Solid-waste separation device for petroleum drilling waste mud

Abstract

The utility model discloses a petroleum drilling waste mud solid waste separation device which comprises a multi-layer mud vibrating screen device, a three-phase centrifugal machine device and a thermal desorption device, and the multi-layer mud vibrating screen device comprises a screening mechanism and a stirring mechanism. The screening mechanism comprises a slurry inlet pipe, a first slurry vibration screen and a second slurry vibration screen, the first slurry vibration screen and the second slurry vibration screen are arranged below the slurry inlet pipe, a first conveying belt is arranged at the bottom of the screening mechanism, a stirring mechanism is arranged below the screening mechanism, and a water supplementing pipe is arranged at the top of the outer side wall of the front end of the stirring mechanism. A sludge outlet pipe is arranged at the bottom of one side of the stirring mechanism, the other end of the sludge outlet pipe is connected to the three-phase centrifugal machine device, the second conveying belt is connected to the front side of the thermal desorption device, a heat preservation and insulation layer is arranged on the outer side of the thermal desorption device, and a discharging opening is formed in the bottom of the rear side of the thermal desorption device. The solid-liquid separation and landfill device is reasonable in structural design, can quickly and effectively carry out solid-liquid separation and landfill on the drilling mud, and separates out petroleum organic components.

Description

Technical Field

[0001] The utility model relates to the technical field of waste mud solid waste separation, in particular to a waste mud solid waste separation device for oil drilling. Background Technique

[0002] Oil is an indispensable main energy source in today's society and is widely used in production and life. With the increase in energy demand, new requirements are put forward for oil drilling. At present, oil and gas fields across the country basically require the implementation of the process of non-landing treatment of waste mud, and resolutely eliminate and prohibit the past practices of excavating mud pits in drilling sites and mixing lime and cement for solidification. The basic process of non-landing treatment of waste mud is: relying on the multi-stage solid control system of the drilling rig, collecting drilling waste mud and cuttings during drilling on-site, and separating the waste liquid-phase mud. Through the waste mud non-landing treatment equipment, with "physical separation" as the main process, the mud is regenerated and reused on-site for drilling, saving the cost of re-preparing drilling fluid; adding a mud solidifying agent to the separated solid waste such as cuttings to achieve solidification and harmlessness on-site.

[0003] At present, due to insufficient sedimentation separation, the treatment methods of solidification and landfill are not environmentally friendly enough, and it is impossible to realize the on-site reuse of regenerated mud, nor can the oil components contained in the mud be recovered. Oil is a non-renewable resource and needs to be cherished more. Moreover, the unseparated oil buried in the land will cause the land to lose its agricultural value.

[0004] Therefore, it is necessary to design a waste mud solid waste separation device for oil drilling to solve the above problems. Content of the Utility Model

[0005] A waste mud solid waste separation device for oil drilling proposed by the utility model aims to solve the problems of insufficient sedimentation separation and inability to recover the oil components contained in the mud in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An oil drilling waste mud solid waste separation device, comprising a multi-layer mud vibrating screen device, a three-phase centrifuge device and a thermal desorption device. The multi-layer mud vibrating screen device includes an outer cylinder, a screening mechanism and a stirring mechanism. The screening mechanism includes a mud inlet pipe arranged at the top of the outer cylinder, and a first mud vibrating screen mesh and a second mud vibrating screen mesh sequentially arranged below the mud inlet pipe inside the outer cylinder. A reagent spraying pipe is arranged on the inner top of the outer cylinder, and three or more reagent spray heads are evenly distributed on the reagent spraying pipe. A first conveyor belt is arranged on the outer wall of the outer cylinder below the second mud vibrating screen mesh. A stirring mechanism is arranged in the lower half of the outer cylinder. A water replenishing pipe is arranged on the outer side wall of the top of the lower half of the outer cylinder. A rotating shaft is arranged at the middle position of the lower half of the outer cylinder and extends to the bottom inside of the stirring mechanism. A plurality of stirring blades are sleeved on the rotating shaft, and the rotating shaft penetrates through the bottom wall of the outer cylinder and is connected to a rotating motor. A sludge discharge pipe is arranged at the edge position of the bottom wall of the outer cylinder, and the other end of the sludge discharge pipe is connected to the three-phase centrifuge device. The three outlets of the three-phase centrifuge device are respectively connected to an oil tank, a water tank and a second conveyor belt. The second conveyor belt is connected to the front side of the thermal desorption device. The thermal desorption device is divided into a drying area and a thermal desorption area, and a heat insulation layer is arranged outside the thermal desorption device. A first heating pipe and a water vapor exhaust port are installed on the inner wall of the top of the drying area. A second heating pipe and a volatile gas exhaust port are installed on the inner wall of the top of the thermal desorption area. A discharge port is arranged at the bottom of the rear side of the thermal desorption device.

[0008] Preferably, the multi-layer mud vibrating screen device is an integral structure, and the mud flows into the screening mechanism and the liquid drips into the stirring mechanism.

[0009] Preferably, the first mud vibrating screen mesh of the screening mechanism is 60 mesh, and the second mud vibrating screen mesh is 40 mesh. A section of the screen on the side of the first mud vibrating screen mesh and the second mud vibrating screen mesh close to the first conveyor belt is inclined downward.

[0010] Preferably, both the first conveyor belt and the second conveyor belt are provided with edges.

[0011] Preferably, the dried solid mud blocks discharged from the thermal desorption device are transported to a designated position by a conveyor belt.

[0012] The beneficial effects of the present utility model are as follows: When in use, the mud is discharged into the multi-layer mud vibrating screen device for solid-liquid separation first. At the same time, a demulsifier is added to the mud for stirring treatment. The stirred mud is discharged into the three-phase centrifuge for centrifugation treatment to separate water, oil and solids. The separated solids and the solids at the beginning of solid-liquid separation are transported into the thermal desorption device for thermal desorption process. The completed product is pollution-free and can be reused on-site. Description of the Drawings

[0013] Figure 1The structural schematic diagram of a solid waste separation device for waste mud in oil drilling proposed by the present utility model.

[0014] Figure 2 The sectional view of the thermal desorption device proposed by the present utility model.

[0015] In the figure: 1. Multi-layer mud vibrating screen device; 10. First conveyor belt; 11. Mud inlet pipe; 12. Reagent spraying pipe; 13. Reagent spray head; 14. First mud vibrating screen mesh; 15. Second mud vibrating screen mesh; 16. Water replenishing pipe; 17. Stirring bin; 18. Stirring blade; 19. Rotating shaft; 2. Three-phase centrifuge device; 21. Mud discharge pipe; 22. Oil tank; 23. Water tank; 24. Second conveyor belt; 3. Thermal desorption device; 31. Steam exhaust port; 32. First heating pipe; 33. Volatile gas exhaust port; 34. Second heating pipe; 35. Thermal insulation layer; 36. Discharge port. Specific implementation manners

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0017] Refer to Figure 1-2, an oil drilling waste mud solid waste separation device, comprising a multi-layer mud vibrating screen device 1, a three-phase centrifuge device 2 and a thermal desorption device 3. The multi-layer mud vibrating screen device 1 includes an outer cylinder, a screening mechanism and a stirring mechanism. The screening mechanism includes a mud inlet pipe 11 provided at the top of the outer cylinder, and a first mud vibrating screen mesh 14 and a second mud vibrating screen mesh 15 sequentially arranged below the mud inlet pipe 11 inside the outer cylinder. A reagent spraying pipe 12 is provided on the inner top of the outer cylinder, and three or more reagent spray heads 13 are equally spaced on the reagent spraying pipe 12. A first conveyor belt 10 is provided on the outer wall of the outer cylinder below the second mud vibrating screen mesh 15. A stirring mechanism is provided in the lower half of the outer cylinder. A water supply pipe 16 is provided on the outer side wall of the top of the lower half of the outer cylinder. A rotating shaft 19 is provided at the middle position of the lower half of the outer cylinder and the rotating shaft 19 extends into the bottom of the stirring mechanism. A plurality of stirring blades 18 are sleeved on the rotating shaft 19 and the rotating shaft 19 penetrates through the bottom wall of the outer cylinder and is connected to a rotating motor. A sludge discharge pipe 21 is provided at the edge position of the bottom wall of the outer cylinder, and the other end of the sludge discharge pipe 21 is connected to the three-phase centrifuge device 2. The three outlets of the three-phase centrifuge device 2 are respectively connected to an oil tank 22, a water tank 23 and a second conveyor belt 24. The second conveyor belt 24 is connected to the front side of the thermal desorption device 3. The thermal desorption device 3 is divided into a drying area and a thermal desorption area. A heat insulation layer 35 is provided outside the thermal desorption device 3. A first heating pipe 32 and a steam exhaust port 31 are installed on the inner wall of the top of the drying area. A second heating pipe 34 and a volatile gas exhaust port 33 are installed on the inner wall of the top of the thermal desorption area. A discharge port 36 is provided at the bottom of the rear side of the thermal desorption device 3.

[0018] During use, mud is transported into the outer cylinder of the multi-layer mud vibrating screen device 1 through the mud inlet pipe 11 for solid-liquid separation first. Larger particles of solids are screened out through the first mud vibrating screen mesh 14 and the second mud vibrating screen mesh 15. The discharge ports of the first mud vibrating screen mesh 14 and the second mud vibrating screen mesh 15 are above the first conveyor belt 10. Since both the first mud vibrating screen mesh 14 and the second mud vibrating screen mesh 15 are inclined downward by 15 - 20° from one side towards the first conveyor belt 10, and there is a section of the screen mesh near the first conveyor belt 10 inclined downward, this enables the screened solids to slide more smoothly onto the first conveyor belt 10 and be transported to subsequent processing steps. Meanwhile, a reagent spray pipe 12 for spraying demulsifier is provided on the inner wall of the top of the screening mechanism, and the demulsifier flows into the mixing mechanism together with the liquid. In the mixing mechanism, the rotating shaft 19 is driven by a rotating motor to drive the mixing blades 18 to mix, and the mixed liquid is fully mixed. The water supply pipe 16 on the side wall of the mixing mechanism adds water in a timely manner to adjust the concentration and fluidity of the mixed liquid to ensure the mixing effect and the smooth progress of subsequent processing. The mixed liquid after mixing is discharged into the three-phase centrifuge device 2 through the sludge discharge pipe 21 for centrifugation. The three-phase centrifuge device 2 uses the action of centrifugal force to separate the mixed liquid after mixing into water, oil, and solids. Among them, the centrifuged water flows into the water tank 23 through a pipeline for storage for subsequent processing or reuse; the separated oil is transported to the oil tank 22 for collection to achieve the recovery of petroleum organic components; and the remaining solids are transported to the thermal desorption device 3 through the second conveyor belt 24. Both the first conveyor belt 10 and the second conveyor belt 24 are V-shaped conveyor belts with retaining edges, which effectively prevent the sliding of solid substances during transportation and ensure the stability and continuity of material transportation. At the same time, the solid products previously screened out through the first mud vibrating screen mesh 14 and the second mud vibrating screen mesh 15 are also transported into the thermal desorption device 3 together. The thermal desorption device 3 is divided into a drying area and a thermal desorption area, and is provided with a heat insulation layer 35 on the outside. After entering the thermal desorption device 3, the material is first heated and dried in the drying area through the first heating pipe 32, and the temperature of the first heating pipe 32 is controlled at 80 - 100 °C. During this process, the moisture in the material is evaporated, and the water vapor is discharged through the water vapor exhaust port 31. The dried material then enters the thermal desorption area and is heated through the second heating pipe 34 in the thermal desorption area. The temperature of the second heating pipe 34 is 500 - 850 °C, and the volatile substances in the material are separated out under the action of high temperature and discharged through the volatile gas exhaust port 33. The products after thermal desorption treatment are discharged from the discharge port 36 at the bottom of the rear side of the thermal desorption device 3. These products meet the pollution-free standard and can be reused on-site, thus realizing the efficient and environmentally friendly treatment of oil drilling waste mud and effectively solving the problems of insufficient precipitation separation and inability to recover the petroleum components contained in the mud in the prior art.

[0019] Both the first mud vibrating screen 14 and the second mud vibrating screen 15 are inclined downward by 15 - 20° from one side towards the first conveyor belt 10. This facilitates the side-sliding of particulate matter during the vibration process and enables it to enter the first conveyor belt 10.

[0020] The first mud vibrating screen 14 of the screening mechanism is 40 mesh, and the second mud vibrating screen 15 is 60 mesh. A section of the screen near the first conveyor belt 10 of the first mud vibrating screen 14 and the second mud vibrating screen 15 is inclined downward.

[0021] The first mud vibrating screen 14 is 40 mesh and the second mud vibrating screen 15 is 60 mesh. Different mesh numbers mean different screen pore sizes. The 40-mesh screen has a relatively larger pore size, and the 60-mesh screen has a smaller pore size. During the solid-liquid separation process, the mud first passes through the 40-mesh first mud vibrating screen 14, and larger solid particles are initially intercepted. These large particles may be impurities such as larger cuttings. Then, the mud passing through the first screen passes through the 60-mesh second mud vibrating screen 15, which can further screen out smaller solid particles, achieving a more refined classification and screening of solid particles in the mud and improving the solid-liquid separation effect. A section of the screen near the first conveyor belt 10 of the first mud vibrating screen 14 and the second mud vibrating screen 15 is inclined downward. This is mainly to facilitate the smooth sliding of the screened solids onto the first conveyor belt 10. When the vibrating screen is working, the screened solid particles tend to disperse in all directions under the action of vibration. The inclined screen can utilize gravity to make the solid particles slide naturally along the inclined surface and directly fall onto the first conveyor belt 10, avoiding the accumulation of solid particles on the screen and affecting the screening efficiency. At the same time, it also reduces the workload of manual screen cleaning, enabling the screened solids to enter the subsequent conveying link efficiently and automatically, ensuring the continuous and stable operation of the entire separation device.

[0022] The first conveyor belt 10 and the second conveyor belt 24 are V-shaped conveyor belts. This prevents objects from slipping off the conveyor belt.

[0023] The dry solid mud blocks discharged from the thermal desorption device 3 are transported by a conveyor belt for collection and use.

[0024] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A device for separating solid waste from waste mud in oil drilling, characterized by: The invention comprises a multi-layer mud vibrating screen device (1), a three-phase centrifuge device (2) and a thermal desorption device (3), wherein the multi-layer mud vibrating screen device (1) comprises an outer tube, a screening mechanism and a stirring mechanism, wherein the screening mechanism comprises a mud inlet pipe (11) arranged at the top of the outer tube, and a first mud vibrating screen (14) and a second mud vibrating screen (15) arranged in sequence below the mud inlet pipe (11) in the outer tube, a reagent spraying pipe (12) is arranged at the top of the inner tube, and three or more reagent spray heads (13) are evenly spaced on the reagent spraying pipe (12), a first conveyor belt (10) is arranged on the outer wall of the outer tube below the second mud vibrating screen (15), a stirring mechanism is arranged at the lower half of the outer tube, a water supply pipe (16) is arranged on the outer side wall of the top of the lower half of the outer tube, a rotating shaft (19) is arranged at the middle position of the lower half of the inner tube, and the rotating shaft (19) extends to the bottom of the stirring mechanism, and the rotating shaft (19) is arranged at the bottom of the stirring mechanism. A plurality of stirring blades (18) are sleeved on the shaft (19), and the rotating shaft (19) passes through the outside of the bottom wall of the outer cylinder and is connected to the rotating motor. A mud discharge pipe (21) is provided at the edge of the bottom wall of the outer cylinder. The other end of the mud discharge pipe (21) is connected to the three-phase centrifuge device (2). The three outlets of the three-phase centrifuge device (2) are respectively connected to the oil tank (22), the water tank (23) and the second conveyor belt (24). The second conveyor belt (24) is connected to the front side of the thermal desorption device (3). The thermal desorption device (3) is divided into a drying area and a thermal desorption area. A heat insulation layer (35) is provided on the outside of the thermal desorption device (3). A first heating pipe (32) and a water vapor exhaust port (31) are installed on the top inner wall of the drying area. A second heating pipe (34) and a volatile gas exhaust port (33) are installed on the top inner wall of the thermal desorption area. A discharge port (36) is provided at the bottom of the rear side of the thermal desorption device (3).

2. The device for separating solid waste from waste mud in oil drilling according to claim 1, characterized in that: The first mud vibration screen (14) and the second mud vibration screen (15) are both inclined downwardly by 15-20 degrees from one side toward the first conveyor belt (10).

3. The device for separating waste mud from oil drilling according to claim 2, characterized in that: The first mud vibration screen (14) of the screening mechanism has a mesh size of 40, and the second mud vibration screen (15) has a mesh size of 60. The first mud vibration screen (14) and the second mud vibration screen (15) have a section of screen arranged to be tilted downward on one side close to the first conveyor belt (10).

4. The device for separating solid waste from waste mud in oil drilling according to claim 1, characterized in that: The first conveyor belt (10) and the second conveyor belt (24) are V-shaped conveyor belts.

5. The device for separating waste mud from oil drilling according to claim 1, characterized in that: The dry solid mud blocks discharged from the thermal desorption device (3) are transported by a transport belt.

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