Graphene reinforced oilfield single well produced water reinjection treatment equipment and method

Abstract

The invention discloses graphene reinforced oilfield single well produced water reinjection treatment equipment and method, and relates to the technical field of oilfield produced water reinjection treatment.The graphene reinforced oilfield single well produced water reinjection treatment equipment comprises a treatment box body, and a first partition plate and a second partition plate are fixedly arranged in the treatment box body at intervals; the first partition plate and the box wall of the treatment box body are enclosed to form a settling cavity for settling produced water, the first partition plate, the second partition plate and the box wall of the treatment box body are enclosed to form a separation cavity for oil-water separation, and the second partition plate and the box wall of the treatment box body are enclosed to form a drainage cavity for drainage; a separation cavity is formed in the treatment box body, four groups of rotating rollers are rotationally distributed in the separation cavity in a rectangular array manner, one group of rotating rollers is fixed to the output end of a servo motor fixedly distributed on the outer side wall of the treatment box body, and the four groups of rotating rollers are sleeved with graphene films. And a backwashing effect can be achieved on the graphene film at the position of the lower die.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield produced water reinjection treatment, and in particular to graphene-enhanced oilfield single-well produced water reinjection treatment equipment and method. Background Art

[0002] During oilfield production, produced water, the water extracted from the well along with the crude oil, is called produced water. This water often contains oil, solid particles, and chemical contaminants. Treatment equipment is required to treat this produced water to meet the standards for reinjection into the underground oil formation. Reinjecting treated produced water into the oil formation replenishes formation energy, maintains oilfield production pressure, and increases oil recovery. Without effective treatment, produced water will cause environmental pollution and fail to meet reinjection standards.

[0003] In the existing technology, graphene membranes are usually used to separate oil and water in produced water. However, in actual applications, when the graphene membrane is used for a long time, oil molecules or tiny oil droplets will adsorb or block the entrance / interior of the nanochannel. Especially when dealing with high-concentration, viscous or surfactant-containing emulsions, the surfactant will promote the adhesion of oil droplets on the membrane, seriously hindering the penetration of the oil phase. Summary of the Invention

[0004] The present invention provides a graphene-enhanced oilfield single-well produced water reinjection treatment device and method, which can solve the following problems existing in the prior art: After long-term use, oil molecules or tiny oil droplets in current graphene membranes will be adsorbed on the surface of the graphene sheets or block the entrance / interior of the nanochannels, hindering the penetration of oil.

[0005] A graphene-enhanced oilfield single-well produced water reinjection treatment device includes a treatment box body, wherein a first baffle and a second baffle are fixedly arranged at intervals in the treatment box body, the first baffle and the box wall of the treatment box body enclosing a settling chamber for settling produced water, the first baffle and the second baffle and the box wall of the treatment box body enclosing a separation chamber for oil-water separation, and the second baffle and the box wall of the treatment box body enclosing a hydrophobic chamber for drainage; Four groups of rollers are arranged in a rectangular array in the separation chamber for rotation, one group of rollers is fixed to the output end of a servo motor arranged on the outer wall of the processing box, and the four groups of rollers are covered with graphene membranes; Among them, the graphene membrane is enclosed to form an upper mold, a lower mold and two groups of side membranes, one group of side membranes is slidingly fitted with the first partition, and the other group of side membranes is slidingly fitted with the second partition. The lower mold and the bottom wall of the processing box are enclosed to form an oil storage cavity, and the setting position of the upper mold is higher than the second partition and lower than the first partition.

[0006] Preferably, a first groove is formed on a side of the first separator facing the second separator, wherein two groups of rollers are respectively rotatably arranged in the first groove, and the graphene film is slidably fitted with the groove wall of the first groove.

[0007] Preferably, the box walls of the processing box on both sides of the separation chamber are respectively provided with second grooves, and each roller extends into the second groove and is rotatably connected to its groove wall, and the two side edges of the graphene membrane synchronously extend into the second groove and slide in contact with its groove wall.

[0008] Preferably, an oil storage tank is further provided on the outside of the processing box body, and an oil drain pipe is provided on one side of the oil storage cavity, and the oil drain pipe extends into the oil storage tank.

[0009] Preferably, an oil storage tank is fixedly arranged on the outside of the processing box body, the oil storage tank is connected to the oil pump through an oil pipeline, the other end of the oil pump is connected to the oil extraction pipe, and the oil extraction pipe extends into the oil storage tank.

[0010] Preferably, a water storage tank is arranged outside the treatment box body, and the water storage tank is connected to the hydrophobic cavity through two sets of water pipes; Wherein, an air supply pipe is provided on one side of the water tank, and the air supply pipe is connected to the ozone generating device for inputting ozone into the water tank.

[0011] Preferably, the upper mold, the lower mold and the two sets of side membranes are enclosed in the separation chamber to form an air delivery cavity, and an air pump is fixedly arranged on the outside of the processing box. One side of the air pump is connected to the air inlet pipe, and the other end of the air inlet pipe is connected to the ozone generator. The other end of the air pump is connected to the air delivery cavity through the air port.

[0012] Preferably, through grooves are respectively provided on the box walls on both sides of the bottom of the sedimentation chamber, and a first collecting box is slidably embedded in the through grooves. The first collecting box is fixedly connected to the second collecting box arranged on the outside of the processing box body through a connecting plate. The structural dimensions of the first collecting box and the second collecting box are the same. Baffles are fixedly arranged on the box walls outside the through grooves on both sides, and the lower surface of the baffle is slidably fitted with the upper surface of the collecting box. A driving mechanism is also fixedly arranged on the outside of the processing box body, and the driving mechanism is used to drive the first collecting box and the second collecting box to slide in the through grooves.

[0013] Preferably, the first collection box and the second collection box respectively include two groups of side panels, and the side panels are symmetrically fixed on both sides of the connecting plate, and a bottom plate is slidably embedded at the bottom of the side panels on both sides, and a limiting plate is fixedly arranged on one end of the bottom plate away from the connecting plate, wherein a sliding groove is provided at one end of the side panels on both sides close to the limiting plate, and a sliding seat is fixedly arranged on the limiting plate and slidably embedded in the sliding groove.

[0014] A graphene-enhanced oilfield single-well produced water reinjection treatment method, applied to the above-mentioned graphene-enhanced oilfield single-well produced water reinjection treatment equipment, comprises the following steps: Inputting the pretreated produced water into the sedimentation chamber; When the water level in the sedimentation chamber is flush with the top of the first baffle, as the produced water continues to be input, the water in the sedimentation chamber will overflow the chamber and flow along the top of the first baffle to the upper mold of the graphene membrane; The graphene membrane is driven by a servo motor and a roller to slowly rotate along the direction of the water flow. During the rotation process, the produced water is driven to flow toward the hydrophobic cavity. The oil in the produced water will penetrate and pass through the upper mold to fall onto the lower mold, and finally pass through the lower mold to fall into the oil storage cavity. The separated water cannot pass through the upper die and is transported to the hydrophobic cavity under the transmission action of the upper die to achieve oil-water separation.

[0015] The present invention provides a graphene-enhanced oilfield single-well produced water reinjection treatment device and method, which has the following beneficial effects: 1) The present invention first inputs the pretreated produced water into the sedimentation chamber. When the water level in the sedimentation chamber is flush with the top of the first baffle, as the produced water continues to be input, the water in the sedimentation chamber will overflow the chamber and flow along the top of the first baffle to the upper mold of the graphene membrane. The present invention drives the graphene membrane to slowly transmit along the direction of the water flow through the servo motor and the roller. During the transmission process, the produced water can be driven to flow toward the hydrophobic cavity. During the flow process, the oil in the produced water will penetrate and pass through the upper mold and fall onto the lower mold until it passes through the lower mold and falls into the oil storage chamber, while the separated water has no The oil passes through the upper die and is transported to the hydrophobic cavity under the transmission action of the upper die. During the oil-water separation process of the present invention, the servo motor can drive the roller to rotate in real time, and the upper die in the initial position will rotate to the lower die. Due to a certain height difference between the upper die and the lower die, when the oil falls from the upper die to the lower die, it will have a backwashing effect on the graphene membrane in the lower die position, thereby clearing the oil originally blocked at the entrance / interior of the nanochannel to avoid affecting its oil-water separation effect. This reciprocating process can ensure that the graphene membrane is always in a high-efficiency oil-liquid separation state. 2) In the present invention, the two side edges of the graphene membrane are slidably fitted with the groove wall of the second groove to ensure the sealing between the two side edges of the graphene membrane and the wall of the treatment box, thereby preventing the produced water from leaking through the gap between the two side edges of the graphene membrane and the wall of the treatment box; 3) In the initial state of the present invention, the first collecting box is embedded in the sedimentation chamber. Since the two side walls of the first collecting box are sealed to the through groove, the produced water immersed in the sedimentation chamber will not leak from the through groove, thereby ensuring the sealing effect. At this time, the impurity particles in the produced water can be settled in the first collecting box. After collecting for a period of time, the present invention can drive the first collecting box along the through groove to the outside of the sedimentation chamber through the driving mechanism. At this time, the second collecting box can move along the through groove to the sedimentation chamber. During the movement, based on the sealing effect of the baffle on the first collecting box, the separated water will not leak. When the first collecting box is completely pulled out, the second collecting box just moves to the sedimentation chamber to exchange the positions of the first collecting box and the second collecting box, and clean the impurities collected in the first collecting box for collection again. This reciprocating process allows the present invention to clean the settled impurity particles without stopping the machine, thereby ensuring the normal operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic top view of a graphene-enhanced oilfield single-well produced water reinjection treatment device provided by the present invention; Figure 2 Schematic diagram of the three-dimensional structure of a graphene-enhanced oilfield single-well produced water reinjection treatment equipment provided by the present invention Figure 1 ; Figure 3 Schematic diagram of the three-dimensional structure of a graphene-enhanced oilfield single-well produced water reinjection treatment equipment provided by the present invention Figure 2 ; Figure 4 A schematic diagram of the internal structure of a treatment box in a graphene-enhanced oilfield single-well produced water reinjection treatment device provided by the present invention; Figure 5 A schematic cross-sectional view of a treatment box in a graphene-enhanced oilfield single-well produced water reinjection treatment device provided by the present invention; Figure 6 A schematic structural diagram of a collection box in a graphene-enhanced oilfield single-well produced water reinjection treatment device provided by the present invention; Figure 7 A schematic cross-sectional view of a graphene-enhanced oilfield single-well produced water reinjection treatment device provided by the present invention; Figure 8 For the present invention Figure 6 Schematic diagram of the structure of the enlarged part at A.

[0017] Description of reference numerals: 1. Processing box; 2. Air port; 3. Water storage tank; 4. Oil storage tank; 5. Servo motor; 6. Through groove; 7. Second groove; 101. Sedimentation chamber; 102. First baffle; 103. Second baffle; 104. Separation chamber; 105. Drain chamber; 106. Water pipe; 107. First water inlet pipe; 108. Second water inlet pipe; 301. Air pipe; 302. Air inlet pipe; 303. Air pump; 401. Oil storage tank; 402. Oil pump; 403. Oil outlet pipe; 404 , oil pipeline; 405, oil extraction pipe; 406, oil discharge pipe; 501, graphene membrane; 502, roller; 503, upper mold; 504, lower mold; 505, side mold; 506, oil storage chamber; 601, baffle; 602, driving mechanism; 603, second collecting box; 604, first collecting box; 605, connecting plate; 606, side plate; 607, bottom plate; 608, limit plate; 609, slide groove; 610, slide seat; 701, first groove; 702, air delivery chamber. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0019] Example 1 like Figures 1 to 4 As shown, an embodiment of the present invention provides a graphene-enhanced oilfield single-well produced water reinjection treatment device, comprising a treatment box 1, in which a first baffle 102 and a second baffle 103 are fixedly arranged at intervals. The first baffle 102 and the box wall of the treatment box 1 enclose a sedimentation chamber 101 for settling produced water. The first baffle 102, the second baffle 103 and the box wall of the treatment box 1 enclose a separation chamber 104 for oil-water separation. The second baffle 103 and the box wall of the treatment box 1 enclose a hydrophobic chamber 105 for drainage. Specifically, in this embodiment, the pretreated produced water is first input into the sedimentation chamber 101 through the oil-water inlet, and the solid impurity particles in the produced water are settled in the sedimentation chamber 101. After the sedimentation is completed, the produced water can be transported to the separation chamber 104 for oil-water separation. The separated water can be output from the hydrophobic chamber 105 and collected. It should be noted that the produced water of this embodiment needs to be pretreated before being input into the sedimentation chamber 101. The pretreatment can use a filter made of graphene material to perform preliminary physical filtration to remove large suspended particles and impurities. The super adsorption performance of graphene can effectively capture some small particles, but some small particles will still enter the sedimentation chamber 101. The small particles can be further settled and removed through the sedimentation chamber 101, effectively improving the solid particle removal rate.

[0020] See also Figure 4, four groups of rollers 502 are arranged in a rectangular array for rotation in the separation chamber 104, one group of rollers 502 is fixed to the output end of the servo motor 5 fixed on the outer wall of the processing box 1, and the four groups of rollers 502 are covered with a graphene film 501; specifically, in this embodiment, the graphene film 501 is covered on the rollers 502, and when the servo motor 5 drives one group of rollers 502 to rotate, it can synchronously drive the graphene film 501 to be transmitted on each roller 502.

[0021] As a further solution of this embodiment, the graphene film 501 encloses an upper mold 503, a lower mold 504 and two sets of side films 505, one set of side films 505 is slidably fitted with the first partition 102, and the other set of side films 505 is slidably fitted with the second partition 103, and the lower mold 504 and the bottom wall of the processing box 1 are enclosed to form an oil storage cavity 506, wherein the setting position of the upper mold 503 is higher than the second partition 103 and lower than the first partition 102; It can be explained that, in this embodiment, the pretreated produced water is first input into the sedimentation chamber 101. When the water level in the sedimentation chamber 101 is flush with the top of the first partition 102, as the produced water continues to be input, the water in the sedimentation chamber 101 will overflow the cavity and flow along the top of the first partition 102 to the upper mold 503 of the graphene membrane 501. In this embodiment, the servo motor 5 and the roller 502 drive the graphene membrane 501 to slowly transmit along the direction of the water flow. During the transmission process, the produced water can be driven to flow toward the hydrophobic chamber 105. During the flow process, the oil in the produced water will penetrate and pass through the upper mold 503 and fall onto the lower mold 504, until it passes through the lower mold 504 and falls into the oil storage chamber 506, and the separated water It cannot pass through the upper mold 503, and is transported to the hydrophobic cavity 105 under the transmission action of the upper mold 503; it should be noted that, in the process of oil-water separation, the servo motor 5 can drive the roller 502 to rotate in real time, and the upper mold 503 in the initial position will rotate to the lower mold 504. Since there is a certain height difference between the upper mold 503 and the lower mold 504, when the oil falls from the upper mold 503 to the lower mold 504, it will have a backwashing effect on the graphene membrane 501 at the position of the lower mold 504, and then the oil originally blocked at the entrance / interior of the nanochannel will be unblocked to avoid affecting its oil-water separation effect. This reciprocating process can ensure that the graphene membrane 501 is always in a high-efficiency oil-liquid separation state.

[0022] Example 2 Based on Example 1, please refer to Figures 1-4A first water inlet pipe 107 is provided on the outside of the sedimentation chamber 101, and a second water inlet pipe 108 connected to the first water inlet pipe 107 is provided on the inside. The second water inlet pipe 108 extends to the bottom of the sedimentation chamber 101. It can be explained that the produced water after pretreatment is first transported to the first water inlet pipe 107, and then transported to the bottom of the sedimentation chamber 101 through the second water inlet pipe 108. In this embodiment, the water is transported to the bottom of the sedimentation chamber 101 so that the solid particles in the produced water can be quickly deposited, thereby preventing impurities from entering the separation chamber 104 with the water flow.

[0023] In this embodiment, since the roller 502 is cylindrical, the contact surface between the graphene membrane 501 and the roller 502 is also arc-shaped. In order to ensure the sealing between the graphene membrane 501 and the first separator 102 and prevent the produced water from entering the gap formed by the arc-shaped graphene membrane 501 and the first separator 102, please refer to Figure 4-Figure 5 A first groove 701 is provided on the side of the first partition 102 that is close to the second partition 103, wherein two sets of rollers 502 are respectively rotated and arranged in the first groove 701, and the graphene membrane 501 slides and fits with the groove wall of the first groove 701; it can be explained that when the water in the sedimentation chamber 101 overflows and is discharged onto the upper mold of the graphene membrane 501, based on the sealing effect of the graphene membrane 501 and the first groove 701, the produced water will not flow back into the gap formed by the arc-shaped graphene membrane 501 and the first partition 102, and the sealing effect is better.

[0024] Accordingly, in order to ensure the sealing effect between the graphene film 501 and the side wall of the processing box 1, in this embodiment, please refer to Figure 5 and Figure 7 , the box walls of the processing box body 1 on both sides of the separation chamber 104 are respectively provided with second grooves 7, and each roller 502 extends into the second groove 7 and is rotatably connected to its groove wall, and the two side edges of the graphene membrane 501 synchronously extend into the second groove 7 and slide in contact with its groove wall; it can be explained that in this embodiment, the two side edges of the graphene membrane 501 are slidably fitted with the groove wall of the second groove 7 to ensure the sealing between the two side edges of the graphene membrane 501 and the box wall of the processing box body 1, thereby preventing the produced water from leaking from the gap between the two side edges of the graphene membrane 501 and the box wall of the processing box body 1.

[0025] See Figure 1-Figure 3 as well as Figure 7 In order to facilitate the collection of the oil in the oil storage chamber 506, in this embodiment, an oil storage tank 4 is further provided on the outside of the processing box body 1, and an oil drain pipe 406 is provided on one side of the oil storage chamber 506, and the oil drain pipe 406 extends into the oil storage tank 4; specifically, the oil falling into the oil storage chamber 506 can be discharged into the oil storage tank 4 through the oil drain pipe 406 under the action of gravity, so as to facilitate subsequent collection.

[0026] In this embodiment, an oil storage tank 401 is fixedly arranged on the outside of the processing box body 1. The oil storage tank 401 is connected to the oil pump 402 through an oil pipe 404. The other end of the oil pump 402 is connected to the oil extraction pipe 405, and the oil extraction pipe 405 extends into the oil storage tank 4. It can be explained that in this embodiment, the oil in the oil storage tank 4 can be extracted by the oil pump 402, and then input into the oil storage tank 401 through the oil pipe 404 to collect the oil.

[0027] In addition, an oil outlet pipe 403 is provided on the oil storage tank 401 of this embodiment, and a valve is provided on the oil outlet pipe 403. When the oil in the oil storage tank 401 needs to be discharged, the valve can be opened.

[0028] As a further solution of this embodiment, please refer to Figures 1-4 In order to discharge and collect the separated water through the hydrophobic cavity 105; a water storage tank 3 is also arranged on the outside of the processing box body 1, and the water storage tank 3 is connected to the hydrophobic cavity 105 through two sets of water pipes 106; specifically, the water entering the hydrophobic cavity 105 can be discharged to the water storage tank 3 through the water pipe 106 for collection, so as to facilitate subsequent treatment.

[0029] In this embodiment, an air pipe 301 is provided on one side of the water tank 3, and the air pipe 301 is connected to the ozone generator for inputting ozone into the water tank 3; it can be explained that after the separated water enters the water tank 3, the ozone generator inputs ozone into the water tank 3 through the air pipe 301, so as to disinfect the water in the water tank 3.

[0030] Also, see Figure 3-Figure 6 During the long-term use of the graphene membrane 501, some organic pollutants (such as grease or surfactants) may also affect the characteristics of the membrane. In order to restore the oil-water separation characteristics of the membrane, in this embodiment, the upper mold 503, the lower mold 504 and the two sets of side membranes 505 are enclosed in the separation chamber 104 to form an air delivery chamber 702, and the air pump 303 is fixedly arranged on the outside of the processing box 1. One side of the air pump 303 is connected to the air inlet pipe 302, and the other end of the air inlet pipe 302 is connected to the ozone generator. The other end of the air pump 303 is connected to the air delivery chamber 702 through the air port 2; it can be explained that during the oil-liquid separation process, the ozone generated by the ozone generator can be synchronously input into the air delivery chamber 702 through the air pump 303, and the pollutants attached to the graphene membrane 501 are further oxidized by the ozone to avoid affecting the characteristics of the membrane. At the same time, the ozone can also disinfect the separated oil. In addition, during the process of ozone being input into the gas delivery cavity 702, the concentration and time must be strictly controlled to avoid excessive oxidation that damages the graphene structure (recommended concentration: 10–50 ppm, time: 10–30 min).

[0031] Furthermore, after the produced water is input into the sedimentation chamber 101, in order to facilitate the collection and treatment of the settled solid impurities, please refer to Figure 1-Figure 3 as well as Figure 6-Figure 8 , through slots 6 are respectively provided on the box walls on both sides of the bottom of the sedimentation chamber 101, and a first collecting box 604 is slidably embedded in the through slots 6. The first collecting box 604 is fixedly connected to the second collecting box 603 arranged on the outside of the processing box body 1 through a connecting plate 605. The structural dimensions of the first collecting box 604 and the second collecting box 603 are the same, and baffles 601 are fixedly arranged on the box walls outside the through slots 6 on both sides. The lower surface of the baffle 601 slides in contact with the upper surface of the collecting box, and a driving mechanism 602 is also fixedly arranged on the outside of the processing box body 1. The driving mechanism 602 is used to drive the first collecting box 604 and the second collecting box 603 to slide in the through slots 6; it can be explained that in the initial state, the first collecting box 604 is in a state of being embedded in the sedimentation chamber 101. Since the two side walls of the first collecting box 604 are in a state of sealing the through slots 6, the produced water immersed in the sedimentation chamber 101 will not be discharged by the through slots 6 Leakage is prevented, and the sealing effect is ensured. At this time, the impurity particles in the produced water can be settled in the first collecting box 604. After collecting for a period of time, the present embodiment can drive the first collecting box 604 along the through slot 6 to the outside of the sedimentation chamber 101 through the driving mechanism 602. At this time, the second collecting box 603 can move along the through slot 6 to the sedimentation chamber 101. During the movement, based on the sealing effect of the baffle 601 on the first collecting box 604, the separated water will not leak. When the first collecting box 604 is completely pulled out, the second collecting box 603 just moves to the sedimentation chamber 101 to exchange the positions of the first collecting box 604 and the second collecting box 603, and clean the impurities collected in the first collecting box 604 for collection again. This is repeated, and the present embodiment can clean the settled impurity particles without stopping, thereby ensuring the normal operation of the equipment.

[0032] In addition, the driving mechanism 602 of this embodiment may adopt a screw-nut transmission mechanism or a synchronous belt transmission mechanism, which is not limited in this embodiment.

[0033] In this embodiment, the first collecting box 604 and the second collecting box 603 respectively include two sets of side plates 606, and the side plates 606 on both sides are symmetrically fixedly arranged on both sides of the connecting plate 605. The bottom of the side plates 606 on both sides is slidably embedded with a bottom plate 607, and a limiting plate 608 is fixedly arranged on the end of the bottom plate 607 away from the connecting plate 605, wherein a sliding groove 609 is provided on the end of the side plates 606 on both sides close to the limiting plate 608, and a sliding seat 610 slidably embedded in the sliding groove 609 is fixedly arranged on the limiting plate 608; it can be explained that when the collecting box is in the sedimentation chamber 101, the bottom plate 607 With the limiting plates 608 embedded in the side plates 606 on both sides, the bottom plate 607 can be supported by the bottom wall of the processing box body 1. When the collection box is pushed out, as the processing box body 1 no longer supports the bottom plate 607, the bottom plate 607 can automatically slide down to separate from the side plates 606 under the action of gravity, so as to facilitate the discharge of foreign particles in the collection box. Before the collection box is input into the sedimentation chamber 101 again, the bottom plate 607 and the limiting plates 608 can be manually embedded in the side plates 606 on both sides until the bottom wall of the processing box body 1 supports the bottom plate 607 again. The operation is very convenient and easy to clean.

[0034] A graphene-enhanced oilfield single-well produced water reinjection treatment method comprises the following steps: See also Figures 1-4 , S1, input the pretreated produced water into the sedimentation chamber 101; S2. When the water level in the sedimentation chamber 101 is flush with the top of the first baffle 102, as the produced water continues to be input, the water in the sedimentation chamber 101 will overflow the cavity and flow along the top of the first baffle 102 to the upper mold 503 of the graphene membrane 501; S3. The graphene membrane 501 is driven slowly along the direction of the water flow by the servo motor 5 and the roller 502. During the transmission process, the produced water is driven to flow toward the hydrophobic cavity 105. The oil in the produced water will penetrate and pass through the upper mold 503 and fall onto the lower mold 504, until it passes through the lower mold 504 and falls into the oil storage cavity 506. S4. The separated water cannot pass through the upper mold 503 and is transported to the hydrophobic cavity 105 under the transmission action of the upper mold 503, thereby achieving oil-water separation.

[0035] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A graphene-enhanced oilfield single-well produced water reinjection treatment equipment, comprising a treatment box (1), characterized in that: The treatment box (1) is provided with a first partition (102) and a second partition (103) arranged at intervals and fixedly arranged therein; the first partition (102) and the box wall of the treatment box (1) are enclosed to form a sedimentation chamber (101) for settling produced water; the first partition (102), the second partition (103) and the box wall of the treatment box (1) are enclosed to form a separation chamber (104) for oil-water separation; and the second partition (103) and the box wall of the treatment box (1) are enclosed to form a hydrophobic chamber (105) for drainage; Four groups of rollers (502) are arranged in a rectangular array in the separation chamber (104) for rotation, wherein one group of rollers (502) is fixed to the output end of a servo motor (5) fixed to the outer wall of the processing box (1), and the four groups of rollers (502) are covered with graphene membranes (501); The graphene film (501) is enclosed to form an upper mold (503), a lower mold (504) and two groups of side membranes (505), one group of side membranes (505) is slidably fitted with the first partition (102), and the other group of side membranes (505) is slidably fitted with the second partition (103), and the lower mold (504) is enclosed with the bottom wall of the processing box (1) to form an oil storage cavity (506), and the setting position of the upper mold (503) is higher than the second partition (103) and lower than the first partition (102).

2. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 1, characterized in that: A first groove (701) is provided on the side of the first partition (102) facing the second partition (103), wherein two groups of rollers (502) are respectively rotatably arranged in the first groove (701), and the graphene film (501) is slidably fitted with the groove wall of the first groove (701).

3. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 2, characterized in that: The walls of the processing box (1) on both sides of the separation chamber (104) are respectively provided with second grooves (7), and each roller (502) extends into the second groove (7) and is rotatably connected to the groove wall. The two side edges of the graphene film (501) simultaneously extend into the second groove (7) and are slidably fitted with the groove wall.

4. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 1, characterized in that: An oil storage tank (4) is further provided on the outside of the processing box body (1), and an oil drain pipe (406) is provided on one side of the oil storage cavity (506), and the oil drain pipe (406) extends into the oil storage tank (4).

5. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 4, characterized in that: An oil storage tank (401) is also fixedly arranged on the outside of the processing box (1). The oil storage tank (401) is connected to the oil pump (402) via an oil delivery pipe (404). The other end of the oil pump (402) is connected to an oil extraction pipe (405), and the oil extraction pipe (405) extends into the oil storage tank (4).

6. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 1, characterized in that: A water storage tank (3) is also arranged outside the treatment box (1), and the water storage tank (3) is connected to the hydrophobic cavity (105) through two groups of water pipes (106); Wherein, an air delivery pipe (301) is provided on one side of the water storage tank (3), and the air delivery pipe (301) is connected to the ozone generating device for inputting ozone into the water storage tank (3).

7. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 6, characterized in that: The upper mold (503), the lower mold (504) and the two sets of side membranes (505) are enclosed in the separation chamber (104) to form an air delivery chamber (702). An air pump (303) is fixedly arranged on the outside of the processing box (1). One side of the air pump (303) is connected to the air inlet pipe (302), and the other end of the air inlet pipe (302) is connected to the ozone generator. The other end of the air pump (303) is connected to the air delivery chamber (702) through the air port (2).

8. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 1, characterized in that: Through slots (6) are respectively provided on the box walls on both sides of the bottom of the sedimentation chamber (101), and a first collecting box (604) is slidably embedded in the through slots (6). The first collecting box (604) is fixedly connected to the second collecting box (603) arranged on the outside of the processing box body (1) through a connecting plate (605). The structural dimensions of the first collecting box (604) and the second collecting box (603) are the same. Baffles (601) are fixedly arranged on the box walls outside the through slots (6) on both sides, and the lower surface of the baffle (601) is slidably fitted with the upper surface of the collecting box. A driving mechanism (602) is also fixedly arranged on the outside of the processing box body (1), and the driving mechanism (602) is used to drive the first collecting box (604) and the second collecting box (603) to slide in the through slots (6).

9. The graphene-enhanced oilfield single-well produced water reinjection treatment equipment according to claim 8, characterized in that: The first collecting box (604) and the second collecting box (603) respectively include two sets of side panels (606), and the side panels (606) are symmetrically fixedly arranged on both sides of the connecting plate (605), and the bottom of the side panels (606) is slidably embedded with a bottom panel (607), and a limiting plate (608) is fixedly arranged on one end of the bottom panel (607) away from the connecting plate (605), wherein a sliding groove (609) is provided at one end of the side panels (606) facing the limiting plate (608), and a sliding seat (610) is fixedly arranged on the limiting plate (608) and is slidably embedded in the sliding groove (609).

10. A graphene-enhanced oilfield single-well produced water reinjection treatment method, characterized in that: A graphene-enhanced oilfield single-well produced water reinjection treatment device as described in any one of claims 1 to 9 comprises the following steps: The pretreated produced water is input into the sedimentation chamber (101); When the water level in the sedimentation chamber (101) is flush with the top of the first baffle (102), as the produced water continues to be input, the water in the sedimentation chamber (101) overflows the chamber and flows along the top of the first baffle (102) toward the upper mold (503) of the graphene membrane (501); The graphene membrane (501) is driven by the servo motor (5) and the roller (502) to slowly rotate along the direction of the water flow. During the rotation process, the produced water is driven to flow toward the hydrophobic cavity (105). The oil in the produced water will penetrate and pass through the upper mold (503) and fall onto the lower mold (504), until it passes through the lower mold (504) and falls into the oil storage cavity (506); The separated water cannot pass through the upper mold (503) and is transported to the hydrophobic cavity (105) under the transmission action of the upper mold (503), thereby achieving oil-water separation.

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