A testing device and testing method for a volume swelling plugging fluid

Abstract

The application belongs to the technical field of plugging technology in the petroleum and natural gas drilling industry, and particularly provides a body swelling plugging fluid testing device and a testing method, which comprises a pressure control device, a grouting device, a receiving device, an experimental bin, a heating device and a fixing device; solves the problems that the existing technology cannot realize real well bottom data simulation, cannot solve the problem that the plugging device is blocked after plugging is completed, the plugging device body is easily damaged when being cleaned, and the plugging instrument is scrapped, can truly simulate well bottom data, can be used once or multiple times, can be replaced if damaged or blocked, is simple to operate, has low cost, and thus has high practical value.

Description

Technical Field

[0001] This invention belongs to the field of plugging technology in the oil and gas drilling industry, specifically relating to a testing device and method for a bulk-expanding plugging fluid. Background Technology

[0002] With the comprehensive development of oil and gas fields, the technology for mining blocks with dense reservoirs and stable strata has matured. However, with the increase in oil and gas equivalent mining tasks, many unmined blocks and marginal exploration areas have entered the mining scope. Due to the complex geological structure of unknown blocks, drilling has become extremely difficult. In particular, the increased downhole complexity and non-productive time caused by well leakage has made plugging technology a key technical problem restricting drilling efficiency.

[0003] With the development of plugging technology, various plugging materials have been vigorously promoted. However, there is a lack of corresponding experimental and evaluation devices for various types of plugging materials, resulting in a lack of specificity and indoor data. Existing plugging technology and equipment have many drawbacks and shortcomings: 1. They cannot simulate real well bottom data and are mostly simple plunger plugging modes. 2. The plugging slurry injection process and plugging slurry sealing mechanism are all carried out in the sealing device, making it impossible to observe the plugging process. 3. The plugging time for gel and bulky materials cannot be observed visually, and the plugging mechanism of the plugging slurry entering the leaking layer and sealing the bottom layer cannot be described and analyzed, often resulting in useless and repetitive experiments.

[0004] After leak sealing is completed, a pressure test is often required on the leaking layer. Many devices cannot evaluate the pressure resistance of the sealed layer, nor can they visually observe the relationship between the pressure resistance of the sealing compound and time. Many leak sealing devices use integrated units: the temperature and pressure resistant body directly holds the sealing liquid. After sealing, the device is easily clogged, requiring manual labor and additional equipment to remove the hardened material, which can easily damage the device itself or even render the entire instrument unusable.

[0005] Chinese patent document CN204738806U, published on November 4, 2015, discloses a visual simulation of downhole plugging testing device. A base plate is fixed to a support, and a pressure-resistant transparent cylinder is fixed to the base plate. A cover plate covers the upper end of the pressure-resistant transparent cylinder. The upper and lower ends of the pressure-resistant transparent cylinder are sealed to the cover plate and the base plate respectively by sealing rings. The cover plate is connected to the outer edge of the bottom by long bolts. The base plate, cover plate, and pressure-resistant transparent cylinder are coaxial. A grouting pipe is connected to the cover plate, and a grouting valve is installed at the upper end of the grouting pipe. The inlet of the grouting valve is connected to a mud funnel. An air inlet pipe is also connected to the cover plate, and a pressure control valve is installed at the upper end of the air inlet pipe. The inlet of the pressure control valve is connected to an air supply pipeline. A grout discharge pipe is connected to the middle of the base plate, and a grout discharge valve is installed on the grout discharge pipe. A permeable plate is placed on the inner circumference of the lower part of the pressure-resistant transparent cylinder, with an inwardly protruding step. This device can simulate the entire leakage process with 360° visibility and can also test the pressure-bearing capacity of the rubber block after successful plugging. However, this literature cannot simulate real bottom-hole data, and it cannot solve the problem of the plugging device becoming clogged after plugging is completed, which can easily damage the plugging device body during cleaning and lead to the plugging instrument becoming unusable. Summary of the Invention

[0006] The purpose of the present invention is to provide a test device and test method for a bulky plugging fluid, which overcomes the problems in the prior art that cannot achieve simulation of real well bottom data, cannot solve the problem of the plugging device being blocked after plugging is completed, and is easily damaged when cleaning, resulting in the scrapping of the plugging instrument.

[0007] Therefore, this invention provides a testing device for a volumetric plugging fluid, comprising a pressure control device, a grouting device, a receiving device, a test chamber, a heating device, and a fixing device; the pressure control device includes an air inlet pipe, a pressure regulating valve, and an air source; the grouting device includes a grouting funnel, a grouting valve, and a grouting pipeline; the receiving device includes a connecting pipeline, a receiving valve, and a measuring instrument; the test chamber includes a pipe, a fixing ring, support legs, a rotating sleeve, an inner cylinder, an upper cover plate, and a venting plate; the fixing device includes a rotating wheel, a base plate, a support, and a crossbeam; the support includes an upper support, a frame plate, and a lower support, with the crossbeam, upper support, frame plate, lower support, base plate, and rotating wheel connected sequentially from top to bottom; the top of the frame plate is connected to a pipe located inside the upper support, and the top of the pipe is connected to an upper... The cover plate is connected to the crossbeam. The inner cylinder, vent plate, and support legs are connected sequentially from top to bottom inside the pipe. The upper end of the connecting pipe is connected to the middle of the vent plate, and the lower end of the connecting pipe passes through the frame plate. The lower part of the connecting pipe is connected to the receiving valve, which is located below the frame plate. The measuring device is connected to the top of the bottom plate and is located directly below the lower end of the connecting pipe. The lower part of the pipe is fitted with a rotating sleeve, and the frame plate is connected below the rotating sleeve. A fixing ring is connected between the inner cylinder and the pipe. A heating device is connected to the outside of the pipe. The air source is connected to the upper cover plate sequentially through the pressure regulating valve and the air inlet pipe. The upper end of the grouting pipe is connected to the grouting funnel, and the lower end of the grouting pipe passes through the upper cover plate and is located inside the inner cylinder. The grouting valve is connected to the pipe body of the grouting pipe above the upper cover plate.

[0008] Preferably, the tube is made of transparent and colorless material, the bottom plate is made of heavy material with a thickness of 3-5cm, the inner cylinder is made of lightweight and transparent material, and the vent plate and the legs are made of lightweight material.

[0009] Preferably, the heating device includes a heating jacket and a temperature control box, the heating jacket being connected to the outside of the tube and electrically connected to the temperature control box.

[0010] Preferably, the upper cover and the tube are sealed by a sealing ring.

[0011] Preferably, scale markings are provided on the outer walls of both the tube and the inner cylinder.

[0012] Preferably, the height of the liquid filling between the tube and the inner cylinder does not exceed 2 / 3 of the height of the inner cylinder.

[0013] Preferably, the grouting funnel, grouting valve, and grouting pipeline have the same central axis, and the central axis is a vertical central axis.

[0014] Preferably, a filter screen is provided at the bottom of the inner cylinder.

[0015] Preferably, the rotating wheel is a self-locking rotating wheel that can rotate 360°.

[0016] A test method for a bulky plugging fluid test device includes a plugging test and a plugging pressure test of the bulky plugging fluid;

[0017] The leak-sealing test of the bulk-expanding sealing fluid includes the following steps:

[0018] 1) Insert a simulated leak layer into the inner cylinder;

[0019] 2) Pour clean water between the pipe and the inner cylinder to the target height;

[0020] 3) Turn on the heating device to raise the temperature inside the tube to the first target temperature and maintain it;

[0021] 4) Open the grouting valve, and inject the bulk-expanding plugging fluid into the inner cylinder through the grouting funnel and grouting pipeline. Record the volume of the bulk-expanding plugging fluid in the inner cylinder and the corresponding scale.

[0022] 5) Turn on the gas source, adjust the inner cylinder pressure to the first experimental pressure through the pressure regulating valve and maintain it; the bulky plugging liquid enters the simulated leak layer under the drive of the first experimental pressure and reacts with the simulated leak layer. After the reaction stops, record the termination mark of the bulky plugging liquid.

[0023] 6) Turn off the gas and power supply, and evaluate the plugging effect of the bulky plugging fluid based on the data of the bulky plugging fluid recorded in steps 4) and 5).

[0024] The leak-sealing pressure test includes the following steps:

[0025] S1. After the leak-sealing test of the bulky plugging fluid is completed, turn on the heating device to raise the temperature inside the pipe to the second target temperature and maintain it.

[0026] S2. Open the grouting valve, and the drilling fluid is injected into the inner cylinder through the grouting funnel and grouting pipeline. Then close the grouting valve.

[0027] S3. Turn on the gas source and adjust the inner cylinder pressure to the second experimental pressure through the pressure regulating valve. Turn off the gas source and maintain it. Evaluate the plugging effect of the bulky plugging liquid based on the pressure drop of the inner cylinder and the intrusion volume of the bulky plugging liquid.

[0028] The beneficial effects of this invention are:

[0029] 1. The present invention provides a test device and method for a bulk-expanding plugging fluid; a pressure control device simulates well pressure; a grouting device selects the injection liquid according to the test content; when performing a plugging test of a bulk-expanding plugging fluid, the bulk-expanding plugging fluid is injected through the grouting device; when performing a plugging pressure test, drilling fluid is injected through the grouting device; a heating device can simulate the reaction process of the plugging material at different temperatures at the bottom of the well, and evaluate the temperature sensitivity of the plugging material; it can realistically simulate bottom-of-well data.

[0030] 2. The expansion-type sealing fluid testing device and method provided by this invention adopts an inner and outer cylinder design (with an inner cylinder connected to the inner tube), which is economical and practical. Traditional sealing devices use a direct experimental method, where the sealing material and sand bed are directly placed on the glass fiber tube. The glass fiber tube is easily blocked and damaged during a single test, resulting in high costs and poor economic practicality. The inner cylinder of this application is made of a lightweight and transparent material that is heat-resistant, economical, and low-cost. It can be used once or multiple times, and can be replaced if damaged or blocked. It is simple to operate and low-cost, thus having high practical value.

[0031] 3. The expansion plugging liquid testing device and testing method provided by the present invention have a 360° rotatable and movable self-locking wheel installed on the bottom plate. The wheel has a self-locking function to ensure the stability of the experimental device during the experiment. The movable wheel installed on the bottom plate ensures both the stability of the equipment and its easy and convenient movement. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] Figure 1 This is the main structural view of the body expansion plugging fluid testing device;

[0034] Figure 2 This is a structural diagram of the tube and inner cylinder;

[0035] Figure 3 This is a schematic diagram of the heating device.

[0036] Explanation of reference numerals in the attached drawings: 1. Rotary wheel; 2. Base plate; 3. Bracket; 4. Bolt; 5. Pressure regulating valve; 6. Air inlet pipe; 7. Top cover plate; 8. Crossbeam; 9. Grouting funnel; 10. Grouting valve; 11. Grouting pipeline; 12. Pipe; 13. Fixing ring; 14. Heating jacket; 15. Support leg; 16. Connecting pipeline; 17. Receiving valve; 18. Measuring instrument; 19. Rotating sleeve; 20. Inner cylinder; 21. Ventilation plate; 22. Temperature control box; 23. Air source; 3-1. Upper bracket; 3-2. Frame plate; 3-3. Lower bracket. Detailed Implementation

[0037] Example 1:

[0038] like Figure 1 - Figure 3As shown, a test device for a volumetric expansion plugging fluid includes a pressure control device, a grouting device, a receiving device, a test chamber, a heating device, and a fixing device. The pressure control device includes an air inlet pipe 6, a pressure regulating valve 5, and an air source 23. The grouting device includes a grouting funnel 9, a grouting valve 10, and a grouting pipeline 11. The receiving device includes a connecting pipeline 16, a receiving valve 17, and a measuring device 18. The test chamber includes a pipe 12, a fixing ring 13, a support leg 15, and a rotating sleeve 1. 9. Inner cylinder 20, upper cover plate 7, and ventilated plate 21. The fixing device includes a rotating wheel 1, a bottom plate 2, a bracket 3, and a crossbeam 8. The bracket 3 includes an upper bracket 3-1, a frame plate 3-2, and a lower bracket 3-3. The crossbeam 8, upper bracket 3-1, frame plate 3-2, lower bracket 3-3, bottom plate 2, and rotating wheel 1 are connected sequentially from top to bottom. The top of the frame plate 3-2 is connected to a pipe 12, and the pipe 12 is located inside the upper bracket 3-1. The top of the pipe 12 is connected to the upper cover plate 7, and the upper cover plate... 7. Connecting beam 8. The inner cylinder 20, vent plate 21, and support leg 15 are connected sequentially from top to bottom inside pipe 12. The upper end of connecting pipe 16 is connected to the middle of vent plate 21, and the lower end of connecting pipe 16 passes through frame plate 3-2. The lower part of connecting pipe 16 is connected to receiving valve 17, which is located below frame plate 3-2. Measuring device 18 is connected to the top of bottom plate 2 and is located directly below the lower end of connecting pipe 16. The lower part of pipe 12 is covered by an outer sleeve. A rotating sleeve 19 is connected to a frame plate 3-2 below the rotating sleeve 19. A fixing ring 13 is connected between the inner cylinder 20 and the pipe 12. A heating device is connected to the outside of the pipe 12. The air source 23 is connected to the upper cover plate 7 in sequence through the pressure regulating valve 5 and the air inlet pipe 6. The upper end of the grouting pipeline 11 is connected to the grouting funnel 9. The lower end of the grouting pipeline 11 passes through the upper cover plate 7 and is located inside the inner cylinder 20. A grouting valve 10 is connected to the pipe body of the grouting pipeline 11 above the upper cover plate 7.

[0039] This invention provides a testing device and method for a bulk-expanding plugging fluid. A pressure control device simulates well pressure, and a pressure regulating valve 5 controls the pressure in the pipe and inner cylinder, ensuring convenient pressure relief and high safety. The inner cylinder is connected to a receiving valve 17 via a connecting pipeline 16, which allows adjustment of the pressure channel to simulate leakage pressure. Both the internal and external pressures of the inner cylinder are provided by a gas source, ensuring consistent pressure and simulating the process of the plugging slurry being pushed under pressure. The grouting device selects the injection liquid based on the test requirements: for bulk-expanding plugging fluid testing, the slurry is injected; for pressure-bearing plugging testing, drilling fluid is injected. A heating device simulates the reaction process of the plugging material at different temperatures at the bottom of the well, allowing for evaluation of the material's temperature sensitivity. This method can realistically simulate bottom-well data. By adopting an inner and outer cylinder design (with inner cylinder 20 connected inside pipe 12), it is economical and practical. Traditional leak-sealing devices use a direct experimental method, where the leak-sealing material and sand bed are directly installed on the fiberglass tube. The fiberglass tube is easily blocked and damaged in one experiment, resulting in high cost and poor economic practicality. The inner cylinder 20 of this application is economical and practical, with low cost. It can be used once or multiple times. If it is damaged or blocked, it can be replaced. It is simple to operate and has low cost, thus having high practical value.

[0040] Example 2:

[0041] Based on Example 1, the tube 12 is made of transparent and colorless material, the bottom plate 2 is made of heavy material with a thickness of 3-5cm, the inner cylinder 20 is made of lightweight and transparent material, and the vent plate 21 and the support leg 15 are both made of lightweight material.

[0042] Pipe 12 is made of transparent and colorless material, and the inner cylinder 20 is made of lightweight and transparent material, allowing for visual observation of the process of the plugging slurry entering and sealing the formation. This accurately reflects the plugging mechanism of the slurry and allows for visual observation of whether the plugging fluid has reacted completely, thus determining whether the plugging operation is complete and avoiding blindly repeating experiments. The base plate 2 is made of 3-5cm thick heavy material, providing strong load-bearing capacity and good stability. The vent plate 21 and the support legs 15 are both made of lightweight materials, reducing the weight of the device.

[0043] Preferably, the tube 12 is an acrylic tube with an inner diameter of 8-12 cm and a thickness of 2-3 cm; it can withstand pressure up to 15 MPa and high temperature up to 100°C.

[0044] Preferably, the inner cylinder 20 has a wall thickness of 0.2-0.4cm and an inner diameter of 6-8cm; it can withstand high temperatures up to 100°C.

[0045] Preferably, the ventilated plate 21 has multiple round holes evenly distributed, and the diameter of the round holes is 2-4mm. The ventilated plate can bear rock fragments such as rock chips larger than 5mm, steel balls, or steel plate layers with fine cracks. It can simulate three types of leakage strata: holes, cavities, and cracks. The simulated leakage layer material is close to the lithology of the strata, and the simulated sealing effect is closer to the real sealing effect.

[0046] Preferably, the heating device includes a heating jacket 14 and a temperature control box 22. The heating jacket 14 is connected to the outside of the tube 12 and is electrically connected to the temperature control box 22.

[0047] The heating device of this structure has an adjustable range of 30-100℃, an adjustable heating rate range of 0.1-60℃, and a temperature control accuracy of ±0.1℃.

[0048] Preferably, the upper cover plate 7 and the tube 12 are sealed by a sealing ring. This improves the sealing performance of the device during testing and enhances testing accuracy.

[0049] Preferably, both the outer walls of the pipe 12 and the inner cylinder 20 are provided with graduation marks. The graduation marks allow for accurate observation of the volume expansion ratio of the plugging fluid within the simulated wellbore.

[0050] Preferably, the liquid level between the tube 12 and the inner cylinder 20 does not exceed 2 / 3 of the height of the inner cylinder 20.

[0051] While meeting testing requirements, ensure the safety of the operation process.

[0052] Preferably, the grouting funnel 9, the grouting valve 10, and the grouting pipeline 11 have the same central axis, and the central axis is a vertical central axis.

[0053] The central axis is a vertical central axis, which means that the vertical injection method is adopted to simulate the shape of the plugging slurry exiting the drilling tool and the drilling fluid entering the wellbore.

[0054] Preferably, a filter screen is provided at the bottom of the inner cylinder 20. This prevents the sealing liquid from clogging the connecting pipeline.

[0055] Preferably, the rotating wheel 1 is a self-locking rotating wheel that can rotate 360°.

[0056] The base plate is equipped with a 360° rotatable and movable self-locking wheel. This wheel has a self-locking function to ensure the stability of the experimental device during the experiment. The base plate is also equipped with movable wheels, which ensures both the stability of the equipment and its easy and convenient movement.

[0057] Preferably, the crossbeam 8 is connected to the bracket 3-1 by bolts 4. The bolt connection is a detachable connection, which is convenient for connection and disassembly.

[0058] Preferably, there are multiple fixing rings 13, which are evenly connected from top to bottom between the inner cylinder 20 and the pipe 12. This allows the inner cylinder 20 to be stably connected inside the pipe 12.

[0059] Preferably, the heating sleeve 14 includes heating elements and a locking buckle. The number of heating elements is two, and the two heating elements are connected by the locking buckle. In use, the heating elements are wrapped around the outside of the inner cylinder 20. It is convenient to use, has a high degree of fit, and has high heating efficiency.

[0060] Preferably, the diameter of the ventilated plate 21 is smaller than the diameter of the pipe 12, and the gap between the ventilated plate 21 and the pipe 12 is 5-8% of the diameter of the pipe 12. This maximizes the supporting function while improving the stability of the structure and facilitates installation and disassembly.

[0061] Preferably, the measuring device 18 is a graduated cylinder; graduated cylinders are economical and practical.

[0062] Example 3:

[0063] A test method for a bulky plugging fluid test device includes a plugging test and a plugging pressure test of the bulky plugging fluid;

[0064] The leak-sealing test of the bulk-expanding sealing fluid includes the following steps:

[0065] 1) Insert a simulated leak layer into the inner cylinder 20;

[0066] 2) Inject clean water between pipe 12 and inner cylinder 20 to the target height;

[0067] 3) Turn on the heating device to raise the temperature inside tube 12 to the first target temperature and maintain it;

[0068] 4) Open the grouting valve 10, and inject the bulk-expanding plugging fluid into the inner cylinder 20 through the grouting funnel 9 and the grouting pipeline 11. Record the volume of the bulk-expanding plugging fluid in the inner cylinder 20 and the corresponding scale.

[0069] 5) Turn on the gas source 23, adjust the pressure of the inner cylinder 20 to the first experimental pressure through the pressure regulating valve 5 and maintain it; the bulky plugging liquid enters the simulated leak layer under the drive of the first experimental pressure and reacts with the simulated leak layer. After the reaction stops, record the termination scale of the bulky plugging liquid.

[0070] 6) Turn off the gas and power supply, and evaluate the plugging effect of the bulky plugging fluid based on the data of the bulky plugging fluid recorded in steps 4) and 5).

[0071] The leak-sealing pressure test includes the following steps:

[0072] S1. After the leak-stopping test of the bulky plugging fluid is completed, turn on the heating device to raise the temperature inside the tube 12 to the second target temperature and maintain it.

[0073] S2. Open the grouting valve 10, and the drilling fluid is injected into the inner cylinder 20 through the grouting funnel 9 and the grouting pipeline 11. Then close the grouting valve 10.

[0074] S3. Open the air source 23, adjust the pressure of the inner cylinder 20 to the second experimental pressure through the pressure regulating valve 5, close the air source 23 and maintain it, and evaluate the plugging effect of the bulky plugging liquid based on the pressure drop of the inner cylinder 20 and the intrusion volume of the bulky plugging liquid.

[0075] This invention allows for visualizing the pressure-bearing capacity of the sealant block after sealing, enabling quantitative indoor evaluation of the sealing effect, which is beneficial for optimizing and improving the sealing formula.

[0076] Example 4:

[0077] Evaluation of the plugging effect of bulk-expanding plugging fluid under 60℃ / 6MPa conditions

[0078] The rotating wheel 1 of this device is locked and cannot be moved, ensuring that the experimental instrument is securely installed.

[0079] 1) A simulated leak layer is installed in the inner cylinder 20. The simulated leak layer is composed of quartz sand of 850-425um and pebbles of 2-3mm. The sand bed is moistened with water.

[0080] 2) Fill the space between pipe 12 and inner cylinder 20 with clean water up to 2 / 3 of the height of inner cylinder 20;

[0081] 3) Fix the crossbeam 8 and the upper cover plate 7 to the experimental device bracket 3 with bolts 4, and connect the pressure regulating valve 5 and the air inlet pipe 6 to the upper cover plate 7; open the temperature control box 22, set the temperature to 60℃, so that the temperature inside the tube 12 reaches 60℃, and keep the temperature within the error range.

[0082] 4) Open the grouting valve 10, and inject the bulk-expanding plugging fluid into the inner cylinder 20 through the grouting funnel 9 and the grouting pipeline 11. The volume of the bulk-expanding plugging fluid is V1. Close the grouting valve 10 and record the corresponding scale H1 of the bulk-expanding plugging fluid.

[0083] 5) Turn on the gas source 23, adjust the pressure of the inner cylinder 20 to 6MPa through the pressure regulating valve 5, and keep the pressure stable; observe and record the experimental data. The expansion plugging liquid enters the simulated leak layer under the pressure and reacts with the simulated leak layer. Visually observe whether the reaction has terminated, and record the scale H2 after the plugging liquid reaction has terminated.

[0084] 6) Turn off the gas supply and the power supply;

[0085] Calculate the volume after the reaction

[0086] The expansion factor of the swellable plugging fluid can be calculated by the volume difference ΔV before and after the reaction.

[0087] Example 5:

[0088] Leakage sealing pressure evaluation test (7MPa / 70℃):

[0089] 1) Following the experimental steps and conditions of Example 3, after the leak-sealing experiment was completed, a leak-sealing pressure-bearing evaluation test was conducted; the temperature control chamber 22 was opened and the temperature was raised to 70°C;

[0090] 3) Open the grouting valve 10 and inject 100mL of the prepared drilling fluid into the inner cylinder 20, then close the grouting valve again;

[0091] 4) Open the gas source 23 and adjust the pressure of the inner cylinder 20 to 7 MPa through the pressure regulating valve 5; close the gas source and ensure the initial pressure is 7 MPa. Observe the volume of drilling fluid entering the formation. By observing the pressure drop and the volume of the bulky plugging fluid entering the formation, evaluate the plugging effect of the bulky plugging fluid.

[0092] Application Example 4: On-site application of 60℃ to evaluate the swelling properties of the plugging fluid.

[0093] The well experienced a loss of return at a depth of 1762 meters. Multiple attempts to plug the leak with cement and bridge plugs proved ineffective. A plugging fluid with a volumetric expansion property evaluated in laboratory tests (60℃) was applied on-site.

[0094] The indoor evaluation showed that the expansion ratio of the expansion plugging fluid was 1.5 times and the compressive strength was greater than 4 MPa.

[0095]

[0096]

[0097] In the description of this invention, it should be understood that if terms such as "front," "inside," or "right" indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, it does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0098] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A device for testing bulky plugging fluid, characterized in that: The system includes a pressure control device, a grouting device, a receiving device, an experimental chamber, a heating device, and a fixing device. The pressure control device includes an air inlet pipe (6), a pressure regulating valve (5), and an air source (23). The grouting device includes a grouting funnel (9), a grouting valve (10), and a grouting pipeline (11). The receiving device includes a connecting pipeline (16), a receiving valve (17), and a measuring instrument (18). The experimental chamber includes a pipe (12), a fixing ring (13), a support leg (15), a rotating sleeve (19), an inner cylinder (20), an upper cover plate (7), and a ventilated plate (21). The fixing device includes… The components are: a rotating wheel (1), a base plate (2), a support (3), and a crossbeam (8); the support (3) includes an upper support (3-1), a frame plate (3-2), and a lower support (3-3). The crossbeam (8), the upper support (3-1), the frame plate (3-2), the lower support (3-3), the base plate (2), and the rotating wheel (1) are connected sequentially from top to bottom. The top of the frame plate (3-2) is connected to a pipe (12), and the pipe (12) is located inside the upper support (3-1). The top of the pipe (12) is connected to an upper cover plate (7), and the upper cover plate (7) is connected to the crossbeam (8). The interior of the pipe (12) is connected sequentially from top to bottom. The inner cylinder (20), the vent plate (21), and the support leg (15) are connected. The upper end of the connecting pipe (16) is connected to the middle of the vent plate (21), and the lower end of the connecting pipe (16) passes through the frame plate (3-2). The lower part of the connecting pipe (16) is connected to the receiving valve (17), and the receiving valve (17) is located below the frame plate (3-2). The measuring device (18) is connected to the top of the bottom plate (2), and the measuring device (18) is located directly below the lower end of the connecting pipe (16). The lower part of the pipe (12) is fitted with a rotating sleeve (19), and the rotating sleeve (19) is connected to the frame plate (3-2) below. A fixing ring (13) is connected between the inner cylinder (20) and the pipe (12). A heating device is connected to the outside of the pipe (12). The air source (23) is connected to the upper cover plate (7) through the pressure regulating valve (5) and the air inlet pipe (6) in sequence. The upper end of the grouting pipeline (11) is connected to the grouting funnel (9). The lower end of the grouting pipeline (11) passes through the upper cover plate (7) and the lower end of the grouting pipeline (11) is located inside the inner cylinder (20). The grouting valve (10) is connected to the pipe body of the grouting pipeline (11) above the upper cover plate (7). Multiple round holes are opened on the vent plate (21), and the multiple round holes are evenly distributed.

2. The body expansion plugging fluid testing device as described in claim 1, characterized in that: The tube (12) is made of transparent and colorless material, the bottom plate (2) is made of heavy material with a thickness of 3-5cm, the inner cylinder (20) is made of lightweight and transparent material, and the vent plate (21) and the support leg (15) are both made of lightweight material.

3. The body expansion plugging fluid testing device as described in claim 1, characterized in that: The heating device includes a heating jacket (14) and a temperature control box (22). The heating jacket (14) is connected to the outside of the tube (12), and the heating jacket (14) is electrically connected to the temperature control box (22).

4. The body expansion plugging fluid testing device as described in claim 1, characterized in that: The upper cover plate (7) and the tube (12) are sealed by a sealing ring.

5. The body expansion plugging fluid testing device as described in claim 1, characterized in that: Both the outer walls of the tube (12) and the inner cylinder (20) are marked with scale markings.

6. The body expansion plugging fluid testing device as described in claim 1, characterized in that: The height of the liquid filling between the tube (12) and the inner cylinder (20) shall not exceed 2 / 3 of the height of the inner cylinder (20).

7. The body expansion plugging fluid testing device as described in claim 1, characterized in that: The grouting funnel (9), grouting valve (10) and grouting pipeline (11) have the same central axis and the central axis is a vertical central axis.

8. The body expansion plugging fluid testing device as described in claim 1, characterized in that: A filter screen is provided at the bottom of the inner cylinder (20).

9. The body expansion plugging fluid testing device as described in claim 1, characterized in that: The rotating wheel (1) is a 360° rotatable self-locking rotating wheel.

10. A testing method for a volumetric plugging fluid testing device as described in any one of claims 1-9, characterized in that: This includes leak-sealing tests and leak-sealing pressure tests for bulk-expanding plugging fluids; The leak-sealing test of the bulk-expanding sealing fluid includes the following steps: 1) Insert a simulated leak layer into the inner cylinder (20); 2) Inject clean water between the pipe (12) and the inner cylinder (20) to the target height; 3) Turn on the heating device to raise the temperature inside the tube (12) to the first target temperature and maintain it; 4) Open the grouting valve (10), and inject the bulk-expanding plugging fluid into the inner cylinder (20) through the grouting funnel (9) and the grouting pipeline (11). Record the volume of the bulk-expanding plugging fluid in the inner cylinder (20) and the corresponding scale. 5) Turn on the gas source (23), adjust the pressure of the inner cylinder (20) to the first experimental pressure through the pressure regulating valve (5) and maintain it; the bulky plugging liquid enters the simulated leak layer under the drive of the first experimental pressure and reacts with the simulated leak layer. After the reaction is terminated, record the termination scale of the bulky plugging liquid. 6) Turn off the gas and power supply, and evaluate the plugging effect of the bulky plugging fluid based on the data of the bulky plugging fluid recorded in steps 4) and 5). The leak-sealing pressure test includes the following steps: S1. After the plugging test of the bulky plugging fluid is completed, turn on the heating device to raise the temperature inside the tube (12) to the second target temperature and maintain it. S2. Open the grouting valve (10), and the drilling fluid is injected into the inner cylinder (20) through the grouting funnel (9) and the grouting pipeline (11). Then close the grouting valve (10). S3. Turn on the gas source (23), adjust the pressure of the inner cylinder (20) to the second experimental pressure through the pressure regulating valve (5), turn off the gas source (23) and keep it, and evaluate the plugging effect of the bulky plugging liquid based on the pressure drop of the inner cylinder (20) and the volume of the bulky plugging liquid intrusion.

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