Device for collecting floating oil in drilling fluid for offshore drilling

Abstract

The utility model provides a device for collecting floating oil in drilling fluid for offshore drilling, which relates to the technical field of drilling fluid floating oil collection and comprises a collecting barrel, a cover plate is arranged at a barrel opening of the collecting barrel, an oil well pump is fixedly connected to one side of the outer surface of the cover plate, and an oil well pipe penetrates through the center of the outer surface of the cover plate. The oil pumping pipe downwards extends into the collecting barrel through rotation of the multiple anti-skid wheels, and the multiple oil pumping heads at the bottom end of the oil pumping pipe are immersed in a floating oil layer, so that floating oil can enter the oil pumping pipe along the multiple oil pumping heads, and then the floating oil in the collecting barrel is rapidly discharged and collected under the action of the oil pumping pump; therefore, independent operation of the collecting barrel is not affected by the content of floating oil in the drilling fluid, that is, it is guaranteed that the finally additionally discharged and collected drilling fluid is not polluted.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling fluid floating oil collection, in particular to a floating oil collection device for drilling fluid in offshore drilling. Background Technique

[0002] The collection of floating oil in drilling fluid mainly relies on specific devices and technologies. These devices usually include components such as drilling fluid pipelines, centrifuges, sedimentation tanks, connectors, connecting pipelines, diaphragm pumps, oil-water separators, oil collection tanks, and drilling fluid storage tanks.

[0003] For example, in a simple automatic separation device for floating oil in drilling fluid, with the publication number: CN210003225U, when the drilling fluid enters the first circulation tank, the liquid level continuously rises, and a floating oil layer forms on the surface of the drilling fluid. When the liquid level of the drilling fluid reaches the lower liquid inlet, since the simple automatic separation device for floating oil in drilling fluid is in a closed state at this time, the sealing cover plate is at the bottom of the slide rail slot, completely blocking the lower liquid inlet, and the drilling fluid and the floating oil layer cannot enter the main body of the rectangular tank. As long as the liquid level of the drilling fluid does not exceed the upper end face of the first circulation tank, when the liquid level of the drilling fluid continues to rise, exceeds the lower liquid inlet and reaches the position of the float, the floating oil layer will also rise above the lower liquid inlet, and the simple automatic separation device for floating oil in drilling fluid is still in a closed state. At this time, the drilling fluid and the floating oil layer still cannot enter the main body of the rectangular tank. When the liquid level of the drilling fluid and the floating oil layer exceeds the position of the float, the float generates a large buoyancy, which is greater than the weight of the sealing cover plate and the connecting rod. As a result, the sealing cover plate rises along the slide rail slot to open the lower liquid inlet. Since the floating oil layer is already above the lower liquid inlet at this time, only the drilling fluid will enter the main body of the rectangular tank and gradually raise the liquid level until it is flush on both sides and then enters the second circulation tank. If the liquid level of the drilling fluid and the floating oil layer drops, the sealing cover plate will also drop accordingly until it reaches the bottom of the slide rail slot, completely blocking the liquid inlet again, thereby preventing the floating oil layer from entering the main body of the rectangular tank.

[0004] However, the set size of the liquid inlet is fixed, so its maximum flow rate is fixed. And the density of the oil in the drilling fluid is not fixed. Therefore, when there is more floating oil in the drilling fluid injected into the first circulation tank, the thickness of the formed floating oil layer will also increase. Therefore, when the thickness of the floating oil layer is higher than the height between the liquid inlet and the top of the first circulation tank, it will cause the floating oil layer to enter the main body of the rectangular tank and finally enter the second circulation tank, resulting in pollution of the drilling fluid in the second circulation tank. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problems existing in the prior art, and to propose a floating oil collection device for drilling fluid in offshore drilling.

[0006] To achieve the above object, the utility model adopts the following technical scheme: An oil skimming device for drilling fluid in offshore drilling, comprising a collecting barrel, a cover plate is arranged at the barrel opening of the collecting barrel, a submersible pump is fixedly connected to one side of the outer surface of the cover plate, and an oil suction pipe penetrates through the center of the outer surface, the bottom end of the oil suction pipe extends to the inner surface of the collecting barrel and is communicated with a number of oil suction heads distributed in a circular array, the oil suction heads are horizontally arranged in a tubular shape, and the top edge position of the surface of the oil suction head is provided with a strip-shaped hollow, a number of water-oil sensors are embedded in the inner barrel wall of the collecting barrel near the barrel opening, a number of anti-slip wheels are rotatably connected to the outer surface of the cover plate around the oil suction pipe, the surface of the bodies of the anti-slip wheels is in damping fit with the outer wall of the oil suction pipe, and the anti-slip wheels rotate at the same speed.

[0007] Preferably, both ends of the wheel axle of the anti-slip wheel penetrate through the cover plate and extend outwards and are fixedly connected with bevel gears, the adjacent two bevel gears in the adjacent two anti-slip wheels are meshed and connected, and a motor for driving one of the bevel gears to rotate is fixedly connected to the outer surface of the cover plate.

[0008] Preferably, a liquid inlet pump is fixedly connected to one side of the outer barrel wall of the collecting barrel, and a connector is fixedly connected through the bottom of the barrel, and the water outlet of the liquid inlet pump is communicated with the inside of the connector.

[0009] Preferably, a multi-section pipe is rotatably connected to the inner bottom of the collecting barrel, a turbine is rotatably connected to the connector, and a connecting frame fixedly connected to the inner wall of the inner pipe of the multi-section pipe is fixedly connected to the wheel axle of the turbine.

[0010] Preferably, a lifting frame is fixedly connected to the outer wall port of the outer part of the multi-section pipe, the side of the lifting frame is slidably connected to the inner wall of the collecting barrel, and an oil-water separation membrane is laid on the lifting frame.

[0011] Preferably, a number of stirring blades are fixedly connected to the filtering surface of the oil-water separation membrane on the lifting frame and are distributed in a circular array.

[0012] Preferably, one side of the bottom of the collecting barrel is provided with a hollow shape for discharging drilling fluid.

[0013] Compared with the prior art, the advantages and positive effects of the utility model are as follows:

[0014] 1. In the utility model, by setting anti-slip wheels, the oil suction pipe is lowered into the collecting barrel by the rotation of the anti-slip wheels, and a number of oil suction heads at the bottom end of the oil suction pipe are immersed in the floating oil layer, so that the floating oil can enter the oil suction pipe along the oil suction heads, and then the floating oil in the collecting barrel can be quickly discharged and collected under the action of the submersible pump. Therefore, the collecting barrel will not be affected by the floating oil content in the drilling fluid and affect the operation alone, that is, it is ensured that the finally discharged and collected drilling fluid will not be contaminated.

[0015] 2. In the present utility model, by providing a stirring blade and an oil-water separation membrane, drilling fluid accumulates on the oil-water separation membrane, and the rotation of the stirring blade on the filtering surface of the oil-water separation membrane is utilized to form a vortex of the drilling fluid. Under the action of centrifugal force, rapid stratification of oil and water in the drilling fluid is achieved, and the lower water layer can pass through the oil-water separation membrane and fall for separate discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic perspective view of a floating oil collection device for drilling fluid in an offshore drilling rig proposed by the present utility model;

[0017] Figure 2 A floating oil collection device for drilling fluid in an offshore drilling rig proposed by the present utility model Figure 1 is a schematic bottom view;

[0018] Figure 3 A floating oil collection device for drilling fluid in an offshore drilling rig proposed by the present utility model Figure 1 is a schematic sectional view;

[0019] Figure 4 is a schematic bottom view of the cover plate of the present utility model;

[0020] Figure 5 is a schematic sectional view of the connector;

[0021] Figure 6 is Figure 1 an enlarged view of part A in

[0022] Legend: 1. Collection barrel; 2. Cover plate; 3. Oil extraction pipe; 4. Oil extraction pump; 5. Liquid inlet pump; 6. Connector; 7. Anti-slip wheel; 8. Bevel gear; 9. Motor; 10. Multi-section pipe; 11. Oil-water separation membrane; 12. Lifting frame; 13. Water-oil sensor; 14. Oil extraction head; 15. Turbine; 16. Connecting frame; 17. Stirring blade. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to more clearly understand the above-mentioned objects, features, and advantages of the present utility model, the following further describes the present utility model with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0024] In the following description, many specific details are set forth to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0025] Such as Figures 1-6As shown in the figure, an oil skimming device for drilling fluid in offshore drilling includes a collection barrel 1. A cover plate 2 is provided at the opening of the collection barrel 1. On one side of the outer surface of the cover plate 2, an oil pump 4 is fixedly connected, and an oil suction pipe 3 is penetrated through the center of the outer surface. The bottom end of the oil suction pipe 3 extends into the inner surface of the collection barrel 1 and is communicated with a number of oil suction heads 14 distributed in an annular array. The oil suction heads 14 are horizontally arranged tubular structures, and the top edge of the surface of the oil suction heads 14 is provided with strip-shaped hollow openings. During use, after the oil and water in the drilling fluid entering the collection barrel 1 are stratified, the oil suction pipe 3 is lowered to submerge a number of oil suction heads 14 in the floating oil layer. And the floating oil enters the oil suction pipe 3 through the strip-shaped hollow openings on the oil suction heads 14. Under the action of the oil pump 4, the floating oil is removed in time. A number of water-oil sensors 13 are embedded near the opening position of the inner barrel wall of the collection barrel 1. The set water-oil sensors 13 are used to facilitate the real-time detection of the depth of the floating oil layer in the collection barrel 1, and then facilitate the adjustment of the lowering depth of the oil suction pipe 3. A number of anti-slip wheels 7 are rotatably connected to the outer surface of the cover plate 2 around the oil suction pipe 3. The surfaces of the wheels of the number of anti-slip wheels 7 are in damping cooperation with the outer wall of the oil suction pipe 3, and the number of anti-slip wheels 7 rotate at the same speed. Both ends of the wheel shaft of the anti-slip wheel 7 penetrate through the cover plate 2 and extend outward and are fixedly connected with bevel gears 8. The adjacent two bevel gears 8 in the adjacent two anti-slip wheels 7 are meshed and connected. A motor 9 for driving one of the bevel gears 8 to rotate is fixedly connected to the outer surface of the cover plate 2. By driving the corresponding bevel gear 8 to rotate by the motor 9, the corresponding anti-slip wheel 7 and the bevel gear 8 on the other side of the corresponding anti-slip wheel 7 are rotated. Under the meshing connection, the adjacent bevel gear 8 drives the adjacent anti-slip wheel 7 to rotate, and then the anti-slip wheel 7 on the other side rotates. That is, by using the friction force between the anti-slip wheel 7 and the outer wall of the oil suction pipe 3, the oil suction pipe 3 is lifted and lowered as the anti-slip wheel 7 rotates.

[0026] In addition: One side of the outer barrel wall of the collection barrel 1 is fixedly connected with a liquid inlet pump 5, and a connector 6 is fixedly connected through the bottom of the barrel. The water outlet of the liquid inlet pump 5 is communicated with the inside of the connector 6. A multi-section pipe 10 is rotatably connected to the inner bottom of the collection barrel 1. A turbine 15 is rotatably connected in the connector 6. A connecting frame 16 fixedly connected to the inner pipe wall of the multi-section pipe 10 is fixedly connected to the wheel axle of the turbine 15. The liquid inlet pump 5 provided can use common water pumps on the market. The drilling fluid is sent into the connector 6 along the liquid inlet pump 5, and enters the multi-section pipe 10 along the connector 6. And the turbine 15 in the connector 6 is connected to the multi-section pipe 10 by using the provided connecting frame 16. When the turbine 15 in the connector 6 rotates under the action of the flowing drilling fluid, the multi-section pipe 10 is driven to rotate by using the provided connecting frame 16. A lifting frame 12 is fixedly connected to the outer wall port of a part of the outer pipe of the multi-section pipe 10. The side of the lifting frame 12 is slidably connected to the inner wall of the collection barrel 1, and an oil-water separation membrane 11 is laid on the lifting frame 12. The drilling fluid entering the multi-section pipe 10 is ejected from the top and accumulates on the surface of the oil-water separation membrane 11. Under the filtering action of the oil-water separation membrane 11, the water and oil in the drilling fluid are separated. That is, the floating oil part is intercepted above the lifting frame 12, and the water part passes through the oil-water separation membrane 11 and falls and is discharged. A plurality of stirring blades 17 distributed in an annular array are fixedly connected to the lifting frame 12 on the filtering surface of the oil-water separation membrane 11. When the multi-section pipe 10 rotates, the lifting frame 12 will be driven to rotate, and then the plurality of stirring blades 17 rotate. Under the action of the centrifugal force generated by the rotation of the stirring blades 17, the drilling fluid rotates, and the water and oil in the drilling fluid are quickly stratified by using the centrifugal force. One side of the bottom of the collection barrel 1 is provided in a hollow shape and is used for discharging the drilling fluid.

[0027] Working principle: The drilling fluid is conveyed from bottom to top along the connector 6 and the multi-section pipe 10 by using the liquid inlet pump 5, and the stirring blades 17 are driven to rotate by using the lifting frame 12 to realize the rotation and agitation of the drilling fluid. Under the action of the centrifugal force, the water and oil in the drilling fluid are stratified. The lower layer of water passes through the oil-water separation membrane 11 and falls and is discharged along the hollow part of the bottom of the collection barrel 1, while the upper floating oil layer realizes depth measurement under the detection action of a plurality of water-oil sensors 13. According to the measured depth, a plurality of anti-slip wheels 7 on the cover plate 2 rotate to lower the oil extraction pipe 3 and a plurality of oil extraction heads 14 to the corresponding depth, and the upper floating oil is pumped out by using the oil extraction pump 4.

[0028] The wiring diagram of the oil extraction pump 4, the liquid inlet pump 5, the motor 9 and the water-oil sensor 13 in the present utility model belongs to the

[0029] common general knowledge in the field. Its working principle is already known technology. The model is selected according to actual use. Therefore, the control method and wiring layout of the oil extraction pump 4, the liquid inlet pump 5, the motor 9 and the water-oil sensor 13 will not be explained in detail.

[0030] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution content of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An oil floating collection device in drilling fluid for offshore drilling, comprising a collection barrel (1), characterized in that: A cover plate (2) is provided at the mouth of the collection barrel (1). One side of the outer surface of the cover plate (2) is fixedly connected with an oil pump (4), and an oil suction pipe (3) is penetrated through the center of the outer surface. The bottom end of the oil suction pipe (3) extends to the inner surface of the collection barrel (1) and is communicated with a plurality of oil suction heads (14) distributed in an annular array. The oil suction heads (14) are horizontally arranged tubular structures, and the top edge of the surface of the oil suction heads (14) is provided with strip-shaped hollow-outs. A plurality of water-oil sensors (13) are embedded in the inner barrel wall of the collection barrel (1) near the barrel mouth. A plurality of anti-slip wheels (7) are rotatably connected to the outer surface of the cover plate (2) around the oil suction pipe (3). The surfaces of the wheels of the plurality of anti-slip wheels (7) are in damping cooperation with the outer wall of the oil suction pipe (3), and the plurality of anti-slip wheels (7) rotate at the same speed.

2. The floating oil collection device in the drilling fluid for offshore drilling according to claim 1, wherein: Both ends of the wheel axle of the anti-slip wheel (7) penetrate through the cover plate (2) and extend outward, and are fixedly connected with bevel gears (8). The adjacent two bevel gears (8) among the adjacent two anti-slip wheels (7) are meshed and connected. A motor (9) for driving one of the bevel gears (8) to rotate is fixedly connected to the outer surface of the cover plate (2).

3. The floating oil collection device in the drilling fluid for offshore drilling according to claim 1, characterized in that: A liquid inlet pump (5) is fixedly connected to one side of the outer barrel wall of the collection barrel (1), and a connector (6) is fixedly connected through the bottom position. The water outlet of the liquid inlet pump (5) is communicated with the inside of the connector (6).

4. The floating oil collection device in the drilling fluid for offshore drilling according to claim 3, characterized in that: A multi-section pipe (10) is rotatably connected to the inner bottom of the collection barrel (1). A turbine (15) is rotatably connected to the inside of the connector (6). The wheel axle of the turbine (15) is fixedly connected with a connecting frame (16) connected to the inner wall of the inner pipe of the multi-section pipe (10).

5. The floating oil collection device in the drilling fluid for offshore drilling according to claim 4, characterized in that: A lifting frame (12) is fixedly connected to the outer wall port of the outer part of the multi-section pipe (10). The side of the lifting frame (12) is slidably connected to the inner wall of the collection barrel (1), and an oil-water separation membrane (11) is laid on the lifting frame (12).

6. The floating oil collection device in the offshore drilling drilling fluid according to claim 5, characterized in that: A plurality of stirring blades (17) distributed in an annular array are fixedly connected to the filtering surface of the oil-water separation membrane (11) on the lifting frame (12).

7. The floating oil collection device in the offshore drilling drilling fluid according to claim 3, characterized in that: One side of the bottom of the collection barrel (1) is provided with a hollow-out shape for discharging drilling fluid.

Images