Screen type well completion sand filtering pipe

Abstract

The utility model relates to a screen type well completion sand filtering pipe which comprises a sand screening cylinder, one side of the sand screening cylinder protrudes to form a connecting part used for being connected with an oil pipe, a plurality of screen holes are evenly distributed in the side wall of the sand screening cylinder, and the side, close to the connecting part, of the sand screening cylinder is fixedly connected with a sleeve. The side, away from the sand screening cylinder, of the sleeve is fixedly connected with an oil inlet used for allowing petroleum to enter, and the inner side wall of the sleeve is connected with an anti-blocking assembly used for cleaning gravel. The utility model relates to the technical field of petroleum equipment. According to the screen type well completion sand filtering pipe, through the arrangement of the anti-blocking assembly, the spiral blades can be driven to rotate through thrust generated when petroleum flows, so that bristles on the spiral blades clean away sand and stones blocked in screen holes, and the situation that the efficiency is reduced due to the fact that the screen holes are blocked when the screen type well completion sand filtering pipe exploits petroleum can be effectively prevented; and the practicability of the screen type well completion sand filtering pipe can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum equipment, in particular to a screen-type well completion sand filter pipe. Background Art

[0002] Well completion refers to the process of connecting the bottom of the well and the oil layer in a certain structure after the open hole well reaches the designed well depth. Well completion is the last important link in drilling work and the beginning of oil production engineering. It is closely related to the subsequent oil production, water injection and the development of the entire oil and gas field. The quality of oil well completion directly affects the production capacity and economic life of the oil well, and even affects whether the entire oil field can be reasonably developed.

[0003] In the prior art, sand and gravel are inevitably involved in oil extraction. The sand and gravel sucked into the oil pipe will cause the oil pump valve seat to wear, resulting in poor sealing effect, pitting of the valve ball and damage to the pump cylinder. Therefore, a sand filter tube is usually installed at the oil inlet of the oil pipe. The mesh of the sand filter tube will be clogged with sand and gravel during long-term use, thereby reducing the cross-section through which oil can pass, resulting in reduced oil extraction efficiency. Utility Model Content

[0004] According to the deficiencies in the prior art, the purpose of the utility model is to provide a screen-type well completion sand filter pipe so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A screen-type completion sand filter pipe comprises a sand screening barrel, a connection portion for connecting an oil pipe is formed on a protrusion on one side of the sand screening barrel, a plurality of screen holes are evenly distributed on the side wall of the sand screening barrel, a casing is fixedly connected to the side of the sand screening barrel close to the connection portion, an oil inlet for entering oil is fixedly connected to the side of the casing away from the sand screening barrel, and an anti-blocking component for cleaning sand and gravel is connected to the inner side wall of the casing.

[0007] Furthermore, the anti-blocking component includes a turntable, a connecting block and a spiral blade. The inner wall of the casing on the side away from the sand screening cylinder is rotatably connected to the turntable, and the side of the turntable close to the sand screening cylinder is connected to at least two connecting blocks in a circular array with the axis as the reference, and the connecting block is fixedly connected to the spiral blade on the side away from the turntable.

[0008] Furthermore, a side of the spiral blade close to the sand screening cylinder is fixedly connected with bristles, and a side of the bristles away from the spiral blade is in contact with an outer side wall of the sand screening cylinder.

[0009] Furthermore, the spiral blade is spirally wound around the outer wall of the sand screening cylinder, and the length of the spiral blade is greater than the matrix length of the screen holes.

[0010] Furthermore, the inner wall of the side of the sleeve away from the sand screening cylinder gradually shrinks from left to right, so that a funnel portion is formed on the side of the sleeve away from the sand screening cylinder.

[0011] Furthermore, the sieve holes gradually expand from the outside to the inside, so that the sieve holes are trumpet-shaped.

[0012] In summary, the present invention includes at least one of the following beneficial technical effects:

[0013] 1. The screen-type well completion filter pipe can utilize the thrust generated by the flow of oil to drive the spiral blade to rotate through the anti-blocking component, so that the bristles on the spiral blade can clean the sand and gravel blocked in the screen hole, which can effectively prevent the screen-type well completion filter pipe from reducing efficiency due to the blockage of the screen hole when extracting oil, and can effectively improve the practicality of the screen-type well completion filter pipe;

[0014] 2. The screen-type completion sand filter tube is provided with a funnel portion on the casing, so that when the screen-type completion sand filter tube is lifted by the oil recovery pipe, sand and gravel slide down along the inner wall of the casing under the action of gravity, thereby reducing the difficulty of cleaning the screen-type completion sand filter tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The utility model is a structural schematic diagram of a screen-type well completion sand filter pipe.

[0017] Figure 2 The utility model is a schematic diagram of the internal structure of a screen-type well completion sand filter pipe.

[0018] Figure 3 The utility model is a schematic diagram of the internal structure of a sand screening tube in a screen-type well completion sand filter pipe.

[0019] In the figure, 1, sand screening cylinder; 2, connecting part; 3, sieve hole; 4, casing; 5, oil inlet; 6, anti-blocking component; 61, turntable; 62, connecting block; 63, spiral blade; 7, bristles; 8, funnel part. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0021] Example:

[0022] Reference Figure 1 - Figure 3 The utility model discloses a screen-type completion sand filter pipe, comprising a sand screening barrel 1, a connection portion 2 for connecting an oil pipe is formed on one side of the sand screening barrel 1, a plurality of screen holes 3 are evenly distributed on the side wall of the sand screening barrel 1, a casing 4 is fixedly connected to the side of the sand screening barrel 1 close to the connection portion 2, an oil inlet 5 for entering oil is fixedly connected to the side of the casing 4 away from the sand screening barrel 1, and an anti-blocking component 6 for cleaning sand and gravel is connected to the inner side wall of the casing 4.

[0023] In this embodiment, when in use, the connecting part 2 of the sand screening cylinder 1 is connected to the oil inlet of the oil pipe, and then the sand screening cylinder 1 is sunk into the oil well. When the oil pump is started, the oil pump creates negative pressure in the oil pipe, and then the oil is sucked into the sand screening cylinder 1. The oil entering the sand screening cylinder 1 will be filtered by the sieve holes 3, and the sand and gravel carried in the oil will be intercepted. The filtered oil is transported through the oil pipe to complete oil production.

[0024] As oil is extracted, the spiral blades 63 located on the outer wall of the sand screening tube 1 will rotate due to the push of oil, thereby driving the bristles 7 to clean the surface of the sand screening tube 1 and remove the sand and gravel stuck in the sieve holes 3, thereby achieving an anti-blocking effect, allowing the sand screening tube 1 to maintain high efficiency in filtering sand and gravel without slowing down the speed of oil extraction, thereby improving the practicality of the screen-type completion sand filter tube.

[0025] In a further preferred embodiment of the present invention, Figure 2 As shown, the anti-blocking component 6 includes a turntable 61, a connecting block 62 and a spiral blade 63. The inner wall of the casing 4 on the side away from the sand screening cylinder 1 is rotatably connected to the turntable 61, and the side of the turntable 61 close to the sand screening cylinder 1 is connected to at least two connecting blocks 62 in a circular array with the axis as the reference, and the side of the connecting block 62 away from the turntable 61 is fixedly connected to the spiral blade 63.

[0026] In this embodiment, observe Figure 2 It can be found that all the sieve holes 3 are arranged on the side wall of the sand screening cylinder 1. When negative pressure is generated in the oil pipe, the oil will be sucked into the sand screening cylinder 1 from the side of the sand screening cylinder 1. Therefore, the thrust generated by the flow of oil and applied to the spiral blade 63 is small, resulting in the spiral blade 63 being unable to be pushed.

[0027] Since the oil entering through the oil inlet 5 will first contact the sieve hole 3 closest to the oil inlet 5, the sieve hole 3 closest to the oil inlet 5 will first be blocked by sand and gravel, and as the sieve hole 3 is blocked, the suction of the sieve hole 3 decreases, so the blocking range of the sieve hole 3 will gradually move toward the oil pipe. As the distance of the oil advances, the contact time between the oil and the spiral blade 63 will become longer and longer, so when the thrust reaches the maximum static friction force required for the rotation of the turntable 61, the spiral blade 63 is pushed by the oil to rotate, and then the spiral blade 63 cleans the surface of the sand screening cylinder 1, clearing the sand and gravel blocked in the sieve hole 3, thereby effectively preventing the sand screening cylinder 1 from being blocked and causing the oil extraction efficiency to decrease.

[0028] In a further preferred embodiment of the present invention, Figure 2 As shown, the side of the spiral blade 63 close to the sand screening cylinder 1 is fixedly connected with the bristles 7 , and the side of the bristles 7 away from the spiral blade 63 is in contact with the outer wall of the sand screening cylinder 1 .

[0029] In this embodiment, the bristles 7 are provided to clean the sand and gravel stuck on the surface of the sand screening cylinder 1 by utilizing the flexible contact of the bristles 7, thereby preventing the sand screening cylinder 1 from being scratched by direct contact with the spiral blades 63, thereby reducing the wear of the spiral blades 63 during use, and effectively increasing the service life of the anti-blocking component 6.

[0030] In a further preferred embodiment of the present invention, Figure 2 As shown, the spiral blade 63 is spirally wound around the outer wall of the sand screening cylinder 1 , and the length of the spiral blade 63 is greater than the matrix length of the sieve holes 3 .

[0031] In this embodiment, by making the length of the spiral blade 63 greater than the matrix length of the sieve holes 3, the spiral blade 63 can cover all the sieve holes 3 after one rotation, which can effectively improve the efficiency of the anti-blocking component 6 in cleaning the sieve holes 3.

[0032] In a further preferred embodiment of the present invention, Figure 2 As shown, the inner wall of the side of the sleeve 4 away from the sand screening cylinder 1 gradually shrinks from left to right, so that a funnel portion 8 is formed on the side of the sleeve 4 away from the sand screening cylinder 1 .

[0033] In this embodiment, in order to allow oil to flow into the casing 4 in one direction to push the spiral blade 63 to rotate, the casing 4 is only provided with an oil inlet 5 for the entry of oil. This method will cause the sand and gravel cleaned by the anti-blocking component 6 to accumulate in the casing 4. Therefore, a funnel portion 8 is provided on the side of the casing 4 away from the sand screening tube 1. When the oil pipe is recovered to lift the screen-type completion sand filter tube, the sand and gravel can slide down the inner wall of the casing 4 under the action of gravity, thereby reducing the difficulty of cleaning the screen-type completion sand filter tube and making the maintenance of the screen-type completion sand filter tube easier.

[0034] In a further preferred embodiment of the present invention, Figure 3 As shown, the sieve hole 3 gradually expands from the outside to the inside, so that the sieve hole 3 is trumpet-shaped.

[0035] In this embodiment, because the sand and gravel are of irregular shape, when the sand and gravel block the sieve holes 3, there will still be gaps in the sieve holes 3 for oil to pass through. Therefore, the sieve holes 3 are gradually expanded from the outside to the inside to form a trumpet shape, which can increase the flowable cross-section of the oil after passing through the gap, thereby improving the oil passing efficiency and further improving the oil recovery efficiency of the screen-type well completion sand filter pipe.

[0036] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A screen-type well completion sand filter pipe, characterized in that: The invention comprises a sand screening cylinder (1), a connection portion (2) for connecting an oil pipe is formed on one side of the sand screening cylinder (1), a plurality of screen holes (3) are evenly distributed on the side wall of the sand screening cylinder (1), a sleeve (4) is fixedly connected to the side of the sand screening cylinder (1) close to the connection portion (2), an oil inlet (5) for entering oil is fixedly connected to the side of the sleeve (4) away from the sand screening cylinder (1), and an anti-blocking component (6) for cleaning sand and gravel is connected to the inner wall of the sleeve (4); The anti-blocking component (6) comprises a rotating disk (61), a connecting block (62) and a spiral blade (63); the inner wall of a side of the sleeve (4) away from the sand screening cylinder (1) is rotatably connected to the rotating disk (61); a side of the rotating disk (61) close to the sand screening cylinder (1) is connected to at least two connecting blocks (62) in a circular array with the axis as a reference; a side of the connecting block (62) away from the rotating disk (61) is fixedly connected to the spiral blade (63); A brush (7) is fixedly connected to a side of the spiral blade (63) close to the sand screening cylinder (1), and a side of the brush (7) away from the spiral blade (63) is in contact with an outer side wall of the sand screening cylinder (1).

2. The screen-type well completion sand filter according to claim 1, characterized in that: The spiral blade (63) is spirally wound around the outer wall of the sand screening cylinder (1), and the length of the spiral blade (63) is greater than the matrix length of the screen holes (3).

3. The screen-type well completion sand filter according to claim 1, characterized in that: The inner wall of the side of the sleeve (4) away from the sand screening cylinder (1) gradually narrows from left to right, so that a funnel portion (8) is formed on the side of the sleeve (4) away from the sand screening cylinder (1).

4. The screen-type well completion sand filter according to claim 1, characterized in that: The sieve holes (3) gradually expand from the outside to the inside, so that the sieve holes (3) are in a trumpet shape.

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