Anti-blocking screen pipe

Abstract

The utility model discloses an anti-blocking sieve tube, which belongs to the technical field of sieve tubes and comprises a base tube, a plurality of filter holes are arranged on the base tube, an inner support sleeve is sleeved outside the base tube and made of elastic deformation materials, a bottom support diffusion layer is sleeved outside the inner support sleeve, and the bottom support diffusion layer is made of elastic deformation materials. A metal sintered felt filtering layer is arranged outside the bottom supporting diffusion layer in a sleeving manner; according to the utility model, the inner supporting sleeve is arranged, and the inner supporting sleeve is made of an elastic deformation material, so that when fluid passes through the filtering sleeve which is the filtering hole, the inner supporting sleeve is deformed due to the increase of the borne pressure when the overflowing hole in the inner supporting sleeve is blocked by dirt, and the overflowing hole in the inner supporting sleeve is pressurized, expanded and enlarged; therefore, blockages can be smoothly discharged, overflowing is recovered, the anti-blocking effect of filtering and circulating fluid in the base pipe is achieved, and the filtering and blocking effect on stratum sand is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of screen pipes, and in particular relates to an anti-blocking screen pipe. Background Art

[0002] During the oil collection process, some formation sand will enter the wellbore with the fluid. In severe cases, it will cause the bottom of the well to collapse and bury the oil layer sand, and it will also cause pump jams and oil pipe sand blockages, accelerate the corrosion and wear of casing and downhole tools, thereby affecting production, increasing the workload, and causing unnecessary increase in oil production costs. For this reason, effective measures need to be taken to block the formation sand outside the wellbore without affecting production. Therefore, a screen tube is needed for filtration. However, traditional screen tubes are often easily blocked inside the base pipe due to the multi-layer casing after being used for a long time, resulting in poor filtration effect of the screen tube. Therefore, an anti-clogging screen tube is needed to solve the above problems. Utility Model Content

[0003] The utility model aims to provide an anti-clogging screen pipe to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-clogging screen pipe, comprising a base pipe, a plurality of filter holes are opened on the base pipe, the outer sleeve of the base pipe is provided with an inner support sleeve, the inner support sleeve is made of elastic deformation material, the outer sleeve of the inner support sleeve is provided with a bottom support diffusion layer, the outer sleeve of the bottom support diffusion layer is provided with a metal sintered felt filter layer, the outer sleeve of the metal sintered felt filter layer is provided with an intermediate support diffusion layer, the outer sleeve of the intermediate support diffusion layer is provided with a metal dense mesh filter layer, the outer sleeve of the metal dense mesh filter layer is provided with an outer protective support sleeve, and the bottom end of the outer protective support sleeve is fixedly provided with a bottom support ring.

[0005] By setting an inner support sleeve, since the inner support sleeve is made of elastic deformable material, when the fluid passes through the filter sleeve of the filter hole, as the dirt blocks the flow holes on the inner support sleeve, the inner support sleeve will be deformed due to the increase in pressure, which will cause the flow holes on the inner support sleeve to be pressurized and expanded, so that the blockage can be discharged smoothly and the flow can be restored, which helps to achieve an anti-blocking effect on the filtration and circulation of the fluid in the base pipe, thereby facilitating the filtration and blocking effect on the formation sand.

[0006] As a preferred implementation, the base pipe is provided with spiral holes.

[0007] As a preferred embodiment, the metal sintered felt filter layer and the metal dense mesh filter layer are separated by an intermediate support diffusion layer.

[0008] As a preferred embodiment, the inner support sleeve, the bottom support diffusion layer, the metal sintered felt filter layer, the middle support diffusion layer, the metal dense mesh filter layer, the outer protective support sleeve and the base pipe are all made of corrosion-resistant materials.

[0009] As a preferred embodiment, the material composed of the base pipe and the outer protective support sleeve has rigidity and hardness.

[0010] As a preferred implementation, the bottom support ring is made of metal material.

[0011] By setting multiple filter sleeve layers as corrosion-resistant materials, adding metal filter layers such as metal sintered felt filter layers and metal dense mesh filter layers on the screen pipe, and the base pipe and outer protective support sleeve have a certain rigidity and hardness, the screen pipe has good anti-corrosion effect and material strength, which helps to improve the filtering accuracy and life of the screen pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model provides an inner support sleeve. Since the inner support sleeve is made of an elastic deformable material, when the fluid passes through the filter sleeve of the filter hole, as dirt blocks the flow holes on the inner support sleeve, the inner support sleeve will be deformed due to the increase in pressure it bears, which will cause the flow holes on the inner support sleeve to be pressurized and expanded, so that the blockage can be discharged smoothly and the flow can be restored, which helps to achieve an anti-blocking effect on the filtration and circulation of the fluid in the base pipe, thereby facilitating the filtration and blocking effect on the formation sand.

[0014] The utility model provides a plurality of filter sleeve layers with corrosion-resistant materials, and combines a metal sintered felt filter layer and a metal dense mesh filter layer on the screen pipe, and the base pipe and the outer protective support sleeve have certain rigidity and hardness, so that the screen pipe has good anti-corrosion effect and material strength, thereby helping to improve the filtering accuracy and service life of the screen pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 It is a schematic diagram of a partial three-dimensional structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner support sleeve of the utility model.

[0018] In the figure: 1. base pipe; 2. filter hole; 3. inner support sleeve; 4. bottom support diffusion layer; 5. metal sintered felt filter layer; 6. middle support diffusion layer; 7. metal dense mesh filter layer; 8. outer protective support sleeve; 9. bottom support ring; 10. spiral hole. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] The following examples are used to illustrate the present invention, but cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0021] See also Figure 1-3 The utility model provides an anti-clogging screen pipe, including a base pipe, a plurality of filter holes 2 are opened on the base pipe 1, an inner support sleeve 3 is provided on the outer side of the base pipe 1, the inner support sleeve 3 is made of elastic deformation material, a bottom support diffusion layer 4 is provided on the outer side of the inner support sleeve 3, a metal sintered felt filter layer 5 is provided on the outer side of the bottom support diffusion layer 4, a middle support diffusion layer 6 is provided on the outer side of the middle support diffusion layer 6, a metal dense mesh filter layer 7 is provided on the outer side of the metal dense mesh filter layer 7, an outer protective support sleeve 8 is provided on the outer side of the metal dense mesh filter layer 7, and an outer protective support sleeve 8 is provided on the outer side of the metal dense mesh filter layer 7. A bottom support ring 9 is fixedly provided at the bottom end of the protective support sleeve 8. By providing the inner support sleeve 3, since the inner support sleeve 3 is made of elastic deformable material, when the fluid passes through the filter hole 2, as the dirt blocks the flow holes on the inner support sleeve 3, the inner support sleeve 3 will be deformed due to the increase in pressure, which will cause the flow holes on the inner support sleeve 3 to be pressurized and expanded, so that the blockage can be discharged smoothly and the flow can be restored, which helps to achieve an anti-blocking effect on the filtration and circulation of the fluid in the base pipe 1, thereby facilitating the filtration and blocking effect on the formation sand.

[0022] The base pipe 1 is provided with a spiral hole 10 .

[0023] The metal sintered felt filter layer 5 and the metal dense mesh filter layer 7 are separated by an intermediate support diffusion layer 6 .

[0024] The inner support sleeve 3, the bottom support diffusion layer 4, the metal sintered felt filter layer 5, the middle support diffusion layer 6, the metal dense mesh filter layer 7, the outer protective support sleeve 8 and the base pipe 1 are all made of corrosion-resistant materials.

[0025] The material composed of the base pipe 1 and the outer protection support sleeve 8 has rigidity and hardness.

[0026] The bottom support ring 9 is made of metal material. By setting multiple filter sleeve layers as corrosion-resistant materials, adding metal sintered felt filter layer 5 and metal dense mesh filter layer 7 on the screen tube, and the base pipe 1 and the outer protective support sleeve 8 have certain rigidity and hardness, the screen tube has good anti-corrosion effect and material strength, which helps to improve the filtering accuracy and life of the screen tube.

[0027] The working principle and use process of the utility model are as follows: firstly, since the inner support sleeve 3 is made of elastic deformation material, when the fluid passes through the filter hole 2, as the dirt blocks the flow holes on the inner support sleeve 3, the inner support sleeve 3 will be deformed due to the increase in pressure, thereby causing the flow holes on the inner support sleeve 3 to be pressurized and expanded, so that the blockage can be discharged smoothly and the flow is restored, which helps to achieve the anti-blocking effect on the filtration and circulation of the fluid in the base pipe 1. In addition, by setting multiple filter sleeve layers to corrosion-resistant materials, the metal sintered felt filter layer 5 and the metal dense mesh filter layer 7 are added to the screen tube, and the base tube 1 and the outer protective support sleeve 8 have a certain rigidity and hardness, so that the screen tube has a good anti-corrosion effect and material strength, which helps to improve the filtration accuracy and life of the screen tube.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-clogging screen pipe, comprising a base pipe (1), characterized in that: The base tube (1) is provided with a plurality of filter holes (2); the base tube (1) is externally sleeved with an inner support sleeve (3); the inner support sleeve (3) is made of an elastic deformable material; the inner support sleeve (3) is externally sleeved with a bottom support diffusion layer (4); the bottom support diffusion layer (4) is externally sleeved with a metal sintered felt filter layer (5); the metal sintered felt filter layer (5) is externally sleeved with an intermediate support diffusion layer (6); the intermediate support diffusion layer (6) is externally sleeved with a metal dense mesh filter layer (7); the metal dense mesh filter layer (7) is externally sleeved with an outer protective support sleeve (8); a bottom support ring (9) is fixedly provided at the bottom end of the outer protective support sleeve (8).

2. The anti-clogging screen pipe according to claim 1, characterized in that: The base pipe (1) is provided with a spiral hole (10).

3. The anti-clogging screen pipe according to claim 1, characterized in that: The metal sintered felt filter layer (5) and the metal dense mesh filter layer (7) are separated by an intermediate support diffusion layer (6).

4. The anti-clogging screen pipe according to claim 1, characterized in that: The inner support sleeve (3), the bottom support diffusion layer (4), the metal sintered felt filter layer (5), the middle support diffusion layer (6), the metal dense mesh filter layer (7), the outer protective support sleeve (8) and the base pipe (1) are all made of corrosion-resistant materials.

5. The anti-clogging screen pipe according to claim 1, characterized in that: The material composed of the base pipe (1) and the outer protective support sleeve (8) has rigidity and hardness.

6. The anti-clogging screen pipe according to claim 1, characterized in that: The bottom support ring (9) is made of metal material.

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