Plug-in float collar shoe

Abstract

The utility model discloses a plug-in type float collar shoe, which belongs to the technical field of float shoes and comprises a barrel and a hemisphere, the barrel is communicated with the hemisphere, external threads are arranged at the top end of the side wall of the barrel, a reaming strip is fixed on the side wall of the barrel, a through hole is arranged on the side surface of the hemisphere, a mounting groove is arranged at the inner edge of the top end of the barrel, and the mounting groove is communicated with the barrel. An anti-backflow piece is arranged in the mounting groove and comprises an upper disc, an inner column, an upper ring, a lower ring and a spring, a sliding groove is formed in the inner wall of the barrel, sliding blocks are fixed to the side walls of the upper ring and the lower ring, the upper disc is fixed in the mounting groove in a threaded mode, and openings are symmetrically formed in the two sides of the center of the top end of the upper disc; a cavity is formed in the inner column, an upper opening and a lower opening are symmetrically formed in the side wall of the cavity, and in this way, the anti-backflow piece is inserted and fixed into the barrel body, so that the barrel body and the anti-backflow assembly are detachably connected, and disassembly, assembly and use are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of float shoes, in particular to an inserted float hoop shoe. Background Art

[0002] Cementing is the process of running casing into a well and injecting cement into the annular space between the wellbore and the casing. Float collars and casing are typically used to direct the cement slurry into the formation, thereby achieving cementing. A float collar, or simply a float shoe, primarily functions to guide the casing string into the well by generating buoyancy and adjust the buoyancy applied to the casing string during casing lowering. Typically installed at the lowest end of the casing string, it consists of a body made of alloy structural steel and a hemispherical cement or metal head at the lower end, used to guide the lowering of the casing.

[0003] The existing Chinese patent application number CN202323615940.5 discloses a reaming type float hoop shoe, including a shell, a main body unit, a pipe unit and an anti-backflow unit; the shell is installed with the main body unit; the main body unit includes a guide shoe, a circular through hole and a threaded connecting column, the upper end of the shell is fixedly connected to the threaded connecting column, the lower end of the shell is fixedly connected to the guide shoe, and the outer side of the circular through hole is fixedly connected with multiple circular through holes; the pipe unit is installed on the shell; the anti-backflow unit is installed on the shell, and the device can automatically and stably prevent liquid backflow, but when it is in use, the anti-backflow device and the float shoe body are integrated, and when damaged, they need to be replaced and repaired as a whole, which is inconvenient to use.

[0004] Based on this, the utility model designs an insertable floating hoop shoe to solve the above problems. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides an insertable floating hoop shoe.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] An insertable floating hoop shoe comprises a cylinder and a hemisphere, the cylinder and the hemisphere are connected, an external thread is provided on the top of the side wall of the cylinder, an eyelet strip is fixed on the side wall of the cylinder, a through hole is provided on the side of the hemisphere, a mounting groove is provided on the inner edge of the top of the cylinder, a backflow prevention part is provided in the mounting groove, the backflow prevention part comprises an upper plate, an inner column, an upper ring, a lower ring and a spring, a sliding groove is provided on the inner wall of the cylinder, sliders are fixed on the side walls of the upper ring and the lower ring, the upper plate is threadedly fixed in the mounting groove, openings are symmetrically provided on both sides of the center of the top of the upper plate, a cavity is provided inside the inner column, and an upper opening and a lower opening are symmetrically provided on the side walls of the cavity.

[0008] Furthermore, the circumference of the scoring strip is evenly welded and arranged at a lower middle position of the side wall of the cylinder, and the circumference of the through hole is evenly arranged on the side wall of the hemisphere.

[0009] Furthermore, the inner column is fixed at the center of the bottom end of the upper plate, the spring is fixed between the upper ring and the lower ring, and the upper ring and the lower ring slide on the outside of the inner column.

[0010] Furthermore, the width of the upper opening is smaller than the thickness of the upper ring, and the horizontal plane at the top end of the lower opening is lower than the horizontal plane at the bottom end of the chute.

[0011] Furthermore, a limiting plate is fixed at the bottom end of the upper ring, and a limiting groove is formed at the top end of the lower ring. When the bottom end of the limiting plate contacts the bottom end of the limiting groove, the top end of the upper ring is located between the top and bottom ends of the upper opening.

[0012] Furthermore, a closed ring is fixed to the bottom end of the lower ring, the height of the closed ring is greater than the length of the slide groove, and the closed ring and the inner column are not in contact.

[0013] Furthermore, the bottom end of the cylinder and the hemisphere are cooperatively provided with connecting screw holes, and the connecting screw holes are threadedly connected with connecting bolts.

[0014] Furthermore, a hidden groove is provided at the end of the connecting screw hole on the hemisphere, and the hidden end of the connecting bolt is hidden in the hidden groove. Beneficial effects

[0015] 1. By setting the eyelet strip, the obstructed points on the well wall can be eyeleted during the casing operation to reduce the resistance of lowering the casing; by setting the anti-backflow piece, chute, slider, opening, cavity, upper opening and lower opening, as the external casing continues to go deeper, when the internal pressure is greater than the grouting pressure, the pressure on the lower ring increases. Under the cooperation of the chute and slider, the lower ring and the upper ring move up to close the upper opening. When the upper ring contacts the bottom of the upper plate, the opening is closed to prevent slurry backflow; by setting the installation groove, the anti-backflow piece can be inserted and installed in the installation groove. When maintenance is required, the anti-backflow piece can be taken out of the barrel for easy use;

[0016] 2. By setting a limit plate and a limit groove, when the upper ring moves downward, the limit plate enters the limit groove to assist in positioning the upper ring; by setting a closing ring, the upper opening is closed when the lower ring and the upper ring move upward. During the process, the closing ring closes the slide groove to prevent slurry from entering; by setting connecting screw holes, connecting bolts and hidden grooves, the connecting screw holes are threadedly connected with the connecting bolts to fix the cylinder and the hemisphere, which is convenient for loading and unloading the two, and the connecting bolts are hidden in the hidden groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0018] Figure 1 This is a three-dimensional diagram of the main structure of an insertable floating hoop shoe of the utility model;

[0019] Figure 2 This is a three-dimensional diagram of the cylindrical structure of an insertable floating hoop shoe of the present invention;

[0020] Figure 3 The utility model is a three-dimensional cylindrical structure of an insertable floating hoop shoe Figure 2 ;

[0021] Figure 4 This is a three-dimensional diagram of the hemispherical structure of an insertable floating hoop shoe of the present invention;

[0022] Figure 5 This is a three-dimensional diagram of the anti-backflow structure of an insertable floating hoop shoe of the utility model;

[0023] Figure 6 This is a three-dimensional diagram of the lower ring structure of an insertable floating hoop shoe of the present utility model.

[0024] The numbers in the figure represent:

[0025] 1. Cylinder; 2. Hemisphere; 3. External thread; 4. Eyelet strip; 5. Through hole; 6. Mounting slot; 7. Upper plate; 8. Inner column; 9. Upper ring; 10. Lower ring; 11. Spring; 12. Slide groove; 13. Slider; 14. Opening; 15. Cavity; 16. Upper opening; 17. Lower opening; 18. Limiting piece; 19. Limiting slot; 20. Closing ring; 21. Connecting screw hole; 22. Connecting bolt; 23. Hidden slot. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] The present invention will be further described below with reference to the embodiments.

[0028] In some embodiments, please refer to the accompanying drawings. Figure 1 、 Figure 2 and Figure 5 , an insert-type floating hoop shoe, comprising a cylinder 1 and a hemispherical body 2, the cylinder 1 and the hemispherical body 2 are connected, an external thread 3 is opened on the top of the side wall of the cylinder 1, a scratching strip 4 is fixed on the side wall of the cylinder 1, a through hole 5 is opened on the side of the hemispherical body 2, a mounting groove 6 is opened on the inner edge of the top of the cylinder 1, an anti-backflow component is arranged in the mounting groove 6, the anti-backflow component comprises an upper plate 7, an inner column 8, an upper ring 9, a lower ring 10 and a spring 11, a sliding groove 12 is opened on the inner wall of the cylinder 1, a slider 13 is fixed on the side walls of the upper ring 9 and the lower ring 10, the upper plate 7 is threadedly fixed in the mounting groove 6, openings 14 are symmetrically opened on both sides of the center of the top of the upper plate 7, a cavity 15 is opened inside the inner column 8, and an upper opening 16 and a lower opening 17 are symmetrically opened on the side walls of the cavity 15;

[0029] When the slurry is injected into the cylinder 1, the upper ring 9 is pressed against the spring 11, and the spring 11 is compressed, and the upper ring 9 moves downward until the upper opening 16 leaks out. The slurry enters the cavity 15 and enters the hemisphere 2 through the lower opening 17 and leaks out through the through hole 5. As the external casing continues to penetrate deeper, when the internal pressure is greater than the grouting pressure, the pressure on the lower ring 10 increases. Under the cooperation of the slide groove 12 and the slider 13, the lower ring 10 and the upper ring 9 move upward to close the upper opening 16. When the upper ring 9 contacts the bottom end of the upper plate 7, the opening 14 is closed to prevent the slurry from flowing back.

[0030] In the embodiment of the present invention, by providing the eye-marking strip 4, during the casing lowering operation, the obstructed points on the well wall can be eye-marked to reduce the resistance to lowering the casing; by providing the anti-backflow component, the chute 12, the slider 13, the opening 14, the cavity 15, the upper opening 16 and the lower opening 17, as the external casing continues to penetrate deeper, when the internal pressure is greater than the grouting pressure, the pressure on the lower ring 10 increases. Under the cooperation of the chute 12 and the slider 13, the lower ring 10 and the upper ring 9 move up to close the upper opening 16. When the upper ring 9 contacts the bottom end of the upper plate 7, the opening 14 is closed to prevent the slurry from flowing back; by providing the installation groove 6, the anti-backflow component can be inserted and installed in the installation groove 6. When maintenance is required, the anti-backflow component can be taken out from the cylinder 1 for easy use;

[0031] In one embodiment of the present invention, the scoring strips 4 are uniformly welded around the circumference and arranged in the lower middle portion of the side wall of the cylinder 1, and the through holes 5 are uniformly arranged around the circumference of the side wall of the hemispherical body 2; the inner column 8 is fixed to the center of the bottom end of the upper plate 7, and the spring 11 is fixed between the upper ring 9 and the lower ring 10, and the upper ring 9 and the lower ring 10 slide on the outside of the inner column 8; the width of the upper opening 16 is less than the thickness of the upper ring 9, and the horizontal plane at the top end of the lower opening 17 is lower than the horizontal plane at the bottom end of the chute 12;

[0032] In some embodiments, as Figure 3 、 Figure 4 and Figure 6 As shown, a limiting piece 18 is fixed to the bottom end of the upper ring 9, and a limiting groove 19 is provided at the top end of the lower ring 10. When the bottom end of the limiting piece 18 contacts the bottom end of the limiting groove 19, the top end of the upper ring 9 is located between the top and bottom ends of the upper opening 16. A closed ring 20 is fixed to the bottom end of the lower ring 10. The height of the closed ring 20 is greater than the length of the slide groove 12. The closed ring 20 and the inner column 8 are not in contact. A connecting screw hole 21 is provided at the bottom end of the cylinder 1 and the hemisphere 2. A connecting bolt 22 is connected to the inner thread of the connecting screw hole 21. A hidden groove 23 is provided at the end of the connecting screw hole 21 on the hemisphere 2. The hidden end of the connecting bolt 22 is hidden in the hidden groove 23.

[0033] In the embodiment of the present invention, when in use, the upper ring 9 and the lower ring 10 are installed in the cylinder 1 by sliding with the slider 13 and the slide groove 12, and then the upper plate 7 is fixed in the installation groove 6 to realize the installation of the anti-backflow part, and then the hemisphere 2 and the cylinder 1 are connected, and the connecting screw hole 21 is screwed and fixed by the connecting bolt 22. Finally, the cylinder 1 and the external sleeve are connected by the external thread 3. When the device is working, the external slurry is injected through the opening 14. As the slurry is injected, the upper ring 9 is subjected to pressure, the spring 11 is compressed, the upper ring 9 moves downward, and the limit piece 18 enters The slurry enters the limiting groove 19 and is positioned on the upper ring 9. When the upper opening 16 leaks out, the slurry enters the cavity 15, enters the hemispherical body 2 through the lower opening 17, and leaks out through the through hole 5. As the external casing continues to penetrate deeper, when the internal pressure is greater than the grouting pressure, the pressure on the lower ring 10 increases. Under the cooperation of the chute 12 and the slider 13, the lower ring 10 and the upper ring 9 move upward to close the upper opening 16. During the process, the closing ring 20 closes the chute 12 to prevent the slurry from entering. When the upper ring 9 contacts the bottom end of the upper plate 7, the opening 14 is closed to prevent the slurry from flowing back.

[0034] In an embodiment of the present utility model, by setting a limit plate 18 and a limit groove 19, when the upper ring 9 moves downward, the limit plate 18 enters the limit groove 19 to assist in positioning the upper ring 9; by setting a closing ring 20, the upper opening 16 is closed when the lower ring 10 and the upper ring 9 move upward, and during the process, the closing ring 20 closes the slide groove 12 to prevent slurry from entering; by setting a connecting screw hole 21, a connecting bolt 22 and a hidden groove 23, the connecting screw hole 21 is threadedly connected with the connecting bolt 22 to fix the cylinder 1 and the hemisphere 2, which facilitates the loading and unloading of the two, and the connecting bolt 22 is hidden in the hidden groove 23.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An insert-type floating hoop shoe, comprising a cylindrical body (1) and a hemispherical body (2), characterized in that: The cylinder (1) and the hemisphere (2) are connected, the top of the side wall of the cylinder (1) is provided with an external thread (3), the side wall of the cylinder (1) is fixed with a scoring strip (4), the side of the hemisphere (2) is provided with a through hole (5), the inner edge of the top of the cylinder (1) is provided with a mounting groove (6), the mounting groove (6) is provided with an anti-backflow component, the anti-backflow component includes an upper plate (7), an inner column (8), an upper ring (9), a lower ring (10) and a spring (11), a sliding groove (12) is provided on the inner wall of the cylinder (1), a slider (13) is fixed on the side walls of the upper ring (9) and the lower ring (10), the upper plate (7) is threadedly fixed in the mounting groove (6), the center of the top of the upper plate (7) is symmetrically provided with openings (14), the inner column (8) is provided with a cavity (15), and the side walls of the cavity (15) are symmetrically provided with an upper opening (16) and a lower opening (17).

2. The insertable floating hoop shoe according to claim 1, characterized in that: The eyelet strips (4) are evenly welded around the circumference and arranged at a lower middle portion of the side wall of the cylinder (1), and the through holes (5) are evenly arranged around the circumference of the side wall of the hemisphere (2).

3. The insertable floating hoop shoe according to claim 2, characterized in that: The inner column (8) is fixed at the bottom center of the upper plate (7), and the spring (11) is fixed between the upper ring (9) and the lower ring (10). The upper ring (9) and the lower ring (10) slide on the outside of the inner column (8).

4. The insertable floating hoop shoe according to claim 3, characterized in that: The width of the upper opening (16) is smaller than the thickness of the upper ring (9), and the horizontal plane at the top end of the lower opening (17) is lower than the horizontal plane at the bottom end of the chute (12).

5. The insertable floating hoop shoe according to claim 4, characterized in that: The bottom end of the upper ring (9) is fixed with a limiting piece (18), and the top end of the lower ring (10) is matched with a limiting groove (19). When the bottom end of the limiting piece (18) contacts the bottom end of the limiting groove (19), the top end of the upper ring (9) is located between the top and bottom ends of the upper opening (16).

6. The insertable floating hoop shoe according to claim 5, characterized in that: A closed ring (20) is fixed to the bottom end of the lower ring (10), the height of the closed ring (20) is greater than the length of the chute (12), and the closed ring (20) and the inner column (8) are arranged without contact.

7. The insertable floating hoop shoe according to claim 6, characterized in that: The bottom end of the cylinder (1) and the hemispherical body (2) are cooperatively provided with a connecting screw hole (21), and the connecting screw hole (21) is internally threaded with a connecting bolt (22).

8. The insertable floating hoop shoe according to claim 7, characterized in that: A hidden groove (23) is provided at the end of the connecting screw hole (21) on the hemispherical body (2), and the hidden end of the connecting bolt (22) is hidden in the hidden groove (23).

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