Downhole multichannel blending and viscosity reduction device

Abstract

This utility model discloses a downhole multi-channel mixing and viscosity-reducing device, characterized by comprising a housing, with an upper connector and a lower connector connected to the top and bottom of the housing, respectively. A centrifugal pump is installed on the upper connector, and a motor is installed on the lower connector. A drive shaft is disposed inside the housing, with its two ends connected to the shafts of the centrifugal pump and the motor, respectively. A liquid inlet channel is opened on the side wall of the housing, and several longitudinally distributed propulsion mixing units are connected to the drive shaft. The propulsion mixing units can push and mix the heavy oil and light oil entering from the liquid inlet channel upwards. This device can reduce the viscosity of the mixed heavy oil and light oil, facilitating the lifting device to lift it to the surface, while also improving the quality of the heavy oil and increasing its economic value.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical oil production equipment, specifically to a downhole multi-channel mixing and viscosity reduction device. Background Technology

[0002] Heavy oil is characterized by high viscosity and poor fluidity, making its extraction very difficult. To bring heavy oil to the surface, its viscosity must be reduced to make it flowable. There are many methods for reducing the viscosity of heavy oil, such as heating and adding viscosity reducers. However, heating is very energy-intensive, and adding viscosity reducers can contaminate the crude oil; therefore, these methods all have their drawbacks. Currently, the method of injecting light oil into the bottom of the well through the annular space between the casing and tubing, and mixing the light oil with the heavy oil to reduce its viscosity, is being widely adopted. However, how to ensure that the heavy oil and light oil are thoroughly mixed to achieve the goal of viscosity reduction remains a problem that needs to be solved. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a downhole multi-channel mixing and viscosity-reducing device. This device can reduce the viscosity of heavy oil after mixing with light oil, making it easier for the lifting device to lift it to the surface. At the same time, it can improve the quality of heavy oil and increase its economic value.

[0004] A downhole multi-channel mixing and viscosity-reducing device includes a housing, with an upper connector and a lower connector connected to the top and bottom of the housing, respectively. A centrifugal pump is installed on the upper connector, and a motor is installed on the lower connector. A drive shaft is provided inside the housing, with its two ends connected to the shafts of the centrifugal pump and the motor, respectively. A liquid inlet channel is opened on the side wall of the housing, and a plurality of longitudinally distributed propulsion mixing units are connected to the drive shaft. The propulsion mixing units can push and mix the heavy oil and light oil entering from the liquid inlet channel upward.

[0005] Preferably, the propulsion mixing unit includes a propulsion unit and a mixing unit, with the propulsion unit located below the mixing unit.

[0006] Preferably, the propulsion unit is an axial flow impeller, which is fixedly sleeved on the drive shaft.

[0007] Preferably, the mixing unit includes a mixing wheel, which is fixedly sleeved on the drive shaft, and several stirring rods are connected to the mixing wheel.

[0008] Preferably, the plurality of stirring rods are arranged at equal angles along the circumference of the drive shaft, and the plurality of stirring rods are arranged at equal intervals along the axial direction of the drive shaft.

[0009] Preferably, a plurality of centralizing bodies are fixed inside the housing, a plurality of liquid passages are opened on the centralizing bodies, a wear-resistant bushing is provided inside the centralizing bodies, and a wear-resistant sleeve is connected to the drive shaft, and the wear-resistant bushing and the wear-resistant sleeve are rotatably connected.

[0010] Preferably, each propulsion mixing unit has a centering body on both the upper and lower sides.

[0011] Preferably, the liquid inlet channel is inclined upwards in the direction from the outside to the inside.

[0012] The beneficial effects of this utility model are as follows: In this technical solution, an upper connector and a lower connector are connected to the top of the shell. A centrifugal pump is installed on the upper connector, and a motor is installed on the lower connector. Both ends of the drive shaft are connected to the centrifugal pump and the motor, respectively. An inlet channel is provided on the shell. In actual use, the motor drives the drive shaft to rotate at high speed, and the drive shaft drives the centrifugal pump to rotate at high speed. The dispersed heavy oil and light oil enter through the inlet channel and then enter the propulsion mixing unit. In the propulsion mixing unit, the heavy oil and light oil are mixed and the viscosity is reduced. Then, the centrifugal pump drives the well fluid into the artificial lift device. In this way, this device can reduce the viscosity of the heavy oil and light oil by mixing, which is conducive to the lift device lifting it to the ground. At the same time, it can improve the quality of heavy oil and increase its economic value. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0014] Figure 1 This is a front sectional view of the present invention.

[0015] In the attached diagram, 1-upper connector, 2-centralizing body, 3-mixing unit, 4-propulsion unit, 5-shell, 6-liquid inlet channel, 7-lower connector, and 8-drive shaft. Detailed Implementation

[0016] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0017] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0018] Example 1

[0019] like Figure 1As shown, this embodiment provides a downhole multi-channel mixing and viscosity-reducing device, including a housing 5. The top and bottom ends of the housing 5 are respectively connected to an upper connector 1 and a lower connector 7. A centrifugal pump is installed on the upper connector 1, and a motor is installed on the lower connector 7. A drive shaft 8 is provided inside the housing 5. The two ends of the drive shaft 8 are respectively connected to the shafts of the centrifugal pump and the motor. A liquid inlet channel 6 is opened on the side wall of the housing 5. Several longitudinally distributed propulsion mixing units are connected to the drive shaft 8. The propulsion mixing units can push and mix the heavy oil and light oil entering from the liquid inlet channel 6 upward.

[0020] In this embodiment, an upper connector 1 and a lower connector 7 are connected to the top of the housing 5. A centrifugal pump is installed on the upper connector 1, and a motor is installed on the lower connector 7. The two ends of the drive shaft 8 are connected to the centrifugal pump and the motor, respectively. A liquid inlet channel 6 is provided on the housing 5. In actual use, the motor drives the drive shaft 8 to rotate at high speed. The dispersed heavy oil and light oil enter through the liquid inlet channel 6 and then enter the propulsion mixing unit. They are mixed in the propulsion mixing unit. After the heavy oil and light oil are mixed and the viscosity is reduced, they enter the centrifugal pump. The centrifugal pump drives the well fluid to be lifted to the ground. In this way, this device can reduce the viscosity of heavy oil and light oil by mixing, which is conducive to the lifting device lifting it to the ground. At the same time, it can improve the quality of heavy oil and increase its economic value.

[0021] In this embodiment, four propulsion mixing units are set, and each propulsion mixing unit is provided with a liquid inlet channel 6 at the position of the housing 5. In this embodiment, a liquid inlet channel is also provided on the lower connector 7.

[0022] In this embodiment, the propulsion mixing unit includes a propulsion unit 4 and a mixing unit 3, with the propulsion unit 4 located below the mixing unit 3.

[0023] In this embodiment, the propulsion unit 4 is an axial-flow impeller, which is fixedly mounted on the drive shaft 8. The axial-flow impeller propels the heavy oil and light oil upwards.

[0024] The mixing unit in this embodiment includes a mixing wheel, which is fixedly sleeved on the drive shaft 8. Several stirring rods are connected to the mixing wheel. In this embodiment, the drive shaft 8 drives the mixing wheel to rotate, which in turn drives the stirring rods to rotate. The rotation of the stirring rods mixes the heavy oil and the light oil, reducing the viscosity.

[0025] In this embodiment, several stirring rods are arranged at equal angles along the circumference of the drive shaft 8, and several stirring rods are arranged at equal intervals along the axial direction of the drive shaft 8.

[0026] In this embodiment, the stirring rod is a rectangular rod. The long side of the rectangular rod is along the circumference, and the short side is along the circumference, which provides higher strength. Arranging several stirring rods at equal angles can make the device operate more smoothly. Arranging several stirring rods at equal intervals along the axial direction allows the well fluid to be stirred multiple times when passing through the same mixing unit, which is beneficial to improving the viscosity reduction efficiency of heavy oil and light oil.

[0027] In this embodiment, a plurality of centralizing bodies 2 are fixed inside the housing 5. A plurality of liquid passages are opened on the centralizing bodies 2. Wear-resistant bushings are provided inside the centralizing bodies 2. Wear-resistant sleeves are connected to the drive shaft 8. The wear-resistant bushings and wear-resistant sleeves are rotatably connected.

[0028] In this embodiment, the centralizer 2 has a fluid passage for supplying well fluid, and the centralizer 2 serves to support and centralize the drive shaft 8. Wear-resistant bushings and sleeves are designed to prevent wear on the centralizer 2 and the drive shaft 8.

[0029] In this embodiment, each propulsion mixing unit has a centralizing body 2 on both the upper and lower sides. The centralizing body 2 on both sides of each propulsion mixing unit ensures the stability of the power transmission shaft 8's rotation.

[0030] In this embodiment, the liquid inlet channel 6 is inclined upwards from the outside to the inside. In this embodiment, the direction of the liquid inlet channel is at a 45° angle to the axis of the housing 5, which facilitates the entry of heavy oil and light oil into the propulsion mixing unit to reduce viscosity.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A downhole multi-channel mixing and viscosity-reducing device, characterized in that, The device includes a housing (5), with an upper connector (1) and a lower connector (7) connected to the top and bottom of the housing (5), respectively. A centrifugal pump is installed on the upper connector (1), and a motor is installed on the lower connector (7). A drive shaft (8) is provided inside the housing (5), with both ends of the drive shaft (8) connected to the shafts of the centrifugal pump and the motor, respectively. A liquid inlet channel (6) is opened on the side wall of the housing (5), and several longitudinally distributed propulsion mixing units are connected to the drive shaft (8). The propulsion mixing units can push and mix the heavy oil and light oil entering from the liquid inlet channel (6) upward.

2. The downhole multi-channel mixing and viscosity-reducing device according to claim 1, characterized in that, The propulsion mixing unit includes a propulsion unit (4) and a mixing unit (3), with the propulsion unit (4) located below the mixing unit (3).

3. The downhole multi-channel mixing and viscosity-reducing device according to claim 2, characterized in that, The propulsion unit (4) is an axial flow impeller, which is fixedly mounted on the transmission shaft (8).

4. The downhole multi-channel mixing and viscosity-reducing device according to claim 2, characterized in that, The mixing unit includes a mixing wheel, which is fixedly sleeved on the drive shaft (8), and several stirring rods are connected to the mixing wheel.

5. The downhole multi-channel mixing and viscosity-reducing device according to claim 4, characterized in that, The stirring rods are arranged at equal angles along the circumference of the drive shaft (8) and at equal intervals along the axial direction of the drive shaft (8).

6. The downhole multi-channel mixing and viscosity-reducing device according to claim 1, characterized in that, The housing (5) has several centralizing bodies (2) fixed inside. Several liquid passages are opened on the centralizing bodies (2). Wear-resistant bushings are provided inside the centralizing bodies (2). Wear-resistant sleeves are connected to the drive shaft (8). The wear-resistant bushings and wear-resistant sleeves are rotatably connected.

7. The downhole multi-channel mixing and viscosity-reducing device according to claim 6, characterized in that, Each propulsion mixing unit has a centralizing body on both the top and bottom sides (2).

8. The downhole multi-channel mixing and viscosity-reducing device according to claim 1, characterized in that, The liquid inlet channel (6) is inclined upwards in the direction from the outside to the inside.

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