Shale reservoir multiphase fluid permeability testing apparatus and method

Abstract

A shale reservoir multiphase fluid permeability testing apparatus and method. The apparatus comprises: a testing box (100); a core holder (500); a clamping mechanism (200), comprising a first clamping structure (2) and a second clamping structure (5), wherein the core holder (500) can be clamped and fixed from an input end and an output end of the core holder (500); a fluid pumping mechanism (300), comprising a gas pumping device (13) and a liquid pumping device (15), wherein the gas pumping device (13) is communicated with an inner cavity of the testing box (100), an input end of a liquid delivery pipe (7) extends out of the testing box (100) and is connected to the liquid pumping device (15), and an output end of the liquid delivery pipe (7) is located on a clamping surface of the first clamping structure (2) and is communicated with the input end of the core holder (500); a measurement mechanism, comprising a humidity sensor (9) and a plurality of multi-element sensing structures (3), wherein the plurality of multi-element sensing structures (3) are mounted in the testing box (100), and the humidity sensor (9) is mounted on a clamping surface of the second clamping structure (5); and a data processing mechanism.

Description

Shale reservoir multiphase fluid permeability testing device and method

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311724088.7 filed on December 14, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present disclosure relates to the technical field of shale oil and gas development, and in particular, to a device and method for testing the permeability of multiphase fluid in a shale reservoir. Background Art

[0004] As a key area for the exploration and development of unconventional oil and gas resources, the scale-effective development of shale oil and gas is an important revolution in the energy field. China is rich in shale oil and gas resources and has very broad development prospects. It has gradually become an important pillar for increasing oil and gas reserves and production. Shale reservoirs have complex compositions. In addition to clay minerals, they also contain many detrital minerals and authigenic minerals, with lamellae or lamellar stratification. Compared with conventional reservoirs, shale reservoirs are difficult to test or monitor the flow characteristics of fluids in shale when multiphase fluids are present due to factors such as their dense reservoirs and complex pore throat structures. Therefore, a shale reservoir multiphase fluid permeability test device and its use method are designed to obtain the flow characteristics of multiphase fluids in shale, providing guidance for production process design and improving oil and gas recovery rates.

[0005] Currently, there are numerous conventional permeability testing devices and methods, but they are generally single-phase, primarily monitoring pressure and flow rate and calculating using Darcy's equation. Due to the extremely low porosity and permeability of shale, which makes liquid flow difficult, existing monitoring and measurement methods and equipment are limited, making it difficult to conduct multiphase permeability testing of oil, gas, and water in shale. However, the permeability test results of multiphase fluids are more useful in practical applications. Summary of the Invention

[0006] The purpose of the present disclosure is to provide a shale reservoir multiphase fluid permeability testing device and its use method to solve the technical problems that the current permeability testing device has a limited scope of application and is unable to perform oil, gas and water multiphase flow permeability testing, making it difficult to realize the permeability of multiphase fluids in shale.

[0007] The above-mentioned objectives of the present disclosure can be achieved by adopting the following technical solutions:

[0008] The embodiment of the present disclosure provides a shale reservoir multiphase fluid permeability testing device, comprising: a test box, which is provided with a heating structure and a pressure regulator; a core clamp for clamping and fixing a core in a sealed cavity, the core clamp having an input end and an output end arranged opposite to each other and connected to the sealed cavity; a clamping mechanism, comprising a first clamping structure and a second clamping structure, the first clamping structure and the second clamping structure being capable of clamping and fixing the core clamp from the input end and the output end of the core clamp; a fluid pumping mechanism, comprising a gas pump and a liquid pump, the gas pump being connected to the inner cavity of the test box, the first clamping structure and the liquid pump being connected to the inner cavity of the test box, A liquid delivery pipe is passed through the structure, the input end of the liquid delivery pipe extends out of the test box and is connected to the liquid pump, and the output end of the liquid delivery pipe is located on the clamping surface of the first clamping structure and is connected to the input end of the core clamp; the detection mechanism includes a humidity sensor and multiple multi-sensor structures, multiple multi-sensor structures are installed in the test box, the multi-sensor structures include a mass sensor, a pressure sensor, an ultrasonic sensor and a temperature sensor, and the humidity sensor is installed on the clamping surface of the second clamping structure; a data processing mechanism is electrically connected to the humidity sensor and the multi-sensor structure.

[0009] In an embodiment of the present disclosure, the first clamping structure includes a first clamping telescopic member, a first clamping plate, a first mounting plate and a plurality of first connecting rods, wherein the first clamping plate is connected to the first mounting plate via the plurality of first connecting rods, one end of the first clamping telescopic member is fixed within the test box, and the other end of the first clamping telescopic member is connected to the first mounting plate; wherein the first clamping plate is provided with a first mounting hole, and the input end of the liquid delivery pipe extends from the spacing space between the first clamping plate and the first mounting plate into the first mounting hole and is connected to the input end of the core clamp.

[0010] In an embodiment of the present disclosure, the second clamping structure includes a second clamping telescopic member, a second clamping plate, a second mounting plate and a plurality of second connecting rods, the second clamping plate is connected to the second mounting plate through the plurality of second connecting rods, two ends of the second clamping telescopic member are fixed in the test box, and the other two ends of the second clamping telescopic member are connected to the second mounting plate; wherein, the second clamping plate is provided with a second mounting hole, the detection end of the humidity sensor extends into the second mounting hole, and the communication end of the humidity sensor extends into the spacing space between the second clamping plate and the second mounting plate.

[0011] In an embodiment of the present disclosure, the clamping mechanism also includes an adjusting structure and two third clamping structures, and the two third clamping structures can clamp and fix the core clamp from opposite sides of the core clamp; the two third clamping structures each include two third clamping telescopic parts arranged along the axial direction of the core clamp, and one end of each third clamping telescopic part of the two third clamping structures is provided with a third clamping plate, and the other end of each third clamping telescopic part of the two third clamping structures is connected to the adjusting structure, and the adjusting structure can drive the two third clamping telescopic parts of the third clamping structure to be relatively close to or away from the axial direction of the core clamp.

[0012] The two gears are connected with each other at two ends by the two gears, and the two gears are connected with each other at two ends by the two gears, and the two gears are connected with each other at two ends by the two gears.

[0013] 4. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt, and a nut. The bosses comprise a through-hole, a screw bolt, and a nut.

[0014] In an embodiment of the present disclosure, the shale reservoir multiphase fluid permeability testing device also includes a display mechanism, which is electrically connected to the data processing mechanism. The display mechanism is installed above the test box through a screen adjustment mechanism, and the screen adjustment mechanism can drive the display mechanism to rise and fall and rotate to adjust the height and angle of the display mechanism.

[0015] In an embodiment of the present disclosure, the screen adjustment mechanism includes a lifting frame, a mounting frame, a lifting drive structure and a rotating structure. The two opposite ends of the display mechanism in the vertical direction are installed in the lifting frame through a rotating structure. The mounting frame is installed above the test box. The lifting frame is slidably arranged on the mounting frame in the vertical direction. The lifting drive structure is installed on the mounting frame and is connected to the lifting frame.

[0016] In an embodiment of the present disclosure, the lifting drive mechanism is located above the lifting frame, and the lifting drive mechanism includes a retracting and discharging motor, a driving sprocket, a driven sprocket, a transmission chain, two retracting and discharging shafts and two retracting and discharging ropes. The retracting and discharging motor is installed on the mounting frame, the driving sprocket is installed on the output shaft of the retracting and discharging motor, the driven sprocket is rotatably mounted on the mounting frame and is connected to the driving sprocket through the transmission chain, the driving sprocket and the driven sprocket are respectively connected to one of the retracting and discharging shafts, one end of the two retracting and discharging ropes are correspondingly connected to the two retracting and discharging shafts and can be correspondingly retracted on the two retracting and discharging shafts, and the other end of the two retracting and discharging ropes is connected to the lifting frame.

[0017] In an embodiment of the present disclosure, the rotating structure includes two rotating plates, which are installed at the top and bottom ends of the display mechanism so that the display mechanism can be rotatably arranged around a vertical axis. Both rotating plates are arranged with multiple rotating columns along their rotation direction, and the lifting frame is provided with two rotating grooves for accommodating the multiple rotating columns on the two rotating plates, and a rolling track for accommodating multiple supporting balls is provided between the rotating plate and the lifting frame along the rotation direction of the rotating plate.

[0018] The present disclosure also provides a method for testing the permeability of multiphase fluid in a shale reservoir, which utilizes the above-mentioned permeability testing device for multiphase fluid in a shale reservoir. The method comprises the following steps: placing a core: placing a shale core in the core holder; placing the core holder in the test box and clamping and securing the core holder using the clamping structure; testing: heating the test box to a reservoir temperature using the heating structure and pressurizing the test box to a reservoir pressure using the pressure regulator; pumping supercritical carbon dioxide into the test box using the gas pumper and pumping fracturing fluid into the core holder using the liquid pumper; releasing the pressure, transmitting detection information from the humidity sensor of the detection mechanism and the multi-element sensing structure to the data processing mechanism; the data processing mechanism generating flow information of the multiphase fluid in the core based on the detection information; removing the core: cooling and depressurizing the test box; removing the core holder from the test box; and removing the core from the core holder.

[0019] In an embodiment of the present disclosure, the testing step further includes: the data processing mechanism transmits the detection information and the flow information to a display mechanism in real time for display; wherein the height and angle of the display mechanism are adjusted by a screen adjustment mechanism.

[0020] The features and advantages of the embodiments of the present disclosure are:

[0021] The shale reservoir multiphase fluid permeability testing device and method of the disclosed embodiment clamps and fixes the core holder to the test box from the input and output ends of the core holder through the first clamping structure and the second clamping structure of the clamping mechanism, and is suitable for clamping and fixing core holders of different sizes. Then, by providing a liquid delivery pipe on the first clamping structure and a humidity sensor on the second clamping structure, a liquid phase (such as fracturing fluid) is pumped into the core holder through a liquid pump, and a gas phase (such as supercritical carbon dioxide) is pumped into the test box through a gas pump, so that the supercritical carbon dioxide in the test box penetrates into the core from the input end of the core holder. After the multiphase fluid in the core penetrates from the output end of the core holder, a data processing mechanism can analyze and process the flow information of the multiphase fluid in the core based on the detection information of the humidity sensor and multiple multi-element sensing structures, and analyze the permeability of the multiphase fluid in the core. Therefore, the disclosed embodiment can monitor the permeability of the multiphase fluid in the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] FIG1 is a perspective view of a shale reservoir multiphase fluid permeability testing device according to an embodiment of the present disclosure;

[0024] FIG2 is a partial cross-sectional view of a shale reservoir multiphase fluid permeability testing device according to an embodiment of the present disclosure;

[0025] FIG3 is a disassembled diagram of the first clamping structure and the second clamping structure in an embodiment of the present disclosure;

[0026] FIG4 is a schematic structural diagram of an adjustment structure in one embodiment of the present disclosure;

[0027] FIG5 is a schematic diagram of the installation of an adjustment structure in another embodiment of the present disclosure;

[0028] FIG6 is a schematic structural diagram of an adjustment structure in another embodiment of the present disclosure;

[0029] Figure 7 is an enlarged view of point A in Figure 1;

[0030] FIG8 is a schematic structural diagram of a rotating structure in an embodiment of the present disclosure;

[0031] FIG9 is a schematic structural diagram of the lifting drive structure in an embodiment of the present disclosure.

[0032] Reference numerals:

[0033] 100, test chamber; 200, clamping mechanism; 300, fluid pumping mechanism; 400, screen adjustment mechanism; 500, core clamp; 600, display mechanism; 1, support base; 2, first clamping structure; 3, multi-sensor structure; 4, heating structure; 5, second clamping structure; 6, first clamping plate; 7, liquid delivery pipe; 8, second clamping plate; 9, humidity sensor; 10, third clamping structure; 11, reinforcement plate; 12, side plate; 13, gas pump; 14, pressure regulator; 15, liquid pump; 16, gas delivery pipe; 17, pressure regulating pipe; 18, mounting housing; 19, dual-axis motor; 20, output shaft; 21, driving gear; 22, driven gear; 23, bidirectional screw ; 24. Moving plate; 25. Limiting rod; 26. Third clamping telescopic member; 27. Third clamping plate; 28. Sliding plate; 29. ​​First positioning column; 30. First connecting plate; 31. Second positioning column; 32. Second connecting plate; 33. Adjusting telescopic member; 34. First connecting rod; 35. Second mounting plate; 36. Second clamping telescopic member; 37. Rotating plate; 38. Rotating column; 39. Supporting ball; 40. Supporting column; 41. Retractable shell; 42. Retractable motor; 43. Driving sprocket; 44. Transmission chain; 45. Driven sprocket; 46. Retracting shaft; 47. Retracting rope; 48. Lifting sliding plate; 49. First clamping telescopic member; 50. First mounting plate; 51. Second connecting rod; 52. Rotating groove. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0035] Implementation Method 1

[0036] As shown in Figures 1 and 2, an embodiment of the present disclosure provides a shale reservoir multiphase fluid permeability testing device, comprising: a test box 100, which is provided with a heating structure 4 and a pressure regulator 14; a core clamp 500, which is used to clamp and fix the core in a sealed cavity, and the core clamp 500 has an input end and an output end that are relatively arranged and connected to the sealed cavity; a clamping mechanism 200, which includes a first clamping structure 2 and a second clamping structure 5, and the first clamping structure 2 and the second clamping structure 5 can clamp and fix the core clamp 500 from the input end and the output end of the core clamp 500; a fluid pumping mechanism 300, which includes a gas pump 13 and a liquid pump 15, and the gas pump 13 is connected to the test box. The inner cavity of the test box 100 is connected, and a liquid delivery pipe 7 is passed through the first clamping structure 2. The input end of the liquid delivery pipe 7 extends out of the test box 100 and is connected to the liquid pump 15. The output end of the liquid delivery pipe 7 is located on the clamping surface of the first clamping structure 2 and is connected to the input end of the core clamp 500; the detection mechanism includes a humidity sensor 9 and a plurality of multi-sensor structures 3. The plurality of multi-sensor structures 3 are installed in the test box 100. The multi-sensor structures 3 include a mass sensor, a pressure sensor, an ultrasonic sensor and a temperature sensor. The humidity sensor 9 is installed on the clamping surface of the second clamping structure 5; the data processing mechanism is electrically connected to the humidity sensor 9 and the multi-sensor structure 3.

[0037] Among them, the liquid pump 15 pumps the liquid (such as fracturing fluid) directly into the input end of the core holder 500 through the liquid delivery pipe 7 and penetrates into the core, and the gas pump 13 pumps the gas (such as supercritical carbon dioxide) into the inner cavity of the test box 100, and then the gas in the test box 100 can penetrate into the internal core from the input end of the core holder 500; when the output end of the core holder 500 is opened and the pressure is released, the multiphase fluid in the core can seep out from the output end of the core holder 500, and then be detected by the humidity sensor 9 and the multi-sensor structure 3.

[0038] Among them, the humidity information of the output end of the core clamp 500 can be monitored by the humidity sensor 9 to determine whether liquid is leaking from the output end of the core clamp 500; the temperature sensor of the multi-sensing structure 3 can detect the temperature change in the test box 100; the mass sensor, pressure sensor, and ultrasonic sensor of the multi-sensing structure 3 respectively detect the mass change, pressure change, and sound wave change before and after the fluid, so as to distinguish the distribution volume of different fluids, and then use the fluid mechanics model of the existing technology to calculate the flow rate of different fluids.

[0039] The shale reservoir multiphase fluid permeability testing device of the embodiment of the present disclosure clamps and fixes the core holder 500 to the test box 100 from the input end and the output end of the core holder 500 through the first clamping structure 2 and the second clamping structure 5 of the clamping mechanism 200, and is suitable for clamping and fixing core holders 500 of different sizes. Furthermore, by arranging a liquid delivery pipe 7 on the first clamping structure 2 and a humidity sensor 9 on the second clamping structure 5, a liquid phase (such as fracturing fluid) is pumped into the core holder 500 through the liquid pump 15. In addition, The gas pump 13 can pump a gas phase (such as supercritical carbon dioxide) into the test chamber, causing the supercritical carbon dioxide in the test chamber 100 to penetrate the core from the input end of the core holder 500. After the multiphase fluid in the core seeps out from the output end of the core holder 500 into the test chamber 100, the data processing mechanism can analyze and process the flow rate information of the multiphase fluid in the core based on the detection information of the multi-sensor structure 3 installed in the test chamber 100 and the humidity sensor 9 on the second clamping structure 5, and analyze the permeability of the multiphase fluid in the core. Therefore, the disclosed embodiment can monitor the permeability of the multiphase fluid in the core.

[0040] Specifically, the test chamber 100, pressure regulator 14, and the gas pump 13 and liquid pump 15 of the fluid pumping mechanism 300 are all fixed to a support base 1. A flow meter is provided on the liquid delivery pipe 7, so that the volume of liquid pumped into the core can be determined based on the flow rate and the time it takes for the liquid pump 15 to pump the liquid. The gas pump 13 is connected to the test chamber 100 via a gas delivery pipe 16. The heating structure 4 can include two layers of heating wires, and the clamping mechanism 200 clamps the core clamp 500 between the two layers of heating wires. The pressure regulator 14 is generally an injection pump structure, connected to the test chamber 100 via a pressure regulating pipe 17, and is used to inject pressure-regulated gas (such as nitrogen) into the test chamber 100 to simulate reservoir pressure conditions. The core can be generally cylindrical. The core holder 500 can adopt the core holder of the existing technology, which has a sealed core chamber for accommodating the core. The input end and the output end of the core holder 500 are the two opposite ends in the axial direction of the core holder 500, which are connected to the sealed core chamber. The infiltration fluid can only flow into the core from the input end of the core holder 500 and then seep out from the output end of the core holder 500.

[0041] As shown in Figures 2 and 3, in the embodiment of the present disclosure, the first clamping structure 2 includes a first retractable clamping member 49, a first clamping plate 6, a first mounting plate 50, and a plurality of first connecting rods 34. The first clamping plate 6 is connected to the first mounting plate 50 via the plurality of first connecting rods 34. One end of the first retractable clamping member 49 is fixed within the test chamber 100, and the other end of the first retractable clamping member 49 is connected to the first mounting plate 50. The first clamping plate 6 is provided with a first mounting hole, and the input end of the liquid delivery tube 7 extends into the first mounting hole through the space between the first clamping plate 6 and the first mounting plate 50 and communicates with the input end of the core holder 500. The first retractable clamping member 49 extends axially along the core holder 500, thereby driving the synchronous movement of the first clamping plate 6. This allows the spacing between the first clamping plate 6 and the second clamping structure 5 to clamp and secure core holders 500 of varying axial lengths, while ensuring communication between the liquid delivery tube 7 and the input end of the core holder 500. Specifically, the output end of the liquid delivery pipe 7 is sealedly connected to the first mounting hole. The liquid delivery pipe 7 is a flexible pipe structure that can adapt to the movement of the first clamping plate 6 .

[0042] As shown in Figures 2 and 3, the second clamping structure 5 includes a second clamping telescopic member 36, a second clamping plate 8, a second mounting plate 35 and a plurality of second connecting rods 51. The second clamping plate 8 is connected to the second mounting plate 35 through a plurality of second connecting rods 51. Two ends of the second clamping telescopic member 36 are fixed in the test box 100, and the other two ends of the second clamping telescopic member 36 are connected to the second mounting plate 35. The second clamping plate 8 is provided with a second mounting hole, and the detection end of the humidity sensor 9 extends into the second mounting hole, and the communication end of the humidity sensor 9 extends into the spacing space between the second clamping plate 8 and the second mounting plate 35. By the second clamping telescopic member 36 extending and retracting along the axial direction of the core clamp 500, the second clamping plate 8 is driven to move synchronously, further improving the adjustment range of the spacing between the first clamping plate 6 and the second clamping plate 8, so that it can be used to clamp and fix more core clamps 500 with different axial lengths, and the permeating fluid in the core can be detected. In addition, the humidity sensor 9 installed on the second clamping plate 8 can promptly detect the permeating fluid seeping from the output end of the core clamp 500.

[0043] As shown in Figure 2, in the embodiment of the present disclosure, the clamping mechanism 200 also includes an adjusting structure and two third clamping structures 10, and the two third clamping structures 10 can clamp and fix the core clamp 500 from opposite sides; the two third clamping structures 10 both include two third clamping telescopic parts 26 arranged along the axial direction of the core clamp 500, and one end of each third clamping telescopic part 26 of the two third clamping structures 10 is provided with a third clamping plate 27, and the other end of each third clamping telescopic part 26 of the two third clamping structures 10 is connected to the adjusting structure, and the adjusting structure can drive the two third clamping telescopic parts 26 of the third clamping structure 10 to be relatively close to or away from the axial direction of the core clamp 500. By providing two third clamping structures 10 to clamp the core clamp 500 from opposite sides, the stability of the core clamp 500 can be further improved. In addition, by providing an adjustment structure to adjust the distance between the two third clamping telescopic members 26 in each third clamping structure 10, the clamping position of each third clamping plate 27 can be adjusted to adapt to core clamps 500 of different axial lengths.

[0044] As shown in Figures 2 and 4, in one embodiment of the present disclosure, the adjustment structure includes a dual-axis motor 19, two driving gears 21, two driven gears 22, two bidirectional screws 23 and two clamping installation structures. The two driving gears 21 are installed on the two output shafts 20 of the dual-axis motor 19, and the two ends of the two bidirectional screws are rotatably connected to the box body. One end of the two bidirectional screws is installed with two driven gears 22 and extends from the test box body 100. The two driven gears 22 are meshed with the two driving gears 21; the two third clamping structures 10 and the two clamping installation structures are installed on the two output shafts 20 of the dual-axis motor 19. The two ends of the two bidirectional screws are rotatably connected to the box body, and the two ends of the two bidirectional screws are installed with two driven gears 22 and extend from the test box body 100. The two driven gears 22 are meshed with the two driving gears 21; the two third clamping structures 10 and the two clamping installation structures are installed on the two output shafts 20 of the dual-axis motor 19. The mounting structure and the two bidirectional lead screws are arranged in a one-to-one correspondence. The clamping mounting structure includes two movable plates 24 and two limit rods 25. The two limit rods 25 are fixed in the test box 100 along the axial direction of the core clamp 500 and are symmetrically arranged on both sides of the bidirectional lead screw 23. The two movable plates 24 are threadedly engaged with the two threaded sections of the bidirectional lead screw 23 with opposite spirals and slide with the two limit rods 25 along the axial direction of the core clamp 500. The two third clamping telescopic members 26 of the third clamping structure 10 are connected to the two movable plates 24 in a one-to-one correspondence.

[0045] By rotating the two output shafts 20 of the dual-axis motor 19, the two bidirectional lead screws are driven to rotate by the meshing transmission between the two driving gears 21 and the two driven gears 22. Under the limiting action of the limiting rod 25, the movable plate 24 can convert the rotation of the bidirectional lead screw into a linear motion of the movable plate 24, so that the two output shafts 20 of the dual-axis motor 19 rotate in one direction (for example, clockwise), and each bidirectional lead screw also rotates in one direction (for example, clockwise), and the two movable plates 24 on each bidirectional lead screw move in a relative direction (for example, a relatively close direction) on the bidirectional lead screw; the two output shafts 20 of the dual-axis motor 19 rotate in another opposite direction (for example, counterclockwise), and each bidirectional lead screw also rotates in another opposite direction (for example, counterclockwise), and the two movable plates 24 on each bidirectional lead screw move in another opposite relative direction (for example, a relatively far away direction) on the bidirectional lead screw; thereby realizing the synchronous adjustment of the clamping positions of the two third clamping structures 10.

[0046] Specifically, the two ends of the bidirectional screw rod 23 can be rotatably connected to the two axially opposing walls of the test box 100 via bearings. A mounting housing 18 can be provided on the outside of one side wall for mounting a dual-axis motor 19, two driving gears 21, and two driven gears 22. The two third clamping structures 10 are located above and below the core holder 500. The two output shafts 20 of the dual-axis motor 19 are arranged in a vertical direction, and the driving gear 21 and the driven gear 22 are two meshing bevel gears.

[0047] As shown in Figures 2, 5 and 6, in another embodiment of the present disclosure, the adjustment structure includes two adjustment components, and the two adjustment components are arranged in a one-to-one correspondence with the two third clamping structures 10. The adjustment component includes two adjustment telescopic members 33, two connecting plates, two sliding plates 28, two first positioning columns 29 and two second positioning columns 31; the two adjustment telescopic members 33 are relatively arranged in the axial direction of the core clamp 500 and can be relatively close to or away from the axial direction of the core clamp 500; the two first positioning columns 29 and the two second positioning columns 31 are arranged along the axial direction of the core clamp 500. They are arranged axially in parallel, and the two first positioning columns 29 are located between the two second positioning columns 31. One end of the two first positioning columns 29 is slidably matched with the two second positioning columns 31 along the axial direction of the core clamp 500 through a sliding plate 28, and the other end of the two first positioning columns 29 is connected to an adjusting telescopic member 33 through a connecting plate. One end of the two second positioning columns 31 is slidably matched with the two first positioning columns 29 along the axial direction of the core clamp 500 through another sliding plate 28, and the other end of the two second positioning columns 31 is connected to another adjusting telescopic member 33 through another connecting plate.

[0048] By relatively extending the two adjusting telescopic members 33 in the axial direction of the core clamp 500, the first connecting plate 30 and the second connecting plate 32 can be driven to move closer to each other, so that the two sliding plates 28 also move closer to each other synchronously; by relatively shortening the two adjusting telescopic members 33 in the axial direction of the core clamp 500, the first connecting plate 30 and the second connecting plate 32 can be driven to move away from each other, so that the two sliding plates 28 also move away from each other synchronously; thereby, the two third clamping telescopic members 26 of a third clamping structure 10 can be moved closer to or farther away from each other. Therefore, by providing two adjusting assemblies, the clamping position of the two third clamping structures 10 can be adjusted. Specifically, the two adjusting assemblies are located above and below the core clamp 500. The adjusting telescopic member 33 can be an electric push rod.

[0049] In yet another embodiment of the present disclosure, the adjustment structure is a combination of the adjustment structures in the above two embodiments.

[0050] As shown in Figures 1 and 2, in an embodiment of the present disclosure, the shale reservoir multiphase fluid permeability testing device further includes a display mechanism 600. The display mechanism 600 is electrically connected to the data processing mechanism. The display mechanism 600 is mounted above the test box 100 via a screen adjustment mechanism 400. The screen adjustment mechanism 400 can drive the display mechanism 600 to rise and fall and rotate to adjust the height and angle of the display mechanism 600. The data processing mechanism can directly transmit the detection information collected by the detection mechanism to the display mechanism 600 for display, and can also transmit the results of the analysis and processing based on the detection information to the display mechanism 600 for display, so that the tester can understand the test situation. By providing the screen adjustment mechanism 400, the height of the display mechanism 600 can be adjusted according to the needs of the tester, for example, according to the height of the tester, and the angle of the display mechanism 600 can also be adjusted as needed. For example, according to the tester's standing position, the screen adjustment mechanism 400 can drive the display mechanism 600 to rotate around a vertical axis to adjust the angle of the display mechanism 600, so that the tester can observe the display mechanism 600 more comfortably and conveniently.

[0051] As shown in Figure 2, in an embodiment of the present disclosure, the screen adjustment mechanism 400 includes a lifting frame, a mounting frame, a lifting drive structure, and a rotating structure. The vertically opposing ends of the display mechanism 600 are mounted within the lifting frame via the rotating structure. The mounting frame is mounted above the test chamber 100, and the lifting frame slides vertically on the mounting frame. The lifting drive structure is mounted on the mounting frame and connected to the lifting frame. The lifting drive structure drives the lifting frame to rise and fall, thereby synchronously raising and lowering the display mechanism 600 without affecting the rotation of the display mechanism 600 by the rotating structure to adjust the angle of the display mechanism 600. Specifically, the mounting frame includes two support columns 40 vertically supported on the test chamber 100. The lifting frame includes two horizontally arranged reinforcement plates 11 and two vertically arranged side plates 12 connected to the ends of the two reinforcement plates 11. The side plates 12 slide in engagement with the two support columns 40 via two sliding plates 28. The display mechanism 600 is connected to at least one reinforcement plate 11 via the rotating structure.

[0052] As shown in Figures 2, 7, and 8, the rotating structure includes two rotating plates 37 mounted on the top and bottom of the display mechanism 600, enabling the display mechanism 600 to rotate about a vertical axis. Multiple rotating posts 38 are arranged on each rotating plate 37 along its rotational direction. The lifting frame is provided with two rotating grooves 52 for accommodating the multiple rotating posts 38 on the rotating plates 37. Furthermore, a rolling path for accommodating multiple supporting balls 39 is provided between the rotating plates 37 and the lifting frame along the rotational direction of the rotating plates 37. Specifically, the two rotating grooves 52 are provided on the inner side surfaces of the two reinforcing plates 11 and mate with the rotating posts 38 on the rotating plates 37. The hemispherical grooves on the rotating plates 37 and the hemispherical grooves on the inner side surfaces of the reinforcing plates 11 form a rolling path, thereby reducing friction when the rotating plates 37 rotate relative to the reinforcing plates 11. The rotating grooves 52 are annular, and the multiple rotating posts 38 move along the annular grooves as the rotating plates 37 rotate.

[0053] As shown in Figures 2 and 9, in one embodiment of the present disclosure, the lifting drive mechanism is located above the lifting frame, and the lifting drive mechanism includes a retracting and releasing motor 42, a driving sprocket 43, a driven sprocket 45, a transmission chain 44, two retracting and releasing shafts 46 and two retracting and releasing ropes 47. The retracting and releasing motor 42 is installed on the mounting frame, the driving sprocket 43 is installed on the output shaft 20 of the upper retracting and releasing motor 42, the driven sprocket 45 is rotatably installed on the mounting frame and is connected to the driving sprocket 43 through the transmission chain 44, the driving sprocket 43 and the driven sprocket 45 are respectively connected to a retracting and releasing shaft 46, one end of the two retracting and releasing ropes 47 are correspondingly connected to the two retracting and releasing shafts 46 and can be correspondingly retracted on the two retracting and releasing shafts 46, and the other end of the two retracting and releasing ropes 47 is connected to the lifting frame. Rotation of the output shaft 20 of the retractable motor 42 drives the driving sprocket 43 to rotate synchronously, which in turn drives the driven sprocket 45 to rotate synchronously via the transmission chain. This causes the two retractable shafts 46 to rotate synchronously under the drive sprocket 43 and the driven sprocket 45. This allows the two retractable ropes 47 to be synchronously wound around the two retractable shafts 46, thereby driving the lifting frame to rise, or to be synchronously released by the two retractable ropes 47, thereby driving the lifting frame to descend, thereby causing the lifting frame to raise or lower the display mechanism 600. Specifically, the driving sprocket 43 and the driven sprocket 45 have the same diameter and are located at the same horizontal height. A retractable housing 41 is mounted at the top of the two support columns 40. The retractable motor 42, the driving sprocket 43, the driven sprocket 45, the transmission chain 44, and the two retractable shafts 46 are all mounted within the retractable housing 41. The retractable motor 42 can be fixed to the inner wall of the retractable housing 41, and the driven sprocket 45 can be rotatably mounted on the inner wall of the retractable housing 41 via a bearing.

[0054] Implementation Method 2

[0055] As shown in Figures 1 and 2, the embodiment of the present disclosure also provides a shale reservoir multiphase fluid permeability testing method, which uses a shale reservoir multiphase fluid permeability testing device. The shale reservoir multiphase fluid permeability testing device in this embodiment has the same specific structure, working principle and beneficial effects as the shale reservoir multiphase fluid permeability testing device in Implementation Method 1. Therefore, the shale reservoir multiphase fluid permeability testing method in this embodiment can be implemented with reference to the shale reservoir multiphase fluid permeability testing device in Implementation Method 1, and will not be repeated here.

[0056] The method for testing the permeability of multiphase fluid in a shale reservoir according to an embodiment of the present disclosure comprises the following steps: placing a core: placing a shale core in a core holder 500; placing the core holder 500 in a test box 100 and clamping and fixing the core holder 500 using a clamping structure; testing: heating the test box 100 to a reservoir temperature using a heating structure 4, and pressurizing the test box 100 to a reservoir pressure using a pressure regulator 14; and injecting gas into the test box using a gas pump 13. Supercritical carbon dioxide is pumped into the test chamber 100, and fracturing fluid is pumped into the core holder 500 using the liquid pump 15; the pressure is released, and the detection information of the humidity sensor 9 and the multi-sensor structure 3 of the detection mechanism is transmitted to the data processing mechanism; the data processing mechanism generates flow information of the multiphase fluid in the core based on the detection information; the core is removed: the test chamber 100 is cooled and depressurized; the core holder 500 is removed from the test chamber 100; and the core is removed from the core holder 500.

[0057] Among them, supercritical carbon dioxide and fracturing fluid can be pumped in at the same time, or one of them can be pumped in first and the other later; as the fracturing fluid and supercritical carbon dioxide are continuously pumped into the core holder 500, the pressure inside the core continues to increase, and can then be stably maintained at a certain pressure; then, by releasing the pressure, that is, reducing the pressure at the output end of the core holder 500, the fluid inside the core seeps out from the output end of the core holder 500.

[0058] In the embodiment of the present disclosure, the test step further includes: the data processing mechanism transmits the detection information and flow information to the display mechanism 600 in real time for display; wherein, the height and angle of the display mechanism 600 are adjusted by the screen adjustment mechanism 400.

[0059] The above are only several embodiments of the present disclosure. Those skilled in the art may make various changes or modifications to the embodiments of the present disclosure based on the contents disclosed in the application documents without departing from the spirit and scope of the present disclosure.

Claims

1. A shale reservoir multiphase fluid permeability testing device, wherein: include: A test box body, wherein a heating structure is provided inside the test box body, and the test box body is connected to a pressure regulator; The clamping mechanism comprises a first clamping structure and a second clamping structure, wherein the first clamping structure and the second clamping structure can clamp and fix the core clamp in the test box from the input end and the output end of the core clamp; A fluid pumping mechanism, comprising a gas pumper and a liquid pumper, wherein the gas pumper is connected to the inner cavity of the test box, a liquid delivery pipe is provided on the first clamping structure, an input end of the liquid delivery pipe extends out of the test box and is connected to the liquid pumper, and an output end of the liquid delivery pipe is located on the clamping surface of the first clamping structure and is connected to the input end of the core clamp; A detection mechanism, comprising a humidity sensor and a plurality of multi-sensing structures, wherein the plurality of multi-sensing structures are installed in the test box, the multi-sensing structures include a mass sensor, a pressure sensor, an ultrasonic sensor and a temperature sensor, and the humidity sensor is installed on the clamping surface of the second clamping structure; The data processing mechanism is electrically connected to the humidity sensor and the multi-sensing structure.

2. The shale reservoir multiphase fluid permeability testing device according to claim 1, wherein: The first clamping structure includes a first clamping telescopic member, a first clamping plate, a first mounting plate and a plurality of first connecting rods, wherein the first clamping plate is connected to the first mounting plate via the plurality of first connecting rods, one end of the first clamping telescopic member is fixed in the test box, and the other end of the first clamping telescopic member is connected to the first mounting plate; wherein the first clamping plate is provided with a first mounting hole, and the input end of the liquid delivery pipe extends from the spacing space between the first clamping plate and the first mounting plate into the first mounting hole and is connected to the input end of the core clamp.

3. The shale reservoir multiphase fluid permeability testing device according to claim 2, wherein: The second clamping structure includes a second clamping telescopic member, a second clamping plate, a second mounting plate and a plurality of second connecting rods, the second clamping plate is connected to the second mounting plate via the plurality of second connecting rods, two ends of the second clamping telescopic member are fixed in the test box, and the other two ends of the second clamping telescopic member are connected to the second mounting plate; wherein the second clamping plate is provided with a second mounting hole, the detection end of the humidity sensor extends into the second mounting hole, and the communication end of the humidity sensor extends into the spacing space between the second clamping plate and the second mounting plate.

4. The shale reservoir multiphase fluid permeability testing device according to claim 1, wherein: The clamping mechanism also includes an adjusting structure and two third clamping structures, and the two third clamping structures can clamp and fix the core clamp from opposite sides of the core clamp; the two third clamping structures each include two third clamping telescopic parts arranged along the axial direction of the core clamp, and one end of each third clamping telescopic part of the two third clamping structures is provided with a third clamping plate, and the other end of each third clamping telescopic part of the two third clamping structures is connected to the adjusting structure, and the adjusting structure can drive the two third clamping telescopic parts of the third clamping structure to be relatively close to or away from the axial direction of the core clamp.

5. The shale reservoir multiphase fluid permeability testing device according to claim 4, wherein: The adjustment structure includes a double-axis motor, two driving gears, two driven gears, two bidirectional lead screws and two clamping installation structures, the two driving gears are installed on the two output shafts of the double-axis motor, the two ends of the two bidirectional lead screws are rotatably connected with the box body, and one end of the two bidirectional lead screws is installed with two driven gears and extends from the box body, and the two driven gears are meshed with the two driving gears; The two third clamping structures, the two clamping mounting structures and the two bidirectional lead screws are arranged in a one-to-one correspondence. The clamping mounting structure includes two movable plates and two limit rods. The two limit rods are fixed in the test box along the axial direction of the core clamp and are symmetrically arranged on both sides of the bidirectional lead screw. The two movable plates are threadedly matched with the two threaded sections of the bidirectional lead screw opposite to the spiral and slidably matched with the two limit rods along the axial direction of the core clamp. The two third clamping telescopic parts of the third clamping structure are connected to the two movable plates in a one-to-one correspondence.

6. The shale reservoir multiphase fluid permeability testing device according to claim 4, wherein: The adjustment structure includes two adjustment components, and the two adjustment components are arranged in a one-to-one correspondence with the two third clamping structures. The adjustment component includes two adjustment telescopic parts, two connecting plates, two sliding plates, two first positioning columns and two second positioning columns; the two adjustment telescopic parts are arranged opposite to each other in the axial direction of the core clamp and can be telescoped along the axial direction of the core clamp to be relatively close to or away from each other; The two first positioning columns and the two second positioning columns are arranged in parallel along the axial direction of the core clamp, and the two first positioning columns are located between the two second positioning columns, one end of the two first positioning columns is slidably matched with the two second positioning columns along the axial direction of the core clamp through a sliding plate, the other end of the two first positioning columns is connected to an adjusting telescopic member through a connecting plate, one end of the two second positioning columns is slidably matched with the two first positioning columns along the axial direction of the core clamp through another sliding plate, and the other end of the two second positioning columns is connected to another adjusting telescopic member through another connecting plate.

7. The shale reservoir multiphase fluid permeability testing device according to claim 1, wherein: The shale reservoir multiphase fluid permeability testing device also includes a display mechanism, which is electrically connected to the data processing mechanism. The display mechanism is installed above the test box through a screen adjustment mechanism. The screen adjustment mechanism can drive the display mechanism to rise and fall and rotate to adjust the height and angle of the display mechanism.

8. The shale reservoir multiphase fluid permeability testing device according to claim 7, wherein: The screen adjustment mechanism includes a lifting frame, a mounting frame, a lifting drive structure and a rotating structure. The two opposite ends of the display mechanism in the vertical direction are installed in the lifting frame through a rotating structure. The mounting frame is installed above the test box. The lifting frame is slidably arranged on the mounting frame in the vertical direction. The lifting drive structure is installed on the mounting frame and connected to the lifting frame.

9. The shale reservoir multiphase fluid permeability testing device according to claim 8, wherein: The lifting drive mechanism is located above the lifting frame, and the lifting drive mechanism includes a retracting and releasing motor, a driving sprocket, a driven sprocket, a transmission chain, two retracting and releasing shafts and two retracting and releasing ropes. The retracting and releasing motor is installed on the mounting frame, the driving sprocket is installed on the output shaft of the retracting and releasing motor, the driven sprocket is rotatably installed on the mounting frame and is connected to the driving sprocket through the transmission chain, the driving sprocket and the driven sprocket are respectively connected to one of the retracting and releasing shafts, one end of the two retracting and releasing ropes are correspondingly connected to the two retracting and releasing shafts and can be correspondingly retracted on the two retracting and releasing shafts, and the other end of the two retracting and releasing ropes is connected to the lifting frame.

10. The shale reservoir multiphase fluid permeability testing device according to claim 8, wherein: The rotating structure includes two rotating plates, which are installed at the top and bottom ends of the display mechanism so that the display mechanism can be rotatably arranged around a vertical axis. A plurality of rotating columns are arranged on the two rotating plates along their rotation direction. The lifting frame is provided with two rotating grooves for accommodating the plurality of rotating columns on the two rotating plates, and a rolling track for accommodating a plurality of supporting balls is provided between the rotating plate and the lifting frame along the rotation direction of the rotating plate.

11. A method for testing the permeability of multiphase fluid in shale reservoirs, wherein: Using the shale reservoir multiphase fluid permeability testing device according to any one of claims 1 to 10, the method comprises the following steps: Placing the core: placing the shale core into the core holder; placing the core holder in the test box and clamping and fixing the core holder using the clamping structure; Testing: using the heating structure to raise the temperature of the test box to the reservoir temperature, and using the pressure regulator to pressurize the test box to the reservoir pressure; using the gas pump to pump supercritical carbon dioxide into the test box, and using the liquid pump to pump fracturing fluid into the core holder; releasing the pressure, and transmitting the detection information of the humidity sensor of the detection mechanism and the multi-sensing structure to the data processing mechanism; the data processing mechanism generates the flow information of the multiphase fluid in the core according to the detection information; Taking out the core: cooling and decompressing the test box; taking out the core holder from the test box; and taking out the core from the core holder.

12. The shale reservoir multiphase fluid permeability testing method according to claim 11, wherein: The testing step also includes: the data processing mechanism transmits the detection information and the flow information to the display mechanism in real time for display; wherein the height and angle of the display mechanism are adjusted by the screen adjustment mechanism.

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