A catalytic device and catalytic method for fracturing flowback fluid treatment

Abstract

The application relates to the technical field of catalytic devices, in particular to a fracturing flowback fluid treatment catalytic device and a catalytic method. The device comprises a shell, a liquid inlet pipe, a material adding pipe and a liquid outlet pipe are arranged on the shell, a catalytic cavity is arranged in the shell, a stirring assembly matched with the catalytic cavity is arranged on the shell, a filter screen cylinder is arranged on the liquid inlet pipe, a backflow prevention structure is arranged in the filter screen cylinder, and a cleaning assembly is arranged in the shell. The input flowback fluid is filtered through the filter screen cylinder, the waste residues in the flowback fluid are removed, the catalytic device is prevented from being blocked, the waste residues are prevented from flowing back to an externally-arranged liquid supply device through the backflow prevention structure, the waste residues are collected, the filter screen cylinder can be regularly taken out for cleaning and replacement, when stirring, the rotating shaft drives the cylindrical cam to rotate and drives the cleaning ring to reciprocatingly move up and down to clean the inner wall of the catalytic cavity, the flowback fluid attached to the inner wall is scraped off for catalytic reaction, and the reaction is more sufficient.

Description

Technical Field

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

[0002] Fracturing, as a major reservoir production enhancement measure, has been widely used and rapidly developed. The main types of fracturing fluids include water-based fracturing fluids, oil-based fracturing fluids, emulsion fracturing fluids, and foam fracturing fluids, with water-based fracturing fluids being the most commonly used. The liquid that flows back from the formation to the surface after fracturing operations is called fracturing flowback fluid. It is characterized by high suspended solids content, high mineralization, high COD, high color, high viscosity, and high toxicity. Generally speaking, the pollutant composition of fracturing flowback fluid is relatively stable; it is a complex multiphase dispersion system, and its discharge is intermittent, characterized by dispersion and discontinuity, making centralized treatment difficult. If fracturing flowback fluid is discharged directly without treatment, it will cause significant pollution to the surrounding environment, especially to crops and surface water systems.

[0003] When treating flowback fluid, catalytic devices are usually used to catalyze the fluid, thereby continuously oxidizing it, reducing the organic matter content in the water, and disrupting the stability of colloids. For example, Chinese Patent Publication No. CN206463971 U discloses a "catalytic device for treating fracturing flowback fluid," which uses an intelligent electronic pH detector and corresponding control equipment to intelligently control the pH value in the reaction tank by adding reagents and adding catalysts accordingly, resulting in a higher reaction efficiency. In addition, a Roots blower is installed to ensure that the reaction liquid in the reaction tank is fully stirred, increasing the reaction rate.

[0004] However, in actual use, the backflow liquid contains sludge, suspended solids, sand and other waste residues, which are prone to precipitate during the catalytic process, block the catalytic device, and affect the normal use of the catalytic device. In addition, some backflow liquid will adhere to the inner wall of the catalytic device without contacting the catalyst, thereby reducing the catalytic effect of the catalytic device. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as easy clogging of catalytic devices and poor catalytic effect, and to propose a catalytic device and catalytic method for treating fracturing flowback fluid.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A catalytic device for treating fracturing flowback fluid is designed, comprising a shell, an inlet pipe, a feed pipe, and a drain pipe on the shell, a catalytic chamber inside the shell, a stirring assembly on the shell that cooperates with the catalytic chamber, the inlet pipe and the drain pipe being located on one side of the shell, a slag discharge pipe at the bottom of the shell, and a baffle at the bottom of the catalytic chamber that cooperates with the drain pipe and the slag discharge pipe.

[0008] The inlet pipe is equipped with a filter screen cylinder, the filter screen cylinder is equipped with a check valve structure, the inlet pipe is equipped with a flange, and the outer shell is equipped with a cleaning component.

[0009] Furthermore, the anti-reverse structure includes a connecting sleeve fixedly disposed inside the filter screen cylinder, and a water-blocking component that blocks the flow of liquid is movably inserted into the connecting sleeve. One side of the water-blocking component is connected to the filter screen cylinder by a spring.

[0010] Furthermore, the water-blocking component has a water-guiding cavity inside, and the water-blocking component has multiple through holes on its circumference that communicate with the water-guiding cavity. The inner wall of the connecting sleeve has an annular groove.

[0011] Furthermore, a limiting ring is provided on the side of the water-blocking component near the spring, the outer diameter of the limiting ring being larger than the inner diameter of the water-guiding cavity, and a chamfer is provided on the end of the water-blocking component away from the spring.

[0012] Furthermore, the cleaning assembly includes a cleaning ring slidably disposed within the catalytic chamber, the cleaning ring being in contact with the inner wall of the catalytic chamber, and the cleaning ring being dynamically connected to the stirring assembly.

[0013] Furthermore, the stirring assembly includes a motor mounted on the outer casing, the output shaft of which extends into the catalytic chamber and is fixedly connected to stirring blades via a rotating shaft.

[0014] Furthermore, a cylindrical cam is fixedly mounted on the rotating shaft, and a connecting frame that cooperates with the cylindrical cam is fixedly mounted on the inner wall of the cleaning ring.

[0015] Furthermore, a guide post is fixedly provided on the inner wall of the catalytic chamber, and a guide groove that cooperates with the guide post is provided on the outer wall of the cleaning ring.

[0016] Furthermore, a heating device is provided on the outer wall of the outer casing.

[0017] A catalytic method for treating fracturing flowback fluid using a catalytic device, comprising the aforementioned catalytic device, and further comprising the following steps:

[0018] S1. The return liquid is injected into the catalytic chamber along the inlet pipe, and large particulate impurities are filtered through the filter screen during the injection process.

[0019] S2. Add catalyst into the catalytic chamber through the feeding pipe and mix it using the stirring assembly;

[0020] S3. During stirring, the rotating shaft will drive the cylindrical cam to rotate and drive the cleaning ring to move up and down repeatedly to clean the inner wall of the catalytic chamber, scraping off the backflow liquid attached to the inside for catalytic reaction, so that the reaction is more complete.

[0021] The catalytic device and method for treating fracturing flowback fluid proposed in this invention have the following advantages:

[0022] In this invention, the input return liquid is filtered by setting a filter screen to remove waste residue from the return liquid and avoid clogging the catalytic device. A check valve structure is set to prevent waste residue from flowing back into the external liquid supply device, which plays the role of collecting waste residue. The filter screen can be taken out periodically for cleaning and replacement.

[0023] Secondly, in this invention, during stirring, the rotating shaft drives the cylindrical cam to rotate and drives the cleaning ring to move up and down repeatedly to clean the inner wall of the catalytic chamber, scraping off the backflow liquid attached to the inner wall for catalytic reaction, so that the reaction is more complete. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a catalytic device for treating fracturing flowback fluid proposed in this invention;

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

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

[0027] Figure 4 This is a schematic diagram of the enlarged structure of region A of the present invention.

[0028] In the diagram: 1. Outer shell; 11. Heating device; 2. Inlet pipe; 21. Filter screen cylinder; 22. Flange; 3. Drain pipe; 4. Catalytic chamber; 5. Stirring assembly; 51. Motor; 52. Rotary shaft; 53. Stirring blade; 54. Cylindrical cam; 6. Slag discharge pipe; 7. Baffle; 8. Anti-reverse structure; 81. Connecting sleeve; 82. Water blocking component; 821. Water guiding chamber; 822. Through hole; 823. Annular groove; 824. Limiting ring; 825. Chamfer; 83. Spring; 9. Cleaning assembly; 91. Cleaning ring; 92. Connecting frame; 93. Guide column. Detailed Implementation

[0029] 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.

[0030] Reference Figure 1-4 A catalytic device for treating fracturing flowback fluid includes a housing 1, an inlet pipe 2, a feeding pipe and a drain pipe 3 on the housing 1, a liquid supply device connected to the inlet pipe 2, a catalytic chamber 4 inside the housing 1, a stirring assembly 5 that cooperates with the catalytic chamber 4 on the housing 1, the inlet pipe 2 and the drain pipe 3 are both located on one side of the housing 1, a slag discharge pipe 6 is located at the bottom of the housing 1, and a baffle 7 that cooperates with the drain pipe 3 and the slag discharge pipe 6 is located at the bottom of the catalytic chamber 4.

[0031] The inlet pipe 2 is equipped with a filter screen cylinder 21, and a check valve structure 8 is installed inside the filter screen cylinder 21. The inlet pipe 2 is equipped with a flange 22, and a cleaning component 9 is installed inside the outer casing 1.

[0032] In this invention, the input return liquid is filtered by a filter cylinder 21 to remove waste residue from the return liquid and prevent clogging of the catalytic device. A check valve structure 8 is set to prevent waste residue from flowing back into the external liquid supply device, thus collecting the waste residue. The filter cylinder can be removed periodically for cleaning and replacement. The added catalyst is mixed and stirred by the stirring assembly 5.

[0033] Furthermore, in this embodiment, the anti-reverse structure 8 includes a connecting sleeve 81 fixedly disposed inside the filter cylinder 21. A water-blocking component 82 is movably inserted into the connecting sleeve 81 to block the flow of liquid. One side of the water-blocking component 82 is connected to the filter cylinder 21 via a spring 83. By setting the connecting sleeve 81, the water-blocking component 82, and the spring 83 to cooperate, when liquid is supplied to the catalytic device, the water-blocking component 82 is pushed and misaligned with the connecting sleeve 81. At this time, the spring 83 undergoes elastic deformation, allowing the liquid to enter the catalytic device. When the liquid supply stops, the spring 83 resets, causing the water-blocking component 82 to be inserted into the connecting sleeve 81, thereby preventing the backflow of waste residue caused by the backflow of liquid.

[0034] In this embodiment, a water-blocking component 82 has a water-guiding cavity 821 inside, and a plurality of through holes 822 communicating with the water-guiding cavity 821 are provided on the circumference of the water-blocking component 82. An annular groove 823 is provided on the inner wall of the connecting sleeve 81. When the water-blocking component 82 is pushed, the through holes 822 communicate with the annular groove 823 of the connecting sleeve 81, and the liquid flows through the connecting sleeve 81, the annular groove 823, the through holes 822, and the water-guiding cavity 821 into the catalytic device.

[0035] Furthermore, in this embodiment, a limiting ring 824 is provided on the side of the water blocking component 82 near the spring 83. The outer diameter of the limiting ring 824 is larger than the inner diameter of the water guiding cavity 821. A chamfer 825 is provided on the end of the water blocking component 82 away from the spring 83. By providing the limiting ring 824, the water blocking component 82 is prevented from moving in the opposite direction to stretch the spring 83 and separate from the connecting sleeve 81, causing the waste liquid to carry the waste residue back to flow.

[0036] In this embodiment, the cleaning component 9 includes a cleaning ring 91 that is slidably disposed in the catalytic chamber 4. The cleaning ring 91 is in contact with the inner wall of the catalytic chamber 4 and is poweredly connected to the stirring component 5. The cleaning ring 91 moves up and down repeatedly to clean the inner wall of the catalytic chamber 4 and scrapes off the backflow liquid attached to the inner wall for catalytic reaction.

[0037] It should be noted that, in this embodiment, the stirring assembly 5 includes a motor 51 mounted on the outer casing 1. The output shaft of the motor 51 extends into the catalytic chamber 4 and is fixedly connected to a stirring blade 53 via a rotating shaft 52. The motor 51 drives the rotating shaft 52 and the stirring blade 53 to rotate and mix the return liquid, thereby mixing and stirring the added catalyst evenly.

[0038] In this embodiment, a cylindrical cam 54 is fixedly mounted on the rotating shaft 52, and a connecting frame 92 that cooperates with the cylindrical cam 54 is fixedly mounted on the inner wall of the cleaning ring 91. The cylindrical cam 54 is a reciprocating cylindrical cam, which drives the cleaning ring 91 to move up and down reciprocally under the drive of the motor 51.

[0039] Furthermore, in this embodiment, a guide post 93 is fixedly provided on the inner wall of the catalytic chamber 4, and a guide groove that cooperates with the guide post 93 is provided on the outer wall of the cleaning ring 91. By setting the guide post 93 to cooperate with the guide groove, the cleaning ring 91 is prevented from rotating and not moving up and down.

[0040] In some embodiments, the outer wall of the housing 1 is provided with a heating device 11, which heats the catalytic device to prevent the temperature from being too low and affecting the catalytic efficiency. For example, the heating device 11 may be an electric heating wire.

[0041] The present invention also proposes a catalytic method for the above-mentioned catalytic device, comprising the following steps:

[0042] S1. The return liquid is injected into the catalytic chamber 4 along the inlet pipe 2. During the injection process, large particles of impurities are filtered through the filter screen 21. The water blocking component 82 is pushed and misaligned with the connecting sleeve 81. At this time, the spring 83 undergoes elastic deformation. The through hole 822 is connected to the annular groove 823 of the connecting sleeve 81. The liquid flows through the connecting sleeve 81, the annular groove 823, the through hole 822, and the water guiding chamber 821 into the catalytic device. When the liquid supply is stopped, the spring 83 resets and drives the water blocking component 82 to be inserted into the connecting sleeve 81, thereby preventing the return liquid from carrying the waste residue back.

[0043] S2. Add catalyst into catalytic chamber 4 through feeding pipe and mix it through stirring component 5;

[0044] S3. During stirring, the rotating shaft 52 will drive the cylindrical cam 54 to rotate and drive the cleaning ring 91 to move up and down repeatedly to clean the inner wall of the catalytic chamber 4, scraping off the backflow liquid attached to the inside for catalytic reaction, so that the reaction is more complete.

[0045] 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 catalytic device for treating fracturing flowback fluid, comprising a housing (1), characterized in that, The outer shell (1) is provided with an inlet pipe (2), a feeding pipe and an outlet pipe (3). A catalytic chamber (4) is provided inside the outer shell (1). A stirring assembly (5) that cooperates with the catalytic chamber (4) is provided on the outer shell (1). The inlet pipe (2) and the outlet pipe (3) are both located on one side of the outer shell (1). A slag discharge pipe (6) is provided at the bottom of the outer shell (1). A baffle (7) that cooperates with the outlet pipe (3) and the slag discharge pipe (6) is provided at the bottom of the catalytic chamber (4). The inlet pipe (2) is provided with a filter screen cylinder (21), the filter screen cylinder (21) is provided with a check structure (8), the inlet pipe (2) is provided with a flange (22), and the outer shell (1) is provided with a cleaning component (9). The anti-reverse structure (8) includes a connecting sleeve (81) fixedly installed inside the filter cylinder (21). A water-blocking component (82) that blocks the flow of liquid is movably inserted into the connecting sleeve (81). One side of the water-blocking component (82) is connected to the filter cylinder (21) by a spring (83). The water-blocking component (82) has a water-guiding cavity (821) inside, and the water-blocking component (82) has a plurality of through holes (822) on its circumference that communicate with the water-guiding cavity (821). The inner wall of the connecting sleeve (81) has an annular groove (823). The water-blocking component (82) has a limiting ring (824) on the side near the spring (83). The outer diameter of the limiting ring (824) is larger than the inner diameter of the water-guiding cavity (821). The end of the water-blocking component (82) away from the spring (83) has a chamfer (825).

2. The catalytic device for treating fracturing flowback fluid according to claim 1, characterized in that: The cleaning component (9) includes a cleaning ring (91) that is slidably disposed in the catalytic chamber (4), the cleaning ring (91) being in contact with the inner wall of the catalytic chamber (4), and the cleaning ring (91) being dynamically connected to the stirring component (5).

3. The catalytic device for treating fracturing flowback fluid according to claim 2, characterized in that: The stirring assembly (5) includes a motor (51) mounted on the outer shell (1), the output shaft of which extends into the catalytic chamber (4) and is fixedly connected to a stirring blade (53) via a rotating shaft (52).

4. The catalytic device for treating fracturing flowback fluid according to claim 3, characterized in that: A cylindrical cam (54) is fixedly installed on the rotating shaft (52), and a connecting frame (92) that cooperates with the cylindrical cam (54) is fixedly installed on the inner wall of the cleaning ring (91).

5. The catalytic device for treating fracturing flowback fluid according to claim 4, characterized in that: The inner wall of the catalytic chamber (4) is fixedly provided with a guide post (93), and the outer wall of the cleaning ring (91) is provided with a guide groove that cooperates with the guide post (93).

6. The catalytic device for treating fracturing flowback fluid according to claim 1, characterized in that: A heating device (11) is provided on the outer wall of the outer shell (1).

7. A catalytic method for treating fracturing flowback fluid using a catalytic device, comprising the catalytic device as claimed in claims 1-6, characterized in that, It also includes the following steps: S1. The return liquid is injected into the catalytic chamber (4) along the inlet pipe (2). During the injection process, large particulate impurities are filtered through the filter screen (21). S2. Add catalyst into the catalytic chamber (4) through the feeding pipe and mix it through the stirring assembly (5); S3. During stirring, the rotating shaft (52) will drive the cylindrical cam (54) to rotate and drive the cleaning ring (91) to move up and down to clean the inner wall of the catalytic chamber (4), scrape off the backflow liquid attached to the inside for catalytic reaction, so that the reaction is more complete.

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