Well leakage simulation leaking stoppage device used for narrow-density window overflow leakage and leakage and well leakage simulation leaking stoppage device

Abstract

The invention relates to the technical field of oil field drilling engineering, and discloses a well leakage simulation plugging device for narrow-density window overflow leakage and leakage, which comprises a booster pump, a circulating cavity, a shaft, an annular pressure pump, a charging system, a core clamping system, a circulating system, an intelligent water and gas injection system and an intelligent filtrate analysis and measurement system, the feeding system comprises a plugging slurry tank I, a plugging slurry tank II and a stirrer; the rock core clamping system comprises an end face filtration clamp, a crack rock core and a pressure sensor II; the circulating system comprises a high-pressure circulating pump, a pneumatic three-way valve and a pressure sensor, the intelligent water and gas injection system comprises a water inlet, a gas inlet, a pressure regulating valve, a constant-flux pump and a flowmeter, and the intelligent filtrate analysis and measurement system comprises a piston container, a back-pressure valve, a balance, a buffer container and a manual pump. Due to the design of the double slurry systems, the flexibility of the experiment is improved, adjustment can be carried out according to the leaking stoppage effect, it is ensured that the experiment is closer to the actual working condition, and more comprehensive evaluation is provided for the material performance.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield drilling engineering, in particular to a leakage plugging device for simulating well leakage with leakage in a narrow density window. Background Art

[0002] With the continuous development of petroleum engineering technology, the challenges faced in drilling operations are increasing, especially the severity of the well leakage problem. Well leakage refers to the phenomenon that during oil and gas drilling operations, fluids such as oil, gas or water in the underground formation enter the drilling wellbore through cracks, pores or damage in the well wall. This phenomenon may lead to a series of serious problems, including interruption of drilling operations, pollution of the environment around the wellhead, increased construction safety risks and waste of precious resources. Well leakage not only affects the progress and economic benefits of the operation, but may also have an irreversible impact on the surrounding ecological environment.

[0003] During the drilling process, it is often necessary to add various plugging materials to the drilling fluid to effectively seal cracks and pores to prevent further infiltration of fluids. The selection of these plugging materials is very critical, and multiple factors must be considered, including the physical and chemical properties of the formation, the pressure bearing capacity of the formation, and the characteristics of the cracks. Commonly used plugging materials include graphite particles, calcium carbonate particles, and various polymers, which can improve the integrity of the well wall and reduce fluid leakage to a certain extent. However, although these materials have achieved certain results in practice, most of the well leakage still comes from fracture leakage, especially under complex geological conditions, where the leakage becomes more difficult.

[0004] At present, the underground conditions are becoming more and more complicated, especially when simulating underground leakage and storage loss, traditional devices and methods seem to be unable to cope with the situation. At present, the existing simulation devices on the market often cannot effectively simulate the leakage under the interference of multiphase flow, resulting in a large gap between experimental results and practical applications. This limitation makes the research and solution of leakage problems in drilling operations more difficult, and it is urgent to find new methods and technologies to cope with the ever-changing underground environment.

[0005] Therefore, we propose a plugging device for simulating leakage in narrow density window with spill and loss. Summary of the invention

[0006] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a leakage plugging device for simulating leakage in narrow density window overflow and loss well.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a leakage plugging device for simulating leakage in narrow density window overflow and coexisting well leakage, comprising a booster pump, a circulation cavity, a wellbore, an annular pressure pump, a feeding system, a core clamping system, a circulation system, an intelligent water injection gas system, and an intelligent filtrate analysis and measurement system. The feeding system comprises a first plugging slurry tank, a second plugging slurry tank and an agitator; the core clamping system comprises an end face filtration clamp, a fracture core and a second pressure sensor; the circulation system comprises a high-pressure circulation pump, a pneumatic three-way valve, and a pressure sensor; the intelligent water injection gas system comprises a water inlet, an air inlet, a pressure regulating valve, a horizontal flow pump and a flow meter; the intelligent filtrate analysis and measurement system comprises a piston container, a back pressure valve, a balance, a buffer container and a manual pump.

[0008] Preferably, the plugging slurry tank one and the plugging slurry tank two are connected to the circulation cavity via a booster pump.

[0009] Preferably, the end face filtration clamp is equipped with a second pressure sensor for real-time monitoring of pressure changes on the core end face.

[0010] Preferably, the circulation system is used to pump the plugging slurry into the wellbore and circulate it in the wellbore, simulating the circulation process of the plugging slurry in the fracture core.

[0011] Preferably, the water and gas injection intelligent system is used to simulate the plugging conditions under different water and gas volumes; the pressure regulating valve is used to adjust the pressure of the injected water or gas to simulate the plugging conditions under different formation pressures; the flow meter is used to measure the flow rate of the injected water or gas; the horizontal flow pump is used to promote the flow of water or gas in the wellbore to simulate the flow of formation fluid.

[0012] Preferably, the filtrate intelligent analysis and measurement system is used to measure the volume of liquid lost.

[0013] Preferably, the back pressure valve is used to control the pressure in the piston container to simulate the formation pressure; and the balance is used to measure the volume of the discharged pure water.

[0014] The present invention provides a device for simulating plugging of leaks in narrow density window with leakage and loss. It has the following beneficial effects:

[0015] 1. This is a plugging device for simulating leakage in narrow density window with co-existing well leakage. By simulating the dynamic process of formation water and gas flow and combining the circulation of plugging slurry in fracture core, the experimental device can carry out comprehensive tests under various environmental conditions. This dual slurry system design increases the flexibility of the experiment and can be adjusted according to the plugging effect, ensuring that the experiment is closer to the actual working conditions and providing a more comprehensive evaluation of material performance.

[0016] 2. This is a plugging device for narrow density window leakage and coexisting well leakage simulation. This device can systematically evaluate the plugging effect of different plugging materials, including key parameters such as plugging rate, filtration loss and filtration loss rate of plugging materials. By quantitatively analyzing the performance of different materials under specific conditions, researchers can select the most suitable plugging materials in a targeted manner, thereby improving the efficiency and safety of plugging operations. This kind of data support is particularly important when formulating plugging construction plans to ensure that the material selection during the construction process matches the engineering needs.

[0017] 3. This is a device for simulating plugging of leaks in narrow density window with leakage and loss. The experimental device has a simple structure design and convenient operation process, which greatly facilitates the setting and adjustment of experimental parameters. This user-friendly design not only improves the efficiency of the experiment, but also reduces the training cost of operators. In addition, the easy maintenance feature enables the experimental device to maintain high efficiency and stability in long-term use, reducing experimental interruptions caused by equipment failures, thereby ensuring the continuity and smooth progress of scientific research work.

[0018] 4. This is a plugging device for simulating leakage in narrow density window overflow and co-existing wells. The design of the device allows simulation of plugging conditions under different formation pressures, different water and gas volumes and different plugging materials, making it widely applicable. It can provide reliable experimental data support in the development of oil and gas fields under complex geological conditions and in the fields of groundwater management and protection. This flexibility makes the device not only suitable for basic research in scientific research institutions, but also suitable for practical applications in the oil, gas, mineral and other industries, providing support for technological progress in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the implementation or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0021] Figure 1 It is a schematic diagram of a device for simulating plugging of leaks in narrow density windows with leakage and loss in wells according to the present invention;

[0022] Legend:

[0023] 1. Leakage plugging slurry tank one; 101. Leakage plugging slurry tank two; 2. Booster pump; 3. Circulation cavity; 4. Wellbore; 5. End face filtration clamp; 6. Fracture core; 7. Annular pressure pump; 8. Pressure sensor one; 801. Pressure sensor two; 9. High-pressure circulation pump; 10. Pneumatic three-way valve; 11. Water inlet; 12. Air inlet; 13. Pressure regulating valve; 14. Flow meter; 15. Horizontal flow pump; 16. Piston container; 17. Back pressure valve; 18. Balance; 19. Buffer container; 20. Manual pump; 21. Agitator. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment: A device for simulating plugging of leaks in narrow density window with leakage and loss, such as Figure 1 As shown, it includes a booster pump 2, a circulation cavity 3, a wellbore 4, an annular pressure pump 7, a feeding system, a core clamping system, a circulation system, an intelligent water injection gas system, and an intelligent filtrate analysis and measurement system. The feeding system includes a plugging slurry tank 1, a plugging slurry tank 101 and an agitator 21; the core clamping system includes an end face filtration clamp 5, a fracture core 6 and a pressure sensor 801; the circulation system includes a high-pressure circulation pump 9, a pneumatic three-way valve 10, and a pressure sensor 8; the intelligent water injection gas system includes a water inlet 11, an air inlet 12, a pressure regulating valve 13, a horizontal flow pump 15 and a flow meter 14; the intelligent filtrate analysis and measurement system includes a piston container 16, a back pressure valve 17, a balance 18, a buffer container 19 and a manual pump 20.

[0026] The plugging slurry tank 1 and the plugging slurry tank 2 101 are respectively used to store different types of plugging slurries to cope with different plugging requirements and environmental conditions. Each plugging slurry tank is equipped with a stirrer 21, which can continuously stir to ensure the uniformity of the plugging slurry, thereby improving its plugging effect and construction quality; the plugging slurry tank 1 is connected to the circulation cavity 3 through a booster pump 2, and the booster pump 2 can efficiently deliver the plugging slurry stored in the tank into the circulation cavity 3 to ensure the fluidity and continuity of the slurry during the circulation process; the circulation cavity 3 is connected to the wellbore 4, which is a key component of the entire system. Responsible for transporting the plugging slurry to the area where the leakage actually occurs; the wellbore 4 is connected to the end face filtration clamp 5, which is used to fix the fracture core 6 to ensure the stability and accuracy of the core during the experiment; in order to simulate the annular pressure situation in actual use, the annular pressure pump 7 applies annular pressure to the end face filtration clamp 5, and simulates the real state of the rock in the underground environment by controlling the applied pressure; the pressure sensor 801 monitors the pressure change of the core end face in real time; the high-pressure circulation pump 9 and the pneumatic three-way valve 10 are used to circulate the plugging slurry to the wellbore 4 to ensure the plugging The slurry can continuously flow to the cracks, effectively filling and plugging potential leakage channels; the water inlet 11 and the gas inlet 12 are used to inject water or gas into the wellbore 4, providing different fluids required for the experiment and simulating various working conditions; the pressure regulating valve 13 is used to adjust the pressure of the injected water or gas to ensure that the injected fluid can flow under appropriate pressure, thereby optimizing the plugging effect; the flow meter 14 is used to accurately measure the flow of the injected water or gas, helping the operator to monitor and adjust the experimental parameters to ensure the repeatability and accuracy of the experiment; the horizontal flow pump 15 is used to promote the flow of water or gas in the wellbore 4, maintain the dynamic balance of the fluid, and avoid precipitation and stratification; the piston container 16 is used to collect the lost liquid, which can effectively monitor the performance and effect of the plugging slurry and ensure that the liquid loss in the plugging process is reasonably controlled; the back pressure valve 17 is used to control the pressure in the piston container 16 to ensure that the pressure inside the container is kept in a stable state, so as to better collect and analyze the characteristics of the lost liquid; the balance 18 is used to measure the volume of the lost liquid, provide real-time data to facilitate the evaluation of the performance and leakage of the plugging slurry, and provide a basis for subsequent adjustment and optimization.

[0027] Working principle of the present invention:

[0028] During use, when conducting a plugging experiment, first place the fractured core 6 in the end face filter holder 5, and apply annular pressure to it through the annular pressure pump 7 to simulate the formation pressure, so as to ensure that the core maintains a state similar to the actual underground environment during the experiment; the application of annular pressure not only helps to simulate the stress conditions of the rock in the natural state, but also ensures that the fractures will not undergo unnecessary changes due to external forces, thereby improving the reliability and accuracy of the experiment; then, the plugging slurry is pumped from the plugging slurry tank 1 and the plugging slurry tank 2 101 into the circulation cavity 3 through the booster pump 2. If the plugging slurry tank 1 cannot effectively seal the fracture during the experiment, the system can The high-pressure pump 2 injects the plugging liquid from the plugging slurry tank 101 into the circulation cavity 3, and then conducts a second round of circulation plugging experiment; at the same time, the plugging slurry is effectively circulated to the wellbore 4 through the high-pressure circulation pump 9 and the pneumatic three-way valve 10 to ensure that the slurry maintains uniformity and stability in the entire system and prevents precipitation or stratification caused by standing still; during the experiment, water or gas can be injected into the wellbore 4 through the water inlet 11 and the gas inlet 12 to simulate the flow of water and gas in the formation; this process can provide a variety of working conditions for the experiment, so as to study the performance and plugging effect of the plugging slurry under different conditions; at the same time, controlling the flow and pressure of water and gas is helpful to achieve different In-depth analysis of fluid interaction can further evaluate the plugging effect; pressure sensor 801 monitors the pressure changes at the core end face in real time and provides accurate pressure data so that the experimental parameters can be adjusted in time; flow meter 14 is responsible for measuring the flow rate of injected water or gas to ensure that the injection volume and speed of the fluid meet the actual formation conditions in the simulation experiment, ensuring the scientificity and accuracy of the experiment; piston container 16 is used to collect the lost liquid, which can effectively monitor the performance and filtration effect of the plugging slurry and evaluate its actual performance in the experiment; by accurately collecting and analyzing the lost liquid, the performance of the plugging slurry under different pressure and flow conditions can be obtained for subsequent Optimization provides data support, and the balance 18 is used to measure the volume of the lost liquid and provide real-time data to facilitate the evaluation of the leakage, thereby ensuring that the liquid loss during the experiment can be reasonably controlled; during the circulation process, the plugging slurry will pass through the piston container 16. If the pressure does not exceed the set value of the back pressure valve 17, the slurry will flow into the buffer container 19 to avoid entering the measurement system. Only when the pressure is greater than the set value of the back pressure valve 17, the lost liquid will be discharged into the balance 18 for accurate measurement. Through this process, the system ensures that only the lost liquid that meets the experimental conditions enters the measuring device, avoids unnecessary errors, and provides accurate plugging performance data.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for simulating plugging of leaks in narrow density window with leakage and loss, characterized in that: The invention comprises a booster pump (2), a circulation chamber (3), a wellbore (4), an annular pressure pump (7), a feeding system, a core clamping system, a circulation system, an intelligent water injection gas system, and an intelligent filtrate analysis and measurement system. The feeding system comprises a first plugging slurry tank (1), a second plugging slurry tank (101), and an agitator (21); the core clamping system comprises an end face filtration clamp (5), a fracture core (6), and a second pressure sensor (801); the circulation system comprises a high-pressure circulation pump (9), a pneumatic three-way valve (10), and a pressure sensor (8); the intelligent water injection gas system comprises a water inlet (11), a gas inlet (12), a pressure regulating valve (13), a horizontal flow pump (15), and a flow meter (14); and the intelligent filtrate analysis and measurement system comprises a piston container (16), a back pressure valve (17), a balance (18), a buffer container (19), and a manual pump (20).

2. The device for simulating plugging of leaks in narrow density window with leakage and loss according to claim 1, characterized in that: The plugging slurry tank one (1) and the plugging slurry tank two (101) are connected to the circulation cavity (3) via a booster pump (2).

3. The device for simulating plugging of leaks in narrow density window with leakage and loss according to claim 1, characterized in that: The end face filtration clamp (5) is equipped with a second pressure sensor (801) for real-time monitoring of the pressure changes on the end face of the core.

4. The device for simulating plugging of leaks in narrow density window with leakage and loss according to claim 1, characterized in that: The circulation system is used to pump the plugging slurry into the wellbore (4) and circulate it in the wellbore (4), simulating the circulation process of the plugging slurry in the fractured core (6).

5. The device for simulating plugging of leaks in narrow density window with leakage and loss according to claim 1, characterized in that: The water and gas injection intelligent system is used to simulate plugging conditions under different water and gas volumes; the pressure regulating valve (13) is used to adjust the pressure of the injected water or gas to simulate plugging conditions under different formation pressures; the flow meter (14) is used to measure the flow of the injected water or gas; and the horizontal flow pump (15) is used to push the water or gas to flow in the wellbore to simulate the flow of formation fluid.

6. The device for simulating plugging of leaks in narrow density window with leakage and loss according to claim 1, characterized in that: The filtrate intelligent analysis and measurement system is used to measure the volume of liquid lost by filtration.

7. The device for simulating plugging of leaks in narrow density window with leakage and loss according to claim 1, characterized in that: The back pressure valve (17) is used to control the pressure in the piston container (16) to simulate the formation pressure; the balance (18) is used to measure the volume of discharged pure water.

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