Skid-mounted device for treating oilfield produced water

Abstract

The utility model designs an oilfield produced water treatment skid-mounted device which comprises a stirring chamber and a bubble contact chamber, a settling chamber is arranged between the stirring chamber and the bubble contact chamber, a partition plate is arranged between the settling chamber and the bubble contact chamber, an inclined plate is arranged on the partition plate and has elasticity, and the inclined plate is obliquely fixed relative to the partition plate. The distance from the inclined plate to the partition plate is gradually increased from bottom to top, a water inlet hole is formed in the partition plate and located above the joint of the inclined plate and the partition plate, a flow guide pipe is connected to the stirring chamber, one end of the flow guide pipe is arranged on the upper portion of the stirring chamber, the other end of the flow guide pipe is arranged on the lower portion of the settling chamber, and the lower portion of the flow guide pipe penetrates through the inclined plate; a brush is arranged on the baffle plate, and flocculates are settled more completely through the arrangement of the inclined plate, the baffle plate and the brush. The device has the effect that flocculates are separated more cleanly.

Description

Technical Field

[0001] The present application relates to the field of oilfield produced water, and in particular to a skid-mounted device for treating oilfield produced water. Background Art

[0002] In the secondary recovery of oil, water injection development is the main development method. At present, most of the development wells in my country's oil fields are developed by water injection. Along with the water injection development of oil fields, the treatment and discharge of oil field produced water have emerged. Oil field produced water is usually separated by gravity and flotation tank flotation separation technology to remove harmful substances in oil field produced water or reduce them to the standard level, so that oil field produced water can be used, achieving the purpose of reducing consumption, protecting the environment, and reusing water resources.

[0003] In the related art, the flotation tank separation technology is to use an oilfield produced water treatment skid-mounted device with a flotation tank to treat the oilfield produced water. The flotation tank is installed on a skid seat located at the bottom of the flotation tank. The flotation tank includes a flocculation chamber and a bubble contact chamber. After the flocculant is added to the flocculation chamber and stirred, the oilfield produced water flows into the bubble contact chamber. The suspended matter is lifted to the upper surface of the liquid in the bubble contact chamber through flotation separation. A scraper is arranged on the upper part of the bubble contact chamber to separate the suspended matter and water.

[0004] With respect to the above-mentioned related technologies, the floccules will directly settle in the bubble contact chamber, and a part of the floccules will be suspended in the water due to the influence of the bubbles in the bubble contact chamber, resulting in unclean separation of the floccules. Utility Model Content

[0005] In order to improve the effect of flocculant settling, the present application provides a skid-mounted device for oilfield produced water treatment.

[0006] The present application provides a skid-mounted device for oilfield produced water treatment that adopts the following technical solution:

[0007] A skid-mounted device for treating produced water from an oil field comprises a stirring chamber and a bubble contact chamber, a sedimentation chamber is arranged between the stirring chamber and the bubble contact chamber, a partition is arranged between the sedimentation chamber and the bubble contact chamber, an inclined plate is arranged on the partition, the inclined plate is tilted and fixed compared with the partition, the distance from the inclined plate to the partition gradually increases from bottom to top, a water inlet hole is opened on the partition, the water inlet hole is located above the connection between the inclined plate and the partition, a guide pipe is connected to the stirring chamber, one end of the guide pipe is arranged at the upper part of the stirring chamber, and the other end of the guide pipe is at the lower part of the sedimentation chamber and passes through the inclined plate.

[0008] By adopting the above technical scheme, a sedimentation chamber is arranged between the stirring chamber and the bubble contact chamber, one end of the guide pipe is arranged at the upper part of the stirring chamber, and the other end of the guide pipe is arranged at the lower part of the sedimentation chamber. After the oilfield produced water is stirred and mixed, it flows into the lower part of the sedimentation chamber through the guide pipe, and the flocculants in the water settle under the inclined plate. In the process of the water surface rising along the inclined plate, the flocculants in the water will collide with the inclined plate, and some flocculants will adhere to the inclined plate. The attached flocculants will combine with adjacent flocculants to form larger flocculants and settle. After settling under the inclined plate, the water containing less flocculants rises to the upper edge of the inclined plate and overflows, flows down from the top of the inclined plate through the water inlet hole and enters the bubble contact chamber, thereby reducing the outflow of flocculants from the sedimentation chamber, and achieving a cleaner floc separation effect.

[0009] Preferably, a water inlet pipe is provided at the upper part of the mixing chamber, and an electric three-way regulating valve is provided on the water inlet pipe. The electric three-way regulating valve is installed above the water inlet pipe perpendicular to the axis of the water inlet pipe, and the two ends of the electric three-way regulating valve are respectively connected to the PAC feed pipe and the PAM feed pipe.

[0010] By adopting the above technical solution, the electric three-way regulating valve controls the opening and closing states of the valves of the PAC feed pipe and the PAM feed pipe, thereby controlling the feeding ratio, making it easy to make adjustments according to actual needs.

[0011] Preferably, a baffle is provided on the inclined plate, and the baffle is integrally provided with or welded to the inclined plate, and the angle of the baffle is inclined downward.

[0012] By adopting the above technical solution, a baffle is arranged on the inclined plate. When the water flows upward along the inclined plate, the baffle changes the path of the water flow, so that the water flows along the baffle inclined downward, thereby promoting the sedimentation of flocculants.

[0013] Preferably, the baffle is provided with brushes, and the brushes are evenly distributed on the lower surface of the baffle.

[0014] By adopting the above technical solution, when the water flows along the baffle inclined downward, the water will pass through the evenly distributed brushes, the water will pass normally, and the flocculants will adhere to the brushes, thereby promoting the separation of the flocculants.

[0015] Preferably, a reciprocating motion mechanism is arranged between the inclined plate and the side wall of the sedimentation chamber, and the reciprocating motion mechanism includes a rotating shaft, a connecting rod, a ball head, a ball groove and a groove and a convex shaft. The convex shaft is arranged on the rotating shaft, and the convex shaft is arranged at an eccentric position of the rotating shaft. The convex shaft is slidably connected in the groove, and the groove is connected to the middle of the ball head through a connecting rod. The ball groove is fixed on the inclined plate, and the ball head is movably connected in the ball groove.

[0016] By adopting the above technical solution, the rotating shaft rotates, the convex shaft on the rotating shaft drives the groove to reciprocate in the horizontal direction, the groove drives the ball head through the connecting rod, and the ball head further drives the ball groove to reciprocate, so that the inclined plate shakes, which is convenient for cleaning the flocculants deposited on the inclined plate and the brush.

[0017] Preferably, a sliding mechanical sealing mechanism is provided at the connection between the inclined plate and the guide tube, and the guide tube passes through the sliding mechanical sealing mechanism.

[0018] By adopting the above technical solution, the sliding sealing device can reduce water leakage at the connection point, and when the inclined plate shakes, the guide pipe slides relative to the sliding mechanical sealing mechanism.

[0019] Preferably, a stirring mechanism is provided in the stirring chamber, and the stirring mechanism comprises a stirring motor, a stirring shaft and blades. The stirring shaft is coaxially fixed with the rotating shaft of the stirring motor, and the blades are provided on the stirring shaft.

[0020] By adopting the above technical solution, the stirring motor shaft drives the stirring shaft to rotate, and the stirring shaft drives the blades to make the water in the stirring chamber convect. The stirring mechanism can make the pre-mixed water mix more evenly, which is conducive to the sedimentation of flocculants in the sedimentation chamber.

[0021] Preferably, the scraper includes a gear, a transmission chain and a scraper plate, the gear and the transmission chain cooperate with each other, the scraper plate is arranged on the transmission chain, and the transmission chain and the scraper plate rotate integrally.

[0022] By adopting the above technical solution, the motor drives the gear to rotate, the gear drives the transmission chain to rotate, and then drives the scraper to rotate together, so that the upper scum can be separated from the water, so that the oilfield produced water contains less suspended matter, which is beneficial to the further treatment of the oilfield produced water.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Through the setting of the sedimentation chamber, the flocculants in the produced water of the oil field can be settled in the sedimentation chamber, which can achieve a cleaner separation effect of the flocculants;

[0025] 2. Through the setting of the electric three-way regulating valve, the produced water from the oil field can be pre-mixed with PAC and PAM to improve the mixing efficiency;

[0026] 3. Through the reciprocating motion mechanism, the inclined plate and the baffle and brush on the inclined plate can be shaken for cleaning without disassembly, which is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a cross-sectional view of the skid-mounted device for oilfield produced water treatment according to an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the installation position of the electric three-way regulating valve in the embodiment of the present application.

[0029] Figure 3 It is a schematic diagram of the installation position of the reciprocating motion mechanism in the embodiment of the present application.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. water inlet pipe; 2. electric three-way regulating valve; 21. PAC feed pipe; 22. PAM feed pipe; 3. stirring chamber; 4. sedimentation chamber; 5. bubble contact chamber; 6. guide pipe; 7. inclined plate; 8. baffle; 9. brush; 10. sliding mechanical sealing mechanism; 11. scum groove; 12. scraper; 121. gear; 122. transmission chain; 123. scraper plate; 13. drainage hole; 14. slag discharge hole; 15. aeration port; 16. reciprocating motion mechanism; 161. rotating shaft; 162. connecting rod; 163. ball head; 164. ball groove; 165. support plate; 166. groove; 167. convex shaft; 17. water inlet hole; 18. stirring mechanism; 181. stirring motor; 182. stirring shaft; 183. blade; 19. partition. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given.

[0032] This embodiment discloses a skid-mounted device for treating oilfield produced water. Figure 1 and Figure 2The skid-mounted device for oilfield produced water treatment includes a stirring chamber 3 and a bubble contact chamber 5. A water inlet pipe 1 is arranged on the upper part of the stirring chamber 3, and an electric three-way regulating valve 2 is arranged on the water inlet pipe 1. The electric three-way regulating valve 2 is perpendicular to the axis of the water inlet pipe 1, and the electric three-way regulating valve 2 is installed above the water inlet pipe 1. The two ends of the electric three-way regulating valve 2 are respectively connected to a PAC feed pipe 21 and a PAM feed pipe 22. The electric three-way regulating valve 2 controls the opening and closing states of the valves of the PAC feed pipe 21 and the PAM feed pipe 22, thereby controlling the proportion of the feed. Adding PAC and PAM into the water inlet pipe 1 at the same time can make PAC and PAM premixed with water. The premixing can improve the mixing efficiency by first proportioning. After mixing, the water enters the stirring chamber 3. A stirring mechanism 18 is installed in the stirring chamber 3. The stirring mechanism 18 includes a stirring motor 181, a stirring shaft 182 and blades 183. The stirring shaft 182 is coaxially fixed with the rotating shaft of the stirring motor 181. The blades 183 are arranged on the stirring shaft 182. The rotating shaft of the stirring motor 181 drives the stirring shaft 182 to rotate. The stirring shaft 182 drives the blades 183 to cause water convection in the stirring chamber 3. The stirring mechanism 18 can make the premixed water evenly mixed and convected in the stirring chamber 3. The stirring of the stirring mechanism 18 is conducive to the flocculation process.

[0033] Reference Figure 1 A settling chamber 4 is provided between the stirring chamber 3 and the bubble contact chamber 5. The settling chamber 4 serves to settle the flocculants in the produced water of the oil field after stirring, reduce the flocculants in the water, and make the flotation separation effect in the next step of the bubble contact chamber 5 better. A partition 19 is provided between the settling chamber 4 and the bubble contact chamber 5. An inclined plate 7 is provided on the partition 19. The inclined plate 7 is tilted and fixed compared with the partition 19. The distance from the inclined plate 7 to the partition 19 gradually increases from bottom to top. A flow guide pipe 6 is connected to the stirring chamber 3. One end of the flow guide pipe 6 is provided at the upper part of the stirring chamber 3, and the other end of the flow guide pipe 6 is at the lower part of the settling chamber 4. The lower part of the flow guide pipe 6 passes through the inclined plate 7. A sliding mechanical sealing mechanism 10 is provided at the connection between the flow guide pipe 6 and the inclined plate 7. The flow guide pipe 6 passes through the sliding mechanical sealing mechanism 10. The flow guide pipe 6 can slide in the sliding mechanical sealing mechanism 10. The sliding mechanical sealing mechanism 10 can reduce water leakage at the connection.

[0034] Reference Figure 1When the produced water from the oil field after stirring enters the sedimentation chamber 4 through the guide pipe 6, the water containing a large amount of flocculants will gradually fill the sedimentation chamber 4 from bottom to top. The guide pipe 6 below the inclined plate 7 can ensure that no matter where the water surface is, the water containing more flocculants flowing in through the guide pipe 6 is always in the lower part of the sedimentation chamber 4, so that the flocculants in the water have sufficient time to settle. In the process of the water surface rising along the inclined plate 7, the flocculants will gradually settle, and the flocculants contained in the water in the sedimentation chamber 4 will gradually decrease from bottom to top. A baffle 8 is provided on the inclined plate 7. The baffle 8 and the inclined plate 7 are integrally arranged or welded. The angle of the baffle 8 is inclined downward. A plurality of baffles 8 are distributed in parallel on the inclined plate 7. A brush 9 is fixedly provided on the lower surface of the baffle 8, and the brush 9 is evenly distributed on the baffle 8. When the water surface rises along the inclined plate 7 , the water flow will contact the brushes 9 evenly arranged on the baffle 8 , and the suspended flocs in the water will adhere to the brushes 9 , thereby reducing the outflow of the flocs from the settling chamber 4 .

[0035] Reference Figure 1 and Figure 3 The inclined plate 7 and the side wall of the sedimentation chamber 4 are connected with a reciprocating mechanism 16, which includes a rotating shaft 161, a connecting rod 162, a ball head 163, a ball groove 164, a support plate 165, a groove 166 and a convex shaft 167. The rotating shaft 161 is arranged on the side wall of the sedimentation chamber 4, and the rotating shaft 161 is connected with a motor outside the side wall of the sedimentation chamber 4. The convex shaft 167 is arranged on the rotating shaft 161, and the convex shaft 167 is installed at a position where the rotating shaft 161 deviates from the center of the rotating shaft 161. The convex shaft 167 is slidably connected in the groove 166. The middle of the groove 166 is an arc structure. The middle of the groove 166 and the ball head 163 are connected by a connecting rod 162. The support plate 165 is fixed on the side wall of the sedimentation chamber 4. The connecting rod 162 is between the two supporting plates 165. The ball groove 164 is fixed on the inclined plate 7. The head 163 is stuck in the ball groove 164, and the motor drives the rotating shaft 161 to rotate, and the rotating shaft 161 will drive the convex shaft 167 to do circular motion. When the convex shaft 167 does circular motion, it will drive the groove 166 to do horizontal reciprocating motion. The groove 166 drives the ball head 163 through the connecting rod 162, and the ball head 163 further drives the ball groove 164 to shake. The inclined plate 7 is elastic, and the shaking of the ball groove 164 causes the inclined plate 7 to shake. When flocculants are deposited on the inclined plate 7 and the brush 9, they can be cleaned regularly by utilizing the shaking of the inclined plate 7, which is more convenient without disassembly.

[0036] Reference Figure 1When the water surface exceeds the upper edge of the inclined plate 7, the water with less flocculants in the upper layer will overflow, and the overflowed water will flow down along the inclined plate 7. A water inlet hole 17 is opened on the partition 19, and the water inlet hole 17 is located above the connection between the inclined plate 7 and the partition 19. An aeration port 15 is arranged at the water inlet hole 17. The water overflowing from the inclined plate 7 enters the bubble contact chamber 5 through the water inlet hole 17, and is aerated through the aeration port 15. The suspended matter in the water will float to the upper layer of the water surface with the bubbles. A scraper 12 is arranged on the bubble contact chamber 5. The scraper 12 includes a gear 121, a transmission chain 122 and a scraper plate 123. The gear 121 is connected to a motor. The gear 121 cooperates with the transmission chain 122. The scraper plate 123 is arranged on the transmission chain 122. The transmission chain 122 and the scraper plate 123 rotate as a whole. The motor rotates to drive the gear 121 to rotate, and the gear 121 drives the transmission chain 122 to rotate, thereby driving the scraper plate 123 to rotate. A scum trough 11 is provided at the end of the scraper 12, and the scraper plate 123 rotates with the transmission chain 122 to scrape the upper scum into the scum trough 11. A scum discharge hole 14 is provided on the scum trough 11, and the scum is discharged through the scum discharge hole 14. A drainage hole 13 is provided on the bubble contact chamber 5, and the drainage hole 13 is at the lower part of the bubble contact chamber 5. The treated oilfield produced water enters the next step of processing device through the drainage hole 13.

[0037] The implementation principle of a skid-mounted device for treating produced water from an oilfield in an embodiment of the present application is as follows: produced water from the oilfield passes through a water inlet pipe 1, and is mixed with PAC and PAM through an electric three-way regulating valve 2. After mixing, the produced water enters a mixing chamber 3 for stirring. After being evenly stirred, the produced water enters a lower part of a settling chamber 4 through a flow guide pipe 6. The water flows along an inclined plate 7 from bottom to top and gradually fills the settling chamber 4. When the water flows through a baffle 8 and a brush 9, the flocculants will adhere to the water, so that the water with less flocculants overflows from above the inclined plate 7 and then flows downward along the inclined plate 7 to the water inlet hole 17, enters the bubble contact chamber 5 through the water inlet hole 17, is aerated through an aeration port 15, and the scum floats to the upper layer. The scum is scraped to a scum tank 11 by a scraper 12, and the scum is discharged through a scum discharge hole 14 for treatment. The treated produced water from the oilfield flows into the next link through the drainage hole 13 below for treatment. The inclined plate 7, the baffle plate 8 and the brush 9 can be cleaned regularly by shaking the inclined plate 7 driven by the reciprocating motion mechanism 16, which is convenient and does not require disassembly.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A skid-mounted device for treating produced water in an oil field, comprising a stirring chamber (3) and a bubble contact chamber (5), wherein a scraper (12) is arranged on the bubble contact chamber (5), characterized in that: A sedimentation chamber (4) is arranged between the stirring chamber (3) and the bubble contact chamber (5), a partition (19) is arranged between the sedimentation chamber (4) and the bubble contact chamber (5), an inclined plate (7) is arranged on the partition (19), the inclined plate (7) is tilted and fixed compared to the partition (19), the distance between the inclined plate (7) and the partition (19) gradually increases from bottom to top, a water inlet hole (17) is opened on the partition (19), the water inlet hole (17) is located above the connection between the inclined plate (7) and the partition (19), the stirring chamber (3) is connected to a flow guide pipe (6), one end of the flow guide pipe (6) is arranged at the upper part of the stirring chamber (3), and the other end of the flow guide pipe (6) is located at the lower part of the sedimentation chamber (4) and passes through the inclined plate (7).

2. The skid-mounted device for oilfield produced water treatment according to claim 1, characterized in that: A water inlet pipe (1) is arranged at the top of the stirring chamber (3), and an electric three-way regulating valve (2) is arranged on the water inlet pipe (1). The electric three-way regulating valve (2) is installed above the water inlet pipe (1) perpendicular to the axis of the water inlet pipe (1), and two ends of the electric three-way regulating valve (2) are respectively connected to a PAC feed pipe (21) and a PAM feed pipe (22).

3. The skid-mounted device for oilfield produced water treatment according to claim 1, characterized in that: A baffle (8) is provided on the inclined plate (7); the baffle (8) and the inclined plate (7) are integrally provided or welded together; the baffle (8) is inclined downward.

4. The skid-mounted device for oilfield produced water treatment according to claim 3, characterized in that: The baffle plate (8) is provided with a brush (9), and the brushes (9) are evenly distributed on the lower surface of the baffle plate (8).

5. The skid-mounted device for oilfield produced water treatment according to claim 1, characterized in that: A reciprocating mechanism (16) is provided between the inclined plate (7) and the side wall of the sedimentation chamber (4). The reciprocating mechanism (16) comprises a rotating shaft (161), a connecting rod (162), a ball head (163), a ball groove (164), a groove (166), and a convex shaft (167). The convex shaft (167) is provided on the rotating shaft (161). The convex shaft (167) is provided at an eccentric position of the rotating shaft (161). The convex shaft (167) is slidably connected in the groove (166). The groove (166) and the ball head (163) are connected in the middle via a connecting rod (162). The ball groove (164) is fixed on the inclined plate (7). The ball head (163) is movably connected in the ball groove (164).

6. The skid-mounted device for oilfield produced water treatment according to claim 1, characterized in that: A sliding mechanical sealing mechanism (10) is provided at the connection between the inclined plate (7) and the flow guide tube (6), and the flow guide tube (6) passes through the sliding mechanical sealing mechanism (10).

7. The skid-mounted device for treating oilfield produced water according to claim 1, characterized in that: A stirring mechanism (18) is provided in the stirring chamber (3), the stirring mechanism (18) comprising a stirring motor (181), a stirring shaft (182) and a blade (183), the stirring shaft (182) being coaxially fixed with the rotating shaft of the stirring motor (181), and the blade (183) being provided on the stirring shaft (182).

8. The skid-mounted device for oilfield produced water treatment according to claim 1, characterized in that: The scraper (12) comprises a gear (121), a transmission chain (122) and a scraper plate (123); the gear (121) and the transmission chain (122) cooperate with each other; the scraper plate (123) is arranged on the transmission chain (122); and the transmission chain (122) and the scraper plate (123) rotate integrally.

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