High-strength key groove expander

Abstract

The utility model relates to the technical field of expanders, in particular to a high-strength key groove expander which comprises an upper connector, one side of the upper connector is fixedly connected with a mandrel, one side of the mandrel is fixedly connected with a lower connector, and one side of the mandrel is connected with a sliding sleeve in a sliding mode. The utility model has the advantages that after the welded alloy edge falls off, a worker firstly needs to use a dismounting tool to twist the threaded fastener, the threaded fastener is separated from the sliding sleeve through threaded transmission, and then the arc dismounting plate is pulled until the positioning pin moves out of the positioning hole, so that the arc dismounting plate with the falling alloy edge can be dismounted in time; and then a new arc-shaped dismounting and mounting plate is taken out, the mounting plate is placed in the mounting groove, at the moment, the positioning pin can move into the positioning hole, and finally the positioning pin is fixed through the threaded fastener, so that secondary welding of the alloy edge is not needed, the connection strength of the alloy edge is improved, the whole sliding sleeve does not need to be replaced, and the replacement cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of expanders, in particular to a high-strength keyway expander. Background Art

[0002] A keyway expander is a tool designed to damage the wellbore and is connected to the upper part of the drill collar. The surface of the sliding sleeve of this tool is surfacing-welded with multiple hard alloy cutting edge bands, which can effectively expand the size of the keyway part and is a commonly used tool in the drilling process. The structure of the keyway expander consists of four parts: an upper sub, a sliding sleeve, a mandrel, and a lower sub. The sliding sleeve can move up and down and rotate on the mandrel, and its outer surface is surfacing-welded with spiral hard alloy edges. There are serrated splines at both ends of the sliding sleeve, which can be respectively matched with the splines of the upper sub and the lower sub.

[0003] The existing keyway expanders still have the following deficiencies in actual use: The keyway expander needs to be installed on the drill collar for use during operation. The main component for damaging the keyway is the hard alloy edge, which is generally welded to the outer surface of the sliding sleeve by surfacing welding. When the hard alloy edge hits the hard rock layer, it may fall off, and it is necessary to use a welding machine to weld it to the sliding sleeve in time. Re-welding is time-consuming and laborious in actual use, and the strength of secondary welding is generally low. If the strength is to be ensured, generally the entire sliding sleeve needs to be replaced, which will increase the maintenance cost. Therefore, a high-strength keyway expander is needed to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model aims to solve at least one of the above technical defects.

[0005] To this end, an object of the utility model is to provide a high-strength keyway expander to solve the problems mentioned in the background art and overcome the deficiencies existing in the prior art.

[0006] To achieve the above object, an embodiment of one aspect of the utility model provides a high-strength keyway expander, including an upper sub, one side of the upper sub is fixedly connected with a mandrel, one side of the mandrel is fixedly connected with a lower sub, one side of the mandrel is slidably connected with a sliding sleeve, both the head and the tail ends of the sliding sleeve are fixedly connected with first serrated splines, one side of the sliding sleeve is provided with a disassembly and assembly component, the disassembly and assembly component includes a threaded fastener, one side of the threaded fastener is rotatably connected with a mounting plate, one side of the mounting plate is fixedly connected with an arc-shaped disassembly and assembly plate, an alloy edge is welded on one side of the arc-shaped disassembly and assembly plate, an assembly plate is fixedly connected to the edge of the arc-shaped disassembly and assembly plate, and a positioning pin is fixedly connected to one side of the arc-shaped disassembly and assembly plate.

[0007] Preferably, according to any of the above solutions, second serrated splines are fixedly connected to one side of the upper joint and the lower joint, and the second serrated splines are engaged with the first serrated splines. A threaded hole is formed in one side of the sliding sleeve, and the thread pitch of the threaded hole is adapted to the thread pitch of the threaded fastener. A positioning hole is formed in one side of the sliding sleeve, and the diameter of the positioning hole is equal to the diameter of the positioning pin. The technical effect that can be achieved by adopting the above solution is that when performing the keyway expansion operation, first, the expander needs to be installed on the drill collar. Due to the self-weight of the sliding sleeve, the splines of the lower joint and the sliding sleeve are engaged. The tool rotates with the drill string. When reaching the keyway position, the sliding sleeve is blocked and engaged with the splines of the upper joint. Pressing and rotating forward can generate a downward shock effect, forcing the sliding sleeve to be stuck in the keyway. At this time, a certain pushing and pulling force is used to rotate forward to engage the splines of the lower joint and the sliding sleeve. The alloy edges on the outer surface of the sliding sleeve cut the keyway, thereby damaging the keyway. When the welded alloy edges fall off, first, a disassembly and assembly tool needs to be used to twist the threaded fastener to disengage it from the sliding sleeve through thread transmission. Subsequently, the arc-shaped disassembly and assembly plate is pulled until the positioning pin moves out of the positioning hole, and then it can be disassembled. The arc-shaped disassembly and assembly plate with the fallen alloy edges can be disassembled in time.

[0008] Preferably, according to any of the above solutions, an installation groove is formed in one side of the sliding sleeve, and the shape and size of the installation groove are adapted to those of the installation plate. An assembly groove is formed in one side of the arc-shaped disassembly and assembly plate, and the shape and size of the assembly groove are adapted to those of the assembly plate. The technical effect that can be achieved by adopting the above solution is that then, a new arc-shaped disassembly and assembly plate is taken out and the installation plate is placed into the installation groove. At this time, the positioning pin will move into the positioning hole, and finally, it is fixed through the threaded fastener. Not only does it not require secondary welding of the alloy edges, improving the connection strength of the alloy edges, but also it does not require replacement of the entire sliding sleeve, saving the replacement cost.

[0009] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0010] Through the cooperative setting among the upper joint, the mandrel, the lower joint, the sliding sleeve, the first serrated spline, the disassembly and assembly member, and the second serrated spline, when the welded alloy edges fall off, first, a disassembly and assembly tool is used to twist the threaded fastener to disengage it from the sliding sleeve through thread transmission. Subsequently, the arc-shaped disassembly and assembly plate is pulled until the positioning pin moves out of the positioning hole, and then it can be disassembled. The arc-shaped disassembly and assembly plate with the fallen alloy edges can be disassembled in time. Then, a new arc-shaped disassembly and assembly plate is taken out and the installation plate is placed into the installation groove. At this time, the positioning pin will move into the positioning hole, and finally, it is fixed through the threaded fastener. Not only does it not require secondary welding of the alloy edges, improving the connection strength of the alloy edges, but also it does not require replacement of the entire sliding sleeve, saving the replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the assembly of the present utility model;

[0012] Figure 2 This is a schematic structural view of the disassembly and assembly component of the present utility model;

[0013] Figure 3 This is a schematic structural view of the sliding sleeve of the present utility model;

[0014] Figure 4 This is a schematic structural view of the first perspective of the arc-shaped disassembly and assembly plate of the present utility model;

[0015] Figure 5 This is a schematic structural view of the second perspective of the arc-shaped disassembly and assembly plate of the present utility model.

[0016] In the figure: 1 - upper joint, 2 - mandrel, 3 - lower joint, 4 - sliding sleeve, 5 - first serrated jaw coupling, 6 - disassembly and assembly component, 601 - threaded fastener, 602 - mounting plate, 603 - arc-shaped disassembly and assembly plate, 604 - alloy edge, 605 - assembly plate, 606 - positioning pin, 7 - second serrated jaw coupling, 8 - threaded hole, 9 - positioning hole, 10 - mounting groove, 11 - assembly groove. Specific embodiments

[0017] The following further describes the present utility model in conjunction with the accompanying drawings, but the protection scope of the present utility model is not limited to the following.

[0018] As Figures 1 to 5 shown, a high-strength keyway expander includes an upper joint 1. One side of the upper joint 1 is fixedly connected to a mandrel 2. One side of the mandrel 2 is fixedly connected to a lower joint 3. One side of the mandrel 2 is slidably connected to a sliding sleeve 4. Both the head and the tail ends of the sliding sleeve 4 are fixedly connected to a first serrated jaw coupling 5. One side of the sliding sleeve 4 is provided with a disassembly and assembly component 6. The disassembly and assembly component 6 includes a threaded fastener 601. One side of the threaded fastener 601 is rotatably connected to a mounting plate 602. One side of the mounting plate 602 is fixedly connected to an arc-shaped disassembly and assembly plate 603. One side of the arc-shaped disassembly and assembly plate 603 is welded with an alloy edge 604. The edge of the arc-shaped disassembly and assembly plate 603 is fixedly connected to an assembly plate 605. One side of the arc-shaped disassembly and assembly plate 603 is fixedly connected to a positioning pin 606.

[0019] As an alternative technical solution of the present utility model, second serrated jaw couplings 7 are fixedly connected to one side of the upper joint 1 and the lower joint 3 respectively, and the second serrated jaw couplings 7 are engaged with the first serrated jaw couplings 5. A threaded hole 8 is provided on one side of the sliding sleeve 4, and the thread pitch of the threaded hole 8 is adapted to the thread pitch of the threaded fastener 601. A positioning hole 9 is provided on one side of the sliding sleeve 4, and the diameter of the positioning hole 9 is equal to the diameter of the positioning pin 606. When the welded alloy edge 604 falls off, first, a disassembly and assembly tool is needed to twist the threaded fastener 601, and through threaded transmission, it is disengaged from the sliding sleeve 4. Then, the arc-shaped disassembly and assembly plate 603 is pulled until the positioning pin 606 moves out of the positioning hole 9, and then the arc-shaped disassembly and assembly plate 603 with the fallen alloy edge 604 can be disassembled in time.

[0020] As an alternative technical solution of the present utility model, an installation groove 10 is provided on one side of the sliding sleeve 4, and the shape and size of the installation groove 10 are adapted to those of the installation plate 602. An assembly groove 11 is provided on one side of the arc-shaped disassembly and assembly plate 603, and the shape and size of the assembly groove 11 are adapted to those of the assembly plate 605. Take out a new arc-shaped disassembly and assembly plate 603 and place the installation plate 602 into the installation groove 10. At this time, the positioning pin 606 will move into the positioning hole 9, and finally, it can be fixed by the threaded fastener 601.

[0021] A high-strength keyway expander has the following working principle:

[0022] 1): When carrying out the keyway expansion operation, first, the expander needs to be installed on the drill collar. Due to the self-weight of the sliding sleeve 4, the jaw couplings of the lower joint 3 and the sliding sleeve 4 are engaged. The tool rotates with the drill string. When it reaches the keyway position, the sliding sleeve 4 is blocked and engaged with the jaw couplings of the upper joint 1. By applying pressure and rotating forward, a downward shock effect can be generated, forcing the sliding sleeve to be stuck in the keyway. At this time, a certain pushing and pulling force is used to rotate forward, so that the jaw couplings of the lower joint 3 and the sliding sleeve 4 are engaged, and the alloy edges 604 on the outer surface of the sliding sleeve 4 cut the keyway, thus destroying the keyway.

[0023] 2): When the welded alloy edge 604 falls off, first, a disassembly and assembly tool is needed to twist the threaded fastener 601, and through threaded transmission, it is disengaged from the sliding sleeve 4. Then, the arc-shaped disassembly and assembly plate 603 is pulled until the positioning pin 606 moves out of the positioning hole 9, and then the arc-shaped disassembly and assembly plate 603 with the fallen alloy edge 604 can be disassembled in time.

[0024] 3): Take out a new arc-shaped disassembly and assembly plate 603 and place the installation plate 602 into the installation groove 10. At this time, the positioning pin 606 will move into the positioning hole 9, and finally, it can be fixed by the threaded fastener 601.

[0025] In summary, the high-strength keyway expander is arranged through the matching arrangement between the upper joint 1, the spindle 2, the lower joint 3, the sleeve 4, the first serrated tooth embedment 5, the disassembly component 6 and the second serrated tooth embedment 7. When the welded alloy edge 604 falls off, it is first necessary to use a disassembly tool to twist the threaded fastener 601 to disengage it from the sleeve 4 through threaded transmission, and then pull the arc-shaped disassembly plate 603 until the locating pin 606 moves out of the locating hole 9. The arc-shaped disassembly plate 603 with the fallen alloy edge 604 can be disassembled in time, and then a new arc-shaped disassembly plate 603 is taken out and the mounting plate 602 is placed into the mounting groove 10. At this time, the locating pin 606 will move into the locating hole 9, and finally it can be fixed by the threaded fastener 601. Not only does it not need to be re-welded to the alloy edge 604, thereby improving the connection strength of the alloy edge 604, but it also does not need to replace the entire sleeve 4, thereby saving replacement costs.

Claims

1. A high-strength keyway expander, characterized in that: The invention comprises an upper joint (1), one side of the upper joint (1) is fixedly connected to a spindle (2), one side of the spindle (2) is fixedly connected to a lower joint (3), one side of the spindle (2) is slidably connected to a sleeve (4), both ends of the sleeve (4) are fixedly connected to first sawtooth-shaped teeth (5), one side of the sleeve (4) is provided with a disassembly component (6), the disassembly component (6) comprises a threaded fastener (601), one side of the threaded fastener (601) is rotatably connected to a mounting plate (602), one side of the mounting plate (602) is fixedly connected to an arc-shaped disassembly plate (603), one side of the arc-shaped disassembly plate (603) is welded with an alloy edge (604), the edge of the arc-shaped disassembly plate (603) is fixedly connected to an assembly plate (605), and one side of the arc-shaped disassembly plate (603) is fixedly connected to a positioning pin (606).

2. A high-strength keyway expander according to claim 1, characterized in that: One side of the upper joint (1) and the lower joint (3) is fixedly connected with a second sawtooth-shaped tooth insert (7), and the second sawtooth-shaped tooth insert (7) is meshed with the first sawtooth-shaped tooth insert (5).

3. A high-strength keyway expander according to claim 2, characterized in that: A threaded hole (8) is provided on one side of the sliding sleeve (4), and the thread pitch of the threaded hole (8) matches the thread pitch of the threaded fastener (601).

4. A high-strength keyway expander according to claim 3, characterized in that: A positioning hole (9) is provided on one side of the sliding sleeve (4), and the diameter of the positioning hole (9) is equal to the diameter of the positioning pin (606).

5. A high-strength keyway expander according to claim 4, characterized in that: A mounting groove (10) is provided on one side of the sliding sleeve (4), and the mounting groove (10) is adapted in shape and size to the mounting plate (602).

6. A high-strength keyway expander according to claim 5, characterized in that: An assembly groove (11) is provided on one side of the arc-shaped disassembly and assembly plate (603), and the assembly groove (11) is adapted in shape and size to the assembly plate (605).

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