Water injection buffer tank with oil skimming, sand removing and corrosion resisting functions
Patent Information
- Application Number
- CN202522333021.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-04
- Publication Date
- 2026-10-13
- Estimated Expiration
- 2035-11-04
AI Technical Summary
通常，缓冲罐是常压罐体，主要起缓冲作用，但对于上游来液成分复杂、下游处理原始水质指标要求高的情况下，则需要注水缓冲罐长期保持一个相对稳定可靠的运行状态，尽量减少上游来液杂质、含油等长期积累和生产水对罐体的腐蚀对注水缓冲罐正常运行造成的不良影响
本实用新型提供了一种具备撇油除砂耐腐蚀功能的注水缓冲罐，适用于石化行业或者水处理行业等领域对预处理的生产处理水进行下一流程更精细层次处理前使用，适用于常压或者微正压的注水缓冲，具有撇油、除砂、耐腐的特性，尤其适用于海上原油生产中心平台的生产水回注系统使用。
Smart Images
Figure CN224848368U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the petrochemical industry or water treatment industry, and specifically relates to a water injection buffer tank with oil skimming, sand removal and corrosion resistance functions. Background Technology
[0002] The water injection process on offshore oil platforms is relatively complex. Water injection buffer tanks, as key equipment in this process, primarily serve a buffering function. Typically, buffer tanks are atmospheric pressure tanks, mainly for this purpose. However, when the upstream fluid composition is complex and the downstream raw water quality requirements are high, the water injection buffer tank needs to maintain a relatively stable and reliable operating state over the long term. This is to minimize the adverse effects of long-term accumulation of impurities and oil from the upstream fluid, as well as corrosion of the tank by the production water, on the normal operation of the water injection buffer tank.
[0003] Therefore, it is urgent to solve the problem that existing buffer tanks lack oil skimming, sand removal, and corrosion resistance functions. Utility Model Content
[0004] This utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a water injection buffer tank with oil skimming, sand removal and corrosion resistance functions.
[0005] This utility model is achieved through the following technical solution: A water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions includes a tank body and an oil skimming mechanism and a sand removal mechanism disposed inside the tank body; the tank body has a vertically arranged inlet chamber baffle and a drain chamber baffle; the inlet chamber baffle is fully welded to the inner top surface and the inner walls of the front and rear sides of the tank body, and the drain chamber baffle is fully welded to the inner bottom surface and the inner walls of the front and rear sides of the tank body; the oil skimming mechanism includes an inlet chamber oil skimming trough disposed in the inlet chamber and a drain chamber oil skimming trough disposed in the drain chamber; the sand removal mechanism includes two sand removers disposed in the inlet chamber and the drain chamber, respectively.
[0006] In the above technical solution, the water inlet chamber partition and the drain chamber partition are arranged parallel and spaced apart; and the water inlet chamber partition and the drain chamber partition are arranged parallel to the left and right side walls; a gap is provided between the bottom surface of the water inlet chamber partition and the bottom surface of the tank body; and a gap is provided between the top surface of the drain chamber partition and the top surface of the tank body.
[0007] In the above technical solution, the tank body is a cuboid structure, and its inner surface is treated with ceramic paint for corrosion protection; the tank body is equipped with a frame structure beam, and multiple angle steels are welded to the outer wall of the tank body except for the bottom surface.
[0008] In the above technical solution, the top of the tank body is provided with a return water inlet, a water inlet chamber top connection port, a drain chamber top connection port, and a drain chamber manhole; the return water inlet and the water inlet chamber are connected; the water inlet chamber top connection port and the water inlet chamber are connected, the drain chamber top connection port and the drain chamber are connected, and the water inlet chamber top connection port and the drain chamber top connection port are connected by a pipeline; the drain chamber manhole and the water inlet chamber are connected. An overflow port, a drain port, and a drain cavity vent are provided on the lower left side wall of the tank body. The overflow port is connected to a U-shaped pipe section located outside the tank body. The front sidewall of the tank body is provided with a sand removal port for the water inlet chamber, a sand removal port for the water outlet chamber, a vent for the water inlet chamber, and a manhole for the water inlet chamber. The sand removal ports for the water inlet chamber and the water outlet for the water outlet chamber are both located at the bottom of the front sidewall and are connected to the water inlet chamber and the water outlet chamber, respectively. The sand removal ports for the water inlet chamber and the water outlet chamber are externally connected to the closed-loop pipeline of the production system via flanges. The vent for the water inlet chamber is located at the bottom of the front sidewall and is connected to the water inlet chamber. The manhole for the water inlet chamber is located at the lower part of the front sidewall and is connected to the water inlet chamber. The tank body is equipped with an internal ladder, which is located inside the drainage chamber, and the internal ladder is positioned corresponding to the manhole of the drainage chamber.
[0009] In the above technical solution, a skid base is provided at the bottom of the tank body; the skid base is welded and fixed to the bottom surface of the tank body; the skid base is formed by welding together I-beams; a grounding stake is provided on the skid base, and the skid base is connected to the grounding system through a grounding wire.
[0010] In the above technical solution, a corrosion-resistant zinc block is welded to the bottom of the water inlet chamber of the tank body; a venting assembly is provided on the top of the tank body, and the venting assembly is connected to the venting pipeline of the production system.
[0011] In the above technical solution, the outer wall of the tank body is provided with a drain chamber level gauge assembly and a water inlet chamber level gauge assembly. The drain chamber level gauge assembly is connected to the drain chamber, and the water inlet chamber level gauge assembly is connected to the water inlet chamber. The drain chamber level gauge assembly and the water inlet chamber level gauge assembly have the same structure, both including a level gauge, a level transmitter, and isolation valves disposed at the upper and lower ends of the level gauge.
[0012] In the above technical solution, a ladder is provided on the left side wall of the tank body, and a protective cage is provided in the upper part of the ladder; a guardrail is provided around the top of the tank body, and a personnel entrance is provided at the junction of the guardrail and the ladder; a nameplate is provided on any side wall of the tank body.
[0013] In the above technical solution, the oil skimming trough in the water inlet chamber and the oil skimming trough in the drainage chamber are not connected. Both the oil skimming trough in the water inlet chamber and the oil skimming trough in the drainage chamber are located at a high position in the chamber and are welded and fixed to the inner wall of the tank body and the partition plate of the water inlet chamber. The oil skimming trough in the water inlet chamber and the oil skimming trough in the drainage chamber have the same structural dimensions and are both U-shaped grooves. Pipelines are installed at the bottom of the oil skimming trough in the water inlet chamber and the oil skimming trough in the drainage chamber, respectively, and are connected to the drain outlet of the oil skimming trough in the drainage chamber and the drain outlet of the oil skimming trough in the water inlet chamber.
[0014] In the above technical solution, the sand remover is set at the bottom of the tank body. The sand remover includes a main pipe and multiple sand flushing branch pipes evenly distributed along the axis of the main pipe. The sand flushing branch pipes are composed of a left branch pipe and a right branch pipe. The left branch pipe and the right branch pipe are symmetrically distributed with the main pipe as the center line. Both the left branch pipe and the right branch pipe are inclined downward at 45°.
[0015] The beneficial effects of this utility model are: This utility model provides a water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions. It is suitable for use in the petrochemical industry or water treatment industry before pretreated production water undergoes further finer treatment in the next process. It is suitable for water injection buffering under normal pressure or slightly positive pressure and has the characteristics of oil skimming, sand removal, and corrosion resistance. It is especially suitable for use in the production water reinjection system of offshore crude oil production center platforms. Attached Figure Description
[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is the front view of this utility model; Figure 3 This is the left view of this utility model; Figure 4 This is a top view of the present invention; Figure 5 This is a front view of the device installed on the outside of the tank body according to this utility model; Figure 6 This is a left view of the device installed on the outside of the tank body according to this utility model; Figure 7 This is a top view of the device installed on the outside of the tank body according to this utility model.
[0017] in: 1. Tank body; 2. Skid base; 3. Inlet chamber baffle; 4. Drain chamber baffle; 501. Main inlet; 502. Return water inlet; 503. Overflow outlet; 504. Drain outlet; 505. Inlet chamber sand removal outlet; 506. Drain chamber sand removal outlet; 507. Drain chamber skimming trough drain outlet; 508. Inlet chamber skimming trough drain outlet; 509. Inlet chamber vent; 5010. Drain chamber vent; 5011. Inlet chamber top connection port; 50 12. Drainage chamber top connection port; 6. Skimming trough; 601. Inlet water chamber skimming trough; 602. Drainage chamber skimming trough; 7. Drainage chamber manhole; 8. Internal ladder; 9. Inlet water chamber manhole; 10. Sand remover; 1001. Main pipe; 1002. Sand flushing branch pipe; 11. Anti-corrosion zinc block; 12. Vent assembly; 13. Guardrail; 14. Ladder; 15. Drainage chamber level gauge assembly; 16. Inlet water chamber level gauge assembly; 17. Grounding stake; 18. Nameplate.
[0018] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation
[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0020] like Figures 1-7 As shown, a water injection buffer tank with oil skimming, sand removal and corrosion resistance functions includes a tank body 1 and an oil skimming mechanism and a sand removal mechanism disposed inside the tank body 1. The tank body 1 is vertically equipped with an inlet chamber partition 3 and a drain chamber partition 4; the inlet chamber partition 3 and the drain chamber partition 4 are parallel and spaced apart; the inlet chamber partition 3 and the drain chamber partition 4 are parallel to the left and right side walls; the spacing between the inlet chamber partition 3 and the drain chamber partition 4 is 800mm~1000mm. The drainage chamber partition 4 divides the inner cavity of the tank body 1 into an inlet chamber and a drainage chamber. The inlet chamber partition 3 and the right wall form an inlet chamber; the drainage chamber partition 4 and the left wall form a drainage chamber. The water inlet baffle 3 is fully welded to the inner top surface and the inner walls of the front and rear sides of the tank body 1 without leaving any gaps; the lower part of the water inlet baffle 3 is left empty, and the vertical distance between the bottom surface of the water inlet baffle 3 and the inner bottom surface of the tank body 1 is 1000mm; the water inlet baffle 3 is a rectangular carbon steel plate with dimensions of 5746*3040*12mm. The drainage chamber baffle 4 is fully welded to the inner bottom surface and the inner walls of the front and rear sides of the tank body 1 without leaving any gaps; the upper part of the drainage chamber baffle 4 is left open, and the vertical distance between the top surface of the drainage chamber baffle 4 and the inner top surface of the tank body 1 is 1500mm; the drainage chamber baffle 4 is a rectangular carbon steel plate with dimensions of 5746*1500*12mm. The tank body 1 is a rectangular parallelepiped structure made of carbon steel. The steel plate on the top surface of the tank body 1 is 8mm thick, the steel plates on all four side walls are 12mm thick, and the steel plate on the bottom surface is 18mm thick. The dimensions of the tank body 1 are 7000*5800*4200mm, with an effective volume of 120m³. 3 ;l The inner surface of the tank body 1 is treated with ceramic paint for corrosion protection. The tank body 1 is provided with a frame structure beam, which is used to support the tank body. The outer wall of the tank body 1, except for the bottom surface, is welded with multiple angle steels. The angle steels are used to strengthen the tank body and prevent deformation. The lower part of the rear side wall of the tank body 1 is provided with a main inlet 501, and an upward elbow is provided inside the tank body 1 to connect with the main inlet 501. The top of the tank body 1 is provided with a return water inlet 502, a water inlet chamber top connection port 5011, a drain chamber top connection port 5012, and a drain chamber manhole 7; the return water inlet 502 is connected to the water inlet chamber; the water inlet chamber top connection port 5011 is connected to the water inlet chamber, and the drain chamber top connection port 5012 is connected to the drain chamber, and the water inlet chamber top connection port 5011 and the drain chamber top connection port 5012 are connected by a pipeline to balance the gas pressure between the water inlet chamber and the drain chamber, which is equivalent to a communicating vessel; the drain chamber manhole 7 is connected to the water inlet chamber; an end cap is provided on the drain chamber manhole 7, the end cap is a rotary cap, and the size of the drain chamber manhole 7 is DN500mm; The lower left side wall of the tank body 1 is provided with an overflow port 503, a drain port 504 and a drain cavity vent 5010. The overflow port 503 is connected to a U-shaped pipe section located outside the tank body 1; the drain port 504 is connected to the downstream processing flow; the drain cavity vent 5010 is used to drain the water at the bottom of the drain cavity during tank overhaul and cleaning. The front sidewall of the tank body 1 is provided with a sand removal port 505 for the water inlet chamber, a sand removal port 506 for the water outlet chamber, a vent port 509 for the water inlet chamber, and a manhole 9 for the water inlet chamber. The sand removal ports 505 and 506 for the water inlet chamber are both located at the bottom of the front sidewall and are connected to the water inlet chamber and the water outlet chamber, respectively. The sand removal ports 505 and 506 are externally connected to the closed-loop pipeline of the production system via flanges. The vent port 509 for the water inlet chamber is located at the bottom of the front sidewall and is connected to the water inlet chamber. It is used to drain the water at the bottom of the water inlet chamber during tank cleaning and overhaul. The manhole 9 for the water inlet chamber is located at the lower part of the front sidewall and is connected to the water inlet chamber. The manhole 9 for the water inlet chamber is provided with an end cover. The end cover is a vertical hanging cover. The size of the manhole 9 for the water inlet chamber is DN600mm. The rear side wall of the tank body 1 is provided with a drain outlet 507 for the oil skimming trough in the drainage chamber and a drain outlet 508 for the oil skimming trough in the water inlet chamber. The drain outlet 507 for the oil skimming trough in the drainage chamber and the drain outlet 508 for the oil skimming trough in the water inlet chamber are respectively connected to the bottom of the corresponding oil skimming trough 602 in the drainage chamber and the oil skimming trough 601 in the water inlet chamber through pipelines, so as to discharge the sludge oil inside the oil skimming mechanism to the sludge oil pipe. Valves are provided on the outside of the oil skimming trough 602 in the drainage chamber and the oil skimming trough 601 in the water inlet chamber to realize the opening degree control. The tank body 1 is provided with an internal ladder 8, which is located in the drainage cavity. The internal ladder 8 is positioned in a position corresponding to the manhole 7 of the drainage cavity. The outer wall of the tank body 1 is provided with a drain chamber level gauge assembly 15 and an inlet chamber level gauge assembly 16. The drain chamber level gauge assembly 15 is connected to the drain chamber, and the inlet chamber level gauge assembly 16 is connected to the inlet chamber. The drain chamber level gauge assembly 15 and the inlet chamber level gauge assembly 16 have the same structure, both including a level gauge, a level transmitter, and isolation valves located at the upper and lower ends of the level gauge. The bottom of the tank body 1 is provided with a skid base 2; the skid base 2 is welded and fixed to the bottom surface of the tank body 1; the skid base 2 is made of H-beams welded together and is made of carbon steel. A grounding stake 17 is provided on the skid base 2; the grounding stake 17 is welded to the skid base 2 and can be connected to the grounding system through a grounding wire to release static electricity. The bottom of the water inlet cavity of the tank body 1 is welded with an anti-corrosion zinc block 11; A venting assembly 12 is provided on the top of the tank body 1, and the venting assembly 12 is connected to the venting pipeline of the production system. The venting assembly 12 includes an isolation ball valve, a venting breather valve, a venting pipeline, etc., and is connected to the top of the water inlet chamber of the tank body 1 via a flange; the venting assembly 12 is a conventional device. A ladder 14 is provided on the left side wall of the tank body 1, and a safety cage is provided in the upper part of the ladder 14 to protect personnel safety. The top of the tank body 1 is surrounded by a guardrail 13, and a personnel entrance is provided at the junction of the guardrail 13 and the ladder 14. A nameplate 18 is provided on any side wall of the tank body 1; All sharp parts of the water injection buffer tank are rounded or chamfered during processing, and burrs are removed.
[0021] Except for the anti-corrosion zinc block 11 and the sand removal component 10, the internal components of the tank body 1 and the inner wall of the tank body 1 are all treated with ceramic paint; the exterior of the tank body 1 is treated with epoxy zinc-rich primer, phenolic epoxy intermediate paint and topcoat. The corrosion allowance of the water injection buffer tank is 3mm, the design temperature is 102℃, the operating temperature is 58℃~72℃, and the design service life is 25 years. The design, manufacture, hydrostatic test, inspection, and acceptance of the water injection buffer tank shall comply with the requirements of NB / T 47003.1-2022 and ASME B31.3.
[0022] All butt welds of the water injection buffer tank need to be inspected for flaws, with an inspection rate of no less than 10%.
[0023] The oil skimming mechanism includes an inlet chamber oil skimming trough 601 disposed in the inlet chamber and a drain chamber oil skimming trough 602 disposed in the drain chamber. The inlet chamber oil skimming trough 601 and the drain chamber oil skimming trough 602 are not connected. Both the inlet chamber oil skimming trough 601 and the drain chamber oil skimming trough 602 are located at a high position in the chamber and are welded and fixed to the inner wall of the tank body 1 and the inlet chamber partition 3. The inlet chamber oil skimming trough 601 and the drain chamber oil skimming trough 602 have the same structural dimensions. They are both U-shaped grooves with a groove width of 250mm and a groove depth of 200mm. The material is 12mm thick carbon steel plate. Pipelines are installed at the bottom of the inlet chamber oil skimming trough 601 and the drain chamber oil skimming trough 602, respectively connected to the drain outlet 507 of the drain chamber oil skimming trough and the drain outlet 508 of the inlet chamber oil skimming trough. The sand removal mechanism includes two sand removers 10, one in the inlet chamber and the other in the outlet chamber, which are respectively located at the bottom of the tank body 1. The sand remover 10 includes a main pipe 1001 and a plurality of sand flushing branch pipes 1002 evenly distributed along the axis of the main pipe. The sand flushing branch pipes are composed of a left branch pipe and a right branch pipe. The left branch pipe and the right branch pipe are symmetrically distributed with the main pipe as the center line. Both the left branch pipe and the right branch pipe are inclined downward at 45°. The sand separator 10 is made of 316 stainless steel, the main pipe 1001 is a 2-inch pipe, and the sand flushing branch pipe is a 3 / 4-inch pipe.
[0024] How to use this utility model: When the device is put into operation, production water enters the inlet chamber inside the tank body 1 through inlet 501 and return outlet 502. Under the action of gravity, impurities gradually settle at the bottom of the inlet chamber, while oil in the water is present at the top of the inlet chamber. The production water enters the drain chamber through inlet chamber baffle 3 and drain chamber baffle 4. The drain chamber level gauge assembly 15 and inlet chamber level gauge assembly 16 maintain the liquid level in the inlet chamber at the area of the skimming trough 6. At this time, the oil in the water mainly accumulates in the skimming trough 6. By controlling the opening of the regulating valve of the sludge pipeline connected to the skimming trough 6, the oil can be continuously discharged. Due to the presence of inlet chamber baffle 5, the oil in the inlet chamber is basically kept in the upper part of the inlet chamber. The medium passing through inlet chamber baffle 5 is mainly water. The oil content in the inlet chamber is higher than that in the drain chamber, so the inlet chamber skimming trough 601 plays the main role in skimming oil. The presence of the drainage chamber baffle 4 prevents most impurities from the inlet chamber from entering the drainage chamber. Any impurities that do enter the drainage chamber accumulate at the bottom of the tank due to gravity. By periodically using the sand separator 10 to remove sand from both chambers, especially the inlet chamber, the accumulated impurities can be periodically discharged from the tank body 1 through the sand discharge ports 505 and 506. Similarly, due to the presence of the inlet chamber baffle 3 and the inlet chamber skimming trough 601, only a small amount of oil in the water enters the drainage chamber, and the oil entering the drainage chamber can be discharged through the pipeline on the skimming trough 602. After the above treatment, qualified production water can be discharged through the drain port 504 and enter the next processing stage. If the liquid level is too high during operation, because the tank is connected to an overflow port 503, the inlet of which is located at the bottom of the tank. The overflow pipe outside the tank has an upward U-shaped bend, its height slightly higher than the tank's high liquid level. If a control system error causes the liquid level inside the tank to rise, the production water exceeding the control height will overflow through the overflow port to a designated area, preventing overflow. Since the overflow port is located at the bottom of the tank and within the drainage chamber, the oil content in the overflow water is minimized. Gas accumulated inside the tank enters the production system's venting pipeline through the venting assembly 12. The drainage chamber level gauge assembly 15 and the inlet chamber level gauge assembly 16 transmit the liquid level signal to the central control unit for monitoring. If personnel need to enter the tank for maintenance during use, the tank can be emptied of production water, and maintenance can be performed through two manholes: the drainage chamber manhole 7 and the inlet chamber manhole 9, respectively.
[0025] Except for the desander 10 and the anti-corrosion zinc block 11, the interior of the tank body 1 is coated with ceramic paint. This coating process effectively protects the internal materials from direct contact with the production water, preventing corrosion and perforation, which would otherwise reduce functionality. Furthermore, even if some of the paint inside is damaged by impact, the anti-corrosion zinc block 11 welded inside the tank, utilizing cathodic protection with sacrificial anodes, can reduce corrosion of the carbon steel inside the tank. The desander assembly is made of stainless steel, achieving corrosion resistance without the need for a coating.
[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.
Claims
1. A water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions, characterized in that: The tank body (1) includes an oil skimming mechanism and a sand removal mechanism disposed inside the tank body (1); the tank body (1) is vertically provided with an inlet chamber partition (3) and a drain chamber partition (4); the inlet chamber partition (3) is fully welded to the inner top surface and the inner walls of the front and rear sides of the tank body (1), and the drain chamber partition (4) is fully welded to the inner bottom surface and the inner walls of the front and rear sides of the tank body (1); the oil skimming mechanism includes an inlet chamber oil skimming trough (601) disposed in the inlet chamber and a drain chamber oil skimming trough (602) disposed in the drain chamber; the sand removal mechanism includes two sand removers (10) disposed in the inlet chamber and the drain chamber respectively.
2. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The water inlet baffle (3) and the drain baffle (4) are arranged parallel and spaced apart; and the water inlet baffle (3) and the drain baffle (4) are arranged parallel to the left and right side walls; a gap is provided between the bottom surface of the water inlet baffle (3) and the inner bottom surface of the tank body (1); a gap is provided between the top surface of the drain baffle (4) and the inner top surface of the tank body (1).
3. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The tank body (1) is a cuboid structure, and its inner surface is treated with ceramic paint for corrosion protection. The tank body (1) is equipped with a frame structure beam, and multiple angle steels are welded to the outer wall of the tank body (1) except for the bottom surface.
4. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The top of the tank body (1) is provided with a return water inlet (502), a water inlet chamber top connection port (5011), a drain chamber top connection port (5012), and a drain chamber manhole (7); the return water inlet (502) is connected to the water inlet chamber; the water inlet chamber top connection port (5011) is connected to the water inlet chamber, the drain chamber top connection port (5012) is connected to the drain chamber, and the water inlet chamber top connection port (5011) and the drain chamber top connection port (5012) are connected by a pipeline; the drain chamber manhole (7) is connected to the water inlet chamber. An overflow port (503), a drain port (504), and a drain cavity vent (5010) are provided on the lower left side wall of the tank body (1). The overflow port (503) is connected to a U-shaped pipe section provided outside the tank body (1). The front side wall of the tank body (1) is provided with a sand removal port (505) for the water inlet chamber, a sand removal port (506) for the water outlet chamber, a vent port (509) for the water inlet chamber, and a manhole (9) for the water inlet chamber. The sand removal ports (505) and (506) for the water inlet chamber are both located at the bottom of the front side wall and are connected to the water inlet chamber and the water outlet chamber, respectively. The sand removal ports (505) and (506) for the water inlet chamber are connected to the closed pipeline of the production system through flanges. The vent port (509) for the water inlet chamber is located at the bottom of the front side wall and is connected to the water inlet chamber. The manhole (9) for the water inlet chamber is located at the lower part of the front side wall and is connected to the water inlet chamber. The tank body (1) is provided with an internal ladder (8), which is located inside the drainage chamber. The internal ladder (8) is positioned in a position corresponding to the manhole (7) of the drainage chamber.
5. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The bottom of the tank body (1) is provided with a skid base (2); the skid base (2) is welded and fixed to the bottom surface of the tank body (1); the skid base (2) is made of I-beams welded together; a grounding stake (17) is provided on the skid base (2), and the skid base (2) is connected to the grounding system through a grounding wire.
6. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The bottom of the water inlet chamber of the tank body (1) is welded with a corrosion-resistant zinc block (11); the top of the tank body (1) is provided with a venting assembly (12), which is connected to the venting pipeline of the production system.
7. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The outer wall of the tank body (1) is provided with a drain chamber level gauge assembly (15) and an inlet chamber level gauge assembly (16). The drain chamber level gauge assembly (15) is connected to the drain chamber, and the inlet chamber level gauge assembly (16) is connected to the inlet chamber. The drain chamber level gauge assembly (15) and the inlet chamber level gauge assembly (16) have the same structure, both including a level gauge, a level transmitter, and isolation valves located at the upper and lower ends of the level gauge.
8. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: A ladder (14) is provided on the left side wall of the tank body (1), and a protective cage is provided in the upper part of the ladder (14); a guardrail (13) is provided around the top of the tank body (1), and a personnel entrance is provided at the junction of the guardrail (13) and the ladder (14); a nameplate (18) is provided on any side wall of the tank body (1).
9. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The oil skimming trough (601) in the water inlet chamber and the oil skimming trough (602) in the drainage chamber are not connected. Both the oil skimming trough (601) in the water inlet chamber and the oil skimming trough (602) in the drainage chamber are located at the high position of the chamber and are welded and fixed to the inner wall of the tank body (1) and the partition plate (3) in the water inlet chamber. The oil skimming trough (601) in the water inlet chamber and the oil skimming trough (602) in the drainage chamber have the same structural dimensions and are both U-shaped grooves. Pipelines are installed at the bottom of the oil skimming trough (601) in the water inlet chamber and the oil skimming trough (602) in the drainage chamber, and are connected to the drain outlet (507) of the oil skimming trough in the drainage chamber and the drain outlet (508) of the oil skimming trough in the water inlet chamber, respectively.
10. The water injection buffer tank with oil skimming, sand removal, and corrosion resistance functions according to claim 1, characterized in that: The sand remover (10) is located at the bottom of the tank body (1). The sand remover (10) includes a main pipe (1001) and multiple sand flushing branch pipes (1002) evenly distributed along the axis of the main pipe. The sand flushing branch pipes consist of a left branch pipe and a right branch pipe. The left branch pipe and the right branch pipe are symmetrically distributed with the main pipe as the center line. Both the left branch pipe and the right branch pipe are inclined downward at 45°.