Drill bit fishing device for well drilling

Abstract

The invention discloses a drill bit fishing device for well drilling, and belongs to the technical field of well drilling fishing equipment. A drill bit fishing device for well drilling comprises a conical table, a rotary table, a threaded connector, an air exhaust hole and an auxiliary shaft, the threaded connector is arranged at the top of the auxiliary shaft, the conical table used for sealing a threaded cavity of a drill bit is arranged outside the auxiliary shaft, the rotary table is arranged above the conical table, and the air exhaust hole penetrates through the rotary table and the auxiliary shaft. The rotary table is in rotary sealing connection with the auxiliary shaft; the drill bit lifting device has the advantages of being connected with a drill bit more tightly and preventing falling in the lifting process.

Description

Technical Field

[0001] The invention relates to the technical field of drilling and salvaging equipment, and in particular to a drilling drill bit salvaging device. Background Art

[0002] Oil drilling technology occupies an important position in the exploration and development of oil and gas resources in my country, and has broad development space and prospects. Oil drilling is to use a drilling device to drill a circular hole at the surface, enter the underground oil layer, and then use a drill bit to drill. During the construction of drilling, due to the large hole diameter and long construction period, there is a risk of the drill bit falling, or the large hole diameter requires multiple hole expansions. When expanding the hole, a guide drill bit needs to be connected in front of the expansion drill bit. During the long drilling process, the guide drill bit vibrates frequently, and occasionally the drill bit falls into the hole. The existing drill bit salvage equipment grabs the outside of the drill bit, which is not stable enough when grabbing the drill bit, and it is easy to fall during the salvage process, resulting in poor safety and practicality. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the existing drill bit salvaging equipment grabs the outside of the drill bit and is easy to fall off during the salvaging process, and to propose a drill bit salvaging device for drilling.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A drilling bit salvage device comprises a conical table, a turntable, a threaded joint, an air extraction hole and a secondary shaft. The top of the secondary shaft is provided with a threaded joint. The outside of the secondary shaft is provided with a conical table for sealing the threaded cavity of the drill bit. A turntable is provided above the conical table. The air extraction hole passes through the turntable and the secondary shaft. The turntable and the secondary shaft are connected in a rotating seal.

[0005] Furthermore, a conical side wall which is larger at the top and smaller at the bottom is provided at the bottom of the conical platform, and a sealing gasket corresponding to the port of the threaded cavity is embedded in the conical side wall.

[0006] Furthermore, a main shaft is provided at the bottom of the secondary shaft, and the air extraction hole passes through the main shaft; A spring plate is arranged at the bottom of the main shaft, and a grinding block corresponding to the sealing gasket is arranged at the bottom of the spring plate.

[0007] Furthermore, a first step structure is formed between the grinding block and the bottom surface of the spring plate, so that the edge of the grinding block away from the main shaft is lower than the edge of the adjacent spring plate, and the edge of the grinding block close to the main shaft is higher than the edge of the adjacent spring plate.

[0008] Furthermore, a second step structure is formed between the sealing gasket and the bottom surface of the conical side wall, so that the edge of the sealing gasket away from the secondary axis is higher than the edge of the adjacent conical side wall, and the edge of the sealing gasket close to the secondary axis is higher than the edge of the adjacent conical side wall.

[0009] Furthermore, the bottom width of the sealing gasket is greater than the bottom width of the grinding block.

[0010] Furthermore, the end of the spring plate away from the main shaft is provided with a spiral edge corresponding to the thread in the threaded cavity.

[0011] Furthermore, there are a plurality of spring plates, the plurality of spring plates are radially distributed, and the plurality of spiral edges correspond to the threads in the threaded cavity.

[0012] Furthermore, a receiving groove is provided on the circumferential side wall of the turntable, a paddle is provided inside the receiving groove, a rotating shaft is provided at a position of the paddle offset from the center, and the paddle is rotatably installed in the receiving groove along the horizontal direction via the rotating shaft.

[0013] Furthermore, a ball corresponding to the drilling casing is embedded and installed on the side wall of the turntable, and the turntable is slidably installed in the drilling casing through the ball.

[0014] Compared with the prior art, the present invention provides a drilling drill bit fishing device, which has the following beneficial effects: The present invention discloses a drill bit salvaging device for drilling. When in use, the device is connected to a drill rod of a drilling platform through a threaded joint, the drill rod is lowered into the well, the lower part of the conical table is pressed onto the top opening of the threaded cavity of the drill bit, the air in the threaded cavity is extracted through the air extraction hole, a negative pressure environment is formed, the device is connected to the drill bit by utilizing the negative pressure, and then the drill rod is lifted to salvage the drill bit from the well. Compared with the prior art, the connection with the drill bit is more stable, and the risk of the drill bit falling during the salvaging process is reduced.

[0015] Other advantages, objectives and features of the present invention will be described in part in the following description; and in part, will be apparent to those skilled in the art based on an examination of the following; or, may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention from an upper right perspective; Figure 2 It is a schematic diagram of the overall structure of the present invention from a three-dimensional lower right perspective; Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement of part A; Figure 4It is a schematic diagram of the overall structure of the present invention; Figure 5 It is a three-dimensional schematic diagram of the cross-sectional effect of the overall structure of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the structure of part B in the middle is enlarged; Figure 7 For the present invention Figure 5 The enlarged schematic diagram of the structure of part C in the middle; Figure 8 It is a schematic diagram of the overall structural cross-sectional effect of the present invention; Fig. 9 For the present invention Figure 8 The enlarged schematic diagram of the structure of part D in the middle; Fig.10 For the present invention Figure 8 The enlarged schematic diagram of the structure of part E in the middle; Fig.11 It is a three-dimensional schematic diagram of the cross-sectional effect of the turntable structure of the present invention; Fig.12 It is a top view schematic diagram of the cross-sectional effect of the turntable structure of the present invention.

[0017] In the figure: 1. Conical table; 101. Conical side wall; 102. Sealing gasket; 103. Deformation gap; 2. Main shaft; 3. Spring plate; 301. Grinding block; 302. Spiral edge; 4. Turntable; 401. Storage groove; 402. Pick; 403. Rotating shaft; 404. Ball; 5. Threaded joint; 6. Exhaust hole; 601. First through hole; 602. Second through hole; 603. Third through hole; 7. Sub-shaft; 701. Annular connecting groove; 8. Exhaust pipe. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figure 1-12 The present invention discloses a drilling bit salvaging device, comprising a conical table 1, a rotary table 4, a threaded joint 5, an air extraction hole 6, and a secondary shaft 7. The threaded joint 5 is fixedly connected to the top of the secondary shaft 7, and the outside of the secondary shaft 7 is fixedly connected to the conical table 1 for sealing the threaded cavity of the drill bit. The upper part of the conical table 1 is a cylindrical structure, and the lower part is a frustum structure. The outer diameters of the cylindrical structure and the frustum structure are larger than the inner diameter of the threaded cavity, and smaller than the outer diameter of the drill bit.

[0020] A turntable 4 is rotatably installed above the conical table 1. An exhaust hole 6 runs through the turntable 4 and the auxiliary shaft 7. The turntable 4 and the auxiliary shaft 7 are rotatably sealed and connected. The connection method between the turntable 4 and the auxiliary shaft 7 is similar to the internal connection method of the gas-liquid slip ring. An exhaust pipe 8 is connected to the top opening of the turntable 4. The other end of the exhaust pipe 8 is connected to an external vacuum pump. When in use, the exhaust pipe 8 and the device are lowered into the well along with the drill pipe.

[0021] The bottom of the conical platform 1 is a conical side wall 101 with a larger top and a smaller bottom. A sealing gasket 102 corresponding to the port of the threaded cavity is embedded in the conical side wall 101. When the conical side wall 101 is pressed against the top opening of the threaded cavity, the sealing gasket 102 is in sealing contact with the opening edge of the threaded cavity.

[0022] The threaded joint 5, the secondary shaft 7, the rotary table 4, the conical table 1 and the main shaft 2 from top to bottom are all on the same axis.

[0023] The bottom of the secondary shaft 7 is fixedly connected to the main shaft 2, and the air extraction hole 6 passes through the main shaft 2. When in use, the main shaft 2 extends into the threaded cavity; A spring plate 3 is fixedly connected to the bottom of the main shaft 2, and a grinding block 301 corresponding to the sealing gasket 102 is fixedly embedded in the bottom of the spring plate 3. Abrasive particles are fixed on the bottom surface of the grinding block 301. When in use, the threaded joint 5, the secondary shaft 7, the main shaft 2 and the spring plate 3 are driven to rotate by the drill rod, and the grinding block 301 is further driven to grind the opening edge of the threaded cavity, so that the opening edge becomes smooth, thereby ensuring the sealing effect between the opening edge and the sealing gasket 102.

[0024] The exhaust hole 6 includes a first through hole 601 opened inside the main shaft 2, a second through hole 602 opened inside the secondary shaft 7, and a third through hole 603 opened on the turntable 4. The first through hole 601, the second through hole 602, and the third through hole 603 are connected, and the top port of the third through hole 603 is connected to the exhaust pipe 8.

[0025] An annular connecting groove 701 is also machined inside the secondary shaft 7 here, and the second through hole 602 and the third through hole 603 are connected through the annular connecting groove 701. When the turntable 4 and the secondary shaft 7 rotate relative to each other, the third through hole 603 rotates around the annular connecting groove 701, thereby maintaining dynamic connection with the second through hole 602.

[0026] A first step structure is formed between the grinding block 301 and the bottom surface of the spring plate 3, so that the edge of the grinding block 301 away from the spindle 2 is lower than the edge of the adjacent spring plate 3, and the edge of the grinding block 301 close to the spindle 2 is higher than the edge of the adjacent spring plate 3. Figure 8As shown, in the present application, the spring plate 3 is tilted, and the end of the spring plate 3 away from the main shaft 2 is higher than the end of the spring plate 3 close to the main shaft 2. At the same time, the spring plate 3 is an arc-shaped plate, specifically, the end of the spring plate 3 away from the main shaft 2 is further tilted upward.

[0027] The outer diameter of the spring plate 3 in the horizontal direction is slightly larger than the inner diameter of the threaded cavity. When the drill rod drives the spring plate 3 to press against the opening of the threaded cavity, the bottom surface of the grinding block 301 contacts the edge of the opening, and then the drill rod drives the spring plate 3, thereby driving the grinding block 301 to grind the edge of the opening, making the edge of the opening smoother.

[0028] During the rotation of the spring plate 3, a certain pressure can be applied to the spring plate 3 through the drill rod to ensure the grinding effect and grinding progress.

[0029] When the grinding work is completed, further downward pressure is applied through the drill rod to cause the spring plate 3 to deform slightly, and the end of the spring plate 3 away from the main shaft 2 begins to retract toward the main shaft 2, thereby pressing the spring plate 3 into the spring cavity, so that the ground opening edge fits tightly with the sealing gasket 102.

[0030] In such Fig. 9 In the embodiment, a first fan-shaped embedding groove is processed on the bottom surface of the spring plate 3, and a fan-shaped grinding block 301 is installed in the first embedding groove. The edge of the first embedding groove away from the main shaft 2 is higher than the edge of the grinding block 301 away from the main shaft 2, and the edge of the grinding block 301 close to the main shaft 2 is higher than the edge of the first embedding groove close to the main shaft 2, so that the spring plate 3 cooperates with the grinding block 301. After the grinding is completed, when the drill rod is subjected to downward pressure, the grinding block 301 and the bottom surface of the spring plate 3 slide over the opening edge in sequence, and the spring plate 3 can be smoothly gathered along the opening edge toward the main shaft 2 (the height here is high at the top and low at the bottom).

[0031] In the attached Fig. 9 In the further enlarged view located at the top, the edge of the grinding block 301 is convex downward compared to the spring plate 3, while in the further enlarged view located at the bottom, the edge of the grinding block 301 is concave upward compared to the spring plate 3.

[0032] A second step structure is formed between the sealing gasket 102 and the bottom surface of the conical side wall 101, so that the edge of the sealing gasket 102 away from the secondary shaft 7 is higher than the edge of the adjacent conical side wall 101, and the edge of the sealing gasket 102 close to the secondary shaft 7 is higher than the edge of the adjacent conical side wall 101. Fig. 9As shown, a second embedding groove is processed on the conical side wall 101, and an annular sealing gasket 102 is installed in the second embedding groove. The edge of the second embedding groove away from the main shaft 2 is lower than the edge of the sealing gasket 102 away from the main shaft 2 (i.e., the edge at the bottom of the outer wall of the sealing gasket 102), and the edge of the second embedding groove close to the main shaft 2 is lower than the edge of the sealing gasket 102 close to the main shaft 2 (i.e., the edge at the bottom of the inner wall of the sealing gasket 102), so that when the sealing gasket 102 is pressed on the edge of the opening, the inner edge and the outer edge of the second embedding groove are respectively buckled on the inner wall and the top of the threaded cavity from both sides to prevent the sealing gasket 102 from slipping off the edge of the opening.

[0033] In the attached Fig.10 In the two further enlarged views at the top and bottom, the edges of the sealing gasket 102 are both recessed upward compared to the edges of the conical side wall 101 .

[0034] The bottom width of the sealing gasket 102 is greater than the bottom width of the grinding block 301, so that the sealing gasket 102 can completely cover and press on the edge of the opening to ensure the sealing effect.

[0035] Furthermore, a deformation gap 103 is provided between the top of the sealing gasket 102 and the top of the second embedding groove. Fig.10 As shown, the height of the deformation gap 103 away from the main shaft 2 is greater than the height of the end close to the main shaft 2. When the sealing gasket 102 is pressed on the edge of the opening, the sealing gasket 102 can undergo a certain degree of elastic deformation in the deformation gap 103, thereby improving the fit between the sealing gasket 102 and the edge of the opening.

[0036] The end of the spring plate 3 away from the main shaft 2 is processed with a spiral edge 302 corresponding to the thread in the threaded cavity, that is, the spiral edge 302 is a spiral structure, and the spiral trajectory is the same as the spiral trajectory of the thread groove in the threaded cavity. When the drill rod drives the spring plate 3 to rotate, the spiral edge 302 can engage with the thread groove in the threaded cavity, thereby making the clamping connection between the spring plate 3 and the threaded cavity more stable.

[0037] There are multiple spring plates 3, and the multiple spring plates 3 are distributed radially. The multiple spiral edges 302 correspond to the threads in the thread cavity. The spiral edges 302 on the multiple spring plates 3 are on the same spiral trajectory and are the same as the thread trajectory of the thread groove in the thread cavity.

[0038] A receiving groove 401 is provided on the circumferential side wall of the turntable 4. The receiving groove 401 is a groove with an opening toward the outer side of the turntable 4. A paddle 402 is installed inside the receiving groove 401. A rotating shaft 403 is installed at a position off-center of the paddle 402. The paddle 402 is installed in the receiving groove 401 by rotating in a horizontal direction through the rotating shaft 403. Specifically, Figure 11-12 , so that the drill rod drives the device to work as follows Fig.12 When the paddle 402 is rotated in the locking direction indicated by the arrow, the length of the portion of the paddle 402 facing the rotation direction is greater than the length of the portion away from the rotation direction, with the position of the rotating shaft 403 as the boundary.

[0039] When the turntable 4 and the secondary shaft 7 rotate, the rotating shaft 403 is located at an eccentric position on the turntable 4. When the turntable 4 rotates rapidly in the direction of the arrow, the longer end of the paddle 402 will drive the paddle 402 to rotate around the rotating shaft 403 and rotate to the outside of the turntable 4 under the action of inertia and centrifugal force. Then, the end of the paddle 402 located on the outside of the turntable 4 abuts against the inner wall of the drilling casing to prevent the turntable 4 from rotating rapidly, thereby preventing the suction pipe 8 from being torn off due to rapid winding. When the turntable 4 rotates slowly, the paddle 402 does not move, and the air extraction pipe 8 can also rotate slowly along with the turntable 4 (the turntable 4 and the secondary shaft 7 maintain relative rotation) without being torn off.

[0040] A ball 404 corresponding to the drilling casing is embedded and installed on the side wall of the turntable 4, and the turntable 4 is slidably installed in the drilling casing through the ball 404. Specifically, a spherical groove is processed on the outer wall of the turntable 4, and the ball 404 is movably installed in the spherical groove. The ball 404 rotates in the spherical groove. When in use, after the device enters the drilling casing, the ball 404 fits against the inner wall of the sleeve, reducing the shaking amplitude of the device when it moves in the sleeve and improving stability.

[0041] Working principle: When in use, the device is installed on the end of the drilling drill pipe through the threaded joint 5, and is extended into the inside of the drilling well through the drill pipe until it reaches the fallen drill bit. The grinding block 301 on the spring plate 3 first contacts the opening edge of the threaded cavity of the drill bit, and then the drill pipe is controlled to drive the device to rotate. The spring plate 3 drives the grinding block 301 to grind the opening edge of the threaded cavity. After the grinding reaches the predetermined flatness effect, downward pressure is applied to the device through the drill pipe, squeezing the spring plate 3 to undergo elastic deformation, and pressing the main shaft 2 and the spring plate 3 into the threaded cavity.

[0042] After the spring plate 3 just enters the threaded cavity, the spiral edge 302 begins to enter the threaded groove, and then the rotating rod is controlled to apply pressure and rotate again, so that the spiral edge 302 engages with the threaded groove, pulling the device downward, and under the action of the downward pulling force of the spiral edge 302 and the downward pressure of the drill rod, the main shaft 2 gradually enters the threaded cavity.

[0043] When the sealing gasket 102 is pressed against the edge of the opening, the drilling platform detects that the rotation resistance of the drill pipe has increased significantly. At this time, the rotation is stopped and the external vacuum pump is started to extract air from the threaded cavity through the exhaust pipe 8 and the exhaust hole 6, so that the threaded cavity becomes a vacuum negative pressure environment.

[0044] At this time, under the action of negative pressure, the sealing gasket 102 is squeezed more tightly against the edge of the opening, and the rotation of the drill pipe can continue to be controlled, and the spring plate 3 can continue to be driven to rotate, so that the spring plate 3 engages with the threaded groove and continues to spiral downward until the drilling platform detects that the rotational resistance of the drill pipe reaches a predetermined value. At this time, it can be determined that the device and the drill bit are tightly connected, and then the drill pipe is lifted up through the drilling platform, driving the device and the detached drill bit to be fished out of the well together.

[0045] The spring plate 3 is meshed with the thread groove and cooperates with the negative pressure. The dual effect ensures that the device is tightly and stably connected to the drill bit to prevent it from falling during the lifting process.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A drilling bit fishing device, characterized in that: The utility model comprises a conical platform (1), a rotary table (4), a threaded joint (5), an air extraction hole (6), and a secondary shaft (7); the top of the secondary shaft (7) is provided with a threaded joint (5); the outside of the secondary shaft (7) is provided with a conical platform (1) for sealing a threaded cavity of a drill bit; the top of the conical platform (1) is provided with a rotary table (4); the air extraction hole (6) penetrates the rotary table (4) and the secondary shaft (7); and the rotary table (4) and the secondary shaft (7) are connected in a rotationally sealed manner.

2. A drilling bit fishing device according to claim 1, characterized in that: A conical side wall (101) which is larger at the top and smaller at the bottom is provided at the bottom of the conical platform (1), and a sealing gasket (102) corresponding to the port of the threaded cavity is embedded in the conical side wall (101).

3. A drilling bit fishing device according to claim 2, characterized in that: A main shaft (2) is disposed at the bottom of the secondary shaft (7), and the air extraction hole (6) passes through the main shaft (2); A spring plate (3) is provided at the bottom of the main shaft (2), and a grinding block (301) corresponding to the sealing gasket (102) is provided at the bottom of the spring plate (3).

4. A drilling drill bit fishing device according to claim 3, characterized in that: A first step structure is formed between the grinding block (301) and the bottom surface of the spring plate (3), so that the edge of the grinding block (301) away from the main shaft (2) is lower than the edge of the adjacent spring plate (3), and the edge of the grinding block (301) close to the main shaft (2) is higher than the edge of the adjacent spring plate (3).

5. A drilling bit fishing device according to claim 4, characterized in that: A second step structure is formed between the sealing gasket (102) and the bottom surface of the conical side wall (101), so that the edge of the sealing gasket (102) away from the secondary axis (7) is higher than the edge of the adjacent conical side wall (101), and the edge of the sealing gasket (102) close to the secondary axis (7) is higher than the edge of the adjacent conical side wall (101).

6. A drilling bit fishing device according to claim 5, characterized in that: The bottom surface width of the sealing gasket (102) is greater than the bottom surface width of the grinding block (301).

7. A drilling bit fishing device according to claim 3, characterized in that: The end of the spring plate (3) away from the main shaft (2) is provided with a spiral edge (302) corresponding to the thread in the thread cavity.

8. A drilling bit fishing device according to claim 7, characterized in that: There are a plurality of spring plates (3), the plurality of spring plates (3) are distributed radially, and the plurality of spiral edges (302) all correspond to the threads in the thread cavity.

9. A drilling bit fishing device according to claim 1, characterized in that: A receiving groove (401) is provided on the circumferential side wall of the turntable (4), a paddle (402) is arranged inside the receiving groove (401), a rotating shaft (403) is arranged at a position off-center of the paddle (402), and the paddle (402) is rotatably installed in the receiving groove (401) in a horizontal direction via the rotating shaft (403).

10. The drilling bit fishing device according to claim 1, characterized in that: A ball bearing (404) corresponding to the drilling casing is embedded and installed on the side wall of the turntable (4), and the turntable (4) is slidably installed in the drilling casing via the ball bearing (404).

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