Novel deflecting section reamer bit

Abstract

The utility model discloses a novel deflecting section reamer bit. The novel deflecting section reamer bit comprises a guide bit, a connecting shaft, a reaming stable gauge protection bit and a drilling tool protection connector which are sequentially and coaxially connected. The diameter of the chambering stable gauge protection drill bit is larger than that of the guide drill bit, a plurality of abrasion-resistant anti-impact alloy blocks are arranged on the outer surface of the guide drill bit and the outer surface of the chambering stable gauge protection drill bit, and a plurality of alloy abrasion-resistant belts are further arranged on the outer surface of the guide drill bit. The end, away from the guide drill bit, of the drilling tool protection connector forms a connecting part connected with a drilling tool. The reaming device is simple in structure, reaming track deviation can be effectively reduced, the risk of new drilling in the reaming process is avoided, and the design requirement is better met while the construction precision is ensured; the reaming efficiency can be remarkably improved, waste of slurry materials is reduced, and the construction cost is reduced to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, in particular to a novel beveling section reaming drill bit. Background Art

[0002] In the process of coal mining, in order to ensure the safe mining of coal seams, it is usually necessary to plug the aquifers near the coal seams. At present, Shanxi, Hebei, Anhui and other places generally use horizontal branch holes for plugging; before constructing the horizontal section, it is usually necessary to construct a deflection section from the ground to the horizontal section. This process is particularly difficult in hard or soft formations, especially when using large-diameter screws for directional deflection, which often leads to insufficient deflection rate and cannot achieve the expected deflection purpose.

[0003] In order to solve the above problems, a small screw is usually used to solve the problem of deflection. After the small screw completes the deflection trajectory, the guide hole completed by the small screw is expanded by a reaming drill bit. However, the conventional reaming drill bit is prone to run out of a new hole during the operation, resulting in construction failure, and the construction needs to be re-performed, which greatly reduces the construction efficiency. Therefore, a new type of deflection section reaming drill bit is urgently needed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a novel beveling section reaming drill bit.

[0005] The utility model discloses a novel inclination section hole enlarging drill bit, comprising a guide drill bit, a connecting shaft, a hole enlarging stable diameter maintaining drill bit and a drill tool protection joint which are coaxially connected in sequence;

[0006] The diameter of the hole expansion stable diameter maintenance drill bit is larger than the diameter of the guide drill bit. The outer surfaces of the guide drill bit and the hole expansion stable diameter maintenance drill bit are both provided with a plurality of wear-resistant and impact-resistant alloy blocks. The outer surface of the guide drill bit is also provided with a plurality of alloy wear-resistant belts. The end of the drill tool protection joint away from the guide drill bit constitutes a connection part connected to the drill tool.

[0007] As a further improvement of the utility model, the interiors of the connecting shaft, the hole-expanding stable diameter-maintaining drill bit and the drill protection joint are all hollow structures to form a drilling fluid circulation channel connected along the axial direction of the hole-expanding drill bit in the deflection section;

[0008] The guide drill bit is provided with a first water hole; the hole expansion stable diameter maintenance drill bit is provided with a plurality of second water holes, and the first water hole and the plurality of the second water holes are both connected with the drilling fluid circulation channel.

[0009] As a further improvement of the utility model, the guide drill bit is composed of a three-wing guide triangle and a cylindrical positioning drill bit connected in sequence; the cylindrical positioning drill bit is coaxially sleeved on the outside of the connecting shaft, the outside of the bottom of the three-wing guide triangle is respectively fixedly connected to the front edge of the cylindrical positioning drill bit, the bottom center of the three-wing guide triangle is connected to the connecting shaft, and the connecting shaft is provided with the first water eye corresponding to the three-wing guide triangle.

[0010] As a further improvement of the utility model, the slope of the cylindrical positioning drill bit is 20°-35°, and a plurality of the alloy wear-resistant belts and a plurality of the wear-resistant and impact-resistant alloy blocks are evenly distributed on the outer circumferential surface of the cylindrical positioning drill bit.

[0011] As a further improvement of the present invention, the length of the guide drill bit is 1 / 4 of the total length of the bevel section reaming drill bit, and the diameter of the guide drill bit is larger than the aperture of the guide hole and smaller than the maximum diameter of the bevel section reaming drill bit.

[0012] As a further improvement of the utility model, the length of the connecting shaft is 1 / 4 of the total length of the beveling section reaming drill bit.

[0013] As a further improvement of the utility model, the hole expansion stable diameter maintaining drill bit is composed of a diameter maintaining drill bit body and a plurality of tooth palms arranged on the front edge thereof, each of the tooth palms is rotatably connected to a gear, the outer side surface of each of the tooth palms is provided with a plurality of wear-resistant and impact-resistant alloy blocks, and a second water hole is provided between two adjacent tooth palms.

[0014] As a further improvement of the utility model, the diameter-keeping drill bit body is a cylindrical diameter-keeping drill bit body, which is coaxially sleeved on the outer circumferential surface of the connecting shaft and fixedly connected to the connecting shaft. The cylindrical diameter-keeping drill bit is evenly circumferentially arranged with four tooth palms on one side close to the guide drill bit, each of which is rotatably connected to a tooth wheel, and the second water hole is provided between two adjacent tooth palms; multiple rows of wear-resistant and impact-resistant alloy blocks are arranged on the outer side of each tooth palm parallel to the axial direction of the beveling section reaming drill bit; multiple rows of wear-resistant and impact-resistant alloy blocks are staggered with each other in the circumferential direction.

[0015] As a further improvement of the present invention, the length of the hole-expanding stable diameter-maintaining drill bit is 1 / 4 of the total length of the beveling section hole-expanding drill bit, and the diameter of the hole-expanding stable diameter-maintaining drill bit is the target hole diameter.

[0016] As a further improvement of the utility model, a thread is provided at one end of the drill tool protection joint away from the guide drill bit, and the thread constitutes a connecting portion for connecting the drill tool.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model has a simple structure and can effectively reduce the deviation of the hole expansion trajectory and avoid the risk of new drilling during the hole expansion process, so as to ensure the construction accuracy and better meet the design requirements.

[0019] Compared with the existing construction method, the utility model can significantly improve the hole expansion efficiency, reduce the waste of mud materials, and reduce the construction cost to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a novel beveling section reaming drill bit disclosed in one embodiment of the utility model;

[0021] Figure 2 The utility model is a structural side view of a novel beveling section reaming drill bit disclosed in an embodiment of the utility model.

[0022] In the figure:

[0023] 1. Guide drill bit; 11. Three-wing guide triangle; 12. Cylindrical positioning drill bit; 2. Connecting shaft; 3. Hole expansion stable diameter-keeping drill bit; 31. Cylindrical diameter-keeping drill bit body; 32. Tooth palm; 33. Cone; 4. Drill tool protection joint; 41. Thread; 5. Drilling fluid circulation channel; 6. First water hole; 7. Second water hole; 8. Alloy wear-resistant belt; 9. Wear-resistant and impact-resistant alloy block. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0028] like Figure 1-2 As shown, a new type of inclined section reaming drill bit provided by the utility model comprises a guide drill bit 1, a connecting shaft 2, a stable reaming drill bit 3 and a drill tool protection joint 4, wherein the guide drill bit 1, the connecting shaft 2, the stable reaming drill bit 3 and the drill tool protection joint 4 are coaxially connected in sequence respectively; the diameter of the stable reaming drill bit 3 is larger than the diameter of the guide drill bit 1, and the outer surfaces of the guide drill bit 1 and the stable reaming drill bit 3 are provided with a plurality of wear-resistant and impact-resistant alloy blocks 9, and the outer surface of the guide drill bit 1 is also provided with a plurality of alloy wear-resistant belts 8; the end of the drill tool protection joint 4 away from the guide drill bit 1 constitutes a connecting portion connected to the drill tool.

[0029] In this embodiment, the structure is simple, and the deviation of the hole expansion trajectory can be effectively reduced, avoiding the risk of new drilling during the hole expansion process, thereby ensuring construction accuracy while better meeting design requirements; compared with existing construction methods, the hole expansion efficiency can be significantly improved, the waste of mud materials can be reduced, and the construction cost can be reduced to a certain extent.

[0030] Specific:

[0031] like Figure 1-2 As shown, in the above embodiment, preferably, the interior of the connecting shaft 2, the hole expansion stable diameter protection drill bit 3 and the drill protection joint 4 are all hollow structures to form a drilling fluid circulation channel 5 connected along the axial direction of the hole expansion drill bit of the deflection section; a first water hole 6 is provided at the guide drill bit 1; a plurality of second water holes 7 are provided at the hole expansion stable diameter protection drill bit 3, and the first water hole 6 and the plurality of second water holes 7 are both connected to the drilling fluid circulation channel 5. The apertures of the first water hole 6 and the plurality of second water holes 7 in this embodiment can be determined according to the on-site pump volume requirements to ensure the safety of the well during the construction process. In this embodiment, the setting of the first water hole 6 can provide drilling fluid for the guide drill bit 1, reduce the temperature of the guide drill bit 1, and thus ensure the reliable construction of the drill bit; the setting of the plurality of second water holes 7 can enable the mud to flow out from the top of the drill bit to play the role of returning sand, lubrication, and reducing the temperature of the drill bit.

[0032] In the above embodiment, preferably, the guide drill bit 1 is composed of a three-wing guide triangle 11 and a cylindrical positioning drill bit 12 connected in sequence; wherein, the triangular side length of the three-wing guide triangle 11 accounts for 1 / 8 of the total length of the bevel section reaming drill bit, and the thickness of the three-wing guide triangle 11 is 1 / 3 of its triangular side length. During actual assembly, the bottom outer side of the three-wing guide triangle 11 is fixedly connected to the front edge of the cylindrical positioning drill bit 12, the bottom center of the three-wing guide triangle 11 is connected to the connecting shaft 2, and the connecting shaft 2 is provided with a first water hole 6 corresponding to the three-wing guide triangle 11. The cylindrical positioning drill bit 12 is coaxially sleeved on the outside of the connecting shaft. The outer surface of the three-wing guide triangle 11 is provided with an alloy wear-resistant belt 8. In this embodiment, the alloy wear-resistant belt 8 is formed by welding of a high-strength wear-resistant alloy.

[0033] In the above embodiment, preferably, the slope of the cylindrical positioning drill bit 12 is 20°-35°, and a plurality of alloy wear-resistant belts 8 and a plurality of wear-resistant and impact-resistant alloy blocks 9 are evenly distributed on the outer circumferential surface of the cylindrical positioning drill bit 12. In this embodiment, the alloy wear-resistant belt 8 is formed by welding a high-strength wear-resistant alloy, and during production, half of the alloy wear-resistant belt 8 is embedded in the cylindrical positioning drill bit 12 to ensure the stability of the alloy wear-resistant belt.

[0034] In the above embodiment, preferably, the length of the guide drill bit 1 is 1 / 4 of the total length of the bevel section reaming drill bit, and the diameter of the guide drill bit 1 is larger than the aperture of the guide hole and smaller than the maximum diameter of the bevel section reaming drill bit; the diameter of the guide drill bit 1 in this embodiment is preferably 2 / 3 of the diameter of the guide hole and the maximum diameter of the bevel section reaming drill bit. In this embodiment, because the head of the guide drill bit 1 is relatively small, it is basically located in the middle of the borehole under the action of the reaming stable diameter-keeping drill bit 3, which can ensure that it moves along the original trajectory.

[0035] In the above embodiment, preferably, the connecting shaft 2 is made of a high-strength inner core of a screw, the outer diameter is suitable for meeting the torque, and the length of the connecting shaft 2 is 1 / 4 of the total length of the reaming drill bit in the inclination section; on the one hand, it can ensure the reliable connection between the guide drill bit 1 and the reaming stable diameter drill bit 3, and on the other hand, it can also provide drilling fluid for the guide drill bit 1 to reduce the drill bit temperature, thereby ensuring the reliable construction of the drill bit.

[0036] In the above embodiment, preferably, the borehole expansion stable diameter-maintaining drill bit 3 is composed of a diameter-maintaining drill bit body and a plurality of teeth palms 32 arranged at the front edge thereof, each tooth palm 32 is rotatably connected to a cone 33, the outer side surface of each tooth palm 32 is provided with a plurality of wear-resistant and impact-resistant alloy blocks 9, and a second water hole 7 is provided between two adjacent teeth palms 32. In this embodiment, the diameter-maintaining drill bit body is a cylindrical diameter-maintaining drill bit body 31, which is coaxially sleeved on the outer circumferential surface of the connecting shaft 2 and fixedly connected to the connecting shaft 2, and four teeth palms 32 are evenly arranged on the side of the cylindrical diameter-maintaining drill bit 31 close to the guide drill bit 1, each tooth palm 32 is rotatably connected to a cone 33, and a second water hole 7 is provided between two adjacent teeth palms 32; multiple rows of wear-resistant and impact-resistant alloy blocks 9 are arranged on the outer side surface of each tooth palm 32 in parallel with the axial direction of the beveling section borehole expansion drill bit; multiple rows of wear-resistant and impact-resistant alloy blocks 9 are arranged in an interlaced manner in the circumferential direction.

[0037] In the above embodiment, preferably, the four teeth palms 32 are symmetrically arranged in pairs along the upper, lower, left and right directions on one side of the cylindrical gauge drill bit 31 close to the guide drill bit 1.

[0038] In the above embodiment, preferably, the length of the hole expansion stable diameter maintaining drill bit 3 is 1 / 4 of the total length of the hole expansion drill bit in the deflection section, and the diameter of the hole expansion stable diameter maintaining drill bit 3 is the target hole diameter.

[0039] In the above embodiment, preferably, the wear-resistant and impact-resistant alloy block 9 is made of tungsten steel, and 2 / 3 of the wear-resistant and impact-resistant alloy block 9 is embedded in the tooth palm 32 to ensure the stability of the wear-resistant and impact-resistant alloy block 9, and the remaining 1 / 3 of the wear-resistant and impact-resistant alloy block 9 remains cylindrical. The thickness of the cylindrical wear-resistant and impact-resistant alloy block 9 protruding from the surface of the tooth palm 32 meets the torque requirement, and it is mainly used for cutting the formation during hole expansion to ensure progress.

[0040] In the above embodiment, preferably, a plurality of wear-resistant and impact-resistant alloy blocks 9 can also be arranged on the outer circumferential surface of the cylindrical gauge drill body 31, and the arrangement structure is consistent with the method of the tooth palm 32. In this embodiment, the cylindrical gauge drill body 31 is also made of tungsten steel alloy, which is used to further expand the hole diameter and reach the original trajectory (target hole) hole diameter to ensure that the second opening casing can be smoothly lowered into the hole in the later stage.

[0041] In the above embodiment, preferably, a thread 41 is provided at one end of the drill protection sub 4 away from the guide drill bit 1, and the thread 41 constitutes a connection part for connecting the drill. The setting of the drill protection sub 4 ensures the continuous output of the drill bit torque, and the internal hollow design can provide a steady supply of drilling fluid for the reaming drill bit in the deflection section, which plays a vital role and is one of the keys to preventing deviation.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new type of beveling section reaming drill bit, characterized in that: It includes a guide drill bit, a connecting shaft, a hole expansion stable diameter protection drill bit and a drill tool protection joint which are coaxially connected in sequence; The diameter of the hole expansion stable diameter maintenance drill bit is larger than the diameter of the guide drill bit. The outer surfaces of the guide drill bit and the hole expansion stable diameter maintenance drill bit are both provided with a plurality of wear-resistant and impact-resistant alloy blocks. The outer surface of the guide drill bit is also provided with a plurality of alloy wear-resistant belts. The end of the drill tool protection joint away from the guide drill bit constitutes a connection part connected to the drill tool.

2. The novel beveling section reaming drill bit according to claim 1 is characterized in that: The interiors of the connecting shaft, the hole-expanding stable diameter-maintaining drill bit and the drill protection joint are all hollow structures, so as to form a drilling fluid circulation channel connected along the axial direction of the hole-expanding drill bit in the deflection section; The guide drill bit is provided with a first water hole; the hole expansion stable diameter maintenance drill bit is provided with a plurality of second water holes, and the first water hole and the plurality of the second water holes are both connected with the drilling fluid circulation channel.

3. The novel beveling section reaming drill bit according to claim 2 is characterized in that: The guide drill bit is composed of a three-wing guide triangle and a cylindrical positioning drill bit connected in sequence; the cylindrical positioning drill bit is coaxially sleeved on the outside of the connecting shaft, the outside of the bottom of the three-wing guide triangle is respectively fixedly connected to the front edge of the cylindrical positioning drill bit, the bottom center of the three-wing guide triangle is connected to the connecting shaft, and the connecting shaft is provided with the first water eye corresponding to the three-wing guide triangle.

4. The novel beveling section reaming drill bit according to claim 3 is characterized in that: The slope of the cylindrical positioning drill bit is 20°-35°, and a plurality of the alloy wear-resistant belts and a plurality of the wear-resistant and impact-resistant alloy blocks are evenly distributed on the outer circumferential surface of the cylindrical positioning drill bit.

5. The novel beveling section reaming drill bit according to claim 1 is characterized in that: The length of the guide drill bit is 1 / 4 of the total length of the bevel section reaming drill bit, and the diameter of the guide drill bit is larger than the aperture of the guide hole and smaller than the maximum diameter of the bevel section reaming drill bit.

6. The novel beveling section reaming drill bit according to claim 1 is characterized in that: The length of the connecting shaft is 1 / 4 of the total length of the reaming drill bit in the beveling section.

7. The novel beveling section reaming drill bit according to claim 2 is characterized in that: The hole expansion stable diameter maintenance drill bit is composed of a diameter maintenance drill bit body and a plurality of tooth palms arranged around its front edge, each of the tooth palms is rotatably connected to a gear, the outer side surface of each tooth palm is provided with a plurality of wear-resistant and impact-resistant alloy blocks, and a second water hole is provided between two adjacent tooth palms.

8. The novel beveling section reaming drill bit according to claim 7 is characterized in that: The diameter-protected drill bit body is a cylindrical diameter-protected drill bit body, which is coaxially sleeved on the outer circumferential surface of the connecting shaft and fixedly connected to the connecting shaft. The cylindrical diameter-protected drill bit is evenly circumferentially arranged with four tooth palms on one side close to the guide drill bit, each of which is rotatably connected to a tooth wheel, and the second water hole is provided between two adjacent tooth palms; multiple rows of wear-resistant and impact-resistant alloy blocks are arranged on the outer side of each tooth palm in parallel along the axial direction of the beveling section reaming drill bit; the multiple rows of wear-resistant and impact-resistant alloy blocks are staggered with each other in the circumferential direction.

9. The novel beveling section reaming drill bit according to claim 1 is characterized in that: The length of the hole-expanding stable diameter-maintaining drill bit is 1 / 4 of the total length of the hole-expanding drill bit in the deflection section, and the diameter of the hole-expanding stable diameter-maintaining drill bit is the target hole diameter.

10. The novel beveling section reaming drill bit according to claim 1 is characterized in that: A thread is arranged at one end of the drill tool protection joint away from the guide drill bit, and the thread constitutes a connecting part connected with the drill tool.

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