Novel self-adaptive sand filtering pipe for sand prevention of oil well

Abstract

The invention discloses a novel self-adaptive sand filtering pipe for oil well sand prevention, and relates to the technical field of oil extraction sand filtering pipes in the oil industry, the novel self-adaptive sand filtering pipe comprises a base pipe, a sealing plate and an oil inlet hole, fixing rings are symmetrically arranged on the outer side of the base pipe, and a plurality of groups of annular grooves are annularly formed in the outer side of each group of fixing rings; a sliding ring is arranged in each annular groove, a plurality of evenly-distributed connecting columns are connected between the two fixing rings, and an outer screen pipe, an inner screen pipe and a slotted screen pipe are connected between the two fixing rings through the sliding rings correspondingly. When in use, the outer screen pipe, the inner screen pipe and the slotted screen pipe are rotated by directly utilizing the driving assembly and cooperating with the action of the first gear transmission assembly, and the rotating directions and the rotating speeds of the adjacent two screen pipes are different, so that multiple filtering can be realized, and in the filtering process, due to the rotation of the screen pipes, the filtering efficiency is improved, and the filtering effect is improved. Therefore, blockage during sand falling is avoided, and the filtering efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production sand control pipes in the oil industry, and particularly to a novel self - adaptive sand control pipe for oil well sand control. Background Art

[0002] In the field of oilfield exploitation, sand production from oil layers is a common problem in the exploitation of unconsolidated sandstone reservoirs. Sand production from oil layers not only affects the oil production quality, but also blocks the oil production pipeline, affecting the normal progress of oilfield exploitation. To address this problem, the current conventional sand control processes for oil wells include: mechanical sand control, chemical sand control, composite sand control, etc., and sand control screens are used in all of these sand control processes.

[0003] In recent years, the main sand control methods include gravel packing, chemical sand control, and mechanical sand control, etc. Approximately 80% of oil and gas wells worldwide use mechanical sand control methods to control sand, and mechanical sand control dominates among sand control methods. The screen pipe is the core component in mechanical sand control.

[0004] The existing sand control structure of the screen pipe is relatively simple. Under the direct and continuous scouring of sand - containing crude oil, the sand control efficiency of the screen pipe is greatly reduced, further shortening the service life of the screen pipe. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a novel self - adaptive sand control pipe for oil well sand control to solve the technical problems of relatively simple structure, greatly reduced sand control efficiency, and shortened service life in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: A novel self - adaptive sand control pipe for oil well sand control, including a base pipe, a sealing plate, and an oil inlet hole. A plurality of groups of oil inlet holes are evenly opened on the outer side of the base pipe. Fixed rings are symmetrically arranged on the outer side of the base pipe. A plurality of groups of annular grooves are annularly opened on the outer side of each fixed ring, and a sliding ring is arranged inside each group of annular grooves. A plurality of evenly distributed connecting columns are connected between the two fixed rings. An outer screen pipe, an inner screen pipe, and a slotted screen pipe are respectively connected between the two fixed rings through the sliding rings. A support assembly matched with the fixed ring is arranged on the outer side of the base pipe. A first connecting ring, a second connecting ring, and a third connecting ring are respectively connected to the outer side of the fixed ring through the sliding rings. A motor is installed on the outer side of the support assembly. A first gear transmission assembly is arranged between the output end of the motor and the first connecting ring, the second connecting ring, and the third connecting ring. A reciprocating lead screw is rotatably connected to the bottom between the two fixed rings. A second gear transmission assembly is arranged between one end of the reciprocating lead screw and the first connecting ring. A first scraping assembly matched with the connecting column is threadedly connected to the outer side of the reciprocating lead screw. A second scraping assembly matched with the outer screen pipe, the inner screen pipe, the slotted screen pipe, and the base pipe is respectively arranged on the outer side of one group of connecting columns.

[0007] By adopting the above technical solution, by utilizing the driving component and the cooperation of the first gear transmission component, the outer screen pipe, the inner screen pipe and the slotted screen pipe are rotated, and the rotation directions and speeds of adjacent two are different, so that multiple filtrations can be achieved. And during the filtration process, since the screen pipes rotate, the filtration efficiency is accelerated, thereby avoiding blockage when sand grains fall, and further improving the filtration efficiency. Secondly, with the cooperation of the connecting column and the second scraper, it is convenient to effectively scrape the surfaces of the outer screen pipe, the inner screen pipe and the slotted screen pipe, thereby further improving the filtration efficiency of the equipment. Finally, under the action of the second gear transmission component, the reciprocating lead screw is driven to rotate, and then with the cooperation of the symmetrical connecting columns, a limiting and guiding effect is formed for the first scraper, so that the first scraper reciprocates along the direction of the reciprocating lead screw, thereby facilitating the movement of the sand grains accumulated at the bottom of the outer screen pipe to both ends, leaving a space at the bottom to avoid reverse blockage of the outer screen pipe, thus greatly improving the working efficiency.

[0008] The present invention is further configured such that a sealing plate is provided at one end of the base pipe, a sealing sleeve is provided on the outer side of one end of the base pipe, and a sealing cover cooperating with the fixed ring is provided at one end of the sealing sleeve.

[0009] By adopting the above technical solution, with the function of the sealing plate, it is convenient to ensure the sealing at the bottom of the base pipe. Then, with the function of the sealing sleeve, the sealing is further ensured. Finally, with the function of the sealing cover, it is convenient to protect electrical components such as motors, thus completing the work.

[0010] The present invention is further configured such that the support component includes a first fixing plate, a connecting plate and a second fixing plate. The first fixing plate and the second fixing plate are symmetrically provided on the outer side of the base pipe. The outer side of the first fixing plate is uniformly connected with connecting plates connected to the fixed ring. The second fixing plate slides between the first connecting ring and the third connecting ring.

[0011] By adopting the above technical solution, with the functions of the first fixing plate, the connecting plate and the second fixing plate, it is convenient to ensure the fixation of the fixed ring, thereby ensuring the stable sliding of the sliding ring, thus completing the work.

[0012] The present invention is further configured such that the first gear transmission component includes a first gear, a third gear, a first tooth ring and a third tooth ring. A first gear is provided at the output end of the motor. A third gear is rotatably connected to the outer side of the second fixing plate. First tooth rings cooperating with the first gear are provided on the outer sides of the first connecting ring and the third connecting ring. Third tooth rings cooperating with the third gear are provided on the outer sides of the first connecting ring and the second connecting ring.

[0013] By adopting the above technical solution, the functions of the first gear, the third gear, the first gear ring and the third gear ring are utilized to facilitate the normal rotation of the first connecting ring, the second connecting ring and the third connecting ring, so as to complete the subsequent work.

[0014] The present invention is further configured such that the second gear transmission assembly includes a second gear ring and a second gear. A second gear ring is provided on the outer side of the first connecting ring, and one end of the reciprocating lead screw is provided with a second gear meshing with the second gear ring.

[0015] By adopting the above technical solution, the functions of the second gear ring and the second gear are utilized to facilitate driving the reciprocating lead screw to rotate, so as to cooperate with the subsequent work.

[0016] The present invention is further configured such that the first scraping assembly includes a first scraping plate. A first scraping plate cooperating with the connecting column is provided on the outer side of the reciprocating lead screw.

[0017] By adopting the above technical solution, the function of the first scraping plate is utilized to facilitate scraping the sand grains to avoid blockage.

[0018] The present invention is further configured such that the second scraping assembly includes a second scraping plate. Second scraping plates cooperating with the outer screen pipe, the inner screen pipe and the slotted screen pipe are respectively provided at the top between the two fixed rings through the connecting column.

[0019] By adopting the above technical solution, the function of the second plate is utilized to facilitate scraping the sand grains adhered to the surfaces of the outer screen pipe, the inner screen pipe and the slotted screen pipe to avoid blockage.

[0020] In summary, the present invention mainly has the following beneficial effects: When the present invention is in use, directly utilizing the driving assembly and the cooperation of the first gear transmission assembly, the outer screen pipe, the inner screen pipe and the slotted screen pipe are rotated, and the rotation directions and speeds of adjacent two are different, so as to achieve multiple filtration. And during the filtration process, since the screen pipes rotate, the filtration efficiency is accelerated, so as to avoid blockage when the sand grains fall, thereby improving the filtration efficiency. Secondly, with the cooperation of the connecting column and the second scraping plate, it is convenient to effectively scrape the surfaces of the outer screen pipe, the inner screen pipe and the slotted screen pipe, thereby further improving the filtration efficiency of the equipment. Finally, under the action of the second gear transmission assembly, the reciprocating lead screw is driven to rotate, and then with the cooperation of the symmetric connecting columns, a limiting and guiding effect is formed for the first scraping plate, so that the first scraping plate reciprocates along the direction of the reciprocating lead screw, so as to facilitate moving the sand grains accumulated at the bottom of the outer screen pipe to both ends, leaving a space at the bottom to avoid reverse blockage of the outer screen pipe, thereby greatly improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a side view of the present invention; Figure 3 is a schematic diagram of the front sectional structure of the present invention; Figure 4 is a schematic diagram of the side sectional structure of the present invention; Figure 5 is a schematic diagram of the internal structure of the present invention; Figure 6 of the present invention Figure 5 is an enlarged view of part A; Figure 7 is a schematic diagram of a partial structure of the present invention.

[0022] In the figure: 1, base pipe; 2, first fixing plate; 3, connecting plate; 4, fixing ring; 5, sliding ring; 6, outer screen pipe; 7, inner screen pipe; 8, slotted screen pipe; 9, connecting column; 10, sealing cover; 11, first scraping plate; 12, oil inlet hole; 13, sealing plate; 14, sealing sleeve; 15, second fixing plate; 16, motor; 17, first gear; 18, reciprocating lead screw; 19, second gear; 20, first connecting ring; 21, second connecting ring; 22, third connecting ring; 23, first toothed ring; 24, second toothed ring; 25, third gear; 26, third toothed ring; 27, second scraping plate. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0024] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0025] A novel self - adaptive sand - control filter tube for oil wells, as Figure 1-7As shown in the figure, it includes a base pipe 1, a sealing plate 13 and an oil inlet hole 12. A plurality of groups of oil inlet holes 12 are evenly arranged on the outer side of the base pipe 1. Fixed rings 4 are symmetrically arranged on the outer side of the base pipe 1. A plurality of groups of annular grooves are annularly arranged on the outer side of each group of fixed rings 4, and a sliding ring 5 is arranged inside each group of annular grooves. A plurality of evenly distributed connecting columns 9 are connected between the two groups of fixed rings 4. An outer screen pipe 6, an inner screen pipe 7 and a slotted screen pipe 8 are respectively connected between the two groups of fixed rings 4 through the sliding rings 5. A support assembly matched with the fixed ring 4 is arranged on the outer side of the base pipe 1. A first connecting ring 20, a second connecting ring 21 and a third connecting ring 22 are respectively connected to the outer side of the fixed ring 4 through the sliding rings 5. A motor 16 is installed on the outer side of the support assembly. A first gear transmission assembly is arranged between the output end of the motor 16 and the first connecting ring 20, the second connecting ring 21 and the third connecting ring 22. A reciprocating lead screw 18 is rotatably connected to the bottom between the two groups of fixed rings 4. A second gear transmission assembly is arranged between one end of the reciprocating lead screw 18 and the first connecting ring 20. By means of the driving assembly and the cooperation of the first gear transmission assembly, the outer screen pipe 6, the inner screen pipe 7 and the slotted screen pipe 8 are rotated, and the rotation directions and speeds of adjacent two are different, so that multiple filtration can be achieved. A first scraping assembly matched with the connecting column 9 is threadedly connected to the outer side of the reciprocating lead screw 18. A second scraping assembly matched with the outer screen pipe 6, the inner screen pipe 7, the slotted screen pipe 8 and the base pipe 1 is respectively arranged on the outer side of a group of connecting columns 9. During the filtration process, since the screen pipes rotate, the filtration efficiency is increased, so as to avoid blockage when sand grains fall, and thus the filtration efficiency is improved. Secondly, with the cooperation of the connecting column 9 and the second scraper 27, it is convenient to effectively scrape the surfaces of the outer screen pipe 6, the inner screen pipe 7 and the slotted screen pipe 8, thereby further improving the filtration efficiency of the equipment.

[0026] Please refer to Figure 2 , a sealing plate 13 is arranged at one end of the base pipe 1. By means of the sealing plate 13, it is convenient to ensure the sealing of the bottom of the base pipe 1. A sealing sleeve 14 is arranged on the outer side of one end of the base pipe 1. By means of the sealing sleeve 14, the sealing is further ensured. A sealing cover 10 matched with the fixed ring 4 is arranged at one end of the sealing sleeve 14. By means of the sealing cover 10, it is convenient to protect electrical components such as the motor 16, so as to complete the work.

[0027] Please refer to Figure 2, The support assembly includes a first fixing plate 2, a connecting plate 3 and a second fixing plate 15. By the action of the first fixing plate 2, the connecting plate 3 and the second fixing plate 15, it is convenient to ensure the fixation of the fixing ring 4, so as to ensure the stable sliding of the sliding ring 5 and complete the work. The first fixing plate 2 and the second fixing plate 15 are symmetrically arranged on the outer side of the base pipe 1. The outer side of the first fixing plate 2 is evenly connected with the connecting plate 3 connected to the fixing ring 4 to complete the fixation of a group of fixing rings 4. The second fixing plate 15 slides with the first connecting ring 20 and the third connecting ring 22, which is convenient for supporting the outer screen pipe 6, the inner screen pipe 7 and the slotted screen pipe 8.

[0028] Please refer to Figure 5 , The first gear transmission assembly includes a first gear 17, a third gear 25, a first gear ring 23 and a third gear ring 26. By the action of the first gear 17, the third gear 25, the first gear ring 23 and the third gear ring 26, it is convenient to ensure the normal rotation of the first connecting ring 20, the second connecting ring 21 and the third connecting ring 22, so as to complete the subsequent work. The output end of the motor 16 is provided with the first gear 17. The outer side of the second fixing plate 15 is rotatably connected with the third gear 25. The outer sides of the first connecting ring 20 and the third connecting ring 22 are both provided with the first gear ring 23 that cooperates with the first gear 17. Thus, the rotating first gear 17 drives the first connecting ring 20 and the third connecting ring 22 to rotate. The outer sides of the first connecting ring 20 and the second connecting ring 21 are both provided with the third gear ring 26 that cooperates with the third gear 25, and then drives a group of third gear rings 26 to rotate, so as to complete the rotation of the second connecting ring 21 and complete the work.

[0029] Please refer to Figure 5 and Figure 6 , The second gear transmission assembly includes a second gear ring 24 and a second gear 19. The outer side of the first connecting ring 20 is provided with the second gear ring 24. One end of the reciprocating lead screw 18 is provided with the second gear 19 that meshes with the second gear ring 24. By the action of the second gear ring 24 and the second gear 19, it is convenient to drive the reciprocating lead screw 18 to rotate, so as to cooperate with the subsequent work.

[0030] Please refer to Figure 4 , The first scraping assembly includes a first scraper 11. The outer side of the reciprocating lead screw 18 is provided with the first scraper 11 that cooperates with the connecting column 9. By the action of the first scraper 11, it is convenient to complete the scraping of sand grains to avoid blockage. The first scraping assembly includes a second scraper 27. The tops between the two groups of fixing rings 4 are respectively provided with the second scraper 27 that cooperates with the outer screen pipe 6, the inner screen pipe 7 and the slotted screen pipe 8 through the connecting column 9. By the action of the second scraper 27, it is convenient to complete the scraping of the sand grains adhered to the surfaces of the outer screen pipe 6, the inner screen pipe 7 and the slotted screen pipe 8 to avoid blockage.

[0031] The working principle of the present invention is as follows: When in use, first start the motor 16, which drives the first gear transmission assembly. Specifically, it drives the first gear 17 to rotate, thereby driving two groups of first toothed rings 23, and then rotating the corresponding first connecting ring 20 and the third connecting ring 22. In cooperation with the third toothed ring 26 and the third gear 25, the second connecting ring 21 rotates, and then drives the outer sieve tube 6, the inner sieve tube 7, and the slotted sieve tube 8 to rotate. The rotation directions and speeds of adjacent ones are different, so multiple filtration can be achieved. During the filtration process, since the sieve tubes rotate, the filtration efficiency is increased; During the subsequent rotation process, it will drive the second toothed ring 24 to rotate, thereby driving the second gear 19 to rotate, and then driving the reciprocating lead screw 18 to rotate, so as to drive the first scraping assembly, that is, drive the first scraper 11 to move reciprocally, thus completing the scraping work; When the outer sieve tube 6, the inner sieve tube 7, and the slotted sieve tube 8 rotate, in cooperation with the action of the second scraping assembly, specifically, by the action of the second scraper 27, the surfaces of the outer sieve tube 6, the inner sieve tube 7, and the slotted sieve tube 8 are scraped. In cooperation with the connecting column 9 and the second scraper 27, the surfaces of the outer sieve tube 6, the inner sieve tube 7, and the slotted sieve tube 8 can be effectively scraped, thereby further improving the filtration efficiency of the equipment.

[0032] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and not limitations thereof. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not contribute creatively to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A novel self - adaptive sand - control screen pipe for oil wells, comprising a base pipe (1), a sealing plate (13) and an oil inlet hole (12). A plurality of groups of oil inlet holes (12) are evenly arranged on the outer side of the base pipe (1). It is characterized in that: On the outer side of the base pipe (1), fixing rings (4) are symmetrically arranged. On the outer side of each group of fixing rings (4), multiple groups of annular grooves are annularly formed, and in the interior of each group of annular grooves, sliding rings (5) are arranged. Between the two groups of fixing rings (4), multiple evenly distributed connecting columns (9) are connected. Between the two groups of fixing rings (4), an outer sieve pipe (6), an inner sieve pipe (7) and a slotted sieve pipe (8) are respectively connected through the sliding rings (5). On the outer side of the base pipe (1), a support assembly matching with the fixing ring (4) is arranged. On the outer side of the fixing ring (4), a first connecting ring (20), a second connecting ring (21) and a third connecting ring (22) are respectively connected through the sliding rings (5). On the outer side of the support assembly, a motor (16) is installed. Between the output end of the motor (16) and the first connecting ring (20), the second connecting ring (21) and the third connecting ring (22), a first gear transmission assembly is arranged. At the bottom between the two groups of fixing rings (4), a reciprocating lead screw (18) is rotatably connected. Between one end of the reciprocating lead screw (18) and the first connecting ring (20), a second gear transmission assembly is arranged. On the outer side of the reciprocating lead screw (18), a first scraping assembly matching with the connecting column (9) is threadedly connected. On the outer side of one group of connecting columns (9), a second scraping assembly matching with the outer sieve pipe (6), the inner sieve pipe (7), the slotted sieve pipe (8) and the base pipe (1) is respectively arranged.

2. The novel self - adaptive sand control screen pipe for oil well sand control according to claim 1, characterized in that: One end of the base pipe (1) is provided with a sealing plate (13). On the outer side of one end of the base pipe (1), a sealing sleeve (14) is arranged. One end of the sealing sleeve (14) is provided with a sealing cover (10) matching with the fixing ring (4).

3. The novel self-adaptive sand control screen pipe for oil well sand control according to claim 1, characterized in that: The support assembly includes a first fixing plate (2), a connecting plate (3) and a second fixing plate (15). On the outer side of the base pipe (1), the first fixing plate (2) and the second fixing plate (15) are symmetrically arranged. On the outer side of the first fixing plate (2), connecting plates (3) connected with the fixing ring (4) are evenly connected. Between the second fixing plate (15) and the first connecting ring (20) and the third connecting ring (22), they slide relative to each other.

4. The novel self - adaptive sand - control filter tube for oil wells according to claim 1, wherein: The first gear transmission assembly includes a first gear (17), a third gear (25), a first toothed ring (23) and a third toothed ring (26). The output end of the motor (16) is provided with the first gear (17). On the outer side of the second fixing plate (15), the third gear (25) is rotatably connected. On the outer sides of the first connecting ring (20) and the third connecting ring (22), first toothed rings (23) matching with the first gear (17) are arranged. On the outer sides of the first connecting ring (20) and the second connecting ring (21), third toothed rings (26) matching with the third gear (25) are arranged.

5. The novel self - adaptive sand control pipe for oil wells according to claim 1, characterized in that: The second gear transmission assembly includes a second toothed ring (24) and a second gear (19). On the outer side of the first connecting ring (20), the second toothed ring (24) is arranged. One end of the reciprocating lead screw (18) is provided with a second gear (19) meshing with the second toothed ring (24).

6. The novel self-adaptive sand control pipe for oil wells according to claim 1, characterized in that: The first scraping component includes a first scraper (11), and a first scraper (11) that cooperates with the connecting column (9) is arranged on the outer side of the reciprocating screw rod (18).

7. The novel self - adaptive sand control pipe for oil wells according to claim 1, characterized in that: The second scraping component includes a second scraper (27), and second scrapers (27) that cooperate with the outer screen pipe (6), the inner screen pipe (7), and the slotted screen pipe (8) are respectively arranged on the top between the two fixed rings (4) through the connecting column (9).

Images