Petroleum and natural gas drilling sewage treatment device

Abstract

The utility model provides a petroleum and natural gas well drilling sewage treatment device which comprises a filter barrel provided with a water inlet and a water outlet, a filter screen which is horizontally arranged and used for intercepting solid particles is arranged in the filter barrel, the water inlet and the water outlet are located above and below the filter screen respectively, and a material stirring mechanism is arranged above the filter screen; the material stirring mechanism comprises a waste collecting tank, a material stirring brush and a driving assembly, a tank opening of the waste collecting tank is located below the filter screen or connected with the filter screen, the material stirring brush is located above the filter screen, and the driving assembly is used for driving the material stirring brush to reciprocate in a rectangular annular track. Solid particles on the filter screen are fed into the waste collecting tank by the material stirring brush. On the basis of an existing filtering device, the material stirring mechanism is arranged above the filtering net, accumulation of solid particles on the filtering net can be avoided through the movably arranged material stirring brush, it is ensured that the filtering net has enough filtering area, the filtering effect is ensured, and the cleaning period of the filtering net is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of drilling wastewater treatment technology, and in particular to an oil and gas drilling wastewater treatment device. Background Technology

[0002] Oil and gas drilling wastewater is wastewater generated during oil and gas drilling. This type of wastewater has a complex composition, containing petroleum substances, drilling mud additives, rock cuttings, and various heavy metal ions. The wastewater contains a large amount of organic matter, such as organic polymers from drilling fluids and petroleum substances, resulting in a high COD value. Therefore, this type of wastewater needs to be treated before discharge.

[0003] The treatment process for this type of wastewater mainly includes pretreatment, secondary treatment, and advanced treatment. The secondary treatment process includes sedimentation and filtration steps, with a filtration device used to filter the wastewater. Existing filtration devices are simple cylindrical structures with a filter screen; wastewater passes through the screen for filtration, while solid waste is intercepted by the screen.

[0004] Because filter devices need to be cleaned after a certain period of use, and existing filter devices have a simple structure that cannot move solid waste on the filter screen, the filtration effect is affected, resulting in a high frequency of cleaning of the filter devices and a reduction in the treatment effect of sewage. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of this utility model is to provide an oil and gas drilling wastewater treatment device to solve the problem of low drilling wastewater treatment efficiency in the prior art.

[0006] To achieve the above-mentioned objectives of this utility model, this utility model provides an oil and gas drilling wastewater treatment device, including a filter barrel with an inlet and an outlet, a horizontally arranged filter screen for intercepting solid particles inside the filter barrel, the inlet and outlet being located above and below the filter screen respectively, and a material feeding mechanism being provided above the filter screen.

[0007] The material feeding mechanism includes a waste collection trough, a feeding brush, and a drive assembly. The opening of the waste collection trough is located below or connected to the filter screen. The feeding brush is located above the filter screen. The drive assembly is used to drive the feeding brush to move back and forth in a rectangular circular trajectory so that the feeding brush can feed the solid particles on the filter screen into the waste collection trough.

[0008] Furthermore, the number of driving components is at least one.

[0009] The drive assembly includes two sprockets, a roller chain fitted on the two sprockets, a drive component for driving the rotation of any sprocket, and a moving component;

[0010] Two sprockets are spaced apart inside the filter barrel and are rotatably connected to the inner wall of the filter barrel via a connecting shaft.

[0011] The moving part includes a moving base and a slider. The moving base is fixed to the feeding brush, and the slider slides up and down on the moving base. The slider is hinged to the roller chain.

[0012] Furthermore, the movable base is provided with a vertically arranged slide groove, and the slider is embedded in the slide groove and slidably connected to the slide groove.

[0013] Furthermore, the driving component includes a drive motor, which is fixed outside the filter barrel and coaxially fixed with any connecting shaft.

[0014] Furthermore, the filter screen has a rectangular mesh structure and is installed inside the filter barrel. There is a material leakage gap between any side wall of the filter screen and the filter barrel. The opening of the waste collection trough is located below the material leakage gap or connected to the material leakage gap.

[0015] Furthermore, the waste collection trough is fixed to the inner wall of the filter barrel, and the bottom of the waste collection trough is inclined along its length. A discharge pipe is provided at the lower end of the inclined bottom of the waste collection trough, and a switch valve is provided on the discharge pipe.

[0016] Furthermore, an inlet pipe is installed on the inclined bottom of the waste collection tank, and a control valve is installed on the inlet pipe.

[0017] Furthermore, the filter barrel is equipped with multiple mounting rods arranged side by side, and the filter screen is mounted on each mounting rod.

[0018] Furthermore, the filter screen and filter canister are detachably connected;

[0019] The filter barrel has an insertion port on its side wall. The filter screen enters the filter barrel through the insertion port and is mounted on each mounting rod.

[0020] Furthermore, the filter screen is connected to at least one limiting rod, which is at least partially located outside the filter barrel.

[0021] The beneficial effects of this utility model are:

[0022] Based on existing filtration devices, this application adds a material feeding mechanism above the filter screen. By moving the feeding brush, the accumulation of solid particles on the filter screen can be avoided, ensuring that the filter screen has sufficient filtration area, ensuring filtration effect, and extending the filter screen cleaning cycle.

[0023] Meanwhile, the feeding mechanism also includes a waste collection tank, which can be used to collect solid particles intercepted on the filter screen for centralized processing, avoiding excessive accumulation of solid particles on the filter screen, affecting the effective filtration area of ​​the filter screen, and further extending the cleaning cycle of the filter screen.

[0024] Furthermore, given the installation location of the waste collection trough, the material-dispensing brush needs to contact the filter screen when moving towards the waste collection trough, and needs to be spaced apart from the filter screen when moving away from the waste collection trough. Therefore, the material-dispensing brush of this application moves back and forth in a rectangular circular trajectory to ensure that the solid particles intercepted on the filter screen are guided into the waste collection trough for centralized treatment as much as possible.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure in another state;

[0029] Figure 3 This is a schematic diagram of the installation structure of the waste collection tank and filter bucket of this utility model;

[0030] Figure 4 This is a schematic diagram of the installation structure of the two moving parts and the feeding brush of this utility model;

[0031] Figure 5 This is a schematic diagram of the assembly structure of the drive component, sprocket, and filter barrel of this utility model.

[0032] In the diagram: filter barrel 100, mounting rod 110, inlet 120, outlet 130, waste collection tank 200, liquid inlet pipe 210, discharge pipe 220, filter screen 300, limit rod 310, sprocket 410, connecting shaft 411, roller chain 420, moving seat 430, slider 431, slide groove 432, dovetail groove 433, material brush 440, drive motor 450, inlet 500. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] like Figure 1 , 2 As shown, this utility model provides an oil and gas drilling wastewater treatment device, including a filter barrel 100 with an inlet 500 and an outlet 130. A horizontally arranged filter screen 300 for intercepting solid particles is provided inside the filter barrel 100. The inlet 500 and outlet 130 are located above and below the filter screen 300, respectively. A material-dispensing mechanism is provided above the filter screen 300. The material-dispensing mechanism includes a waste collection trough 200, a material-dispensing brush 440, and a drive assembly. The opening of the waste collection trough 200 is located below or connected to the filter screen 300. The material-dispensing brush 440 is located above the filter screen 300. The drive assembly drives the material-dispensing brush 440 to reciprocate in a rectangular circular trajectory, so that the material-dispensing brush 440 dispenses solid particles from the filter screen 300 into the waste collection trough 200.

[0036] It is understandable that the filter barrel 100 can be an open structure at the top or a closed structure at the top, and the design can be adjusted according to the usage environment. In this application, the filter barrel 100 is open at the top, the water inlet 500 is the liquid outlet end of the water inlet pipe, and the water inlet pipe is located above the filter barrel 100 and close to the right side wall of the filter barrel 100.

[0037] Since the filter barrel 100 is equipped with a horizontally arranged filter screen 300, and the material-dispensing brush 440 moves back and forth in the horizontal direction, in order to ensure that the solid particles intercepted on the filter screen 300 are moved as much as possible under the action of the material-dispensing brush 440, the filter barrel 100 of this application has a rectangular barrel structure, and the material-dispensing brush 440 can move back and forth horizontally along the length or width direction of the filter barrel 100. Correspondingly, the waste collection tank 200 needs to be set in the direction of movement of the material-dispensing brush 440 to facilitate the collection of solid particles intercepted on the filter screen 300.

[0038] Based on the existing filtration device, this application sets up a material feeding mechanism above the filter screen 300. By moving the material feeding brush 440, the accumulation of solid particles on the filter screen 300 can be avoided, ensuring that the filter screen 300 has sufficient filtration area, ensuring filtration effect, and extending the cleaning cycle of the filter screen 300.

[0039] Meanwhile, the feeding mechanism also includes a waste collection tank 200, which can be used to collect solid particles intercepted on the filter screen 300, making it easier to process them centrally, avoiding excessive accumulation of solid particles on the filter screen 300, which would affect the effective filtration area of ​​the filter screen 300 and further extend the cleaning cycle of the filter screen 300.

[0040] Furthermore, given the installation position of the waste collection tank 200, the material-dispensing brush 440 needs to contact the filter screen 300 when moving towards the waste collection tank 200, and the material-dispensing brush 440 needs to be spaced apart from the filter screen 300 when moving away from the waste collection tank 200. Therefore, the material-dispensing brush 440 of this application moves back and forth in a rectangular circular trajectory to ensure that the solid particles intercepted on the filter screen are guided into the waste collection tank 200 for centralized treatment as much as possible.

[0041] In some embodiments of this application, a drive assembly is provided to enable the material-dispensing brush 440 to move in a circular motion along a set trajectory. Theoretically, one drive assembly can also achieve the circular movement of the material-dispensing brush 440. However, to increase the movement stability of the material-dispensing brush 440, two drive assemblies are provided in this application. The two drive assemblies are respectively disposed between the two long inner walls of the filter barrel 100, and the material-dispensing brush 440 is also disposed between the two long inner walls of the filter barrel 100, moving back and forth along the length of the filter barrel 100 in the horizontal direction. Correspondingly, the waste collection tank 200 is also disposed between the two long inner walls of the filter barrel 100, close to one of the short inner walls of the filter barrel 100, and the water inlet 500 is disposed close to the other short inner wall of the filter barrel 100.

[0042] Theoretically, the inlet 500 is a certain distance from the waste collection tank 200, making it difficult for sewage to enter the waste collection tank 200 and reducing the volume of solid particles that the waste collection tank 200 can hold. However, considering the potential impact of sewage entering the waste collection tank 200, multiple drainage holes can be provided at the bottom of the waste collection tank 200. The diameter of the drainage holes should be smaller than the diameter of the fixed particles. The design of the drainage holes can prevent sewage from accumulating in the waste collection tank 200, thus affecting its use.

[0043] To enable both drive components to drive the feeding brush 440 simultaneously, such as Figure 1 , 2As shown, each drive assembly includes two sprockets 410, a roller chain 420 sleeved on the two sprockets 410, a drive component for driving the rotation of any sprocket 410, and a moving component. The two sprockets 410 are arranged horizontally at intervals on the long inner wall of the filter barrel 100. Each sprocket 410 is provided with a coaxially connected connecting shaft 411, and the connecting shaft 411 and the inner wall of the filter barrel 100 are rotatably connected by bearings. The roller chain 420 is sleeved on the two sprockets 410, so that the rotation of the sprockets 410 can realize the circular movement of the roller chain 420. In order to enable the feeding brush 440 to perform circular movement of a rectangular trajectory, this application also provides a moving component, specifically, as shown in... Figure 1 , 2 As shown in Figure 4, the movable component includes a movable base 430 and a slider 431. The slider 431 slides up and down on the movable base 430 and is hinged to the roller chain 420. The two ends of the material-dispensing brush 440 are fixed to the two movable bases 430 corresponding to the two drive components, respectively. Due to the presence of the movable component, when the slider 431 moves to the lower position (lower in the height direction) with the rotation of the roller chain 420, the material-dispensing brush 440 contacts the filter screen 300 and moves along the filter screen 300, moving the particles intercepted on the filter screen 300 toward the waste collection tank 200. When the slider 431 moves with the roller chain 420 to the position of the sprocket 410 and then moves upward, the slider and the roller chain 420 are hinged. The slider 431 will move upward along the movable seat 430, raising the movable seat 430 to a certain position. The upward movement of the movable seat 430 will cause the material-dispensing brush 440 to move upward and separate from the filter screen 300. Then, the material-dispensing brush 440 will move away from the waste collection tank 200 with the movement of the roller chain 420 until it reaches the other sprocket 410. At position 10, slider 431 will move down again, and moving seat 430 and material brush 440 will move down under the action of gravity. Material brush 440 will come into contact with filter screen 300 again, and move towards waste collection tank 200 with the movement of roller chain 420. This process is repeated to realize the rectangular circular trajectory of material brush 440, ensuring that the solid particles intercepted on filter screen 300 can be collected in waste collection tank 200 as much as possible, and ensuring the filtration area of ​​filter screen 300.

[0044] In some embodiments of this application, to ensure the connection between the movable seat 430 and the slider 431, such as Figure 4 As shown, a vertically arranged slide groove 432 can be provided on the movable base 430. The slide groove 432 is a vertically arranged rectangular through groove structure. Dovetail grooves 433 or rectangular grooves can be opened on the two long side walls of the slide groove 432. The slider 431 is embedded in the slide groove 432, and a sliding block adapted to the dovetail groove 433 or rectangular groove is provided to ensure that the slider 431 slides on the movable base 430.

[0045] In some embodiments of this application, since the two drive components need to rotate at the same frequency, the drive component of this application includes a drive motor 450, such as... Figure 5 As shown, the drive motor 450 is a stepper motor or a servo motor, which facilitates control of the drive motor 450. To prevent damage to the drive motor 450 in humid environments, this application fixes the drive motor 450 outside the filter barrel 100, and the output shaft of the drive motor 450 can be coaxially fixed with any connecting shaft 411. In use, the drive motor 450 operates, driving the corresponding sprocket 410 to rotate, thereby driving the roller chain 420 to move in a circular motion. With the setting of the moving parts, the rectangular circular trajectory of the feeding brush 440 is realized to reciprocate.

[0046] In some embodiments of this application, to facilitate the installation of the waste collection trough 200 and the use of the material feeding brush 440, such as... Figure 1 , 2 As shown, the filter screen 300 of this application has a rectangular mesh structure and is mounted inside the filter barrel 100 in a structure adapted to the length direction of the filter barrel 100. A material leakage notch is provided between the short side wall on the left side of the filter screen 300 and the short inner wall on the left side of the filter barrel 100. The opening of the waste collection trough 200 is located below or connected to the material leakage notch. The length direction of the waste collection trough 200 extends along the width direction of the filter barrel 100. This arrangement is convenient and facilitates the collection of solid particles by the waste collection trough 200.

[0047] In some embodiments of this application, theoretically, the waste collection tank 200 can calculate the extended cleaning cycle of the filter screen 300 based on its volume. However, in order to ensure that solid particles in the waste collection tank 200 can be guided while the filter screen 300 is working, such as... Figure 3 As shown, the waste collection tank 200 of this application is fixed to the inner wall of the filter bucket 100, and the bottom of the waste collection tank 200 is inclined along its length. A discharge pipe 220 is provided at the lower inclined end of the bottom of the waste collection tank 200, and a switch valve is provided on the discharge pipe 220. In use, when the switch valve of the discharge pipe 220 is opened, the solid particles collected in the waste collection tank 200 will be guided along the waste collection tank 200 and finally discharged from the filter bucket 100 through the discharge pipe 220. To reduce friction inside the waste collection tank 200, a hydrophobic coating can be provided inside the waste collection tank 200, such as polytetrafluoroethylene, polydimethylsiloxane, polymethylsiloxane oligomer coating, polyurethane acrylic coating, etc.

[0048] In some embodiments of this application, to further enhance the flow-guiding effect of waste in the waste collection tank 200, such as... Figure 1 , 2As shown in Figure 3, this application provides a liquid inlet pipe 210 on the inclined bottom of the waste collection tank 200, and a control valve is provided on the liquid inlet pipe 210. The liquid inlet pipe 210 can be connected to the wastewater to be filtered or to the filtered wastewater. The setting of the liquid inlet pipe can facilitate the introduction of some liquid into the waste collection tank 200, so that the solid particles in the waste collection tank 200 can be guided along its bottom and thus discharged out of the filter bucket 100. Of course, considering the water content requirements of the solid particles, the liquid flow rate of the liquid inlet pipe 210 can be adjusted, or the control valve of the liquid inlet pipe 210 can be opened intermittently.

[0049] In some embodiments of this application, to facilitate the installation of the filter screen 300, the filter barrel 100 is provided with a plurality of mounting rods 110 arranged side by side, and the filter screen 300 is mounted on each mounting rod 110.

[0050] In some embodiments of this application, theoretically, solid particles in the waste collection tank 200 can be continuously discharged into the filter barrel 100, thus the device of this application can operate for extended periods without downtime. However, considering device maintenance, periodic maintenance is also required. Device maintenance mainly involves replacing or cleaning the filter screen 300. To facilitate the maintenance of the filter screen 300, this application detachably connects the filter screen 300 to the filter barrel 100, such as... Figure 1 , 2 As shown in Figure 3, an insertion port 120 is provided on the short left side wall of the filter barrel 100. The insertion port 120 has a strip-shaped structure and extends along the width direction of the filter barrel 100. Both ends of the insertion port 120 are embedded in the two long side walls of the filter barrel 100. The width of the filter screen 300 is adapted to the length of the insertion port 120. After the filter screen 300 enters the filter barrel 100 through the insertion port 120, the filter screen 300 can contact the inner wall of the filter barrel 100 as much as possible, avoiding the problem of sewage passing through the gap between the filter screen 300 and the filter barrel 100, which would affect the filtration effect. At the same time, the filter screen 300 inserted in the filter barrel 100 will be supported on each mounting rod 110 to ensure that the filter screen 300 has sufficient support and facilitates the interception of solid particles in the sewage.

[0051] In some embodiments of this application, since the inlet 120 is located close to the waste collection trough 200, there will be a leakage gap between the filter screen 300 and the inlet 120. Therefore, to facilitate the smooth entry and removal of the filter screen 300 into the filter barrel 100, this application connects at least one limiting rod 310 to the filter screen 300, and the limiting rod 310 is at least partially located outside the filter barrel 100. Figure 1 , 2As shown, this application provides two limiting rods 310. The limiting rods 310 are used to assist the filter screen 300 in being placed in a preset position. In use, to facilitate further fixation of the filter screen 300, the limiting rods 310 and the outer wall of the filter barrel 100 can be fixed by bolts or other detachable fixing methods after the filter screen 300 is installed in place.

[0052] It is worth noting that the length of the feed lever 440 is less than the width of the filter screen 300. Some solid particles exist between the filter screen 300 and the inner wall of the filter barrel 100, but this does not affect the overall filtration area of ​​the filter screen 300. Furthermore, when the filter screen 300 and the filter barrel 100 separate, the solid particles accumulated on the filter screen 300 can be intercepted through the inlet 120 and fall into the waste collection trough 200. Alternatively, if the width of the inlet 120 is set large enough, some of the particles accumulated on the filter screen 300 can be discharged into the filter barrel 100 along with the filter screen 300.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An oil and gas drilling wastewater treatment device, comprising a filter barrel (100) provided with a water inlet (500) and a water outlet (130), a filter screen (300) horizontally arranged in the filter barrel (100) and used for intercepting solid particles, and the water inlet (500) and the water outlet (130) are respectively located above and below the filter screen (300), characterized in that: A stirring mechanism is arranged above the filter screen (300); The stirring mechanism comprises a waste collecting groove (200), a stirring brush (440) and a driving assembly. The slot of the waste collecting groove (200) is arranged below or connected with the filter screen (300). The stirring brush (440) is arranged above the filter screen (300). The driving assembly is used to drive the stirring brush (440) to move back and forth in a rectangular ring track, so that the stirring brush (440) can make the solid particles on the filter screen (300) enter the waste collecting groove (200).

2. The oil and gas drilling wastewater treatment apparatus of claim 1, wherein: The number of the driving assembly is at least one, The driving assembly comprises two chain wheels (410), a roller chain (420) sleeved on the two chain wheels (410), a driving member for driving any chain wheel (410) to rotate and a moving member. The two chain wheels (410) are arranged in the filter barrel (100) at intervals and are rotatably connected with the inner wall of the filter barrel (100) through connecting shafts (411). The moving member comprises a moving seat (430) and a sliding block (431). The moving seat (430) is fixed with the stirring brush (440). The sliding block (431) is arranged on the moving seat (430) to slide up and down and is hinged with the roller chain (420).

3. The oil and gas drilling wastewater treatment apparatus of claim 2, wherein: The moving seat (430) is provided with a vertically arranged sliding groove (432). The sliding block (431) is embedded in the sliding groove (432) and is in sliding connection with the sliding groove (432).

4. The oil and gas drilling wastewater treatment apparatus of claim 2, wherein: The driving member comprises a driving motor (450). The driving motor (450) is fixed outside the filter barrel (100). The driving motor (450) is coaxially fixed with any connecting shaft (411).

5. The oil and gas drilling wastewater treatment device according to any one of claims 1-4, characterized in that: The filter screen (300) is in a rectangular mesh plate structure and is arranged in the filter barrel (100). A material leakage gap is arranged between any side wall of the filter screen (300) and the filter barrel (100). The slot of the waste collecting groove (200) is arranged below or connected with the material leakage gap.

6. The oil and gas drilling wastewater treatment apparatus of claim 5, wherein: The waste collecting groove (200) is fixed with the inner wall of the filter barrel (100). The inner groove bottom of the waste collecting groove (200) is arranged to be inclined along the length direction. A discharge pipe (220) is arranged at the inclined lower end of the inner groove bottom of the waste collecting groove (200). A switch valve is arranged on the discharge pipe (220).

7. The oil and gas drilling wastewater treatment apparatus of claim 6, wherein: A liquid inlet pipe (210) is arranged at the inclined upper end of the inner groove bottom of the waste collecting groove (200). A control valve is arranged on the liquid inlet pipe (210).

8. The oil and gas drilling wastewater treatment apparatus of claim 5, wherein: A plurality of installation rods (110) are arranged side by side in the filter barrel (100). The filter screen (300) is arranged on each installation rod (110).

9. The oil and gas drilling wastewater treatment apparatus of claim 8, wherein: The filter screen (300) is detachably connected with the filter barrel (100). A socket (120) is arranged on the side wall of the filter barrel (100). The filter screen (300) enters the filter barrel (100) along the socket (120) and is arranged on each installation rod (110).

10. The oil and gas drilling wastewater treatment apparatus of claim 9, wherein: The filter screen (300) is connected with at least one limiting rod (310). The limiting rod (310) is at least partially arranged outside the filter barrel (100).

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