Filling tool suitable for small-diameter oil well

Abstract

The invention discloses a filling tool suitable for a small-diameter oil well, and relates to the technical field of oil well filling tools. Comprising a filling pipe, a downward pressing assembly is arranged in the outer side wall of the filling pipe, a plurality of stabilizing rings are arranged on the downward pressing assembly, and the filling pipe is stably located in an oil well through the stabilizing rings; a stabilizing groove is formed in the outer side face of the filling pipe, and an annularly-arranged positioning assembly is arranged in the stabilizing groove. An auxiliary assembly is arranged in the outer side wall of the filling pipe and located below the downward pressing assembly, the stability of the filling pipe in the oil well is improved through the auxiliary assembly, and the downward pressing assembly comprises a driving groove formed in the outer side wall of the filling pipe. Through cooperative use of the pressing assembly, the positioning assembly and the auxiliary assembly, fixing, stability and sealing of the filling pipe in an oil well are ensured, loosening and leakage in the filling process are avoided, and the overall performance and safety of equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of well filling tools, and specifically to a filling tool suitable for small-diameter oil wells. Background Art

[0002] Oil well filling tools are a type of tool used in the process of oil and gas extraction, especially during operations such as oil well repair, restart, shutdown, or wellhead closure. They help to seal the oil well, control the fluid flow within the oil well, and prevent external substances from entering the oil well. These tools are usually used to block different parts of the oil and gas well, such as the wellhead, oil layer, casing, etc., to ensure the safety and effectiveness of the operation.

[0003] In the prior art, a Chinese patent with the authorization announcement number CN218030156U discloses a filling tool suitable for small-diameter oil wells. By connecting the collar to the screen pipe and lowering this device into the casing according to the downhole operation procedures until reaching the designed depth; after reaching the designed depth, the valve ball is dropped into the tubing, and the valve ball seats on the valve ball sealing surface of the ball seat; by applying pressure, as the pressure increases, the first shear pin is cut off, the ball seat moves downward and contacts the seat sleeve. At this time, the inner filling hole is aligned with the outer filling hole, and the filling channel is opened for filling operation; after the filling operation is completed, continue to apply pressure to cut off the second shear pin, and the ball seat and the seat sleeve move downward together until the lower end of the seat sleeve contacts the inner step seat. At this time, the upper part of the ball seat closes the inner end of the outer filling hole, and the filling channel is closed, solving the problem that the existing filling tool is prone to incomplete closure of the filling valve and leakage of fine silt after filling.

[0004] In the above-described solution, by using the cooperation of the first shear pin and the second shear pin, the filling operation can be quickly completed without pulling and lowering the pipe string or lowering other tools. However, in this solution, since the filling pipe needs to be placed inside the oil well and the volume of the filling pipe is smaller than that of the oil well, the filling pipe is prone to offset or shake inside the oil well. If its stability cannot be maintained, it will cause uneven contact between the filling pipe and the inner wall of the oil well during the filling process, thereby affecting the filling effect and even possibly resulting in incomplete filling or equipment failure. Although some existing filling tools can install corresponding positioning mechanisms on the filling pipe, this positioning mechanism cannot make different positions of the filling pipe fit the inner wall of the oil well, so the stability of the filling pipe in the oil well cannot be ensured, and thus the filling effect of the filling pipe will be affected. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a filling tool suitable for small-diameter oil wells, solving the problems mentioned in the above background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A filling tool applicable to small-diameter oil wells, including a filling pipe. An internal pressure-down component is arranged inside the outer side wall of the filling pipe, and a plurality of stabilizing rings are arranged on the pressure-down component. The filling pipe is stably positioned inside the oil well by means of the plurality of stabilizing rings. A stabilizing groove is formed on the outer side surface of the filling pipe, and a circumferentially arranged positioning component is arranged inside the stabilizing groove. An auxiliary component is arranged inside the outer side wall of the filling pipe and below the pressure-down component to improve the stability of the filling pipe inside the oil well. The pressure-down component includes a driving groove formed inside the outer side wall of the filling pipe. An electric push rod is fixedly installed inside the driving groove. The output end of the electric push rod is fixedly installed with a pressure-down rod. The bottom end of the pressure-down rod is fixedly installed with a U-shaped rod, and an extrusion block is formed on the inner side surface of the U-shaped rod.

[0007] Preferably, an installation groove is formed inside the outer side wall of the filling pipe and below the driving groove. A limiting sliding groove is formed inside the installation groove. A limiting sliding block is slidably installed inside the limiting sliding groove. A return spring is fixedly connected to the limiting sliding block. A first receiving groove is formed on the outer side surface of the filling pipe.

[0008] Preferably, the U-shaped rod is slidably installed inside the installation groove. The first receiving groove communicates with the installation groove. The stabilizing ring is fixedly installed on the limiting sliding block. The stabilizing ring is slidably installed in the first receiving groove. The end of the return spring away from the limiting sliding block is fixedly connected inside the limiting sliding groove.

[0009] Preferably, the positioning component includes a pushing rod fixedly installed on the U-shaped rod. The bottom end of the pushing rod is fixedly installed with a pressure-down ring. A upper connecting frame is fixedly installed on the lower end surface of the pressure-down ring. An upper connecting groove is formed on the upper connecting frame. A first rotating shaft is rotatably installed inside the upper connecting groove. A driving rotating rod is fixedly installed on the first rotating shaft. A lower connecting frame is fixedly installed on the inner bottom of the stabilizing groove. A lower connecting groove is formed inside the lower connecting frame. A second rotating shaft is rotatably installed inside the lower connecting groove. A driven rotating rod is fixedly installed on the second rotating shaft.

[0010] Preferably, connecting rotating shafts are fixedly installed at the other ends of the driving rotating rod and the driven rotating rod. A stabilizing block is arranged between the driving rotating rod and the driven rotating rod. Middle connecting grooves are formed at both ends of the stabilizing block. A stabilizing arc block is fixedly installed on the side end surface of the stabilizing block.

[0011] Preferably, the driving rotating rod and the driven rotating rod are in the same vertical direction. The driving rotating rod and the driven rotating rod are both obliquely arranged. The driving rotating rod and the driven rotating rod are both rotatably installed through the connecting rotating shafts and the middle connecting grooves.

[0012] Preferably, the auxiliary component includes a centralized airbag fixedly installed at the inner bottom of the installation groove. A connecting pipe is fixedly communicated with the centralized airbag, and one end of the connecting pipe away from the centralized airbag is fixedly communicated with a squeezing airbag.

[0013] Preferably, a connecting rod is fixedly installed on the lower end surface of the U-shaped rod, and a squeezing ring is fixedly installed at the bottom end of the connecting rod. A second receiving groove is formed on the side end surface of the filling pipe.

[0014] Preferably, one end of the connecting pipe away from the centralized airbag extends into the interior of the second receiving groove. The squeezing ring is slidably installed inside the installation groove, and the squeezing ring is located above the centralized airbag. The squeezing airbag is located inside the second receiving groove.

[0015] The present invention provides a filling tool applicable to small-diameter oil wells. Compared with the prior art, it has the following beneficial effects: 1. In the present invention, after the filling pipe enters the oil well, the electric push rod drives the lower pressing rod to descend. The U-shaped rod on the lower pressing rod will move downward simultaneously through the limitation of the installation groove. The squeezing block on the U-shaped rod will squeeze and push the stabilizing ring. The stabilizing ring will be limited and slide in the limiting chute through the limiting slider, so as to extend out of the first receiving groove. By using the fitting of the stabilizing ring and the inner wall of the oil well, the filling pipe can be ensured to maintain a stable and firm position in the oil well, preventing any unnecessary movement or loosening, and ensuring the smooth progress of the filling process; 2. In the present invention, when the U-shaped rod descends, it will synchronously drive the push rod to descend. The lower pressing ring on the push rod will drive the upper connecting frame to descend. When the upper connecting frame descends, it will drive the active rotating rod to descend synchronously through the first rotating shaft. At the same time, the stabilizing block on the active rotating rod will move outward through the cooperation of the driven rotating rod and the lower connecting frame. By using the fitting of the stabilizing arc block on the stabilizing block and the inner wall of the oil well, on the basis of the stabilizing ring, the fixing of the filling pipe is further ensured; 3. In the present invention, when the U-shaped rod descends, it will drive the squeezing ring to move vertically downward in the installation groove through the connecting rod. When the squeezing ring descends, it will squeeze the centralized airbag. The gas in the centralized airbag will enter the squeezing airbag through the connecting pipe. The squeezing airbag located in the second receiving groove will expand due to the filling of gas. The expanded squeezing airbag will fit with the inner wall of the oil well, achieving the support and sealing effects on the inner wall of the oil well, and ensuring the stability and sealing performance of the filling pipe during operation; 4. In the present invention, through the combined use of the lower pressing component, the positioning component and the auxiliary component, the fixing, stability and sealing of the filling pipe in the oil well are ensured, avoiding loosening and leakage during the filling process, and improving the overall performance and safety of the equipment. Description of the Drawings

[0016] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the partial cross-sectional view of the present invention; Figure 3 is Figure 2 the enlarged view of part A in Figure 4 is the structural schematic diagram of the stabilizing groove in the present invention; Figure 5 is the structural schematic diagram of the pressing-down assembly in the present invention; Figure 6 is the structural schematic diagram of the U-shaped rod in the present invention; Figure 7 is the structural schematic diagram of the positioning assembly in the present invention; Figure 8 is the structural schematic diagram of the auxiliary assembly in the present invention; Figure 9 is the cross-sectional view of the stabilizing block in the present invention.

[0017] In the figure: 1, filling pipe; 2, stabilizing ring; 3, stabilizing groove; 4, driving groove; 5, electric push rod; 6, pressing-down rod; 7, U-shaped rod; 8, extrusion block; 9, installation groove; 10, limiting sliding groove; 11, limiting sliding block; 12, reset spring; 13, first storage groove; 14, pushing rod; 15, pressing-down ring; 16, upper connecting frame; 17, upper connecting groove; 18, first rotating shaft; 19, active rotating rod; 20, lower connecting frame; 21, lower connecting groove; 22, second rotating shaft; 23, driven rotating rod; 24, connecting rotating shaft; 25, stabilizing block; 26, middle connecting groove; 27, stabilizing arc block; 28, concentrated airbag; 29, communicating pipe; 30, extrusion airbag; 31, connecting rod; 32, extrusion ring; 33, second storage groove. Detailed implementation manners

[0018] 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. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 9 , the present invention is a filling tool applicable to small-diameter oil wells, including a filling pipe 1. An internal pressing-down assembly is provided inside the outer side wall of the filling pipe 1, and a plurality of stabilizing rings 2 are arranged on the pressing-down assembly. The filling pipe 1 is stably located inside the oil well by using the plurality of stabilizing rings 2. An outer filling port is opened on the filling pipe 1. Since this technology is well-known to those skilled in the art, no specific elaboration will be made here; The pressing-down assembly includes a driving groove 4 formed inside the outer sidewall of the filling pipe 1. An electric push rod 5 is fixedly installed inside the driving groove 4. The output end of the electric push rod 5 is fixedly installed with a pressing-down rod 6. The bottom end of the pressing-down rod 6 is fixedly installed with a U-shaped rod 7. An extrusion block 8 is formed on the inner side surface of the U-shaped rod 7. An installation groove 9 is formed inside the outer sidewall of the filling pipe 1 and below the driving groove 4. A limiting sliding groove 10 is formed inside the installation groove 9. A limiting sliding block 11 is slidably installed inside the limiting sliding groove 10. A reset spring 12 is fixedly connected to the limiting sliding block 11. A first storage groove 13 is formed on the outer side surface of the filling pipe 1. The U-shaped rod 7 is slidably installed inside the installation groove 9. The first storage groove 13 communicates with the installation groove 9. A stabilizing ring 2 is fixedly installed on the limiting sliding block 11. The stabilizing ring 2 is slidably installed with the first storage groove 13. One end of the reset spring 12 away from the limiting sliding block 11 is fixedly connected inside the limiting sliding groove 10. When the electric push rod 5 drives the pressing-down rod 6 to rise, the extrusion block 8 on the U-shaped rod 7 will not continue to squeeze and push the stabilizing ring 2. The stabilizing ring 2 will return to its original position through the reaction force of the reset spring 12. By using the limiting sliding of the limiting sliding block 11 in the limiting sliding groove 10, it is ensured that when the stabilizing ring 2 slides inside the first storage groove 13, it will not fall off.

[0020] In this embodiment, after the filling pipe 1 enters the oil well, the electric push rod 5 drives the pressing-down rod 6 to descend. The U-shaped rod 7 on the pressing-down rod 6 will move downward simultaneously through the limitation of the installation groove 9. The extrusion block 8 on the U-shaped rod 7 will squeeze and push the stabilizing ring 2. The stabilizing ring 2 will slide out of the first storage groove 13 through the limiting sliding of the limiting sliding block 11 in the limiting sliding groove 10. By using the fitting of the stabilizing ring 2 with the inner wall of the oil well, it is ensured that the filling pipe 1 maintains a stable and firm position in the oil well, preventing any unnecessary movement or loosening and ensuring the smooth progress of the filling process.

[0021] A stabilizing groove 3 is formed on the outer side surface of the filling pipe 1, and a positioning assembly arranged in a ring shape is provided inside the stabilizing groove 3. The positioning assembly includes a push rod 14 fixedly installed on a U-shaped rod 7. A pressing ring 15 is fixedly installed at the bottom end of the push rod 14. An upper connecting frame 16 is fixedly installed on the lower end surface of the pressing ring 15. An upper connecting groove 17 is formed on the upper connecting frame 16. A first rotating shaft 18 is rotatably installed inside the upper connecting groove 17. A driving rotating rod 19 is fixedly installed on the first rotating shaft 18. A lower connecting frame 20 is fixedly installed at the inner bottom of the stabilizing groove 3. A lower connecting groove 21 is formed inside the lower connecting frame 20. A second rotating shaft 22 is rotatably installed inside the lower connecting groove 21. A driven rotating rod 23 is fixedly installed on the second rotating shaft 22. Connecting rotating shafts 24 are fixedly installed at the other ends of the driving rotating rod 19 and the driven rotating rod 23. A stabilizing block 25 is arranged between the driving rotating rod 19 and the driven rotating rod 23. Middle connecting grooves 26 are formed at both ends of the stabilizing block 25. A stabilizing arc block 27 is fixedly installed on the side end surface of the stabilizing block 25. The driving rotating rod 19 and the driven rotating rod 23 are in the same vertical direction. Both the driving rotating rod 19 and the driven rotating rod 23 are arranged obliquely. The driving rotating rod 19 and the driven rotating rod 23 are rotatably installed in the middle connecting grooves 26 through the connecting rotating shafts 24. Among them, the pressing ring 15 is slidably installed on the surface of the filling pipe 1 to ensure that the pressing ring 15 is in a stable state when ascending and descending.

[0022] In this embodiment, when the U-shaped rod 7 descends, it will synchronously drive the push rod 14 to descend synchronously. The pressing ring 15 on the push rod 14 will drive the upper connecting frame 16 to descend. When the upper connecting frame 16 descends, it will drive the driving rotating rod 19 to descend synchronously through the first rotating shaft 18. At the same time, the stabilizing block 25 on the driving rotating rod 19 will move outward through the cooperation of the driven rotating rod 23 and the lower connecting frame 20. By the fitting of the stabilizing arc block 27 on the stabilizing block 25 with the inner wall of the oil well, on the basis of the stabilizing ring 2, the fixing of the filling pipe 1 is further ensured.

[0023] An auxiliary component is arranged inside the outer side wall of the filling pipe 1 and below the pressing component. The stability of the filling pipe 1 in the oil well is improved through the auxiliary component. The auxiliary component includes a centralized airbag 28 fixedly installed at the bottom of the installation groove 9. A connecting pipe 29 is fixedly communicated with the centralized airbag 28. One end of the connecting pipe 29 far from the centralized airbag 28 is fixedly communicated with a squeezing airbag 30. A connecting rod 31 is fixedly installed on the lower end surface of the U-shaped rod 7. The bottom end of the connecting rod 31 is fixedly installed with a squeezing ring 32. A second receiving groove 33 is formed in the side end surface of the filling pipe 1. One end of the connecting pipe 29 far from the centralized airbag 28 extends into the inside of the second receiving groove 33. The squeezing ring 32 is slidably installed inside the installation groove 9, and the squeezing ring 32 is above the centralized airbag 28. The squeezing airbag 30 is inside the second receiving groove 33. The shape of the second receiving groove 33 is annular, ensuring that the annular squeezing airbag 30 can be received by the second receiving groove 33.

[0024] In this embodiment, when the U-shaped rod 7 descends, it will drive the squeezing ring 32 to move vertically downward in the installation groove 9 through the connecting rod 31. When the squeezing ring 32 descends, it will squeeze the centralized airbag 28. The gas in the centralized airbag 28 will enter the squeezing airbag 30 through the connecting pipe 29. The squeezing airbag 30 in the second receiving groove 33 will expand due to the inflation of the gas. The inflated squeezing airbag 30 will fit against the inner wall of the oil well, achieving the support and sealing effects on the inner wall of the oil well, ensuring the stability and sealing performance of the filling pipe 1 during operation.

[0025] Working principle: When in use, after the filling pipe 1 enters the oil well, the electric push rod 5 drives the pressing rod 6 to descend. The U-shaped rod 7 on the pressing rod 6 will move downward simultaneously through the limitation of the installation groove 9. The squeezing block 8 on the U-shaped rod 7 will squeeze and push the stabilizing ring 2. The stabilizing ring 2 will slide in the limiting sliding groove 10 through the limiting slider 11, and thus extend out of the first receiving groove 13. By using the fitting of the stabilizing ring 2 with the inner wall of the oil well, the filling pipe 1 is ensured to maintain a stable and firm position in the oil well. When the U-shaped rod 7 descends, it will synchronously drive the push rod 14 to descend. The pressing ring 15 on the push rod 14 will drive the upper connecting frame 16 to descend. When the upper connecting frame 16 descends, it will drive the active rotating rod 19 to descend synchronously through the first rotating shaft 18. At the same time, the stabilizing block 25 on the active rotating rod 19 will move outward through the cooperation of the driven rotating rod 23 and the lower connecting frame 20. Through the fitting of the stabilizing arc block 27 on the stabilizing block 25 with the inner wall of the oil well, on the basis of the stabilizing ring 2, the fixing of the filling pipe 1 is further ensured. When the U-shaped rod 7 descends, it will drive the extrusion ring 32 to move vertically downward in the installation groove 9 through the connecting rod 31. During the descent of the extrusion ring 32, it will squeeze the concentrated airbag 28, and the gas in the concentrated airbag 28 will enter the extrusion airbag 30 through the connecting pipe 29. The extrusion airbag 30 in the second storage groove 33 will expand due to the inflation of the gas. The inflated extrusion airbag 30 will fit against the inner wall of the oil well, achieving the support and sealing effects on the inner wall of the oil well, and ensuring the stability and sealing performance of the filling pipe 1 during operation.

[0026] In this technical solution, the pressing rod 6, the U-shaped rod 7 and the pushing rod 14 are integrally cast, and the extrusion airbag 30 is made of polyamide fabric with very good anti-cracking performance, ensuring that when the inner wall of the oil well fits against the extrusion airbag 30 after the extrusion airbag 30 expands, the inner wall of the oil well will not cause damage to the extrusion airbag 30.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A packing tool applicable to small-diameter oil wells, comprising a packing tube (1), characterized in that: An internal pressure-down component is provided inside the outer sidewall of the filling pipe (1), and a plurality of stabilizing rings (2) are arranged on the pressure-down component, and the filling pipe (1) is stably positioned inside the oil well by means of the plurality of stabilizing rings (2). A stabilizing groove (3) is formed on the outer side surface of the filling pipe (1), and a circumferentially arranged positioning component is provided inside the stabilizing groove (3). An auxiliary component is provided inside the outer sidewall of the filling pipe (1) and below the pressure-down component, and the stability of the filling pipe (1) inside the oil well is improved by means of the auxiliary component. The pressure-down component includes a driving groove (4) formed inside the outer sidewall of the filling pipe (1), an electric push rod (5) is fixedly installed inside the driving groove (4), a pressure-down rod (6) is fixedly installed at the output end of the electric push rod (5), a U-shaped rod (7) is fixedly installed at the bottom end of the pressure-down rod (6), and a pressing block (8) is formed on the inner side surface of the U-shaped rod (7).

2. The packing tool applicable to small-diameter oil wells according to claim 1, wherein: An installation groove (9) is formed inside the outer sidewall of the filling pipe (1) and below the driving groove (4), a limiting sliding groove (10) is formed inside the installation groove (9), a limiting sliding block (11) is slidably installed inside the limiting sliding groove (10), a return spring (12) is fixedly connected to the limiting sliding block (11), and a first receiving groove (13) is formed on the outer side surface of the filling pipe (1).

3. The packing tool applicable to small-diameter oil wells according to claim 2, characterized in that: The U-shaped rod (7) is slidably installed inside the installation groove (9), the first receiving groove (13) communicates with the installation groove (9), the stabilizing ring (2) is fixedly installed on the limiting sliding block (11), the stabilizing ring (2) is slidably installed with the first receiving groove (13), and one end of the return spring (12) away from the limiting sliding block (11) is fixedly connected inside the limiting sliding groove (10).

4. The packing tool applicable to small-diameter oil wells according to claim 2, characterized in that: The positioning component includes a pushing rod (14) fixedly installed on the U-shaped rod (7), a pressing ring (15) is fixedly installed at the bottom end of the pushing rod (14), an upper connecting frame (16) is fixedly installed on the lower end surface of the pressing ring (15), an upper connecting groove (17) is formed on the upper connecting frame (16), a first rotating shaft (18) is rotatably installed inside the upper connecting groove (17), a driving rotating rod (19) is fixedly installed on the first rotating shaft (18), a lower connecting frame (20) is fixedly installed on the inner bottom of the stabilizing groove (3), a lower connecting groove (21) is formed inside the lower connecting frame (20), a second rotating shaft (22) is rotatably installed inside the lower connecting groove (21), and a driven rotating rod (23) is fixedly installed on the second rotating shaft (22).

5. The packing tool applicable to small-diameter oil wells according to claim 4, characterized in that: Connecting rotating shafts (24) are fixedly installed at the other ends of the driving rotating rod (19) and the driven rotating rod (23), a stabilizing block (25) is arranged between the driving rotating rod (19) and the driven rotating rod (23), middle connecting grooves (26) are formed at both ends of the stabilizing block (25), and a stabilizing arc block (27) is fixedly installed on the side end surface of the stabilizing block (25).

6. The packing tool applicable to small-diameter oil wells according to claim 5, wherein: The active rotating rod (19) and the driven rotating rod (23) are in the same vertical direction. Both the active rotating rod (19) and the driven rotating rod (23) are arranged obliquely, and both the active rotating rod (19) and the driven rotating rod (23) are rotatably installed in the middle connecting groove (26) through the connecting rotating shaft (24).

7. The packing tool applicable to small-diameter oil wells according to claim 4, wherein: The auxiliary component includes a centralized airbag (28) fixedly installed at the inner bottom of the installation groove (9). A communicating pipe (29) is fixedly communicated with the centralized airbag (28), and one end of the communicating pipe (29) far away from the centralized airbag (28) is fixedly communicated with a squeezing airbag (30).

8. The packing tool applicable to small-diameter oil wells according to claim 7, wherein: A connecting rod (31) is fixedly installed on the lower end surface of the U-shaped rod (7), and a squeezing ring (32) is fixedly installed at the bottom end of the connecting rod (31). A second storage groove (33) is formed on the side end surface of the filling pipe (1).

9. The packing tool applicable to small-diameter oil wells according to claim 8, wherein: One end of the communicating pipe (29) far away from the centralized airbag (28) extends into the interior of the second storage groove (33). The squeezing ring (32) is slidably installed in the interior of the installation groove (9), and the squeezing ring (32) is located above the centralized airbag (28). The squeezing airbag (30) is located in the interior of the second storage groove (33).

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