Oil field produced water treatment system

Abstract

The starting end of the oilfield produced water treatment system is connected to oilfield produced water, and the tail end of the oilfield produced water treatment system is connected to a water injection station; a settling device, a reaction device and a filtering device are arranged between the two layers; a sewage outlet and a crude oil outlet are formed in the outlet end of the settling device; the reaction device is a medicament treatment device; the medicament treatment device is connected with the sewage outlet; the filtering device is a secondary filtering device and comprises a primary quartz sand coarse filtering device and a secondary fiber ball fine filtering device which are connected in sequence; the first-stage quartz sand coarse filtering device is connected with an outlet of the medicament treatment device, and an outlet end of the second-stage fiber ball fine filtering device is connected to a water injection station; the device further comprises a nanometer material adding device. The first-stage quartz sand coarse filtering device and the second-stage fiber ball fine filtering device are both connected with the nano material adding device. The oil field produced water treatment device can quickly and efficiently treat oil field produced water in the oil field production process, and is simple, low in operation difficulty and suitable for popularization and application in oil fields.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum development, in particular to an oilfield produced water treatment system. Background Art

[0002] Oilfield produced water treatment is a crucial step in the oil extraction process. Produced water contains various impurities, crude oil, and dissolved gases, requiring effective treatment to meet environmental emission standards and water resource recycling requirements. Traditional oilfield produced water treatment devices have several drawbacks, such as low treatment efficiency, large footprint, and complex operation. Therefore, a novel, highly efficient oilfield produced water treatment device is necessary. The present invention proposes a wastewater purification device that combines chemicals with materials, featuring a simple structure and high efficiency, capable of rapidly treating oilfield wastewater.

[0003] Existing technology removes crude oil and other suspended matter from oily wastewater through purification equipment such as sedimentation and filtration. This process can be summarized as a three-stage process: natural oil removal + coagulation and oil removal + pressure filtration. This process primarily includes natural sedimentation tanks, coagulation and sedimentation tanks, buffer tanks, and pressure filtration tanks. After entering the wastewater, impurities are removed through natural sedimentation. Then, suspended matter is removed through coagulation and buffer tanks. Finally, the treated water is pressure filtered and transported to the nearest water injection station for reinjection.

[0004] The existing three-stage treatment process of "natural oil removal + coagulation oil removal + pressure filtration" operates independently, potentially resulting in low overall efficiency. In particular, the removal of fine particles and soluble oils may be limited. Furthermore, processes like pressure filtration consume significant energy, increasing operating costs. Pressure filtration, in particular, requires even greater energy to push water through the filter media, increasing the cost of electricity and mechanical equipment. The treated water can also contain various bacteria and fail to fully meet environmental discharge standards. Summary of the Invention

[0005] The utility model aims to solve the above problems and proposes an oilfield produced water treatment system.

[0006] The technical solution of the utility model is:

[0007] An oilfield produced water treatment system, wherein the starting end is connected to the oilfield produced water and the tail end is connected to the water injection station; a sedimentation device, a reaction device and a filtering device are provided between the starting end and the tail end;

[0008] The outlet end of the sedimentation device is provided with a sewage outlet and a crude oil outlet;

[0009] The reaction device is a pharmaceutical treatment device, and the pharmaceutical treatment device is connected to the sewage outlet;

[0010] The filtering device is a two-stage filtering device, comprising a primary quartz sand coarse filtering device and a secondary fiber ball fine filtering device connected in sequence; the primary quartz sand coarse filtering device is connected to the outlet of the pharmaceutical processing device, and the outlet end of the secondary fiber ball fine filtering device is connected to the water injection station;

[0011] It also includes a nano material adding device; the first-level quartz sand coarse filtering device and the second-level fiber ball fine filtering device are both connected to the nano material adding device.

[0012] It also includes an electric flocculation tank, through which the oilfield produced water is connected to the sedimentation device.

[0013] A sterilizing device is also provided between the outlet end of the secondary fiber ball fine filtering device and the water injection station.

[0014] It also includes a sewage treatment device, which is a sewage pool; the inlet end of the sewage pool is connected to the reaction device, and the outlet end of the sewage pool flows back to the inlet end of the electric flocculation tank.

[0015] A lifting device is further provided between the reaction device and the primary quartz sand coarse filtering device, and the lifting device is a lifting pump.

[0016] The pharmaceutical processing device is a pharmaceutical reaction tank, the top of which is connected to a dosing device; it also includes a stirring device, which includes a stirring rod and a motor connected to the stirring rod; one end of the stirring rod is located outside the dosing device, and the other end passes through the dosing device and extends into the pharmaceutical reaction tank.

[0017] The sedimentation device is a sedimentation and oil removal tank, the inlet end of the sedimentation and oil removal tank is connected to the outlet end of the electric flocculation tank, and the outlet end of the sedimentation and oil removal tank includes a sewage outlet end and a crude oil outlet end; the sewage outlet end is connected to the inlet end of the reagent reaction tank.

[0018] The utility model further comprises an oil storage tank, wherein the inlet end of the oil storage tank is connected to the crude oil outlet end through a waste oil discharge pipeline.

[0019] The inlet end of the electric flocculation tank is connected to the oilfield produced water through the produced water inlet pipeline; the outlet end of the sewage pool flows back to the produced water inlet pipeline and then enters the electric flocculation tank.

[0020] The sterilization device is connected to the water injection station through a drainage line.

[0021] The technical effects of the utility model are:

[0022] The utility model can realize fast and efficient treatment of oilfield produced water in the oilfield production process, has a simple device, and is easy to operate and operate, and is suitable for promotion and application in oilfields. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a flow chart of an oilfield produced water treatment system.

[0024] Figure numerals: 1. Electric flocculation tank; 2. Sedimentation and oil removal tank; 3. Chemical reaction tank; 4. Primary quartz sand coarse filtration device; 5. Secondary fiber ball fine filtration device; 6. Nanomaterial adding device; 7. Sewage tank; 8. Oil storage tank; 9. Produced water inlet pipeline; 10. Waste oil discharge pipeline; 11. Dosing device; 12. Motor; 13. Stirring rod; 14. Lifting pump; 15. Quartz sand; 16. Fiber ball; 17. Sterilization device; 18. Drainage pipeline. DETAILED DESCRIPTION

[0025] Example 1

[0026] An oilfield produced water treatment system, wherein the starting end is connected to the oilfield produced water and the tail end is connected to the water injection station; a sedimentation device, a reaction device and a filtering device are provided between the starting end and the tail end;

[0027] The outlet end of the sedimentation device is provided with a sewage outlet and a crude oil outlet;

[0028] The reaction device is a pharmaceutical treatment device, and the pharmaceutical treatment device is connected to the sewage outlet;

[0029] The filtering device is a two-stage filtering device, comprising a primary quartz sand coarse filtering device 4 and a secondary fiber ball fine filtering device 5 connected in sequence; the primary quartz sand coarse filtering device 4 is connected to the outlet of the pharmaceutical processing device, and the outlet end of the secondary fiber ball fine filtering device 5 is connected to the water injection station;

[0030] It also includes a nano material adding device 6; the first-level quartz sand coarse filtering device 4 and the second-level fiber ball fine filtering device 5 are both connected to the nano material adding device 6.

[0031] The specific implementation process of this embodiment is as follows:

[0032] The produced water from the oil field enters the sedimentation device, and after gravity sedimentation, the sewage enters the reaction device for treatment. The treated sewage first enters the first-level quartz sand coarse filtration device 4 for coarse filtration. The main component of the first-level quartz sand coarse filtration device 4 is quartz sand 15; then it continues to enter the second-level fiber ball fine filtration device 5 for fine filtration. The main component of the second-level fiber ball fine filtration device 5 is fiber balls 16. Nanomaterials are added to the first-level quartz sand coarse filtration device 4 and the second-level fiber ball fine filtration device 5 through the nanomaterial adding device 6 to improve the filtration effect. After secondary filtration, the sewage is transported to the water injection station.

[0033] Example 2

[0034] On the basis of Example 1, it further includes: an electric flocculation tank 1, the oilfield produced water is connected to the sedimentation device through the electric flocculation tank 1, and the sewage is pretreated by the electric flocculation tank 1.

[0035] Example 3

[0036] On the basis of Example 2, it further includes: a sterilization device 17 is provided between the outlet end of the secondary fiber ball fine filtration device 5 and the water injection station.

[0037] Example 4

[0038] On the basis of Example 3, a sewage treatment device is further included, which is a sewage pool 7; the inlet end of the sewage pool 7 is connected to the reaction device, and the outlet end of the sewage pool 7 flows back to the inlet end of the electric flocculation tank 1.

[0039] Example 5

[0040] On the basis of Example 4, the present invention further includes:

[0041] A lifting device is further provided between the reaction device and the primary quartz sand coarse filtering device 4 , and the lifting device is a lifting pump 14 .

[0042] Example 6

[0043] On the basis of Example 5, the present invention further includes:

[0044] The pharmaceutical processing device is a pharmaceutical reaction tank 3, the top of which is connected to a dosing device 11; it also includes a stirring device, which includes a stirring rod 13 and a motor 12 connected to the stirring rod 13; one end of the stirring rod 13 is located outside the dosing device 11, and the other end passes through the dosing device 11 and extends into the pharmaceutical reaction tank 3;

[0045] The sedimentation device is a sedimentation and oil removal tank 2, the inlet end of the sedimentation and oil removal tank 2 is connected to the outlet end of the electric flocculation tank 1, and the outlet end of the sedimentation and oil removal tank 2 includes a sewage outlet end and a crude oil outlet end; the sewage outlet end is connected to the inlet end of the reagent reaction tank 3;

[0046] The system further comprises an oil storage tank 8 , the inlet end of the oil storage tank 8 being connected to the crude oil outlet end via a waste oil discharge pipeline 10 .

[0047] Example 7

[0048] On the basis of Example 6, the present invention further includes:

[0049] The inlet of the electrocoagulation tank 1 is connected to the oilfield produced water through the produced water inlet pipeline 9; the outlet of the sewage pool 7 flows back to the produced water inlet pipeline 9 and then enters the electrocoagulation tank 1. The sterilization device 17 is connected to the water injection station through the drainage pipeline 18.

[0050] The specific implementation process of this embodiment is as follows:

[0051] Produced water from the oilfield enters the electrocoagulation tank 1 and the sedimentation and oil removal tank 2 sequentially through the produced water inlet pipeline 9. After pretreatment and gravity sedimentation, the crude oil enters the oil storage tank 8, while the wastewater enters the chemical reaction tank 3 to react with the chemical. The chemical reaction tank 3 agitates the wastewater and adds chemicals for purification. The treated wastewater then flows through the lift pump 14 into the primary quartz sand coarse filter 4 for coarse filtration. It then continues to the secondary fiber ball fine filter 5 for fine filtration, and finally enters the sterilization device 17 for further purification. Finally, it is transported to the water injection station via the drainage pipeline 18. Untreated wastewater in the chemical reaction tank 3 is stored in the sewage tank 7 and then circulated into the electrocoagulation tank 1 for further treatment.

Claims

1. An oilfield produced water treatment system, the starting end of which is connected to the oilfield produced water and the tail end of which is connected to the water injection station; characterized in that: Between the starting end and the tail end, there are provided a sedimentation device, a reaction device and a filtering device connected in sequence; The outlet end of the sedimentation device is provided with a sewage outlet and a crude oil outlet; The reaction device is a pharmaceutical treatment device, and the pharmaceutical treatment device is connected to the sewage outlet; The filtering device is a two-stage filtering device, comprising a first-stage quartz sand coarse filtering device (4) and a second-stage fiber ball fine filtering device (5) connected in sequence; the first-stage quartz sand coarse filtering device (4) is connected to the outlet of the pharmaceutical processing device, and the outlet end of the second-stage fiber ball fine filtering device (5) is connected to the water injection station; It also includes a nano material adding device (6); the first-level quartz sand coarse filtering device (4) and the second-level fiber ball fine filtering device (5) are both connected to the nano material adding device (6).

2. The oilfield produced water treatment system according to claim 1, characterized in that: It also includes an electric flocculation tank (1), and the oilfield produced water is connected to the sedimentation device through the electric flocculation tank (1).

3. The oilfield produced water treatment system according to claim 2, characterized in that: A sterilizing device (17) is also provided between the outlet end of the secondary fiber ball fine filtering device (5) and the water injection station.

4. The oilfield produced water treatment system according to claim 3, characterized in that: It also includes a sewage treatment device, which is a sewage pool (7); the inlet end of the sewage pool (7) is connected to the reaction device, and the outlet end of the sewage pool (7) flows back to the inlet end of the electric flocculation tank (1).

5. The oilfield produced water treatment system according to claim 4, characterized in that: A lifting device is further provided between the reaction device and the primary quartz sand coarse filtering device (4), and the lifting device is a lifting pump (14).

6. The oilfield produced water treatment system according to claim 5, characterized in that: The pharmaceutical processing device is a pharmaceutical reaction tank (3), the top of which is connected to a dosing device (11); and further comprises a stirring device, which comprises a stirring rod (13) and a motor (12) connected to the stirring rod (13); one end of the stirring rod (13) is located outside the dosing device (11), and the other end passes through the dosing device (11) and extends into the pharmaceutical reaction tank (3).

7. The oilfield produced water treatment system according to claim 6, characterized in that: The sedimentation device is a sedimentation and oil removal tank (2), the inlet end of the sedimentation and oil removal tank (2) is connected to the outlet end of the electric flocculation tank (1), and the outlet end of the sedimentation and oil removal tank (2) includes a sewage outlet end and a crude oil outlet end; the sewage outlet end is connected to the inlet end of the reagent reaction tank (3).

8. The oilfield produced water treatment system according to claim 6, characterized in that: It also includes an oil storage tank (8), the inlet end of the oil storage tank (8) is connected to the crude oil outlet end through a waste oil discharge pipeline (10).

9. The oilfield produced water treatment system according to claim 7, characterized in that: The inlet end of the electric flocculation tank (1) is connected to the oilfield produced water through the produced water inlet pipeline (9); the outlet end of the sewage pool (7) flows back to the produced water inlet pipeline (9) and then enters the electric flocculation tank (1).

10. The oilfield produced water treatment system according to claim 3, characterized in that: The sterilization device (17) is connected to the water injection station via a drainage line (18).

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