A multi-stage step drill

Abstract

This utility model discloses a multi-stage stepped drill bit, relating to the field of roller cone drill bit technology. It includes a roller cone drill bit assembly composed of a hollow mandrel, a first support base, and a second support base, as well as a roller cone assembly. The bottom end of the first support base and the top end of the second support base are both formed with I-shaped grooves. The roller cone assembly includes a roller cone seat, roller cones, an I-shaped socket, and a T-shaped mounting hole. This utility model, by setting up the first and second support bases with I-shaped grooves and the roller cone assembly with I-shaped sockets, enables convenient disassembly and assembly of the roller cone assembly. Compared to traditional gas cutting disassembly and welding installation methods, it is not only faster and easier, but also further improves the maintenance efficiency of large-diameter stepped roller cone drill bits. Furthermore, the reinforcement components further improve the installation stability of the roller cone assembly, ensuring stable use of the roller cone drill bit.

Description

Technical Field

[0001] This utility model relates to the field of roller cone drill bit technology, specifically a multi-stage stepped drill bit. Background Technology

[0002] Roller cone bits are the most widely used type of drilling bit. Traditional large-diameter drilling processes generally involve drilling small-diameter holes (using pre-made tricone bits) and then enlarging large-diameter holes (using large-diameter pointed ribbed blade drill bits) in stages. To complete a large-diameter well, several stages of enlarging are usually required to reach the designed diameter, which prolongs the drilling cycle. Therefore, a large-diameter stepped roller cone bit has emerged on the market. By setting two or more sets of roller cone bits with progressively increasing diameters, a large-diameter well can be drilled in one go, further improving the efficiency of large-diameter drilling operations.

[0003] In practical use, the roller cones of a reamer need to be replaced periodically due to wear. However, most of the roller cones on existing reamers are welded. When replacing the roller cones, the old roller cones need to be cut off with an oxy-acetylene torch and then the new roller cones need to be welded. Large-diameter stepped roller cone drill bits have a large number of roller cones, which leads to high workload and long construction cycle when replacing roller cones. Therefore, in order to achieve convenient replacement of roller cones, a multi-stage stepped drill bit is provided. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage stepped drill bit in order to solve the problems mentioned above.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage stepped drill bit, comprising a roller cone drill bit assembly and a roller cone assembly consisting of a hollow mandrel, a first support seat, and a second support seat. The first support seat and the second support seat are vertically distributed and fixed to the outside of the hollow mandrel. The bottom end of the first support seat and the top end of the second support seat are both formed with I-shaped grooves.

[0006] The roller assembly includes a roller seat, a roller, an I-shaped socket, and a T-shaped mounting hole;

[0007] The gear is rotatably connected to the bottom side of the gear seat, and the I-shaped socket is integrally formed on the top side of the gear seat. The gear seat is inserted into the inside of the I-shaped slot through the I-shaped socket.

[0008] The T-shaped mounting hole is opened on the other side of the top of the gear seat and completely penetrates the I-shaped socket. The I-shaped slot has a screw hole corresponding to the T-shaped mounting hole. The gear seat is connected and fixed to the first support seat and the second support seat by passing a bolt through the T-shaped mounting hole and tightening it with the screw thread, thereby realizing the detachable installation of the gear assembly.

[0009] A reinforcing component is also provided between the first support base and the second support base, which is used to reinforce the installation of the toothed wheel assembly.

[0010] As a further improvement of this utility model: the reinforcement component includes a sealing disc and an L-shaped reinforcement member;

[0011] The sealing disc is slidably sleeved on the outside of the hollow mandrel and fits against the lower surface of the first support base, and is used to seal the opening of the I-shaped slot on the first support base;

[0012] Two L-shaped reinforcement components are provided, which are symmetrically distributed and sleeved on the outside of the hollow mandrel. The top of the vertical part of the L-shaped reinforcement component is attached to the bottom of the sealing disk to support the sealing disk.

[0013] The lateral portion of the L-shaped reinforcement fits against the upper surface of the second support base to seal the opening of the I-shaped slot on the second support base.

[0014] As a further improvement of this utility model: the outer wall size of the I-shaped socket matches the inner wall size of the I-shaped slot, and the first support base and the second support base are provided with a plurality of I-shaped slots evenly distributed in a ring.

[0015] As a further embodiment of this utility model: the bottom of the first support base and the bottom of the second support base are both fixed with nozzles that communicate with the inner cavity of the hollow mandrel. The number and position of the nozzles correspond one-to-one with the number and position of the gear assembly, and the port of the nozzle is tilted towards the gear.

[0016] As a further improvement of this utility model: the sealing disc has an avoidance notch that matches the number of nozzles on the first support seat, and the sealing disc and the L-shaped reinforcement are connected and fixed to the first support seat and the second support seat respectively by bolts.

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

[0018] By setting up a first support base and a second support base with I-shaped slots, as well as a roller cone assembly with I-shaped slots, convenient disassembly and assembly of the roller cone assembly can be achieved. Compared with the traditional gas cutting disassembly and welding installation methods, it is not only faster and easier, but also further improves the maintenance efficiency of large-diameter stepped roller cone drill bits. In addition, by setting up reinforcement components, the installation stability of the roller cone assembly can be further improved, ensuring the stable use of the roller cone drill bit. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2This is a structural schematic diagram from another perspective of the present invention;

[0021] Figure 3 This is a schematic diagram showing the disassembled toothed wheel assembly and the second support base of this utility model;

[0022] Figure 4 This is a schematic diagram showing the disassembled toothed wheel assembly and the first support base of this utility model.

[0023] In the diagram: 1. Roller cone bit assembly; 101. Hollow mandrel; 102. First support seat; 103. Second support seat; 104. Nozzle; 105. I-shaped slot; 106. Screw hole; 2. Roller cone assembly; 201. Roller cone seat; 202. Roller cone; 203. I-shaped socket; 204. T-shaped mounting hole; 3. Reinforcing component; 301. Sealing plate; 302. L-shaped reinforcement component. Detailed Implementation

[0024] 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 protection scope of the present utility model.

[0025] Please see Figures 1-4 In this embodiment of the utility model, a multi-stage stepped drill bit includes a roller cone drill bit assembly 1 and a roller cone assembly 2, which are composed of a hollow mandrel 101, a first support seat 102 and a second support seat 103. The first support seat 102 and the second support seat 103 are vertically distributed and fixed to the outside of the hollow mandrel 101. The bottom end of the first support seat 102 and the top end of the second support seat 103 are both formed with I-shaped grooves 105.

[0026] The gear assembly 2 includes a gear seat 201, a gear 202, an I-shaped socket 203, and a T-shaped mounting hole 204;

[0027] The gear 202 is rotatably connected to the bottom side of the gear seat 201, and the I-shaped socket 203 is integrally formed on the top side of the gear seat 201. The gear seat 201 is inserted into the inside of the I-shaped slot 105 through the I-shaped socket 203.

[0028] T-shaped mounting hole 204 is opened on the other side of the top of the gear seat 201 and completely penetrates the I-shaped socket 203. The I-shaped slot 105 has a screw hole 106 corresponding to the T-shaped mounting hole 204. The bolt passes through the T-shaped mounting hole 204 and is screwed into the screw hole 106 to realize the connection and fixation between the gear seat 201 and the first support seat 102 and the second support seat 103, thereby realizing the detachable installation of the gear assembly 2.

[0029] A reinforcing component 3 is also provided between the first support base 102 and the second support base 103. The reinforcing component 3 is used to reinforce the installation of the toothed wheel assembly 2.

[0030] The reinforcement component 3 includes a sealing plate 301 and an L-shaped reinforcement component 302;

[0031] The sealing disc 301 is slidably sleeved on the outside of the hollow spindle 101 and fits against the lower surface of the first support seat 102, and is used to seal the opening of the I-shaped slot 105 on the first support seat 102.

[0032] Two L-shaped reinforcement members 302 are provided. The two L-shaped reinforcement members 302 are symmetrically distributed and sleeved on the outside of the hollow mandrel 101. The top of the vertical part of the L-shaped reinforcement member 302 is attached to the bottom of the sealing plate 301 to support the sealing plate 301.

[0033] The lateral portion of the L-shaped reinforcement 302 is attached to the upper surface of the second support 103 to seal the opening of the I-shaped slot 105 on the second support 103.

[0034] The outer wall dimensions of the I-shaped socket 203 match the inner wall dimensions of the I-shaped slot 105. Several I-shaped slots 105 are evenly distributed in a ring on the first support base 102 and the second support base 103.

[0035] In this embodiment: the operating principle of this roller cone drill bit assembly 1 is the same as that of roller cone drill bits on the market, and will not be elaborated here;

[0036] When it is necessary to replace the worn gear assembly 2, the procedure is as follows:

[0037] First, separate the L-shaped reinforcement 302 from the second support base 103, and then remove the L-shaped reinforcement 302. At this time, not only is the obstruction of the I-shaped slot 105 on the second support base 103 removed, but the compression of the sealing plate 301 is also relieved.

[0038] Afterwards, the fixing bolts of the gear assembly 2 on the second support 103 can be removed to disassemble the gear assembly 2 on the second support 103. Then, the new gear assembly 2 can be inserted into the corresponding I-shaped slot 105 through the I-shaped socket 203 and fixed with fixing bolts.

[0039] If the toothed gear assembly 2 on the first support 103 needs to be replaced, the sealing disc 301 needs to be separated from the first support 103, and then the fixing bolts of the toothed gear assembly 2 on the first support 102 need to be removed to complete the removal of the toothed gear assembly 2 on the first support 102. After that, the new toothed gear assembly 2 is installed and the sealing disc 301 is fixed.

[0040] The combination of these components enables convenient replacement of the roller cone assembly 2. Compared to the traditional methods of gas cutting disassembly and welding installation, this method is not only faster and easier, but also further improves the maintenance efficiency of large-diameter stepped roller cone drill bits.

[0041] Please refer to this carefully. Figures 1-4 The bottom of the first support 102 and the bottom of the second support 103 are both fixed with nozzles 104 that communicate with the inner cavity of the hollow spindle 101. The number and position of the nozzles 104 correspond one-to-one with the number and position of the gear assembly 2, and the port of the nozzle 104 is tilted towards the gear 202.

[0042] The sealing disc 301 has a clearance notch that matches the number of nozzles 104 on the first support seat 102. The sealing disc 301 and the L-shaped reinforcement 302 are connected and fixed to the first support seat 102 and the second support seat 103 respectively by bolts.

[0043] In this embodiment, it should be noted that the nozzle 104 is a conventional structure of existing roller cone drill bits. External water is injected into the mandrel 101 through the water channel on the drill rod and sprayed out through the nozzle 104. The water impact can be used to wash away the rock cuttings accumulated in the gap between the roller cones, so that the roller cone drill bit can maintain a good working condition.

[0044] By sealing the openings of the I-shaped slots 105 on the first support seat 102 and the second support seat 103 with the sealing disc 301 and the L-shaped reinforcement 302, the installation stability of the roller assembly 2 can be further improved.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-stage stepped drill bit, comprising a roller cone drill bit assembly (1) and a roller cone assembly (2) consisting of a hollow mandrel (101), a first support seat (102), and a second support seat (103), wherein the first support seat (102) and the second support seat (103) are vertically distributed and fixed to the outside of the hollow mandrel (101), characterized in that, The bottom end of the first support base (102) and the top end of the second support base (103) are both formed with I-shaped slots (105); The gear assembly (2) includes a gear seat (201), a gear (202), an I-shaped socket (203), and a T-shaped mounting hole (204); The gear (202) is rotatably connected to the bottom side of the gear seat (201), and the I-shaped socket (203) is integrally formed on the top side of the gear seat (201). The gear seat (201) is inserted into the inside of the I-shaped slot (105) through the I-shaped socket (203). The T-shaped mounting hole (204) is opened on the other side of the top of the gear seat (201) and completely penetrates the I-shaped socket (203). The I-shaped slot (105) has a screw hole (106) corresponding to the T-shaped mounting hole (204) inside. The bolt passes through the T-shaped mounting hole (204) and is screwed into the screw hole (106) to realize the connection and fixation between the gear seat (201) and the first support seat (102) and the second support seat (103), thereby realizing the detachable installation of the gear assembly (2). A reinforcing component (3) is provided between the first support base (102) and the second support base (103), and the reinforcing component (3) is used to reinforce the installation of the toothed wheel assembly (2).

2. A multi-stage stepped drill bit according to claim 1, characterized in that, The reinforcement component (3) includes a sealing plate (301) and an L-shaped reinforcement component (302); The sealing disc (301) is slidably sleeved on the outside of the hollow mandrel (101) and fits against the lower surface of the first support base (102) to seal the opening of the I-shaped slot (105) on the first support base (102); Two L-shaped reinforcement members (302) are provided. The two L-shaped reinforcement members (302) are symmetrically distributed and sleeved on the outside of the hollow mandrel (101). The top of the vertical part of the L-shaped reinforcement member (302) is attached to the bottom of the sealing plate (301) to support the sealing plate (301). The lateral portion of the L-shaped reinforcement (302) is attached to the upper surface of the second support (103) to seal the opening of the I-shaped slot (105) on the second support (103).

3. A multi-stage stepped drill bit according to claim 2, characterized in that, The outer wall dimensions of the I-shaped socket (203) match the inner wall dimensions of the I-shaped slot (105), and a plurality of I-shaped slots (105) are provided on the first support base (102) and the second support base (103).

4. A multi-stage stepped drill bit according to claim 3, characterized in that, The bottom of the first support base (102) and the bottom of the second support base (103) are both fixed with nozzles (104) that communicate with the inner cavity of the hollow mandrel (101). The number and position of the nozzles (104) correspond one-to-one with the number and position of the toothed wheel assembly (2), and the port of the nozzle (104) is tilted towards the toothed wheel (202).

5. A multi-stage stepped drill bit according to claim 4, characterized in that, The sealing disc (301) has a clearance notch that matches the number of nozzles (104) on the first support base (102). The sealing disc (301) and the L-shaped reinforcement (302) are connected and fixed to the first support base (102) and the second support base (103) respectively by bolts.

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