Self-circulation profile control and flooding injection device

Abstract

The utility model relates to a kind of self-circulation profile control and driving injection device, including outer cylinder shell;Still including the helical flow guide rib of being set in the axial extension of outer cylinder shell inner wall, the upper end surface of outer cylinder shell is equipped with motor, the output end of motor is connected with rotating shaft, rotating shaft is set at outer cylinder shell inner cavity center, the lower end of rotating shaft is fixedly installed with impeller, impeller is located in the flow passage region surrounded by helical flow guide rib, the outlet end of outer cylinder shell is equipped with orifice plate, multiple throttle holes are set on orifice plate;The novel adoption tangential liquid inlet and same direction rotating impeller synergism, generate strong vortex, and make medicament on-line dilution by orifice plate high shear, viscosity instantaneous reduction, effectively relieve injection resistance and inhibit microspherule aggregation, enhance deep plugging capacity;Device integrates mixing, dispersion and activation, without curing tank, can be directly connected into main flow, combined with replaceable orifice plate and cooling jacket, realize flexible adaptation and plug and play, reduce footprint.

Description

Technical Field

[0001] This utility model relates to the technical field of fluid processing equipment for oil extraction, specifically a self-circulating profile control and drive injection device. Background Technology

[0002] Self-circulating profile control and displacement injection devices are integrated downhole or surface injection equipment that can automatically circulate and inject profile control / displacement agents (such as polymers, gels, foams, microspheres, etc.) into specific layers of the reservoir. This achieves the blocking of high-permeability channels and the displacement of low-permeability areas, thereby improving the sweep efficiency of water or gas injection. Profile control: Adjusts the water absorption profile of the injection well, blocks high-permeability channels, and directs the injected fluid to unused or low-permeability areas. Displacement: Based on profile control, further injects oil displacement agents (such as surfactants, polymers, etc.) to improve crude oil displacement efficiency. Improved water / gas injection profile: Solves the "finding" or "cross-flow" problem caused by reservoir heterogeneity. Improved sweep efficiency and oil displacement efficiency: Allows the injected fluid to advance more evenly and contact more crude oil. Reduced ineffective circulation: Reduces ineffective flow of water or gas in high-permeability layers, saving resources.

[0003] In existing profile control and flooding operations, common self-circulating injection devices generally suffer from poor adaptability to high-viscosity agents, resulting in limited field application effectiveness. Specifically, profile control agents such as polymer solutions (e.g., polyacrylamide) or nanosphere suspensions typically have high initial viscosity to ensure good plugging and retention performance in the formation. However, this high viscosity becomes an obstacle during the surface injection stage: on the one hand, the flow resistance of the agent increases significantly when flowing through pipes, valves, and injection equipment, requiring higher pumping pressure, which not only increases energy consumption but also easily exceeds the pressure limit of the equipment; on the other hand, due to the lack of effective online activation methods, the agent fails to achieve controllable "shear thinning" before entering the formation, making it difficult for it to effectively penetrate low-permeability or deep high-permeability channels. In addition, microsphere profile control agents are prone to agglomeration, sedimentation or adsorption aggregation under static or low shear conditions, especially forming blockages at bends, diameter changes or dead zones, causing abnormal increases in injection pressure or even interruption of construction. Although some traditional devices are equipped with mixing tanks or static mixers, their structures are simple and cannot form a high-intensity and uniform shear field. The agent is not sufficiently dispersed and the microspheres are unevenly distributed, which further aggravates the heterogeneous blockage phenomenon. The reason for this is that existing injection devices generally lack an online activation structure that integrates strong eddy mixing and instantaneous high shear, and cannot achieve controllable dilution of the agent without relying on a curing tank. The aforementioned problems collectively lead to the inability of the agent to effectively migrate to the target deep region, resulting in an actual affected volume far lower than the design expectation, a significant decrease in plugging efficiency, and ultimately affecting the overall oil enhancement effect and economic benefits of profile control and displacement. Therefore, there is an urgent need for a new type of injection device that can achieve online and efficient activation of high-viscosity agents, prevent microsphere aggregation, and be compatible with different agent systems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a self-circulating, profile-adjusting, and drive-adjusting injection device. The tangential inlet and the co-directional impeller work together to form a strong vortex. The high shear of the orifice plate temporarily reduces the viscosity of the agent by more than 30%. It integrates an activation function, eliminates the need for a curing tank, and saves more than 15% in land, investment, and electricity. It solves the problems of common devices that are difficult to handle high-viscosity agents, easily cause microsphere agglomeration and blockage, and have difficulty in injection due to insufficient shear, small affected volume, and low sealing efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-circulating profile-adjusting and driving injection device, comprising an outer cylinder shell; further comprising a spiral guide rib extending axially along the inner wall of the outer cylinder shell, a motor mounted on the upper end face of the outer cylinder shell, the output end of the motor connected to a rotating shaft, the rotating shaft being located at the center of the inner cavity of the outer cylinder shell, an impeller fixedly mounted on the lower end of the rotating shaft, the impeller being located within the flow channel area enclosed by the spiral guide rib, an orifice plate mounted on the outlet end of the outer cylinder shell, the orifice plate having multiple throttling holes for forming a high-shear zone when the agent flows out, an inlet pipe provided on the end cap of the outer cylinder shell, the inlet pipe being inclinedly connected along the tangential direction of the inner wall of the outer cylinder shell, and its outlet being directly opposite the starting section of the spiral guide rib, for guiding the agent to form a circumferential flow along the spiral guide rib.

[0006] Furthermore, there are 3 spiral guide ribs, with a rib height of 5 mm and a pitch of 100 mm, and the spiral direction of the spiral guide ribs is consistent with the rotation direction of the impeller.

[0007] Furthermore, the impeller has a swept-back multi-blade structure with 6 blades, and the blade inclination angle is 30 to 60 degrees. The gap between the outer edge of the impeller and the inner wall of the spiral guide rib does not exceed 2 millimeters.

[0008] Furthermore, the throttling orifice is a ring array of multiple micropores, with the diameter of a single throttling orifice ranging from 1 to 8 millimeters. The orifice plate is a detachable structure, and the shear strength can be adjusted by replacing orifice plates with different orifice diameters or numbers of orifices.

[0009] Furthermore, the rotating shaft is supported on the upper and lower end covers of the outer cylinder shell by upper and lower magnetic seal bearings, respectively. The motor is installed on the upper end face of the outer cylinder shell, and its output shaft is connected to the upper end of the rotating shaft by a coupling.

[0010] Furthermore, the outer shell is made of corrosion-resistant stainless steel with an inner surface roughness Ra of no more than 0.8 micrometers. The outer wall of the outer shell is provided with a jacket layer, and the surface of the jacket layer is provided with an interface pipe. The interface pipe is used to introduce and discharge cooling medium to control the temperature rise during the shearing process.

[0011] Furthermore, both the inlet pipe and the outlet end of the outer shell are equipped with flange interfaces. The flange interfaces are used to connect in series to the main process of profile control and drive injection. A pressure sensor is integrated on the inlet pipe, and a temperature sensor is installed on the shell wall of the outer shell near the orifice plate. The pressure sensor and temperature sensor are used to monitor the fluid state parameters of the activation process.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects: 1. The agent is guided by a tangential inlet to form a circumferential flow along the spiral guide ribs, and a strong three-dimensional vortex field is generated by the co-rotating central impeller. Then, it undergoes instantaneous high shear treatment through the orifice plate throttling holes, so that the polymer solution or nanosphere suspension is sheared, thinned and activated before injection. The apparent viscosity of the agent is temporarily reduced by more than 30%, which effectively solves the problems of difficult injection of high-viscosity agents and microsphere agglomeration and blockage. After entering the formation, the viscosity is automatically restored, thereby improving the deep plugging efficiency and swept volume. 2. It integrates mixing, dispersion, shearing and activation functions into one unit, eliminating the need for additional ground maturation tanks and mixing equipment. It can be directly connected in series with the main injection process. At the same time, it adopts a detachable orifice plate to adapt to different reagent systems, and with the help of a cooling jacket for temperature control, it can achieve plug-and-play and intelligent control, which can significantly save on-site space, reduce equipment investment, and reduce the overall energy consumption of the system by more than 15%. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below; Figure 3 This is a cross-sectional three-dimensional structural diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the impeller location of this utility model; Figure 5 This is an enlarged three-dimensional structural diagram of the location of the pressure sensor of this utility model.

[0014] In the figure: 1. Outer shell; 2. Spiral guide rib; 3. Motor; 4. Rotating shaft; 5. Impeller; 6. Orifice plate; 7. Throttling orifice; 8. Jacket layer; 9. Interface pipe; 10. Inlet pipe; 11. Pressure sensor; 12. Temperature sensor. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1-5 This embodiment of a self-circulating profile-adjusting and driving injection device includes an outer cylinder shell 1; it also includes a spiral guide rib 2 extending axially along the inner wall of the outer cylinder shell 1. A motor 3 is installed on the upper end face of the outer cylinder shell 1, and the output end of the motor 3 is connected to a rotating shaft 4. The rotating shaft 4 is located at the center of the inner cavity of the outer cylinder shell 1, and an impeller 5 is fixedly installed at the lower end of the rotating shaft 4. The impeller 5 is located in the flow channel area enclosed by the spiral guide rib 2. An orifice plate 6 is installed at the outlet end of the outer cylinder shell 1. Multiple throttling holes 7 are opened on the orifice plate 6 to form a high shear zone when the agent flows out. An inlet pipe 10 is provided on the end cap of the outer cylinder shell 1. The inlet pipe 10 is inclined along the tangent direction of the inner wall of the outer cylinder shell 1, and its outlet is directly opposite the starting section of the spiral guide rib 2 to guide the agent to form a circumferential flow along the spiral guide rib 2.

[0017] In this embodiment, a strong vortex is formed by the tangential inlet and the co-rotating impeller 5, and the agent is thinned online by high shear through the orifice plate 6, temporarily reducing the viscosity by more than 30%, solving the problems of difficult injection and microsphere agglomeration, and improving the deep sealing effect. At the same time, the mixing, dispersion and activation functions are integrated, eliminating the need for a curing tank, and can be directly connected to the main process. With the replaceable orifice plate 6 and cooling jacket, it can be plug-and-play, saving more than 15% of space, investment and energy consumption.

[0018] It should be noted that the rotating shaft 4 is supported at the upper and lower end covers of the outer cylinder shell 1 by upper and lower magnetic seal bearings, respectively. The motor 3 is installed on the upper end face of the outer cylinder shell 1, and its output shaft is connected to the upper end of the rotating shaft 4 via a coupling. The outer cylinder shell 1 is made of corrosion-resistant stainless steel, and the inner surface roughness Ra is no greater than 0.8 micrometers. The outer wall of the outer cylinder shell 1 is provided with a jacket layer 8, and the surface of the jacket layer 8 is provided with an interface pipe 9. The interface pipe 9 is used to introduce and discharge cooling medium to control the temperature rise during the shearing process. The rotating shaft 4 is supported by upper and lower magnetic seal bearings. This achieves leak-free rotary transmission, effectively isolating high-pressure agents from the external environment and improving sealing reliability. The motor 3 drives the rotating shaft 4 through a coupling, providing a stable and adjustable speed to ensure controllable eddy current field strength. The outer shell 1 is made of corrosion-resistant stainless steel with an inner surface roughness Ra of no more than 0.8 micrometers, reducing agent adhesion and deposition on the wall and ensuring long-term operational stability. The outer shell 1 has a jacket layer 8 on its outer wall, and the interface pipe 9 on the jacket layer 8 is used to introduce and discharge cooling medium to remove the heat generated during shearing, control the temperature rise, prevent polymer thermal degradation, and maintain stable agent performance.

[0019] Please see Figures 1-5 In this embodiment, in order to temporarily reduce viscosity, facilitate injection, and automatically thicken after entering the formation to effectively seal deep areas, the number of spiral guide ribs 2 in this embodiment is 3, the rib height is 5 mm, the pitch is 100 mm, and the spiral guide ribs 2 have the same rotation direction as the impeller 5. The impeller 5 has a swept-back multi-blade structure with 6 blades and a blade inclination angle of 30 degrees to 60 degrees. The gap between the outer edge of the impeller 5 and the inner wall of the spiral guide ribs 2 does not exceed 2 mm. The throttling orifice 7 is a ring array of multiple micropores, and the diameter of a single throttling orifice 7 is 1 to 8 mm. The orifice plate 6 has a detachable structure, and the shear strength can be adjusted by replacing the orifice plate 6 with different diameters or numbers of orifices.

[0020] In this embodiment, there are 3 spiral guide ribs 2, each with a height of 5 mm and a pitch of 100 mm. The spiral direction is consistent with the rotation direction of the impeller 5, which can guide the agent to form a stable circumferential flow and enhance the vortex intensity. The impeller 5 adopts a swept-back multi-blade structure with 6 blades and an inclination angle of 30 to 60 degrees, which effectively improves the shear dispersion efficiency and reduces energy consumption. The gap between the outer edge of the impeller 5 and the inner wall of the spiral guide rib 2 does not exceed 2 mm, which strengthens fluid disturbance and avoids dead zones. The throttling orifice 7 adopts a ring array of multiple micropores with a single orifice diameter of 1 to 8 mm, which can form a high shear zone at the outlet, temporarily reducing the viscosity of the polymer or microsphere suspension, making it easier to inject. After entering the formation, the viscosity is automatically restored, achieving effective deep sealing. The orifice plate 6 is a detachable structure. By replacing the orifice plate 6 with different orifice diameters or numbers of orifices, the shear intensity can be flexibly adjusted to adapt to a variety of profile control agents.

[0021] It should be noted that both the inlet pipe 10 and the outlet end of the outer shell 1 are provided with flange interfaces. The flange interfaces are used to connect in series to the main process of profile adjustment and drive injection. The pressure sensor 11 is integrated on the inlet pipe 10, and the temperature sensor 12 is installed on the shell wall of the outer shell 1 and near the orifice plate 6. The pressure sensor 11 and the temperature sensor 12 are used to monitor the fluid state parameters of the activation process.

[0022] The working principle of the above embodiments is as follows: In use, the reagent enters through the inlet pipe 10, which is inclined along the tangential direction of the inner wall of the outer cylinder shell 1, allowing the reagent to initially flow along the wall. Subsequently, guided by the spiral guide rib 2, a stable circumferential spiral flow is formed. Simultaneously, the motor 3 drives the rotating shaft 4 to drive the impeller 5 to rotate at high speed. The rotation direction of the impeller 5 is consistent with that of the spiral guide rib 2. The two work together to generate a strong three-dimensional vortex field in the flow channel, which fully mixes and initially shears and disperses the reagent. After the reagent continues to flow downward through the impeller 5 area, it reaches the orifice plate 6 at the outlet end. The multiple throttling holes 7 on the orifice plate 6 form an instantaneous high-shear region, causing shear thinning of the polymer solution or microsphere suspension, temporarily reducing the apparent viscosity by more than 30%, thus facilitating injection into the formation. After entering the formation... Shearing disappears, and the agent viscosity automatically recovers, effectively sealing deep high-permeability channels. Throughout the process, the jacket layer 8 is circulated with cooling medium through the interface pipe 9 to promptly remove the heat generated by shearing, control the temperature rise, prevent thermal degradation of the agent, and ensure stable performance. The rotating shaft 4 is supported by upper and lower magnetic seal bearings to achieve leak-free transmission and ensure that the high-pressure agent does not leak out. The flange interface at the inlet pipe 10 and the outlet end facilitates quick connection to the main injection process. The pressure sensor 11 on the inlet pipe 10 and the temperature sensor 12 of the adjacent orifice plate 6 monitor the fluid state parameters in real time, providing a basis for operation control. The orifice plate 6 adopts a detachable design, and by replacing the orifice plate 6 with different orifice diameters or numbers, it can flexibly adapt to various profile control and displacement agents to meet the needs of different working conditions.

[0023] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the field. Furthermore, this utility model is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-circulating profile-adjusting and driving injection device, comprising an outer cylinder shell (1); characterized in that: It also includes a spiral guide rib (2) that extends axially along the inner wall of the outer shell (1). A motor (3) is installed on the upper end face of the outer shell (1). The output end of the motor (3) is connected to a rotating shaft (4). The rotating shaft (4) is located at the center of the inner cavity of the outer shell (1). An impeller (5) is fixedly installed at the lower end of the rotating shaft (4). The impeller (5) is located in the flow channel area enclosed by the spiral guide rib (2). An orifice plate (6) is installed at the outlet end of the outer shell (1). Multiple throttling holes (7) are opened on the orifice plate (6) to form a high shear zone when the drug flows out. An inlet pipe (10) is provided on the end cap of the outer shell (1). The inlet pipe (10) is inclined to the inner wall of the outer shell (1) along the tangent direction, and its outlet is directly opposite the starting section of the spiral guide rib (2) to guide the drug to form a circumferential flow along the spiral guide rib (2).

2. The self-circulating profile control and driving injection device according to claim 1, characterized in that: There are 3 spiral guide ribs (2), with a rib height of 5 mm and a pitch of 100 mm. The spiral guide ribs (2) have the same rotation direction as the impeller (5).

3. The self-circulating profile control and driving injection device according to claim 1, characterized in that: The impeller (5) is a swept-back multi-blade structure with 6 blades. The blade inclination angle is 30 to 60 degrees. The gap between the outer edge of the impeller (5) and the inner wall of the spiral guide rib (2) does not exceed 2 mm.

4. The self-circulating profile control and driving injection device according to claim 1, characterized in that: The throttling orifice (7) is a ring array of multiple micropores. The diameter of a single throttling orifice (7) is 1 to 8 mm. The orifice plate (6) is a detachable structure. The shear strength can be adjusted by replacing the orifice plate (6) with different diameters or numbers of orifices.

5. The self-circulating profile control and driving injection device according to claim 1, characterized in that: The rotating shaft (4) is supported on the upper and lower end covers of the outer cylinder shell (1) by the upper magnetic seal bearing and the lower magnetic seal bearing respectively. The motor (3) is installed on the upper end face of the outer cylinder shell (1), and its output shaft is connected to the upper end of the rotating shaft (4) through a coupling.

6. The self-circulating profile control and driving injection device according to claim 1, characterized in that: The outer shell (1) is made of corrosion-resistant stainless steel with an inner surface roughness Ra of no more than 0.8 micrometers. The outer wall of the outer shell (1) is provided with a jacket layer (8). The surface of the jacket layer (8) is provided with an interface pipe (9). The interface pipe (9) is used to introduce and discharge cooling medium to control the temperature rise during the shearing process.

7. The self-circulating profile control and driving injection device according to claim 1, characterized in that: Both the inlet pipe (10) and the outlet of the outer shell (1) are provided with flange interfaces. The flange interfaces are used to connect in series to the main process of profile adjustment and drive injection. The pressure sensor (11) is integrated on the inlet pipe (10). The temperature sensor (12) is installed on the shell wall of the outer shell (1) and near the orifice plate (6). The pressure sensor (11) and the temperature sensor (12) are used to monitor the fluid state parameters of the activation process.

Images