Two-stage integrated sand separator

Abstract

This utility model discloses a two-stage integrated sand remover, comprising a main shell with a hollow channel and an air inlet and outlet on its side. A filter cartridge is positioned at the upper part of the hollow channel, and an axial-flow hydrocyclone is positioned at the lower part. A cyclone inlet chamber, connected to the air inlet, is located at the lower part of the hollow channel of the main shell. A cyclone outer cylinder is fixedly connected to the lower end of the cyclone inlet chamber with a reduced diameter. The axial-flow hydrocyclone is positioned inside the cyclone outer cylinder and has several swirl vanes on its outer circumference. An anti-winding seat is positioned directly below the axial-flow hydrocyclone at the bottom of the cyclone outer cylinder. A through-hole in the middle of the axial-flow hydrocyclone extends upward through a first seamless steel pipe into the inner hole of the filter cartridge, with the horizontal position of the outlet of the first seamless steel pipe higher than the horizontal position of the air outlet. This utility model reduces production costs and floor space, improves sand removal efficiency and effect, and reduces the frequency of filter cartridge maintenance by on-site personnel.

Description

Technical Field

[0001] This utility model relates to a two-stage integrated sand remover, specifically applied to a two-stage integrated sand remover in the natural gas extraction process, belonging to the field of natural gas extraction and transportation technology. Background Technology

[0002] In the early stages of natural gas extraction, especially during the fracturing process used in conventional natural gas extraction, the imported natural gas from the wellhead carries a large amount of particulate matter, and the pressure and gas flow rate are relatively high. Generally, a desander device is installed to separate the impurities in the gas into solid and gas. However, the existing gas well pipeline desanders are not very effective in normal operation. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this utility model proposes a two-stage integrated sand separator that integrates the functions of a traditional cyclone sand separator and a cartridge sand separator into one unit, reducing production costs and floor space requirements, improving sand removal efficiency, and reducing the frequency of on-site maintenance of the cartridge.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a two-stage integrated sand remover, comprising a main shell with a hollow channel and an air inlet and an air outlet on its side. A filter cartridge is positioned at the upper part of the hollow channel, and an axial flow cyclone separator is positioned at the lower part. A cyclone inlet chamber connected to the air inlet is positioned at the lower part of the hollow channel of the main shell. A cyclone outer cylinder is fixedly connected to the lower end of the cyclone inlet chamber with a reduced diameter. The axial flow cyclone separator is positioned inside the cyclone outer cylinder. The axial flow cyclone separator has several cyclone vanes on its outer periphery, and an anti-winding seat is provided directly below the axial flow cyclone separator. The anti-winding seat is located at the bottom of the cyclone outer cylinder. The through hole in the middle of the axial flow cyclone separator extends upward through a first seamless steel pipe into the inner hole of the filter cartridge, and the horizontal position of the outlet of the first seamless steel pipe is higher than the horizontal position of the air outlet.

[0005] Furthermore, the cyclone inlet chamber is a second seamless steel tube arranged on the same central axis as the axial flow cyclone. The second seamless steel tube is sleeved on the axial flow cyclone and the first seamless steel tube, and the upper end of the second seamless steel tube is fixedly connected to the first seamless steel tube through the cyclone sealing plate, and the lower end is sleeved on the upper end of the cyclone outer cylinder and fixedly connected to it; the air inlet is connected to the second seamless steel tube through the air inlet pipe, and the central axis of the air inlet and the air inlet pipe is perpendicular to the central axis of the second seamless steel tube.

[0006] Furthermore, the lower end of the main shell is connected to a lower cylinder via a first threaded flange, and a lower flange cover is provided at the bottom of the lower cylinder; the outer periphery of the swirling outer cylinder is positioned on the inner wall of the lower cylinder via a swirling element positioning block.

[0007] Furthermore, the upper end of the main housing is connected to an upper cylinder via a second threaded flange, and a pressure cap is provided on the top of the upper cylinder; the bottom of the filter cartridge is positioned on the inner wall ring platform of the main housing via a filter cartridge base, and the pressure cap presses and positions the filter cartridge on the filter cartridge base through a sealing cap.

[0008] Furthermore, a lifting eye screw is provided on the top of the sealing cover, and the lifting eye screw is located outside the pressure cover.

[0009] Furthermore, pressure cap handles are provided on both sides of the pressure cap.

[0010] Furthermore, the filter cartridge has a filtration accuracy of 50μm to 800μm.

[0011] Furthermore, the main housing is also provided with a vent, which is located directly opposite the side of the filter cartridge.

[0012] The beneficial effects of this utility model are as follows: by integrating the functions of a traditional cyclone sand separator and a filter cartridge sand separator into one unit, compared with the combined use of the two sand separators, the production cost and floor space are reduced, while the sand removal efficiency and effect are improved compared with the use of a single sand separator, and the frequency of on-site personnel maintaining the filter cartridge is reduced. Attached Figure Description

[0013] Figure 1 This is the main view structural diagram of this utility model;

[0014] Figure 2 yes Figure 1 The left view;

[0015] Figure 3 yes Figure 1 Cross-sectional structural diagram. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] One such Figure 1-3 The two-stage integrated desander shown includes a main shell 7 with a hollow channel and an air inlet A1 and an air outlet A2 located on its side. A filter cartridge 14 is positioned at the upper part of the hollow channel, and an axial-flow hydrocyclone 27 is positioned at the lower part. The axial-flow hydrocyclone 27 has a separation efficiency >97%, low pressure drop, and its separation efficiency is relatively less affected by changes in pressure, flow rate, and other operating conditions. The natural gas separated by the axial-flow hydrocyclone 27 is further filtered and separated by the filter cartridge 14 before being sent to downstream equipment. The filtration accuracy of the filter cartridge is 50μm to 800μm, and the filtration accuracy can be selected according to different well conditions.

[0018] The main shell 7 has a swirling air inlet chamber 24 connected to the air inlet A1 located at the lower part of the hollow channel. The swirling air inlet chamber 24 is fixed to a swirling outer cylinder 26 with a reduced diameter at the lower end. An axial flow swirler 27 is located inside the swirling outer cylinder 26. The axial flow swirler 27 has several swirling blades 25 on its outer periphery. An anti-winding seat 29 is set directly below the axial flow swirler 27. The anti-winding seat 29 is located at the bottom of the swirling outer cylinder 26. The through hole in the middle of the axial flow swirler 27 extends upward through the first seamless steel pipe 22 into the inner hole of the filter cartridge 14. The horizontal position of the outlet of the top of the first seamless steel pipe 22 is higher than the horizontal position of the air outlet A2.

[0019] As attached Figure 3 In the middle, the swirl inlet chamber 24 is a second seamless steel pipe arranged on the same central axis as the axial flow cyclone separator 27. The second seamless steel pipe is sleeved outside the axial flow cyclone separator 27 and the first seamless steel pipe 22. The upper end of the second seamless steel pipe is fixed to the first seamless steel pipe 22 through the cyclone separator sealing plate 21, and the lower end is sleeved on the upper end of the swirl outer cylinder 26 and fixed to it. The air inlet A1 is connected to the second seamless steel pipe through the air inlet pipe 23, and the central axis of the air inlet A1 and the air inlet pipe 23 is perpendicular to the central axis of the second seamless steel pipe.

[0020] During sand removal, natural gas containing impurities and sand enters through inlet A1, passes through inlet pipe 23 into cyclone inlet chamber 24, and then descends into cyclone outer cylinder 26. After the diameter is reduced, it swirls downward through cyclone vanes 25 of axial flow hydrocyclone 27. Various coarse impurities and sand in the natural gas descend due to the centrifugal force of the cyclone and settle into the sand collection area at the bottom of cyclone outer cylinder 26. The anti-winding seat 29 prevents impurity particles from being carried downstream. The natural gas after swirl enters upward through the through hole in the middle of axial flow hydrocyclone 27 into filter cartridge 14 for further filtration and sand removal, and then goes to downstream equipment through outlet A2.

[0021] In this case, the lower end of the main shell 7 is connected to the lower cylinder 9 via the first threaded flange 6, and the bottom of the lower cylinder 9 is provided with a lower flange cover 10; the outer circumference of the cyclone outer cylinder 26 is positioned on the inner wall of the lower cylinder 9 via a cyclone positioning block 28. The upper end of the main shell 7 is connected to the upper cylinder 3 via the second threaded flange 4, and the top of the upper cylinder 3 is provided with a pressure cap 2; the bottom of the filter cartridge 14 is positioned on the inner wall ring platform of the main shell 7 via a filter cartridge base 19, and the pressure cap 2 presses and positions the filter cartridge 14 on the filter cartridge base 19 via a sealing cover 13. To facilitate assembly and operation by the operator, pressure cap handles 12 are provided on both sides of the pressure cap 2. At the same time, a lifting eye screw 1 is provided on the top of the sealing cover 13, and the lifting eye screw 1 is located outside the pressure cap 2.

[0022] Finally, a vent A3 is also provided on the main housing 7. The vent A3 is located on the side facing the filter cartridge 14, which facilitates convenient operation by the equipment operators in the later stages.

[0023] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A two-stage integrated sand separator, characterized in that: The system includes a main housing (7) with a hollow channel and an air inlet (A1) and an air outlet (A2) on its side. A filter cartridge (14) is positioned at the upper part of the hollow channel and an axial flow cyclone separator (27) is positioned at the lower part. A cyclone inlet chamber (24) connected to the air inlet (A1) is positioned at the lower part of the hollow channel of the main housing (7). A cyclone outer cylinder (26) is fixedly connected to the lower end of the cyclone inlet chamber (24) with a reduced diameter. The axial flow cyclone separator (27) is positioned on the cyclone outer cylinder. (26) Inside, the axial flow hydrocyclone (27) has a number of swirl vanes (25) on its outer periphery, and an anti-winding seat (29) is provided directly below the axial flow hydrocyclone (27). The anti-winding seat (29) is located at the bottom of the outer swirl cylinder (26). The through hole in the middle of the axial flow hydrocyclone (27) extends upward through the first seamless steel pipe (22) into the inner hole of the filter cylinder (14), and the horizontal position of the top outlet of the first seamless steel pipe (22) is higher than the horizontal position of the air outlet (A2).

2. The two-stage integrated sand remover according to claim 1, characterized in that: The swirling air inlet chamber (24) is a second seamless steel pipe arranged on the same central axis as the axial swirling device (27). The second seamless steel pipe is sleeved on the axial swirling device (27) and the first seamless steel pipe (22). The upper end of the second seamless steel pipe is fixedly connected to the first seamless steel pipe (22) through the swirling device sealing plate (21), and the lower end is sleeved on the upper end of the swirling outer cylinder (26) and fixedly connected to it. The air inlet (A1) is connected to the second seamless steel pipe through the air inlet pipe (23), and the central axis of the air inlet (A1) and the air inlet pipe (23) is perpendicular to the central axis of the second seamless steel pipe.

3. The two-stage integrated sand remover according to claim 1, characterized in that: The lower end of the main shell (7) is connected to the lower cylinder (9) through the first threaded flange (6), and the bottom of the lower cylinder (9) is provided with a lower flange cover (10); the outer periphery of the swirling outer cylinder (26) is positioned on the inner wall of the lower cylinder (9) through the swirler positioning block (28).

4. The two-stage integrated sand remover according to claim 1, characterized in that: The upper end of the main housing (7) is connected to the upper cylinder (3) through the second threaded flange (4), and the top of the upper cylinder (3) is provided with a pressure cap (2); the bottom of the filter cylinder (14) is positioned on the inner wall ring platform of the main housing (7) through the filter cylinder base (19), and the pressure cap (2) presses the filter cylinder (14) tightly onto the filter cylinder base (19) through the sealing cap (13).

5. The two-stage integrated sand remover according to claim 4, characterized in that: The top of the sealing cap (13) is provided with a lifting eye screw (1), which is located outside the pressure cap (2).

6. The two-stage integrated sand remover according to claim 4, characterized in that: The pressure cap (2) is provided with pressure cap handles (12) on both sides.

7. The two-stage integrated sand remover according to claim 1, characterized in that: The filter cartridge (14) has a filtration accuracy of 50μm to 800μm.

8. The two-stage integrated sand remover according to claim 1, characterized in that: The main housing (7) is also provided with a vent (A3), which is located on the side facing the filter cartridge (14).

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