Well bottom sand setting prevention device for heavy oil well

Abstract

The utility model provides a heavy oil well bottom sand setting prevention device which comprises a sand setting pipe, a tail pipe plug and a sand filtering pipe arranged in the sand setting pipe, a plurality of seams are formed in the wall of a pipe section, where the sand filtering pipe is arranged, of the sand setting pipe, the tail pipe plug is arranged in a lower port of the sand setting pipe, and the sand filtering pipe is arranged in the sand setting pipe. And a space for settling sand is formed between the upper surface of the sand filter pipe and the lower end of the sand filter pipe. According to the utility model, pump blockage caused by gravel due to frequent sand production of a heavy oil well stratum can be prevented, meanwhile, a larger sand setting space is formed, the frequency of later sand burying treatment is reduced, oil channel blockage caused by sand setting accumulation in a shaft is avoided, and continuous production of an ultra-deep heavy oil well is ensured while manpower and material resources are saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of thick oil well bottom sand prevention, and specifically relates to a thick oil well bottom sand prevention device. BACKGROUND

[0002] After the formation of a carbonate rock super-deep thick oil well sand production, three ways of anti-caving screen pipe sand control, gravel packing sand control and pump-down sand control are usually used for sand control treatment. Anti-caving screen pipe sand control uses a section of slotted casing for sand control in the wellbore, which has the disadvantages of sand and mud accumulation outside the pipe wall, difficult post-treatment after sand control hole blockage, and easy complex workover operation once it fails. Gravel packing sand control uses 0.6-1.2mm ceramic sand and 0.30mm precision sand filter pipe, which has high sand control process and operation cost and extremely high workover operation difficulty.

[0003] The existing sand control technology mostly uses sand control pipe for single-layer sand control, which is easy to cause sand burial at the well bottom, has poor sand control effect, leads to frequent sand production of the formation of the thick oil well, and causes gravel pump sticking. Meanwhile, it does not have convenient sand gravel collection and sand burial treatment means. SUMMARY

[0004] One purpose of the utility model is to provide a thick oil well bottom sand prevention device to prevent gravel pump sticking caused by frequent sand production of the formation of the thick oil well, form a large sand accumulation space, reduce the frequency of sand burial treatment in the later period, avoid oil channel blockage caused by sand accumulation in the wellbore, save manpower and material resources, and ensure continuous production of the super-deep thick oil well.

[0005] According to the utility model, a thick oil well bottom sand prevention device is provided, which comprises a sand accumulation pipe, a tail plug and a sand filter pipe arranged in the interior of the sand accumulation pipe. A plurality of slits are formed in the wall of the pipe section of the sand filter pipe in the interior of the sand accumulation pipe. The tail plug is arranged in the lower end of the sand accumulation pipe, and the upper surface of the tail plug and the lower end of the sand filter pipe form a space for sand accumulation.

[0006] In a preferred embodiment, the thick oil well bottom sand prevention device further comprises a bridge joint arranged in the interior of the sand accumulation pipe. The lower end of the bridge joint is connected with the upper end of the sand filter pipe, and the side surface of the bridge joint is connected with the inner wall of the upper end of the sand accumulation pipe.

[0007] In a preferred embodiment, the upper part of the bridge joint is connected with a tail pipe, the upper part of the tail pipe is connected with a pump cylinder, and the pump cylinder is provided with a pump for pumping mixed oil at the well bottom to the ground.

[0008] In a preferred embodiment, the slits are uniformly arranged along the circumference of the wall.

[0009] In a preferred embodiment, the slits are configured as a linear slit.

[0010] In a preferred embodiment, the width of the slit can be adjusted according to the viscosity of the crude oil.

[0011] In a preferred embodiment, the seam width ranges from 0.1 to 0.3 mm.

[0012] In a preferred embodiment, the width of the filter slit provided on the side wall of the filter pipe is smaller than the width of the slit opening.

[0013] In a preferred embodiment, the space for settling sand is configured in a barrel shape.

[0014] In a preferred embodiment, the pump barrel is configured as a cylindrical body.

[0015] This utility model has at least the following technical effects:

[0016] According to this utility model, a sand settling pipe, a tail plug, and a sand filter pipe disposed inside the sand settling pipe are provided. Because the sand settling pipe has multiple slits on the wall of the section with the internal sand filter pipe, these slits serve two purposes: firstly, they act as channels for mixed oil to enter the sand settling pipe; secondly, they provide primary filtration and sand control for gravel. After the mixed oil enters the sand filter pipe, it undergoes secondary filtration and sand control before entering the pump, preventing sand from jamming the pump due to frequent sand production in heavy oil wells. Furthermore, because the tail plug is disposed inside the lower end of the sand settling pipe, a large sand settling space is formed between its upper surface and the lower end of the sand filter pipe. Sand debris after secondary filtration and sand control settles in this sand settling container and can be removed during well workover operations, reducing the frequency of subsequent sand removal and preventing oil passage blockage due to sand accumulation in the wellbore. This saves manpower and resources while ensuring continuous production in ultra-deep heavy oil wells. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of a heavy oil well bottom sand-prevention device according to an embodiment of the present invention is shown.

[0018] In this application, all the accompanying drawings are schematic drawings, used only to illustrate the principle of the present invention, and are not drawn to scale. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of the utility model, it should be understood that the terms "above", "side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] like Figure 1 As shown, the heavy oil well bottom sand-prevention device 100 of this utility model includes: a sand-prevention pipe a, a tail plug 7, and a sand filter pipe 4. The sand filter pipe 4 is disposed inside the sand-prevention pipe a. The sand-prevention pipe a has a tail plug 7 in its lower end. The wall of the section of the sand-prevention pipe a where the sand filter pipe 4 is disposed is provided with multiple slits 5. A barrel-shaped space 6 for sand precipitation is formed between the upper surface of the tail plug 7 and the lower end of the sand filter pipe 4 for collecting the sand and debris deposited after filtration.

[0023] The working principle of the heavy oil well bottom sand prevention device 100 of this utility model is briefly described below. During the production process, the mixed oil formed by the heavy oil in the formation and the light oil in the annulus enters the sand-sinking pipe a from the bottom of the well through multiple slots 5 of the sand-sinking pipe a. The slots 5 are used for primary filtration of sand and gravel. Subsequently, the mixed oil enters the sand-filtering pipe 4 through the side wall of the sand-filtering pipe 4. The side wall of the sand-filtering pipe 4 has filter slots. The width of the filter slots is smaller than the width of the slots 5, which is used for secondary filtration of the mixed oil before entering the pump to prevent sand. The mixed oil filtered by the sand-filtering pipe 4 flows upward through the tailpipe 2 and the pump barrel 1 to reach the surface. The filtered sand and debris are deposited in the sand-sinking pipe a.

[0024] According to this utility model, a sand settling pipe a, a tail plug 7, and a sand filter pipe 4 disposed inside the sand settling pipe a are provided. Since the sand settling pipe a has multiple slots 5 on the wall of the section where the sand filter pipe 4 is disposed, on the one hand, the slots 5 can serve as channels for mixed oil to enter the interior of the sand settling pipe a; on the other hand, the slots 5 can perform primary filtration and sand prevention for gravel. After the mixed oil enters the sand filter pipe 4, it can achieve secondary filtration and sand prevention before entering the pump, preventing sand from jamming the pump due to frequent sand production from the heavy oil well formation. Furthermore, since the tail plug 7 is disposed inside the lower end of the sand settling pipe a, a large sand settling space is formed between its upper surface and the lower end of the sand filter pipe 4. Sand debris after secondary filtration and sand prevention is deposited in this sand settling container and can be removed during well workover operations, reducing the frequency of subsequent sand removal and preventing the oil passage from being blocked by sand accumulation in the wellbore. This saves manpower and resources while ensuring continuous production in ultra-deep heavy oil wells.

[0025] In one or more embodiments, the heavy oil well bottom sand prevention device 100 of the present invention further includes a bridge joint 3 disposed inside the sand settling pipe a, the lower end of the bridge joint 3 being connected to the upper port of the sand filter pipe 4, and the side surface of the bridge joint 3 being connected to the inner wall of the upper port of the sand settling pipe a.

[0026] In one or more embodiments, the upper part of the bridge joint 3 is connected to the tailpipe 2, and the upper part of the tailpipe 2 is connected to the pump cylinder 1. The pump cylinder 1 is equipped with a pump for extracting mixed oil from the bottom of the well to the surface. The pump cylinder 1 is constructed as a cylindrical body.

[0027] In one or more embodiments, the slots 5 are uniformly arranged circumferentially along the wall of the section of the sand settling pipe a in which the filter pipe 4 is disposed inside.

[0028] In one or more embodiments, the opening 5 is configured as a straight opening.

[0029] In one or more embodiments, the specific width of the slit 5 can be adjusted according to the viscosity of the crude oil.

[0030] In one or more embodiments, the seam width of the seam 5 ranges from 0.1 to 0.3 mm.

[0031] In one or more embodiments, the width of the filter slit provided on the side wall of the filter pipe 4 is smaller than the width of the slit 5.

[0032] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for preventing sand settling at the bottom of a heavy oil well, characterized in that, include: The system includes a sedimentation pipe, a tail plug, and a filter pipe disposed inside the sedimentation pipe. The sedimentation pipe has multiple slits on the wall of the section where the filter pipe is disposed inside. The tail plug is disposed inside the lower end of the sedimentation pipe, and its upper surface forms a space for sedimentation between it and the lower end of the filter pipe.

2. The heavy oil well bottom sand prevention device according to claim 1, characterized in that, It also includes a bridging joint disposed inside the sand settling pipe, the lower end of the bridging joint being connected to the upper port of the sand settling pipe, and the side surface being connected to the inner wall of the upper port of the sand settling pipe.

3. The heavy oil well bottom sand-prevention device according to claim 2, characterized in that, The upper part of the bridge joint is connected to the tailpipe, and the upper part of the tailpipe is connected to the pump cylinder. The pump cylinder is equipped with a pump for extracting the mixed oil from the bottom of the well to the surface.

4. The heavy oil well bottom sand-prevention device according to claim 1, characterized in that, The seams are evenly distributed along the circumference of the wall.

5. The heavy oil well bottom sand-prevention device according to claim 4, characterized in that, The seam opening is constructed as a straight line.

6. The heavy oil well bottom sand prevention device according to claim 5, characterized in that, The width of the slit can be adjusted according to the viscosity of the crude oil.

7. The heavy oil well bottom sand-prevention device according to claim 5, characterized in that, The seam width ranges from 0.1 to 0.3 mm.

8. The heavy oil well bottom sand prevention device according to claim 6 or 7, characterized in that, The width of the filtration slits on the side wall of the filter pipe is smaller than the width of the slit opening.

9. The heavy oil well bottom sand-prevention device according to claim 1, characterized in that, The space used for sedimentation is constructed in a barrel shape.

10. The heavy oil well bottom sand-prevention device according to claim 3, characterized in that, The pump barrel is constructed as a cylindrical body.

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