A top drive tool for rope coring operations

Abstract

The present invention relates to the technical field of rope coring operations, and in particular to a top drive tool for rope coring operations, which is used in conjunction with a coring top drive and a coring device, wherein the coring top drive includes a coring top drive through-going spindle, and the tool body includes a first valve body, which is connected to the coring top drive through-going spindle; the tool body also includes a sealing unit and a shearing unit, wherein the sealing unit is arranged above the first valve body, and the shearing unit is arranged above the sealing unit, and the middle parts of the first valve body, the sealing unit and the shearing unit can be interconnected, and the three are connected to form a first channel, and the coring device assembly can pass through the first channel. In the present invention, the coring device body is directly lowered and recovered through the top of the top drive tool, without removing the connecting thread between the top drive and the drill pipe column.

Description

Technical Field

[0001] The present invention relates to the technical field of rope coring operations, in particular to a top drive tool used for rope coring operations. Background Art

[0002] During geological drilling or oil well construction, it is often necessary to collect core samples from the borehole. To improve the efficiency of coring and reduce sampling costs, wireline coring is the primary sampling method. When using a top drive as the drilling power drive for wireline coring, the existing top drive lacks a through-hole. To lower or retrieve the wireline coring tool into the drill pipe, it is often necessary to disassemble the threaded connection between the top drive and the drill pipe. This allows the wireline coring tool to bypass the top drive and be lowered from the top of the drill pipe.

[0003] In detail, the top drive structure in the prior art is as follows Figure 4 As shown, the existing top drive is connected to a water hose for transmitting mud, and the top drive main shaft does not pass through the top drive. The upper part of the top drive main shaft is connected to the water hose, and the lower part is connected to the drill pipe. The interior of the top drive main shaft serves as a mud channel, and the outer tube serves as a torque transmission mechanism.

[0004] When the wireline coring tool needs to be salvaged, the connecting thread between the top drive and the drill pipe needs to be disassembled again and the salvage work needs to be carried out from the top of the drill pipe. However, if an underground accident occurs, the top drive cannot be used to handle it conveniently because it is not connected to the drill pipe, which can easily cause an in-hole accident.

[0005] At the same time, since there is no sealing device on the upper part of the drill pipe, when it is necessary to apply pressure to the rope coring tool placed in the well, the wire rope must be recovered after the rope coring tool is lowered to the bottom of the well, the top drive must be reconnected to the drill pipe, and then a mud pump must be used to pressurize the rope coring tool in the well.

[0006] However, the current usage method has the following shortcomings:

[0007] 1. To lower the rope coring tool, the connecting threads between the drill pipe and the top drive need to be disconnected. When the drill pipe and the top drive are disconnected, if an accident occurs in the hole, the top drive cannot be used to handle it conveniently.

[0008] 2. When the wireline coring tool needs to apply pressure, the wireline needs to be lowered and retrieved, the drill pipe and top drive need to be reconnected, and the top drive needs to be used to seal the string. During the operation, the wireline needs to be lowered and retrieved multiple times, which seriously affects the operation efficiency. Summary of the Invention

[0009] The object of the present invention is to solve the problems existing in the prior art and to provide a top drive tool for rope coring operations.

[0010] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0011] A top drive tool for wireline coring operations, used in conjunction with a coring top drive and a coring tool, the coring tool assembly comprising a coring tool and a wire rope connected to each other, the top drive tool comprising a tool body, the coring top drive comprising a coring top drive through-shaft, the tool body comprising a first valve body, the first valve body being connected to the coring top drive through-shaft;

[0012] The tool body further includes a sealing unit and a shearing unit, wherein the sealing unit is arranged above the first valve body, and the shearing unit is arranged above the sealing unit. The first valve body, the sealing unit, and the middle portion of the shearing unit are all interconnected to form a first channel, and the corer assembly can pass through the first channel;

[0013] A top drive connecting flange is connected between the top drive and the first valve body, a first flange is connected between the first valve body and the sealing unit, and a second flange is connected between the sealing unit and the shearing unit.

[0014] As an improvement to the technical solution of the top drive tool for rope coring operations of the present invention, the coring top drive is provided with a through hole, the coring top drive through main shaft is passed through the through hole, the top drive connecting flange is provided at the upper end of the coring top drive through main shaft, and the coring top drive through main shaft is also connected to a water hose.

[0015] As an improvement to the technical solution of the top drive tool for rope coring operation of the present invention, the first valve body is a ball valve having a central through hole and communicating with the first channel.

[0016] As an improvement to the technical solution of the top drive tool for rope coring operations of the present invention, the sealing unit includes a sealing gate valve, which includes a left sealing shell and a right sealing shell respectively arranged on opposite sides of the first channel, a first sealing gate plate is arranged in the left sealing shell, a second sealing gate plate is arranged in the right sealing shell, and a sealing ring is arranged at the front end of the second gate plate. When the first sealing gate plate and the second sealing gate plate are abutted against each other, the sealing ring is deformed, and the sealing ring and the wire rope are tightly combined.

[0017] As an improvement to the technical solution of the top drive tool for rope coring operations of the present invention, the sealing unit further includes a sealing telescopic oil cylinder, a sealing oil cylinder guide rail, and the second flange, the two ends of the sealing oil cylinder guide rail are respectively arranged in the left sealing housing and the right sealing housing, and the sealing oil cylinder guide rail passes through the first channel, the second flange is arranged below the sealing gate valve, and the sealing oil cylinder guide rail, the sealing telescopic oil cylinder, and the second flange are fastened together by through bolts;

[0018] The sealed telescopic oil cylinder includes a sealed piston rod, which is connected to the first sealed gate plate. The first sealed gate plate and the cylinder bottom of the sealed telescopic oil cylinder form an oil chamber, and the first sealed gate plate is driven to move in the sealed telescopic oil cylinder by controlling the hydraulic oil.

[0019] As an improvement to the technical solution of the top drive tool for rope coring operations of the present invention, the shear unit includes a shear gate valve, which includes a left shear shell and a right shear shell respectively arranged on opposite sides of the first channel, a first shear gate is arranged in the left shear shell, and a second shear gate is arranged in the right shear shell. The front ends of the first shear gate and the second shear gate are both tooth-shaped. When the first shear gate and the second shear gate are against each other, the wire rope in the first channel is cut off.

[0020] As an improvement to the technical solution of the top drive tool for rope coring operations of the present invention, the shear unit further includes a shear telescopic oil cylinder, a shear cylinder guide rail, and the second flange, the two ends of the shear cylinder guide rail are respectively arranged in the left shear housing and the right shear housing, and the shear cylinder guide rail passes through the first channel, the second flange is arranged below the shear gate valve, and the shear cylinder guide rail, the shear telescopic oil cylinder, and the second flange are fastened together by through bolts;

[0021] The shear telescopic oil cylinder includes a shear piston rod, which is connected to the first shear gate. The first shear gate and the cylinder bottom of the shear telescopic oil cylinder form an oil chamber, and the first shear gate is driven to move in the shear telescopic oil cylinder by controlling the hydraulic oil.

[0022] As an improvement to the technical solution of the top drive tool for rope coring operation of the present invention, a guide component is provided above the shearing unit, the guide component is trumpet-shaped, and an opening of the guide component is connected to the first channel.

[0023] As an improvement to the technical solution of the top drive tool for rope coring operations of the present invention, the first channel is a linear channel.

[0024] Beneficial effects of the present invention:

[0025] 1. In the present invention, a top drive through-shaft is provided in the coring top drive, which penetrates the coring top drive. A through-shaft forms a through-channel in the coring top drive, so as to facilitate the lowering and recovery of the coring device without removing the connecting thread between the top drive and the drill string.

[0026] 2. In the present invention, when it is necessary to apply pressure to the rope coring tool, the sealing gate valve is closed, and the pressure applied to the coring tool is displayed according to the manifold pressure, thereby avoiding the installation of a cable-type blowout preventer at the wellhead, saving operating efficiency and increasing safety. At the same time, a shear gate is configured for accident handling, cutting the wire rope connected to the coring tool, closing the well passage, and preventing the situation from worsening. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0029] Figure 3 for Figure 1 sectional view of ;

[0030] Figure 4 It is a structural diagram of a top drive in the prior art;

[0031] Figure 5 It is a structural schematic diagram of the coring top drive in the present invention.

[0032] Explanation of reference numerals: 1-guide component; 2-connecting bolt; 3-sealing gate valve; 4-left sealing housing; 5-right sealing housing; 6-first sealing gate plate; 7-sealing telescopic oil cylinder; 8-sealing oil cylinder guide rail; 9-sealing piston rod; 10-second sealing gate plate; 11-first channel; 12-shear gate valve; 13-left shear housing; 14-right shear housing; 15-first shear gate plate; 16-second shear gate plate; 17-shear telescopic oil cylinder ;18- shear cylinder guide rail;19- shear piston rod;20- coring top drive;21- coring top drive through-shaft;22- first valve body;23- wire rope;24- sealing ring;25- coring top drive connecting flange;26- first flange;27- second flange;28- valve body drive cylinder;29- coring device connector;30- coring device;31- conventional top drive;32- top drive main shaft;33- thread;34- drill pipe;35- water hose. DETAILED DESCRIPTION

[0033] In order to make the purpose of the invention, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0034] like Figures 1 to 3 and Figure 5 As shown, a top drive tool for wireline coring operations is used in conjunction with a coring top drive 20 and a coring tool 30. The coring tool 30 assembly includes a coring tool 30 and a wire rope 23 connected to each other. The top drive tool includes a tool body. The coring top drive 20 includes a coring top drive through-shaft 21. The tool body includes a first valve body 22, and the first valve body 22 is connected to the coring top drive through-shaft 21.

[0035] The corer 30 assembly further includes a corer connector 29 , which is connected between the wire rope 23 and the corer 30 to facilitate connection and disassembly of the corer 30 and the wire rope 23 .

[0036] The tool body also includes a sealing unit and a shearing unit. The sealing unit is arranged above the first valve body 22, and the shearing unit is arranged above the sealing unit. The middle parts of the first valve body 22, the sealing unit and the shearing unit can be interconnected. The three are connected to form a first channel 11, and the corer 30 assembly can pass through the first channel 11.

[0037] A coring top drive connection flange 25 is connected between the top drive and the first valve body 22 , a first flange 26 is connected between the first valve body 22 and the sealing unit, and a second flange 27 is connected between the sealing unit and the shearing unit.

[0038] Furthermore, the coring top drive 20 is provided with a through hole, the coring top drive through main shaft 21 is passed through the through hole, the upper end of the coring top drive through main shaft 21 is provided with a coring top drive connecting flange 25, and the coring top drive through main shaft 21 is also connected to a water hose 35.

[0039] In detail, first, Figure 4 As shown, in the conventional top drive 31, its top drive main shaft 32 does not penetrate the conventional top drive 31, and the upper part of the top drive main shaft 32 is connected to the water hose 35, and the lower part is connected to the drill rod 34. The drill rod 34 and the top drive main shaft 32 are connected by a thread 33. When the rope coring tool needs to be salvaged, the connecting thread 33 between the top drive and the drill rod 34 needs to be disassembled again. The interior of the top drive main shaft 32 will serve as a mud channel, and the outer tube will serve as a torque transmission mechanism.

[0040] In the present invention, Figure 5As shown, the coring top drive 20 includes a coring top drive through-shaft 21. The upper and lower ends of the coring top drive through-shaft 21 are connected to a first valve body 22 and a drill pipe 34, respectively. Branches of the coring top drive through-shaft 21 can be connected to a water hose 35, either directly or through a converging or diverting component such as a tee. Furthermore, since the first valve body 22 is connected to the upper end of the coring top drive through-shaft 21, the upper end of the coring top drive through-shaft 21 is sealed by the first valve body 22. When the wireline coring tool needs to be retrieved, there is no need to disassemble the threaded connection 33 between the top drive and the drill pipe 34. Simply open the first valve body 22 to facilitate the lowering of the coring tool 30. The interior of the top drive through-shaft 32 serves as a mud channel, while the outer tube serves as a torque transmission mechanism. Furthermore, the first valve body 22 is connected to a valve drive cylinder 28 to control the opening and closing of the first valve body 22. Preferably, in the present invention, the first valve body 22 is a ball valve, which has a central through hole and is connected to the first channel 11. The effect of opening or sealing the coring top drive 20 is achieved by flipping the ball valve. Moreover, the ball valve has a central hole and can be connected to the first channel 11 to facilitate the lowering and recovery of the coring device 30 assembly.

[0041] Furthermore, in the prior art, when a wireline coring tool needs to apply pressure, the wireline 23 must be lowered and retrieved, the drill pipe 34 reconnected to the conventional top drive 31, and the tubing string sealed using the conventional top drive 31. This repeated lowering and retrieval of the wireline 23 during the operation significantly impacts operational efficiency. In contrast, the present invention utilizes a first valve body 22 connected to the main shaft to seal the coring top drive 20.

[0042] During normal drilling operations, the first valve is closed to maintain normal pressure within the drill pipe 34. Since the first valve body 22, the sealing unit, and the shearing unit are connected at their midpoints to form a first channel 11, during coring operations, the coring tool 30 is lowered through the first channel 11 to the bottom of the hole to facilitate coring. The sealing unit is used to seal the wire rope 23 lowered to the bottom of the hole, allowing pressure to be applied to the coring tool without retrieving the wire rope 23. The shearing unit is used to shear the connecting wire rope 23 in the event of an accident while lowering or retrieving the bottom-hole rope coring drill, ensuring operational safety.

[0043] As a first embodiment of the present invention, the sealing unit includes a sealing gate valve 3, which includes a left sealing shell 4 and a right sealing shell 5 respectively arranged on opposite sides of the first channel 11. A first sealing gate plate 6 is arranged in the left sealing shell 4, and a second sealing gate plate 10 is arranged in the right sealing shell 5. A sealing ring 24 is arranged at the front end of the second gate plate. When the first sealing gate plate 6 and the second sealing gate plate 10 are abutted against each other, the sealing ring 24 is deformed, and the sealing ring 24 and the wire rope 23 are tightly combined.

[0044] Furthermore, the sealing unit further includes a sealing telescopic oil cylinder 7, a sealing oil cylinder guide rail 8, and a second flange 27. The two ends of the sealing oil cylinder guide rail 8 are respectively arranged in the left sealing housing 4 and the right sealing housing 5, and the sealing oil cylinder guide rail 8 passes through the first channel 11. The second flange 27 is arranged below the sealing gate valve 3, and the sealing oil cylinder guide rail 8, the sealing telescopic oil cylinder 7, and the second flange 27 are fastened together by through bolts.

[0045] The sealed telescopic oil cylinder 7 includes a sealed piston rod 9, which is connected to the first sealed gate plate 6. The first sealed gate plate 6 and the cylinder bottom of the sealed telescopic oil cylinder 7 form an oil chamber, and the first sealed gate plate 6 is driven to move in the sealed telescopic oil cylinder 7 by controlling the hydraulic oil.

[0046] Specifically, in the present invention, hydraulic oil is controlled to drive the first sealing gate 6 to move within the sealing telescopic cylinder 7. When the first sealing gate 6 moves within the sealing telescopic cylinder 7, it can contact the second sealing gate 10. At the same time, a sealing ring 24 is provided at the front end of the second gate. When the first sealing gate 6 and the second sealing gate 10 abut against each other, the sealing ring 24 deforms, and the sealing ring 24 and the wire rope 23 are tightly coupled. That is, when the first sealing gate 6 and the second sealing gate 10 abut against each other, the sealing ring 24 is deformed by force, and the wire rope 23 is embedded in the sealing ring 24, that is, the sealing ring 24 is wrapped around the outside of the wire rope 23, achieving a sealing effect in the presence of the wire rope 23. In this way, the first channel 11 is sealed without retrieving the wire rope 23. When the rope coring tool needs to apply pressure, the wire rope 23 does not need to be retrieved. During the operation, the problem of the prior art that the wire rope 23 needs to be lowered and retrieved multiple times, which seriously affects the operation efficiency, is solved.

[0047] That is, in the present invention, the sealing unit is used to achieve a sealing effect on the wrapping of the coring wire rope 23 placed at the bottom of the well, so that the pressure in the well can be maintained when pressure is applied to the well tool without retrieving the wire rope 23. When the present invention is in use, the sealing piston rod 9 moves relative to the sealing cylinder, pushing the sealing piston rod 9 to drive the second sealing gate 10 to gradually approach the first sealing gate 6. When the first sealing gate 6 and the second sealing gate 10 abut against each other, the sealing unit seals the channel, achieving the effect of sealing the channel.

[0048] As a second embodiment of the present invention, the shear unit includes a shear gate valve 12, which includes a left shear shell 13 and a right shear shell 14 respectively arranged on opposite sides of the first channel 11. A first shear gate 15 is arranged in the left shear shell 13, and a second shear gate 16 is arranged in the right shear shell 14. The front ends of the first shear gate 15 and the second shear gate 16 are both tooth-shaped. When the first shear gate 15 and the second shear gate 16 are against each other, the wire rope 23 in the first channel 11 is cut off.

[0049] Furthermore, the shear unit further includes a shear telescopic oil cylinder 17, a shear oil cylinder guide rail 18, and a second flange 27. The two ends of the shear oil cylinder guide rail 18 are respectively arranged in the left shear housing 13 and the right shear housing 14, and the shear oil cylinder guide rail 18 passes through the first channel 11. The second flange 27 is arranged below the shear gate valve 12, and the shear oil cylinder guide rail 18, the shear telescopic oil cylinder 17, and the second flange 27 are fastened together by through bolts.

[0050] The shear telescopic cylinder 17 includes a shear piston rod 19, which is connected to the first shear gate 15. The first shear gate 15 and the cylinder bottom of the shear telescopic cylinder 17 form an oil chamber, and the first shear gate 15 is driven to move in the shear telescopic cylinder 17 by controlling the hydraulic oil.

[0051] Specifically, in the present invention, hydraulic oil is controlled to drive the first shear ram 15 to move within the shear telescopic cylinder 17. When the first shear ram 15 moves within the shear telescopic cylinder 17, it can abut against the second shear ram 16. At the same time, because the front ends of the first and second shear rams 15, 16 are both serrated, when the first and second shear rams 15, 16 abut against each other, the wire rope 23 in the first channel 11 is cut. That is, when the first and second shear rams 15, 16 abut against each other, the action between the serrated first and second shear rams 15, 16 achieves the effect of cutting the wire rope 23. If an accident occurs while lowering or retrieving the bottomhole rope coring drill tool, the connecting wire rope 23 is cut, closing the well channel, preventing the situation from deteriorating and ensuring construction safety.

[0052] That is, in the present invention, through the movement of the shear piston rod 19 relative to the shear telescopic cylinder 17, the shear piston rod 19 is pushed to drive the second shear gate 16 to gradually approach the first shear gate 15. When the first shear gate 15 and the second shear gate 16 are against each other, the shear unit closes the channel, and through the mutual cooperation of the first shear gate 15 and the second shear gate 16, the effect of cutting the wire rope 23 is achieved.

[0053] The shearing and telescopic cylinders 17 in the shearing unit and the sealing and telescopic cylinders 7 in the sealing unit are each integrally formed, with a horizontal through-hole forming the cavity for accommodating the sealing gate plate and a vertical through-hole forming the central through-hole of the tool. A connecting assembly is provided at the rear end to accommodate the shearing piston rod 19 and the sealing piston rod 9, respectively. The shearing and telescopic cylinder guide rails 18 in the shearing unit and the sealing cylinder guide rails 8 in the sealing unit both support the rear assembly of the telescopic cylinders, maintaining their stability.

[0054] A guide component 1 is provided above the shearing unit. The guide component 1 and the shearing unit are connected by a connecting bolt 2. The guide component 1 is trumpet-shaped, and the opening of the guide component 1 is connected to the first channel 11. The guide component 1 can play a good guiding role for the corer 30 assembly entering the first channel 11. That is, the direction of the wire rope 23 can be adjusted by the guide component 1 to ensure that its direction is parallel to the first channel 11, thereby avoiding friction between the wire rope 23 and the inner side wall of the tool body, which affects the service life of the wire rope 23. Furthermore, the first channel 11 is a straight channel, which can facilitate the lowering and recovery of the corer 30 assembly.

[0055] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A top drive tool for rope coring operation, used in conjunction with a coring top drive and a coring tool assembly, wherein the coring tool assembly comprises a coring tool and a wire rope connected to each other, and wherein the top drive tool comprises a tool body, characterized in that: The coring top drive comprises a coring top drive through-going main shaft, and the tool body comprises a first valve body, wherein the first valve body is connected to the coring top drive through-going main shaft; The tool body further comprises a sealing unit and a shearing unit, wherein the sealing unit is arranged above the first valve body, and the shearing unit is arranged above the sealing unit, and the first valve body, the sealing unit and the middle part of the shearing unit can be interconnected to form a first channel, and the coring assembly can pass through the first channel; A top drive connecting flange is connected between the coring top drive and the first valve body, a first flange is connected between the first valve body and the sealing unit, and a second flange is connected between the sealing unit and the shearing unit; The sealing unit includes a sealing gate valve, which includes a left sealing housing and a right sealing housing respectively arranged at opposite sides of the first channel, a first sealing gate plate is arranged in the left sealing housing, a second sealing gate plate is arranged in the right sealing housing, a sealing ring is arranged at the front end of the second sealing gate plate, and when the first sealing gate plate and the second sealing gate plate are abutted against each other, the sealing ring is deformed, and the sealing ring is tightly combined with the steel wire rope; The shear unit includes a shear gate valve, which includes a left shear shell and a right shear shell respectively arranged on opposite sides of the first channel, a first shear gate is arranged in the left shear shell, and a second shear gate is arranged in the right shear shell, and the front ends of the first shear gate and the second shear gate are both tooth-shaped, and when the first shear gate and the second shear gate are against each other, the steel wire rope in the first channel is cut off.

2. The top drive tool for rope coring operation according to claim 1, characterized in that: The coring top drive is provided with a through hole, the coring top drive through main shaft is passed through the through hole, the top drive connecting flange is provided at the upper end of the coring top drive through main shaft, and the coring top drive through main shaft is also connected with a water hose.

3. The top drive tool for wireline coring operation according to claim 1 or 2, characterized in that: The first valve body is a ball valve having a central through hole and connected to the first channel.

4. The top drive tool for rope coring operation according to claim 3, characterized in that: The sealing unit further includes a sealing telescopic oil cylinder, a sealing oil cylinder guide rail and the second flange, the two ends of the sealing oil cylinder guide rail are respectively arranged in the left sealing housing and the right sealing housing, and the sealing oil cylinder guide rail passes through the first channel, the second flange is arranged below the sealing gate valve, and the sealing oil cylinder guide rail, the sealing telescopic oil cylinder and the second flange are fastened and connected by through bolts; The sealed telescopic oil cylinder includes a sealed piston rod, which is connected to the first sealed gate plate. The first sealed gate plate and the cylinder bottom of the sealed telescopic oil cylinder form an oil chamber, and the first sealed gate plate is driven to move in the sealed telescopic oil cylinder by controlling the hydraulic oil.

5. The top drive tool for rope coring operation according to claim 3, characterized in that: The shear unit further includes a shear telescopic oil cylinder, a shear oil cylinder guide rail and the second flange, the two ends of the shear oil cylinder guide rail are respectively arranged in the left shear housing and the right shear housing, and the shear oil cylinder guide rail passes through the first channel, the second flange is arranged below the shear gate valve, and the shear oil cylinder guide rail, the shear telescopic oil cylinder and the second flange are fastened and connected by through bolts; The shear telescopic oil cylinder includes a shear piston rod, which is connected to the first shear gate. The first shear gate and the cylinder bottom of the shear telescopic oil cylinder form an oil chamber, and the first shear gate is driven to move in the shear telescopic oil cylinder by controlling the hydraulic oil.

6. The top drive tool for wireline coring operation according to claim 1, characterized in that: A guide component is arranged above the shearing unit. The guide component is trumpet-shaped, and an opening of the guide component is communicated with the first channel.

7. The top drive tool for wireline coring operation according to claim 1, characterized in that: The first channel is a straight channel.

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