CN209619060U - An oxidation flocculation treatment device for oil and gas field operation waste liquid - Google Patents

Abstract

The utility model discloses a kind of oilfield operation waste liquid oxidizing, flocculating processing units, the processing suitable for petroleum, wastewater from chemical industry.Device includes microvesicle jet flow cavitation oxidation reactor, cyclone-flocculation reaction chamber, it is vortexed flocculation reaction room and expansion chamber and foam collecting tank, microvesicle is generated through microvesicle jet flow cavitation oxidation reactor after waste liquid is pressurized by centrifugal pump and cavitation oxidation reaction occurs, tangentially enter cyclone-flocculation reaction chamber and generates cyclone-flocculation, vortex flocculation is generated into small vortex flocculation reaction room, aquatic particle or the flocculation of colloid vortex are generated into maelstrom flocculation reaction room and do plug flow movement upwards, overflow enters expansion chamber sedimentation at the top of device, it is discharged from waste liquid outlet, part wadding body overflow enters foam collecting tank discharge.And acted on using microvesicle contact medium, make microvesicle, the micro-floccule contact flocculation in vortex field, aquatic particle flocculation reaction granularity lower limit is small, and flocculation time is short, and operating cost is low, solves waste liquid and breaks the de- steady, flocculation problems of glue.

Description

An oxidation flocculation treatment device for oil and gas field operation waste liquid

technical field

The utility model relates to an oxidation flocculation treatment device for oil and gas field operation waste liquid, which is especially suitable for the flocculation reaction treatment of oil and gas field fracturing flowback liquid, drilling waste water, well washing waste water and acidification waste liquid, and also suitable for the treatment of petroleum and chemical waste water.

Background technique

In order to increase and stabilize production, oil fields will take various operational measures according to production needs, such as fracturing, acidizing, profile control, hot washing, etc. These measures will produce a large amount of oil and gas field waste liquid containing chemical substances. Oil and gas field operation waste fluids mainly include drilling waste fluids, acidizing and fracturing waste fluids, and mixed waste fluids of two or more of them. The types of pollutants are petroleum, COD, SS, volatile phenol, sulfide, cyanide, hexavalent chromium and arsenic, etc. The three pollutants of COD, SS and petroleum account for more than 95% of the total pollutant discharge. Oil and gas field operation waste liquid exists in a wide range, the discharge volume varies greatly, and the pollution components are complex and changeable, which will cause great harm to the production site and its surrounding environment.

The treatment requirements for fracturing flowback fluid in oilfields at home and abroad are mainly discharge up to the standard and reinjection utilization, and the methods used include physical methods, chemical methods, biological methods and combined processes. Domestic oilfield operation waste liquid is usually treated by coagulation, neutralization, oxidation, activated carbon adsorption alone or integrated treatment. Aiming at the water quality characteristics of oilfield waste liquid, there are many treatment technologies reported in the literature, but many technologies are still in the experimental research stage, and a treatment technology with large-scale application and win-win economic and environmental benefits has not been found so far. The composition of oilfield operation waste liquid is complex and the system is changeable. The use of a single technology can completely remove the pollutants in oilfield operation waste liquid, and the cost is high, and there is still a certain distance from the realization of industrial application.

Flocculation is the most widely used unit operation technology in conventional water treatment technology. It is an indispensable pretreatment link in the treatment process of petrochemical wastewater and oil and gas field pressure operation waste liquid. Its effect directly affects the treatment effect, operating conditions and costs of subsequent processes. . With the development of flocculation technology, it has been significantly improved and developed in terms of waste liquid treatment efficiency and scope of application. The water quality of industrial wastewater is becoming more and more complex. For example, refractory organic industrial wastewater has the characteristics of complex components, high concentration of organic matter, high toxicity, and many biodegradable substances. Oilfield fracturing flowback fluid has many types of pollutants, high content, and high degree of emulsification. and system stability. Therefore, it is urgent to strengthen the water treatment process, and the enhanced flocculation process needs to improve two technologies, one is to develop new high-efficiency flocculants, and the other is to develop high-efficiency flocculation reactors.

Contents of the invention

Technical problem: The purpose of this utility model is to overcome the deficiencies in the prior art, and to provide a flocculation reaction treatment method for oilfield operation waste fluids such as oil and gas field fracturing flowback fluid, drilling wastewater, well washing wastewater, and acidification waste fluid. The device is used to solve the problems of gel breaking, destabilization and flocculation pretreatment of oil and gas field waste liquid.

Technical solution: The utility model implements the above-mentioned oil and gas field operation waste liquid treatment device, including a centrifugal pump, an air-carrying vortex flocculation reactor and a microbubble jet cavitation oxidation reactor, and the air-carrying vortex flocculation reactor includes The swirl flocculation reaction chamber, the small vortex flocculation reaction chamber and the large vortex flocculation reaction chamber connected in sequence, the small vortex flocculation reaction chamber includes the small vortex flocculation reaction lower inverted cone section, the small vortex flocculation reaction chamber middle cone section and the small vortex flocculation reaction chamber. The upper inverted cone section of the flocculation reaction chamber; the microbubble jet cavitation oxidation reactor includes a self-priming microbubble generator and a cyclotron connected with the self-suction microbubble generator, and the outside of the air-carrying vortex flocculation reactor The settling chamber is set, and the top of the settling chamber is provided with a foam collection tank, and an annular distribution tank is provided above the outside of the settling chamber, and the outlet of the centrifugal pump is connected to the jet pipe through the annular distribution tank and the microbubble jet cavitation oxidation reactor The inlet of the microbubble jet cavitation oxidation reactor is connected with the outlet of the air-carried vortex flocculation reactor and the upward oblique cut inlet A of the swirl flocculation reaction chamber; the swirl flocculation reaction chamber is connected with the small vortex flocculation reaction chamber The lower inverted cone section of the reaction chamber is connected with a column-cone structure, and the upper inverted cone section of the small vortex flocculation reaction chamber is connected with the large vortex flocculation reaction chamber with a cone-column structure.

There is at least one self-priming microbubble generator and cyclotron.

The cyclone flocculation reaction chamber has at least one upward oblique entrance A, and the angle of the oblique entrance is 30-45°.

The lower inverted cone section of the small eddy current flocculation reaction chamber, the middle vertebra section of the small eddy current flocculation reaction chamber and the upper inverted cone section of the small eddy current flocculation reaction chamber are directly welded, and the cone of the lower inverted cone section of the small eddy current flocculation reaction chamber The angle α is 55-65°, the cone angle β of the vertebral section in the small vortex flocculation reaction chamber is 40-50°, and the cone angle β of the upper inverted cone section is 40-50°.

The large vortex flocculation reaction chamber is a cylinder, at least 3 layers of wedge-shaped eddy current members are welded on the inner wall of the cylinder, and there are at least 4 wedge-shaped eddy current members in each layer, which are distributed symmetrically and staggered. The center of the section.

The angle θ between the two slopes of the wedge-shaped vortex member is 10-15°, and the radial length of the wedge-shaped vortex member is 0.15-0.2 times the diameter of the cylinder in the large vortex flocculation reaction zone.

Beneficial effects: the utility model has the functions of oxidation and flocculation. For the fine-grained water particles in the waste liquid, the micro-bubble enhanced eddy current flocculation technology is adopted, and the contact medium effect of the micro-bubbles is fully utilized to make the micro-bubbles and micro-flocs in the vortex field Perform contact flocculation. During this process, the microbubbles participate in the flocculation reaction of suspended particles in the wastewater, which helps to form small and firm flocs; the flocs act as "nuclei" in the process of bubble precipitation, which contributes to the formation of microbubbles. Rapidly form and improve the collision and adhesion efficiency of microbubbles and destabilized colloids and floc particles. Due to the difference in collision kinetic energy, the air bubbles can adhere to the periphery of the floc, or they can squeeze out the free water in the floc and adhere to the inside. In the micro-bubble jet cavitation oxidation reactor of the device, the waste liquid is pressurized by a centrifugal pump to generate a high-speed jet, and passes through the self-priming bubble generator of the micro-bubble jet cavitation oxidation reactor to form a negative pressure zone, sucks in air and pulverizes into microbubbles, and then through the cyclotron to produce smaller microbubbles. During this process, a cavitation oxidation reaction is generated at the same time to oxidize and degrade the organic pollutants in the waste liquid. The waste liquid enters the swirl flocculation chamber tangentially from the middle and lower cylindrical section of the reactor to generate swirl flocculation reaction. The swirl flocculation reaction chamber and the vortex flocculation reaction chamber are connected by a column-cone structure, and the vortex flocculation reaction chamber is divided into a small vortex flocculation reaction chamber and a large vortex flocculation reaction chamber, which are also connected by a cone-column structure. The waste liquid first enters the small vortex flocculation reaction chamber with an inverted cone structure from the swirling flow flocculation reaction chamber. Due to the continuous expansion of the cone section, a recirculation zone is formed, and a large velocity gradient is generated on the flow layer interface between the upflow and the swirling flow. Vortices of different sizes are formed. The waste liquid enters the large vortex flocculation reaction chamber with a cylindrical section structure through the small vortex flocculation reaction chamber. Due to the change of the structure of the cone and column, a large vortex is formed in this area. The small-scale vortex generated in the flocculation reaction chamber of the vortex generator, the vortex causes the floc to flow back, and when the diameter of the vortex is close to the particle diameter, the generated aggregates can be protected from damage to the greatest extent. Large-size eddies cause water particles or colloids to generate plug flow motion. The waste liquid overflowing through the vortex flocculation reaction chamber enters the settling chamber, the fluid in this area is in a laminar flow state, the flow velocity is small, the flocs further grow and become dense, and the shear resistance is also gradually enhanced accordingly, forming a denser The flocs make it less breakable and settle better in this area. The main advantages are:

Microbubbles and microflocs are contacted and flocculated in the vortex field by using the action of microbubbles in contact with the medium. Micro-bubbles participate in the flocculation reaction of suspended particles in waste liquid, which helps to form small and firm flocs; flocs act as "nuclei" in the process of bubble precipitation, which helps the rapid formation of micro-bubbles and improves micro-bubbles. The collision adhesion efficiency of air bubbles with destabilized colloids and floc particles. It can oxidize and destabilize the organic pollutants in the waste liquid. The lower limit of the flocculation reaction particle size of the water body particles is small, the flocculation reaction time is short, and the operation cost is low. The utility model has the advantages of compact structure, convenient operation and good waste water treatment effect, and has wide practicability in the technical field.

Description of drawings

Fig. 1 is a schematic structural diagram of the oil and gas field operation waste liquid treatment device of the present invention.

Fig. 2 is a schematic diagram of the layout of vortex components in the large vortex flocculation reaction zone in Fig. 1 .

Fig. 3 is a schematic structural diagram of the eddy current member in Fig. 1 .

In the figure: 1-swirl flocculation reaction chamber; 2-lower inverted cone section of small vortex flocculation reaction chamber; 3-middle vertebral section of small vortex flocculation reaction chamber; 4-upper inverted cone section of small vortex flocculation reaction chamber; 5-large vortex Flocculation reaction chamber; 6-vortex member; 7-collection tank; 8-microbubble jet cavitation oxidation reactor; 9-self-priming microbubble generator; 10-cyclotron; 11-sedimentation chamber; 12-centrifugal pump; A - waste chamfered inlet; B-waste outlet; C-foam outlet.

Detailed ways

The utility model will be further described below in conjunction with the embodiment in the accompanying drawings:

The oil and gas field operating waste liquid treatment device of the utility model is mainly composed of an air-carrying vortex flocculation reactor, a microbubble jet cavitation oxidation reactor 8, and a centrifugal pump 12. The microbubble jet cavitation oxidation reactor 8 is composed of The suction type microbubble generator 9 and the cyclotron 10 connected to the self-suction type microbubble generator 9 constitute, and the self-suction type microbubble generator 9 and the cyclotron 10 are purchased parts, and the model is selected by required flow. The air-carried vortex flocculation reactor is composed of a swirl flocculation reaction chamber 1 and a flow flocculation reaction chamber. The flow flocculation reaction chamber is composed of a small vortex flocculation reaction chamber and a large eddy flocculation reaction chamber 5. The chamber includes the lower inverted cone section 2 of the small eddy current flocculation reaction chamber, the middle cone section 3 of the small eddy current flocculation reaction chamber and the upper inverted cone section 4 of the small eddy current flocculation reaction chamber. The large eddy current flocculation reaction chamber 5 is a cylinder, and the inner wall of the cylinder is welded There are at least 3 layers of wedge-shaped vortex members 6, and there are at least four wedge-shaped vortex members 6 in each layer, which are symmetrically distributed in a staggered manner. The angle θ is 10-15°, and the radial length of the wedge-shaped vortex member 6 is 0.15-0.2 times of the cylinder diameter of the large vortex flocculation reaction zone 5 . The outside of the air-carrying vortex flocculation reactor is equipped with a settling chamber 11, the top of the settling chamber 11 is provided with a foam collection tank 7, and the outer top of the settling chamber 11 is provided with an annular distribution tank, and the outlet of the centrifugal pump 12 The connecting jet pipe is connected to the inlet of the microbubble jet cavitation oxidation reactor 8 through the annular distribution groove, the outlet of the microbubble jet cavitation oxidation reactor 8 is connected to the microbubble jet cavitation oxidation reactor 8, and the inlet is connected to the self-priming microbubble jet cavitation oxidation reactor 8. The generator 9 is connected, and after passing through the cyclotron 10, the outlet is connected with the bottom injection pipe of the air-carried vortex flocculation reactor and the upward oblique cut inlet A of the swirl flocculation reaction chamber 1; the microbubble jet cavitation oxidation reactor 8 There is at least one, set according to the actual needs of the site, the example in Figure 1 is two, arranged in pairs. The cyclone flocculation reaction chamber 1 has at least one upward obliquely cut inlet A, which enters obliquely upward, and the angle of the obliquely cut inlet is 30-45°. The example in Fig. 1 is two upwardly obliquely cut inlets, arranged symmetrically. The lower inverted cone section 2 of the small eddy current flocculation reaction chamber, the middle vertebra section 3 of the small eddy current flocculation reaction chamber and the upper inverted cone section 4 of the small eddy current flocculation reaction chamber are directly welded, and the lower inverted cone of the small eddy current flocculation reaction chamber The cone angle α of section 2 is 55-65°, the cone angle β of vertebral section 3 in the small vortex flocculation reaction chamber is 40-50°, and the cone angle β of the upper inverted cone section 4 is 40-50°. The cyclone flocculation reaction chamber 1 is a cylinder, the cyclone flocculation reaction chamber 1 is connected with the lower inverted cone section 2 of the small vortex flocculation reaction chamber in a column-cone structure, and the upper inverted cone section 4 of the small vortex flocculation reaction chamber is connected with the The large vortex flocculation reaction chambers 5 are connected in a cone-column structure.

Working principle and working process: The waste liquid is pressurized by the centrifugal pump 12 to generate a high-speed jet, passes through the self-priming bubble generator of the microbubble jet cavitation oxidation reactor 8 to form a negative pressure zone, sucks in air and crushes it into microbubbles, and then passes through The cyclotron 10 generates a large number of microbubbles and undergoes cavitation oxidation reaction, so as to oxidize and degrade the organic pollutants in the waste liquid. The waste liquid then tangentially enters the cyclone flocculation reaction chamber 1 from the lower cylindrical section of the reactor, and then enters the lower inverted cone section 2 of the small vortex flocculation reaction chamber, the middle vertebral section 3 of the small vortex flocculation reaction chamber and the upper part of the small vortex flocculation reaction chamber. The inverted cone section 4 generates eddy flocculation reaction, and then enters the large eddy flocculation reaction chamber 5 to generate water particles or colloid vortex flocculation reaction, and performs plug flow movement, overflows at the top of the large eddy flocculation reaction chamber 5 and enters the settling chamber 11 after settling, from The waste liquid is discharged from the outlet B, and part of the floc foam overflows into the external foam collection tank 7 and is discharged through the foam outlet C. The swirl flocculation reaction chamber 1 is connected with the vortex flocculation reaction chamber in a column-cone structure, and the vortex flocculation reaction chamber is divided into a small vortex flocculation reaction chamber and a large vortex flocculation reaction chamber, which are also connected in a cone-column structure. The waste liquid first enters the small vortex flocculation reaction chamber with an inverted cone structure from the swirling flow flocculation reaction chamber. Due to the continuous expansion of the cone section, a recirculation zone is formed, and a large velocity gradient is generated on the flow layer interface between the upflow and the swirling flow. Vortices of different sizes are formed. The waste liquid enters the large vortex flocculation reaction chamber with a cylindrical section structure through the small vortex flocculation reaction chamber. Due to the change of the structure of the cone and column, a large vortex is formed in this area. Large-size eddies cause water particles or colloids to generate plug flow motion. The waste liquid overflowing through the vortex flocculation reaction zone overflows into the settling chamber 11, the fluid in this zone is in a laminar flow state, the flow velocity is small, the flocs further grow and become dense, and the shear resistance is also gradually enhanced accordingly, forming a higher density The flocs make it not easy to break and settle well in this area.

Claims (6)

1. a kind of oilfield operation waste liquid oxidizing, flocculating processing unit, including centrifugal pump (12), gas take formula vortex flocculation reactor With microvesicle jet flow cavitation oxidation reactor (8), it is characterised in that: it includes being sequentially connected that the gas of institute's art, which takes formula vortex flocculation reactor, Cyclone-flocculation reaction chamber (1), small vortex flocculation reaction room and maelstrom flocculation reaction room (5), the described small vortex flocculation is anti- Answering room includes inverted cone segment (2) under small vortex flocculation reaction room, vertebra section (3) and small vortex flocculation reaction in small vortex flocculation reaction room Inverted cone segment (4) on room；The microvesicle jet flow cavitation oxidation reactor (8) includes self-suction microbubble generator (9) and and self-priming The connected cyclotron (10) of formula microvesicle generators (9), the gas take the outer cover of formula vortex flocculation reactor equipped with sedimentation The top of room (11), expansion chamber (11) is equipped with foam collecting tank (7), and the external top of the expansion chamber (11) is equipped with annular distribution Slot, outlet connection jet pipe the entering through annular distribution groove and microvesicle jet flow cavitation oxidation reactor (8) of the centrifugal pump (12) Mouth is connected, and the outlet of microvesicle jet flow cavitation oxidation reactor (8) and gas take formula vortex flocculation reactor base injcction pipe and eddy flow The upward chamfered entrances A of flocculation reaction room (1) is connected；It is fallen under the cyclone-flocculation reaction chamber (1) and small vortex flocculation reaction room Section (2) are bored to be connected with column-wimble structure, on the small vortex flocculation reaction room inverted cone segment (4) and maelstrom flocculation reaction room (5) with Cone-rod structure is connected.

2. a kind of oilfield operation waste liquid oxidizing, flocculating processing unit according to claim 1, it is characterised in that: described Microvesicle jet flow cavitation oxidation reactor (8) at least one.

3. a kind of oilfield operation waste liquid oxidizing, flocculating processing unit according to claim 1, it is characterised in that: described The upward chamfered entrances A of cyclone-flocculation reaction chamber (1) is at least one, and the angle of chamfered entrances is 30~45 °.

4. a kind of oilfield operation waste liquid oxidizing, flocculating processing unit according to claim 1, it is characterised in that: described Inverted cone segment (2) under small vortex flocculation reaction room, back taper on vertebra section (3) and small vortex flocculation reaction room in small vortex flocculation reaction room It is directly welded between each cone section of section (4), the cone angle of inverted cone segment (2) is 55~65 ° under small vortex flocculation reaction room, small vortex wadding The cone angle beta of vertebra section (3) is 40~50 ° in solidifying reaction chamber, and the cone angle beta of upper inverted cone segment (4) is 40~50 °.

5. a kind of oilfield operation waste liquid oxidizing, flocculating processing unit according to claim 1, it is characterised in that: described big Being vortexed flocculation reaction room (5) is cylindrical body, and inboard wall of cylinder is welded at least 3 layers wedge shape vortex component (6), every layer of wedge shape vortex Component (6) is at least 4, is distributed in symmetrical alternating expression, and wedge shape is vortexed the apex angle side of component (6) towards the circle of cylindrical cross-section The heart.

6. a kind of oilfield operation waste liquid oxidizing, flocculating processing unit according to claim 5, it is characterised in that: described Two inclined-plane angle thetas of wedge shape vortex component (6) are 10~15 °, and wedge shape vortex component (6) radical length is maelstrom flocculation reaction 0.15~0.2 times of room (5) column diameter.