Ocean platform gas lift liquid exhauster

Abstract

An ocean platform gas lift liquid remover comprises an exhaust duct, a cover body, a centrifugal device, a fixed cover, a filter cage and a bottom support. Gas taken from a wellhead enters from the air inlet pipe, the centrifugal device pressurizes airflow in the rotating process, liquid is removed, liquid removal is further completed in the filter cage and the centrifugal cylinder, and finally the gas is exhausted from the air exhaust cylinder. The device is compact in structure and simple to assemble, and can be additionally arranged on the existing ocean platform at low cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of offshore platform gas lift liquid unloader, specifically a kind of device applied to offshore platform, liquid is removed to gas lift collection gas. BACKGROUND

[0002] With the gradual advancement of offshore oil and gas exploitation, some offshore oilfields gradually enter the later stage of exploitation. To solve the problem of decreasing oil recovery rate, gas lift technology is generally used, that is, high-pressure gas is injected into the well to maintain the recovery rate.

[0003] The gas used in the gas lift process needs to be treated for liquid removal after flowing back to the platform. However, the space on the offshore platform is limited, and it is not practical to arrange the gas lift liquid unloading equipment used on land on the platform. Therefore, it is necessary to design a gas lift liquid unloader that is compact in size and can be placed on the offshore platform. SUMMARY

[0004] To solve the problem of difficulty in installing a liquid removal device on an offshore platform, the utility model provides a kind of offshore platform gas lift liquid unloader. The device is compact in size and occupies less space. The applicability and economy of offshore platform installation are fully considered in the structure.

[0005] The utility model provides the technical scheme adopted to solve the technical problem: the utility model includes exhaust duct, cover body, centrifugal device, fixed cover, filter cage, bottom support. The cover body includes cover body flange, cover body sealing cylinder, cover body sealing groove, air inlet pipe. The centrifugal device includes centrifugal device flange, centrifugal device sealing groove, transmission rack, exhaust cylinder, reinforcing fin, centrifugal cylinder, centrifugal cylinder inner side wall, centrifugal cylinder outer side wall, centrifugal cylinder inner cavity, centrifugal cylinder outer cavity, impact cone cylinder, impact port, liquid discharge port, bottom support plate, support cone cylinder, liquid removal cylinder, liquid removal cylinder exhaust hole, centrifugal cylinder outer cavity exhaust hole, centrifugal device liquid discharge plate. The fixed cover includes fixed cover flange, protection cylinder, protection cylinder reinforcing plate, fixed cover bearing surface, liquid accumulation tank, fixed cover fixed plate. The bottom support includes filter cage support plate, filter cage support plate, bearing surface support plate. The cover body is composed of two mirror-symmetrical parts, which are sealed by gluing during assembly. The number of filter cages is 2, which are assembled at the liquid removal cylinder position. The filter cage support plate is attached to the filter cage cover, the filter cage support plate is attached to the filter cage wall, and the bearing surface support plate is attached to the support cone cylinder. The support cone cylinder is attached to the fixed cover bearing surface. The cover body sealing cylinder is attached to the exhaust cylinder outer wall.

[0006] The utility model has the advantages of compact structure, simple assembly and low cost installation on existing offshore platforms. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 The exhaust duct of the utility model.

[0008] Figure 2 The cover body of the utility model.

[0009] Figure 3 The utility model discloses centrifugal device.

[0010] Figure 4 The utility model discloses centrifugal device profile Figure 1 .

[0011] Figure 5 The utility model discloses centrifugal device profile Figure 2 .

[0012] Figure 6 The utility model discloses fixed cover.

[0013] Figure 7 The utility model discloses filter cage.

[0014] Figure 8 The utility model discloses bottom support.

[0015] Figure 9 The utility model discloses assembly drawing.

[0016] Figure 10 The utility model discloses appearance drawing.

[0017] 1, the air exhaust channel, 1-1, the air exhaust channel flange, 1-2, the air exhaust channel deflector, 1-3, the air exhaust channel reinforcing plate, 1-4, the platform deck, 1-5, the air exhaust pipe, 1-6, the "C" type steel, 2, the cover body, 2-1, the cover body flange, 2-2, the cover body sealing cylinder, 2-3, the cover body sealing groove, 2-4, the air inlet pipe, 2-5, the cover body screw hole, 3, the centrifugal device, 3-1, the centrifugal device flange, 3-2, the centrifugal device reinforcing strip, 3-3, the centrifugal device sealing groove, 3-4, the centrifugal device reinforcing rib, 3-5, the transmission rack, 3-6, the air exhaust cylinder, 3-7, the reinforcing fin, 3-8, the centrifugal cylinder, 3-8-1, the centrifugal cylinder inner side wall, 3-8-2, the centrifugal cylinder outer side wall, 3-8-01, the centrifugal cylinder inner chamber, 3-8-02, the centrifugal cylinder outer chamber, 3-9, the impact cone cylinder, 3-10, the impact port, 3-11, the liquid discharge port, 3-12, the bottom support plate, 3-13, the support cone cylinder, 3-14, the liquid discharge cylinder, 3-15, the liquid discharge cylinder exhaust hole, 3-16, the centrifugal cylinder outer chamber exhaust hole, 3-17, the centrifugal device liquid discharge plate, 4, the fixed cover, 4-1, the fixed cover flange, 4-2, the fixed cover flange screw hole, 4-3, the protection cylinder, 4-4, the protection cylinder reinforcing plate, 4-5, the fixed cover bearing surface, 4-6, the liquid accumulation tank, 4-7, the fixed cover fixed plate, 4-8, the fixed cover liquid discharge pipe, 5, the filter cage, 5-1, the filter cage wall, 5-2, the filter cage cover, 6, the bottom support, 6-1, the filter cage support plate, 6-2, the filter cage support plate, 6-3, the bearing surface support plate, 7, the bearing clamp, 8, the transmission chain, 9, the transmission shaft. DETAILED DESCRIPTION

[0018] Depend on Figure 1 , 9 As shown, Figure 1 The exhaust duct 1 is a modification of the existing deck when installing this utility model device. Platform deck 1-4 is the original deck of the offshore platform. A circular hole needs to be drilled in the deck to lead the exhaust pipe 1-5 to this location. The other end of the exhaust pipe 1-5 is connected to the next-stage treatment device after gas dehydration. A C-shaped steel 1-6 should be added to platform deck 1-4 at this location to increase strength. An exhaust duct reinforcing plate 1-3 is added between the exhaust pipe 1-5 and platform deck 1-4 to ensure structural strength. The inner wall of exhaust pipe 1-5 has an exhaust duct guide plate 1-2, which serves to strengthen the structure and guide the airflow upwards along the inner wall of exhaust pipe 1-5. The bottom of exhaust pipe 1-5 has an exhaust duct flange 1-1.

[0019] Depend on Figure 2 , 9 As shown, the bottom of the cover 2 is a cover flange 2-1 with cover screw holes 2-5. The top has a cover sealing cylinder 2-2, with a cover sealing groove 2-3 in the middle. An air inlet pipe 2-4 is located on one side of the cover 2. During assembly, [the following is unclear and likely refers to a specific assembly process]. Figure 2 The cover 2 shown and its mirror structure are welded together as a whole for assembly.

[0020] Depend on Figure 3 , 4 The centrifuge unit 3 shown in Figures 5 and 9 has a flange 3-1 at its top, with a sealing groove 3-3 on it. Below the flange 3-1 is the exhaust duct 3-6, with reinforcing ribs 3-4 at the connection point to strengthen the structure. Inside the exhaust duct 3-6, reinforcing strips 3-2 extend downwards. Three rows of drive racks 3-5 are located on the upper outer side of the exhaust duct 3-6.

[0021] The centrifuge device 3 mainly consists of three centrifuge cylinders 3-8. Each centrifuge cylinder 3-8 is a twisted crescent-shaped cylinder with an inner wall (3-8-1) and an outer wall (3-8-2). Inside each centrifuge cylinder 3-8, a partition divides the internal space into an inner cavity (3-8-01) and an outer cavity (3-8-02). A desiccant cylinder 3-14 is located at the center of the three centrifuge cylinders 3-8. A vent 3-15 connects the internal space of the desiccant cylinder 3-14 to the inner cavity (3-8-01). The inner cavity (3-8-01) and the outer cavity (3-8-02) are connected at the bottom. The outer cavity (3-8-02) communicates with the internal space of the exhaust duct 3-6 through a vent 3-16. The bottom of the outer cavity 3-8-02 of the centrifuge tube has a centrifuge device drain plate 3-17. There is a small gap between the centrifuge device drain plate 3-17 and the bottom of the centrifuge tube 3-8, which connects the cavity formed by the centrifuge device drain plate 3-17 with the outer cavity 3-8-02 of the centrifuge tube. The cavity can also be connected to the outside of the centrifuge tube 3-8 through the drain port 3-11.

[0022] A reinforcing fin 3-7 connects the exhaust duct 3-6 and the centrifuge tube 3-8, serving to adjust airflow and strengthen the structure. An impact cone 3-9 connects adjacent centrifuge tubes 3-8, with an impact port 3-10 at the connection point between the impact cone 3-9 and the inner wall 3-8-1 of the centrifuge tube. A supporting cone 3-13 is located at the bottom of the impact cone 3-9, connected to the bottom of both the impact cone 3-9 and the centrifuge tube 3-8 by a reinforcing plate, thus strengthening the structure. A bottom support plate 3-12 connects the bottom of the centrifuge tube 3-8 to the supporting cone 3-13, serving both airflow guidance and structural strengthening purposes.

[0023] Depend on Figure 6 As shown, the fixed cover 4 is a cylindrical structure with a fixed cover flange 4-1 at the top, on which are fixed cover flange bolt holes 4-2. The main structure is a protective cylinder 4-3, with a protective cylinder reinforcing plate 4-4 on its outer side. The protective cylinder reinforcing plate 4-4 extends downward to connect to the fixed cover fixing plate 4-7. The fixed cover fixing plate 4-7 is located outside the fixed cover bearing surface 4-5 and the liquid collection tank 4-6. The fixed cover fixing plate 4-7 has through holes for fixing. The bottom of the liquid collection tank 4-6 has a fixed cover drain pipe 4-8.

[0024] Depend on Figure 7 As shown, the filter cage 5 has a cylindrical filter cage wall 5-1 and filter cage covers 5-2 at both ends, with through holes on them.

[0025] Depend on Figure 8 As shown, the bottom support 6 consists of two parts: one end is the filter cage support plate 6-1, and the other end is the bearing surface support plate 6-3, which are connected in the middle by the filter cage support plate 6-2.

[0026] Depend on Figure 1 , 2 As shown in numbers 3, 4, 5, 6, 7, 8, 9, and 10.

[0027] During assembly, the location of exhaust duct 1 is first determined and constructed based on the conditions of the offshore platform. Exhaust pipe 1-5 is then connected to the next stage of treatment after gas dehydration. Next, centrifuge unit 3 is hoisted, and a sealing ring is placed in the centrifuge unit's sealing groove 3-3 and lubricated. Centrifuge unit flange 3-1 is then fitted to exhaust duct flange 1-1, and bearing clamp 1 is used to connect centrifuge unit flange 3-1 and exhaust duct flange 1-1, ensuring that centrifuge unit 3 can only rotate relative to exhaust duct 1.

[0028] At this point, the two filter cages 5 are installed one by one into the desiccant 3-14. The filter cage 5 installed first, i.e., the upper filter cage 5, is filled with resin balls with a diameter of 6 cm. The second filter cage 5 installed, i.e., the lower filter cage 5, is filled with resin balls with a diameter of 10 cm. After the filter cages 5 are installed into the desiccant 3-14, the base brackets 6 are installed. The filter cage support plate 6-1 is attached to the filter cage cover 5-2, the filter cage support plate 6-2 is attached to the filter cage wall 5-1, and the bearing surface support plate 6-3 rests against the support cone 3-13, thus completing the fixation of the two filter cages 5. There are three base brackets 6.

[0029] After completing the above steps, hoist the fixing cover 4 from the bottom of the centrifuge device 3 and move it upwards to fit the supporting cone 3-13 and the fixing cover bearing surface 4-5. Connect and fix the hoisting fixing cover 4 to the structure on the offshore platform through the through hole on the fixing plate 4-7.

[0030] Finally, install shroud 2 and its mirror structure. Place the sealing ring at the shroud sealing groove 2-3, and fit the shroud sealing cylinder 2-2 against the outer wall of the exhaust duct 3-6. Fit the shroud flange 2-1 against the fixed shroud flange 4-1, and use bolts to connect and secure the shroud bolt holes 2-5 and 4-2 of the fixed shroud flange. Seal the contact points between shroud 2 and its mirror structure with adhesive. Add several weld points at the contact points of the shroud sealing cylinder 2-2 to ensure the connection strength of shroud 2 and its mirror structure. After installation, connect the air inlet pipe 2-4 to the airlift return gas collection pipe.

[0031] After the main assembly is completed, the transmission racks 3-5 are connected to the power-providing transmission shafts 9 via the transmission chain 8. There are three transmission racks 3-5, with the middle one connected to an external transmission shaft 9 and the two outer racks 3-5 connected to another transmission shaft 9. The two transmission shafts 9 are located on both sides of the device of this utility model, and the rotation axes of the two transmission shafts 9 and the rotation axis of the centrifugal device 3 are in the same plane. Therefore, when the transmission shafts 9 drive the centrifugal device 3 to rotate, the tension of the three transmission racks 3-5 on the transmission chain 8 is balanced, preventing the centrifugal device 3 from tilting during operation.

[0032] When the device is in operation, the drive shaft 9 drives the centrifugal device 3 to rotate. The gas recovered by the air lift process from the wellhead enters through the air inlet pipe 2-4. The spiral structure of the centrifugal cylinder 3-8 guides the airflow to the position between the inner wall 3-8-1 of the lower centrifugal cylinder and the outer wall 3-8-2 of the adjacent centrifugal cylinder 3-8. When the airflow touches the impact cone 3-9, as the airflow flows downward, the space between the inner wall 3-8-1 of the centrifugal cylinder and the impact cone 3-9 becomes smaller, the gas is compressed, and flows at high speed through the impact port 3-10 to the bottom of the impact cone 3-9. It flows along the surface of the inner wall 3-8-1 of the centrifugal cylinder below the impact cone 3-9 and impacts the outer wall 3-8-2 of the centrifugal cylinder below the impact cone 3-9. During the impact process, a large amount of liquid carried in the gas adheres to the outer wall 3-8-2 of the centrifugal cylinder and flows down through the bottom support plate 3-12 into the liquid collection tank 4-6.

[0033] After impacting the outer wall 3-8-2 of the centrifuge tube below the impact cone 3-9, the airflow passes through the bottom support plate 3-12, accumulates above the liquid collection tank 4-6, and flows into the filter cage 5 in the dewatering cylinder 3-14. After entering the filter cage 5 through the through-hole on the filter cage cover 5-2, the airflow flows through the complex channels formed between the resin balls. During this process, the gas forms turbulence, and a large amount of liquid adheres to the resin balls, accumulates, and falls into the liquid collection tank 4-6 through the through-hole on the filter cage cover 5-2. During the upward movement of the airflow, the resin balls in the upper filter cage 5 have a smaller diameter, resulting in a faster airflow velocity and a more complex flow pattern, achieving rapid dewatering through impact with the resin balls and turbulence.

[0034] After the airflow reaches the top of the dehydration cylinder 3-14, it enters the inner cavity 3-8-01 of the centrifuge cylinder through the exhaust port 3-15 of the dehydration cylinder. At this position, the flow space increases and the airflow speed slows down. A small amount of liquid that has not been separated in the airflow adheres to the inner wall of the inner cavity 3-8-01 of the centrifuge cylinder under the centrifugal action and flows downward to the bottom of the inner cavity 3-8-01 and the outer cavity 3-8-02 of the centrifuge cylinder.

[0035] Before the device of this utility model is put into operation, liquid is injected into the bottom of the inner cavity 3-8-01 and the outer cavity 3-8-02 of the centrifuge tube through the drain port 3-11. The liquid covers the gap between the drain plate 3-17 of the centrifuge device and the outer cavity 3-8-02 of the centrifuge tube, so that the gas in the outer cavity 3-8-02 of the centrifuge tube cannot flow to the drain port 3-11 through the gap.

[0036] The airflow enters the outer cavity 3-8-02 of the centrifuge tube at the bottom of the inner cavity 3-8-01, and reaches the exhaust duct 3-6 through the exhaust port 3-16 of the outer cavity of the centrifuge tube, and finally flows out from the exhaust pipe 1-5.

[0037] The gas flow taken from the wellhead completes the separation of large droplets when it passes through the impact port 3-10 and impacts the outer wall 3-8-2 of the centrifuge tube. When it flows through the filter cage 5, it completes the separation of small droplets. The gas flow is further purified by dehydration in the inner cavity 3-8-01 and the outer cavity 3-8-02 of the centrifuge tube.

[0038] Liquid accumulated at the bottom of the centrifuge cylinder's inner cavity 3-8-01 and outer cavity 3-8-02 flows towards the gap between the centrifuge device's drain plate 3-17 and the outer cavity 3-8-02 under centrifugal force. When the liquid accumulates to a certain amount, it flows out from the drain port 3-11 and eventually into the accumulation tank 4-6. Liquid in the accumulation tank 4-6 will then flow out through the fixed cover drain pipe 4-8.

Claims

1. An air-lift deliquometer for offshore platforms, characterized in that, It includes an exhaust duct (1), a cover (2), a centrifugal device (3), a fixed cover (4), a filter cage (5), and a base support (6); The cover (2) includes a cover flange (2-1), a cover sealing cylinder (2-2), a cover sealing groove (2-3), and an air inlet pipe (2-4). The centrifuge device (3) includes a centrifuge device flange (3-1), a centrifuge device sealing groove (3-3), a transmission rack (3-5), an exhaust duct (3-6), reinforcing fins (3-7), a centrifuge cylinder (3-8), an inner wall of the centrifuge cylinder (3-8-1), an outer wall of the centrifuge cylinder (3-8-2), an inner cavity of the centrifuge cylinder (3-8-01), an outer cavity of the centrifuge cylinder (3-8-02), an impact cone (3-9), an impact port (3-10), a drain port (3-11), a bottom support plate (3-12), a support cone (3-13), a desliming cylinder (3-14), a desliming cylinder exhaust port (3-15), a centrifuge cylinder outer cavity exhaust port (3-16), and a centrifuge device drain plate (3-17). The fixed cover (4) includes a fixed cover flange (4-1), a protective cylinder (4-3), a protective cylinder reinforcing plate (4-4), a fixed cover bearing surface (4-5), a liquid collection tank (4-6), and a fixed cover fixing plate (4-7). The bottom support (6) includes a filter cage support plate (6-1), a filter cage support plate (6-2), and a bearing surface support plate (6-3). The cover (2) consists of two mirror-symmetrical parts, which are sealed with glue during assembly; There are two filter cages (5), which are assembled in the position of the liquid removal cylinder (3-14); the filter cage support plate (6-1) is attached to the filter cage cover (5-2), the filter cage support plate (6-2) is attached to the filter cage wall (5-1), and the bearing surface support plate (6-3) abuts against the support cone (3-13). The supporting cone (3-13) is in contact with the bearing surface (4-5) of the fixed cover; The sealing cylinder (2-2) of the cover is fitted to the outer wall of the exhaust duct (3-6).

2. The offshore platform air lift deliquometer according to claim 1, characterized in that, The exhaust duct (1) includes an exhaust duct flange (1-1), an exhaust duct guide plate (1-2), an exhaust duct reinforcing plate (1-3), a platform deck (1-4), and an exhaust pipe (1-5).

3. The offshore platform air lift deliquometer according to claim 1, characterized in that, There are 3 centrifuge tubes (3-8); the exhaust port (3-15) of the dehydration tube connects the internal space of the dehydration tube (3-14) with the inner cavity (3-8-01) of the centrifuge tube; the inner cavity (3-8-01) of the centrifuge tube is connected to the outer cavity (3-8-02) of the centrifuge tube at the bottom; the outer cavity (3-8-02) of the centrifuge tube is connected to the internal space of the exhaust duct (3-6) through the exhaust port (3-16) of the outer cavity of the centrifuge tube; The centrifuge tube outer cavity (3-8-02) has a centrifuge device drain plate (3-17) at the bottom. There is a gap between the centrifuge device drain plate (3-17) and the bottom of the centrifuge tube (3-8) to connect the cavity formed by the centrifuge device drain plate (3-17) with the centrifuge tube outer cavity (3-8-02). The cavity can be connected to the outside of the centrifuge tube (3-8) through the drain port (3-11).

4. The offshore platform air lift deliquometer according to claim 1, characterized in that, The filter cage (5) is filled with resin balls.

5. The offshore platform air lift deliquometer according to claim 1, characterized in that, The number of transmission racks (3-5) is 3.

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