Corrosion-resistant oil-gas cyclone separation device

Abstract

The invention discloses an anti-corrosion oil-gas cyclone separation device which comprises a shell assembly, an annular end socket is arranged in the shell assembly, a cylindrical cavity flow separation pipe is fixedly connected to the bottom end of the inner diameter of the annular end socket, spiral guide vanes are welded to the outer surface of the cavity flow separation pipe, and the top ends of the guide vanes are connected with the annular end socket. The guide vanes are fixedly connected with the inner surface of the shell assembly, a cylindrical drainage rod penetrates through the center of the annular end socket, one end of the drainage rod is fixedly connected with a top drainage cone, and the other end of the drainage rod is fixedly connected with a bottom drainage cone; the drainage rod and the drainage cone are arranged at the axial position of the separator, so that the annular streaming effect is favorably formed, gas-liquid separation is promoted, turbulence energy consumption is weakened, and outflow of gas at a top flow opening and liquid at a bottom flow opening is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield gathering, transportation and processing equipment, and in particular relates to a corrosion-resistant oil-gas cyclone separation device. Background Art

[0002] In recent years, with the industrialized test of CO2 throughput, the CO2 content in the produced gas has gradually increased. In the context of limited corrosion resistance of the gathering and transportation system, in order to meet the requirements of gas-liquid separation and reduce the CO2 content in the liquid phase, the development of compact, corrosion-resistant, and easy-to-replace gas-liquid separators has become a new trend. Gas-liquid cyclone separators are widely used in the field of petroleum industry due to their advantages such as small footprint, easy installation, flexible operation, stable and continuous operation, no wearing parts, convenient maintenance, economic cost and low operating cost.

[0003] According to different cyclone-generating methods, gas-liquid cyclone separators in the prior art can be divided into columnar, axial flow and tangential flow types; however, conventional gas-liquid cyclones in oil fields generally have the disadvantages of weak cyclone centrifugal effect, poor gas-liquid separation effect, large pressure drop of the fluid after passing through the cyclone, and poor corrosion resistance.

[0004] Therefore, there is an urgent need for a small-scale, corrosion-resistant oil-gas cyclone separation device with the characteristics of miniaturization, strong cyclone generation, weak pressure drop and corrosion resistance. Summary of the invention

[0005] The purpose of the present invention is to provide a corrosion-resistant oil-gas cyclone separation device, which solves the problems in the prior art of poor separation effect and large pressure drop of the fluid after passing through the cyclone due to the drainage structure.

[0006] The technical solution adopted by the present invention is a corrosion-resistant oil and gas cyclone separation device, including a shell assembly, an annular head is arranged inside the shell assembly, a cylindrical cavity isolation tube is fixedly connected to the bottom end of the inner diameter of the annular head, a spiral guide vane is welded to the outer surface of the cavity isolation tube, the top of the guide vane is connected to the annular head, the guide vane is fixedly connected to the inner surface of the shell assembly, a cylindrical drainage rod is passed through the center of the annular head, one end of the drainage rod is fixedly connected to the top drainage cone, and the other end of the drainage rod is fixedly connected to the bottom drainage cone.

[0007] The present invention is also characterized in that the shell assembly comprises a top flow inlet round tube, a top head shell, a cylindrical swirl shell, a conical swirl shell and a bottom flow inlet round tube which are welded in sequence from top to bottom, a single cut inlet pipe is tangentially connected to the side surface of the cylindrical swirl shell, and a guide vane is welded to the cylindrical swirl shell;

[0008] The top head shell is elliptical, and the radial length of the top head shell is 50cm to 300cm;

[0009] The thickness of the top flow inlet circular tube, the top head shell, the cylindrical swirl shell, the conical swirl shell and the bottom flow inlet circular tube are all 8cm to 20cm;

[0010] The outer diameter of the annular head is the same as the diameter of the cylindrical swirl shell;

[0011] The diameter of the diversion rod is not greater than the diameter of the bottom flow outlet circular tube;

[0012] The inner surface of the shell assembly, the surface of the annular head, the surface of the cavity isolation tube and the surface of the guide vane are all coated with an epoxy resin anti-corrosion coating with a thickness of 1mm to 2mm.

[0013] The beneficial effects of the present invention are:

[0014] (1) The corrosion-resistant oil-gas cyclone separation device of the present invention is provided with a single cut-inlet pipe and a spiral guide vane at the gas-liquid two-phase flow inlet, which helps to stabilize the rotation flow of the two-phase flow and maintain the laminar flow characteristics;

[0015] (2) The conical swirl structure in the middle and lower part of the device of the present invention can present a better droplet coalescence effect and promote the coalescence of droplets at the bottom flow outlet;

[0016] (3) The device of the present invention is provided with a guide rod and a guide cone at the axial position of the separator, which is conducive to forming an annular flow effect, promoting gas-liquid separation, reducing turbulent energy consumption, and facilitating the outflow of gas from the top flow port and liquid from the bottom flow port;

[0017] (4) The device of the present invention is coated with a layer of epoxy resin anti-corrosion coating on the fluid contact interface inside the device to reduce the corrosion of the device caused by CO2 and H2S dissolved in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the corrosion-resistant oil-gas cyclone separation device of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the housing assembly of the cyclone separation device of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the cyclone separation device of the present invention;

[0021] Figure 4 It is a top view of the annular head, the cavity flow separator and the guide vane of the cyclone separation device of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the guide rod of the cyclone separation device of the present invention;

[0023] In the figure, 1. shell assembly, 101. top flow inlet circular tube, 102. top head shell, 103. cylindrical swirl shell, 104. conical swirl shell, 105. bottom flow inlet circular tube, 106. single cut inlet pipe, 2. annular head, 3. cavity isolation tube, 4. guide vane, 5. diversion rod, 6. top diversion cone, 7. bottom diversion cone. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 , Figure 2 As shown, the present invention provides a corrosion-resistant oil-gas cyclone separation device including a shell assembly 1, the shell assembly 1 includes a top flow port circular tube 101, a top head shell 102, a cylindrical cyclone shell 103, a conical cyclone shell 104 and a bottom flow port circular tube 105 welded in sequence from top to bottom, the side surface of the cylindrical cyclone shell 103 is tangentially connected with a single cut inlet pipe 106, and the cylindrical cyclone shell 103 is welded with a guide vane 4; the top head shell 102 is elliptical, the radial length of the top head shell 102 is 50cm to 300cm, and the diameter of the top head shell 102 is 10 times that of the top flow port circular tube 101; the top head shell 102 and the cylindrical cyclone shell 103 have the same diameter, forming a cylindrical cyclone cavity, the cylindrical cyclone shell 103 and the conical cyclone shell 104 have the same top diameter, forming a conical cyclone cavity, and the bottom end diameter of the conical cyclone shell 104 is the same as the diameter of the bottom flow port circular tube 105.

[0026] The thickness of the top flow port circular tube 101, the top head shell 102, the cylindrical swirl shell 103, the conical swirl shell 104 and the bottom flow port circular tube 105 are all 8 cm to 20 cm.

[0027] The diameter of the single-cut inlet pipe 106 is determined by the gas-liquid two-phase flow rate, and the gas-liquid two-phase flow velocity in the single-cut inlet pipe 106 is controlled at 12m / s to 20m / s; the upper side of the single-cut inlet pipe 106 is tangent to the upper part of the cylindrical cyclone shell 103, the outer side of the single-cut inlet pipe 106 is tangent to the outer side of the cylindrical cyclone shell 103, and the axial direction of the single-cut inlet pipe 106 is perpendicular to the axial direction of the cylindrical cyclone shell 103;

[0028] An annular head 2 is provided inside the shell assembly 1, and the outer diameter of the annular head 2 is the same as the diameter of the cylindrical cyclone shell 103; the inner diameter of the annular head 2 is 0.5 times the outer diameter of the annular head 2; the inner diameter of the annular head 2 is the same as the diameter of the cavity isolation tube 3, and the length of the cavity isolation tube 3 is 1.3 times the length of the cylindrical cyclone shell 103;

[0029] A cylindrical cavity isolation tube 3 is fixedly connected to the bottom inner diameter end of the annular head 2, and a spiral guide vane 4 is welded to the outer surface of the cavity isolation tube 3. The guide vane 4 surrounds the cavity isolation tube 3 1.5 times, and the top end of the guide vane 4 is connected to the annular head 2. The guide vane 4 is fixedly connected to the inner surface of the shell assembly 1 to form a sealed guide cavity.

[0030] A cylindrical drainage rod 5 is passed through the center of the annular head 2. The drainage rod 5 is three times the length of the cylindrical vortex shell 103. The upper part of the drainage rod 5 is parallel to the annular head 2. One end of the drainage rod 5 is fixedly connected to a top drainage cone 6. The length of the top drainage cone 6 is 1.5 times the height of the top head shell 102. The other end of the drainage rod 5 is fixedly connected to a bottom drainage cone 7. The length of the bottom drainage cone 7 is the same as the length of the vortex shell 103. The diameter of the drainage rod 5 is not greater than the diameter of the bottom flow outlet circular tube 105.

[0031] The inner surface of the shell assembly 1, the surface of the annular head 2, the surface of the cavity isolation tube 3 and the surface of the guide vane 4 are all coated with an epoxy resin anti-corrosion coating with a thickness of 1 mm to 2 mm.

[0032] The working process of the present invention is as follows: the gas-liquid two-phase flow enters the spiral guide blade 4 tangentially from the single cut-in inlet pipe 106; the guide blade 4 changes the movement direction of the gas-liquid two-phase flow to form a strong swirl; due to the difference in density, after the gas-liquid two-phase fluid passes through the guide blade 4, the liquid phase is subjected to a large centrifugal force and is concentrated on the side wall, while the gas phase is concentrated in the center; then it enters the conical swirl shell 104, and as the circular cross-section of the conical structure gradually decreases, the swirl centrifugal motion of the gas-liquid two-phase flow gradually increases, and a good droplet coalescence effect is presented at the edge of the conical structure, and the particle size of the liquid collected in the bottom flow outlet circular tube 105 is relatively large, and the liquid phase gathers and flows out from the bottom flow outlet circular tube;

[0033] With the generation of gas-liquid two-phase flow swirl, the pressure at the edge of the fluid gradually increases, while the pressure at the center of the fluid decreases, and the gas phase gathered in the center flows out through the cavity isolation tube 3, the top head shell 102, and the top flow port circular tube 101 in sequence; in addition, the guide rod 5, the top guide cone 6 and the bottom guide cone 7 arranged in the axial position of the cyclone separator can not only enhance the annular flow effect and the gas-liquid separation effect, but also reduce the turbulent energy consumption of the gas and liquid phases and reduce the pressure drop loss; a layer of epoxy resin anti-corrosion coating is coated on the fluid contact interface inside the device to reduce the corrosion of CO2 and H2S to the equipment after dissolving in water.

[0034] Example 1

[0035] The present embodiment provides a corrosion-resistant oil-gas cyclone separation device, comprising a shell assembly 1, an annular head 2 is arranged inside the shell assembly 1, a cylindrical cavity isolation tube 3 is fixedly connected to the bottom end of the inner diameter of the annular head 2, a spiral guide vane 4 is welded to the outer surface of the cavity isolation tube 3, the top end of the guide vane 4 is connected to the annular head 2, the guide vane 4 is fixedly connected to the inner surface of the shell assembly 1, a cylindrical drainage rod 5 is passed through the center position of the annular head 2, one end of the drainage rod 5 is fixedly connected to the top drainage cone 6, and the other end of the drainage rod 5 is fixedly connected to the bottom drainage cone 7.

[0036] Example 2

[0037] Based on Example 1, the shell assembly 1 includes a top flow inlet circular tube 101, a top head shell 102, a cylindrical swirl shell 103, a conical swirl shell 104 and a bottom flow inlet circular tube 105 welded in sequence from top to bottom, the side surface of the cylindrical swirl shell 103 is tangentially connected with a single cut inlet pipe 106, and the cylindrical swirl shell 103 is welded with a guide vane 4; the top head shell 102 is elliptical, and the radial length of the top head shell 102 is 50 cm to 300 cm.

[0038] Example 3

[0039] Based on Example 1, the thickness of the top flow inlet circular tube 101, the top head shell 102, the cylindrical cyclone shell 103, the conical cyclone shell 104 and the bottom flow inlet circular tube 105 are all 8cm to 20cm; the outer diameter of the annular head 2 is the same as the diameter of the cylindrical cyclone shell 103.

[0040] The diameter of the drainage rod 5 is not greater than the diameter of the bottom flow outlet circular tube 105 .

[0041] Example 4

[0042] On the basis of Example 1, the inner surface of the shell assembly 1, the surface of the annular head 2, the surface of the cavity flow isolation tube 3 and the surface of the guide vane 4 are all coated with an epoxy resin anti-corrosion coating with a thickness of 1 mm to 2 mm.

Claims

1. Anti-corrosion oil-gas cyclone separation device, characterized in that: The invention comprises a shell assembly (1), wherein an annular head (2) is arranged inside the shell assembly (1), a cylindrical cavity flow isolation tube (3) is fixedly connected to the inner diameter bottom end of the annular head (2), a spiral guide vane (4) is welded to the outer surface of the cavity flow isolation tube (3), the top end of the guide vane (4) is connected to the annular head (2), the guide vane (4) is fixedly connected to the inner surface of the shell assembly (1), a cylindrical drainage rod (5) is passed through the center of the annular head (2), one end of the drainage rod (5) is fixedly connected to a top drainage cone (6), and the other end of the drainage rod (5) is fixedly connected to a bottom drainage cone (7).

2. The corrosion-resistant oil-gas cyclone separation device according to claim 1, characterized in that: The shell assembly (1) comprises a top flow inlet circular tube (101), a top head shell (102), a cylindrical swirl shell (103), a conical swirl shell (104) and a bottom flow inlet circular tube (105) which are welded in sequence from top to bottom; a single cut-in inlet tube (106) is tangentially connected to the side surface of the cylindrical swirl shell (103); and the guide vane (4) is welded to the cylindrical swirl shell (103).

3. The corrosion-resistant oil-gas cyclone separation device according to claim 2, characterized in that: The top head shell (102) is elliptical, and the radial length of the top head shell (102) is 50 cm to 300 cm.

4. The corrosion-resistant oil-gas cyclone separation device according to claim 2, characterized in that: The thickness of the top flow port circular tube (101), the top head shell (102), the cylindrical cyclone shell (103), the conical cyclone shell (104) and the bottom flow port circular tube (105) are all 8 cm to 20 cm.

5. The corrosion-resistant oil-gas cyclone separation device according to claim 2, characterized in that: The outer diameter of the annular head (2) is the same as the diameter of the cylindrical cyclone shell (103).

6. The corrosion-resistant oil-gas cyclone separation device according to claim 2, characterized in that: The diameter of the drainage rod (5) is not greater than the diameter of the bottom flow outlet circular tube (105).

7. The corrosion-resistant oil-gas cyclone separation device according to claim 1, characterized in that: The inner surface of the shell component (1), the surface of the annular head (2), the surface of the cavity isolation tube (3) and the surface of the guide vane (4) are all coated with an epoxy resin anti-corrosion coating with a thickness of 1 mm to 2 mm.

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