A fracturing flowback fluid residue separation device and method

Abstract

This invention relates to the field of fracturing flowback fluid treatment technology, and in particular to a fracturing flowback fluid residue separation device, comprising a separation box fixed on a support, a box cover on the top of the separation box, and a stirring device provided on the box cover; wherein, a desander box and a chemical dosing port are connected to the box cover, and the fracturing flowback fluid enters the interior of the separation box along the desander box; a filter screen is movably connected to the inside of the separation box. In this invention, by adopting a liftable box cover design, after the fracturing flowback fluid is treated, when the box cover is moved upward and opened, the entire box cover and the stirring device can be moved to a side away from the separation box by means of a transverse mechanism, thus realizing convenient removal of the filter screen for cleaning of contaminants and replacement of the filter screen. This design greatly improves the convenience of operation. Furthermore, this invention also provides a locking claw for fixing the position of the box cover when it is closed.

Description

Technical Field

[0001] This invention relates to the field of fracturing flowback fluid treatment technology, and in particular to a device and method for separating residues from fracturing flowback fluid. Background Technology

[0002] To increase oil production, oilfields need to add fracturing fluid to the formation to improve fracture conductivity and formation permeability. Fracturing flowback fluid is the wastewater from fracturing operations that is returned to the surface. Fracturing flowback fluid contains various chemical components such as thickeners and crosslinking agents. Its complex chemical composition, high viscosity, and high COD and suspended solids content make it a type of oilfield wastewater that is difficult to treat.

[0003] Current separation devices typically involve adding oxidizing agents to the fracturing flowback fluid during wastewater filtration to oxidize the fluid into small, non-viscous molecules, thus facilitating subsequent filtration. However, existing separation devices use a tank-type structure, making it difficult to remove the internal filter screen for cleaning after separation and filtration. Therefore, to further improve the ease of use of existing separation devices, we propose a residue separation device and method for fracturing flowback fluid. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the inconvenience of removing internal filters for cleaning contaminants, and to propose a device and method for separating residues from fracturing flowback fluid.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Design a fracturing flowback fluid residue separation device, including a separation box fixed on a support, a box cover on the top of the separation box, and a stirring device provided on the box cover;

[0007] The cover of the tank is connected to a desander box and a chemical dosing port, and the fracturing flowback fluid enters the interior of the separation box along the desander box;

[0008] A filter screen is movably connected to the inside of the separation box. A drive device is provided on the support to drive the box cover to move up and down. A transverse mechanism is also provided between the drive device and the support to move the lifted box cover left and right.

[0009] Furthermore, the stirring device includes a motor fixed to the box cover, a stirring rod fixed to the shaft end of the motor, and a plurality of stirring blades fixed to the outer periphery of the stirring rod.

[0010] Furthermore, there are two drive devices, each fixed to one side of the bracket.

[0011] The driving device includes slides mounted on both sides of the bracket, a mounting plate fixedly mounted between the two slides, a cylinder provided on the front side of the mounting plate, and the shaft end of the cylinder fixedly connected to the box cover.

[0012] Furthermore, a straight groove is provided on the end face of the slide, and a fastener connected to the bracket is provided in the straight groove. A spring is also fixedly connected between the slide and the bracket.

[0013] Furthermore, a jack is rotatably connected to the top of the bracket, and an abutment rod is fixedly installed on the side of the slide to abut the jack. The jack is used to engage the lid.

[0014] Furthermore, the lateral movement mechanism includes a guide rail fixed to the mounting plate, and the cylinder is slidably connected to the guide rail via a sliding member.

[0015] Furthermore, a guide groove is provided on the end face of the mounting plate, a positioning post is fixed on the inner side of the cylinder, a positioning block is fixed on the side of the separation box, a V-shaped groove is provided on the positioning block, and the positioning post is engaged inside the V-shaped groove.

[0016] Furthermore, the outer side of the filter screen is provided with an annular protrusion, and a bearing protrusion is fixedly installed on the inner side of the separation box, with the annular protrusion placed on the bearing protrusion.

[0017] Furthermore, a plug rod is fixedly installed on the top of the annular protrusion, and several sleeves are provided on the end face of the bearing protrusion. The plug rod is inserted into the sleeve, and a compression spring is provided on the inner side of the sleeve.

[0018] In addition, the present invention also proposes a method for separating the residue of fracturing flowback fluid, comprising the following steps;

[0019] S1. Add the fracturing flowback fluid to the inlet of the desanding box. After the insoluble impurities are filtered and separated by the desanding box, the liquid enters the separation box.

[0020] S2. Add the chemical additive through the dosing port, and at this time turn on the agitator to mix the chemical additive with the fracturing flowback fluid;

[0021] S3. After the water quality meets the requirements, the treated fracturing flowback fluid is discharged through the drain pipe at the bottom of the separation tank.

[0022] S4. When it is necessary to clean the filter screen, the entire box cover is driven to move upward and separate from the separation box by the drive device and the stirring device. Then, the entire box cover is moved horizontally by the horizontal moving mechanism so that the box cover and the separation box are misaligned. At this time, the filter screen can be taken out from the inside of the separation box for subsequent steps.

[0023] The present invention proposes a device and method for separating fracturing flowback fluid residues, which has the following advantages: By adopting a liftable tank cover design, after the fracturing flowback fluid is treated, when the tank cover is moved upwards and opened, the entire tank cover, along with the stirring device, can be moved to a side away from the separation tank by a lateral movement mechanism. This facilitates the removal of the filter screen for cleaning and replacement of contaminants. This design greatly improves the ease of operation. Furthermore, the present invention includes a locking mechanism for fixing the position of the tank cover when it is closed, ensuring stability during fracturing flowback fluid treatment and effectively improving the practicality of the equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the stirring device structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the carriage structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the separation box structure of the present invention;

[0028] Figure 5 for Figure 4 A magnified structural diagram of area A;

[0029] Figure 6 This is a schematic diagram of the insertion rod structure of the present invention.

[0030] In the diagram: 1. Support; 2. Separation box; 21. Bearing protrusion; 22. Sleeve; 23. Compression spring; 3. Box cover; 4. Stirring device; 41. Motor; 42. Stirring rod; 43. Stirring blade; 5. Sand removal box; 6. Dosing port; 7. Filter screen; 71. Ring protrusion; 72. Insert rod; 8. Drive device; 81. Slide; 82. Mounting plate; 83. Cylinder; 84. Fastener; 85. Spring; 86. Claw; 87. Abutment rod; 9. Lateral movement mechanism; 91. Guide groove; 92. Positioning column; 93. Positioning block; 94. V-groove. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figure 1-6 In one embodiment of the present invention, a fracturing flowback fluid residue separation device is disclosed. The separation device includes a separation box 2 fixed on a support 1, a box cover 3 covering the top of the separation box 2, and a stirring device 4 provided on the box cover 3.

[0033] The cover 3 is connected to a desander box 5 and a chemical dosing port 6. The fracturing flowback fluid enters the interior of the separation box 2 along the desander box 5. The desander box 5 includes a box body and a cover plate bolted to the top of the box body. Of course, a filter screen is also built into the box body to filter insoluble impurities in the fracturing flowback fluid. Its specific structure has been disclosed in the prior art and will not be described in detail here. In addition, those skilled in the art know that in this embodiment, a drain pipe is also provided at the bottom of the separation box 2 for discharging the treated fracturing flowback fluid outward.

[0034] A filter screen 7 is movably connected to the inside of the separation box 2. A drive device 8 is provided on the support 1 to drive the box cover 3 to move up and down. A transverse mechanism 9 is also provided between the drive device 8 and the support 1 to move the lifted box cover 3 left and right.

[0035] In some embodiments, the stirring device 4 of the present invention includes a motor 41 fixed on the box cover 3, a stirring rod 42 fixed on the shaft end of the motor 41, and a plurality of stirring blades 43 fixed on the outer periphery of the stirring rod 42. The stirring rod 42 is driven to rotate by the motor 41, so as to drive the stirring blades 43 to stir the fracturing flowback fluid and the chemical solution inside the separation box 2, so as to improve the processing efficiency of the fracturing flowback fluid.

[0036] Furthermore, in this embodiment, there are two driving devices 8, which are respectively fixed on both sides of the bracket 1;

[0037] The driving device 8 includes slides 81 mounted on both sides of the bracket 1. An mounting plate 82 is fixedly installed between the two slides 81. A cylinder 83 is provided on the front side of the mounting plate 82. The shaft end of the cylinder 83 is fixedly connected to the box cover 3. That is, in this embodiment, the telescopic movement of the cylinder 83 is used to control the up and down movement of the box cover 3. When it is necessary to replace or clean the internal filter screen 7, the shaft end of the cylinder 83 extends to push the entire box cover 3 and the stirring device 4 together to the top of the separation box 2. After that, the position of the box cover 3 can be adjusted by the transverse mechanism 9 so that the filter screen 7 is in a completely exposed state. In this state, the removal and installation of the filter screen 7 are not interfered with, improving the convenience of operation.

[0038] Based on the above embodiments, in this embodiment, a straight groove is provided on the end face of the slide 81, and a fastener 84 connected to the bracket 1 is provided in the straight groove. A spring 85 is also fixedly connected between the slide 81 and the bracket 1. Preferably, the fastener 84 in this embodiment is a bolt, which slides in the straight groove to guide the sliding direction of the slide 81. That is, the slide 81 and the bracket 1 are slidably connected in this embodiment. The specific functions will be described in detail later and will not be elaborated here.

[0039] Furthermore, in this embodiment, a claw 86 is rotatably connected to the top of the bracket 1, and an abutment rod 87 for abutting the claw 86 is fixedly installed on the side of the slide 81. The claw 86 is used to engage the box cover 3.

[0040] In summary, in this embodiment, the slide 81 is designed to be slidably connected to the bracket 1. In the initial state, the claw 86 is engaged with the outside of the box cover 3, and at the same time, the cylinder 83 retracts, and the box cover 3 covers the top of the separation box 2.

[0041] When the box cover 3 is lifted upwards, under the gravity of the box cover 3 and the stirring device 4, the shaft end of the cylinder 83 will extend and drive the mounting plate 82 to move downwards a certain distance. At this time, the contact rod 87 separates from the claw 86, and the claw 86 rotates and separates from the box cover 3 under the action of gravity. Of course, those skilled in the art know that a spring can also be set between the claw 86 and the bracket 1 for the rotation reset of the claw 86, so as to achieve rapid separation from the box cover 3 when no force is applied. Furthermore, when the mounting plate 2 compresses the spring 85 to move to the maximum distance, when the cylinder 83 extends further, it can push the box cover 3 to move upwards, realizing the separation operation of the box cover 3 and the separation box 2.

[0042] When the cover needs to be closed, the shaft end of cylinder 83 extends and retracts until the cover 3 is closed on the top of the separation box 2. When the cover 3 contacts the top of the separation box 2, cylinder 83 will move further. During this process, due to the blocking force between the cover 3 and the separation box 2, cylinder 83 will drive the mounting plate 82 to move upward a small distance. At this time, the abutment rod 87 on the mounting plate 82 abuts against the claw 86 and flips, so that the claw 86 is locked on the top of the cover 3 to play a locking and safety role, so as to lock and fix the cover 3 and improve the stability of the connection.

[0043] In some embodiments, the transverse mechanism 9 of the present invention includes a guide rail fixed on the mounting plate 82, and the cylinder 83 is slidably connected to the guide rail via a sliding member. Preferably, the sliding member in this embodiment is a slider, which is fixedly connected to the cylinder 83 and slidably connected to the guide rail.

[0044] Based on the above embodiments, in this embodiment, a guide groove 91 is provided on the end face of the mounting plate 82. The guide groove 91 is a horizontal groove and is provided along the sliding direction of the cylinder 83. A positioning post 92 is fixed on the inner side of the cylinder 83. A positioning block 93 is fixed on the side of the separation box 2. A V-shaped groove 94 is provided on the positioning block 93. The positioning post 92 is engaged inside the V-shaped groove 94.

[0045] Specifically, in this embodiment, since the cylinder 83 adopts a sliding structure design, a positioning post 92 is fixed on the back end of the cylinder 83. Through its cooperation with the guide groove 91, when the box cover 3 is pushed up, that is, when the cylinder 83 and the mounting plate 82 are moved backward, it will not interfere with the lateral movement of the cylinder 83, so as to ensure the stability of the lateral movement of the box cover 3.

[0046] When a reset is required, the position of cylinder 83 must first be reset, that is, the cover 3 is moved above the separation box 2. When cylinder 83 retracts, cylinder 83 and mounting plate 82 will move upward. During this process, the positioning pin 92 on cylinder 83 will engage with the V-groove 94 of positioning block 93. This ensures that after cylinder 83 retracts, its lateral position is fixed by positioning pin 92 in conjunction with V-groove 94, thereby improving the accuracy of the connection.

[0047] In some embodiments, the filter screen 7 of the present invention is provided with an annular protrusion 71 on the outer side, and a bearing protrusion 21 is fixedly installed on the inner side of the separation box 2. The annular protrusion 71 is placed on the bearing protrusion 21, that is, the filter screen 7 of the present invention is movably placed to facilitate subsequent removal, replacement and maintenance.

[0048] Based on the above embodiments, in this embodiment, a plug rod 72 is fixedly installed on the top of the annular protrusion 71, and a plurality of sleeves 22 are provided on the end face of the bearing protrusion 21. The plug rod 72 is inserted into the sleeve 22. A compression spring 23 is provided on the inner side of the sleeve 22. That is, in this embodiment, the cooperation between the plug rod 72 and the sleeve 22 can achieve two purposes: first, the circumferential position of the filter screen 7 can be positioned and locked; second, when the cover is closed, the box cover 3 presses the filter screen 7 downward. Specifically, the bottom of the box cover 3 abuts against the annular protrusion 71 and moves downward. When separated, the filter screen 7 moves upward under the drive of the compression spring 23, so as to facilitate the easy removal of the filter screen 7.

[0049] Furthermore, this invention also proposes a method for separating the residue of fracturing flowback fluid. Specifically, the method includes the following steps;

[0050] S1. Add the fracturing flowback fluid to the inlet of the desanding box 5. After the insoluble impurities are filtered and separated by the desanding box 5, the liquid enters the separation box 2.

[0051] S2. Add the drug additive through the dosing port 6. At this time, turn on the stirring device 4 to mix the drug additive with the fracturing flowback fluid.

[0052] S3. After the water quality meets the requirements, the treated fracturing flowback fluid is discharged through the drain pipe at the bottom of the separation tank 2.

[0053] S4. When it is necessary to clean the filter screen 7, the entire box cover 3 is driven by the drive device 8 to move upward and separate from the separation box 2 along with the stirring device 4. Then, the entire box cover 3 is moved horizontally by the horizontal moving mechanism 9 so that the box cover 3 and the separation box 2 are misaligned. At this time, the filter screen 7 can be taken out from the inside of the separation box 2 for subsequent steps.

[0054] In summary, by adopting a liftable tank cover 3 design, after the fracturing flowback fluid is treated, when the tank cover 3 is moved upward and opened, the entire tank cover 3, together with the stirring device 4, can be moved to a side away from the separation tank 2 by means of the transverse mechanism 9. This allows for convenient removal of the filter screen 7 for cleaning of contaminants and replacement of the filter screen 7. This design greatly improves the convenience of operation. Furthermore, the present invention also includes a locking claw 86 for fixing the position of the tank cover 3 when it is closed, ensuring the stability during the treatment of fracturing flowback fluid and effectively improving the practicality of the equipment.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for separating the residue of fracturing flowback fluid, comprising a separation box (2) fixed on a support (1), characterized in that: A lid (3) is placed on top of the separation box (2), and a stirring device (4) is provided on the lid (3). The cover (3) is connected to a desanding box (5) and a chemical dosing port (6), and the fracturing flowback fluid enters the interior of the separation box (2) along the desanding box (5); A filter screen (7) is movably connected to the inside of the separation box (2). A drive device (8) is provided on the support (1) to drive the box cover (3) to move up and down. A transverse mechanism (9) is also provided between the drive device (8) and the support (1) to move the lifted box cover (3) left and right through the transverse mechanism (9). Two drive devices (8) are provided and fixed to both sides of the bracket (1); The drive device (8) includes a slide (81) installed on both sides of the bracket (1), and a mounting plate (82) is fixedly installed between the two slides (81). A cylinder (83) is provided on the front side of the mounting plate (82). The shaft end of the cylinder (83) is fixedly connected to the box cover (3). A straight groove is provided on the end face of the slide (81). A fastener (84) connected to the bracket (1) is provided in the straight groove. A spring (85) is also fixedly connected between the slide (81) and the bracket (1). A claw (86) is rotatably connected to the top of the bracket (1). An abutment rod (87) for abutting the claw (86) is fixedly installed on the side of the slide (81). The claw (86) is used to engage the box cover (3).

2. The fracturing flowback fluid residue separation device according to claim 1, characterized in that: The stirring device (4) includes a motor (41) fixed on the box cover (3), a stirring rod (42) fixed on the shaft end of the motor (41), and a plurality of stirring blades (43) fixed on the outer periphery of the stirring rod (42).

3. The fracturing flowback fluid residue separation device according to claim 1, characterized in that: The lateral movement mechanism (9) includes a guide rail fixed on the mounting plate (82), and the cylinder (83) is slidably connected to the guide rail via a sliding member.

4. The fracturing flowback fluid residue separation device according to claim 3, characterized in that: The mounting plate (82) has a guide groove (91) on its end face, a positioning post (92) is fixed on the inner side of the cylinder (83), a positioning block (93) is fixed on the side of the separation box (2), a V-shaped groove (94) is provided on the positioning block (93), and the positioning post (92) is engaged in the inside of the V-shaped groove (94).

5. The fracturing flowback fluid residue separation device according to claim 1, characterized in that: The filter screen (7) has an annular protrusion (71) on its outer side, and a bearing protrusion (21) is fixedly installed on the inner side of the separation box (2). The annular protrusion (71) is placed on the bearing protrusion (21).

6. The fracturing flowback fluid residue separation device according to claim 5, characterized in that: A plug rod (72) is fixedly installed on the top of the annular protrusion (71), and a plurality of sleeves (22) are provided on the end face of the bearing protrusion (21). The plug rod (72) is inserted into the sleeve (22), and a compression spring (23) is provided on the inner side of the sleeve (22).

7. A method for separating the residue from fracturing flowback fluid, characterized in that, Includes the following steps; S1. Add the fracturing flowback fluid to the inlet of the desanding box (5). After the insoluble impurities are filtered and separated by the desanding box (5), the liquid enters the separation box (2). S2. Add drug additives through the dosing port (6), and at this time turn on the stirring device (4) to achieve mixing of drug additives and fracturing flowback fluid; S3. After the water quality meets the requirements, the treated fracturing backflow fluid is discharged through the drain pipe at the bottom of the separation tank (2); S4. When it is necessary to clean the filter screen (7), the entire box cover (3) is driven by the drive device (8) and the stirring device (4) is moved upward and separated from the separation box (2). Then, the entire box cover (3) is moved horizontally by the horizontal moving mechanism (9) so that the box cover (3) and the separation box (2) are misaligned. At this time, the filter screen (7) can be taken out from the inside of the separation box (2) for subsequent steps.

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