A micro-nano bubble generating device for oilfield well injection

Abstract

The utility model discloses a kind of micro-nano bubble generating device for oilfield injection well, including infusion tube, the one end of infusion tube is provided with liquid inlet;Gas-liquid mixing structure is provided at the elbow pipe of infusion tube;The bottom end of infusion tube is fixedly connected with cylinder, the inner wall of cylinder is fixedly connected with spiral plate;The filter core is provided below the cylinder;Gas-liquid mixing structure includes the air inlet and air outlet of symmetric fixed connection in the circumference outer wall of infusion tube, the gas pipe fixedly connected in the circumference inner wall of infusion tube, and the both ends of gas pipe are fixedly connected with air inlet and air outlet respectively;The circumference outer wall of both sides where gas pipe is located is provided with air hole.The utility model forms micro-nano bubble by gas-liquid mixing structure, spiral plate and filter core multiple cooperation, by injecting micro-nano bubble water into oil and gas field, to reduce crude oil viscosity, increase crude oil fluidity, to improve oil recovery rate.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development technology, and in particular to a micro-nano bubble generator for oilfield injection. Background Technology

[0002] After a period of time, the internal pressure of an oil and gas field decreases, making it difficult to continue producing natural gas and oil through spontaneous flow. Injecting micro-nano bubble water downhole can dissolve in the crude oil, increasing its gas saturation and reducing its viscosity, thereby improving oil recovery. Simultaneously, the micro-nano bubble water can adsorb at the oil-water interface, reducing interfacial tension and making it easier for crude oil to flow out from rock pores.

[0003] In traditional gas injection oil displacement technology, the large bubble size (millimeter scale) makes them prone to coalescence and collapse in the reservoir, leading to gas channeling and low oil displacement efficiency. Based on this, we propose a micro / nano bubble generator for oilfield injection. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a micro / nano bubble generator for oilfield injection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A micro / nano bubble generator for oilfield injection includes a delivery pipe with an inlet at one end; a gas-liquid mixing structure at the bend of the delivery pipe; a cylinder fixedly connected to the bottom end of the delivery pipe, with a spiral plate fixedly connected to the inner wall of the cylinder; and a filter element located below the cylinder.

[0007] As a further embodiment of this utility model: the gas-liquid mixing structure includes an air inlet and an air outlet that are symmetrically and fixedly connected to the outer circumference of the infusion tube, and an air delivery pipe that is fixedly connected to the inner circumference of the infusion tube, with the two ends of the air delivery pipe being fixedly connected to the air inlet and the air outlet, respectively.

[0008] As a further improvement of this utility model, the gas delivery pipe has air holes on the outer circumference of both sides.

[0009] As a further improvement of this utility model, a bucket-shaped channel is fixedly connected to the bottom end of the cylinder.

[0010] As a further improvement of this utility model: the bottom end of the channel is fixedly connected to a liquid outlet head, and the outer circumferential wall of the filter element is fixedly connected to the bottom end of the liquid outlet head.

[0011] As a further embodiment of this utility model: the inner circumferential wall of the infusion tube is provided with a self-regulating pressure component, which includes a groove disposed on the inner circumferential wall of the infusion tube, a movable block slidably connected to the inner wall of the groove, an elastic element fixedly connected to one side of the groove and the movable block, a folding cover fixedly connected to one side of the groove and the movable block, and a funnel-shaped structure disposed on one side of the movable block, wherein the elastic element is located between the folding cover and the groove.

[0012] As a further improvement of this utility model: the funnel-shaped structure is composed of an integral neck and a flared opening, wherein the flared opening faces the liquid inlet.

[0013] Compared with the prior art, this utility model provides a micro-nano bubble generator for oilfield injection, which has the following beneficial effects:

[0014] 1. This micro-nano bubble generator for oilfield injection incorporates a gas-liquid mixing structure, a spiral plate, and a filter element. Liquid is introduced into the delivery pipe from the liquid inlet, while gas is simultaneously injected into the gas delivery pipe from the gas inlet. Through the combined action of the gas-liquid mixing structure, the spiral plate, and the filter element, micro-nano bubbles are formed. By injecting micro-nano bubble water into the oil and gas field, the viscosity of crude oil is reduced, the fluidity of crude oil is increased, and thus the oil recovery rate is improved.

[0015] 2. This micro-nano bubble generator for oilfield injection involves injecting liquid into the delivery pipe through the inlet and simultaneously injecting gas into the delivery pipe through the inlet. The gas is released through several pores on the delivery pipe and mixes with the liquid outside the pipe, thus forming microbubbles. After the gas and liquid mix, they enter the cylinder and flow along the spiral plate, forcing the fluid to move tangentially to form a vortex. Through turbulent shearing, large bubbles are cut into smaller bubbles, achieving secondary bubble formation. The bubble liquid flows slowly through the funnel-shaped channel and enters the outlet head. After passing through the filter element, it is ejected, further subdividing the bubbles, so that qualified micro-nano bubbles are uniformly ejected from the outlet head for use.

[0016] 3. This micro-nano bubble generator for oilfield injection gradually increases the speed of the liquid as it enters the neck through the flared end. The pressure decreases as the liquid moves away from the neck, and the flow rate becomes uniform. Conversely, when the liquid flow rate is high, the liquid that cannot rush into the neck will push the moving block backward, expanding its front-end space and improving safety. According to Bernoulli's equation in fluid mechanics, it plays a role in stabilizing pressure fluctuations under complex flow conditions and can prevent pressure oscillations in the entire pipeline. Attached Figure Description

[0017] Figure 1 This is a partial side view cross-sectional structural diagram of a micro / nano bubble generator for oilfield injection proposed in this utility model.

[0018] Figure 2This is a bottom view of the structure of a micro / nano bubble generator for oilfield injection proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the delivery pipe of a micro / nano bubble generator for oilfield injection proposed in this utility model.

[0020] Figure 4 This is a schematic diagram of the movable block structure of a micro / nano bubble generator for oilfield injection proposed in this utility model;

[0021] Figure 5 This is a schematic diagram of the gas pipeline structure of a micro / nano bubble generator for oilfield injection proposed in this utility model.

[0022] In the diagram: 1 infusion tube, 101 inlet, 2 air inlet, 201 air outlet, 202 air supply tube, 203 air hole, 3 cylinder, 4 channel, 5 outlet head, 501 filter element, 6 spiral plate, 7 slide groove, 701 elastic element, 702 movable block, 7021 flared opening, 7022 neck opening, 703 folded cover. 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] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Example 1: A micro / nano bubble generator for oilfield injection, such as Figure 1-2 and Figure 5 As shown, it includes an infusion tube 1, one end of which is provided with an inlet 101; a gas-liquid mixing structure is provided at the bend of the infusion tube 1, the gas-liquid mixing structure includes an air inlet 2 and an air outlet 201 symmetrically welded to the outer circumference of the infusion tube 1, and an air supply pipe 202 welded to the inner circumference of the infusion tube 1, and the two ends of the air supply pipe 202 are fixedly connected to the air inlet 2 and the air outlet 201 respectively.

[0026] Preferably, the gas delivery pipe 202 has several air holes 203 on its outer circumferential walls on both sides; liquid is input into the liquid delivery pipe 1 from the liquid inlet 101, and gas is injected into the gas delivery pipe 202 from the air inlet 2 at the same time. The gas is released through the several air holes 203 on the gas delivery pipe 202 and mixes with the liquid outside the pipe to form micro bubbles.

[0027] Furthermore, a cylinder 3 is welded to the bottom end of the infusion tube 1, and a spiral plate 6 is welded to the inner wall of the cylinder 3; after the gas and liquid are mixed, they enter the cylinder 3 and flow along the spiral plate 6, forcing the fluid to move tangentially to form a vortex, and through turbulent shearing, large bubbles are cut into small bubbles, thereby realizing the secondary formation of bubbles.

[0028] Furthermore, the bottom end of the cylinder 3 is fixed with a funnel-shaped channel 4 by bolts, the bottom end of the channel 4 is fixed with a liquid outlet head 5 by bolts, and the bottom end of the liquid outlet head 5 is fixed with a micro-nano filter element 501 by bolts; the bubble liquid enters the liquid outlet head 5 after flowing slowly through the funnel-shaped channel 4, passes through the filter element 501 and is ejected, further subdividing the bubbles, so that the qualified micro-nano bubbles are evenly ejected from the liquid outlet head 5 for use.

[0029] Working principle: Liquid is input into the inlet pipe 1 through the inlet 101, while gas is injected into the gas inlet 202 through the outlet 2. The gas is released through several pores 203 on the gas inlet 202 and mixes with the liquid outside the pipe, thus forming microbubbles. After the gas and liquid mix, it enters the cylinder 3 and flows along the spiral plate 6, forcing the fluid to move tangentially to form a vortex. Through turbulent shearing, large bubbles are cut into smaller bubbles, achieving secondary bubble formation. The bubble liquid flows slowly through the funnel-shaped channel 4 and enters the outlet head 5. After passing through the filter element 501, it is ejected, further subdividing the bubbles, so that qualified micro-nano bubbles are uniformly ejected from the outlet head 5 for use.

[0030] Example 2: A micro / nano bubble generator for oilfield injection, such as Figure 3-4 As shown, in order to improve the safety of use, this embodiment makes the following improvements based on embodiment 1: The inner circumferential wall of the infusion tube 1 is provided with a self-adjusting pressure component. The self-adjusting pressure component includes a groove 7 opened on the inner circumferential wall of the infusion tube 1, a movable block 702 slidably connected to the inner wall of the groove 7, an elastic element 701 welded to the groove 7 and the movable block 702 on opposite sides, a folding cover 703 welded to the groove 7 and the movable block 702 on opposite sides, and a funnel-shaped structure opened on one side of the movable block 702. The elastic element 701 is located between the folding cover 703 and the groove 7.

[0031] Preferably, the elastic element 701 can be a spring or the like;

[0032] Furthermore, the funnel-shaped structure consists of an integral neck 7022 and a flared end 7021, with the flared end 7021 facing the inlet 101. After the liquid enters the infusion pipe 1 through the inlet 101, it flows into the movable block 702 to automatically regulate the water pressure. Specifically, the liquid gradually increases in speed as it enters the neck 7022 through the flared end 7021, and the pressure decreases as it moves away from the neck 7022, resulting in a uniform flow rate. Conversely, when the liquid flow rate is high, the liquid that cannot flow into the neck 7022 in time will push the movable block 702 backward, expanding its front-end space and improving safety. According to Bernoulli's equation in fluid mechanics, this structure plays a role in stabilizing pressure fluctuations under complex flow conditions and can prevent pressure oscillations in the entire pipeline.

[0033] Working principle: After liquid is input into the infusion pipe 1 through the inlet 101, it flows into the movable block 702 to automatically regulate the water pressure. At the same time, gas is injected into the gas infusion pipe 202 through the air inlet 2. The gas is released through several air holes 203 on the gas infusion pipe 202 and mixes with the liquid outside the pipe, thereby forming microbubbles. After the gas and liquid mix, it enters the cylinder 3 and flows along the spiral plate 6, forcing the fluid to move tangentially to form a vortex. Through turbulent shearing, large bubbles are cut into small bubbles, realizing the secondary formation of bubbles. The bubble liquid flows slowly through the funnel-shaped channel 4 and enters the outlet head 5. After passing through the filter element 501, it is ejected, further subdividing the bubbles, so that the qualified micro-nano bubbles are uniformly ejected from the outlet head 5 for use.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A micro / nano bubble generator for oilfield injection, comprising a delivery pipe (1), characterized in that, One end of the infusion tube (1) is provided with an inlet (101); a gas-liquid mixing structure is provided at the bend of the infusion tube (1); a cylinder (3) is fixedly connected to the bottom end of the infusion tube (1), and a spiral plate (6) is fixedly connected to the inner wall of the cylinder (3); a filter element (501) is provided below the cylinder (3).

2. The micro / nano bubble generator for oilfield injection according to claim 1, characterized in that, The gas-liquid mixing structure includes an air inlet (2) and an air outlet (201) that are symmetrically fixed to the outer circumference of the infusion pipe (1), and an air delivery pipe (202) that is fixed to the inner circumference of the infusion pipe (1). The two ends of the air delivery pipe (202) are fixedly connected to the air inlet (2) and the air outlet (201) respectively.

3. The micro / nano bubble generator for oilfield injection according to claim 2, characterized in that, The gas delivery pipe (202) has air holes (203) on its outer circumferential walls on both sides.

4. The micro / nano bubble generator for oilfield injection according to claim 3, characterized in that, The bottom end of the cylinder (3) is fixedly connected to a bucket-shaped channel (4).

5. A micro / nano bubble generator for oilfield injection according to claim 4, characterized in that, The bottom end of the channel (4) is fixedly connected to the liquid outlet head (5), and the outer circumferential wall of the filter element (501) is fixedly connected to the bottom end of the liquid outlet head (5).

6. The micro / nano bubble generator for oilfield injection according to claim 1, characterized in that, The inner circumferential wall of the infusion tube (1) is provided with a self-regulating pressure component. The self-regulating pressure component includes a groove (7) provided on the inner circumferential wall of the infusion tube (1), a movable block (702) slidably connected to the inner wall of the groove (7), an elastic element (701) fixedly connected to the corresponding side of the groove (7) and the movable block (702), a folding cover (703) fixedly connected to the corresponding side of the groove (7) and the movable block (702), and a funnel-shaped structure provided on one side of the movable block (702). The elastic element (701) is located between the folding cover (703) and the groove (7).

7. A micro / nano bubble generator for oilfield injection according to claim 6, characterized in that, The funnel-shaped structure consists of an integral neck (7022) and a flared opening (7021), wherein the flared opening (7021) faces the liquid inlet (101).

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