A drill string fusing device applicable to a subsea drill

Abstract

The present invention discloses a drill tool fusing device applicable to a subsea drill rig, which includes a connecting shaft. The power output end is connected to the drill tool through the connecting shaft. A pressure-resistant cabin is fixedly arranged on the connecting shaft. The pressure-resistant cabin is connected with a pressure compensator. A concentrated hydrochloric acid container, a concentrated nitric acid container, a power supply and a sealed corrosion chamber fixedly sleeved on the connecting shaft are arranged in the pressure-resistant cabin. The corrosion chamber is formed by a partial outer wall of the connecting shaft and a corrosion chamber housing. The concentrated hydrochloric acid container and the concentrated nitric acid container are respectively communicated with the corrosion chamber through pipelines. An electromagnetic valve is arranged on each of the pipelines between the concentrated hydrochloric acid container and the corrosion chamber and between the concentrated nitric acid container and the corrosion chamber. A switch button for simultaneously opening and closing the two electromagnetic valves is arranged on the outer wall of the pressure-resistant cabin; the flow rate ratio of the concentrated hydrochloric acid pipeline to the concentrated nitric acid pipeline is 3:1; the inner wall of the corrosion chamber housing is coated with polytetrafluoroethylene paint. The present invention can realize the separation of the subsea drill rig and the drill tool.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to a drilling tool melting device suitable for a seabed drilling rig. Background Art

[0002] A subsea drilling rig is a type of drilling equipment that works alone on the seabed. Depending on the drilling requirements, the depth of seawater in which the subsea drilling rig works varies greatly, from a few hundred meters to a few thousand meters or even tens of thousands of meters. Usually, the subsea drilling rig is carried on a mother ship, such as a scientific research ship. When the mother ship arrives at the designated location, the drilling rig is lowered to the seabed through the retractable system on the mother ship's deck, including winches, A-frames and other components. The control room of the subsea drilling rig is installed on the mother ship's deck. The channel connecting the control room and the subsea drilling rig is the umbilical cable. The umbilical cable is responsible for the lowering and recovery of the drilling rig, as well as the transmission of power, control signals and related data. Professional cameras are installed at key parts of the subsea drilling rig, and video data can be directly transmitted to the display screen in the control room. Operators can remotely control the drilling rig to work in the control room on the mother ship's deck.

[0003] When drilling, the submarine drilling rig sometimes encounters various emergencies, such as failure of the hydraulic system, collapse in the hole, buried drill, etc. These emergencies will make it impossible to disassemble the drill tool, and the drilling rig can only be recovered through the umbilical cable. However, to recover the drilling rig, the drilling rig must be disconnected from the drill tool. Once the drill tool and the drilling rig cannot be disconnected, the drilling rig cannot be recovered and can only be discarded. The drilling rig and the drill tool are often connected together by transmission. Even if the operator dives to the seabed, it is difficult to perform the separation operation, and it is difficult to separate the drilling rig and the drill tool. Summary of the invention

[0004] The purpose of the present invention is to provide a drill tool melting device suitable for a submarine drilling rig to solve the problems existing in the above-mentioned prior art and realize the separation of the submarine drilling rig and the drill tool to facilitate the recovery of the submarine drilling rig.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a drill tool fusing device applicable to a subsea drill, including a connecting shaft. The power output end is connected to the drill tool through the connecting shaft. A pressure-resistant cabin is fixedly arranged on the connecting shaft. The pressure-resistant cabin is connected with a pressure compensator. A concentrated hydrochloric acid container, a concentrated nitric acid container, a power supply, and a sealed corrosion chamber fixedly sleeved on the connecting shaft are fixedly arranged in the pressure-resistant cabin. The corrosion chamber is formed by the partial outer wall of the connecting shaft and the corrosion chamber housing. The concentrated hydrochloric acid container and the concentrated nitric acid container are respectively communicated with the corrosion chamber through pipelines. An electromagnetic valve is arranged on the pipeline between the concentrated hydrochloric acid container and the corrosion chamber and on the pipeline between the concentrated nitric acid container and the corrosion chamber. A switch button for simultaneously opening and closing the two electromagnetic valves is arranged on the outer wall of the pressure-resistant cabin. The electromagnetic valves and the switch button are respectively electrically connected to the power supply, and the electromagnetic valves are electrically connected to the switch button. The flow rate ratio of the pipeline between the concentrated hydrochloric acid container and the corrosion chamber to the flow rate of the pipeline between the concentrated nitric acid container and the corrosion chamber is 3:1. The inner wall of the corrosion chamber housing is coated with polytetrafluoroethylene paint.

[0007] Preferably, the connecting shaft includes a transmission main shaft connected to the power output end at one end and a transition joint connected to the drill tool at one end. The other end of the transition joint is connected to the other end of the transmission main shaft. The pressure-resistant cabin and the corrosion chamber are both arranged on the transmission main shaft.

[0008] Preferably, one end of the transition joint penetrates into the transmission main shaft and is threadedly connected to the transmission main shaft. The outer wall of the transmission main shaft forming the corrosion chamber includes the outer wall of the threaded connection section of the transmission main shaft and the transition joint.

[0009] Preferably, the length of the outer wall of the transmission main shaft forming the corrosion chamber is greater than the length of the threaded connection section of the transmission main shaft and the transition joint.

[0010] Preferably, a gland is hermetically connected to one end of the pressure-resistant cabin. A first support plate and a second support plate are fixedly arranged in the pressure-resistant cabin. The concentrated hydrochloric acid container and the concentrated nitric acid container are both arranged on the first support plate. The first support plate is closer to the gland than the second support plate. A partition is arranged between the second support plate and the other end of the pressure-resistant cabin. The corrosion chamber housing is formed by the partition, a part of the second support plate, and a part of the pressure-resistant cabin.

[0011] Preferably, a sealing ring is clamped between the gland and the pressure-resistant cabin.

[0012] The present invention has achieved the following technical effects compared with the prior art:

[0013] The drill tool fusing device applicable to the subsea drill rig of the present invention can separate the subsea drill rig from the drill tool, facilitating the recovery of the subsea drill rig. When the drill tool fusing device applicable to the subsea drill rig of the present invention works, concentrated hydrochloric acid and concentrated nitric acid are injected into the corrosion chamber in a ratio of 3:1, so that aqua regia is formed in the corrosion chamber. Aqua regia can corrode the threaded connection section between the transmission main shaft and the adapter, thereby disconnecting the transmission main shaft from the adapter and realizing the separation of the subsea drill rig from the drill tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Structural schematic of the drill tool fusing device applicable to the subsea drill rig of the present invention Figure 1 ;

[0016] Figure 2 Structural schematic of the drill tool fusing device applicable to the subsea drill rig of the present invention Figure 2 ;

[0017] Wherein: 1. Transmission main shaft; 2. gland; 3. sealing ring; 4. concentrated hydrochloric acid container; 5. concentrated nitric acid container; 6. first support plate; 7. pressure-resistant cabin; 8. power supply; 9. second support plate; 10. electric wire; 11. switch button; 12. concentrated nitric acid pipeline; 13. partition board; 14. adapter; 15. solenoid valve; 16. concentrated hydrochloric acid pipeline; 17. pressure compensator; 18. corrosion chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0019] The purpose of the present invention is to provide a drill tool fusing device applicable to a subsea drill rig to solve the problems existing in the above-mentioned prior art, realize the separation of the subsea drill rig from the drill tool, and facilitate the recovery of the subsea drill rig.

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0021] AsFigures 1 to 2 As shown in the figure: This embodiment provides a drill string fusing device applicable to a subsea drill rig, which includes a connecting shaft. The power output end is connected to the drill string through the connecting shaft. A pressure-resistant cabin 7 is fixedly arranged on the connecting shaft. The pressure-resistant cabin 7 is connected with a pressure compensator 17, and the pressure compensator 17 is used to compensate the pressure of seawater; A concentrated hydrochloric acid container 4, a concentrated nitric acid container 5, a power supply 8, and a sealed corrosion chamber 18 fixedly sleeved on the connecting shaft are arranged in the pressure-resistant cabin 7. The corrosion chamber 18 is formed by the partial outer wall of the connecting shaft and the shell of the corrosion chamber 18. The concentrated hydrochloric acid container 4 is communicated with the corrosion chamber 18 through a concentrated hydrochloric acid pipeline 16, and the concentrated nitric acid container 5 is respectively communicated with the corrosion chamber 18 through a concentrated nitric acid pipeline 12; An electromagnetic valve 15 is arranged on both the concentrated hydrochloric acid pipeline 16 and the concentrated nitric acid pipeline 12. A switch button 11 for simultaneously opening and closing the two electromagnetic valves 15 is arranged on the outer wall of the pressure-resistant cabin 7. The electromagnetic valve 15 and the switch button 11 are respectively electrically connected to the power supply 8 through electric wires 10, and the electromagnetic valve 15 is electrically connected to the switch button 11 through the electric wire 10; In this embodiment, a storage battery is used as the power supply 8.

[0022] The flow rate ratio of the concentrated hydrochloric acid pipeline 16 to the concentrated nitric acid pipeline 12 is 3∶1; The inner wall of the shell of the corrosion chamber 18 is coated with polytetrafluoroethylene coating. Coating the polytetrafluoroethylene coating can prevent the shell of the corrosion chamber 18 from being corroded by aqua regia.

[0023] In this embodiment, the connecting shaft includes a transmission main shaft 1 with one end connected to the power output end and a transition joint 14 with one end connected to the drill string. The other end of the transition joint 14 is connected to the other end of the transmission main shaft 1; The pressure-resistant cabin 7 and the corrosion chamber 18 are both arranged on the transmission main shaft 1.

[0024] One end of the transition joint 14 penetrates into the transmission main shaft 1 and is threadedly connected to the transmission main shaft 1; The outer wall of the transmission main shaft 1 forming the corrosion chamber 18 includes the outer wall of the threaded connection section of the transmission main shaft 1 and the transition joint 14. In this embodiment, one end of the pressure-resistant cabin 7 is hermetically connected with a gland 2, and a sealing ring 3 is clamped between the gland 2 and the pressure-resistant cabin 7. A first support plate 6 and a second support plate 9 are fixedly arranged in the pressure-resistant cabin 7. The concentrated hydrochloric acid container 4 and the concentrated nitric acid container 5 are both arranged on the first support plate 6. The first support plate 6 is closer to the gland 2 than the second support plate 9. A partition plate 13 is arranged between the second support plate 9 and the other end of the pressure-resistant cabin 7; The shell of the corrosion chamber 18 is composed of the partition plate 13, a part of the second support plate 9, and a part of the pressure-resistant cabin 7.

[0025] The working principle of the drill string fusing device applicable to the subsea drill rig in this embodiment is as follows:

[0026] ​Activate the switch button 11 on the pressure-resistant cabin 7 through the ROV (work-class underwater robot) standardly equipped on the ocean drilling ship or geological survey ship. The switch button 11 simultaneously opens the solenoid valves 15 on the concentrated hydrochloric acid pipeline 16 and the concentrated nitric acid pipeline 12, so that concentrated hydrochloric acid and concentrated nitric acid are injected into the corrosion chamber 18 in a ratio of 3:1. The concentrated hydrochloric acid and concentrated nitric acid entering the corrosion chamber 18 are mixed in the corrosion chamber 18 to form aqua regia, which can corrode the threaded connection section of the transmission main shaft 1 and the adapter 14, thereby disconnecting the transmission main shaft 1 and the adapter 14 and realizing the separation of the subsea drill and the drill string.

[0027] It should be noted that the length of the outer wall of the transmission main shaft 1 constituting the corrosion chamber 18 is greater than the length of the threaded connection section of the transmission main shaft 1 and the adapter 14; and the outer wall of the threaded connection section of the transmission main shaft 1 and the adapter 14 is preferably arranged in a relatively lower area in the top view chamber, so that aqua regia can preferentially corrode the threaded connection section of the transmission main shaft 1 and the adapter 14. The wall thickness of the threaded connection section of the transmission main shaft 1 and the adapter 14 is relatively thin, and after the threaded connection section of the transmission main shaft 1 and the adapter 14 is corroded, the connection between the transmission main shaft 1 and the adapter 14 can be naturally disconnected without the adapter 14 being corroded.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] Specific examples are used in this specification to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A drill tool fusing device applicable to a subsea drill rig, characterized in that: It includes a connecting shaft, and the power output end is connected to the drill tool through the connecting shaft. A pressure-resistant cabin is fixedly arranged on the connecting shaft, and the pressure-resistant cabin is connected with a pressure compensator. A concentrated hydrochloric acid container, a concentrated nitric acid container, a power supply, and a sealed corrosion chamber fixedly sleeved on the connecting shaft are fixedly arranged in the pressure-resistant cabin. The corrosion chamber is formed by a part of the outer wall of the connecting shaft and the corrosion chamber housing. The concentrated hydrochloric acid container and the concentrated nitric acid container are respectively communicated with the corrosion chamber through pipelines. An electromagnetic valve is arranged on the pipeline between the concentrated hydrochloric acid container and the corrosion chamber and on the pipeline between the concentrated nitric acid container and the corrosion chamber. A switch button for simultaneously opening and closing the two electromagnetic valves is arranged on the outer wall of the pressure-resistant cabin. The electromagnetic valve and the switch button are respectively electrically connected to the power supply, and the electromagnetic valve is electrically connected to the switch button; the flow rate ratio of the pipeline between the concentrated hydrochloric acid container and the corrosion chamber to the pipeline between the concentrated nitric acid container and the corrosion chamber is 3:1; the inner wall of the corrosion chamber housing is coated with polytetrafluoroethylene coating.

2. The drill tool fusing device applicable to a subsea drill rig according to claim 1, characterized in that: The connecting shaft includes a transmission main shaft with one end connected to the power output end and a transition joint with one end connected to the drill tool. The other end of the transition joint is connected to the other end of the transmission main shaft; the pressure-resistant cabin and the corrosion chamber are both arranged on the transmission main shaft.

3. The drill tool fusing device applicable to a subsea drill rig according to claim 2, characterized in that: One end of the transition joint penetrates into the transmission main shaft and is threadedly connected to the transmission main shaft; the outer wall of the transmission main shaft forming the corrosion chamber includes the outer wall of the threaded connection section of the transmission main shaft and the transition joint.

4. The drill tool fusing device applicable to a subsea drill rig according to claim 3, characterized in that: The length of the outer wall of the transmission main shaft forming the corrosion chamber is greater than the length of the threaded connection section of the transmission main shaft and the transition joint.

5. The drill tool fusing device applicable to a subsea drill rig according to claim 1, characterized in that: One end of the pressure-resistant cabin is hermetically connected with a gland. A first support plate and a second support plate are fixedly arranged in the pressure-resistant cabin. The concentrated hydrochloric acid container and the concentrated nitric acid container are both arranged on the first support plate. The first support plate is closer to the gland than the second support plate. A partition is arranged between the second support plate and the other end of the pressure-resistant cabin; the corrosion chamber housing is composed of the partition, a part of the second support plate, and a part of the pressure-resistant cabin.

6. The drill tool fusing device applicable to a subsea drill rig according to claim 5, characterized in that: A sealing ring is clamped between the gland and the pressure-resistant cabin.

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