Experimental device for simulating volcanic rock oil and gas reservoir microcracks
By designing the coordination between the support seat and the components, the stable clamping of the core and the controllable expansion of the crack are achieved, the problem of core displacement damage is solved, the synchronous mixed flow simulation of gas, liquid and oil is realized, and the accuracy and repeatability of the experiment are improved.
Patent Information
- Application Number
- CN202510960438.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2025-10-14
AI Technical Summary
Existing experimental devices have poor stability when clamping and fixing core samples. The cores are easily displaced or damaged during high-pressure loading or fluid injection. It is also difficult to achieve synchronous mixed injection of gas, liquid and oil, affecting the repeatability and accuracy of the experiment.
An experimental device was designed, which included a support seat, a fluid injection assembly, an experimental assembly, a sealing assembly, a gas injection assembly, and a discharge assembly. The stable clamping of the core and the controllable expansion of the fracture were achieved through the cooperation of the electric push rod and the hydraulic rod. The synchronous mixed injection of gas, liquid, and oil was achieved through the cooperation of the fluid injection assembly and the gas injection assembly.
It improves the fixation stability of the core, controls the expansion range of the cracks, solves the problem of core displacement damage, and realizes the synchronous mixed flow simulation of gas, liquid and oil, which improves the accuracy and repeatability of the experiment.
Smart Images
Figure CN120778968A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil and gas, in particular to an experimental device for simulating micro-cracks in volcanic rock oil and gas reservoirs. Background Art
[0002] Volcanic oil and gas reservoirs are a special type of reservoir, whose storage space is typically composed of a combination of fractures and pores. Microcracks play a crucial role in the occurrence and migration of oil and gas. These fractures often have irregular shapes and complex mechanical properties, and are prone to deformation under conditions of high temperature and high pressure, affecting the permeability of the reservoir and the flow of oil and gas. Therefore, studying the microcrack characteristics of volcanic oil and gas reservoirs is of great significance for revealing the mechanisms of oil and gas migration and improving oil and gas recovery. However, such research requires high-precision experimental equipment to simulate the real reservoir environment, but existing technologies have many shortcomings, which restricts the in-depth development of related research.
[0003] Current experimental setups lack stability when clamping and securing core samples. Cores can shift or even become damaged during high-pressure loading or fluid injection. This is particularly true when simulating complex fracture propagation behavior. Insecure core fixation can make fracture morphology difficult to control, impacting experimental repeatability and accuracy. This issue is particularly acute in experiments simulating volcanic reservoirs, as volcanic rock samples have a complex physical structure and are susceptible to external interference.
[0004] Second, existing devices struggle to precisely inject and control multiphase fluids, particularly the simultaneous mixed injection of gas, liquid, and oil. This technical limitation prevents experiments from accurately simulating the co-flow of oil, gas, and water within reservoir fractures, neglecting the details of their interactions within microfractures. Summary of the Invention
[0005] In response to the shortcomings of the existing technology, the present invention provides an experimental device for simulating microcracks in volcanic oil and gas reservoirs, which solves the problem that the current experimental device has poor stability when clamping and fixing core samples, and the core may be displaced or even damaged during high-pressure loading or fluid injection.
[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an experimental device for simulating micro-cracks in volcanic rock oil and gas reservoirs, comprising: an experimental table, a support seat is fixed on the upper surface of the experimental table; a fluid injection assembly is arranged on the upper surface of the support seat and is used to inject liquid and oil into the interior of the device; an experimental assembly is arranged on the experimental table, the experimental assembly includes a shell, the lower surface of the shell is fixed to the upper surface of the experimental table, a collecting bucket is fixed inside the shell, a rock core is arranged inside the collecting bucket, a crack groove is opened inside the rock core, and the outer surface of the collecting bucket is provided with a rock core. A left-right symmetrical support frame is fixed to the wall, and a left-right symmetrical hinge block 1 is fixed to the outer wall of the support frame. An electric push rod 1 is rotated inside the hinge block 1, and a hinge block 2 is fixed to the output end of the electric push rod 1. A clamping plate is fixed to the outer wall of the hinge block 2, and the outer wall of the clamping plate fits the outer wall of the rock core; a sealing component is arranged on the outer shell for sealing the outer shell; a gas injection component is arranged on the experimental table for injecting gas into the interior of the outer shell; a discharge component is arranged on the lower surface of the experimental table for discharging waste liquid inside the collecting bucket.
[0007] Preferably, a rubber pad is fixed inside the clamping plate, a limit plate is fixed on the outer wall of the clamping plate, and the outer wall of the limit plate is in contact with the outer wall of the rock core.
[0008] Preferably, a support plate is fixed to the upper surface of the collecting hopper, a second electric push rod is fixed inside the support plate, a conical block is fixed to the driving end of the second electric push rod, and the outer wall of the conical block is arranged inside the crack groove.
[0009] Preferably, the fluid injection assembly includes a plurality of storage boxes, the lower surface of the storage box is fixed to the upper surface of the support seat, a delivery pump is fixed to the upper surface of the support seat, an extraction pipe is fixed to the input end of the delivery pump, the end of the extraction pipe is fixed to the inside of the storage box, a delivery pipe is fixed to the delivery end of the delivery pump, the outer wall of the delivery pipe is fixed to the inside of the outer shell, the end of the delivery pipe is fixed to the connecting end of the core, a one-way valve is provided inside the delivery pipe, and a feed pipe is fixed to the end of the storage box.
[0010] Preferably, the sealing assembly includes a hydraulic rod, a connecting plate is fixed to a driving end of the hydraulic rod, and a lower surface of the hydraulic rod is fixed to an upper surface of the housing.
[0011] Preferably, a bracket is fixed to the lower surface of the connecting plate, and a sealing plate is fixed to the lower surface of the bracket.
[0012] Preferably, the outer wall of the sealing plate slides inside the shell, and a transparent window is provided through the interior of the sealing plate.
[0013] Preferably, the gas injection assembly includes an air pump, the lower surface of the air pump is fixed to the upper surface of the experimental table, an air guide tube is fixed to the output end of the air pump, a diversion tube is fixed to the end of the air guide tube, a plurality of nozzles pass through the interior of the diversion tube, and the outer wall of the nozzle is arranged inside the outer shell.
[0014] Preferably, a pressure sensor is fixed on the upper surface of the collecting hopper, a display screen is fixed on the outer wall of the shell, the pressure sensor and the display screen are electrically connected, and a heating plate is provided inside the shell.
[0015] Preferably, the discharge assembly includes a water pump, a water pumping pipe is fixed to the input end of the water pump, one end of the water pumping pipe is fixed inside the collecting bucket, and a drain pipe is fixed to the output end of the water pump.
[0016] The present invention provides an experimental device for simulating microcracks in volcanic oil and gas reservoirs. It has the following beneficial effects:
[0017] 1. The present invention achieves the goal of clamping and fixing the core while facilitating replacement and controlling the expansion range of cracks through the coordination between the internal structure of the experimental assembly and the hydraulic rod and the conical block. This solves the problems of insufficient experimental accuracy caused by loose core fixation and poor experimental repeatability caused by uncontrollable cracks in traditional experimental devices.
[0018] 2. The present invention achieves the goal of injecting gas, liquid and oil into the interior of the experimental component and adjusting the environment inside the shell through the cooperation between the fluid injection component and the gas injection component, which solves the limitation problem of the existing technology that it is difficult to simultaneously simulate the mixed flow characteristics of gas, liquid and oil.
[0019] 3. The present invention achieves the function of auxiliary experimental components through the cooperation between the sealing component and the discharge component, which makes it convenient to open the shell and discharge the wastewater generated by the experiment, solving the problems of insufficient sealing performance and complex waste liquid treatment in existing devices. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A perspective view of the present invention;
[0021] Figure 2 It is a schematic diagram of the experimental platform structure of the present invention;
[0022] Figure 3 Schematic diagram of the internal structure of the housing of the present invention;
[0023] Figure 4 It is a schematic diagram of the core structure of the present invention;
[0024] Figure 5 It is a schematic diagram of the structure of the clamping plate part of the present invention;
[0025] Figure 6 It is a schematic diagram of the structure of the conical block part of the present invention;
[0026] Figure 7 It is a schematic diagram of the structure of the sealing plate of the present invention;
[0027] Figure 8 It is a partial structural diagram of the water pump of the present invention.
[0028] Among them, 1. Experimental table; 2. Support base; 3. Fluid injection assembly; 301. Storage box; 302. Delivery pump; 303. Extraction pipe; 304. Delivery pipe; 305. Feed pipe; 306. One-way valve; 4. Experimental assembly; 401. Housing; 402. Collection bucket; 403. Core; 404. Fracture groove; 405. Support frame; 406. Articulated block 1; 407. Electric push rod 1; 408. Articulated block 2; 409. Clamping plate; 410. Limit plate; 411 , rubber pad; 5. Sealing assembly; 501. Bracket; 502. Hydraulic rod; 503. Connecting plate; 504. Sealing plate; 505. Transparent window; 6. Gas injection assembly; 601. Air pump; 602. Air guide tube; 603. Diverter tube; 604. Nozzle; 7. Discharge assembly; 701. Water pump; 702. Suction pipe; 703. Drain pipe; 8. Support plate; 9. Electric push rod 2; 10. Conical block; 11. Pressure sensor; 12. Display screen; 13. Heating plate. DETAILED DESCRIPTION
[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. 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 making creative efforts are within the scope of protection of the present invention.
[0030] Please see the attached Figure 1 -Attached Figure 6The embodiment of the present invention provides an experimental device for simulating micro-cracks in volcanic oil and gas reservoirs, comprising: an experimental table 1, a support base 2 being fixed on the upper surface of the support base 2; a fluid injection assembly 3 being arranged on the upper surface of the support base 2 and used for injecting liquid and oil into the interior of the device; an experimental assembly 4 being arranged on the experimental table 1, the experimental assembly 4 comprising an outer shell 401, the lower surface of the outer shell 401 being fixed to the upper surface of the experimental table 1, a collecting bucket 402 being fixed inside the outer shell 401, a rock core 403 being arranged inside the collecting bucket 402, a crack 404 being opened inside the rock core 403, a left-right symmetrical support frame 405 being fixed to the outer wall of the collecting bucket 402, a left-right symmetrical hinge block 406 being fixed to the outer wall of each support frame 405, an electric push rod 407 being rotated inside the hinge block 406, and an hinge block 407 being fixed to the output end of the electric push rod 407 2 408, the outer wall of the hinged block 2 408 is fixed with a clamping plate 409, and the outer wall of the clamping plate 409 is in contact with the outer wall of the core 403; the sealing component 5 is arranged on the outer shell 401, and is used to seal the outer shell 401; the gas injection component 6 is arranged on the experimental table 1, and is used to inject gas into the interior of the outer shell 401; the discharge component 7 is arranged on the lower surface of the experimental table 1, and is used to discharge the waste liquid inside the collecting bucket 402, the inside of the clamping plate 409 is fixed with a rubber pad 411, the outer wall of the clamping plate 409 is fixed with a limiting plate 410, and the outer wall of the limiting plate 410 is in contact with the outer wall of the core 403, the upper surface of the collecting bucket 402 is fixed with a support plate 8, the inside of the support plate 8 is fixed with an electric push rod 2 9, the driving end of the electric push rod 2 9 is fixed with a conical block 10, and the outer wall of the conical block 10 is arranged inside the crack 404.
[0031] Specifically, the rock core 403 set inside the collecting bucket 402 is the core of the experiment. By opening a groove 404 inside the rock core 403, the morphology and distribution characteristics of micro-cracks are simulated. The support frame 405 enhances the stability of the rock core 403 during the experiment through a symmetrical structural design. The electric push rod 1 407 installed on the support frame 405 drives the hinge block 2 408 through the output force, so that the clamping plate 409 stably clamps the outer wall of the rock core 403. A rubber pad 411 is attached to the inside of the clamping plate 409 to prevent direct damage to the surface of the rock core 403 and provide a certain buffering effect. The limit plate 410 can limit the position of the rock core 403 to prevent the rock core 403 from slipping or offsetting due to excessive fluid pressure or loading force. The driving end of the electric push rod 2 9 cooperates with the conical block 10. When the conical block 10 is inserted into the groove 404, the simulation and dynamic adjustment of the crack expansion are realized.
[0032] Please see the attached Figure 3 -Attached Figure 8The fluid injection assembly 3 includes a plurality of storage boxes 301, the lower surface of the storage box 301 is fixed to the upper surface of the support seat 2, the upper surface of the support seat 2 is fixed with a delivery pump 302, the input end of the delivery pump 302 is fixed with an extraction pipe 303, the end of the extraction pipe 303 is fixed to the inside of the storage box 301, the delivery end of the delivery pump 302 is fixed with a delivery pipe 304, the outer wall of the delivery pipe 304 is fixed to the inside of the shell 401, the end of the delivery pipe 304 is fixed to the connecting end of the core 403, a one-way valve 306 is provided inside the delivery pipe 304, and a feed pipe 305 is fixed to the end of the storage box 301. The sealing assembly 5 includes a hydraulic rod 502, the driving end of the hydraulic rod 502 is fixed with a connecting plate 503, the lower surface of the hydraulic rod 502 is fixed to the upper surface of the shell 401, the lower surface of the connecting plate 503 is fixed with a bracket 501, and the lower surface of the bracket 501 is fixed with a sealing plate 504. The outer wall of the plate 504 slides inside the shell 401, and a transparent window 505 is opened through the inside of the sealing plate 504. The gas injection component 6 includes an air pump 601, and the lower surface of the air pump 601 is fixed to the upper surface of the experimental table 1. The output end of the air pump 601 is fixed with an air guide tube 602, and the end of the air guide tube 602 is fixed with a diversion tube 603. The inside of the diversion tube 603 is penetrated by multiple nozzles 604, and the outer wall of the nozzle 604 is arranged inside the shell 401. A pressure sensor 11 is fixed on the upper surface of the collecting bucket 402, and a display screen 12 is fixed on the outer wall of the shell 401. The pressure sensor 11 and the display screen 12 are electrically connected. A heating plate 13 is arranged inside the shell 401. The discharge component 7 includes a water pump 701, and a water pumping pipe 702 is fixed to the input end of the water pump 701. One end of the water pumping pipe 702 is fixed to the inside of the collecting bucket 402, and a drain pipe 703 is fixed to the output end of the water pump 701.
[0033] Specifically, the delivery pump 302 accurately delivers the fluid, the extraction tube 303 extracts the fluid from the storage box 301, and the delivery pump 302 pushes the fluid to the delivery tube 304 to achieve continuous supply of the fluid. The one-way valve 306 set inside the delivery tube 304 ensures that the fluid flows in one direction, thereby avoiding the problem of pressure instability caused by fluid backflow. The feed tube 305 facilitates timely replenishment of the liquid in the storage box 301 to ensure the continuity of the experimental process. The sealing assembly 5 drives the connecting plate 503 through the hydraulic rod 502, so that the bracket 501 drives the sealing plate 50 4 pairs of shells 401 are dynamically sealed, and a transparent window 505 provided on the sealing plate 504 facilitates direct observation of the internal conditions during the experiment. The gas injection assembly 6 provides a stable gas source through the air pump 601, and the gas guide pipe 602 transports the gas to the diversion pipe 603. The diversion pipe 603 evenly distributes the gas through multiple nozzles 604, thereby achieving sufficient mixing of the gas inside the shell 401 and further improving the simulation effect of the oil, gas and water multiphase flow. The heating plate 13 can provide a stable temperature control environment to ensure that the experimental conditions are close to the high temperature state of the real reservoir.
[0034] Working principle: The experimental table 1 provides stable support for the entire device, and the storage tank 301 stores liquid or oil. The delivery pump 302 extracts fluid from the storage tank 301 through the extraction pipe 303 and delivers the fluid to the connection end of the core 403 through the delivery pipe 304. At the same time, the one-way valve 306 ensures that the fluid flows in one direction and avoids backflow. The feed pipe 305 is used to replenish the liquid in the storage tank 301. The core 403 is provided with a crack 404 to simulate the micro-crack environment. At the same time, the support frame 405 is The collecting bucket 402 provides stable support, the hinge block 1 406 is connected to the support frame 405 and rotates to drive the electric push rod 1 407. The output end of the electric push rod 1 407 drives the hinge block 2 408 to move and clamps the core 403 through the clamping plate 409. The inner side of the clamping plate 409 is equipped with a rubber pad 411 to protect the surface of the core 403, and the stability of the clamping is ensured by the limit plate 410. The top of the experimental component 4 is provided with a support plate 8, which fixes the electric push rod 2 9. The driving end of the second 9 is connected to the conical block 10, which is inserted into the crack 404 of the core 403 to control the expansion range of the crack. The hydraulic rod 502 drives the connecting plate 503 to move up and down. The connecting plate 503 fixes the sealing plate 504 through the bracket 501. The sealing plate 504 slides inside the housing 401 to achieve a sealing function. A transparent window 505 is provided on the sealing plate 504 to facilitate observation of the internal conditions. The air pump 601 is started, and gas is delivered to the diversion pipe 603 through the air guide pipe 602. Multiple nozzles 604 are distributed inside the diversion pipe 603. The nozzles 604 uniformly inject gas into the housing 401, thereby simulating the mixed flow of gas and liquid or oil. The waste liquid in the collection bucket 402 is discharged through the water pump 701 through the water pump 702 and discharged through the drain pipe 703. A heating plate 13 is provided inside the device to simulate the high temperature environment of the reservoir. At the same time, the pressure sensor 11 monitors the internal pressure and transmits the data to the display screen 12 on the housing 401 for intuitive display.
[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.
Claims
1. An experimental device for simulating microcracks in volcanic oil and gas reservoirs, characterized in that: include: A test bench (1), the upper surface of which is fixed with a support base (2); A fluid injection assembly (3) is arranged on the upper surface of the support seat (2) and is used to inject liquid and oil into the interior of the device; an experimental assembly (4) is arranged on the experimental table (1), and the experimental assembly (4) includes a shell (401), the lower surface of the shell (401) is fixed to the upper surface of the experimental table (1), a collecting bucket (402) is fixed inside the shell (401), a rock core (403) is arranged inside the collecting bucket (402), and a crack groove (404) is opened inside the rock core (403). ), the outer wall of the collecting bucket (402) is fixed with a left-right symmetrical support frame (405), the outer wall of the support frame (405) is fixed with a left-right symmetrical hinge block 1 (406), the interior of the hinge block 1 (406) is rotated with an electric push rod 1 (407), the output end of the electric push rod 1 (407) is fixed with a hinge block 2 (408), the outer wall of the hinge block 2 (408) is fixed with a clamping plate (409), and the outer wall of the clamping plate (409) is in contact with the outer wall of the core (403); A sealing assembly (5) is provided on the housing (401) and is used to seal the housing (401); A gas injection assembly (6), which is arranged on the experimental platform (1) and is used to inject gas into the interior of the housing (401); The discharge assembly (7) is arranged on the lower surface of the experimental table (1) and is used to discharge the waste liquid inside the collection bucket (402).
2. The experimental device for simulating microcracks in volcanic oil and gas reservoirs according to claim 1, characterized in that: A rubber pad (411) is fixed inside the clamping plate (409), and a limiting plate (410) is fixed on the outer wall of the clamping plate (409). The outer wall of the limiting plate (410) is in contact with the outer wall of the rock core (403).
3. The experimental device for simulating microcracks in volcanic oil and gas reservoirs according to claim 1, characterized in that: A support plate (8) is fixed on the upper surface of the collecting hopper (402), an electric push rod 2 (9) is fixed inside the support plate (8), a conical block (10) is fixed to the driving end of the electric push rod 2 (9), and the outer wall of the conical block (10) is arranged inside the crack groove (404).
4. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 1, characterized in that: The fluid injection assembly (3) comprises a plurality of storage boxes (301), the lower surface of the storage box (301) is fixed to the upper surface of the support seat (2), a delivery pump (302) is fixed to the upper surface of the support seat (2), an extraction pipe (303) is fixed to the input end of the delivery pump (302), the end of the extraction pipe (303) is fixed to the interior of the storage box (301), a delivery pipe (304) is fixed to the delivery end of the delivery pump (302), the outer wall of the delivery pipe (304) is fixed to the interior of the housing (401), the end of the delivery pipe (304) is fixed to the connection end of the core (403), a one-way valve (306) is provided inside the delivery pipe (304), and a feed pipe (305) is fixed to the end of the storage box (301).
5. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 4, characterized in that: The sealing assembly (5) comprises a hydraulic rod (502), a driving end of the hydraulic rod (502) is fixed with a connecting plate (503), and the lower surface of the hydraulic rod (502) is fixed to the upper surface of the housing (401).
6. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 5, characterized in that: A bracket (501) is fixed to the lower surface of the connecting plate (503), and a sealing plate (504) is fixed to the lower surface of the bracket (501).
7. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 6, characterized in that: The outer wall of the sealing plate (504) slides inside the housing (401), and a transparent window (505) is provided through the interior of the sealing plate (504).
8. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 1, characterized in that: The gas injection assembly (6) includes an air pump (601), the lower surface of the air pump (601) is fixed to the upper surface of the experimental table (1), an air guide tube (602) is fixed to the output end of the air pump (601), a diversion tube (603) is fixed to the end of the air guide tube (602), a plurality of nozzles (604) are passed through the interior of the diversion tube (603), and the outer wall of the nozzle (604) is arranged inside the shell (401).
9. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 1, characterized in that: A pressure sensor (11) is fixed on the upper surface of the collecting hopper (402), a display screen (12) is fixed on the outer wall of the housing (401), the pressure sensor (11) and the display screen (12) are electrically connected, and a heating plate (13) is provided inside the housing (401).
10. The experimental device for simulating micro-cracks in volcanic oil and gas reservoirs according to claim 1, characterized in that: The discharge assembly (7) comprises a water pump (701), a water pumping pipe (702) is fixed to the input end of the water pump (701), one end of the water pumping pipe (702) is fixed inside the collecting bucket (402), and a drainage pipe (703) is fixed to the output end of the water pump (701).