Preparation device of acid-based viscoelastic cleaning foam fracturing fluid for apertures and working method of preparation device

Abstract

The invention relates to the technical field of fracturing fluid preparation, in particular to an acid-based viscoelastic cleaning foam fracturing fluid preparation device for apertures and a working method thereof.The preparation device comprises a reaction kettle, the upper surface of the reaction kettle is fixedly connected with a feeding pipe, the outer surface of the reaction kettle is fixedly communicated with a discharging pipe, and the lower surface of the reaction kettle is fixedly connected with a water tank; the water supply device is used for providing appropriate water temperature for the reaction kettle, a stirring assembly and a driving assembly are arranged on the reaction kettle, the stirring assembly is used for stirring additives in the reaction kettle, and the driving assembly is used for enabling the stirring assembly to move up and down in a reciprocating mode. By means of the preparation device, the situation that the additive close to the stirring blades is stirred evenly, and the additive far away from the stirring blades is stirred unevenly can be avoided.

Description

Technical Field

[0001] This invention relates to the field of fracturing fluid preparation technology, specifically to an apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and its operating method. Background Technology

[0002] Acid-based viscoelastic clean foam fracturing fluid serves as a pre-fracturing fluid for oil and gas reservoirs containing adsorbed gas and oil. It constructs, connects, and expands nanopores to create pilot pores for further fracturing, laying the foundation for acid fracturing and proppant fracturing to build nanoscale, microscale, and millimeter-scale network fractures. This truly enables the industrial production of adsorbed gas and oil with exceptionally large reserves, such as coalbed methane and shale gas. Fracturing fluid refers to a heterogeneous and unstable chemical system formed by various additives in a certain proportion. It is the working fluid used when fracturing oil and gas reservoirs. Its main function is to transfer the high pressure generated by surface equipment to the formation, causing the formation to fracture and transport proppant along the fractures. Fracturing fluids are mostly prepared in reaction vessels.

[0003] Chinese Patent CN212189116U discloses a fracturing fluid preparation device with rapid mixing function, including a reaction vessel. A first drive motor is fixedly installed on the top of the reaction vessel. The same stirring rod is rotatably installed between the inner wall of the top and the inner wall of the bottom of the reaction vessel. The bottom end of the output shaft of the first drive motor extends into the reaction vessel and is fixedly connected to the top end of the stirring rod. A first inlet pipe is connected to and fixed on one side of the top of the reaction vessel, and a second inlet pipe is connected to and fixed on the other side of the top of the reaction vessel. A drain pipe is connected to and fixed on one side of the bottom of the reaction vessel. One end of the drain pipe is connected to and fixed to a first valve. A water tank with an open top is fixedly installed at the bottom of the reaction vessel.

[0004] The above-mentioned scheme has a simple structure and is easy to operate. It facilitates timely alarm processing when the water temperature in the tank rises to a suitable temperature, thus preventing the various additives in the reactor from being heated to an excessively high temperature, which would affect the reaction effect and is beneficial to use. However, in the process of stirring the additives in the reactor, the stirring rod can only rotate in the same position. This results in the additives near the stirring rod being stirred more evenly, while the additives far from the stirring rod are stirred less evenly, which in turn affects the overall mixing effect of the additives. Summary of the Invention

[0005] This invention provides an apparatus and method for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures, aiming to solve the problem of uneven mixing of additives during the preparation of fracturing fluids.

[0006] The objective of this invention is achieved through the following technical solutions: In a first aspect, the present invention provides an apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures, comprising a reaction vessel, a feed pipe fixedly connected to the upper surface of the reaction vessel, a discharge pipe fixedly connected to the outer surface of the reaction vessel, and a water tank fixedly connected to the lower surface of the reaction vessel for providing a suitable water temperature for the reaction vessel. The reaction vessel is provided with a stirring assembly and a driving assembly. The stirring assembly is used to stir the additives inside the reaction vessel, and the driving assembly is used to move the stirring assembly up and down reciprocally.

[0007] As a further improvement of the present invention, the reaction vessel and the water tank are fixedly connected by a reinforcement component. As a further improvement of the present invention, the reinforcement component includes a U-shaped connecting plate fixedly connected to the back of the water tank. The U-shaped connecting plate has an arc-shaped groove adapted to the reactor inside, and the inner wall of the arc-shaped groove is fixedly connected to the outer surface of the reactor. A reinforcement plate is fixedly connected inside the U-shaped connecting plate. As a further improvement of the present invention, a water inlet pipe is fixedly connected to the upper surface of the water tank, a drain pipe is fixedly connected to the side, and a heating wire is installed inside. As a further improvement of the present invention, a temperature monitor is also installed on the side of the water tank. The temperature measuring end of the temperature monitor is inserted into the inside of the water tank, and the temperature monitor is used to monitor the temperature of the water inside the water tank. As a further improvement of the present invention, the stirring assembly includes a right-angle plate, on which a first motor is mounted. The output end of the first motor is fixedly connected to a rotating shaft, and the end of the rotating shaft away from the first motor is inserted into the interior of the reaction vessel. As a further improvement of the present invention, a set of stirring blades is fixedly connected to the outer surface of the rotating shaft, and the stirring blades are all located inside the reaction vessel.

[0008] As a further improvement of the present invention, the driving assembly includes a Z-shaped plate fixedly connected to the upper surface of the reactor, a threaded block slidably connected to the Z-shaped plate, and the side of the threaded block away from the Z-shaped plate being fixedly connected to the outer surface of the right-angle plate.

[0009] As a further improvement of the present invention, a second motor is installed on the upper surface of the Z-shaped plate, and a reciprocating screw is fixedly connected to the output end of the second motor. The threaded block has a threaded hole adapted to the reciprocating screw and is threadedly connected to the reciprocating screw. The end of the reciprocating screw away from the second motor passes through the Z-shaped plate and the threaded hole in sequence and is rotatably connected to the inside of the reactor. Secondly, the present invention also provides a method for operating an apparatus for preparing an acid-based viscoelastic cleaning foam fracturing fluid for pores and fissures, the method comprising: Various additives for preparing acid-based viscoelastic cleaning foam fracturing are added to the interior of the reactor; Add water at the set temperature to the water tank to provide the heat required for the additive reaction in the reactor; Start the stirring assembly, and drive the stirring assembly to move it up and down reciprocally.

[0010] The beneficial effects of this invention are as follows: This invention provides an apparatus for preparing acid-based viscoelastic cleaning foam fracturing fluid for pores and fissures. The acid-based viscoelastic cleaning foam fracturing fluid is prepared in a reaction vessel. Each additive can be fed into the reaction vessel through a feed pipe to carry out a series of chemical reactions. During this process, a water tank provides the heat required for the reaction of each additive in the reaction vessel. Through the cooperation between the stirring component and the driving component, the stirring blades can be driven to move up and down reciprocally during the stirring of the additives inside the reaction vessel. This avoids the situation where the additives near the stirring blades are stirred more evenly, while the additives far from the stirring blades are stirred less evenly, thereby effectively improving the overall mixing effect of the additives.

[0011] Furthermore, by setting up reinforcement components, the present invention can effectively improve the connection stability between the water tank and the reaction vessel. By setting up a temperature monitor, the water temperature inside the water tank can be monitored in real time, so that the heating wire can be shut off in time when the water temperature inside the water tank is too high.

[0012] Furthermore, by incorporating reinforcement components, this invention can improve the connection stability between the water tank and the reactor, thereby enhancing the stability of the reactor during operation.

[0013] Furthermore, this invention monitors the temperature of the water inside the tank by installing a temperature monitor on the side of the tank, thereby providing a suitable water temperature for the additive.

[0014] Furthermore, the present invention uses a second motor to drive a reciprocating screw to rotate. The rotation of the reciprocating screw drives the threaded block to move up and down along the reciprocating screw, which in turn drives the stirring assembly to move up and down. This avoids the situation where the additives closer to the stirring blades are stirred more evenly, while the additives farther away from the stirring blades are stirred less evenly, thereby effectively improving the overall mixing effect of the additives. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the device in an embodiment of the present invention; Figure 2 This is a top view of the device in an embodiment of the present invention; Figure 3 This is an embodiment of the present invention. Figure 2 Sectional view along axis AA; Figure 4 This is a three-dimensional structural diagram of the stirring assembly and the driving assembly in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the hidden stirring component and driving component in an embodiment of the present invention; In the diagram: 1. Water tank; 2. Reactor; 3. Reinforcing assembly; 301. U-shaped connecting plate; 302. Reinforcing plate; 4. Feeding pipe; 5. Discharge pipe; 6. Water supply pipe; 7. Drainage pipe; 8. Stirring assembly; 801. Right-angle plate; 802. First motor; 803. Rotating shaft; 804. Stirring blade; 9. Drive assembly; 901. Z-shaped plate; 902. Second motor; 903. Reciprocating screw; 904. Threaded block; 10. Temperature monitor; 11. Heating wire. Detailed Implementation

[0017] To make the objectives and technical solutions of this invention clearer and easier to understand, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0018] The present invention provides an apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures, comprising a reaction vessel 2, a feed pipe 4 fixedly connected to the upper surface of the reaction vessel 2, a discharge pipe 5 fixedly connected to the outer surface of the reaction vessel 2, and a water tank 1 fixedly connected to the lower surface of the reaction vessel 2 for providing a suitable water temperature for the reaction vessel 2. The reaction vessel 2 is provided with a stirring assembly 8 and a driving assembly 9. The stirring assembly 8 is used to stir the additives inside the reaction vessel 2, and the driving assembly 9 is used to move the stirring assembly 8 up and down reciprocally.

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1 like Figure 1 The apparatus shown is for preparing acid-based viscoelastic cleaning foam fracturing fluid for pores and fissures. It includes a reactor 2, with a feed pipe 4 fixedly connected to the upper surface of the reactor 2, a discharge pipe 5 fixedly connected to the outer surface, and a water tank 1 fixedly connected to the lower surface to provide a suitable water temperature for the reactor 2. The reactor 2 is equipped with a stirring assembly 8 and a driving assembly 9. The stirring assembly 8 is used to stir the additives inside the reactor 2, and the driving assembly 9 is used to move the stirring assembly 8 up and down.

[0021] In this embodiment, the acid-based viscoelastic cleaning foam fracturing fluid is prepared in a reactor. Each additive can be fed into the reactor through a feed pipe to undergo a series of chemical reactions to obtain the fracturing fluid, which is then discharged through a discharge pipe. During the reaction of each additive, a water tank provides the heat required for the reaction of each additive in the reactor. Through the cooperation between the stirring component and the drive component 9, the stirring blades can be driven to move up and down reciprocally during the stirring of the additives inside the reactor. This avoids the situation where the additives near the stirring blades are stirred more evenly, while the additives far from the stirring blades are stirred less evenly, thereby effectively improving the overall mixing effect of the additives.

[0022] Example 2 As another embodiment, see Figure 1 , Figure 2 and Figure 5 This embodiment proposes an apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fractures. The apparatus includes a water tank 1, a reaction vessel 2 fixedly connected to the upper surface of the water tank 1, and two feed pipes 4 fixedly connected to the upper surface of the reaction vessel 2. Each feed pipe 4 has a first cap threaded onto its outer surface. After unscrewing the first cap from the feed pipe 4, various additives for preparing the fracturing fluid can be added to the interior of the reaction vessel 2 through the feed pipes 4. A discharge pipe 5 is fixedly connected to the outer surface of the reaction vessel 2, and a second cap is threaded onto the outer surface of the discharge pipe 5. After unscrewing the second cap from the discharge pipe 5, the prepared fracturing fluid can be discharged from the interior of the reaction vessel 2 through the discharge pipe 5. A water inlet pipe 6 is fixedly connected to the upper surface of water tank 1. A third pipe cap is threaded onto the outer surface of water inlet pipe 6. After unscrewing the third pipe cap from water inlet pipe 6, water can be added into the interior of water tank 1 through water inlet pipe 6. A drain pipe 7 is fixedly connected to the left side of water tank 1. A fourth pipe cap is threaded onto the outer surface of drain pipe 7. After unscrewing the fourth pipe cap from drain pipe 7, water inside water tank 1 can be drained through drain pipe 7. A heating wire 11 is installed inside water tank 1. After turning on heating wire 11, the water inside water tank 1 can be heated. The heat generated during the heating process can be conducted to reaction vessel 2, and reaction vessel 2 can conduct heat to various additives inside it. In this embodiment, heating wire 11 can be replaced by other heating devices, such as heating rods, heating packs, etc., which have the same function as heating wire. The heating wire 11 (or optional heating rod, heating pack, etc.) installed in the water tank 1 can effectively and evenly heat the water source, and transfer the heat to the reaction vessel 2 and the additives inside it through heat conduction, thereby accelerating the chemical reaction process and ensuring the efficient preparation of fracturing fluid.

[0023] A reinforcing assembly 3 is fixedly connected between the water tank 1 and the reactor 2. The reinforcing assembly 3 includes a U-shaped connecting plate 301 fixedly connected to the back of the water tank 1. The U-shaped connecting plate 301 has an arc-shaped groove inside that fits the reactor 2, and the inner wall of the arc-shaped groove is fixedly connected to the outer surface of the reactor 2. A reinforcing plate 302 is fixedly connected inside the U-shaped connecting plate 301. By setting the reinforcing assembly 3, the connection stability between the water tank 1 and the reactor 2 can be effectively improved, thereby improving the stability of the reactor 2 during operation. The combined effect of the U-shaped connecting plate 301 and the reinforcing plate 302 significantly enhances the connection strength between the water tank 1 and the reactor 2, reducing the risk of displacement or damage caused by equipment vibration or external impact, and ensuring the stability and safety of the preparation process. The arc-shaped groove inside the U-shaped connecting plate 301 precisely fits the shape of the reactor 2, ensuring a tight fit between the two and further improving the structural stability.

[0024] The design of the pipe caps at different locations facilitates the input and output of different fluids and avoids liquid leakage when not in operation, thereby increasing the safety and flexibility of the equipment.

[0025] Example 3 The solution in Example 1 will be further described below with reference to its specific working method. like Figure 3 and Figure 5 As shown, in a preferred embodiment of Embodiments 1 and 2, based on the above-described method, a temperature monitor 10 is further installed on the right side of the water tank 1, and the temperature measuring end of the temperature monitor 10 is inserted into the interior of the water tank 1. The temperature monitor 10 is used to monitor the temperature of the water inside the water tank 1. By monitoring the water temperature inside the water tank 1 in real time, the heating wire 11 can be shut off in time when the water temperature inside the water tank 1 is too high. The temperature measuring end of the temperature monitor 10 is directly inserted into the interior of the water tank 1, enabling real-time and accurate monitoring of water temperature changes. This direct measurement method is more reliable than indirect estimation and helps to detect potential overheating risks in a timely manner. When the temperature monitor 10 detects that the water temperature inside the water tank 1 exceeds the preset safety threshold, it will immediately trigger the overheating warning mechanism. The system can notify the operator through audible and visual alarms, display screen prompts, etc., and automatically cut off the power supply to the heating wire 11 to prevent the water temperature from continuing to rise and causing a safety accident. At the same time, this information can also be recorded in the historical data of the equipment for subsequent analysis and improvement.

[0026] In another preferred embodiment of this invention, the data from the temperature monitor 10 can be transmitted via a network connection to a remote monitoring center or the operator's mobile device. This allows the operator to monitor the water temperature of the water tank 1 in real time, regardless of their location, and to remotely control the equipment as needed. This remote monitoring and control capability greatly improves the flexibility and operability of the equipment.

[0027] To ensure the accuracy and reliability of the temperature monitor 10, regular calibration and maintenance are required. The system can automatically record the usage time and calibration cycle of the temperature monitor 10, and remind the operator to perform calibration or replacement when the predetermined time arrives. This mechanism of regular calibration and maintenance helps to maintain the long-term stable operation of the equipment.

[0028] Example 4 The solution in Example 1 will be further described below with reference to its specific working method. like Figure 1 , Figure 3 and Figure 4 As shown, as a preferred embodiment, based on the above three embodiments, the stirring assembly 8 further includes a right-angle plate 801, on which a first motor 802 is mounted. The output end of the first motor 802 is fixedly connected to a rotating shaft 803. The end of the rotating shaft 803 away from the first motor 802 is inserted into the interior of the reactor 2. A set of stirring blades 804 are fixedly connected to the outer surface of the rotating shaft 803. All of the stirring blades 804 are located inside the reactor 2.

[0029] Furthermore, a multi-stage stirring structure, such as two or more layers of stirring blades 804, is added to the rotating shaft 803. The number, shape, and angle of each layer of stirring blades can be optimized according to actual needs. Multiple layers of stirring blades can simultaneously stir at different heights, thereby enhancing the uniformity and efficiency of stirring, especially for high-viscosity or easily sedimented additives.

[0030] The stirring blade 804 can be made of a special wear-resistant and corrosion-resistant material to cope with the chemical erosion that may be caused by different additives. At the same time, the shape of the stirring blade 804 should also be optimized according to the characteristics of the additives and the shape of the reaction vessel, such as using a spiral, fan, or serrated shape to improve stirring efficiency and mixing uniformity. To facilitate cleaning and replacement of worn stirring blades, the stirring blade 804 is designed with a detachable structure.

[0031] In another preferred embodiment of this invention, a force sensor is integrated into the stirring assembly 8 to monitor changes in resistance during the stirring process in real time. Through a feedback system, the stirring intensity and rotation speed can be automatically adjusted based on the resistance level, ensuring effective stirring while avoiding the adverse effects of over-stirring on the reaction process.

[0032] Depending on the reaction process and the characteristics of the additives, the stirring component 8 has multiple stirring modes, such as unidirectional rotation, bidirectional alternating rotation, and intermittent stirring.

[0033] After adding various additives for preparing fracturing fluid into the interior of reactor 2, the first motor 802 is started. The first motor 802 can drive the rotating shaft 803 and the stirring blade 804 to rotate. The rotation of the stirring blade 804 can stir and mix the various additives inside reactor 2.

[0034] The first motor 802 should be configured as a variable speed motor to adjust the speed according to the stirring requirements. In the initial stages of stirring, a higher speed can be used to quickly mix the additives; as the reaction progresses, the speed can be reduced to minimize the impact of shear force on the reaction process while maintaining stirring effectiveness. This variable speed control helps improve the flexibility and adaptability of the stirring process.

[0035] Example 5 The solution in Example 3 will be further described below with reference to its specific working method. See Figure 1 , Figure 3 and Figure 4 As a preferred embodiment, based on the above method, the driving component 9 further includes a Z-shaped plate 901 fixedly connected to the upper surface of the reactor 2, a threaded block 904 slidably connected to the Z-shaped plate 901, the side of the threaded block 904 away from the Z-shaped plate 901 being fixedly connected to the outer surface of the right-angle plate 801, a boss being provided on the side of the threaded block 904 away from the right-angle plate 801, and a groove adapted to the boss being opened inside the Z-shaped plate 901.

[0036] A second motor 902 is mounted on the upper surface of the Z-shaped plate 901. A reciprocating screw 903 is fixedly connected to the output end of the second motor 902. A threaded hole adapted to the reciprocating screw 903 is opened inside the threaded block 904 and threadedly connected to the reciprocating screw 903. The end of the reciprocating screw 903 away from the second motor 902 passes through the Z-shaped plate 901 and the threaded hole in sequence and is rotatably connected inside the reactor 2.

[0037] In this embodiment, a high-precision, low-friction reciprocating lead screw 903 is preferentially selected to reduce motion instability caused by errors in the lead screw itself. Simultaneously, the lead screw is regularly lubricated and maintained to ensure its long-term stable operation.

[0038] During the stirring of various additives inside the reactor 2, the second motor 902 is started. The second motor 902 drives the reciprocating screw 903 to rotate. The rotation of the reciprocating screw 903 drives the threaded block 904 to move up and down along the reciprocating screw 903. The up and down movement of the threaded block 904 along the reciprocating screw 903 drives the stirring assembly 8 to move up and down. This avoids the situation where the additives near the stirring blade 804 are stirred more evenly, while the additives far from the stirring blade 804 are stirred less evenly, thus effectively improving the overall mixing effect of the additives.

[0039] Furthermore, as another preferred embodiment of this invention, the speed, direction of rotation of the second motor 902, and the stroke of the reciprocating screw 903 are programmed and controlled using a PLC or other programmable controller. According to the characteristics of the materials being stirred and the needs of the reaction process, the stirring parameters can be flexibly adjusted to achieve intelligent control of the stirring process.

[0040] The stroke and position of the reciprocating screw 903 are calibrated regularly to ensure that the stirring assembly 8 can move accurately within a predetermined range. Simultaneously, sensors monitor vibration and noise signals during the stirring process in real time, automatically compensating for any possible deviations to improve the uniformity and stability of the stirring.

[0041] In addition, as another preferred embodiment of this invention, an emergency braking system is provided in the preparation device. Once an abnormal situation (such as over-temperature, over-pressure, motor failure, etc.) is detected, the power supply can be cut off immediately and the movement of the stirring component 8 and the driving component 9 can be stopped to ensure the safety of the equipment and the operators.

[0042] Example 6 As another embodiment, the operating method of the acid-based viscoelastic clean foam fracturing fluid preparation device for pores and fissures in Example 1 is as follows: Before starting the equipment, conduct a comprehensive safety check, including checking that the power connection is secure, all components are installed in place, and that the safety valves and emergency braking system are effective.

[0043] Key components such as reactor 2, water tank 1, and stirring assembly 8 are cleaned and disinfected to ensure that there are no impurities or contaminants remaining, so as not to affect the quality of fracturing fluid.

[0044] Various additives for preparing acid-based viscoelastic cleaning foam fracturing are added to the interior of reactor 2. Specifically, according to the reaction characteristics and formulation requirements of the additives, the additives are added to reactor 2 one by one in a certain order. For additives that require premixing, they should be mixed evenly in a container before being added.

[0045] Add water at the set temperature to water tank 1 to provide the heat required for the additive reaction in reactor 2. Add an appropriate amount of water to water tank 1 and set a suitable temperature according to the formula requirements. Use temperature monitor 10 to monitor the water temperature in real time to ensure that the water temperature remains stable within the set range. Turn on the heating system to provide heat to reactor 2 through water tank 1. During the heating process, carefully observe the water temperature changes to avoid overheating.

[0046] Start the stirring assembly 8, which is then driven by the drive assembly 9 to move up and down reciprocatingly. After confirming that all additives have been added to the reaction vessel 2 and the water temperature has reached the set value, start the stirring assembly 8. Simultaneously, start the drive assembly 9 to move the stirring assembly 8 up and down reciprocatingly within the reaction vessel 2 to enhance the stirring effect. Adjust the rotation speed, moving speed, and moving range of the stirring assembly 8 as needed, according to the characteristics of the additives and the requirements of the reaction process, to achieve the best stirring effect.

[0047] When the reaction reaches the preset time or the expected reaction effect, stop heating and stirring. After preparation, promptly clean and maintain components such as reaction vessel 2, water tank 1, and stirring assembly 8 to prepare for the next use.

[0048] During the reaction, temperature and pressure sensors are used to monitor the temperature and pressure changes inside reactor 2 in real time. If any abnormality is detected, appropriate measures are taken immediately to adjust or stop the reaction.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures, characterized in that, The reactor includes a reaction vessel (2), with a feeding pipe (4) fixedly connected to the upper surface of the reaction vessel (2), a discharge pipe (5) fixedly connected to the outer surface, and a water tank (1) fixedly connected to the lower surface to provide a suitable water temperature for the reaction vessel (2). The reaction vessel (2) is equipped with a stirring assembly (8) and a driving assembly (9). The stirring assembly (8) is used to stir the additives inside the reaction vessel (2), and the driving assembly (9) is used to move the stirring assembly (8) up and down.

2. The apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures according to claim 1, characterized in that, The reactor (2) and the water tank (1) are fixedly connected by a reinforcement component (3).

3. The apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures according to claim 2, characterized in that, The reinforcement component (3) includes a U-shaped connecting plate (301) fixedly connected to the back of the water tank (1). The U-shaped connecting plate (301) has an arc-shaped groove inside that is adapted to the reactor (2), and the inner wall of the arc-shaped groove is fixedly connected to the outer surface of the reactor (2). A reinforcement plate (302) is fixedly connected inside the U-shaped connecting plate (301).

4. The apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures according to claim 1, characterized in that, The water tank (1) has a water inlet pipe (6) fixedly connected to its upper surface, a drain pipe (7) fixedly connected to its side, and a heating wire (11) installed inside.

5. The apparatus for preparing acid-based viscoelastic cleaning foam fracturing fluid for pores and fissures according to claim 4, characterized in that, A temperature monitor (10) is also installed on the side of the water tank (1). The temperature measuring end of the temperature monitor (10) is inserted into the inside of the water tank. The temperature monitor (10) is used to monitor the temperature of the water inside the water tank (1).

6. The apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures according to claim 1, characterized in that, The stirring assembly (8) includes a right-angle plate (801), on which a first motor (802) is mounted. The output end of the first motor (802) is fixedly connected to a rotating shaft (803), and the end of the rotating shaft (803) away from the first motor is inserted into the interior of the reactor.

7. The apparatus for preparing acid-based viscoelastic cleaning foam fracturing fluid for pores and fissures according to claim 6, characterized in that, A set of stirring blades (804) are fixedly connected to the outer surface of the rotating shaft (803), and the stirring blades (804) are all located inside the reactor (2).

8. The apparatus for preparing acid-based viscoelastic clean foam fracturing fluid for pores and fissures according to claim 1, characterized in that, The drive assembly (9) includes a Z-shaped plate (901) fixedly connected to the upper surface of the reactor. A threaded block (904) is slidably connected to the Z-shaped plate (901). The side of the threaded block (904) away from the Z-shaped plate (901) is fixedly connected to the outer surface of the right-angle plate (801).

9. The testing equipment for self-generating expandable foam gel according to claim 8, characterized in that, The upper surface of the Z-shaped plate (901) is equipped with a second motor (902), and the output end of the second motor (902) is fixedly connected to a reciprocating lead screw (903). The threaded block (904) has a threaded hole that matches the reciprocating lead screw (903) and is threadedly connected to the reciprocating lead screw. The end of the reciprocating lead screw (903) away from the second motor (902) passes through the Z-shaped plate (901) and the threaded hole in sequence and is rotatably connected to the inside of the reactor (2).

10. A method for operating an apparatus for preparing acid-based viscoelastic cleaning foam fracturing fluid for pores and fractures, based on the apparatus for preparing acid-based viscoelastic cleaning foam fracturing fluid for pores and fractures according to any one of claims 1-9, characterized in that, This working method includes: Various additives for preparing acid-based viscoelastic cleaning foam fracturing were added to the interior of the reactor (2); Water at a set temperature is added to the water tank (1) to provide the heat required for the reaction of the additives in the reactor (2); Start the stirring assembly (8), and drive the stirring assembly (8) to move up and down reciprocally through the drive assembly (9).

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