A nano-bubble sand mixing device for reinforced foam fracturing fluid

Abstract

The utility model discloses a kind of nano bubble sand mixing devices for reinforced foam fracturing fluid, including nano foam fracturing fluid sand mixing device and the nano bubble generator of being communicated by gas guide pipe, the manifold of external water-based fracturing fluid is communicated and arranged in the top of nano foam fracturing fluid sand mixing device, the inside of nano foam fracturing fluid sand mixing device is equipped with stirring structure, the axis of gas guide pipe is 30 °-45 ° inclined setting with the lateral wall of nano foam fracturing fluid sand mixing device.In the scheme, nano foam fracturing fluid sand mixing device and nano bubble generator are directly communicated by gas guide pipe, cooperate the manifold of external water-based fracturing fluid and form integrated online sand mixing structure, realize that fracturing base fluid and gas directly generate nanometer stable foam in nano foam fracturing fluid sand mixing device and complete sanding operation simultaneously, make sand-carrying fluid keep high sand concentration and foam stability, simplify the multistage processing flow of traditional foam fracturing.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field development technology, specifically to a nanobubble sand mixing device for enhanced foam fracturing fluid. Background Technology

[0002] Oil and gas resource exploration and development face increasing challenges, especially in low-permeability oil and gas reservoirs and coalbed methane development, where conventional extraction technologies are no longer sufficient. Fracturing, as a common reservoir stimulation method, also faces technological upgrades and innovations. Traditional water-based fracturing fluids in reservoir stimulation typically suffer from negative impacts such as large fluid consumption, long flowback times, and incomplete flowback. In water-sensitive, low-permeability reservoirs, it can even cause water-locking damage, severely affecting oil and gas resource development and utilization. In contrast, foam fracturing fluids offer advantages such as lower fluid consumption, more thorough flowback, reduced secondary reservoir damage, and lower chemical additive requirements, making them increasingly suitable for reservoir stimulation in unconventional oil and gas fields.

[0003] In a proppant mixing truck, proppant (particles) is added to foam fracturing fluid via a mixing device to form a "foam-particle" mixture. The proppant (particles) then need to enter the fracture along with the fracturing fluid. However, foam fracturing fluid relies on surfactants (such as sodium dodecyl sulfate) to form an adsorption film at the gas-liquid interface. At high proppant concentrations, particle collisions can mechanically damage this interfacial film, leading to bubble rupture. Alternatively, high proppant concentrations can increase shear forces during fluid discharge. Both of these situations result in poor foam stability, making it impossible to meet the requirements for high proppant concentrations. Furthermore, when the proppant mixing truck is moving or operating with equipment, relying solely on its own shock absorption system provides insufficient protection and cushioning against equipment vibrations. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a nanobubble sand mixing device for enhanced foam fracturing fluid, which solves the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a nano-bubble fracturing fluid mixing device for enhanced foam fracturing fluid, comprising a nano-foam fracturing fluid mixing device and a nano-bubble generating device connected via an air guide pipe. The top of the nano-foam fracturing fluid mixing device is connected to a manifold for external water-based fracturing fluid. The nano-foam fracturing fluid mixing device has an internal stirring structure. The axis of the air guide pipe is inclined at 30°-45° to the side wall of the nano-foam fracturing fluid mixing device, and the end of the air guide pipe near the nano-foam fracturing fluid mixing device is lower than the end away from the nano-foam fracturing fluid mixing device.

[0008] Preferably, the nanofoam fracturing fluid mixing device has a sand inlet at the top and a sand outlet at the bottom, and a valve is provided on the outlet.

[0009] Preferably, it also includes a sand mixing truck and multiple buffer components fixedly installed on the sand mixing truck. The upper ends of the buffer components are all fixedly connected to a horizontally set support plate. The nanofoam fracturing fluid sand mixing device and the nanobubble generating device are both fixedly installed on the top of the support plate.

[0010] Preferably, each of the buffer components includes a base plate fixedly connected to the sand mixing vehicle, a lower arc plate fixedly connected to the top of the base plate on an axisymmetrical basis, an upper arc plate slidably connected to the inner sidewall of the lower arc plate, a top plate fixedly connected to the top surface of the two upper arc plates, and a damper and a spring fixedly connected between the top plate and the base plate, with the spring sleeved on the damper.

[0011] Preferably, the arc-shaped contact surfaces of the lower arc plate and the upper arc plate contact each other to form a sliding guide structure, a guide pin is fixedly connected to the outer wall of the upper arc plate, a guide opening is provided on the lower arc plate, and the guide pin is slidably disposed inside the guide opening.

[0012] Preferably, the number of buffer components provided on the top of the sand mixing vehicle is five, and they are respectively located at the four corners and the center of the support plate.

[0013] (III) Beneficial Effects

[0014] This invention provides a nanobubble sand mixing device for enhanced foam fracturing fluid, which has the following beneficial effects:

[0015] 1. In this utility model, the nano-foam fracturing fluid mixing device and the nano-bubble generator are directly connected through a gas guide pipe, forming an integrated online mixing structure with the manifold of the external water-based fracturing fluid. This enables the fracturing base fluid and gas to directly generate nano-scale stable foam in the nano-foam fracturing fluid mixing device and simultaneously complete the sand addition operation. The micro-nano bubbles generated by the nano-bubble generator are directionally transported through the gas guide pipe and form hydrogen bond reinforcement with the sand particles in the nano-foam fracturing fluid mixing device. This ensures that the sand-carrying fluid maintains a high sand concentration and foam stability, effectively simplifying the multi-stage processing flow of traditional foam fracturing.

[0016] 2. In this utility model, a multi-layer shock absorption and protection system is constructed by the buffer components arranged on the top of the sand mixing truck and the bearing plate; the hydraulic damping characteristics of the damper and the elastic deformation of the spring work together to absorb the impact energy, and the friction generated by the arc sliding contact between the lower arc plate and the upper arc plate also has a buffering effect; at the same time, the five buffer components at the four corners and the center position form a distributed support to ensure that the nano-foam fracturing fluid sand mixing device and nano-bubble generating device integrated on the bearing plate maintain structural stability during the movement or operation of the sand mixing truck. Attached Figure Description

[0017] Figure 1 This is a front-view three-dimensional structural diagram of a nano-bubble sand mixing device for enhanced foam fracturing fluid proposed in this utility model;

[0018] Figure 2 for Figure 1 Exploded structure diagram;

[0019] Figure 3 This is a partial structural diagram of a nanobubble sand mixing device for enhanced foam fracturing fluid proposed in this utility model;

[0020] Figure 4 This is an exploded structural diagram of the buffer component of a nanobubble sand mixing device for enhanced foam fracturing fluid proposed in this utility model;

[0021] Figure 5 This is a structural diagram of the buffer component of a nanobubble sand mixing device for reinforced foam fracturing fluid proposed in this utility model.

[0022] In the diagram: 1. Nanofoam fracturing fluid mixing device; 2. Manifold; 3. Air duct; 4. Nanobubble generator; 5. Mixing vehicle; 6. Buffer assembly; 61. Base plate; 62. Lower arc plate; 621. Guide port; 63. Upper arc plate; 631. Guide pin; 64. Top plate; 65. Damper; 66. Spring; 7. Bearing plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figures 1 to 5This utility model provides a technical solution: a nano-bubble sand mixing device for enhanced foam fracturing fluid, comprising a nano-foam fracturing fluid sand mixing device 1 and a nano-bubble generating device 4 connected by a gas guide pipe 3. The top of the nano-foam fracturing fluid sand mixing device 1 is connected to a manifold 2 for external water-based fracturing fluid. The nano-foam fracturing fluid sand mixing device 1 is equipped with a stirring structure inside. The axis of the gas guide pipe 3 is inclined at 30°-45° to the side wall of the nano-foam fracturing fluid sand mixing device 1. The end of the gas guide pipe 3 near the nano-foam fracturing fluid sand mixing device 1 is lower than the end away from the nano-foam fracturing fluid sand mixing device 1. This angle design allows the gas and fracturing fluid to form a spiral flow path in the nano-foam fracturing fluid sand mixing device 1, enhancing the contact area and mixing uniformity between the bubbles and sand particles. At the same time, the inclined structure reduces the deposition of sand particles at the inlet of the gas guide pipe 3, ensuring the efficient generation and stable delivery of nano-foam sand-carrying fluid, thereby improving the foam stability and sand concentration control accuracy in fracturing operations.

[0025] The nano-foam fracturing fluid mixing device 1 and the nano-bubble generator 4 are directly connected through the gas guide pipe 3. Together with the external water-based fracturing fluid manifold 2 and the sand delivery pipe, they form an integrated online sand mixing structure. This allows the fracturing base fluid and gas to directly generate nano-scale stable foam within the nano-foam fracturing fluid mixing device 1 and simultaneously complete the sand addition operation. Specifically, the micro-nano bubbles generated by the nano-bubble generator 4 are directionally transported to the inside of the nano-foam fracturing fluid mixing device 1 through the gas guide pipe 3. The water-based fracturing fluid is transported to the nano-foam fracturing fluid mixing device 1 through the manifold 2, and the sand is also input into the nano-foam fracturing fluid mixing device 1 through the external sand delivery pipe. The micro-nano bubbles and the sand particles in the nano-foam fracturing fluid mixing device 1 form hydrogen bonds to strengthen the bond, so that the sand-carrying fluid maintains a high sand concentration and foam stability, effectively simplifying the multi-stage processing flow of traditional foam fracturing.

[0026] The nanofoam fracturing fluid mixing device 1 has a sand inlet at the top and a sand outlet at the bottom. The outlet is equipped with a valve for controlling its opening and closing, which is not shown in the figure. Since this is not the direction of improvement in this paper, it will not be described in detail.

[0027] Sand particles are added online through the top sand feed inlet of the nano-foam fracturing fluid mixing device 1. The external sand conveying pipe is connected to the sand feed inlet. After the micro-nano bubbles combine with the fracturing fluid and sand particles, they are discharged together through the discharge outlet.

[0028] Reference Figure 1 It also includes a sand mixing truck 5 and multiple buffer components 6 fixedly installed on the sand mixing truck 5. The upper ends of the buffer components 6 are all fixedly connected to a horizontally set support plate 7. The nano foam fracturing fluid sand mixing device 1 and the nano bubble generating device 4 are both fixedly installed on the top of the support plate 7.

[0029] The buffer assembly 6 and the bearing plate 7 form a shock absorption and protection system to ensure that the nano-foam fracturing fluid mixing device 1 and the nano-bubble generator 4 integrated on the bearing plate 7 maintain structural stability during the movement or operation of the mixing vehicle 5.

[0030] Reference Figure 4 Specifically, each set of buffer components 6 includes a base plate 61 fixedly connected to the sand mixing vehicle 5. A lower arc plate 62 is fixedly connected to the top of the base plate 61 on an axisymmetrical basis. An upper arc plate 63 is slidably connected to the inner side wall of the lower arc plate 62. A top plate 64 is fixedly connected to the top surface of the two upper arc plates 63. A damper 65 and a spring 66 are fixedly connected between the top plate 64 and the base plate 61. The spring 66 is sleeved on the damper 65. The damper 65 is a prior art product.

[0031] The hydraulic damping effect of the damper 65 and the elastic reset of the spring 66 work together to suppress vibration and impact. When the vehicle is operating or moving, the vertical vibration generated by the nano-foam fracturing fluid mixing device 1 and the nano-bubble generating device 4 on the bearing plate 7 compresses the spring 66 through the top plate 64 and triggers the piston rod extension and retraction of the damper 65 to achieve buffering and shock reduction.

[0032] Reference Figure 4 The arc-shaped contact surfaces of the lower arc plate 62 and the upper arc plate 63 contact each other to form a sliding guide structure. A guide pin 631 is fixedly connected to the outer wall of the upper arc plate 63. A guide opening 621 is provided on the lower arc plate 62, and the guide pin 631 is slidably disposed inside the guide opening 621.

[0033] In addition, when vertical vibration occurs, the arc-shaped sliding friction between the lower arc plate 62 and the upper arc plate 63 converts the vibration into heat energy dissipation, forming multi-level shock absorption protection, and the guide pin 631 slides vertically inside the guide opening 621 to achieve the guiding purpose.

[0034] Reference Figure 2 The number of buffer components 6 on the top of the sand mixing vehicle 5 is five, and they are located at the four corners and the center of the bearing plate 7 respectively.

[0035] Five buffer components 6 at the four corners and the center form a distributed support to ensure that the nano-foam fracturing fluid mixing device 1 and nano-bubble generator 4 integrated on the bearing plate 7 maintain structural stability during the movement or operation of the mixing vehicle 5.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A nano-bubble sand mixing device for reinforcing foam fracturing fluid, characterized in that: The device includes a nanofoam fracturing fluid mixing device (1) and a nanobubble generator (4) connected by an air guide pipe (3). The top of the nanofoam fracturing fluid mixing device (1) is connected to a manifold (2) for external water-based fracturing fluid. The nanofoam fracturing fluid mixing device (1) has an internal stirring structure. The axis of the air guide pipe (3) is inclined at 30°-45° to the side wall of the nanofoam fracturing fluid mixing device (1). The end of the air guide pipe (3) near the nanofoam fracturing fluid mixing device (1) is lower than the end away from the nanofoam fracturing fluid mixing device (1).

2. The nano-bubble sand mixing device for the reinforced foam fracturing fluid according to claim 1, characterized in that: The nanofoam fracturing fluid mixing device (1) has a sand inlet at the top and a sand outlet at the bottom, and a valve is provided on the outlet.

3. The nano-bubble sand mixing device for the reinforced foam fracturing fluid of claim 1, wherein: It also includes a sand mixing vehicle (5) and multiple buffer components (6) fixedly installed on the sand mixing vehicle (5). The upper ends of the buffer components (6) are all fixedly connected to a horizontally set support plate (7). The nano foam fracturing fluid sand mixing device (1) and the nano bubble generating device (4) are both fixedly installed on the top of the support plate (7).

4. The nano-bubble sand mixing device for the reinforced foam fracturing fluid of claim 3, wherein: Each of the buffer components (6) includes a base plate (61) fixedly connected to the sand mixing vehicle (5). The top of the base plate (61) is symmetrically connected to a lower arc plate (62). The inner sidewalls of the lower arc plate (62) are slidably connected to an upper arc plate (63). The top surfaces of the two upper arc plates (63) are fixedly connected to a top plate (64). A damper (65) and a spring (66) are fixedly connected between the top plate (64) and the base plate (61). The spring (66) is sleeved on the damper (65).

5. The nano-bubble sand mixing device for the reinforced foam fracturing fluid of claim 4, wherein: The arc-shaped contact surfaces of the lower arc plate (62) and the upper arc plate (63) contact each other to form a sliding guide structure. A guide pin (631) is fixedly connected to the outer wall of the upper arc plate (63). A guide opening (621) is provided on the lower arc plate (62). The guide pin (631) is slidably disposed inside the guide opening (621).

6. The nano-bubble sand mixing device for the reinforced foam fracturing fluid according to claim 3, characterized in that: The number of buffer components (6) on the top of the sand mixing vehicle (5) is five, and they are located at the four corners and the center of the bearing plate (7).

Images