CN205095472U - Subside and remove oil tank and extraction water processing system - Google Patents

Abstract

The utility model discloses a subsidence oil removal tank and a produced water treatment system. The subsidence oil removal tank includes a tank body, and the tank body is provided with a central pipe column, a water distribution chamber, an oil collection tank and a mud discharge device at the bottom of the tank body; In the tank and at least the lower end is sealed. The upper part of the central column is connected with the first water outlet pipe, and the lower part is connected with multiple water collection pipes. The water collection pipes are provided with water inlets; the water distribution chamber is connected with multiple water distribution pipes and the first water inlet. The water pipe and the water distribution pipeline are provided with a water outlet; the oil collecting tank forms a ring around the inner wall of the tank body. The settling oil removal tank of the utility model adopts a vertical vertical flow storage tank, and a uniform water collection and distribution system is set up, so that oil, water and suspended solids in the water are naturally separated due to different densities in the vertical flow state. The produced water treatment system of the utility model is composed of a subsidence oil removal tank for primary treatment and a chemically adjusted cyclone reaction separation device for secondary treatment. After two-stage treatment, the produced water contains oil and suspended matter within 15 mg/L. .

Description

Settling oil removal tank and produced water treatment system

technical field

The utility model belongs to the technical field of heavy oil produced water treatment for surface engineering of oil field development, and is particularly applied to produced water with high temperature, low oil-water density difference and high emulsification degree produced in the development of SAGD (Steam Assisted Gravity Drainage) heavy oil at home and abroad. Processing.

Background technique

At present, the internationally accepted oilfield produced water treatment technologies mainly include gravity sedimentation deoiling, air flotation, cyclone degreaser, filtration and other deoiling processes. The effluent is desalinated and softened before being used as boiler feed water. Due to the high temperature of produced water in heavy oil exploitation, it is not suitable for biological treatment. The main physical and physicochemical treatment methods are:

Physical method: The physical method mainly uses physical principles to separate impurities such as oil and solid suspended particles in water. The physical method mainly includes gravity sedimentation separation method, cyclone degreaser removal method, advection degreasing tank separation and filtration method.

Physical and chemical methods: When there are dispersed oil, emulsified oil, and suspended solids in the form of dispersed, dissolved, and colloidal substances in the produced water, they cannot be removed by physical methods alone, and a combination of chemical and physical methods is required. It mainly includes coagulation sedimentation, air flotation method, chemical agent reaction tank and other methods.

Generally, the oil content of the influent of the produced water treatment system is 2000ppm, and the suspended solids are 300ppm. The total output water requirement of the system is that both the oil content and suspended solids are lower than 5ppm. The common process flow of the produced water treatment system is oil removal tank + air flotation machine + filter , the processing facilities for each process are slightly different. At present, there are mainly two problems. One is that the treatment efficiency of the first-stage oil removal tank needs to be further improved. The other is that a more efficient and stable treatment process needs to be applied to make up for the shortcomings of the pure physical method. The characteristics and shortcomings of the existing technology as follows:

At present, the oil removal tank is used as the first-level treatment facility of the oil removal process. It accepts the raw water quality of the produced water with an oil content of 2000ppm and a suspended solid of 300ppm. The oil rate is generally up to 90%, and the removal rate of suspended solids is up to 50%, but the investment is less than the back-end air flotation and filter, which is the primary concern for the standard operation of the oil removal system. The water quality of the total system effluent is affected by the back-end air flotation and filtration equipment due to the substandard effluent of the oil removal tank, which will damage the desalination facilities such as the MVC (falling film evaporation desalination) at the back end, and will lead to high maintenance costs . Therefore, ensuring the treatment effect of the oil removal tank at the forefront of the entire oil removal process and desalination process as the first-level treatment facility is the key to reducing the pressure of the back-end treatment and ensuring the stable operation of the back-end. At present, there are two main types of degreasing tanks commonly used abroad:

Horizontal flow degreasing tank: the degreasing tank is a horizontal flow type, and a vertical baffle is installed inside the tank, which divides the tank body into several parts, and the adjacent parts are provided with flow passages, forming a horizontal baffle type degreasing tank as a whole . Due to the separation of several parts, a longer flow channel is formed in the limited circumferential cross-sectional area of the tank. When the water flows through, the oil droplets float up to the upper part of the liquid surface because the density is lower than that of water. From the water inlet to the water outlet, the larger The oil droplets with particle size complete the whole process of floating in turn, and are collected and discharged at the top of the oil removal tank. The smaller oil droplets fail to complete the floating removal process due to the small floating speed and enter the next stage of the process with the water flow.

Ordinary vertical flow degreasing tank: the degreasing tank is a vertical degreasing tank, and the water flow is generally vertical. After distribution, it flows vertically downward, and finally enters the water collection port at the bottom of the tank to be collected and then discharged out of the tank.

These oil removal tanks for produced water only take into account the floating effect of oil droplets brought about by the difference in density between oil and water, but have not made fundamental improvements in terms of coarse-grained oil droplets and increased floating speed, and are less adaptable to incoming water fluctuations. Poor, it needs to be optimized for uniform collection and distribution of water, improvement of water flow state in the tank, improvement of mud discharge method, etc.

On the other hand, the produced water treatment process of most foreign oilfields is relatively simple, mainly the physical process, namely the air flotation process, which has poor adaptability to the fluctuation of incoming water and the difference in water quality. The situation that the filter material is polluted and shut down occurs from time to time, and there is no special solution to system corrosion and scaling, the cost of chemicals is high, and the coagulation reaction and sedimentation process of chemicals currently used is immature and not suitable for oilfield production. The construction of effluent treatment projects requires efficient treatment and stable water quality up to the standard.

In summary, the produced water treatment in the prior art mainly has the following problems:

1) In terms of oil removal tank:

a. Uneven water collection and water distribution: The above two oil removal tanks adopt the method of large water inlet at the water inlet. When the water flow enters the tank, the disturbance is relatively large. Without uniform water distribution, the flow state of the water will be affected, and turbulence will be formed in the water. The shear force in multiple directions of the disturbed water flow causes the oil droplets to have speeds in other directions besides the buoyancy brought about by the buoyancy force, which affects the floating height in a limited time. Therefore, under the requirements of the designed oil removal rate, the increase dwell time requirements. Moreover, the lack of uniform water distribution also reduces the ability to adapt to the impact of incoming water. It is easy to cause agglomerated crude oil to enter the oil removal tank without being distributed, and directly enter the lower-end process due to insufficient settling capacity, causing pollution to the lower-end equipment. The water after degreasing is not uniformly collected, so it is easy to form a short flow, and the place with poor flow state near the outlet of the water outlet is easy to accumulate dirty oil and sludge, resulting in fluctuations in the quality of the effluent.

b. No efficient sludge discharge facilities: At present, there are no special sludge discharge facilities in these two types of oil removal tanks. The sediment, organic colloids and sludge deposited in water from the upstream will naturally settle to the bottom of the tank. The tank truck is removed by regular tank cleaning operation. When there is less sludge, only part of the bottom water of the tank is discharged, and when the sludge is large, the whole tank is cleaned. On the one hand, this operation method cannot remove all the sludge at the bottom of the tank, and the sludge on the other side of the tank cleaning port will still accumulate. On the other hand, when cleaning the tank, it needs to stop production, or generally two oil removal tanks need to be built, which increases investment. .

c. The flow state of the advection degreasing tank is not ideal. Because the water and the oil droplet flow in the same direction, the oil droplet has a horizontal forward speed due to the shear force of the water flow in addition to the buoyancy brought about by the buoyancy force, so the oil droplet actually follows a parabolic floating track. Because the water flow velocity is much greater than the floating velocity, within the limited floating height, the horizontal propulsion trajectory is longer, and the requirements for the length of the flow channel are higher. In the case of the same rising height, the cross-sectional area of the oil removal tank is increased, and the effective residence time is increased. extended accordingly.

2) In terms of process flow: the existing oil removal tank and air flotation process cannot ensure stable and qualified effluent water quality, and the pressure on the filter is relatively high. The dehydration effect of crude oil in some oilfields is not good, so that the sewage oil content is large, impacting sewage treatment facilities, the gravity degreasing of the front-end primary treatment and the air flotation and cyclone degreaser of the secondary treatment are unstable. With the large-scale promotion of various secondary and tertiary oil recovery technologies, the recovered water is mixed with the produced water treatment system for treatment, which increases the viscosity of the produced water, makes the emulsified oil more stable, and has a small oil-water density difference, which is difficult to achieve with air flotation and cyclone separators. Ideal effect. In terms of equipment, there are generally defects in the removal efficiency of small suspended solids and fine particle size oil. The above reasons will transfer the processing pressure to the filter, causing the blockage of the filter material to affect the processing effect, and the amount of oil coming from the front end is unqualified. However, the situation that the filter material is polluted and unable to operate occurs from time to time.

3) The produced water treatment system has no effective ion balance measures, and the problem of corrosion and scaling is serious. Since the deoiling tank + air flotation process only performs physical treatment on the produced water, the scaling ions such as calcium and magnesium in the water cannot be effectively reduced, the scaling problem of the deoiling system is prominent, and the cost of adding descaling agents is high.

4) The chemical treatment process needs to be optimized urgently. In view of the insufficiency of the physical process on the stability of the effluent and the anti-scaling ability, some oilfields have begun to use the process of chemical agent reaction tanks to solve the above problems. Integrated dosing reaction separation process and equipment. The flocculation reaction tank is expensive and difficult to construct. When chemical coagulation and sedimentation are used to treat oily sewage, it is necessary to add a large amount of water purification agents to form a large number of flocs. After the flocs settle, they become sludge and are directly discharged after sedimentation. The performance of water purification agents is not fully utilized. , and the formed flocs are loose, and the sludge settling performance is poor, which is not conducive to the subsequent sludge dehydration treatment, so the work efficiency is low, the work quality is poor, and the cost is high.

Utility model content

In view of the above-mentioned problems in the prior art, the technical problem to be solved by the utility model is to provide a settling oil removal tank capable of effectively removing oil and suspended solids in produced water.

In order to solve the above technical problems, the utility model adopts the following technical scheme: the subsidence degreasing tank, including the tank body,

The tank is provided with a hollow central pipe column, a water distribution chamber, an oil collection tank and a mud discharge device;

The central pipe column is vertically arranged in the tank body and at least the lower end is sealed, the upper part of the central pipe column communicates with the first water outlet pipe extending to the outside of the tank body, and the lower part communicates with a plurality of outlet pipes located in the tank body. A water collection pipeline, the water collection pipeline is provided with a water inlet;

The water distribution chamber is connected with a plurality of water distribution pipelines located in the tank and a first water inlet pipe extending to the outside of the tank, and a water outlet is arranged on the water distribution pipeline;

The oil sump forms a ring around the inner wall of the tank;

The mud discharge device is arranged at the bottom of the tank.

Preferably, each of the water distribution pipelines includes a main water distribution pipe perpendicular to the central column, a main water distribution branch vertically connected to the main water distribution pipe, and a main branch pipe connected to the main water distribution pipe. A plurality of water distribution branch pipes, each of which has the water outlet respectively.

Preferably, the water outlet is trumpet-shaped and opens upward.

Preferably, the water distribution chamber is sleeved on the central pipe column, and the plurality of water distribution main pipes of the plurality of water distribution pipelines are evenly distributed on the water distribution chamber.

Preferably, each of the water collection pipelines includes a main water collection pipe perpendicular to the central pipe column, a main water collection branch pipe vertically connected to the main water collection pipe, and a main branch pipe connected to the main water collection pipe There are a plurality of water collection branch pipes on the water collection branch pipe, and each of the water collection branch pipes has the water inlet respectively.

Preferably, the water inlet is trumpet-shaped and opens downward.

The utility model also discloses a produced water treatment system, which includes an oil removal tank and a chemical adjustment swirl reaction separation device, the oil removal tank is the above-mentioned settlement oil removal tank, and the first water outlet pipe is connected to the chemical adjustment Cyclone reaction separation device.

As a preference, the chemical adjustment cyclone reaction separation device is a cyclone reaction separation tank, the cyclone reaction separation tank includes a tank body and a cyclone reaction center tube vertically placed in the tank body, the cyclone reaction center The lower end of the cylinder communicates with the inner cavity of the tank, and the swirl reaction central cylinder is divided into the first-stage swirl reaction section, the second-stage swirl reaction section and the third-stage swirl reaction section from top to bottom. part;

The tank body is fixedly connected with a second water inlet pipe extending into the first-stage cyclone reaction section, a second water purification agent pipe extending into the second-stage cyclone reaction section, and a To the flocculant pipe in the third-stage cyclone reaction section, the second water inlet pipe is connected with the first water purification agent pipe;

The upper part of the tank is fixed with a water collecting pipe and an oil collecting pipe above the water collecting pipe. The water collecting pipe is provided with a water inlet, and the water collecting pipe is connected with a second outlet extending out of the tank. Water pipe; the oil collecting pipe is provided with an oil inlet, and the oil collecting pipe is connected with an oil outlet pipe protruding from the outside of the tank;

A mud discharge pipe is connected to the bottom of the tank;

The first water outlet pipe is connected to the second water inlet pipe.

Preferably, the water collecting pipe and the oil collecting pipe are ring-shaped, and both the water collecting pipe and the oil collecting pipe are set outside the swirl reaction central cylinder, and the water inlets are multiple evenly distributed on the water collecting pipe, The oil inlets are multiple evenly distributed on the oil collecting pipe.

Preferably, the axial direction of the second water inlet pipe is tangent to the inner wall of the cyclone reaction center cylinder.

As a preference, the chemical adjustment cyclone reaction separation device includes a cyclone reactor and a slag removal separation tank;

The cyclone reactor includes a tank body, and the tank body is provided with a partition for separating the tank body into a first-stage reaction chamber located at the lower part and a second-stage reaction chamber located at the upper part;

A water inlet is opened on the tank body corresponding to the first-stage reaction chamber, and a third water inlet pipe extending into the first-stage reaction chamber is arranged in the water inlet;

The tank body corresponding to the second-stage reaction chamber is provided with a water purification agent dosing port and a water outlet, and the water purification agent dosing port is provided with a drug dosing pipe extending into the second-stage reaction chamber, The water outlet is provided with a third water outlet pipe extending into the second-stage reaction chamber, the drug dosing pipe is located at the lower part of the second-stage reaction chamber, and the third water outlet pipe is located at the second The upper part of the reaction chamber;

A through hole is opened on the partition, and the through hole communicates with the medicament dosing pipe through a connecting pipe;

The bottom of the tank is provided with a sewage discharge pipe;

The third water inlet pipe is connected to the first water outlet pipe.

Preferably, the slag removal separation tank is a spray slag removal separation tank, and the spray slag removal separation tank includes a tank body, a central cyclone, a spray slag removal device, an oil collection device, a mud discharge device and a water collection device;

The central swirl cylinder is located in the tank with an open upper end, and the lower end is fixed and sealed with the tank body. An annular cavity is formed between the central swirl cylinder and the tank body. The center swirl cylinder The lower part has at least one communication port communicating with the inner cavity of the tank body, the middle part of the central swirl tube is connected with a fourth water inlet pipe, and one end of the fourth water inlet pipe is located in the central swirl tube, The other end is connected to the third outlet pipe;

The spray slag removal device is arranged outside the upper part of the central cyclone;

The oil collector is arranged on the inner wall of the tank corresponding to the upper end of the central cyclone;

The mud discharge device is arranged at the bottom of the tank corresponding to the communicating port;

The water collection device includes an external water tank and a water collection pipe installed on the outer upper part of the tank body. The water collection pipe includes a water collection ring pipe and an L-shaped guide pipe. The water collection ring pipe is located in the middle of the tank body and is placed on the Outside the central swirl tube; one end of the L-shaped guide pipe communicates with the water collection ring pipe, and the other end passes through the tank body and extends into the external water tank. The external water tank is connected with a second Four outlet pipes.

As a preference, a water level regulator is provided in the external water tank, and the water level regulator includes an outer cylinder, an inner cylinder for adjustment, a screw rod, a mounting frame, a handwheel and a handwheel seat, and the outer cylinder is fixed on the inner cylinder of the external water tank. bottom, the L-shaped guide pipe is located in the outer cylinder, the fourth outlet pipe is located outside the outer cylinder; the adjustment inner cylinder is set in the outer cylinder and can move up and down, and the adjustment The outer wall of the inner cylinder is kept sealed with the inner wall of the outer cylinder, the screw rod is fixed on the adjusting inner cylinder, the installation frame is located above the outer cylinder, and the lower end of the handwheel seat is installed on the On the installation frame, the upper end of the hand wheel seat is equipped with the hand wheel, and the middle part of the hand wheel is equipped with a nut capable of passing the screw mandrel.

Preferably, the axial direction of the fourth water inlet pipe is tangent to the inner wall of the central swirl tube, and the outlet of the fourth water inlet pipe is located on the inner wall of the central swirl tube; the oil collector is An annular groove formed around the inner wall of the tank body is connected with an oil collecting pipe extending out of the tank body.

Preferably, the spray slag removal device includes a slag collecting tank, a slag collecting hopper, a slag collecting pipe and a flushing water pipe;

The upper end of the central cyclone passes through the bottom surface of the slag collection tank and is located in the slag collection tank. The bottom surface of the slag collection tank is an inclined plane with one end high and the other end low;

The slag collecting hopper is arranged outside the bottom end of the slag collecting tank;

The slag collecting pipe is connected to the slag collecting hopper and extends out of the tank;

The upper end of the flushing water pipe is fixed above the central swirl tube, the spray nozzle is connected to the flushing water pipe, and the lower end of the flushing water pipe passes out of the tank.

As a preference, the slag removal separation tank is a negative pressure slag removal separation tank, the negative pressure slag removal separation tank includes a tank body and a cylinder body arranged in the tank body, the upper end of the cylinder body is open, and the lower end is connected to the The tank body is fixed and sealed, an annular cavity is formed between the cylinder body and the tank body, and the lower part of the cylinder body has at least one outlet communicating with the inner cavity of the tank body; The upper part is fixed with a slag collection funnel, the bottom of which is connected with a slag discharge pipe protruding from the outside of the tank; the middle part of the cylinder is connected with a fifth water inlet pipe; the upper inner wall of the tank body forms a ring-shaped An oil collection tank, the oil collection tank is connected with an oil collection pipe protruding from the outside of the tank; an annular packing layer is fixed in the middle of the ring cavity; an annular water collection pipe is arranged in the ring cavity above the packing layer, and the The fifth water outlet pipe extending out of the tank is connected to the water collection pipe; the bottom of the tank body is fixed with a first annular mud suction pipe located in the annular cavity, and a second annular mud suction pipe is fixed above the packing layer. Tube.

Compared with the prior art, the beneficial effects of the subsidence oil removal tank, the produced water treatment system and the treatment method of the present invention are:

1. The settling oil removal tank in this utility model adopts a vertical vertical flow storage tank, and a uniform water collection and distribution system is set up. Under the vertical flow state, the oil, water and suspended solids in the produced water are naturally separated due to different densities. It also has the functions of oil collection and mud discharge, thus greatly improving the work efficiency and work quality of produced water deoiling. Compared with the traditional advection oil removal tank, the oil removal efficiency is increased by about 40%, and the engineering investment is saved by about 30%, which effectively solves the problem of low processing efficiency of the oil removal tank in the prior art.

2. The produced water treatment system of the present utility model is mainly composed of a settling oil removal tank as the primary treatment and a chemically adjusted cyclone reaction separation device as the secondary treatment, which can make up for the deficiency of the pure physical method. Environmental protection requirements for standard reuse are becoming increasingly stringent, and the demand for stable water output from the produced water treatment system and effective prevention of corrosion and scaling is prominent. The cyclone reaction separation device is suitable for the treatment of produced water with small oil-water density difference, a certain amount of high-molecular organic matter or complex water. By adding water purification agents (chemical agents), the water properties of produced water can be improved, and the mixed reaction of oil, suspended solids and water purification agents can be realized through efficient reaction equipment, and the effective separation can be achieved to achieve water purification and water purification. Scaling and corrosive ions are controlled.

3. The utility model can be applied to the treatment of produced water with high temperature, low oil-water density difference and high emulsification degree produced in the development of SAGD heavy oil at home and abroad. After these two stages of treatment, the oil and suspended matter in the produced water can reach 15mg/L Within, the backend can be supplemented with filtering to meet the reuse requirements. It solves the problems of high temperature, low oil-water density difference, high emulsification degree, small particle size of produced water and oil beads, strong oil-water stability, and difficult conventional treatment process. It solves the problem of the outlet of produced water to meet the standard treatment and reuse boiler for the development of heavy oil, and avoids sewage The pollution of the environment is discharged outside, and at the same time, the saving of clean water produces huge economic benefits.

Description of drawings

Fig. 1 is a structural schematic diagram of a subsidence oil removal tank of the present invention.

Fig. 2 is a view along the line A-A in Fig. 1 .

Fig. 3 is a schematic structural view of the cyclone reaction separation tank in the produced water treatment system of the present invention.

Fig. 4 is a structural schematic diagram of the cyclone reactor in the produced water treatment system of the present invention.

Fig. 5 is a structural schematic diagram of the spray slag removal separation tank in the produced water treatment system of the present invention.

Fig. 6 is a structural schematic diagram of the negative pressure slag removal separation tank in the produced water treatment system of the present invention.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

As shown in FIG. 1 , the subsidence oil removal tank disclosed in the embodiment of the utility model includes a tank body 101 in which a hollow central column 102 , a water distribution chamber 103 , an oil collection tank 104 and a mud discharge device 105 are arranged. The central column 102 is vertically arranged in the tank body 101 and at least its lower end is sealed. In this embodiment, the lower end of the central column 102 is connected and sealed to the bottom of the tank body 101 , and the upper end is connected to and sealed to the top of the tank body 101 . The upper part of the central column 102 communicates with a first water outlet pipe 106 extending outside the tank body 101 , and the lower part communicates with a plurality of water collecting pipelines 107 inside the tank body 101 , and the water collecting pipelines 107 are provided with water inlets 108 .

The water distribution chamber 103 is connected with a plurality of water distribution pipelines 109 inside the tank body 101 and a first water inlet pipe 110 extending out of the tank body 101 , and a water outlet 111 is provided on the water distribution pipelines 109 . The oil sump 104 forms a ring around the inner wall of the tank body 101 . The opening of the oil collecting tank 104 is upward, and its cross section is U-shaped, see FIG. 1 for details. An oil outlet pipe 112 is communicated with the oil collecting tank 104 , and the oil outlet pipe 112 extends out of the tank body 101 . The mud discharge device 105 is disposed at the bottom of the tank body 101 .

As a preferred solution of the present utility model, in conjunction with Fig. 1 and with reference to Fig. 2, each water distribution pipeline 109 includes a water distribution main pipe 113 perpendicular to the central pipe column 102 and communicated with the central pipe column 102, vertically connected A water distribution main branch pipe 114 on the water distribution main pipe 113 and a plurality of water distribution branch pipes 115 connected to the water distribution main branch pipe 114, each water distribution branch pipe 115 has a water outlet 111 respectively. As shown in FIG. 1 , the water outlet 111 is trumpet-shaped and opens upward.

Continuing in conjunction with Fig. 1, in order to make the water distribution on the same cross section of the tank body 101 uniform, the water distribution chamber 103 should be arranged in the middle of the tank body 101, and the central column 102 in this embodiment is located in the middle of the tank body 101, and the water distribution chamber 103 It is arranged on the central pipe column 102 , and the water distribution chamber 103 in this embodiment is annular and sleeved on the central pipe column 102 . A plurality of water distribution main pipes 113 of a plurality of water distribution pipelines 109 are arranged on the water distribution chamber 103 in a uniform manner.

The water collection pipeline 107 adopts basically the same structure as the water distribution pipeline, that is, each water collection pipeline 107 includes a main water collection pipe that is perpendicular to the central pipe column 102 and communicates with the interior of the central pipe column 102, and is vertically connected to the main water collection pipe. A water collection main branch pipe and a plurality of water collection branch pipes connected to the water collection main branch pipe, each water collection branch pipe has a water inlet 108 respectively. The structure of the water collecting pipeline 107 can be understood with reference to FIG. 2 . The water inlet 108 is trumpet-shaped and opens downward.

The mud discharge device 105 is used to remove mud and sand deposits in the incoming liquid. The mud discharge device in this embodiment adopts a kind of oil tank sludge discharge device whose Chinese patent authorization announcement number is CN2516279Y.

In addition, as shown in Figure 1, an overflow pipe 117 with one end located outside the tank body 101 is arranged in the tank body 101, so that when the liquid level in the tank body 101 is too high, the water in the tank body 101 is drained through the overflow pipe 117. out of the tank body 101.

Below in conjunction with Fig. 1, the working process of the subsidence oil removal tank of the present utility model is introduced: the produced water flows into the water distribution chamber 103 through the first water inlet pipe 110, and then flows into the tank body 101 through the water distribution pipeline 109 and the water outlet 111. The larger oil droplets first float to the oil layer, and the smaller oil droplets flow down with the water. In the process of downward flow, some small oil droplets continuously collide and coalesce into large oil droplets due to the different floating speed in still water and the promotion of the water flow velocity gradient, and some oil droplets without floating ability pass through the water inlet with water 108 enters the water collection pipeline 107, then enters the central pipe column 102, and then flows out of the tank body 101 through the first water outlet pipe 106, and enters the next procedure; the floating oil in the oil layer flows into the oil collection tank 104, and then flows out through the oil outlet pipe 112; The sludge accumulated at the bottom of the body 101 enters the sludge discharge device 105 and is then discharged through the sewage pipe 116.

Through the above description of the subsidence oil removal tank, it can be seen that its beneficial effects are:

1) Since the water outlet 111 of the water distribution pipeline opens upwards, when the water flows out from the pipe mouth at a certain speed, the oil droplets will deal with the floating speed in the water due to their own buoyancy (due to the relative density difference between oil and water). , also driven by the upward vertical velocity of the water flow, the oil droplets will reach the oil layer faster, and the required separation and settlement time will be shortened.

2) The subsidence and degreasing tank in the utility model adopts the mode of upper water distribution and lower water collection. There is always a process of convective collision coalescence between the floating oil droplets whose diameter becomes larger due to collision coalescence and the oil droplets entrained by the water flow to flow downward. This process is very beneficial to the coalescence of small particles. The efficiency of convective collision coalescence depends on the number of oil droplets per unit volume. The more oil droplets per unit volume, the more chances of collision coalescence and the higher the efficiency.

3) Both the water inlet of the water collection pipeline and the water outlet of the water distribution pipeline adopt radial bell mouths, which can ensure the uniformity of water distribution and collection, and have the advantages of simple structure, convenient installation, not easy to block, and stable operation. The water flowing out from the water distribution pipeline is evenly distributed to the horizontal section of the tank body, and evenly collected and flowed out of the tank body. Since the water distribution pipeline is set in the form of a water distribution main pipe, a water distribution main branch pipe and multiple water distribution branch pipes, the outflowing water decreases gradually according to a certain speed gradient, which reduces the turbulence of the water entering the tank and will not cause turbulence. Affect the floating speed of oil, and make use of the coalescence of oil droplets.

The utility model also discloses a produced water treatment system, which includes an oil removal tank and a chemically adjusted swirling reaction separation device. 106 is connected to the chemical adjustment cyclone reaction separation device. The chemical adjustment cyclone reaction separation device is based on the characteristics of the produced water, screens out the water purification agent that needs to be added, and at the same time tests the water purification agent dosing interval and the mixing reaction intensity, and then uses the chemical adjustment to the turbulence of the cyclone reaction separation device. The eddy current field where the flow becomes smaller step by step provides power for the mixing of water purification agents and produced water in the process. After the reaction, the effluent will separate the reaction product flocs from the water by coagulation and sedimentation to realize water purification.

The chemical adjustment cyclone reaction separation device of the present utility model can be realized in the following two ways, one is a combined device, which is mainly aimed at the cyclone reaction separation tank under conventional water quality conditions; the second is a split device, It is mainly aimed at complex water, and consists of two parts: a cyclone reactor and a slag removal separation tank.

The chemical adjustment swirl reaction separation device adopts the swirl reaction separation tank shown in Figure 3, the swirl reaction separation tank includes a tank body 201 and a swirl reaction center cylinder vertically placed in the tank body 201, the upper end of the swirl reaction center cylinder Closed and opened with an oil and gas outlet 214, the lower end communicates with the inner cavity of the tank body 201, and the swirl reaction center cylinder is divided into the first-stage swirl reaction section 202, the second-stage swirl reaction section 203 and the second-stage swirl reaction section from top to bottom. Three-stage cyclone reaction section 204 . The tank body 201 is fixedly connected with the second water inlet pipe 205 extending into the first-stage cyclone reaction section 202, the second water purification agent pipe 207 extending into the second-stage cyclone reaction section 203 and the The flocculant pipe 208 in the third-stage cyclone reaction section 204 is connected with the first water purifying agent pipe 206 on the second water inlet pipe 205 . The top in the tank body 201 is fixedly provided with a water collecting pipe 209 and an oil collecting pipe 210 above the water collecting pipe. The water collecting pipe 209 is provided with a water inlet (not shown in the figure), and the water collecting pipe 209 is connected with a tank body 201 The outer second water outlet pipe 211; the oil collecting pipe 210 is provided with an oil inlet (not shown in the figure), and the oil collecting pipe 210 is connected with an oil outlet pipe 212 extending out of the tank body 201 . A mud discharge pipe 213 is connected to the bottom of the tank body 201 . The connection of the sedimentation oil removal tank, the water treated by the sedimentation oil removal tank enters the cyclone reaction separation tank through the first water outlet pipe 106 and the second water inlet pipe 205 for chemical treatment.

Continuing with Figure 3, in order to facilitate water collection and oil collection, the water collection pipe 209 and the oil collection pipe 210 are ring-shaped, and the water collection pipe 209 and the oil collection pipe 210 are fixedly sleeved outside the upper part of the cyclone reaction center cylinder, and the water inlets are evenly distributed on the There are multiple oil inlets on the water collecting pipe 209 , and there are multiple oil inlets evenly distributed on the oil collecting pipe 210 . In order to make the gas generated in the sewage discharge out of the tank body 201 , an exhaust port 215 is provided at the top of the tank body 201 .

In addition, the axial direction of the second water inlet pipe 205 is tangent to the inner wall of the cyclone reaction center cylinder. The way of tangential water inlet is adopted to make the water flow form a swirling flow state in the swirl reaction center tube, maintain a certain water flow velocity, so as to form a velocity gradient field, and further improve the effect of floc aggregation.

The water from the settling oil removal tank enters the first-stage cyclone reaction section 202 through the second water inlet pipe 205, and the water enters the first-stage cyclone reaction section 202 through the first water-purifying agent pipe 206 before entering the first-stage cyclone reaction section 202. The water purification agent reacts in the first-stage cyclone reaction section 202; oil and gas can be separated in the first-stage cyclone reaction section 202, and the separated oil and gas can be discharged into the tank body 201 from the oil-gas outlet 214 and The gas is discharged from the tank body 201 through the exhaust port 215 . Then enter the second-stage cyclone reaction section 203, add the second water purification agent to the second-stage cyclone reaction section 203 through the second water purification agent pipe 207, and flocculate again; finally, the water enters the third stage. In the first-stage cyclone reaction section 204, organic polymer flocculants are added to the third-stage cyclone reaction section 204 through the flocculant pipe 208 at the same time, and small flocs are formed by netting and adsorption; the initially formed loose flocs are passed through the cyclone The bottom of the reaction center tube enters the tank body 1, due to the upflow of water flow and gravity compression, the first-stage swirl reaction section 202, the second-stage swirl reaction section 203 and the third-stage swirl reaction section 204 are connected to the tank body. A sludge bed 216 is formed between the tanks 201 to continue filtering, fluttering and absorbing small flocs, while compressing the interstitial water between the sludge to form dense sludge and settle to the bottom of the tank 2011. After the sewage passes through the sludge bed, the residual potential of the water purification agent is fully utilized, the negative potential of the small oil droplets is reduced, and they are aggregated into large oil droplets to float up, enter the oil collecting pipe 210 at the top of the tank body 201, and then flow from the oil outlet pipe 212 is discharged; the purified water enters the water collecting pipe 209 and is discharged from the second outlet pipe 211; by regularly opening the valve on the mud discharge pipe 213 at the bottom of the tank body 201, the sludge can be discharged.

The cyclone reaction separation tank in the utility model has a reasonable and compact structure, can quickly and effectively purify sewage, remove sludge and collect oil droplets, thus greatly improving the working efficiency and quality of treating oily sewage.

The second split device of the chemically adjusted swirl reaction separation device in the produced water treatment system of the present invention includes a swirl reactor and a slag removal separation tank; as shown in Figure 4, the swirl reactor includes a tank body 301, A partition 307 is arranged in the tank body 301, and the partition board 307 divides the tank body 301 into a first-stage reaction chamber 302 located at the lower part and a second-stage reaction chamber 303 located at the upper part; corresponding to the tank body of the first-stage reaction chamber 303 301 is provided with a water inlet, and a third water inlet pipe 304 extending into the first stage reaction chamber 303 is arranged in the water inlet, and the third water inlet pipe 304 is connected with the first water outlet pipe 106 of the settling oil removal tank. The tank body 301 corresponding to the second-stage reaction chamber 303 is provided with a water purification agent dosing port and a water outlet, and the water purification agent dosing port is provided with a drug dosing pipe 305 extending into the second-stage reaction chamber 303. A third water outlet pipe 306 extending into the second-stage reaction chamber 303 is provided, the drug dosing pipe 305 is located at the lower part of the second-stage reaction chamber 303 and is close to the partition 307, and the third water outlet pipe 306 is located in the second-stage reaction chamber 303 the upper part. A through hole is opened on the partition 307 , and a connecting pipe 308 is arranged in the through hole, and the connecting pipe 308 communicates with the medicament dosing pipe 305 .

A through hole may be provided on the separator 307 instead of a connecting pipe 308 , and the water in the first-stage reaction chamber 302 directly enters the second-stage reaction chamber 303 . The connection pipe 308 is provided so that the water from the first-stage reaction chamber 302 can fully react with the water purification agent fed by the agent dosing pipe 305 .

In this embodiment, the third water inlet pipe 304 , the third water outlet pipe 306 and the medicament dosing pipe 305 are all arranged horizontally, while the connecting pipe 308 is arranged vertically.

As shown in Figure 4, the water from the first outlet pipe 106 of the settling oil removal tank enters the first stage reaction chamber 302 at the bottom of the cyclone reactor through the third water inlet pipe 304 after adding the first water purification agent, and the water purification After the medicament and sewage are fully mixed and reacted, they enter the second-stage reaction chamber 303 through the through hole on the partition 307, and connect with the medicament dosing pipe 305 when entering the second-stage reaction chamber 303, and the second-stage reaction chamber 305 is mixed into the sewage. Water purification agent, after the second water purification agent reacts with the first water purification agent, the water is fully mixed and reacted in the second reaction chamber 303, the flocs grow further, and the flocs settle to the bottom of the tank 301, and finally A small amount of slick oil and water pass through the third outlet pipe 306 and enter the slag removal separation tank for further treatment. The top of the cyclone reactor is provided with a safety exhaust port 310, and the bottom is provided with a sewage discharge port 309.

The slag removal separation tank in the produced water treatment system of the utility model can adopt a spray slag removal separation tank, and can also adopt a negative pressure slag removal separation tank.

As shown in Figure 5, the spray slag removal separation tank includes a tank body 401, a central cyclone 402, a spray slag removal device, an oil collection device, a sludge discharge device and a water collection device. The upper end of the central swirl tube 402 is open, and the lower end is fixed on the bottom of the tank body 401 and sealed. An annular cavity is formed between the central swirl tube 402 and the tank body 401. The lower part of the central swirl tube 402 has at least one The inner cavity of the central swirl tube 402 is connected to the communication port 403, and the middle part of the central swirl tube 402 is connected with a fourth water inlet pipe 404. One end of the fourth water inlet tube 404 is located in the center swirl tube 402, and the other end is connected with the third swirl reactor. Outlet pipe 306 is connected. The spray slag removal device is arranged outside the upper part of the central cyclone tube 402 . The oil collector is arranged on the inner wall of the tank body 401 corresponding to the upper end of the central swirl cylinder 402 . The mud discharge device is arranged at the bottom of the tank body 401 at a position corresponding to the communication port 403 . The water collection device comprises an external water tank 405 and a water collection pipe installed on the outer upper part of the tank body 401. The lower end of the water collection pipe is located in the tank body 401 and communicates with the tank body 401. The upper end of the water collection pipe communicates with the external water tank 405; the external water tank 405 A fourth water outlet pipe 406 is fixedly connected to the lower part.

The scum accumulated on the top of the tank body 401 can be continuously and effectively separated from the treated water by the spray slag removal device and the oil collector and discharged out of the tank body 401 . Moreover, the spray scum removal device can spray water mist to effectively remove scum, prevent the scum accumulated on the top of the tank body 401 from flowing out through the fourth outlet pipe 406, and reduce the impact of scum on the quality of the effluent and subsequent processes.

Continuing with FIG. 5 , the axial direction of the fourth water inlet pipe 404 is tangent to the inner wall of the central swirl tube 402 , and the outlet of the fourth water inlet pipe 404 is located on the inner wall of the central swirl tube 402 . The axial direction of the fourth water inlet pipe 404 is tangent to the inner wall of the central swirl tube 402, so that the water to be treated can enter the central swirl tube 402 along the tangent line, generating a high-speed vortex, and speeding up the mixing of the sewage to be treated and the water purification agent .

Continuing to refer to Fig. 5, the water collection pipe includes a water collection ring pipe 407 and an L-shaped guide pipe 408. The water collection ring pipe 407 is set outside the middle of the central swirl tube and fixed to the outer wall of the tank body 401 by ribs. The water collection ring pipe A plurality of water collection inlets 409 are uniformly arranged on the downward side of 407 . One end of the L-shaped guide pipe 408 communicates with the water receiving ring pipe 407, and the other end passes through the tank body 401 and extends into the external water tank 405. One end of the L-shaped guide pipe 408 located in the external water tank 405 (hereinafter the end is named as the upper end) is provided with a filter. The purified water first flows into the water receiving ring pipe 407 from the water receiving inlet 409, and then flows into the L-shaped lead pipe 408 from the water receiving ring pipe 407, which ensures that the tank body 401 pinches the purified water to flow out evenly.

As shown in Figure 5, a water level regulator is provided in the external water tank 405, and the water level regulator includes an outer cylinder 410, an adjustment inner cylinder (not shown in the figure), a screw rod 412, a mounting frame 413, a handwheel 414 and a handwheel seat 415, the outer cylinder 410 is fixed on the bottom of the external water tank 405, the upper end of the L-shaped guide pipe 408 is located in the outer cylinder 410, and the fourth outlet pipe 406 is located outside the outer cylinder 410; the adjustment inner cylinder is set in the outer cylinder 410 and can Move up and down, during the process of adjusting the movement of the inner cylinder, the outer wall of the adjustment inner cylinder is kept sealed with the inner wall of the outer cylinder 410, the screw rod 412 is fixed on the adjustment inner cylinder, and the mounting bracket 413 is set in the external water tank 405 and located on the outer cylinder 410 Above, the lower end of the handwheel seat 415 is fixedly installed on the mounting bracket 413, the upper end of the handwheel seat 415 is equipped with a handwheel 414, the middle part of the handwheel 414 is equipped with a nut, and the upper end of the screw mandrel 412 passes through the nut.

The water level regulator can adjust the height of the water level in the external water tank 405. During the production process, according to the actual demand for water quality and water quantity changes, the hand wheel 414 is turned to drive the screw rod 412 to move up and down, and the screw rod 412 drives the adjustable inner cylinder to slide up and down in the outer cylinder 410 , to adjust the water outlet height of the external water tank 405. When the oil discharge and slag discharge in the tank body 401 requires a high liquid level, the height of the inner cylinder can be adjusted to increase the water level of the external water tank 405; height, to facilitate the discharge of water in the tank body 401. Through the water level regulator, all floating oil in the tank body 401 is discharged through the oil collector, and will not stay and accumulate in the tank body 401, thereby further improving the quality of the effluent water.

The oil collection device in this embodiment is an annular oil collection groove 424 formed around the inner wall of the tank body 401. The cross section of the oil collection groove 424 is U-shaped with an upward opening, and the oil collection groove 424 is connected with an oil collection pipe extending outside the tank body 401. 416.

Continuing in conjunction with Fig. 5, the spray slag removal device includes a slag collecting tank 417, a slag collecting hopper 418, a slag collecting pipe 419 and a flushing water pipe 420; The hole passed through is sealed between the central cyclone cylinder 402 and the hole wall. The upper end of the central cyclone cylinder 402 is located in the slag collection tank 417. The bottom surface of the slag collection tank 417 is a slope with one end high and the other end low, that is, the The left end is low and the right end is high; the slag collecting hopper 418 is arranged outside the bottom end (ie the left end) of the slag collecting tank 417; , the slag collecting bucket 418 and the slag collecting pipe 419 are all connected. The upper end of the flushing water pipe 420 is fixed on the top of the central swirl tube 402, and the flushing water pipe 420 is connected with a spray nozzle, and the lower end of the flushing water pipe 420 passes out of the tank body 401 and is connected with running water.

Continuing with FIG. 5 , the spray nozzles in this embodiment include an upper spray nozzle 421 and a lower spray nozzle 422 . There are at least two upper spray nozzles 421, and they are uniformly installed around the upper end of the flushing water pipe 420, and a lower spray nozzle 422 is arranged on the flushing water pipe 420 below between two adjacent upper spray nozzles 421. The upper layer spray nozzle 421 and the lower layer spray nozzle 422 are two layers up and down and arranged in a dislocation, so that the flushing effect is better. During actual production and operation, when the thickness of the scum on the upper part of the central cyclone 402 is small and the density is light, only the lower spray nozzle 422 can be used; when the thickness of the scum is thick, the upper spray nozzle 421 and the lower spray nozzle 422 Can be used simultaneously.

As shown in Figure 5, the sludge discharge device can adopt a kind of oil tank sludge discharge device whose Chinese patent authorization announcement number is CN2516279Y. Its structure and principle will not be repeated here. In addition, an overflow pipe 423 is fixed inside the tank body 401 near the upper end of the slag collection tank 417, the upper port of the overflow pipe 423 communicates with the inner cavity of the tank body 401, and the middle part of the overflow pipe 423 passes through the tank body 401 Extending to the outside of the tank body 401, the lower end of the overflow pipe 423 is connected to the sewage treatment station's sewage line. When the incoming water volume of the fourth water inlet pipe 404 suddenly increases and exceeds the processing load of the spray slag removal separation tank in a short period of time, Excess water flows out of the tank body 401 from the overflow pipe 423, preventing untreated water from directly entering the external water tank 405, resulting in poor water quality.

The working process of the spray slag removal separation tank is introduced below in conjunction with Fig. 5: first, the produced water processed by the cyclone reactor enters the fourth water inlet pipe 404 through the third water outlet pipe 306, and then enters the water in the central cyclone cylinder 402. In the middle part, the water flow rotates inside the central cyclone 402 and flows downward. The produced water and the water purification agent are fully mixed and react to form oil residue. The oil residue is gradually separated from the treated water in the central cyclone 402 and moves upward. The oil residue on the top of the central cyclone tube 402 forms a scum layer; the floating oil generated by the reaction of the produced water and the water purification agent enters the oil collection tank 424 and is discharged out of the tank body 401 through the oil collection pipe 416 . Impurities such as silt and other impurities in the produced water, as well as sludge generated by the reaction of the produced water and the water purification agent are deposited at the bottom of the tank body 401 , collected by a negative pressure sludge discharge device and discharged outside the tank body 401 through the sludge discharge pipe 425 . The pressurized water from the flushing water pipe 420 is sprayed out through the spray nozzle, and the scum gathered on the top of the central cyclone 402 is blown into the slag collection tank 417, and the scum in the slag collection tank 417 moves along the bottom of the slag collection tank 417. The inclined surface gradually slides into the slag collecting bucket 418 and is discharged out of the tank body 401 through the slag collecting pipe 419 . Finally, the treated water flows into the tank body 401 through the communication port 403, and enters the regulating inner cylinder through the water collection ring pipe 407 and the L-shaped introduction pipe 408, and the water flowing out from the upper end of the regulating inner cylinder enters the external water tank 405, and passes through the second The four outlet pipes 406 are discharged into subsequent treatment equipment.

As shown in Figure 6, the slag removal separation tank is a negative pressure slag removal separation tank. The negative pressure slag removal separation tank includes a tank body 501 and a cylinder body 502 located in the tank body 501. The upper end of the cylinder body 502 is open, and the lower end is connected to the tank body. The body 501 is fixed and sealed, and an annular cavity 517 is formed between the tank body 501 and the cylinder body 502. The lower part of the cylinder body 502 has at least one outlet 503 communicating with the inner cavity of the tank body 501; the upper part of the cylinder body 502 is fixedly installed with Slagging funnel 504, the bottom of slagging funnel 504 is connected with slag discharge pipe 505 protruding from the tank body 501; the middle of cylinder body 502 is connected with fifth water inlet pipe 506, and fifth water inlet pipe 506 is along the tangential direction of cylinder body 502 Extend into the cylinder 502; the upper inner wall of the tank body 501 forms an annular oil collection tank 508, the cross section of the oil collection tank 508 is U-shaped, and the opening faces upwards, and the oil collection tank 508 is connected with an oil collection pipe extending outside the tank body 501 509; an annular packing layer 507 is fixed in the middle of the ring chamber 517, and an annular water collection pipe 510 is arranged in the ring chamber 517 above the packing layer 507, and the water collection pipe 510 is connected with a fifth outlet pipe 511 extending outside the tank body 501.

Continuing with FIG. 6 , the bottom of the tank body 501 is fixed with a first annular dredge pipe 512 located in the annular cavity 517 , and in this embodiment, there are two first annular dredge pipes 512 arranged up and down. A second annular dredge pipe 513 is fixed above the packing layer 507 . Suction holes are distributed on the lower bottom surfaces of the first annular dredge pipe 512 and the second annular dredge pipe 513 . The first annular mud suction pipe 512 and the second annular mud suction pipe 513 are respectively connected with a mud discharge pipe 514 extending out of the tank body 501 . The two first annular mud suction pipes 512 can be connected to share a mud discharge pipe 514 , or each can use a mud discharge pipe 514 . The first annular dredge pipe 512 and the second annular dredge pipe 513 have the same structure and are well-known and commonly used devices in the prior art, and will not be repeated here.

In addition, as shown in Figure 6, an overflow port is provided in the tank body 501 above the annular water collection pipe 510, and an overflow pipe 515 is fixedly connected to the overflow port. , can be discharged out of the tank through the overflow pipe 515 to prevent untreated water from directly entering the water collection pipe 510 and affecting the quality of the effluent. Moreover, an annular retaining ring 516 is fixed on the inner wall of the middle part of the tank body 501 , and the packing layer 507 is seated on the annular retaining ring 516 , and the annular retaining ring 516 plays a role of supporting, fixing and limiting the packing layer 507 . A U-shaped ventilation balance pipe 217 is fixedly installed on the packing layer 507, and the U-shaped ventilation balancing pipe 217 passes through the packing layer 507 so that a part thereof is located at the top of the packing layer 507, and a part is located at the bottom of the packing layer 507. The U-shaped ventilation balance pipe 217 is used to balance the pressure between the upper and lower annular chambers 517 of the packing layer 507 to prevent pressure from being suppressed.

The filler layer 507 can be made of ethylene-propylene copolymer slanted plate filler layer. The ethylene-propylene copolymer slanted plate has excellent chemical properties, good stability, small specific gravity, smooth surface and good slippery effect, so as to avoid the phenomenon of filler breaking and loss.

The working process of the negative pressure slag removal separation tank is introduced below in conjunction with Fig. 6: the produced water treated by the cyclone reactor enters the fifth water inlet pipe 506 through the third water outlet pipe 306, and enters tangentially through the fifth water inlet pipe 506 In the cylinder 502, the produced water fully reacts with the water purification agent through the hydrocyclone in the cylinder 502, so that the flocs formed by the reaction float up to the water surface with the help of the dissolved gas released in the sewage to condense into scum, and the water in the lower part flows from the cylinder. The outlet 503 of 502 enters the annular cavity 517, and then the clear water separated by sedimentation passes through the packing layer 507 from bottom to top, and further intercepts the flocs in the water, so that the water is further purified after passing through the packing layer 507, and the purified water above the packing layer 507 The clear water enters the water collection pipe 510, and finally is discharged outside the tank body 501 through the fifth water outlet pipe 511. The floating scum first enters the slag collection funnel 504 and then is discharged out of the tank body 501 through the slag discharge pipe 505 . The floating oil is collected by the oil collection tank 508 and discharged out of the tank body 501 by the oil collection pipe 509 . The sludge deposited on the bottom of the tank body 501 and on the top of the packing layer 507 is regularly discharged out of the tank body 501 through the first annular mud suction pipe 512 and the second annular mud suction pipe 513 respectively.

The utility model also discloses a method for treating produced water, which comprises the following steps:

1) Oil removal by sedimentation: The oil removal tank shown in Figure 1 is used to utilize the difference in density of oil, water, and suspended matter in the produced water. Most of the oil floats up and the suspended matter sinks and is naturally separated. The remaining small part of oil and Suspended matter proceeds to the next procedure;

2) Cyclone reaction deoiling: the produced water treated in step 1) enters the chemical adjustment cyclone reaction separation device as mentioned above, and adds 2-3 kinds of water purification agents to carry out chemical cyclone reaction, and the produced water The oil and suspended solids are effectively captured and aggregated by the water purification agent, the sludge sinks, the scum floats up, and is effectively separated to achieve the purification of the effluent water quality.

The produced water treatment method of the utility model utilizes two-stage treatment facilities, the first stage is the physical method treatment using the sedimentation oil removal tank, and the second stage is the chemical method treatment using the swirl reaction chemistry to adjust the swirl reaction separation device, so as to compensate The shortcomings of pure physical treatment can take into account both water purification and water quality stability, and meet the increasingly stringent environmental protection requirements for the standard reuse of produced water after treatment.

Specifically, the high-temperature produced water from heavy oil exploitation first enters the vertical vertical flow oil removal tank, and the oil removal tank is equipped with a uniform water collection and distribution system, and adopts the method of upper water distribution and lower water collection. The radial bell mouth ensures the uniformity of water distribution and collection. After the produced water flows out from the water distribution pipe at a certain speed in the vertical flow state, in addition to the oil’s own floating speed in the water, it is also pushed by the vertical speed of the water flow, so the oil will reach the oil layer faster, so The required separation and settling time is shortened. Moreover, the oil collides and coalesces in the process of rising to form floating oil droplets and directly becomes larger, and there is always a process of convective collision and coalescence between the oil droplets entrained by the water flow and flowing downwards during the upward floating process, so that the oil gathers Forming large oil droplets is more conducive to floating, shortening the floating time and improving the oil removal efficiency. The oil that floats up to the upper surface of the produced water enters the oil receiving tank on the tank wall of the settlement oil removal tank, and then is discharged out of the settlement oil removal tank. The sludge in the produced water settles to the bottom of the sedimentation oil removal tank and is discharged through a negative pressure sludge discharger.

The produced water treated by the settling oil removal tank enters the chemical adjustment cyclone reaction separation device, and according to the characteristics of the produced water, the water purification agent to be added is screened out, and the time interval of the addition and the mixing reaction intensity are tested at the same time, and then the chemical Adjusting the vortex field where the turbulent flow of the cyclone reaction separation device gradually becomes smaller provides power for the mixing of the water purification agent and the produced water in the process. After the reaction, the flocs of the reaction product are separated from the water by coagulation and sedimentation. Realize water purification. At the same time, a small amount of oil contained in the produced water floats up and is collected.

The chemically adjusted cyclone reaction separation device can be integrated (only one device, the cyclone reaction separation tank shown in Figure 3), or split (comprising two devices, namely the cyclone reaction separation tank shown in Figure 4). The combination of the cyclone reactor and the spray deslagging separation tank shown in Figure 5 or the negative pressure deslagging separation tank shown in Figure 6). For water containing polymers, ultra-heavy oil, and SAGD production, the oil beads have small particle size and high viscosity, and oil and water are not easy to separate; gas-containing production water is high in dissolved gas and unstable, and the above reasons are likely to cause flocs to float up and scum The long-term accumulation of layers on the top of the tank increases the thickness of the scum layer, and the scum flows out through the water outlet into the next process, causing the tank effluent to contain oil and suspended solids exceeding the standard, and bring treatment pressure to the latter process, as shown in Figure 5 The spray deslagging separation tank shown in. A slag collecting tank is set on the top of the tank, and a water mist nozzle is set in the center of the slag collecting tank. The scum is blown into the slag collecting tank by the spray, and then discharged out of the tank. The sludge settles to the bottom of the spray slag removal separation tank, and is discharged out of the tank through the negative pressure sludge discharge device. The negative pressure slag removal separation tank shown in Figure 6 relies on negative pressure to collect the scum that floats up to the liquid surface of the tank and discharges it out of the tank. The sludge settles to the bottom of the negative pressure slag removal separation tank and is discharged through negative pressure. The mud device is discharged out of the tank to ensure the quality of the effluent.

After the produced water undergoes two-stage treatment of the utility model, the oil and suspended solids in the effluent can reach within 15 mg/L, and the rear end can be supplemented with filtration to meet the reuse requirements. It solves the problems of high temperature, low oil-water density difference, high emulsification degree, small particle size of produced water, strong oil-water stability, and difficult conventional treatment process, so that the produced water generated in the development of heavy oil can be treated up to the standard and reused in the boiler, avoiding The produced water (sewage) produced in the development of heavy oil is discharged to pollute the environment, and at the same time, the clean water is saved to generate huge economic benefits.

Representative embodiments of the present invention have been described in detail. These detailed descriptions are not intended to limit the scope of the present invention. Those skilled in the art can make various modifications or equivalent replacements to the utility model within the spirit and protection scope of the utility model, and such modifications or equivalent replacements should also be deemed to fall within the protection scope of the utility model. Therefore, no combination of features in the foregoing detailed description is necessary to practice the invention in its broadest scope, and are instead taught only to particularly detailed representative embodiments of the invention. Furthermore, the various features taught in the specification may be combined in ways not specifically enumerated, in order to obtain additional useful embodiments of the invention.

Claims (16)

1. Settling oil removal tank, comprising a tank body, characterized in that, the tank body is provided with a hollow central pipe column, a water distribution chamber, an oil collection tank and a mud discharge device; The central pipe column is vertically arranged in the tank body and at least the lower end is sealed, the upper part of the central pipe column communicates with the first water outlet pipe extending to the outside of the tank body, and the lower part communicates with a plurality of outlet pipes located in the tank body. A water collection pipeline, the water collection pipeline is provided with a water inlet; The water distribution chamber is connected with a plurality of water distribution pipelines located in the tank and a first water inlet pipe extending to the outside of the tank, and a water outlet is arranged on the water distribution pipeline; The oil sump forms a ring around the inner wall of the tank; The mud discharge device is arranged at the bottom of the tank. 2. The settling oil removal tank according to claim 1, wherein each of the water distribution pipelines comprises a main water distribution pipe perpendicular to the central column, a main water distribution pipe vertically connected to the main water distribution pipe A water distribution main branch pipe and a plurality of water distribution branch pipes connected to the water distribution main branch pipe, each of the water distribution branch pipes has the water outlet respectively. 3. The settling oil removal tank according to claim 2, wherein the water outlet is trumpet-shaped and opens upward. 4. The settlement oil removal tank according to claim 2, characterized in that, the water distribution chamber is sleeved on the central column, and the multiple water distribution main pipes of the multiple water distribution pipelines are evenly distributed on the On the water distribution chamber. 5. The settlement oil removal tank according to claim 1, characterized in that, each of the water collecting pipelines comprises a water collecting main pipe perpendicular to the central column, a water collecting main pipe vertically connected to the water collecting main pipe A water collection main branch pipe and a plurality of water collection branch pipes connected to the water collection main branch pipe, each of the water collection branch pipes has the water inlet respectively. 6. The settling oil removal tank according to claim 5, wherein the water inlet is trumpet-shaped and opens downward. 7. Produced water treatment system, comprising oil removal tank and chemical adjustment cyclone reaction separation device, it is characterized in that, described oil removal tank is the sedimentation oil removal tank described in any one of claims 1 to 6, and the first A water outlet pipe is connected to the chemical adjustment cyclone reaction separation device. 8. The produced water treatment system according to claim 7, characterized in that, the chemically adjusted cyclone reaction separation device is a cyclone reaction separation tank, and the cyclone reaction separation tank includes a tank body and a vertically placed The swirl reaction center tube in the tank, the lower end of the swirl reaction center tube communicates with the inner cavity of the tank body, and the swirl reaction center tube is divided into the first-stage swirl reaction section from top to bottom , the second-stage swirl reaction section and the third-stage swirl reaction section; The tank body is fixedly connected with a second water inlet pipe extending into the first-stage cyclone reaction section, a second water purification agent pipe extending into the second-stage cyclone reaction section, and a To the flocculant pipe in the third-stage cyclone reaction section, the second water inlet pipe is connected with the first water purification agent pipe; The upper part of the tank is fixed with a water collecting pipe and an oil collecting pipe above the water collecting pipe. The water collecting pipe is provided with a water inlet, and the water collecting pipe is connected with a second outlet extending out of the tank. Water pipe; the oil collecting pipe is provided with an oil inlet, and the oil collecting pipe is connected with an oil outlet pipe protruding from the outside of the tank; A mud discharge pipe is connected to the bottom of the tank; The first water outlet pipe is connected to the second water inlet pipe. 9. The produced water treatment system according to claim 8, characterized in that, the water collecting pipe and the oil collecting pipe are ring-shaped, and the water collecting pipe and the oil collecting pipe are both sleeved outside the swirl reaction central cylinder, and the A plurality of water inlets are evenly distributed on the water collecting pipe, and a plurality of oil inlets are evenly distributed on the oil collecting pipe. 10. The produced water treatment system according to claim 8, characterized in that, the axial direction of the second water inlet pipe is tangent to the inner wall of the cyclone reaction central cylinder. 11. The produced water treatment system according to claim 7, characterized in that, the chemically adjusted cyclone reaction separation device comprises a cyclone reactor and a slag removal separation tank; The cyclone reactor includes a tank body, and the tank body is provided with a partition for separating the tank body into a first-stage reaction chamber located at the lower part and a second-stage reaction chamber located at the upper part; A water inlet is opened on the tank body corresponding to the first-stage reaction chamber, and a third water inlet pipe extending into the first-stage reaction chamber is arranged in the water inlet; The tank body corresponding to the second-stage reaction chamber is provided with a water purification agent dosing port and a water outlet, and the water purification agent dosing port is provided with a drug dosing pipe extending into the second-stage reaction chamber, The water outlet is provided with a third water outlet pipe extending into the second-stage reaction chamber, the drug dosing pipe is located at the lower part of the second-stage reaction chamber, and the third water outlet pipe is located at the second The upper part of the reaction chamber; A through hole is opened on the partition, and the through hole communicates with the medicament dosing pipe through a connecting pipe; The bottom of the tank is provided with a sewage discharge pipe; The third water inlet pipe is connected to the first water outlet pipe. 12. The produced water treatment system according to claim 11, characterized in that, the slag removal separation tank is a spray slag removal separation tank, and the spray slag removal separation tank comprises a tank body, a central swirl tube, a spray slag removal device, oil collection device, sludge discharge device and water collection device; The central swirl cylinder is located in the tank with an open upper end, and the lower end is fixed and sealed with the tank body. An annular cavity is formed between the central swirl cylinder and the tank body. The center swirl cylinder The lower part has at least one communication port communicating with the inner cavity of the tank body, the middle part of the central swirl tube is connected with a fourth water inlet pipe, and one end of the fourth water inlet pipe is located in the central swirl tube, The other end is connected to the third outlet pipe; The spray slag removal device is arranged outside the upper part of the central cyclone; The oil collector is arranged on the inner wall of the tank corresponding to the upper end of the central cyclone; The mud discharge device is arranged at the bottom of the tank corresponding to the communicating port; The water collection device includes an external water tank and a water collection pipe installed on the outer upper part of the tank body. The water collection pipe includes a water collection ring pipe and an L-shaped guide pipe. The water collection ring pipe is located in the middle of the tank body and is placed on the Outside the central swirl tube; one end of the L-shaped guide pipe communicates with the water collection ring pipe, and the other end passes through the tank body and extends into the external water tank. The external water tank is connected with a second Four outlet pipes. 13. The produced water treatment system according to claim 12, wherein a water level regulator is provided in the external water tank, and the water level regulator includes an outer cylinder, an inner cylinder for adjustment, a screw rod, a mounting frame, and a hand wheel and a handwheel seat, the outer cylinder is fixed on the bottom of the external water tank, the L-shaped guide pipe is located in the outer cylinder, and the fourth outlet pipe is located outside the outer cylinder; the adjustment inner cylinder is set It is inside the outer cylinder and can move up and down, and the outer wall of the adjustment inner cylinder is sealed with the inner wall of the outer cylinder, the screw rod is fixed on the adjustment inner cylinder, and the mounting bracket is located on the outer cylinder. Above the tube, the lower end of the handwheel seat is installed on the mounting frame, the upper end of the handwheel seat is installed with the handwheel, and the middle part of the handwheel is installed with a nut that can pass through the screw. 14. The produced water treatment system according to claim 12, wherein the axial direction of the fourth water inlet pipe is tangent to the inner wall of the central cyclone, and the outlet of the fourth water inlet pipe is located at the The inner wall of the central swirl tube; the oil collecting device is an annular groove formed around the inner wall of the tank body, and the annular groove is connected with an oil collecting pipe protruding from the outside of the tank. 15. The produced water treatment system according to claim 12, wherein the spray slag removal device comprises a slag collecting tank, a slag collecting hopper, a slag collecting pipe and a flushing water pipe; The upper end of the central cyclone passes through the bottom surface of the slag collection tank and is located in the slag collection tank. The bottom surface of the slag collection tank is an inclined plane with one end high and the other end low; The slag collecting hopper is arranged outside the bottom end of the slag collecting tank; The slag collecting pipe is connected to the slag collecting hopper and extends out of the tank; The upper end of the flushing water pipe is fixed above the central swirl tube, the spray nozzle is connected to the flushing water pipe, and the lower end of the flushing water pipe passes out of the tank. 16. The produced water treatment system according to claim 11, wherein the slag removal separation tank is a negative pressure slagging separation tank, and the negative pressure slagging separation tank includes a tank body and is arranged in the tank body The upper end of the cylinder is open, the lower end is fixed and sealed with the tank body, an annular cavity is formed between the cylinder body and the tank body, and the lower part of the cylinder body has at least one The inner cavity of the tank is connected to the outlet; the upper part of the cylinder is fixed with a slag collection funnel, and the bottom of the slag collection funnel is connected with a slag discharge pipe extending out of the tank; the middle part of the cylinder is connected with a second Five water inlet pipes; an annular oil collection tank is formed on the inner wall of the upper part of the tank body, and the oil collection tank is connected with an oil collection pipe protruding from the outside of the tank; an annular packing layer is fixed in the middle of the ring cavity; the An annular water collection pipe is arranged in the annular cavity above the packing layer, and the fifth water outlet pipe protruding from the outside of the tank is connected to the water collection pipe; the bottom of the tank body is fixed with a first annular suction pipe located in the annular cavity. A mud pipe, a second annular mud suction pipe is fixed above the packing layer.