A cementing tool for enhancing cementing quality of cementing annular interface

Abstract

The utility model provides a cementing tool for enhancing cementing quality of cement ring interface, include: sealing tool main part, upper joint casing, lower joint casing and space grid structure, the outside of sealing tool main part is provided with a plurality of reinforcing ribs, a plurality of reinforcing ribs around sealing tool main part evenly arranged, the outside of sealing tool main part, upper joint casing and lower joint casing is used to with the outer sleeve or formation around form forming space, space grid structure sets up on a plurality of reinforcing ribs, is located in forming space. Relative to the prior art, the utility model discloses a cementing tool for enhancing cementing quality of cement ring interface, through space grid structure and to the surface treatment of reinforcing strip, effectively enhances the cementing strength of casing and annular cement ring, and simultaneously through the space grid structure formed by reinforcing strip and annular cement ring combination, enhances the tensile strength of annular cement ring, thereby increases the ability of annular cement ring to resist interface and the tensile failure of body, effectively promotes cementing cementing quality.

Description

Technical Field

[0001] This utility model relates to the field of well cementing technology, specifically to a cementing tool for enhancing the bonding quality of the cement sheath interface. Background Technology

[0002] Existing technologies for improving cementing interfaces mainly include interface-enhanced cement slurry technology, drilling and completion fluid solidification technology, high-performance flushing fluid technology, and casing surface treatment technology.

[0003] Interface-enhanced cement slurry technology adds highly active materials to the cement slurry, giving the hydration products of the cement slurry higher strength. By enhancing the strength of the cement slurry, it indirectly improves the bonding strength of the cement ring interface.

[0004] High-performance flushing fluid technology mainly includes technologies for improving interface scouring efficiency and wetting reversal. The interface scouring efficiency improvement technology involves adding prismatic particulate materials to the flushing fluid, creating a two-phase flow state within the annulus. Increasing the flow rate further intensifies this flow, allowing the prismatic particulate materials to effectively flush away the drilling fluid and filter cake adhering to the annulus wall. The wetting reversal technology, specifically for wellbore drilling with oil-based drilling fluids, adds wetting and reversal materials to the flushing fluid, making the annulus interface hydrophilic after flushing. Under these two methods, when the cement slurry comes into contact with the flushed annulus wall, the hydration products of the cement slurry bond better to the annulus wall, effectively improving the bonding strength between the solidified hydration ring and the annulus interface.

[0005] Drilling and completion fluid solidification technology mainly involves adding active and activating materials to the drilling fluid. During drilling, the filter cake formed by the drilling fluid on the annulus wall will, under the action of the activating and activating materials, form a structure with a certain strength, generally reaching 1 MPa, which is higher than the strength of conventional filter cakes (generally 0.1 MPa). After drilling is completed, the interfacial strength between the cement slurry and the solidified filter cake can also remain at a high level, thereby achieving the goal of improving the interfacial bonding strength.

[0006] Casing surface treatment technology mainly involves processing the outer wall of the casing into irregular shapes such as waves or serrations, or increasing the surface roughness of the casing. Compared with the outer wall of conventional casing, the surface area or friction coefficient of the outer wall is increased. Therefore, after cementing, the bonding force between the cement slurry and the irregular casing is higher than that of conventional casing.

[0007] Due to the significant difference in mechanical properties between the annular cement sheath (strength 20-40 MPa) and the casing metal material (strength 500-1000 MPa), a weak interfacial layer (generally less than 1 mm thick) forms at the interface after the cement slurry solidifies into an annular cement sheath. Simultaneously, the contact area between the cement sheath and the annular wall is small, resulting in low interfacial bonding strength after cement slurry solidification. High-performance cement slurry technology, efficient flushing fluid technology, and drilling and completion fluid solidification technology can only slightly increase the interfacial bonding strength, failing to significantly improve it. For casing surface treatment technology, the increase in casing surface area is limited, also unable to significantly improve the interfacial bonding strength between the cement sheath and the casing. Therefore, in summary, the effects of existing technologies such as high-performance cement slurry technology, efficient flushing fluid technology, drilling and completion fluid solidification technology, and casing surface treatment technology on improving interfacial bonding strength are very limited and insufficient to meet the requirements. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings and deficiencies in the existing technology and to provide a cementing tool for enhancing the bonding quality of the cement sheath interface.

[0009] One embodiment of this utility model provides a cementing tool for enhancing the bonding quality of the cement sheath interface, comprising: A sealing tool body, wherein multiple reinforcing ribs are provided on the outer side of the sealing tool body, and the multiple reinforcing ribs are evenly arranged around the sealing tool body; An upper connecting sleeve is disposed at the top of the sealing tool body; The lower connecting sleeve is disposed at the bottom of the sealing tool body. The outer sides of the sealing tool body, the upper connecting sleeve, and the lower connecting sleeve are used to form a forming space around the outer sleeve or the formation. The forming space is used for forming an annular cement ring. A spatial grid structure is provided on a plurality of the reinforcing ribs and is located in the forming space.

[0010] In some optional embodiments, the space frame structure includes multiple radial reinforcing bars, multiple axial reinforcing bars, and multiple circumferential reinforcing bars. The multiple radial reinforcing bars are disposed on each of the reinforcing ribs. The multiple radial reinforcing bars on the same reinforcing rib are arranged sequentially along the axial direction of the forming space. The axial reinforcing bars are connected to the multiple radial reinforcing bars on the same reinforcing rib. The circumferential reinforcing bars are arranged around the radial reinforcing bars and are connected to the radial reinforcing bars on each of the reinforcing ribs.

[0011] In some alternative embodiments, the length of the radial reinforcing strip is 1 / 4 to 1 / 3 of the thickness of the molding space in the radial direction.

[0012] In some alternative embodiments, a retaining ring is provided on the outer side of the sealing tool body, the retaining ring being arranged around a plurality of the reinforcing ribs, and the inner side of the retaining ring abutting against the side of the reinforcing ribs away from the sealing tool body.

[0013] In some alternative embodiments, the retaining ring is provided with a plurality of locking bolts that pass through the retaining ring and press the reinforcing rib against the outside of the sealing tool body.

[0014] In some alternative embodiments, the reinforcing rib is provided with a fixing groove, and the locking bolt extends into the fixing groove accordingly.

[0015] In some alternative embodiments, limiting grooves are provided at both the top and bottom of the reinforcing rib; The outer side of the sealing tool body is provided with multiple upper limit protrusions and multiple lower limit protrusions. The multiple upper limit protrusions are arranged around the sealing tool body and are matched with the limiting groove at the top of the reinforcing rib. The multiple lower limit protrusions are arranged around the sealing tool body and are matched with the limiting groove at the bottom of the reinforcing rib.

[0016] In some optional embodiments, the top and bottom of the sealing tool body are respectively provided with an upper tube buckle and a lower tube buckle, the upper connecting sleeve is detachably connected to the sealing tool body through the upper tube buckle, and the lower connecting sleeve is detachably connected to the sealing tool body through the lower tube buckle.

[0017] In some alternative embodiments, an upper locking ring and a lower locking ring are fitted on the outer side of the sealing tool body, and the side of the reinforcing rib is provided with an upper inclined thread portion and a lower inclined thread portion. The upper locking ring is threadedly engaged with the upper inclined thread portions of the plurality of reinforcing ribs, and the lower locking ring is threadedly engaged with the lower inclined thread portions of the plurality of reinforcing ribs.

[0018] In some optional embodiments, both the upper and lower locking rings are provided with through holes, each through hole comprising a small-diameter section, a variable-diameter section, and a large-diameter section connected in sequence. The variable-diameter section gradually widens in the direction from the small-diameter section to the large-diameter section. The top of the reinforcing rib extends into the variable-diameter section and the large-diameter section on the upper locking ring, and the variable-diameter section and the large-diameter section on the upper locking ring are threadedly engaged with the upper inclined threaded portion. The bottom of the reinforcing rib extends into the variable-diameter section and the large-diameter section on the lower locking ring, and the variable-diameter section and the large-diameter section on the lower locking ring are threadedly engaged with the lower inclined threaded portion.

[0019] Compared to existing technologies, this invention, a cementing tool for enhancing the bonding quality of the cement sheath interface, effectively strengthens the bonding strength between the casing and the annular cement sheath through a spatial grid structure and surface treatment of the reinforcing strips. Simultaneously, the spatial grid structure formed by the reinforcing strips, combined with the annular cement sheath, enhances the tensile strength of the annular cement sheath, thereby increasing its resistance to interfacial and body tensile failure and effectively improving the cementing bonding quality. Furthermore, the fastening design of the fixing ring, upper locking ring, and lower locking ring ensures a tight fit between the reinforcing ribs and the outer wall of the sealing tool body, which is beneficial for improving sealing performance.

[0020] To provide a clearer understanding of this invention, the specific embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a first cross-sectional view of a cementing tool for enhancing the bonding quality of the cement sheath interface according to an embodiment of the present invention. Figure 2 This is a cross-sectional view of the sealing tool body and the space frame structure according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a cementing tool and annular cement sheath for enhancing the bonding quality of the cement sheath interface according to an embodiment of the present invention. Figure 4 This is a second cross-sectional view of a cementing tool for enhancing the bonding quality of the cement sheath interface according to an embodiment of the present invention; Figure 5 This is a third cross-sectional view of a cementing tool for enhancing the bonding quality of the cement sheath interface according to an embodiment of the present invention. Figure 6 This is a cross-sectional view of the upper locking ring according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 10. Sealing tool body; 11. Reinforcing rib; 111. Fixing groove; 112. Limiting groove; 12. Fixing ring; 121. Locking bolt; 13. Upper limit protrusion; 14. Upper tube buckle; 15. Lower tube buckle; 16. Upper locking ring; 161. Through hole; 162. Small diameter section; 163. Variable diameter section; 164. Large diameter section; 17. Lower locking ring; 20. Upper connecting sleeve; 30. Lower connecting sleeve; 40. Spatial grid structure; 41. Radial reinforcing strip; 42. Axial reinforcing strip; 43. Circumferential reinforcing strip; 50. Forming space; 60. Outer sleeve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] Please see Figures 1 to 3 This invention provides a cementing tool for enhancing the bonding quality of the cement sheath interface, comprising: The sealing tool body 10 has multiple reinforcing ribs 11 on its outer side, and the multiple reinforcing ribs 11 are evenly arranged around the sealing tool body 10. The upper connecting sleeve 20 is located on the top of the sealing tool body 10; The lower sleeve 30 and the upper sleeve 20 are located at the bottom of the sealing tool body 10. The outer sides of the sealing tool body 10, the upper sleeve 20 and the lower sleeve 30 are used to form a forming space 50 around the outer sleeve 60 or the formation. The forming space 50 is used to form an annular cement ring. The space frame structure 40 is disposed on multiple reinforcing ribs 11 and is located in the forming space 50.

[0028] The working principle of a cementing tool for enhancing the bonding quality of the cement sheath interface according to one embodiment of the present invention is described below: After drilling, cementing tools used to enhance the bonding quality of the cement sheath interface are inserted into the wellbore. The outer sides of the sealing tool body 10, the upper casing 20, and the lower casing 30 surround the formation inner wall of the wellbore to form a forming space 50. Alternatively, an outer casing 60 can be inserted into the wellbore so that the outer sides of the sealing tool body 10, the upper casing 20, and the lower casing 30, together with the outer casing 60, form the forming space 50.

[0029] Then, cement slurry is injected into the molding space 50. The space frame structure 40 will be inside the cement slurry. After the cement slurry solidifies and forms an annular cement ring, the annular cement ring will solidify together with the space frame structure 40 into a whole. This improves the bonding quality of the interface between the upper sleeve 20, the lower sleeve 30, the sealing tool body 10, and the annular cement ring. At the same time, the space frame structure 40 can improve the stress state of the cement ring and enhance the structural safety of the annular cement ring when the temperature and pressure conditions change in the later stage.

[0030] The specific structure of the space frame structure 40 can be designed according to actual needs. For example, in some optional embodiments, the space frame structure 40 includes multiple radial reinforcing bars 41, multiple axial reinforcing bars 42, and multiple circumferential reinforcing bars 43. The multiple radial reinforcing bars 41 are disposed on each reinforcing rib 11. The multiple radial reinforcing bars 41 on the same reinforcing rib 11 are arranged sequentially along the axial direction of the forming space 50. The axial reinforcing bars 42 are connected to the multiple radial reinforcing bars 41 on the same reinforcing rib 11. The circumferential reinforcing bars 43 are arranged around the radial reinforcing bars 41 and are connected to the radial reinforcing bars 41 on each reinforcing rib 11. The radial reinforcing bars 41, axial reinforcing bars 42, and circumferential reinforcing bars 43 can all be thin cylindrical reinforcing bars with a diameter ranging from 1 to 2 mm. Radial reinforcing bars 41, axial reinforcing bars 42, and circumferential reinforcing bars 43 can be pre-treated with alkali, followed by surface treatment with a silane coupling agent. This significantly improves the bonding strength between the space frame structure 40 and the annular cement ring, and also results in superior material properties for the reinforcing bars, enabling them to withstand the effects of various corrosive media and ensuring structural stability under high temperature and high pressure environments. Multiple radial reinforcing bars 41, multiple axial reinforcing bars 42, and multiple circumferential reinforcing bars 43 can be integrally formed by welding.

[0031] In some alternative embodiments, the length of the radial reinforcing strip 41 is 1 / 4 to 1 / 3 of the thickness of the molding space 50 in the radial direction, so that the radial reinforcing strip 41 can extend into the annular cement ring by a sufficient distance, while the axial reinforcing strip 42 and the circumferential reinforcing strip 43 are arranged at the ends of the radial reinforcing strip 41, so that the axial reinforcing strip 42 and the circumferential reinforcing strip 43 can be arranged in a reasonable position inside the annular cement ring.

[0032] Please see Figure 4 In some alternative embodiments, a retaining ring 12 is provided on the outer side of the sealing tool body 10. The retaining ring 12 is arranged around a plurality of reinforcing ribs 11. The inner side of the retaining ring 12 abuts against the side of the reinforcing ribs 11 away from the sealing tool body 10, and the position of the reinforcing ribs 11 is stably locked and restricted by the retaining ring 12.

[0033] In some alternative embodiments, the retaining ring 12 is provided with a plurality of locking bolts 121. The locking bolts 121 pass through the retaining ring 12 and press the reinforcing ribs 11 against the outside of the sealing tool body 10. The locking bolts 121 press the reinforcing ribs 11 against the outside of the sealing tool body 10, thereby stably locking the reinforcing ribs 11. In this embodiment, the number of locking bolts 121 corresponds to the number of reinforcing ribs 11, so that each reinforcing rib 11 can be stably locked.

[0034] In some alternative embodiments, the reinforcing rib 11 is provided with a fixing groove 111, and the locking bolt 121 extends into the fixing groove 111 accordingly. The fixing groove 111 restricts the position of the end of the locking bolt 121, thereby preventing the locking bolt 121 from shifting position and making the locking force applied to the end of the locking bolt 121 more stable.

[0035] In some optional embodiments, limiting grooves 112 are provided at both the top and bottom of the reinforcing rib 11; multiple upper limit protrusions 13 and multiple lower limit protrusions are provided on the outer side of the sealing tool body 10. The multiple upper limit protrusions 13 are arranged around the sealing tool body 10, and the upper limit protrusions 13 are corresponding to the limiting grooves 112 at the top of the reinforcing rib 11 for limiting engagement. The multiple lower limit protrusions are arranged around the sealing tool body 10, and the lower limit protrusions are corresponding to the limiting grooves 112 at the bottom of the reinforcing rib 11 for limiting engagement. Through the engagement of the upper limit protrusions 13 and the limiting grooves 112, as well as the engagement of the lower limit protrusions and the limiting grooves 112, the reinforcing rib 11 is prevented from shifting its position along the axial direction of the molding space 50, thereby improving the stability of the reinforcing rib 11. The engagement method of the lower limit protrusions and the limiting grooves 112 can refer to the engagement method of the upper limit protrusions 13 and the limiting grooves 112.

[0036] The detachable connection between the sealing tool body 10 and the lower sleeve 30 and upper sleeve 20 can be designed according to actual needs. For example, in some optional embodiments, the top and bottom of the sealing tool body 10 are respectively provided with an upper tube buckle 14 and a lower tube buckle 15. The upper sleeve 20 is detachably connected to the sealing tool body 10 through the upper tube buckle 14, and the lower sleeve 30 is detachably connected to the sealing tool body 10 through the lower tube buckle 15, thereby facilitating the connection between the sealing tool body 10 and the lower sleeve 30 and upper sleeve 20. Of course, the sealing tool body 10 can also be detachably connected to the lower sleeve 30 and upper sleeve 20 through a threaded structure.

[0037] Please see Figure 5 In some optional embodiments, an upper locking ring 16 and a lower locking ring 17 are sleeved on the outer side of the sealing tool body 10. The side of the reinforcing rib 11 is provided with an upper inclined thread portion and a lower inclined thread portion. The upper locking ring 16 is threadedly engaged with the upper inclined thread portion of the plurality of reinforcing ribs 11, and the lower locking ring 17 is threadedly engaged with the lower inclined thread portion of the plurality of reinforcing ribs 11. The upper locking ring 16 locks the area near the top of the reinforcing rib 11, so that the upper locking ring 16 presses the reinforcing rib 11 against the outer side of the sealing tool body 10. The lower locking ring 17 locks the area near the bottom of the reinforcing rib 11, so that the lower locking ring 17 presses the reinforcing rib 11 against the outer side of the sealing tool body 10.

[0038] Please see Figure 6In some optional embodiments, both the upper locking ring 16 and the lower locking ring 17 are provided with through holes 161. The through holes 161 include a small-diameter section 162, a variable-diameter section 163, and a large-diameter section 164 connected in sequence. The variable-diameter section 163 gradually widens in the direction from the small-diameter section 162 to the large-diameter section 164. The top of the reinforcing rib 11 extends into the variable-diameter section 163 and the large-diameter section 164 on the upper locking ring 16. The variable-diameter section 163 and the large-diameter section 164 on the upper locking ring 16 are threadedly engaged with the upper inclined threaded portion. When the reinforcing rib 11 enters the variable-diameter section 163 on the upper locking ring 16, due to the variable-diameter section 162... The reinforcing rib 11 gradually contracts towards the small diameter section 162, thereby using the upper locking ring 16 to stably press the reinforcing rib 11 against the outside of the sealing tool body 10. The bottom of the reinforcing rib 11 extends into the variable diameter section 163 and the large diameter section 164 on the lower locking ring 17. The variable diameter section 163 and the large diameter section 164 on the lower locking ring 17 are threadedly engaged with the downward inclined threaded portion. When the reinforcing rib 11 enters the variable diameter section 163 on the lower locking ring 17, the variable diameter section 163 gradually contracts towards the small diameter section 162, thereby using the lower locking ring 17 to stably press the reinforcing rib 11 against the outside of the sealing tool body 10.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cementing tool for enhancing the bonding quality of the cement sheath interface, characterized in that, include: A sealing tool body, wherein multiple reinforcing ribs are provided on the outer side of the sealing tool body, and the multiple reinforcing ribs are evenly arranged around the sealing tool body; An upper connecting sleeve is disposed at the top of the sealing tool body; The lower connecting sleeve is disposed at the bottom of the sealing tool body. The outer sides of the sealing tool body, the upper connecting sleeve, and the lower connecting sleeve are used to form a forming space around the outer sleeve or the formation. The forming space is used for forming an annular cement ring. A spatial grid structure is provided on a plurality of the reinforcing ribs and is located in the forming space.

2. A cementing tool for enhancing the bonding quality of the cement sheath interface according to claim 1, characterized in that: The space frame structure includes multiple radial reinforcing bars, multiple axial reinforcing bars, and multiple circumferential reinforcing bars. The multiple radial reinforcing bars are disposed on each of the reinforcing ribs. The multiple radial reinforcing bars on the same reinforcing rib are arranged sequentially along the axial direction of the forming space. The axial reinforcing bars are connected to the multiple radial reinforcing bars on the same reinforcing rib. The circumferential reinforcing bars are arranged around the radial reinforcing bars and are connected to the radial reinforcing bars on each of the reinforcing ribs.

3. A cementing tool for enhancing the bonding quality of the cement sheath interface according to claim 2, characterized in that: The length of the radial reinforcing strip is 1 / 4 to 1 / 3 of the thickness of the molding space in the radial direction.

4. A cementing tool for enhancing the bonding quality of the cement sheath interface according to claim 1, characterized in that: A retaining ring is provided on the outer side of the sealing tool body. The retaining ring is arranged around a plurality of the reinforcing ribs, and the inner side of the retaining ring abuts against the side of the reinforcing ribs away from the sealing tool body.

5. A cementing tool for enhancing the bonding quality of the cement sheath interface according to claim 4, characterized in that: The fixing ring is provided with a plurality of locking bolts, which pass through the fixing ring and then press the reinforcing rib against the outside of the sealing tool body.

6. A cementing tool for enhancing the bonding quality of the cement sheath interface according to claim 5, characterized in that: The reinforcing rib is provided with a fixing groove, and the locking bolt extends into the fixing groove accordingly.

7. A cementing tool for enhancing the bonding quality of the cement sheath interface according to any one of claims 1 to 6, characterized in that: The top and bottom of the reinforcing rib are provided with limiting grooves; The outer side of the sealing tool body is provided with multiple upper limit protrusions and multiple lower limit protrusions. The multiple upper limit protrusions are arranged around the sealing tool body and are matched with the limiting groove at the top of the reinforcing rib. The multiple lower limit protrusions are arranged around the sealing tool body and are matched with the limiting groove at the bottom of the reinforcing rib.

8. A cementing tool for enhancing the bonding quality of the cement sheath interface according to any one of claims 1 to 6, characterized in that... : The top and bottom of the sealing tool body are respectively provided with an upper tube buckle and a lower tube buckle. The upper connecting sleeve is detachably connected to the sealing tool body through the upper tube buckle, and the lower connecting sleeve is detachably connected to the sealing tool body through the lower tube buckle.

9. A cementing tool for enhancing the bonding quality of the cement sheath interface according to any one of claims 1 to 6, characterized in that: The outer side of the sealing tool body is fitted with an upper locking ring and a lower locking ring. The side of the reinforcing rib is provided with an upper inclined thread and a lower inclined thread. The upper locking ring is threadedly engaged with the upper inclined thread of the multiple reinforcing ribs, and the lower locking ring is threadedly engaged with the lower inclined thread of the multiple reinforcing ribs.

10. A cementing tool for enhancing the bonding quality of the cement sheath interface according to claim 9, characterized in that: Both the upper and lower locking rings are provided with through holes, each through hole comprising a small diameter section, a variable diameter section, and a large diameter section connected in sequence. The variable diameter section gradually widens from the small diameter section to the large diameter section. The top of the reinforcing rib extends into the variable diameter section and the large diameter section on the upper locking ring, and the variable diameter section and the large diameter section on the upper locking ring are threadedly engaged with the upper inclined threaded portion. The bottom of the reinforcing rib extends into the variable diameter section and the large diameter section on the lower locking ring, and the variable diameter section and the large diameter section on the lower locking ring are threadedly engaged with the lower inclined threaded portion.

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