , and by using the first and second pressure springs 28 and the corresponding limiting blocks, limiting grooves and through holes 30, the lower simulated rock layer 13 and the upper simulated rock layer 15 are quickly installed and disassembled with the lower fixed plate 12 and the upper fixed plate 14 respectively, so that different lower simulated rock layers 13 and upper simulated rock layers 15 can be easily replaced according to the use requirements, thereby effectively broadening the collection range of experimental data and providing a richer and more accurate empirical basis for in-depth analysis of the conductivity performance of the proppant 16 in the fracture. Through the coordinated use of the upper fixed plate 14, the through hole 30, the moving block 31, the slide groove 32, the slider 33, the fixed rod 34 and the third pressure spring 35, by simply pushing the moving block 31 to make it slide smoothly in the through hole 30, the slide groove 32 and the slider The precise cooperation of 33 effectively enhances the stability of movement, thereby driving the second limiting block 29 to move accurately into the second limiting groove 27, thereby realizing a stable and convenient disassembly operation of the upper simulated rock layer 15, thereby not only ensuring the firmness of the upper simulated rock layer 15 during installation, but also greatly improving its convenience when it needs to be replaced. It is firmly installed on the top of the diversion chamber 3 through the fixing frame 36, and a plurality of hydraulic telescopic cylinders 37 are used to apply precise and controllable pressure to the upper fixing plate 14 to simulate the formation pressure conditions. At the same time, the outer walls of the fluid output pipe 6 and the fluid injection pipe 5 are wrapped with an insulation layer 38, which effectively reduces heat loss and ensures the stability of the fluid temperature. A three-way valve 39 is configured at one end of the fluid output pipe 6, which is not only convenient for introducing the fluid into the liquid collection tank 40 for collection and analysis , and vacuum treatment can be achieved by connecting the vacuum pump 41, which can prevent the air in the guide chamber 3 from affecting the experimental results. The heating tube 42 and the cooling tube 53 are respectively wound around the outer wall of the temperature regulating container 9 to achieve precise control of the temperature in the container. The first water pump 43 connected to one end of the heating tube 42 circulates the hot water in the heating tank 44 to the heating tube 42, and the electric heating rod 45 at the bottom of the heating tank 44 ensures that the hot water continues to maintain the required temperature. At the same time, the second water pump 46 connected to one end of the cooling tube 53 circulates the coolant in the cooling tank 47 to the cooling tube 53. The cooling tank 47 accelerates the cooling process through the cooling plate 52 and the fan 49 in the refrigerator shell 48 on one side, thereby providing an ideal temperature control environment for the solution in the container.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A shale gas reservoir proppant fracture conductivity testing device, comprising a conductivity testing device and a data acquisition module (1), characterized in that: The data acquisition module (1) is used to collect pressure data, flow data and temperature data during the test of the diversion test device, and send the collected data to the processor module (2) for analysis and processing; The diversion test device comprises a diversion chamber (3), a pressure applying device (4) is installed on the top of the diversion chamber (3), a fluid injection pipe (5) is installed through one end of the diversion chamber (3), a fluid output pipe (6) is installed on the other end of the diversion chamber (3), flow sensors (7) are installed on the ends of the fluid injection pipe (5) and the fluid output pipe (6) close to the diversion chamber (3), an input pump (8) is installed on the other end of the fluid injection pipe (5), the input end of the input pump (8) is connected to a temperature regulating container (9) through a pipeline, a temperature sensor (10) is embedded and installed on the inner wall of the temperature regulating container (9), the top of the outer wall of the temperature regulating container (9) is connected to a third water pump (54) through a pipeline, and an oil tank (11) is installed on the input end of the third water pump (54); The inner bottom wall of the flow guide chamber (3) is movably connected to a lower fixed plate (12), the top of the lower fixed plate (12) is movably connected to a lower simulated rock layer (13), the output end of the pressure applying device (4) is fixedly connected to an upper fixed plate (14), the bottom of the upper fixed plate (14) is movably connected to an upper simulated rock layer (15), a proppant (16) is filled between the lower simulated rock layer (13) and the upper simulated rock layer (15), and pressure sensors (17) are embedded in the middle and edge positions of the proppant (16) layer between the lower simulated rock layer (13) and the upper simulated rock layer (15).

2. The shale gas reservoir proppant fracture conductivity testing device according to claim 1, characterized in that: A plurality of first connection holes (18) are provided on the top edge of the lower fixing plate (12); the inner wall of the first connection hole (18) is movably connected to a first connection block (19); the top of the first connection block (19) is installed on the bottom of the lower simulated rock layer (13); the outer wall of the first connection block (19) is provided with a group of first limiting grooves (20); a first pressure spring (21) is installed inside the first limiting groove (20); one end of the first pressure spring (21) is movably connected to a first limiting block (22); the rear end of the outer wall of the first limiting block (22) is movably connected to the inner wall of the first limiting groove (20); the front end of the outer wall of the first limiting block (22) is movably connected to the inner wall of the limiting hole (23); and the limiting hole (23) is provided on the inner wall of the first connection hole (18).

3. The shale gas reservoir proppant fracture conductivity testing device according to claim 1, characterized in that: A plurality of second connection holes (25) are provided at the bottom edge of the upper fixed plate (14); the inner wall of the second connection hole (25) is movably connected to a second connection block (26); the bottom of the second connection block (26) is mounted on the top of the upper simulated rock layer (15); a second limiting groove (27) is provided on one side of the outer wall of the second connection block (26); a second pressure spring (28) is mounted inside the second limiting groove (27); one end of the second pressure spring (28) is movably connected to a second limiting block (29); the tail end of the outer wall of the second limiting block (29) is movably connected to the inner wall of the second limiting groove (27); the front end of the outer wall of the second limiting block (29) is movably connected to the inner wall of the through hole (30); one end of the through hole (30) is provided on the inner wall of the second connection hole (25); and the other end of the through hole (30) is provided on the outer wall of the upper fixed plate (14).

4. The shale gas reservoir proppant fracture conductivity testing device according to claim 3, characterized in that: The inner wall of the through hole (30) is movably connected to a moving block (31), the inner wall of the through hole (30) is provided with a group of slide grooves (32), the inner wall of the slide groove (32) is movably connected to a slider (33), and one end of the slider (33) is mounted on the outer wall of the moving block (31), the inner wall of the slide groove (32) is mounted with a fixing rod (34), and the outer wall of the fixing rod (34) passes through one end of the slider (33), the outer wall of the fixing rod (34) is movably connected to a third pressure spring (35), and one end of the third pressure spring (35) is movably connected to one end of the slider (33).

5. The shale gas reservoir proppant fracture conductivity testing device according to claim 1, characterized in that: The pressure applying device (4) comprises a fixing frame (36), and the fixing frame (36) is installed on the top of the guide chamber (3), a plurality of hydraulic telescopic cylinders (37) are installed on the top of the fixing frame (36), and the output ends of the hydraulic telescopic cylinders (37) are installed on the top of the upper fixing plate (14).

6. The shale gas reservoir proppant fracture conductivity testing device according to claim 1, characterized in that: The outer walls of the fluid output pipe (6) and the fluid injection pipe (5) are both wrapped with a thermal insulation layer (38), one end of the fluid output pipe (6) is installed with a three-way valve (39), a first output end of the three-way valve (39) is installed with a liquid collection tank (40), and a second output end of the three-way valve (39) is installed with a vacuum pump (41).

7. The shale gas reservoir proppant fracture conductivity testing device according to claim 1, characterized in that: The outer wall of the temperature regulating container (9) is respectively wound with a heating tube (42) and a cooling tube (53), one end of the heating tube (42) is installed with a first water pump (43), the input end of the first water pump (43) is connected to a heating tank (44) via a pipeline, and the top of the outer wall of the heating tank (44) is installed on the other end of the heating tube (42), and a plurality of electric heating rods (45) are embedded and installed at the bottom of the heating tank (44).

8. The shale gas reservoir proppant fracture conductivity testing device according to claim 7, characterized in that: A second water pump (46) is installed at one end of the refrigeration pipe (53), the input end of the second water pump (46) is connected to a refrigeration tank (47) through a pipeline, and the top of the outer wall of the refrigeration tank (47) is installed on the other end of the refrigeration pipe (53), a refrigerator shell (48) is installed on one side of the refrigeration tank (47), a refrigeration plate (52) is installed on one side of the inner wall of the refrigerator shell (48), and one side of the refrigeration plate (52) is installed in contact with the outer wall of the refrigeration tank (47), a fan (49) is installed in the middle of the inner wall of the refrigerator shell (48), a plurality of vents (50) are opened on the outer wall of the refrigerator shell (48), and a protective net (51) is installed on the other side of the refrigerator shell (48).

9. The method for using the shale gas reservoir proppant fracture conductivity testing device according to claim 4, characterized in that: The working steps of the shale gas reservoir proppant fracture conductivity testing device are as follows: S1, the upper simulated rock layer (15) is installed on the bottom of the upper fixed plate (14) through the second connecting block (26) and the second connecting hole (25), the pressure applying device (4) is driven to press the upper simulated rock layer (15), and the proppant (16) is filled between the lower simulated rock layer (13) and the upper simulated rock layer (15), and the pressure sensor (17) is embedded in the middle and edge positions of the proppant (16) layer; S2, starting the third water pump (54) to transport the oil from the oil tank (11) to the temperature adjustment container (9) for temperature adjustment, and obtaining temperature data in real time through the temperature sensor (10); after the temperature reaches the standard, starting the input pump (8) to inject the temperature-adjusted oil into the guide chamber (3) through the fluid injection pipe (5); S3, starting the pressure applying device (4) again, applying gradually increasing pressure to the upper simulated rock layer (15), simulating the pressure conditions of the underground reservoir, and collecting and recording the reading of the pressure sensor (17) in real time through the data acquisition module (1) to monitor the pressure distribution at different positions in the proppant (16) layer; S4. After passing through the proppant (16) layer, the oil is discharged through the fluid output pipe (6). At the same time, the data acquisition module (1) continues to collect and record the reading of the flow sensor (7) near the fluid output pipe (6), as well as the data of the temperature sensor (10) and the pressure sensor (17).

10. The method for using the shale gas reservoir proppant fracture conductivity testing device according to claim 9, characterized in that: The step S2 also includes the following steps: S21. Observe and record the reading of the flow sensor (7) to monitor the flow rate of the injected fluid.

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