A device for removing oil from oil sand produced water

Abstract

The present application belongs to the technical field of oil-water separation equipment, and discloses an oil-sand oil produced water oil removal device, aiming at solving the problems of liquid disturbance destroying oil-water stratification, low separation efficiency and sampling valve easy to scale and leak in the prior art. The device comprises a tank body and a liquid inlet steady flow unit, the liquid inlet steady flow unit comprises a containing cavity, an arc-shaped buffer plate, an annular baffle and a conical hopper. Through the structure of the liquid inlet steady flow unit, the produced water enters from the top opening, is preliminarily slowed down by the arc-shaped buffer plate, and is guided to the bottom of the containing cavity through the flow channel formed by the annular baffle and the conical hopper, so as to effectively isolate the liquid disturbance and avoid impacting the original liquid in the tank. Finally, the produced water flows into the tank body smoothly from the overflow port. The tank is sequentially provided with a flow straightener and a two-stage packing type gas-liquid separator, so as to realize gas-liquid and oil-water separation, effectively protect the formed oil-water gravity stratification interface, and improve the oil-liquid separation efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil-water separation equipment technology, specifically to an oil sands produced water oil removal device. Background Technology

[0002] With the growth of global oil demand and the increasing scarcity of conventional oil resources, oil sands, which are sandstones impregnated with heavy petroleum, are products of bituminous crude oil losing lighter components during migration. They are characterized by high density, high viscosity, high C-H ratio, and high metal content. After processing, the oil sands oil is separated and sent to the oil collection area. The oil sands oil in the collection area undergoes dehydration and purification treatment at the oil sands oil treatment station. The workflow is as follows: The oil sands oil in the collection area first enters the steam processor, where the oil sands undergo a thermal cracking reaction. The gas phase is vented through a flare, while the liquid phase enters the pre-dehydration separator after passing through a low-temperature ethylene glycol heat exchanger. The pre-dehydration separator separates the oil and produced water. The oil is then treated by a thermochemical separator and enters the purified oil tank, while the produced water enters the high-temperature oil separator for further treatment via pipeline.

[0003] Existing high-temperature oil separators, such as the one with application number CN201620210032.9, entitled "A Vapor Recovery Device for Produced Liquid in the Development of Extra-Heavy Oil Huff and Puff," mainly consist of a tank, a first defoaming device, a first separation packing device, a second separation packing device, a second defoaming device, a vapor discharge device, an inlet flow stabilization device, and a sand discharge controller. The working process is as follows: Produced liquid enters the tank through the inlet nozzle. Under the action of the inlet flow stabilization device, the flow direction and velocity of the produced liquid change, and initial separation occurs. The foam in the separated liquid phase undergoes two gas-liquid separations via the first defoaming device, the first separation packing device, the second separation packing device, and the second defoaming device. The vapor phase after the second separation enters the vapor discharge device and then the vapor outlet pipe. Impurities and gravel in the produced liquid accumulate at the bottom of the tank and can be periodically discharged online through the sand discharge nozzle using the tank's operating pressure and high-pressure water flushing. However, the liquid inlet flow stabilizing device in the above patent is a cavity structure with openings at the top and bottom. A swirling baffle is installed on the inner wall of the tank between the liquid inlet nozzle and the liquid inlet flow stabilizing device. With the cooperation of the liquid inlet flow stabilizing device and the swirling baffle, the liquid separation time is extended and the incoming liquid speed is reduced.

[0004] However, the liquid inlet flow stabilizing device in the above patent is a cavity structure with openings at the top and bottom. Although it is equipped with a swirl baffle to reduce speed, the openings at the top and bottom of the cavity form a through flow channel, which cannot effectively isolate the liquid inlet disturbance. The inlet liquid will still impact the original liquid in the tank, causing the already formed oil-water gravity stratification interface to be destroyed and the oil-liquid separation efficiency to decrease. Summary of the Invention

[0005] The purpose of this invention is to provide an oil sands produced water removal device to solve the problem in the prior art where the inlet flow stabilization device cannot effectively isolate inlet disturbances, resulting in the destruction of the formed oil-water separation interface and a reduction in oil-liquid separation efficiency.

[0006] To achieve the above objectives, the basic solution provided by this invention is as follows: an oil sands produced water removal device, comprising a tank and a liquid inlet stabilization unit. The tank has a produced water inlet on its top left side. The liquid inlet stabilization unit includes a cavity with an opening at its top corresponding to the produced water inlet. An arc-shaped buffer plate and an annular baffle are provided within the cavity. The outer diameter of the arc-shaped buffer plate is equal to the inner diameter of the annular baffle. The arc-shaped buffer plate is located directly above the annular baffle. The inner side is connected to a conical hopper, the bottom of which extends to the bottom of the cavity. An overflow port is provided on one side of the cavity, located at the bottom of an annular baffle. A drain port and an emulsion oil outlet are respectively provided on the bottom right side of the tank. From left to right, a rectifier plate, a first packing gas-liquid separator, a second packing gas-liquid separator, and a baffle are arranged in sequence inside the tank. The baffle is located between the drain port and the emulsion oil outlet. The drain port is connected to a main liquid pipe, and a sampling structure for sampling is provided on the main liquid pipe.

[0007] The working principle of this invention is as follows: When the oil removal device removes oil from the produced water, the produced water first flows into the cavity through the produced water inlet on the left side of the top of the tank. After entering from the top opening of the cavity, the produced water first impacts the arc-shaped buffer plate inside the cavity. The arc-shaped structure can disperse the impact force of the water flow, initially reduce the water flow velocity, and prevent the water flow from directly and vertically impacting the liquid at the bottom of the cavity. After being slowed down by the arc-shaped buffer plate, the water flow flows along the edge of the arc-shaped buffer plate into the annular baffle below. The annular baffle and the conical bucket form a closed flow channel, guiding the water flow into the bottom of the cavity. After the water flow is guided to the bottom of the cavity by the conical bucket, the liquid level rises continuously because the space at the bottom of the cavity is closed. When the liquid level is higher than the overflow port on the side wall of the cavity, the water flows into the tank through the overflow port.

[0008] The water then flows through a rectifier plate inside the tank, which further eliminates water flow fluctuations and makes the water flow smooth. The rectified water then enters the first packing-type gas-liquid separator, where the gas phase escapes upward through the gaps in the packing. At the same time, some low-density emulsified oil droplets adhere to the surface of the packing and form larger oil droplets through the coalescence effect, which float upward with the oil phase. The water then continues to flow into the second packing-type gas-liquid separator after the first separation, which further captures the small oil droplets and gas phase remaining in the water flow. The emulsified oil droplets that were not processed by the first packing-type gas-liquid separator coalesce and float again, eventually causing the gas phase to escape upward, the oil phase to float to the upper layer of the tank, and the water phase to sink to the lower layer of the tank.

[0009] After multi-stage separation, the tank is divided into layers: the upper layer is emulsified oil, and the lower layer is water and a small amount of gravel. The water and emulsified oil are continuously discharged through the drain port and emulsified oil outlet, respectively, by the baffles inside the tank. The water is transported to the water treatment station by pump through the main liquid pipe, and the oil enters the clean oil tank through the pipeline. The water in the main liquid pipe is sampled and tested periodically through the sampling structure.

[0010] The beneficial effects of this invention are as follows: ① By using the liquid inlet flow stabilization unit structure, the traditional through-type cavity is replaced by a combination of an arc-shaped buffer plate, an annular baffle, a conical bucket, and a container. After the collected water enters from the top opening, it is first initially slowed down by the arc-shaped buffer plate, and then guided to the bottom of the container through the flow channel formed by the annular baffle and the conical bucket. Finally, it flows out smoothly from the overflow port, effectively isolating the liquid inlet disturbance, avoiding impact on the original liquid in the tank, and effectively protecting the formed oil-water gravity stratification interface, thereby improving the oil-liquid separation efficiency; ② A flow rectifier plate is set in the tank to further stabilize the liquid flow state and further realize the separation of water and emulsified oil.

[0011] Option 2, a preferred embodiment of the basic option, describes a sampling structure comprising a base plate and a circular stop plate. A bypass pipe is connected to one side of the main liquid pipe, and a circular cavity is connected to the bypass pipe. The bottom of the circular cavity is fixedly connected to the base plate, and the top of the circular cavity is open. A cover is detachably connected to the opening of the circular cavity. A sampling nozzle is connected to one side of the circular cavity, located above the bypass pipe. Two supports are provided on the cover, each with a threaded hole. Two screws are threaded into the two threaded holes, and the two screws movably penetrate the cover. Nuts are provided on each screw, and both nuts abut against the top of the supports. A worm gear is fixedly connected to the outer wall of each nut. The top of the circular stop plate is fixedly connected to the bottom of the two screws. The circular stop plate is connected to the inner wall of the circular cavity. The circular stop plate is connected in a sliding manner. A rubber sealing ring is provided on the circumference of the circular cavity where it contacts the circular stop plate. A through groove is opened on the circular cavity, and a one-way valve is installed within the groove. Two fixed seats are provided on the top of the cover. Two worm gears are connected between the two fixed seats by bearings. The ends of the two worm gears, close to each other, are fixedly connected. Each worm gear meshes with two worm wheels. A handle is provided at the end of each worm gear extending outside the fixed seat. A descaling mechanism is provided inside the circular cavity for cleaning scale buildup at the contact point between the circular stop plate and the circular cavity. The main technical problem this solution addresses is that, due to the high calcium content in the produced water in some oilfield areas, when the traditional sampling valve is not open, calcium ions in the water precipitate and form scale at the valve core, preventing the sampling valve core from closing completely and causing leakage. This necessitates replacing the sampling valve every half month, thus increasing production costs. This device, by incorporating a bypass pipe, a circular cavity, and a circular stop plate, eliminates the need to interrupt the normal infusion of the main liquid pipe during sampling. Simply turning the handle drives the worm gear and worm wheel to move the screw up and down within the circular cavity, thus controlling the opening and closing of the sampling nozzle. The circular cavity does not require prolonged contact with water, solving the major problem of frequent valve replacements.

[0012] Option 3, a preferred embodiment of Option 2, includes a descaling mechanism comprising a rotating plate with scraper heads detachably connected to both ends. A connecting rod is provided on the rotating plate. A through hole is formed on the circular stop plate, and a bearing is fixedly connected within the through hole. The connecting rod is fixedly connected to the inner ring of the bearing. One end of the connecting rod extends movably through the cover body to the outside of the cover body. Gear 1 and Gear 2 are respectively provided at the end of the connecting rod extending to the outside of the cover body. The main liquid pipe is connected to a housing, and a rotating shaft rotatably connects to the housing. The rotating shaft rotatably connects to the housing. One end is equipped with turbine blades. One end of the rotating shaft rotatably extends through the housing to the outside of the housing. A worm gear two is fixedly connected to the end of the rotating shaft extending outside the housing. A fixed seat two is provided on the base plate. One end of the worm gear two is bearing-connected to the fixed seat two. Fixed seats three and four are respectively provided on the base plate. The rotating shaft two is bearing-connected to the fixed seat three. A worm wheel two is fixedly connected to one end of the rotating shaft two. The worm wheel two meshes with the worm gear two. A worm gear three is bearing-connected to the fixed seat four. A speed reduction mechanism is provided between the worm gear three and the rotating shaft two. The reduction unit includes a fixed base five on a fixed base four, a rotating shaft three connected to a bearing on the fixed base five, one end of the rotating shaft three being connected to a bearing on the base plate, a worm gear three on the rotating shaft three meshing with a worm three, a rotating shaft four connected to a bearing on the cover body, a gear three fixedly connected to the rotating shaft four for meshing with gear one and gear two, a segmented gear at the other end of the rotating shaft three for intermittent meshing with gear three, and a valve unit for blocking and opening water flow inside the circular cavity; the housing is driven by the liquid flow in the main liquid pipe. The internal turbine blades rotate, and through the transmission of worm gear two, worm wheel two, reduction unit, worm gear three, and worm wheel three, the segmented gears intermittently mesh with gear three, which in turn drives the connecting rod to rotate the rotating plate within the circular cavity. The scrapers at both ends of the rotating plate can automatically clean the scale at the contact point between the circular stop plate and the circular cavity, eliminating the need for regular manual cleaning and preventing scale buildup from causing the circular stop plate to become immobile. The intermittent meshing design of the segmented gears ensures that the rotating plate rotates only when descaling is needed, rather than continuously, reducing frictional wear between the scrapers and the circular stop plate and cavity, and improving component durability.

[0013] Option 4, a preferred embodiment of Option 3, includes an arc-shaped plate corresponding to the arc shape of the inner wall of the circular cavity. The arc-shaped plate has a circular hole with the same inner diameter as the bypass pipe. One end of the arc-shaped plate has a sliding rod, and the inner wall of the circular cavity has a groove for the sliding rod to slide. One end of the sliding rod is detachably connected to the top of the circular stop plate. Through the linkage between the arc-shaped plate and the circular stop plate, when the circular stop plate rises or falls, the sliding rod drives the arc-shaped plate to slide within the groove. When the circular hole on the arc-shaped plate aligns with the bypass pipe, the liquid flow is opened; when misaligned, the liquid flow is closed. When sampling is required, as the circular stop plate rises, the circular hole on the arc-shaped plate misaligns with the bypass pipe, closing the liquid flow. It is not necessary to completely seal between the arc-shaped plate and the bypass pipe; simply blocking the liquid flow allows the liquid level in the circular cavity to rise. After sampling, as the circular stop plate falls, the circular hole on the arc-shaped plate aligns with the bypass pipe, causing the liquid level to drop and restoring the original liquid flow.

[0014] Option 5, a preferred embodiment of Option 3, includes an internal gear ring fixedly connected to a fixed base 3. A sun gear is located at the end of the rotating shaft 2 away from the worm gear 2. Three planetary gears mesh between the sun gear and the internal gear ring. A planetary carrier is fixedly connected to each of the three planetary gears, and the planetary carrier is fixedly connected to the worm gear 3. Using a planetary gear system as the reduction unit offers higher transmission efficiency and a more compact structure compared to traditional gear reduction. It can increase output torque while reducing rotational speed, ensuring sufficient power for the rotating plate to drive the scraper head to clean scale, and preventing scraper head jamming due to insufficient torque.

[0015] Option 6, a preferred embodiment of Option 3, has an upper surface of the circular stop plate inclined towards the sampling nozzle. After sampling, when the bottom of the circular stop plate is aligned with the sampling nozzle, the pressure inside the circular cavity gradually increases as the circular stop plate descends. At this time, the one-way valve opens, and some liquid flows into the top space of the circular stop plate through the one-way valve. Under the action of gravity, the liquid can quickly flow towards the sampling nozzle along the inclined surface, avoiding residue on the surface of the circular stop plate.

[0016] Option 7, a preferred embodiment of the basic option, is provided with a first manhole, a second manhole, and a third manhole on the top of the tank. The first manhole is located between the produced water inlet and the first packed gas-liquid separator, the second manhole is located between the first packed gas-liquid separator and the second packed gas-liquid separator, and the third manhole is located between the second packed gas-liquid separator and the emulsified oil outlet. The tank is equipped with three ladders corresponding to the first, second, and third manholes, respectively, to facilitate worker access when cleaning or maintaining the inside of the tank.

[0017] Option 8, a preferred embodiment of the basic option, features a pressure relief valve, a safety valve, a vent valve, and an oil-liquid interface meter at the top of the tank. The pressure relief valve, safety valve, and vent valve are located between the rectifier plate and the first packed-bed gas-liquid separator, respectively. The oil-liquid interface meter is located between the first packed-bed gas-liquid separator and the second packed-bed gas-liquid separator. The bottom of the tank has a first drain outlet and a second drain outlet. The first drain outlet is located between the produced water inlet and the first packed-bed gas-liquid separator, and the second drain outlet is located within the first packed-bed gas-liquid separator. Between the second packing-type gas-liquid separator; the oil-water interface meter on the top of the tank monitors the height of the oil-water stratification interface in real time; the pressure relief valve, safety valve, and vent valve on the top of the tank work together to control the pressure inside the tank; under normal operating conditions, the vent valve periodically discharges the separated gas phase; when the pressure inside the tank exceeds the first threshold, the pressure relief valve automatically opens to release pressure; if the pressure relief valve malfunctions and causes the pressure to continue to rise to the second threshold, the safety valve opens to prevent the tank from being damaged by overpressure; the first and second drain ports at the bottom of the tank open periodically to discharge the sediment and impurities deposited inside the tank.

[0018] Option 9, a preferred embodiment of Option 2, features two locking rods on the outer side of the cover, each with an arc-shaped end. Two fixing plates are located on the outer side of the circular cavity, each with a circular groove for embedding the locking rod and a limiting groove laterally connected to the circular groove. A limiting rod is slidably connected within the limiting groove, with one end extending into the circular groove. A positioning groove for engaging the limiting rod is located on one side of the locking rod. A spring is located at one end of the limiting rod, fixedly connected to the bottom of the limiting groove. A pull rod is located at one end of the limiting groove, extending movably through the spring and fixing plates to the outside of the fixing plates. After the locking rods on the outer side of the cover are embedded in the circular grooves of the fixing plates, the limiting rods automatically engage with the positioning grooves of the locking rods under the action of the springs, achieving rapid fixing of the cover and avoiding the cumbersome operation of traditional bolt connections. Disassembly only requires pulling the pull rod to release the limiting rods, improving the efficiency of cover assembly and disassembly.

[0019] Option 10, which is a preferred option of the basic option, is provided with anti-vortex plates on the drain port and the emulsion oil outlet; the anti-vortex plates on the drain port and the emulsion oil outlet can effectively eliminate the vortex formed by the excessive flow rate when the liquid is discharged, and prevent the vortex from entraining the upper layer of oil in the tank into the drain port. Attached Figure Description

[0020] Figure 1 This is a perspective view of an oil sands produced water deoiling device according to the present invention;

[0021] Figure 2 This is a top view of an oil sands produced water oil removal device according to the present invention;

[0022] Figure 3 for Figure 2 Sectional view at point AA;

[0023] Figure 4 This is a perspective view of the sampling structure in an oil sands produced water oil removal device of the present invention;

[0024] Figure 5 for Figure 4 A 3D view from another angle;

[0025] Figure 6 This is a top view of the circular cavity in an oil sands produced water deoiling device of the present invention;

[0026] Figure 7 for Figure 6 Sectional view at point BB;

[0027] Figure 8 for Figure 7 Enlarged view at point D;

[0028] Figure 9 for Figure 6 Sectional view at CC;

[0029] Figure 10 This is a cross-sectional view of the main liquid pipe in an oil sands produced water deoiling device of the present invention.

[0030] Figure 11 This is a perspective view of the rotating plate, scraper head, and connecting rod in an oil sands oil extraction water removal device according to the present invention. Detailed Implementation

[0031] The present invention will be further described in detail below through specific embodiments:

[0032] The reference numerals in the accompanying drawings include: 1. Tank body; 101. Produced water inlet; 102. Drain outlet; 103. Emulsified oil outlet; 104. Straightening plate; 105. First packed gas-liquid separator; 106. Second packed gas-liquid separator; 107. Baffle plate; 108. First manhole; 109. Second manhole; 110. Third manhole; 111. Ladder; 112. Pressure relief valve; 113. Safety valve; 114. Vent valve; 115. Oil-liquid interface meter; 116. Second... 117. Main liquid pipe; 118. First drain outlet; 119. Anti-vortex plate; 201. Cavity; 202. Arc-shaped buffer plate; 203. Annular baffle; 204. Conical hopper; 205. Overflow outlet; 301. Base plate; 302. Bypass pipe; 303. Circular cavity; 304. Cover; 305. Sampling nozzle; 306. Support; 307. Screw; 308. Nut; 309. Worm gear one; 310. Circular stop plate; 311. Rubber sealing ring; 312. Fixing 313. Socket 1; 314. Worm Gear 1; 315. Handle; 401. One-way valve; 402. Rotating plate; 403. Scraper; 404. Connecting rod; 405. Gear 2; 406. Housing; 407. Shaft 1; 408. Turbine blade; 409. Fixed seat 2; 410. Fixed seat 3; 411. Fixed seat 4; 412. Shaft 2; 413. Worm Gear 2; 414. Worm Gear 3; 415. Fixed seat 5; 416. Shaft 3; 417. Worm Gear 3; 4 18. Shaft 4; 419. Gear 3; 420. Segmented gear; 421. Internal gear ring; 422. Sun gear; 423. Planet gear; 424. Planet carrier; 425. Strip groove; 426. Worm gear 2; 501. Arc plate; 502. Circular hole; 503. Sliding rod; 504. Slide groove; 601. Locking rod; 602. Fixing plate; 603. Circular groove; 604. Limiting groove; 605. Limiting rod; 606. Positioning groove; 607. Spring; 608. Pulling rod.

[0033] like Figures 1 to 11As shown: An oil sands produced water removal device includes a tank 1 and an inlet flow stabilization unit. The bottom of the tank 1 is provided with a saddle for support. The top left side of the tank 1 is connected to a produced water inlet 101. The inlet flow stabilization unit includes a cavity 201. The top of the cavity 201 has an opening corresponding to the produced water inlet 101. An arc-shaped buffer plate 202 is fixedly connected to the cavity 201 by four support rods. An annular baffle 203 is fixedly connected to the inner side of the cavity 201. The outer diameter of the arc-shaped buffer plate 202 is equal to the inner diameter of the annular baffle 203. The arc-shaped buffer plate 202 is located directly above the annular baffle 203. A conical bucket 204 is connected to the inner side of the annular baffle 203. The bottom of the conical bucket 204 extends to the bottom of the cavity 201 and is connected to the bottom of the cavity 201. The tank 1 has a gap, and an overflow port 205 is opened on one side of the cavity 201. The overflow port 205 is located at the bottom of the annular baffle 203. The bottom right side of the tank body 1 is connected to the drain port 102 and the emulsion oil outlet 103. Inside the tank body 1, from left to right, a rectifier plate 104, a first packed gas-liquid separator 105, a second packed gas-liquid separator 106, and a baffle plate 107 are fixedly connected. The packing of the first packed gas-liquid separator 105 and the second packed gas-liquid separator 106 is stainless steel corrugated packing. The baffle plate 107 is located between the drain port 102 and the emulsion oil outlet 103. The top of the tank body 1 is equipped with a first manhole 108, a second manhole 109, and a third manhole 110. The first manhole 108 is located between the produced water inlet 101 and the first packed gas-liquid separator 106. Between the gas-liquid separators 105, the second manhole 109 is located between the first packed gas-liquid separator 105 and the second packed gas-liquid separator 106, and the third manhole 110 is located between the second packed gas-liquid separator 106 and the emulsified oil outlet 103. The tank body 1 is equipped with three ladders 111 corresponding to the first manhole 108, the second manhole 109, and the third manhole 110, respectively. The top of the tank body 1 is equipped with a pressure relief valve 112, a safety valve 113, a vent valve 114, and an oil-liquid interface meter 115. The pressure relief valve 112, safety valve 113, and vent valve 114 are located between the rectifier plate 104 and the first packed gas-liquid separator 105, respectively, and the oil-liquid interface meter 115 is located between the first packed gas-liquid separator 105 and the second packed gas-liquid separator 106. Between points 6 and 6, tank 1 is also equipped with steps for climbing to the top of the tank. The top of the tank is equipped with a platform and a railing. The bottom of tank 1 is connected to a first drain outlet 118 and a second drain outlet 116. The first drain outlet 118 is located between the produced water inlet 101 and the first packing gas-liquid separator 105. The second drain outlet 116 is located between the first packing gas-liquid separator 105 and the second packing gas-liquid separator 106. The side wall of tank 1 is equipped with a low level gauge and a high level gauge, which are electrically connected to electric valves on drain outlet 102 and emulsion oil outlet 103. The bottom of tank 1 is equipped with an electrostatic grounding plate. Anti-vortex plates 119 are fixedly connected to drain outlet 102 and emulsion oil outlet 103. Drain outlet 102 is connected to the main liquid pipe 117.The main liquid pipe 117 is equipped with a sampling structure for sampling, and a protective cover for protection is detachably connected to the sampling structure;

[0034] The sampling structure includes a base plate 301 and a circular stop plate 310. A bypass pipe 302 is connected to one side of the main liquid pipe 117. The bypass pipe 302 is parallel to the ground. A circular cavity 303 is connected to the bypass pipe 302. The bottom of the circular cavity 303 is fixedly connected to the base plate 301. The top of the circular cavity 303 is open. A cover 304 is detachably connected to the opening of the circular cavity 303. Two locking rods 601 are fixed to the outside of the cover 304. Two fixing plates 602 are fixedly connected to the outside of the circular cavity 303. Each fixing plate 602 has a circular groove 603 for embedding the locking rods 601. A limiting groove 604 is provided, which is laterally connected to the circular groove 603. A limiting rod 605 is slidably connected in the limiting groove 604. One end of the limiting rod 605 extends into the circular groove 603. A positioning groove 606 is provided on one side of the locking rod 601 for engaging the limiting rod 605. The end of each locking rod 601 near the limiting rod 605 is arc-shaped. A spring 607 is fixedly connected to one end of the limiting rod 605. One end of the spring 607 is fixedly connected to the bottom of the limiting groove 604. A pull rod 608 is fixedly connected to one end of the limiting groove 604. One end of the pull rod 608 extends movably through the spring 607 and the fixing plate 602 to the outside of the fixing plate 602.

[0035] A sampling nozzle 305 is connected to one side of the circular cavity 303. The sampling nozzle 305 is located above the bypass pipe 302. Two supports 306 are fixedly connected to the cover 304. Each support 306 has a threaded hole, and two screws 307 are threadedly connected to the two threaded holes. The two screws 307 movably pass through the cover 304. Nuts 308 are threadedly connected to each screw 307. The bottom of each nut 308 abuts against the top of the two supports 306. A worm gear 309 is fixedly connected to the outer wall of each nut 308. The top of the circular stop plate 310 is fixedly connected to the bottom of the two screws 307. The circular stop plate 310 is slidably connected to the inner wall of the circular cavity 303. A rubber sealing ring 311 is provided on the periphery of the contact area. A through groove is opened on the circular cavity 303, and a one-way valve 315 is provided in the through groove. The upper surface of the circular stop plate 310 is inclined towards the sampling nozzle 305. Two fixed seats 312 are fixedly connected to the top of the cover 304. Two worm gears 313 are connected between the two fixed seats 312 by bearings. The two worm gears 313 are fixedly connected at their close ends. The two worm gears 313 are respectively engaged with two worm wheels 309. A handle 314 is fixedly connected to the end of each worm gear 313 that extends outside the fixed seat 312. The handle 314 has anti-slip texture. A descaling mechanism is provided in the circular cavity 303 for cleaning the scale at the contact area between the circular stop plate 310 and the circular cavity 303.

[0036] The descaling mechanism includes a rotating plate 401, with scraper heads 402 detachably connected to both ends of the rotating plate 401. The rotating plate 401 has strip-shaped through slots 425 at both ends for embedding the scraper heads 402. The scraper heads 402 are bolted to the rotating plate 401. A connecting rod 403 is fixedly connected to the rotating plate 401. A through hole is opened on the circular stop plate 310, and a bearing is fixedly connected inside the through hole. The connecting rod 403 is fixedly connected to the inner ring of the bearing. One end of the connecting rod 403 extends movably through the cover 304 to the outside of the cover 304. Gear 1 404 and Gear 2 405 are fixedly connected to the end of the connecting rod 403 extending outside the cover 304, respectively. A water pump is provided at the far end of the main liquid pipe 117 away from the tank 1, allowing the liquid to flow rapidly. The liquid pressure in the main liquid pipe 117 is 0.25 MPa. The main liquid pipe 117, near the inlet of the bypass pipe 302, is connected to a housing 406. A rotating shaft 407 is rotatably connected inside the housing 406. A turbine blade 408 is fixedly connected to one end of the rotating shaft 407 inside the housing 406. The bottom of the main liquid pipe 117 near the water inlet of the housing 406 is sloped to facilitate water flow onto the turbine blade 408. One end of the rotating shaft 407 rotatably extends through the housing 406 to the outside of the housing 406. A worm gear 426 is fixedly connected to the end of the rotating shaft 407 extending outside the housing 406. A fixed seat 409 is fixedly connected to the base plate 301. One end of the worm gear 426 is connected to the fixed seat 409 by a bearing. Fixed base 301 is fixedly connected to fixed base 3 410 and fixed base 411 respectively. Fixed base 3 410 is connected to rotating shaft 2 412 by bearing. One end of rotating shaft 2 412 is fixedly connected to worm gear 2 413, which meshes with worm 2 426. Fixed base 411 is connected to worm 3 414 by bearing. A reduction unit for speed reduction is provided between worm 3 414 and rotating shaft 2 412. The reduction unit includes an internal gear ring 421, which is fixedly connected to fixed base 3 410. The end of rotating shaft 2 412 away from worm gear 2 413 is fixedly connected to sun gear 422. Three planet gears 423 mesh between sun gear 422 and internal gear ring 421. A planetary carrier 424 is fixedly connected to the center of planetary gear 423. The planetary carrier 424 is fixedly connected to worm gear 414. A fixed seat 415 is horizontally fixedly connected to fixed seat 411. A rotating shaft 416 is connected to fixed seat 415 by a bearing. One end of the rotating shaft 416 is connected to the base plate 301 by a bearing. A worm gear 417 is fixedly connected to the rotating shaft 416, and the worm gear 417 meshes with worm gear 414. A rotating shaft 418 is connected to the cover 304 by a bearing. A gear 419 for meshing gear 404 and gear 405 is fixedly connected to the rotating shaft 418. The other end of the rotating shaft 416 is fixedly connected to the intermittently meshing gear 419. The segmented gear 420 has half the number of teeth as gear 419. The ratio of toothed to toothless segments in the total outer diameter of the segmented gear 420 is 1:10. A valve unit for blocking and opening water flow is provided within the circular cavity 303. The valve unit includes an arc-shaped plate 501 corresponding to the arc shape of the inner wall of the circular cavity 303. A circular hole 502 with the same inner diameter as the bypass pipe 302 is opened on the arc-shaped plate 501. A sliding rod 503 is fixedly connected to one end of the arc-shaped plate 501. A groove 504 for sliding the sliding rod 503 is opened on the inner wall of the circular cavity 303. One end of the sliding rod 503 is bolted to the top of the circular stop plate 310.

[0037] The implementation method of this embodiment is as follows: When the oil removal device removes oil from the produced water, the produced water first flows into the cavity 201 through the produced water inlet 101 on the top left side of the tank 1. After entering from the top opening of the cavity 201, the produced water first impacts the arc-shaped buffer plate 202 inside the cavity 201. The arc-shaped structure disperses the water flow, preventing the water flow from directly and vertically impacting the liquid at the bottom of the cavity 201. The dispersed water flow flows along the edge of the arc-shaped buffer plate 202 into the annular baffle 203 below. The annular baffle 203 and the conical hopper 204 guide the water flow into... At the bottom of the cavity 201, water flows through the conical hopper 204 and is guided to the bottom of the cavity 201. The bottom of the cavity 201 is closed, and the liquid level inside the cavity 201 continuously rises. When the liquid level is higher than the overflow port 205 on the side wall of the cavity 201, the water flows into the tank 1 through the overflow port 205. Then, the water flows through the rectifier plate 104 inside the tank 1, which further eliminates water flow fluctuations. The rectified water flows into the first packed gas-liquid separator 105, where the gas phase escapes upward through the gaps in the packing, while some of the less dense phases escape. Emulsified oil droplets adhere to the surface of the packing material, forming larger droplets through coalescence. These droplets rise with the oil phase and then flow into the second packing-type gas-liquid separator 106 after passing through the first packing-type gas-liquid separator 105. This further captures the remaining tiny oil droplets and gas phase in the water flow. The oil droplets that are not coalesced and rise again after passing through the first packing-type gas-liquid separator 105, ultimately causing the gas phase to escape upwards, the oil phase to rise to the upper layer inside the tank 1, and the water phase to sink to the lower layer inside the tank 1. The oil-water interface meter 115 at the top of the tank 1 monitors the oil-water stratification interface in the tank in real time. The pressure relief valve 112, safety valve 113, and vent valve 114 at the top of tank 1 work together to control the pressure inside tank 1. Under normal operating conditions, the vent valve 114 periodically discharges the separated gas phase. When the pressure inside tank 1 exceeds the first threshold, the pressure relief valve 112 automatically opens to release pressure. If the pressure relief valve 112 malfunctions and causes the pressure to continue to rise to the second threshold, the safety valve 113 opens to prevent tank 1 from being damaged by overpressure. The first drain port 118 and the second drain port 116 at the bottom of tank 1 open periodically to discharge the silt and impurities deposited inside tank 1.

[0038] After multi-stage separation, the tank 1 is divided into layers: the upper layer is an oil layer (emulsified oil), and the lower layer is water and a small amount of sand and gravel. The water and emulsified oil are continuously discharged through the drain port 102 and the emulsified oil outlet 103, respectively, after overflowing through the baffle 107 in the tank 1. The water is transported to the water treatment station through the main liquid pipe 117 and the water pump, while the oil enters the clean oil tank through the pipeline.

[0039] The water in the main liquid pipe 117 needs to be sampled and tested periodically. During sampling, the operator turns handle 314, causing the worm gear 313 to rotate. The worm gear 313 meshes with the worm wheel 309, driving the worm wheel 309 to rotate the nut 308. Because the nut 308 is limited by the bracket 306, when the nut 308 rotates, the screw 307 threadedly connected to the nut 308 moves upward. When the screw 307 moves upward, it causes the circular stop plate 310 at the bottom of the screw 307 to slide upward within the circular cavity 303. The rubber sealing ring 31... 1. Ensure the circular stop plate 310 is sealed to the inner wall of the circular cavity 303. Simultaneously, the sliding rod 503 at the top of the circular stop plate 310 slides upward along the groove 504 on the inner wall of the circular cavity 303, causing the arc plate 501 to move upward synchronously. When the circular stop plate 310 rises to the point where its bottom is flush with the upper surface of the sampling nozzle 305 (i.e., the sampling nozzle 305 is fully opened), the circular hole 502 on the arc plate 501 is completely misaligned with the bypass pipe 302, and the water flow at the outlet of the bypass pipe 302 is blocked. At this time, the circular stop plate 310... A closed space is formed inside the circular cavity 303. The liquid in the main liquid pipe 117 continues to flow into the circular cavity 303 through the inlet end of the bypass pipe 302, causing the liquid level in the circular cavity 303 to gradually rise. When the liquid level is higher than the sampling nozzle 305, the water flows out through the sampling nozzle 305 and is collected by the container for sampling. After sampling is completed, the handle 314 is rotated in the opposite direction, and the screw 307 drives the circular stop plate 310 to return to its original position. When the bottom of the circular stop plate 310 is flush with the upper surface of the sampling nozzle 305 (that is, when the sampling nozzle 305 is completely closed), the liquid level is lowered. As the circular stop plate 310 descends, the pressure inside the circular cavity 303 gradually increases. At this time, the one-way valve 315 opens, and some liquid flows into the top space of the circular stop plate 310 through the one-way valve 315. The liquid can flow quickly along the inclined surface to the sampling nozzle 305 under the action of gravity and be discharged, avoiding residue on the surface of the circular stop plate 310. When the circular hole 502 of the arc plate 501 is aligned with the bypass pipe 302 again, the circulation of the bypass pipe 302 is restored, the pressure inside the circular cavity 303 decreases, and the one-way valve 315 closes.

[0040] To address the issue of high calcium content in produced water in some oilfield areas, which easily leads to scaling at the contact point between the circular stop plate 310 and the inner wall of the circular cavity 303, an intermittent descaling mechanism is implemented: When water flows in the main liquid pipe 117, the water flows through the housing 406 and impacts the turbine blades 408 inside the housing 406, causing the turbine blades 408 to rotate. The turbine blades 408 drive the worm gear 426 to rotate via the first rotating shaft 407. The worm gear 426 meshes with the worm wheel 413, transmitting power to the second rotating shaft 412. The second rotating shaft 412 drives the sun gear 422 at its end to rotate. The sun gear 422 drives the planet carrier 424 to rotate via three planet gears 423, reducing the rotational speed of the planet carrier 424. The planet carrier 424 then drives the worm gear 414 to rotate. 4. It meshes with worm gear 3 417, which drives shaft 3 416 to rotate. Shaft 3 416 drives segmented gear 420 at its end to rotate. The toothed section of segmented gear 420 meshes with gear 3 419, driving gear 3 419 to rotate. Gear 3 419 meshes with gear 1 404 and gear 2 405. Gear 2 405 drives connecting rod 403 to rotate. Connecting rod 403 drives rotating plate 401 at its bottom to rotate. Scraper heads 402 at both ends of rotating plate 401 are in close contact with circular stop plate 310 and circular cavity 303, thereby scraping off the scale. The toothed and toothless sections of segmented gear 420 mesh alternately, driving rotating plate 401 to rotate half a turn intermittently, which ensures scale removal and avoids wear caused by continuous friction of scraper heads 402.

[0041] The first manhole 108, the second manhole 109, and the third manhole 110 on the top of the tank 1 can be opened respectively. Operators can enter and exit the tank 1 for maintenance through the ladders 111 inside the tank 1 that correspond to the first manhole 108, the second manhole 109, and the third manhole 110 respectively.

[0042] The cover 304 of the sampling structure can be quickly disassembled and assembled via the locking rod 601 and the limiting rod 605. During disassembly, pulling the pulling rod 608 causes the limiting rod 605 to compress the spring 607 and exit the positioning groove 606 of the locking rod 601, allowing the cover 304 to be lifted upwards for easy replacement of the scraper head 402 or maintenance of the circular stop plate 310. During installation, the locking rod 601 is embedded in the circular groove 603 of the fixing plate 602, and the limiting rod 605 automatically engages with the positioning groove 606 under the action of the spring, completing the installation.

[0043] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An oil sands produced water oil removal device, characterized in that, The system includes a tank (1) and a liquid inlet flow stabilization unit. The tank (1) has a produced water inlet (101) on the top left side. The liquid inlet flow stabilization unit includes a cavity (201). The top of the cavity (201) has an opening corresponding to the produced water inlet (101). The cavity (201) has an arc-shaped buffer plate (202) and an annular baffle (203). The outer diameter of the arc-shaped buffer plate (202) is equal to the inner diameter of the annular baffle (203). The arc-shaped buffer plate (202) is located directly above the annular baffle (203). The inner side of the annular baffle (203) is connected to a conical bucket (204). The bottom of the conical bucket (204) extends to the bottom of the cavity (201). The container (201) has an overflow port (205) on one side, which is located at the bottom of the annular baffle (203). The bottom right side of the tank (1) has a drain port (102) and an emulsion oil outlet (103). The tank (1) has a rectifier plate (104), a first packing gas-liquid separator (105), a second packing gas-liquid separator (106), and a baffle plate (107) arranged from left to right. The baffle plate (107) is located between the drain port (102) and the emulsion oil outlet (103). The drain port (102) is connected to a main liquid pipe (117). The main liquid pipe (117) is provided with a sampling structure for sampling, which includes a bottom plate (301). A circular stop plate (310) is provided. A bypass pipe (302) is connected to one side of the main liquid pipe (117). A circular cavity (303) is connected to the bypass pipe (302). The bottom of the circular cavity (303) is fixedly connected to the base plate (301). The top of the circular cavity (303) is open. A cover (304) is detachably connected to the opening of the circular cavity (303). A sampling nozzle (305) is connected to one side of the circular cavity (303). The sampling nozzle (305) is located above the bypass pipe (302). Two supports (306) are provided on the cover (304). Threaded holes are opened on both supports (306). Two screws are threaded into the two threaded holes. The rod (307) has two screws (307) that movably pass through the cover (304). Each screw (307) is provided with a nut (308). Both nuts (308) abut against the top of the bracket (306). A worm gear (309) is fixedly connected to the outer wall of each nut (308). The top of the circular stop plate (310) is fixedly connected to the bottom of the two screws (307). The circular stop plate (310) is slidably connected to the inner wall of the circular cavity (303). A rubber sealing ring (311) is provided on the periphery where the circular stop plate (310) contacts the circular cavity (303). A through groove is opened on the circular cavity (303). A one-way valve (315) is provided in the through groove.The top of the cover (304) is provided with two fixed seats (312), and two worm gears (313) are connected between the two fixed seats (312) by bearings. The two worm gears (313) are fixedly connected at their close ends. The two worm gears (313) mesh with two worm wheels (309) respectively. Each worm gear (313) has a handle (314) at its end extending outside the fixed seat (312). The circular cavity (303) is provided with a descaling mechanism for cleaning the scale at the contact point between the circular stop plate (310) and the circular cavity (303). The circular cavity (303) is also provided with a descaling mechanism for cleaning the scale at the contact point between the circular stop plate (310) and the circular cavity (303). A valve unit for blocking and opening water flow includes an arc-shaped plate (501) corresponding to the arc shape of the inner wall of a circular cavity (303). The arc-shaped plate (501) has a circular hole (502) with the same inner diameter as the bypass pipe (302). One end of the arc-shaped plate (501) has a sliding rod (503). The inner wall of the circular cavity (303) has a groove (504) for sliding the sliding rod (503). One end of the sliding rod (503) is detachably connected to the top of a circular stop plate (310). The upper surface of the circular stop plate (310) is inclined towards the sampling nozzle (305).

2. The oil removal device for oil sands produced water according to claim 1, characterized in that, The descaling mechanism includes a rotating plate (401), with scraper heads (402) detachably connected to both ends of the rotating plate (401). A connecting rod (403) is provided on the rotating plate (401). A through hole is opened on the circular stop plate (310), and a bearing is fixedly connected inside the through hole. The connecting rod (403) is fixedly connected to the inner ring of the bearing. One end of the connecting rod (403) extends movably through the cover (304) to the outside of the cover (304). The end of the connecting rod (403) extending to the outside of the cover (304) is respectively provided with a gear one (404) and a gear two (405). The main liquid pipe (117) is connected to a housing (406). A rotating shaft (407) is rotatably connected inside the housing (406). One end of the rotating shaft (407) inside the housing (406) is provided with a turbine blade (408). One end of the rotating shaft (407) rotatably extends through the housing (406) to the outside of the housing (406). The end of the rotating shaft (407) extending to the outside of the housing (406) is fixedly connected to a worm gear (426). A fixed seat (409) is provided on the base plate (301). One end of the worm gear (426) is bearing the fixed seat (409). The base plate (301) is provided with a fixed seat three (410) and a fixed seat four (411). A rotating shaft two (412) is connected to a bearing on the fixed seat three (410). A worm gear two (413) is fixedly connected to one end of the rotating shaft two (412). The worm gear two (413) meshes with a worm two (426). A worm three (414) is connected to a bearing on the fixed seat four (411). A speed reduction unit for deceleration is provided between the worm three (414) and the rotating shaft two (412). A fixed seat five (415) is provided on the fixed seat four (411). (415) The upper bearing is connected to the rotating shaft three (416), one end of the rotating shaft three (416) is connected to the bearing of the base plate (301), the rotating shaft three (416) is provided with the worm gear three (417), the worm gear three (417) and the worm three (414) mesh, the upper bearing of the cover (304) is connected to the rotating shaft four (418), the rotating shaft four (418) is fixedly connected with the gear three (419) for meshing gear one (404) and gear two (405), the other end of the rotating shaft three (416) is provided with the segmented gear (420) for intermittently meshing gear three (419).

3. The oil removal device for oil sands produced water according to claim 2, characterized in that, The reduction unit includes an internal gear ring (421), which is fixedly connected to the fixed seat three (410). The end of the rotating shaft two (412) away from the worm gear two (413) is provided with a sun gear (422). Three planet gears (423) mesh between the sun gear (422) and the internal gear ring (421). A planet carrier (424) is fixedly connected to the three planet gears (423). The planet carrier (424) is fixedly connected to the worm gear three (414).

4. The oil removal device for produced water from oil sands according to claim 1, characterized in that, The top of the tank (1) is provided with a first manhole (108), a second manhole (109) and a third manhole (110). The first manhole (108) is located between the produced water inlet (101) and the first packing gas-liquid separator (105). The second manhole (109) is located between the first packing gas-liquid separator (105) and the second packing gas-liquid separator (106). The third manhole (110) is located between the second packing gas-liquid separator (106) and the emulsified oil outlet (103). The tank (1) is provided with three ladders (111) corresponding to the first manhole (108), the second manhole (109) and the third manhole (110) respectively.

5. The oil removal device for produced water from oil sands according to claim 1, characterized in that, The top of the tank (1) is provided with a pressure relief valve (112), a safety valve (113), a vent valve (114), and an oil-liquid interface meter (115). The pressure relief valve (112), the safety valve (113), and the vent valve (114) are located between the rectifier plate (104) and the first packing gas-liquid separator (105), respectively. The oil-liquid interface meter (115) is located between the first packing gas-liquid separator (105) and the second packing gas-liquid separator (106). The bottom of the tank (1) is provided with a first drain outlet (118) and a second drain outlet (116). The first drain outlet (118) is located between the produced water inlet (101) and the first packing gas-liquid separator (105), and the second drain outlet (116) is located between the first packing gas-liquid separator (105) and the second packing gas-liquid separator (106).

6. The oil removal device for produced water from oil sands according to claim 1, characterized in that, The outer side of the cover (304) is provided with two locking rods (601), one end of each locking rod (601) is arc-shaped. The outer side of the circular cavity (303) is provided with two fixing plates (602), each fixing plate (602) has a circular groove (603) for embedding the locking rod (601), and each fixing plate (602) has a limiting groove (604) that is laterally connected to the circular groove (603). A limiting rod (605) is slidably connected in the limiting groove (604). One end of the locking rod (605) extends into the circular groove (603). A positioning groove (606) for engaging the limiting rod (605) is opened on one side of the locking rod (601). A spring (607) is provided at one end of the limiting rod (605). One end of the spring (607) is fixedly connected to the bottom of the limiting groove (604). A pull rod (608) is provided at one end of the limiting groove (604). One end of the pull rod (608) extends movably through the spring (607) and the fixing plate (602) to the outside of the fixing plate (602).

7. The oil removal device for produced water from oil sands according to claim 1, characterized in that, Anti-vortex plates (119) are provided on the drain port (102) and the emulsified oil outlet (103).

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