Tight gas fracturing flow-back fluid treatment device

Abstract

The utility model discloses a tight gas fracturing flow-back fluid treatment device which comprises an integrated reaction sedimentation tank, an oil separation tank is arranged on one side of the integrated reaction sedimentation tank, the oil separation tank is communicated with the integrated reaction sedimentation tank through an overflow groove, a dosing pipeline is arranged at the top of the integrated reaction sedimentation tank, and the oil separation tank is communicated with the integrated reaction sedimentation tank through an overflow groove. The utility model relates to the technical field of tight gas fracturing flow-back fluid treatment, the reaction tank and the sedimentation tank are combined, chemical reaction and solid-liquid separation processes are completed in the same equipment, the technological process is simplified, the space is saved, and the cost is reduced; the reaction tank and the sedimentation tank are integrated together, so that the occupied area of equipment can be reduced, the construction cost is reduced, the operation process is simplified, and the treatment efficiency is improved; by means of the design, the whole treatment process is more compact and efficient, and the device is suitable for large-scale treatment in a limited space.

Description

Technical Field

[0001] The utility model relates to the technical field of tight gas fracturing flowback fluid treatment, in particular to a tight gas fracturing flowback fluid treatment device. Background Art

[0002] In the process of tight gas extraction, a large amount of fracturing flowback fluid, production water, etc. will inevitably be produced. The fracturing fluid is injected into the ground to increase the gas production. However, the fracturing flowback fluid after use needs to be treated to meet the discharge standards or be reused. Generally, the fracturing flowback fluid contains a large amount of colloidal substances and difficult-to-degrade substances, which makes it present a relatively stable state. The removal of these colloidal substances is directly related to the overall process treatment effect, and the reuse of fracturing flowback fluid after treatment is a future development trend. The existing treatment methods mainly include chemical methods, membrane treatment methods, etc., but these methods have many shortcomings: Chemical method: Although it can achieve a certain treatment effect, the large-scale use of chemical agents will cause impurities such as iron ions and aluminum ions to remain in the water, affecting the quality of subsequent liquid preparation; Double membrane method: After pretreatment, it enters the membrane system to filter impurities, but due to the presence of sticky substances in the tight gas well flowback fluid, it is easy to cause the membrane component to be blocked, affecting production efficiency. In response to the above problems, the utility model proposes an improved solution, which aims to overcome the limitations of the existing technology and provide a more efficient, economical and environmentally friendly tight gas flowback fluid treatment device. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention provides a dense gas fracturing flowback fluid processing device, which solves the problems raised in the background art.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a tight gas fracturing flowback liquid processing device, comprising an integrated reaction sedimentation tank, a grease trap is provided on one side of the integrated reaction sedimentation tank, the grease trap and the integrated reaction sedimentation tank are connected through an overflow tank, a dosing pipeline is provided on the top of the integrated reaction sedimentation tank, a cyclone aeration mechanism is provided in the integrated reaction sedimentation tank, and the aeration head of the cyclone aeration mechanism is located inside the integrated reaction sedimentation tank and is arranged in a staggered manner in height;

[0005] Continuous baffled dielectric barrier low-temperature plasma reactors are symmetrically arranged on both sides of the integrated reaction sedimentation tank, one end of the reactor is connected to the discharge end of the external reflux pump arranged in the integrated reaction sedimentation tank, and the other end extends into the integrated reaction sedimentation tank;

[0006] The side of the integrated reaction sedimentation tank is provided with a multi-stage drain outlet;

[0007] A sludge hopper and a sludge discharge pipe are provided at the bottom of the integrated reaction sedimentation tank.

[0008] The continuous baffled dielectric barrier low-temperature plasma reactor comprises quartz tubes connected along a fold line, a stainless steel electrode is inserted into the quartz tube, a metal mesh is sheathed on the outside of the quartz tube, and a micro aeration system is connected to the bottom of the quartz tube.

[0009] The stainless steel electrode is connected to a high-voltage pulse AC power supply, the metal mesh is connected to a ground electrode, and the distance between the stainless steel electrode and the metal mesh is 5 to 10 mm.

[0010] The diameter of the stainless steel electrode is 3 cm.

[0011] The metal mesh is a 40-100 mesh stainless steel mesh or a metal copper mesh.

[0012] A mechanical stirring mechanism is provided in the above-mentioned grease trap.

[0013] The utility model provides a dense gas fracturing flowback liquid treatment device. It has the following beneficial effects: the dense gas fracturing flowback liquid treatment device combines a reaction tank with a sedimentation tank, completes the chemical reaction and solid-liquid separation process in the same device, simplifies the process flow, saves space and reduces costs. By integrating the reaction tank and the sedimentation tank, the equipment footprint can be reduced, the construction cost can be reduced, and the operation process can be simplified, and the treatment efficiency can be improved; this design makes the entire treatment process more compact and efficient, and is suitable for large-scale treatment in a limited space; low-temperature plasma technology is used to moderately oxidize the sewage to avoid excessive oxidation to produce harmful by-products, while ensuring water quality safety. Low-temperature plasma technology is an advanced oxidation technology that can produce highly active free radicals at lower temperatures and effectively decompose organic matter without causing secondary pollution. This method can not only improve the treatment effect, but also ensure that the treated water quality meets environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the dense gas fracturing flowback fluid processing device of the present invention.

[0015] Figure 2 This is a schematic diagram of the main cross-sectional structure of the dense gas fracturing flowback fluid processing device of the present invention.

[0016] Figure 3 This is a side structural schematic diagram of the dense gas fracturing flowback fluid processing device of the present invention.

[0017] In the figure: 1. Integrated reaction sedimentation tank; 2. Grease trap; 3. Dosing pipeline; 4. Cyclone aeration mechanism; 5. Aeration head; 6. Reactor; 7. External reflux pump; 8. Drain outlet; 9. Sludge hopper; 10. Sludge discharge pipe; 11. Quartz tube; 12. Stainless steel electrode; 13. Metal mesh; 14. Mechanical stirring mechanism; 15. Micro aeration system. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example: In conjunction with the specification Figure 1-3 It can be seen that the present application specifically designs a dense gas fracturing flowback liquid treatment device, including an integrated reaction sedimentation tank 1, an oil separator 2 is provided on one side of the integrated reaction sedimentation tank 1, the oil separator 2 and the integrated reaction sedimentation tank 1 are connected through an overflow tank, a dosing pipeline 3 is provided on the top of the integrated reaction sedimentation tank 1, a cyclone aeration mechanism 4 is provided in the integrated reaction sedimentation tank 1, and an aeration head 5 of the cyclone aeration mechanism 4 is located inside the integrated reaction sedimentation tank 1 and is arranged in a high-low staggered manner; continuous baffled medium barrier low-temperature plasma reactors 6 are symmetrically provided on both sides of the integrated reaction sedimentation tank 1, and one end of the reactor 6 is connected to the integrated reaction sedimentation tank 1. The external reflux pump 7 provided in the tank 1 is connected to the discharge end thereof, and the other end extends into the integrated reaction sedimentation tank 1; a multi-stage drain outlet 8 is provided on the side of the integrated reaction sedimentation tank 1, eliminating the traditional decanter design and replacing it with a multi-stage drain outlet 8 layout, which facilitates flexible control of the water discharge timing according to the supernatant situation; a sludge hopper 9 is provided at the bottom to facilitate the collection and transfer of sediment to the sludge dewatering machine for further treatment. The design of the multi-stage drain outlet 8 allows the operator to flexibly control the water discharge timing according to actual conditions, ensuring stable water quality; the sludge hopper 9 and the sludge discharge pipe 10 at the bottom facilitate the collection and transfer of sediment, further improving the treatment efficiency;

[0020] Combining the reaction tank with the sedimentation tank allows the chemical reaction and solid-liquid separation process to be completed within the same device, simplifying the process flow, saving space and reducing costs. By integrating the reaction tank with the sedimentation tank, the equipment footprint can be reduced, construction costs can be lowered, while simplifying the operating process and improving treatment efficiency. This design makes the entire treatment process more compact and efficient, suitable for large-scale treatment within a limited space. Low-temperature plasma technology is used to moderately oxidize wastewater to avoid excessive oxidation and the production of harmful by-products, while ensuring water quality safety. Low-temperature plasma technology is an advanced oxidation technology that can produce highly active free radicals at lower temperatures, effectively decomposing organic matter without causing secondary pollution. This method not only improves treatment results, but also ensures that the treated water quality meets environmental protection requirements.

[0021] The cyclone aeration heads 5 are provided at different heights, and their functions (such as aeration, stirring or mixing) can be adjusted according to actual needs to improve treatment efficiency. The cyclone aeration mechanism 4 can adjust the aeration intensity and mode according to different treatment stages. It can be used for both rapid oxygenation in the early stage and slow stirring and mixing in the later stage. This flexibility enables the system to better adapt to different treatment needs and improve overall treatment efficiency.

[0022] Equipped with comprehensive dosing facilities, the dosing line 3 supports the addition of various chemical reagents to meet the needs of various application scenarios such as coagulation, softening, and even advanced oxidation. The comprehensive dosing management system can accurately control the dosage and timing of the reagents, ensuring the treatment effect while reducing the waste of the reagents. In addition, the system also supports the addition of various types of chemical reagents to meet the treatment needs of different scenarios.

[0023] The continuous baffled dielectric barrier low-temperature plasma reactor 6 comprises a quartz tube 11 connected along a zigzag line. A stainless steel electrode 12 is inserted into the quartz tube 11, and a metal mesh 13 is mounted on the outside of the quartz tube 11. A micro-aeration system 15 is connected to the bottom of the quartz tube 11. The stainless steel electrode 12 is connected to a high-voltage pulsed AC power supply, and the metal mesh 13 is connected to a ground electrode. The spacing between the stainless steel electrode 12 and the metal mesh 13 is 5-10 mm. The diameter of the stainless steel electrode 12 is 3 cm. The metal mesh 13 is a 40-100 mesh stainless steel mesh or copper mesh. The baffled dielectric barrier low-temperature plasma reactor 6 is mounted on both sides, providing initial oxidation and decomposition of organic matter and destroying the colloidal structure, reducing wear on mechanical transmission components and extending service life. The baffled dielectric barrier low-temperature plasma reactor 6 utilizes the principle of dielectric barrier discharge to form a uniform plasma between the electrodes and the air, effectively degrading organic matter in wastewater. This design not only improves treatment efficiency but also reduces wear on mechanical components, extending the service life of the equipment.

[0024] In the specific implementation process, as a preferred setting, a mechanical stirring mechanism 14 is provided in the above-mentioned oil separator 2, which can further improve the oil-water separation efficiency in the tight gas fracturing flowback fluid and improve the subsequent purification treatment efficiency.

[0025] This device can operate independently or in series with other process units. When used as a single treatment unit, first add an appropriate amount of chemical reagents to the reaction zone, activate the cyclone aeration mechanism 4 to promote thorough mixing of the reagents and the return liquid; then start the reactor 6 to perform a mild oxidation treatment on the wastewater; after the reaction is completed, let it stand for a period of time to allow solid particles to naturally settle into the sludge hopper 9 at the bottom; finally, select the appropriate location as needed to open the drain valve 8 to discharge the upper clear liquid. The entire process does not require frequent replacement of consumables and maintenance is simple and easy. The specific operation process is as follows: Adding chemical agents: First, add an appropriate amount of chemical agents into the reaction zone. These agents can be coagulants, flocculants or other special chemicals. The specific type and amount depend on the water quality; Start the cyclone aeration mechanism 4: Start the cyclone aeration mechanism 4, and aerate and stir through the cyclone aeration heads 5 at different heights to ensure that the chemical agents are fully mixed with the wastewater and accelerate the chemical reaction process; Start the low-temperature plasma reactor 6: Then start the low-temperature plasma generator to mildly oxidize the wastewater. Low-temperature plasma technology can produce highly active free radicals at a lower temperature, effectively decomposing organic matter without causing secondary pollution; Standing sedimentation: After the reaction is completed, turn off all power equipment and let the wastewater stand for a period of time to allow solid particles to naturally settle into the sludge hopper 9 at the bottom. This process helps to further clarify the water quality; Discharge clear liquid: Finally, select a suitable position as needed to open the valve to discharge the upper clear liquid; at this time, the discharged liquid has undergone multiple processes and the water quality has been significantly improved.

[0026] When this device is used in series with other process units, it can be used as part of the pretreatment or deep treatment process. For example:

[0027] As a pre-treatment unit: In this case, the device is mainly used to remove most of the suspended solids and some organic matter, reducing the burden on subsequent treatment units. After the initial treatment, the wastewater enters other process units for further purification.

[0028] As an advanced treatment unit: If this device is used as an advanced treatment unit, it is primarily used to further remove residual organic matter and inorganic salts, ensuring that the final effluent meets higher water quality standards. In this case, this device is usually located at the end of the entire treatment process, playing a final checkpoint role.

[0029] No matter which mode is adopted, the device can provide efficient and stable treatment effects, and is easy to operate and has low maintenance costs.

[0030] In summary, the tight gas fracturing flowback fluid treatment device designed in this scheme has the advantages of compact structure, convenient operation and low cost, and is very suitable for use in the field of oil and natural gas wastewater treatment; through integrated design, application of advanced technology and flexible drainage mechanism, the device not only solves many problems existing in traditional treatment methods, but also provides an efficient and environmentally friendly solution for the tight gas flowback fluid generated during the tight gas extraction process; in the future, with the continuous advancement and improvement of technology, it is believed that this new treatment device will be widely used in more fields.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Tight gas fracturing flowback fluid processing device, characterized in that: The invention comprises an integrated reaction sedimentation tank, a grease trap is provided on one side of the integrated reaction sedimentation tank, the grease trap and the integrated reaction sedimentation tank are connected through an overflow tank, a dosing pipeline is provided on the top of the integrated reaction sedimentation tank, a cyclone aeration mechanism is provided in the integrated reaction sedimentation tank, and the aeration head of the cyclone aeration mechanism is located inside the integrated reaction sedimentation tank and is arranged in a staggered manner in terms of height; Continuous baffled dielectric barrier low-temperature plasma reactors are symmetrically arranged on both sides of the integrated reaction sedimentation tank, one end of the reactor is connected to the discharge end of the external reflux pump arranged in the integrated reaction sedimentation tank, and the other end extends into the integrated reaction sedimentation tank; The side of the integrated reaction sedimentation tank is provided with a multi-stage drain outlet; A sludge hopper and a sludge discharge pipe are provided at the bottom of the integrated reaction sedimentation tank.

2. The tight gas fracturing flowback fluid processing device according to claim 1, characterized in that: The continuous baffled dielectric barrier low-temperature plasma reactor comprises quartz tubes connected along a fold line, stainless steel electrodes are inserted into the quartz tubes, a metal mesh is sheathed on the outside of the quartz tubes, and a micro aeration system is connected to the bottom of the quartz tubes.

3. The tight gas fracturing flowback fluid processing device according to claim 2, characterized in that: The stainless steel electrode is connected to a high-voltage pulse AC power supply, the metal mesh is connected to a ground electrode, and the distance between the stainless steel electrode and the metal mesh is 5 to 10 mm.

4. The tight gas fracturing flowback fluid processing device according to claim 2, characterized in that: The diameter of the stainless steel electrode is 3 cm.

5. The tight gas fracturing flowback fluid processing device according to claim 2, characterized in that: The metal mesh is a 40-100 mesh stainless steel metal mesh or a metal copper mesh.

6. The tight gas fracturing flowback fluid processing device according to claim 1, characterized in that: A mechanical stirring mechanism is provided in the grease trap.

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