Rapid separation treatment device for oilfield produced liquid

Abstract

The utility model discloses a rapid separation treatment device for oilfield produced liquid, which is characterized in that a produced liquid buffer tank is connected with a produced liquid rapid separation device, the produced liquid rapid separation device is respectively connected with a crude oil rapid deep separation device and a water discharge tank, and the produced liquid rapid separation device is also connected with an on-site natural gas purification system; the crude oil rapid deep separation device is connected with a purification oil tank, the water discharging pool is connected with the efficient oil removal rapid separation device, and the efficient oil removal rapid separation device is connected with the interface coalescence fine purification H-shaped device and the interface coalescence fine purification S-shaped device. The interface coalescence fine purification H-shaped device and the interface coalescence fine purification S-shaped device are both connected with the interface coalescence fine purification C-shaped device, and the interface coalescence fine purification C-shaped device is connected with the purification water tank; the device disclosed by the utility model can be used for separating, coalescing, demulsifying and dehydrating the oil field produced liquid, so that the high-efficiency refined pure physical purification treatment of the oil field produced liquid is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield produced liquid separation, in particular to an oilfield produced liquid rapid separation and processing device. Background Art

[0002] With the change of oilfield exploitation methods, the water content and properties of oilfield produced fluids are also changing. The water content gradually increases from the initial low water content of 30% to about 90%. The strength, viscosity, thickness, etc. of the oil-water interface film are also increasing, the stability is increasing, and the difficulty of processing is increasing. There are many criticisms in the production process of oil fields in different regions of China, which has led to serious restrictions on the crude oil development process.

[0003] For oil field exploitation in some parts of China, there are the following core issues:

[0004] (1) Oilfield produced fluid dehydration problem:

[0005] ① In domestic oilfield exploitation areas, the degree of dispersion of oil well produced fluid in each production well block is serious, the process chain of the production area is complicated and cumbersome, the distance between each production well block is far, and repeated tank emptying and sedimentation are required during the production process; ② The produced fluid from each single well in the well site is transported to the nearest oil production station by tank truck, and is heated, dosing and demulsification, sedimentation and tank emptying, measured and metered, and then shipped to the joint centralized processing station by tank truck for further heating, dosing and dehydration sedimentation treatment, and finally handed over to the gathering station for unified collection and delivery to the downstream refining company. The process chain is long and the production and operation cost is high; ③ Oilfield enterprises have been troubled by the existence of the above problems for a long time. In order to rectify and reform the current production process status, the policy of "digital construction of pipeline transportation in the western oil region" has been determined. In response to the implementation of this policy, the demand for corresponding equipment is very urgent.

[0006] (2) Oilfield produced water purification issues:

[0007] ① Due to the insufficient safety distance of the oil well site and the failure to meet the site construction requirements, most sites cannot meet the implementation conditions of the produced water treatment project, and the excess produced water volume of the produced fluid cannot be treated and reinjected; ② There are many types of oil field production layers, and the layer systems are not uniform. The produced water in most blocks adopts a mixed layer treatment method, which causes scaling and corrosion of ground equipment and pipelines, substandard water quality, poor compatibility and incompatibility of mixed layer water. Some oil wells use a single set of water injection facilities for multiple development layers, resulting in inconsistent water injection layers and great difficulty in reinjection of produced water; ③ The oil field production well site is mixed and transported, but a set of process flow is used for dehydration, resulting in the produced water becoming mixed layer water from the source, and it is impossible to implement stratified treatment and stratified reinjection; ④ The water purification agents added in the produced water treatment process, such as flocculants and coagulants, are large in dosage, the agent consumption cost is high, the hazardous waste oil sludge content generated in the treatment process is high, and the oil sludge cannot be treated in time, resulting in unqualified injection water quality and low water treatment volume. Utility Model Content

[0008] The utility model aims to provide a device for quickly separating and processing oilfield produced fluid, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above purpose, the utility model provides the following solutions:

[0010] An oilfield produced liquid rapid separation and processing device, comprising a produced liquid buffer tank, an oil-gas-water mixed transmission pump, a produced liquid rapid separation device, a crude oil rapid deep separation device, a water unloading tank, an oil purification tank, a water inlet lift pump, a high-efficiency oil removal rapid separation device, an interface coalescence fine purification H-type device, an interface coalescence fine purification S-type device, an interface coalescence fine purification C-type device and a purified water tank;

[0011] The produced liquid buffer tank is connected to the input end of the oil-gas-water mixed flow pump, and the output end of the oil-gas-water mixed flow pump is connected to the produced liquid rapid separation device, and the produced liquid rapid separation device is respectively connected to the crude oil rapid deep separation device and the water unloading tank, and the produced liquid rapid separation device is also connected to the on-site natural gas purification system, the crude oil rapid deep separation device is connected to the purified oil tank, the water unloading tank is connected to the input end of the water intake lift pump, and the output end of the water intake lift pump is connected to the high-efficiency oil removal rapid separation device, and the high-efficiency oil removal rapid separation device is respectively connected to the interface coalescence fine purification H-type device and the interface coalescence fine purification S-type device, the interface coalescence fine purification H-type device and the interface coalescence fine purification S-type device are both connected to the interface coalescence fine purification C-type device, and the interface coalescence fine purification C-type device is connected to the purified water tank.

[0012] Furthermore, the produced liquid buffer tank is provided with a feed inlet pipe fitting, a discharge outlet pipe fitting, an exhaust port I pipe fitting and a sewage outlet I pipe fitting.

[0013] Furthermore, the produced liquid rapid separation device comprises a tank body II, the tank body II is provided with a produced liquid inlet pipe fitting, and the tank body II is provided with a buffer baffle, a metal mesh filler, a dehydration element II-I and a dehydration element II-II in sequence;

[0014] The position of the produced liquid inlet pipe piece corresponds to that of the buffer baffle;

[0015] An oil-water interface flow stabilizer is arranged inside the tank body II, an oil-water interface level meter is installed on the tank body II through an oil-water interface level meter interface pipe fitting, a water outlet pipe fitting is installed on the tank body II, a vortex preventer is installed on the water outlet pipe fitting, and a crude oil gathering bag and an oil discharge pipe fitting are installed on the top of the tank body II.

[0016] Furthermore, the crude oil rapid deep separation device comprises a tank body III, the tank body III is provided with a low-water crude oil inlet pipe fitting, and the tank body III is sequentially provided with an oil inlet distributor, a dehydration element III-I, an oil collecting tank and a dehydration element III-II;

[0017] The low-water crude oil inlet pipe is connected to the oil inlet distributor, the oil inlet distributor is connected to the dehydration element III-I, the dehydration element III-I is connected to the oil collecting tank, and the oil collecting tank is connected to the dehydration element III-II;

[0018] The top end of the dehydration element III-II is connected to an oil collection pipe, and the bottom end is connected to a water collection pipe;

[0019] The tank body III is also provided with an oil outlet pipe fitting and a water outlet III-II pipe fitting, and the oil collecting pipe and the water collecting pipe are respectively connected to the oil outlet pipe fitting and the water outlet III-II pipe fitting;

[0020] The tank body III is externally connected to an electric heating device through an electric heater interface pipe.

[0021] Furthermore, the high-efficiency oil removal and rapid separation device comprises a tank body IV, the tank body IV is provided with a water inlet IV pipe fitting, a water inlet distribution pipe is provided inside the tank body IV, and the water inlet IV pipe fitting is connected to the water inlet distribution pipe;

[0022] The interior of the tank IV is divided into a first compartment, a second compartment and a third compartment in sequence;

[0023] The water inlet distribution pipe is located in the first bin;

[0024] The first bin is also provided with an oil removal element IV-I, and the water inlet distribution pipe is connected to the oil removal element IV-I;

[0025] The second chamber is provided with an oil removal element IV-II and connected to the oil removal element IV-I, and the top of the oil removal element IV-II is connected to a water collecting pipe;

[0026] The third bin is provided with an oil removal element IV-III, and the bottom end of the oil removal element IV-III is connected to the third bin water distribution pipe;

[0027] The third bin water distribution pipe is connected to the water collection pipe through a bin connecting pipe.

[0028] Furthermore, the interface coalescence fine purification H-type device comprises a tank body V, a sewage branch pipe is arranged on the left side of the tank body V and is connected to the sewage main pipeline on site, an air wash air inlet pipe is arranged on the right side, a water outlet V pipe is arranged at the lower end and a water wash water inlet pipe is arranged on the water outlet V pipe, a water inlet V pipe and an air wash exhaust pipe are arranged at the top, and a backwash water outlet pipe is arranged on the water inlet V pipe;

[0029] The structure and connection relationship of the interface coalescence fine purification S-type device and the interface coalescence fine purification H-type device are consistent.

[0030] Furthermore, the interface coalescence fine purification type C device comprises a tank body VII, the interior of the tank body VII is divided into three parts: chamber VII-I, chamber VII-II and chamber VII-III, and the tops of the chambers VII-I and VII-II are respectively provided with a water inlet distribution pipe fitting for chamber VII-I and a water inlet distribution pipe fitting for chamber VII-II;

[0031] The chamber VII-I is provided with a purification element VII, the water inlet and water distribution pipe of the chamber VII-I is connected to the purification element VII in the chamber VII-I, and the purification element VII in the chamber VII-I is connected to the water inlet and water distribution pipe of the chamber VII-I;

[0032] The purification element VII is also provided in the chamber VII-II, the water inlet and water distribution pipe of the chamber VII-II is connected to the purification element VII in the chamber VII-II, and the purification element VII in the chamber VII-II is connected to the water outlet pipe of the chamber VII-II;

[0033] An oil removal element VII is arranged in the chamber VII-III, and the oil removal element VII is connected to an oil removal cloth water pipe, and the oil removal cloth water pipe is connected to the water inlet and water distribution pipe fitting of the chamber VII-III.

[0034] It can be seen from the above technical solution that, compared with the prior art, the beneficial effects of the utility model are:

[0035] The utility model realizes separation, agglomeration, demulsification and dehydration of produced fluid through compact short-process technology, and the synergistic effect between various dehydration elements, oil removal elements and purification elements; realizes efficient and refined pure physical purification treatment of oil field produced water and stable compliance with standards; ensures that the dehydrated crude oil reaches the purified oil index and is directly transported out, the purified oil field produced water reaches the reinjection water index and is directly reinjected on site, and the oil field produced water is treated in a stratified system and reinjected in a stratified system.

[0036] It responds to the oilfield enterprises' policy guideline of "digital construction of pipeline transportation in western oil regions", meets the equipment needs in the process of policy implementation, greatly simplifies and shortens the current produced fluid dehydration and produced water purification processes, and reduces the operating costs in the production process; it solves the current situation of mixed production, mixed transportation and mixed injection of different layers in oilfield exploitation, realizes stratified treatment in different areas and 100% reinjection of the same layer in each layer, and solves the problems of difficulty in establishing produced water treatment stations and the whereabouts of excess water. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 This is the overall process layout diagram of the oilfield produced fluid rapid separation and processing device in the embodiment of the utility model;

[0039] Figure 2 This is a schematic diagram of the structure of the produced liquid buffer tank in the embodiment of the utility model;

[0040] Figure 3 This is a schematic diagram of the structure of the produced liquid rapid separation device in the embodiment of the utility model;

[0041] Figure 4 This is a schematic diagram of the structure of a crude oil rapid deep separation device in an embodiment of the utility model;

[0042] Figure 5 This is a schematic diagram of the structure of a high-efficiency oil removal and rapid separation device in an embodiment of the utility model;

[0043] Figure 6 This is a schematic diagram of the structure of an H-type device for interface coalescence fine purification in an embodiment of the utility model;

[0044] Figure 7 It is a schematic structural diagram of the interface coalescence fine purification C-type device in the embodiment of the utility model.

[0045] Description of reference numerals:

[0046] 1. Produced liquid buffer tank; 1-1. Sewage outlet I pipe fittings; 1-2. Exhaust outlet I pipe fittings; 1-3. Feed inlet pipe fittings; 1-4. Discharge outlet pipe fittings;

[0047] 2. Rapid separation device for produced liquid; 2-1. Tank II; 2-2. Inspection manhole; 2-3. Metal mesh filler; 2-4. Exhaust port II pipe fittings; 2-5. Backwash water inlet II-I pipe fittings; 2-6. Backwash water inlet II-II pipe fittings; 2-7. Oil-water level gauge interface pipe fittings; 2-8. Crude oil collection bag; 2-9. Oil outlet pipe fittings; 2-10. Oil-water interface flow stabilizer; 2-11. Produced liquid inlet pipe fittings; 2-12. Buffer baffle; 2-13, sand flushing port II-I pipe fittings; 2-14, sewage outlet II-I pipe fittings; 2-15, sewage outlet II-II pipe fittings; 2-16, sewage outlet II-III pipe fittings; 2-17, dehydration element II-I; 2-18, dehydration element II-II; 2-19, sand flushing port II-II pipe fittings; 2-20, sewage outlet II-IV pipe fittings; 2-21, water outlet pipe fittings; 2-22, vortex preventer;

[0048] 3. Crude oil rapid deep separation device; 3-1. Tank III; 3-2. Flushing port III pipe fittings; 3-3. Ventilation port pipe fittings; 3-4. Low water crude oil inlet pipe fittings; 3-5. Manhole; 3-6. Backwashing inlet pipe fittings; 3-7. Pressure gauge interface pipe fittings; 3-8. Pressure transmitter interface pipe fittings; 3-9. Oil outlet pipe fittings; 3-10. Flushing port pipe fittings; 3-11. Oil collection pipe; 3-12. Dehydration element III-I; 3-13. Electric heating 3-14, oil inlet distributor; 3-15, backwash pipe; 3-16, sewage outlet III-I pipe; 3-17, water outlet III-I pipe; 3-18, sewage outlet III-II pipe; 3-19, water outlet III-II pipe; 3-20, sewage outlet III-III pipe; 3-21, saddle III; 3-22, oil collecting tank; 3-23, water collecting pipe; 3-24, dehydration element III-II;

[0049] 4. High-efficiency oil removal and rapid separation device; 4-1. Tank IV; 4-2. Water inlet IV pipe fittings; 4-3. Backwash water inlet IV-I pipe fittings; 4-4. Water inlet distribution pipe; 4-5. Crude oil collection bag IV-I interface pipe fittings; 4-6. Backwash water inlet IV-II pipe fittings; 4-7. Bin connecting pipe; 4-8. Oil removal element IV-II; 4-9. Backwash water inlet IV-III pipe fittings; 4-10. Crude oil collection bag IV-II interface pipe fittings; 4-11. Oil removal element IV-I; 4-12. Water outlet IV pipe fittings; 4-13. Oil removal element IV-III; 4-14. Sewage outlet IV-I pipe fittings; 4-15. Saddle IV; 4-16. Sewage outlet IV-II pipe fittings; 4-17. Sewage outlet IV-III pipe fittings;

[0050] 5. Interface coalescence fine purification H-type device; 5-1. Air washing exhaust outlet pipe fittings; 5-2. Water inlet water distribution outlet V pipe fittings; 5-3. Water inlet V pipe fittings; 5-4. Backwash outlet pipe fittings; 5-5. Air washing air inlet pipe fittings; 5-6. Interface coalescence filler; 5-7. Support layer; 5-8. Support plate; 5-9. Water outlet V pipe fittings; 5-10. Water washing water inlet pipe fittings;

[0051] 6. Interface coalescence fine purification S-type device;

[0052] 7. Interface coalescence fine purification type C device; 7-1. Tank body VII; 7-2. Chamber VII-I water inlet and water distribution pipe fittings; 7-3. Chamber VII-I backwash water inlet pipe fittings; 7-4. Purification element VII; 7-5. Chamber VII-I water outlet pipe fittings; 7-6. Chamber VII-II water outlet pipe fittings; 7-7. Chamber VII-II backwash water inlet pipe fittings; 7-8. Chamber VII-II water inlet and water distribution pipe fittings; 7-9. Chamber VII-III water inlet Water distribution pipe fittings; 7-10, crude oil collection bag VII interface pipe fittings; 7-11, chamber VII-III backwash water inlet pipe fittings; 7-12, oil removal element VII; 7-13, oil removal water distribution pipe; 7-14, water outlet VII pipe fittings; 7-15, steam intake pipe; 7-16, chamber VII-I sewage outlet pipe fittings; 7-17, chamber VII-II sewage outlet pipe fittings; 7-18, saddle VII; 7-19, chamber VII-III sewage outlet pipe fittings;

[0053] 8. Purified oil tank; 9. Unloading pool; 10. Purified water tank. DETAILED DESCRIPTION

[0054] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0055] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0059] See also Figure 1 As shown, the present embodiment provides an oilfield produced liquid rapid separation and processing device, comprising a produced liquid buffer tank 1, an oil-gas-water mixed transmission pump, a produced liquid rapid separation device 2, a crude oil rapid deep separation device 3, a water unloading tank 9, a purified oil tank 8, a water inlet lift pump, a high-efficiency oil removal rapid separation device 4, an interface coalescence fine purification H-type device 5, an interface coalescence fine purification S-type device 6, an interface coalescence fine purification C-type device 7 and a purified water tank 10;

[0060] The produced liquid buffer tank 1 is connected to the input end of the oil-gas-water mixed flow pump, the output end of the oil-gas-water mixed flow pump is connected to the produced liquid rapid separation device 2, the produced liquid rapid separation device 2 is respectively connected to the crude oil rapid deep separation device 3 and the water unloading tank 9, the produced liquid rapid separation device 2 is also connected to the on-site natural gas purification system, the crude oil rapid deep separation device 3 is connected to the purified oil tank 8, the water unloading tank 9 is connected to the input end of the water inlet lift pump, the output end of the water inlet lift pump is connected to the high-efficiency oil removal rapid separation device 4, the high-efficiency oil removal rapid separation device 4 is respectively connected to the interface coalescence fine purification H-type device 5 and the interface coalescence fine purification S-type device 6, the interface coalescence fine purification H-type device 5 and the interface coalescence fine purification S-type device 6 are both connected to the interface coalescence fine purification C-type device 7, and the interface coalescence fine purification C-type device 7 is connected to the purified water tank 10.

[0061] It should be noted that the produced liquid buffer tank is of a closed type, and the interface coalescence fine purification type C device can be vertical or horizontal.

[0062] Specifically, under the same formation system, the produced fluids of oil wells in each production block are collected at the main agency (with a comprehensive water content of 50%-90%), and heated to 20-30°C by a heat exchanger to meet the requirement that the produced fluid can flow in the pipeline. Then the produced fluid enters the produced fluid buffer tank 1. The produced fluid in the produced fluid buffer tank 1 is first transported to the produced fluid rapid separation device 2 by an oil-gas-water mixed transmission pump. The produced fluid rapid separation device 2 performs rapid and rough separation on the mixed fluid to separate free water. The produced fluid rapid separation device 2 separates crude oil with a water content of about 5%, and separates oily wastewater with an oil content of about 100 mg / L and a suspended matter content of about 200 mg / L. The low-water crude oil separated by the produced fluid rapid separation device 2 enters the crude oil rapid deep separation device 3 for further deep dehydration treatment. The low-water crude oil is heated to 30-40°C by an external electric heating device. The water content of low-water crude oil is reduced to below 0.5%, and enters the purified oil tank 8 or is transported to the downstream refinery. The oily wastewater is separated with an oil content of about 100 mg / L and a suspended solid content of about 200 mg / L. The separated oily and water-containing associated gas enters the natural gas purification system after being collected with the produced water separated by the produced liquid rapid separation device 2. The produced water stored in the unloading tank 9 is pumped into the high-efficiency oil removal rapid separation device 4 through the water inlet lift pump. The oil content in the separated water is as low as about 50 mg / L, and then the effluent continues to enter the interface coalescence fine purification H-type device 5 or the interface coalescence fine purification S-type device 6 for deep purification, and is finally further refined by the interface coalescence fine purification C-type device 7. The treated water enters the purified water tank 10 or is directly reinjected on site (ss<10 mg / L, oil<8 mg / L, d 0.5 <3 μm).

[0063] It should be noted that if Figure 2The produced liquid buffer tank 1 is provided with a feed inlet pipe fitting 1-3, a discharge outlet pipe fitting 1-4, an exhaust outlet I pipe fitting 1-2 and a sewage outlet I pipe fitting 1-1.

[0064] It should be noted that if Figure 3 The produced liquid rapid separation device 2 comprises a tank body II2-1, on which a produced liquid inlet pipe fitting 2-11 is arranged, and inside of the tank body II2-1 are sequentially arranged a buffer baffle 2-12, a metal mesh filler 2-3, a dehydration element II-I2-17 and a dehydration element II-II2-18;

[0065] The positions of the produced liquid inlet pipe 2-11 and the buffer baffle 2-12 correspond;

[0066] An oil-water interface flow stabilizer is provided inside the tank body II2-1, an oil-water interface level meter is installed on the tank body II2-1 through the oil-water interface level meter interface pipe fitting 2-7, a water outlet pipe fitting 2-21 is installed on the tank body II2-1, a vortex preventer 2-22 is installed on the water outlet pipe fitting 2-21, and a crude oil gathering bag 2-8 and an oil discharge pipe fitting 2-9 are installed on the top of the tank body II2-1.

[0067] Specifically, if Figure 3 The interior of the tank II2-1 is divided into multiple chambers. After the produced fluid passes through the dehydration element II-II, the oil and water will be separated and stored in the last chamber in a clear stratified state.

[0068] It should be noted that if Figure 3 The tank body II2-1 is also provided with an inspection manhole 2-2, an exhaust port II pipe fitting 2-4, a backwash water inlet II-I pipe fitting 2-5, a backwash water inlet II-II pipe fitting 2-6, an oil-water interface flow stabilizer 2-10, a sand flushing port II-I pipe fitting 2-13, a sewage outlet II-I pipe fitting 2-14, a sewage outlet II-II pipe fitting 2-15, a sewage outlet II-III pipe fitting 2-16, a sand flushing port II-II pipe fitting 2-19, and a sewage outlet II-IV pipe fitting 2-20.

[0069] It should be noted that, see Figure 4 As shown, the crude oil rapid deep separation device 3 includes a tank body III3-1, on which a low-water crude oil inlet pipe fitting 3-4 is disposed, and inside the tank body III3-1, an oil inlet distributor 3-14, a dehydration element III-I3-12, an oil collecting tank 3-22 and a dehydration element III-II3-24 are sequentially disposed;

[0070] The low-water crude oil inlet pipe fitting 3-4 is connected to the oil inlet distributor 3-14, the oil inlet distributor 3-14 is connected to the dehydration element III-I3-12, the dehydration element III-I3-12 is connected to the oil collecting tank 3-22, and the oil collecting tank 3-22 is connected to the dehydration element III-II3-24;

[0071] The top end of the dehydration element III-II3-24 is connected to the oil collection pipe 3-11, and the bottom end is connected to the water collection pipe 3-23;

[0072] The tank III3-1 is also provided with an oil outlet pipe fitting 3-9 and a water outlet III-II pipe fitting 3-19, and the oil collecting pipe 3-11 and the water collecting pipe 3-23 are connected to the oil outlet pipe fitting 3-9 and the water outlet III-II pipe fitting 3-19 respectively;

[0073] The tank body III3-1 is externally connected to an electric heating device through an electric heater interface pipe 3-13.

[0074] It should be noted that if Figure 4 The tank body III3-1 is also provided with a flushing port III pipe fitting 3-2, a vent pipe fitting 3-3, a manhole 3-5, a backwashing inlet pipe fitting 3-6, a pressure gauge interface pipe fitting 3-7, a pressure transmitter interface pipe fitting 3-8, a flushing port pipe fitting 3-10, a backwashing pipeline 3-15, a sewage outlet III-I pipe fitting 3-16, a water outlet III-I pipe fitting 3-17, a sewage outlet III-II pipe fitting 3-18, a sewage outlet III-III pipe fitting 3-20, and a saddle III3-21.

[0075] It should be noted that, see Figure 5 As shown, the efficient oil removal and rapid separation device 4 includes a tank body IV4-1, the tank body IV4-1 is provided with a water inlet IV pipe fitting 4-2, a water inlet distribution pipe 4-4 is arranged inside the tank body IV4-1, and the water inlet IV pipe fitting 4-2 is connected to the water inlet distribution pipe 4-4;

[0076] The interior of tank IV4-1 is divided into the first compartment, the second compartment and the third compartment in sequence;

[0077] The water inlet distribution pipe 4-4 is located in the first bin;

[0078] An oil removal element IV-I4-11 is also provided in the first bin, and the water inlet distribution pipe 4-4 is connected to the oil removal element IV-I4-11;

[0079] The second bin is provided with an oil removal element IV-II4-8 and connected to the oil removal element IV-I4-11, and the top of the oil removal element IV-II4-8 is connected to a water collecting pipe;

[0080] The third bin is provided with an oil removal element IV-III4-13, and the bottom end of the oil removal element IV-III4-13 is connected to the third bin water distribution pipe;

[0081] The third bin water distribution pipe is connected to the water collection pipe through the bin connecting pipe 4-7.

[0082] It should be noted that if Figure 5 The tank body IV4-1 is also provided with a backwash water inlet IV-I pipe fitting 4-3, a crude oil collection bag IV-I interface pipe fitting 4-5, a backwash water inlet IV-II pipe fitting 4-6, a backwash water inlet IV-III pipe fitting 4-9, a crude oil collection bag IV-II interface pipe fitting 4-10, a water outlet IV pipe fitting 4-12, a sewage outlet IV-I pipe fitting 4-14, a saddle IV4-15, a sewage outlet IV-II pipe fitting 4-16, and a sewage outlet IV-III pipe fitting 4-17.

[0083] It should be noted that, see Figure 6 As shown, the interface coalescence fine purification H-type device 5 includes a tank body V, a sewage branch pipe is arranged on the left side of the tank body V and is connected to the sewage main pipeline on site, an air washing air inlet pipe 5-5 is arranged on the right side, a water outlet V pipe 5-9 is arranged at the lower end, and a water washing water inlet pipe 5-10 is arranged on the water outlet V pipe 5-9, a water inlet V pipe 5-3 and an air washing exhaust pipe 5-1 are arranged at the top, and a backwash water outlet pipe 5-4 is arranged on the water inlet V pipe 5-3;

[0084] The structure and connection relationship of the interface coalescence fine purification S-type device 6 and the interface coalescence fine purification H-type device 5 are consistent.

[0085] It should be noted that if Figure 6 The tank body V is also provided with a water inlet distribution port V pipe fitting 5-2, an interface coalescing filler 5-6, a supporting layer 5-7, and a supporting plate 5-8.

[0086] It is necessary to say that see Figure 7 As shown, the interface coalescence fine purification type C device 7 includes a tank body VII7-1, the interior of the tank body VII7-1 is divided into three parts: chamber VII-I, chamber VII-II and chamber VII-III, and the tops of chamber VII-I and chamber VII-II are respectively provided with a chamber VII-I water inlet distribution pipe fitting 7-2 and a chamber VII-II water inlet distribution pipe fitting 7-8;

[0087] A purification element VII7-4 is provided in chamber VII-I7-1, the water inlet and water distribution pipe fitting 7-2 of chamber VII-I is connected to the purification element VII7-4 in chamber VII-I7-1, and the purification element VII7-4 in chamber VII-I7-1 is connected to the water inlet and water distribution pipe fitting 7-2 of chamber VII-I;

[0088] A purification element VII is also provided in chamber VII-II, a water inlet distribution pipe fitting 7-8 of chamber VII-II is connected to the purification element VII in chamber VII-II, and the purification element VII in chamber VII-II is connected to a water outlet pipe fitting 7-6 of chamber VII-II;

[0089] An oil removal element VII7-12 is provided in chamber VII-III, and the oil removal element VII7-12 is connected to an oil removal cloth water pipe 7-13, and the oil removal cloth water pipe 7-13 is connected to the chamber VII-III water inlet distribution pipe 7-9.

[0090] It should be noted that the total water outlet is connected by the outlet VII pipe fitting 7-14.

[0091] It needs to be said that if Figure 7 The tank body VII7-1 is also provided with a chamber VII-I backwash water inlet pipe fitting 7-3, a chamber VII-I water outlet pipe fitting 7-5, a chamber VII-II backwash water inlet pipe fitting 7-7, a chamber VII-III water inlet distribution pipe fitting 7-9, a crude oil collection bag VII interface pipe fitting 7-10, a chamber VII-III backwash water inlet pipe fitting 7-11, a steam intake pipe 7-15, a chamber VII-I sewage outlet pipe fitting 7-16, a chamber VII-II sewage outlet pipe fitting 7-17, a saddle VII7-18, and a chamber VII-III sewage outlet pipe fitting 7-19.

[0092] It should be noted that the interface coalescence fine purification S-type device 6 and the interface coalescence fine purification H-type device 5 are also filled with purification elements. The purification elements filled in the interface coalescence fine purification S-type device 6 and the interface coalescence fine purification H-type device 5 are strongly hydrophilic and oleophobic interfacial active materials with a porosity of 46%-47% and a density of 1.6 g / cm 3 -1.8 g / cm 3 , with a specific surface area greater than 2 x 104 cm 3 / g, the contact angle of the strongly hydrophilic and oleophobic surfactant with water is 0°, and the contact angle with oil is greater than 150°.

[0093] It should be noted that the dehydration element II-II2-18 and the dehydration element III-I3-12 are respectively the same as the oil removal element IV-I4-11, the oil removal element IV-III4-13 and the oil removal element IV-II4-8 used for removing oil from produced water in oil fields.

[0094] It should be noted that the surfaces of dehydration element II-II2-18, oil removal element IV-I4-11 and oil removal element IV-III4-13 are modified with a large number of papillary structures, which are high molecular organic materials with super oleophilic and hydrophobic properties, and have low surface energy and relative roughness. When the produced fluid (produced water) flows through the surfaces of dehydration element II-II2-18, oil removal element IV-I4-11 and oil removal element IV-III4-13, due to the papillary particles on them, the produced fluid (produced water) is forced to continuously change the flow rate and direction. Under the combined action of collision agglomeration and wetting agglomeration, due to the difference in oil-water density, the water-containing crude oil and free water are completely separated.

[0095] It should be noted that the dehydration element III-I3-12 and the oil removal element IV-II4-8 are materials with a strongly oleophilic and hydrophobic spatial network structure. When the water-containing crude oil (oil-containing wastewater) comes into contact with the material, the oleophilic filaments in the spatial network structure will continuously capture the oil droplets in the mixture. As the oil droplets are continuously captured and grow, the oil droplets aggregate. At the same time, when the water-containing crude oil (oil-containing wastewater) passes through the dehydration element III-I3-12 and the oil removal element IV-II4-8, the aggregated oil droplets begin to collide to form an oil film, which accelerates the speed of forming the oil layer, and finally makes the oil phase with a density less than that of the water phase float up and enter the oil aggregation bag. The low-water-content crude oil is dehydrated to purified oil, and the oil in the produced water is deeply removed.

[0096] It should be noted that the purification element VII7-4 has high porosity, high selectivity, low density, stable mechanical properties and bidirectional super oleophilic and super hydrophilic properties. When the oily wastewater flows through the purification element VII7-4, the oily wastewater preferentially contacts the super hydrophilic material due to "crowding" under a certain pressure. At this time, the water phase can penetrate through the high-porosity purification element VII7-4, while the oil phase adheres to and accumulates with the oleophilic material. Under the turbulent collision of the liquid, the aggregation and growth of the oil droplets are accelerated, and the penetration of the water droplets is accelerated. Under the action of the shear force of the liquid, the oil film formed on the surface of the purification element VII7-4 sinks, thereby achieving the deep removal of oil from the oily wastewater.

[0097] It should be noted that the utility model is a purely physical treatment process, and no demulsifying agent is added during the whole process of produced liquid treatment, and no water purification agent is added during the whole process of produced water treatment.

[0098] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A rapid separation and processing device for oilfield produced fluid, characterized in that: It includes produced liquid buffer tank, oil-gas-water mixed transmission pump, produced liquid rapid separation device, crude oil rapid deep separation device, water unloading pool, purified oil tank, water inlet lifting pump, high-efficiency oil removal rapid separation device, interface coalescence fine purification H-type device, interface coalescence fine purification S-type device, interface coalescence fine purification C-type device and purified water tank; The produced liquid buffer tank is connected to the input end of the oil-gas-water mixed flow pump, and the output end of the oil-gas-water mixed flow pump is connected to the produced liquid rapid separation device, and the produced liquid rapid separation device is respectively connected to the crude oil rapid deep separation device and the water unloading tank, and the produced liquid rapid separation device is also connected to the on-site natural gas purification system, the crude oil rapid deep separation device is connected to the purified oil tank, the water unloading tank is connected to the input end of the water intake lift pump, and the output end of the water intake lift pump is connected to the high-efficiency oil removal rapid separation device, and the high-efficiency oil removal rapid separation device is respectively connected to the interface coalescence fine purification H-type device and the interface coalescence fine purification S-type device, the interface coalescence fine purification H-type device and the interface coalescence fine purification S-type device are both connected to the interface coalescence fine purification C-type device, and the interface coalescence fine purification C-type device is connected to the purified water tank.

2. The oilfield produced fluid rapid separation and processing device according to claim 1, characterized in that: The produced liquid buffer tank is provided with a feed inlet pipe fitting, a discharge outlet pipe fitting, an exhaust port I pipe fitting and a sewage outlet I pipe fitting.

3. The oilfield produced fluid rapid separation and processing device according to claim 1, characterized in that: The produced liquid rapid separation device comprises a tank body II, on which a produced liquid inlet pipe is arranged, and inside of the tank body II are sequentially arranged a buffer baffle, a metal mesh filler, a dehydration element II-I and a dehydration element II-II; The position of the produced liquid inlet pipe piece corresponds to that of the buffer baffle; An oil-water interface flow stabilizer is arranged inside the tank body II, an oil-water interface level meter is installed on the tank body II through an oil-water interface level meter interface pipe fitting, a water outlet pipe fitting is installed on the tank body II, a vortex preventer is installed on the water outlet pipe fitting, and a crude oil gathering bag and an oil discharge pipe fitting are installed on the top of the tank body II.

4. The oilfield produced fluid rapid separation and processing device according to claim 1, characterized in that: The crude oil rapid deep separation device comprises a tank body III, on which a low-water crude oil inlet pipe is arranged, and inside of the tank body III are arranged an oil inlet distributor, a dehydration element III-I, an oil collecting tank and a dehydration element III-II in sequence; The low-water crude oil inlet pipe is connected to the oil inlet distributor, the oil inlet distributor is connected to the dehydration element III-I, the dehydration element III-I is connected to the oil collecting tank, and the oil collecting tank is connected to the dehydration element III-II; The top end of the dehydration element III-II is connected to an oil collection pipe, and the bottom end is connected to a water collection pipe; The tank body III is also provided with an oil outlet pipe fitting and a water outlet III-II pipe fitting, and the oil collecting pipe and the water collecting pipe are respectively connected to the oil outlet pipe fitting and the water outlet III-II pipe fitting; The tank body III is externally connected to an electric heating device through an electric heater interface pipe.

5. The oilfield produced fluid rapid separation and processing device according to claim 1, characterized in that: The high-efficiency oil removal and rapid separation device comprises a tank body IV, the tank body IV is provided with a water inlet IV pipe fitting, a water inlet distribution pipe is arranged inside the tank body IV, and the water inlet IV pipe fitting is connected to the water inlet distribution pipe; The interior of the tank IV is divided into a first compartment, a second compartment and a third compartment in sequence; The water inlet distribution pipe is located in the first bin; The first bin is also provided with an oil removal element IV-I, and the water inlet distribution pipe is connected to the oil removal element IV-I; The second chamber is provided with an oil removal element IV-II and connected to the oil removal element IV-I, and the top of the oil removal element IV-II is connected to a water collecting pipe; The third bin is provided with an oil removal element IV-III, and the bottom end of the oil removal element IV-III is connected to the third bin water distribution pipe; The third bin water distribution pipe is connected to the water collection pipe through a bin connecting pipe.

6. The oilfield produced fluid rapid separation and processing device according to claim 1, characterized in that: The interface coalescence fine purification H-type device comprises a tank body V, a sewage branch pipe is arranged on the left side of the tank body V and is connected to the sewage main pipeline on site, an air wash air inlet pipe fitting is arranged on the right side, a water outlet V pipe fitting is arranged at the lower end and a water wash water inlet pipe fitting is arranged on the water outlet V pipe fitting, a water inlet V pipe fitting and an air wash exhaust pipe fitting are arranged at the top, and a backwash water outlet pipe fitting is arranged on the water inlet V pipe fitting; The structure and connection relationship of the interface coalescence fine purification S-type device and the interface coalescence fine purification H-type device are consistent.

7. The oilfield produced fluid rapid separation and processing device according to claim 1, characterized in that: The interface coalescence fine purification type C device comprises a tank body VII, the interior of the tank body VII is divided into three parts: chamber VII-I, chamber VII-II and chamber VII-III, and the tops of the chambers VII-I and VII-II are respectively provided with chamber VII-I water inlet distribution pipe fittings and chamber VII-II water inlet distribution pipe fittings; The chamber VII-I is provided with a purification element VII, the water inlet and water distribution pipe of the chamber VII-I is connected to the purification element VII in the chamber VII-I, and the purification element VII in the chamber VII-I is connected to the water inlet and water distribution pipe of the chamber VII-I; The purification element VII is also provided in the chamber VII-II, the water inlet and water distribution pipe of the chamber VII-II is connected to the purification element VII in the chamber VII-II, and the purification element VII in the chamber VII-II is connected to the water outlet pipe of the chamber VII-II; An oil removal element VII is arranged in the chamber VII-III, and the oil removal element VII is connected to an oil removal cloth water pipe, and the oil removal cloth water pipe is connected to the water inlet and water distribution pipe fitting of the chamber VII-III.

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