Reamer convenient to maintain

Abstract

The utility model provides a reamer convenient to maintain, and relates to the technical field of drilling machine accessories. The more than three blades are arranged along the peripheral direction of the outer edge of the mandrel, and mounting grooves are formed in the blades; the composite sheet is suitable for being assembled in the mounting groove of the blade, and the cutting side of the composite sheet is provided with cutting teeth used for cutting the stratum; wherein the cutter wings are detachably connected with the core shaft, and / or the composite sheets are detachably connected with the cutter wings. According to the reamer convenient to maintain, the composite pieces are designed to be of a detachable structure, the composite pieces can be detached from the mandrel independently or together with the blades, when the composite pieces are damaged, the composite pieces can be directly detached from the reamer to be replaced, the whole reamer does not need to be sent to a factory for maintenance, the maintenance difficulty of the reamer is reduced, and the maintenance efficiency is improved. The maintenance cost is reduced, the maintenance time is greatly shortened, and the situation that the construction progress is slowed down due to the fact that the reamer returns to a factory to be repaired is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling rig accessories, and particularly relates to a reamer which is convenient for maintenance. Background Art

[0002] During the process of oil drilling, various complex formation conditions are often encountered, such as soft clay, shale, medium-hard shale, and limestone. These formations often pose higher requirements on drilling tools, which need to have efficient cutting ability, good wear resistance, and long service life. An oil drilling rig is a device used in oil drilling. In oil drilling, it drives the drill tool to break rocks, drill into the ground, and drill a wellbore with a specified depth for an oil production machine or a gas production machine to obtain oil or natural gas. There are many types of drill tools used in combination with the drilling rig. Among them, a PDC reamer is a highly efficient reaming drill tool widely used in the field of oil drilling. It uses polycrystalline diamond compact (PDC) as the cutting element. This material has extremely high hardness and wear resistance and can maintain stable cutting performance under various formation conditions. The PDC reamer is mainly used for drilling operations in soft to medium-hard formations, especially suitable for application in sticky formations with spalling problems. In addition, the PDC reamer can also be applied in trenchless construction to expand the diameter of the pilot hole.

[0003] After the existing PDC reamer is used for a period of time, it is severely worn and cannot be used continuously. Even if only the cutting part is damaged, the entire reamer still needs to be removed and returned to the factory for repair, and the repair method is very inconvenient. Summary of the Utility Model

[0004] An embodiment of the utility model provides a reamer which is convenient for maintenance, aiming to independently remove the damaged part of the reamer and reduce the maintenance difficulty of the reamer.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide a reamer which is convenient for maintenance, including:

[0006] A mandrel, connected to the drilling end of the drilling rig;

[0007] More than 3 cutter wings, arranged along the circumferential direction of the outer edge of the mandrel, and mounting grooves are formed on the cutter wings; and

[0008] A composite sheet, adapted to be assembled in the mounting groove of the cutter wing, and cutting teeth for cutting the formation are arranged on the cutting side of the composite sheet;

[0009] Wherein, the cutter wing is detachably connected to the mandrel, and / or the composite sheet is detachably connected to the cutter wing.

[0010] In the embodiments of the present application, the composite sheet is designed as a replaceable detachable structure. When the composite sheet is damaged, the composite sheet can be directly removed from the reamer for replacement without sending the entire reamer to the factory for repair, which reduces the repair difficulty of the reamer, reduces the repair cost, greatly shortens the repair time, and avoids delaying the construction progress due to the reamer being sent back to the factory for repair.

[0011] In a possible implementation manner, the cutter blade and the mandrel are of an integral structure, and the composite sheet is detachably assembled in the installation groove of the cutter blade by means of a connecting piece so as to facilitate the replacement of the composite sheet.

[0012] In another possible embodiment, a limiting groove adapted to install the cutter blade is provided on the outer edge of the mandrel;

[0013] The cutter blade is detachably installed in the limiting groove by means of a connecting piece so as to facilitate the replacement of the cutter blade.

[0014] In some embodiments, the composite sheet is detachably assembled in the installation groove of the cutter blade by means of a connecting piece.

[0015] In a possible implementation manner, the composite sheet is formed by splicing a plurality of sub-composite sheets, and each sub-composite sheet is detachably connected to the cutter blade;

[0016] Wherein, at least two cutting teeth are provided on each sub-composite sheet.

[0017] In the embodiments of the present application, the composite sheet is designed to be composed of a plurality of independently detachable sub-composite sheets. When the composite sheet is worn, only the damaged sub-composite sheet can be replaced without removing the whole composite sheet from the cutter blade, and the undamaged part can still be used continuously. By accurately positioning and repairing the damaged part, waste of materials can be avoided, and the use cost can be further saved.

[0018] In a possible implementation manner, multiple rows of cutting teeth are provided on the composite sheet, and the single row of cutting teeth is arranged along the length direction of the cutter blade; and two adjacent rows of cutting teeth are staggered to reduce the cutting blind area.

[0019] In the embodiments of the present application, multiple rows of staggered cutting teeth are provided, which can avoid the formation of a cutting blind area at the interval position in a single row of cutting teeth and fully improve the cutting efficiency.

[0020] In some embodiments, auxiliary teeth are further provided on the composite sheet, and the auxiliary teeth are provided on the side of the cutting teeth away from the cutting end face.

[0021] In the embodiments of the present application, auxiliary teeth are designed to cooperate with cutting teeth for cutting, which plays a role in dispersing the cutting force, avoiding excessive stress concentration on the cutting teeth, reducing the risk of the cutting teeth being overloaded due to excessive load, helping to extend the service life of the cutting teeth, and improving the stability and reliability of the reaming operation.

[0022] In some embodiments, an anti-wear structure is further provided on the composite sheet, and the anti-wear structure is arranged at the non-cutting part of the composite sheet to prevent the surface of the cutter wing from directly contacting the rock formation and causing wear.

[0023] In the embodiments of the present application, an anti-wear structure is arranged at the part of the composite sheet where no cutting teeth are provided, which forms a protection for the composite sheet and reduces the wear of the non-cutting part. Description of the Drawings

[0024] Figure 1 Schematic diagram of the structure of the reamer provided in Embodiment 1 of the present utility model;

[0025] Figure 2 For the present utility model Figure 1 Partial enlarged view of part A;

[0026] Figure 3 Schematic diagram of the structure of the cutter wing in Embodiment 1 of the present utility model;

[0027] Figure 4 Schematic diagram of the structure of the reamer provided in Embodiment 2 of the present utility model;

[0028] Figure 5 Schematic diagram of the structure of the cutter wing in Embodiment 2 of the present utility model;

[0029] Figure 6 Front view of the cutter wing in Embodiment 2 of the present utility model;

[0030] Figure 7 Schematic diagram of the structure of the mandrel in Embodiment 2 of the present utility model.

[0031] Description of the reference numerals:

[0032] 10 - Composite sheet; 11 - Cutting teeth; 12 - Auxiliary teeth; 13 - Anti-wear structure;

[0033] 20 - Cutter wing; 21 - Installation groove;

[0034] 30 - Mandrel; 31 - Limiting groove. Detailed Description of the Embodiments

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0039] Based on multiple usage experiences, the inventor found that the existing reamer structure has the following problems: on the existing reamer, the upper cutting blades are fixed to the mandrel and the composite inserts are fixed to the cutting blades by welding. Since the composite inserts cannot be disassembled from the reamer, even if only a certain cutting part of the composite insert is damaged, the whole reamer still needs to be sent back to the factory for repair. It is impossible to repair the damaged part separately. The repair is difficult and costly, and a lot of time is wasted on sending it back to the factory for repair, seriously delaying the construction progress. Based on the above problems, the present utility model provides a reamer that is easy to repair. The composite inserts can be removed and replaced from the reamer, and the damaged part can be replaced and repaired separately without sending the whole reamer back to the factory for repair. The following is a detailed description according to specific embodiments and the accompanying drawings.

[0040] Please refer to the attached Figure 1 to the attached Figure 7, a reamer that is easy to repair provided by the present utility model will be described. The reamer that is easy to repair includes a mandrel 30, more than 3 cutter wings 20, and a composite bit 10; wherein, cutter wings 20 are arranged on the mandrel 30, and the composite bit 10 for cutting is assembled on the cutter wings 20. The composite bit 10 and the cutter wings 20 are detachably connected, or the composite bit 10 and the cutter wings 20 are detachably connected to the mandrel 30 as a whole.

[0041] Specifically, the mandrel 30 is connected to the drilling end of the drill. The cutter wings 20 are arranged along the circumferential direction of the outer edge of the mandrel 30, and mounting grooves 21 are formed on the cutter wings 20. The composite bit 10 is adapted to be assembled in the mounting grooves 21 of the cutter wings 20, and cutting teeth 11 for cutting the formation are arranged on the cutting side of the composite bit 10. Among them, the cutter wings 20 and the mandrel 30 are detachably connected, and / or the composite bit 10 and the cutter wings 20 are detachable.

[0042] For the reamer that is easy to repair provided by the embodiment of the present application, compared with the integral structure of the existing reamer, the composite bit 10 is designed to be assembled with the main body structure of the reamer in a split manner. The composite bit 10 can be detached from the reamer for independent replacement. After the cutting part is worn, the main body structure of the reamer can be retained, and only the composite bit 10 needs to be replaced. There is no need to send the whole reamer to the factory for repair. When replacing, the composite bit 10 can be separately removed from the cutter wings 20, or the composite bit 10 together with the cutter wings 20 can be removed from the mandrel 30. The replacement method is simple and convenient, saving a large amount of repair time and repair cost, and improving the construction efficiency.

[0043] In an alternative embodiment, please refer to the attached Figure 1 、attached Figure 2 、attached Figure 3 , the cutter wings 20 and the mandrel 30 are of an integral structure, and the composite bit 10 is detachably assembled in the mounting grooves 21 of the cutter wings 20 by means of a connecting piece to facilitate the replacement of the composite bit 10.

[0044] In another alternative embodiment, please refer to the attached Figure 4 to the attached Figure 7 , a limiting groove 31 adapted to install the cutter wings 20 is formed on the outer edge of the mandrel 30; the cutter wings 20 are detachably installed in the limiting groove 31 by means of a connecting piece to facilitate the replacement of the cutter wings 20. Optionally, the composite bit 10 is detachably assembled in the mounting grooves 21 of the cutter wings 20 by means of a connecting piece.

[0045] In the above two embodiments, the connecting piece is a bolt, and the composite bit 10 can be detachably installed in the mounting groove 21 by the bolt.

[0046] In an alternative embodiment, please refer to the attached Figure 1 、attached Figure 2, the composite piece 10 is formed by splicing multiple sub-composite pieces, and each sub-composite piece is detachably connected to the cutter blade 20 respectively; wherein, at least two cutting teeth 11 are provided on each sub-composite piece. Preferably, the number of cutting teeth 11 on a single composite piece 10 is 3 - 5.

[0047] In the above embodiment, the composite piece 10 is designed as multiple separately detachable sub-composite pieces. During repair, only the damaged sub-composite piece can be separately removed and replaced, without removing the entire composite piece 10. The remaining intact parts can continue to be put into use, further reducing the cost of replacing components.

[0048] In some embodiments, please refer to the appendix Figure 5 and the appendix Figure 6 , multiple rows of cutting teeth 11 are provided on the composite piece 10, and the single-row cutting teeth 11 are arranged along the length direction of the cutter blade 20; and two adjacent rows of cutting teeth 11 are arranged staggeredly to reduce the cutting blind area. Further, a strip-shaped groove is formed between two adjacent rows of cutting teeth 11.

[0049] In the above embodiment, compared with the single-row arranged cutting teeth 11, arranging multiple rows of cutting teeth 11 staggeredly can reduce the cutting blind area formed at the gap position of the cutting teeth 11, fully expand the cutting surface, and improve the utilization rate of the cutting component.

[0050] In some embodiments, please refer to the appendix Figure 1 and the appendix Figure 2 , an auxiliary tooth 12 is further provided on the composite piece 10, and the auxiliary tooth 12 is arranged on the side of the cutting tooth 11 away from the cutting end face. Preferably, the auxiliary tooth 12 is of a hemispherical structure.

[0051] In the above embodiment, the auxiliary tooth 12 is used to disperse stress, reduce the stress concentration on the cutting tooth 11, limit the depth of the cutting tooth 11 cutting into the formation, avoid damage to the cutting tooth 11 due to overload, and extend the service life of the cutting structure.

[0052] In the above embodiment, the auxiliary tooth 12 can be designed as a spherical structure. The shape of the spherical tooth enables it to adapt to various formation conditions, including rocks with different hardness and fragmentation. The structure of the spherical tooth helps to more evenly disperse the cutting force over the entire tooth surface, reduce the risk of overload, contribute to improving the smoothness of the cutting process, and since the cutting surface of the spherical tooth is relatively smooth and the contact area with the formation is relatively large, the cutting pressure per unit area is relatively small, which can reduce the wear rate during the cutting process and extend the service life of the auxiliary tooth 12.

[0053] In some embodiments, please refer to the appendix Figure 4 and the appendix Figure 5 and the appendix Figure 6, an anti-wear structure 13 is further provided on the composite piece 10. The anti-wear structure 13 is arranged at the non-cutting part of the composite piece 10 to prevent the surface of the cutter blade 20 from directly contacting the rock formation and causing wear. Preferably, the anti-wear structure is composed of a plurality of uniformly distributed disc-shaped protrusions.

[0054] In the above embodiment, by providing the anti-wear structure 13 on the composite piece 10, the part without the cutting teeth 11 is protected, the wear of the non-cutting area is reduced, and the service life of the composite piece 10 is prolonged.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reamer that is easy to maintain, characterized in that: include: a mandrel, connected to the drilling end of the drill; More than three blades are arranged along the circumferential direction of the outer edge of the core shaft, and the blades are provided with mounting grooves; and A composite sheet, adapted to be assembled in the mounting groove of the blade, wherein the cutting side of the composite sheet is provided with cutting teeth for cutting the formation; Wherein, the blade wing is detachably connected to the core shaft, and / or the composite sheet is detachably connected to the blade wing.

2. The easily maintainable reamer according to claim 1, characterized in that: The blade wing and the core shaft are an integral structure, and the composite sheet is detachably assembled in the mounting groove of the blade wing by means of a connecting piece, so as to facilitate the replacement of the composite sheet.

3. The easily maintainable reamer according to claim 1, characterized in that: The outer edge of the core shaft is provided with a limiting groove suitable for installing the blade wing; The blade wing is detachably mounted in the limiting groove by means of a connecting piece, so as to facilitate replacement of the blade wing.

4. The easily maintainable reamer according to claim 3, characterized in that: The composite sheet is detachably assembled in the mounting groove of the blade wing by means of a connecting piece.

5. The easily maintainable reamer according to claim 2 or 4, characterized in that: The composite sheet is composed of a plurality of sub-composite sheets, and each sub-composite sheet is detachably connected to the blade wing; Wherein, each of the sub-composite sheets is provided with at least two cutting teeth.

6. The easily maintainable reamer according to claim 1, characterized in that: The cutting teeth on the composite sheet are arranged in multiple rows, and the cutting teeth in a single row are arranged along the length direction of the blade; and the cutting teeth in two adjacent rows are arranged in a staggered manner to reduce the cutting blind area.

7. The easily maintainable reamer according to claim 1, characterized in that: Auxiliary teeth are also arranged on the composite sheet, and the auxiliary teeth are arranged on a side of the cutting teeth away from the cutting end surface.

8. The easily maintainable reamer according to claim 1, characterized in that: The composite sheet is also provided with an anti-wear structure, which is arranged at a non-cutting position of the composite sheet to prevent the blade surface from directly contacting the rock formation and causing wear.

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