Retraction device, mud buffer system and operation method thereof

Abstract

The present invention discloses a retractable device, a mud buffer system and an operating method thereof, which relate to the field of underwater drilling technology, and include: a retractable member and a retractable tool, the retractable member is used to be fixedly connected to the buffer device body, a plurality of clamping structures are provided on the retractable member, the clamping structure includes an introduction groove and two clamping grooves, the upper end of the introduction groove is used to penetrate with the top of the buffer device body, the two clamping grooves are respectively provided on both sides of the introduction groove, the clamping groove includes a slide groove, the slide groove is used to extend along the circumference of the buffer device body, and one end of each of the two slide grooves is penetrated with the lower end of the introduction groove, the retractable tool includes a retractable core and a drill rod, the retractable core and the drill rod are fixedly connected in the circumferential direction of the retractable core, a plurality of clamping joints that can correspond to the position of the clamping structure are provided in the circumferential direction of the retractable core, and the clamping joints can form a clamping connection with the clamping structure. The retractable device, mud buffer system and operating method thereof provided by the present invention can be easily lowered and recovered, and are safer.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater drilling, and in particular to a retracting and extending device, a mud buffer system and an operating method thereof. Background Art

[0002] The mud buffer system is a device that relies on high- and low-pressure wellheads in the oil and gas industry and is primarily used to hold mud containing cuttings. The mud buffer system is generally assembled on the deck and lowered to the bottom of the water using a dedicated delivery tool. After drilling is completed, it is recovered using a dedicated salvage tool. The entire process requires consideration of multiple working conditions and the stress conditions of each structure. The operation is relatively complex and the safety is low, making it difficult to meet the needs of lowering and recovering the mud buffer system. Therefore, there is an urgent need for a retractable device, mud buffer system, and operating method that are easier to lower and recover and safer. Summary of the Invention

[0003] The purpose of the present invention is to provide a retractable device, a mud buffer system and an operating method thereof, so as to solve the problems existing in the above-mentioned prior art, facilitate lowering and recovery, and be safer.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a retractable device, comprising: a retractable part and a retractable tool, the retractable part being used to be fixedly connected to the cache device body, the retractable part being provided with a plurality of clamping structures, the clamping structure comprising an inlet groove and two clamping grooves, the inlet groove being vertically arranged, the upper end of the inlet groove being used to communicate with the top end of the cache device body, the two clamping grooves being respectively arranged on both sides of the inlet groove, the clamping groove comprising a slide groove, the slide groove being used to extend along the circumference of the cache device body, and each end of the two slide grooves being connected with the lower end of the inlet groove, the retractable tool comprising a retractable core and a drill rod, the retractable core being fixedly connected to the drill rod in the circumferential direction of the retractable core, and a plurality of clamping joints which can correspond to the position of the clamping structure are provided in the circumferential direction of the retractable core, and the clamping joints can form a clamping connection with the clamping structure.

[0006] Preferably, the snap-in slot further comprises a snap-in slot, which is vertically arranged, and one end of each of the two snap-in slots is respectively connected to the end of each of the two snap-in slots away from the introduction slot, and the other end of each of the two snap-in slots is closed.

[0007] Preferably, it also includes a limiting pin, a plurality of first positioning parts are fixedly connected to the outer side of the retractable part, each of the positioning parts is provided with a first axial hole, each of the first axial holes corresponds to the position of one of the snap-in slots, a second positioning part is fixedly connected to the side surface of the retractable core, a second axial hole is provided on the second positioning part, the second axial hole can rotate with the rotation of the retractable core so that the second axial hole corresponds to the position of any one of the first axial holes, and the limiting pin can be inserted into a second axial hole and a first axial hole of corresponding positions at the same time.

[0008] The present invention also provides a mud cache system, comprising the above-mentioned retractable device and a cache device body, wherein the retractable member is fixedly connected to the cache device body, and the retractable core is used to recover the cache device body from water and lower it into water.

[0009] Preferably, the cache device body includes an upper cylinder, a lower cylinder and a mud pad, the retractable part is annular, the upper end of the upper cylinder is used to be fixedly connected to the lower end of the retractable part, the lower end of the upper cylinder is detachably connected to the upper end of the lower cylinder, the lower end of the lower cylinder is fixedly connected to the mud pad, the lower side of the mud pad is used to contact the bottom of the water, the inner side surfaces of the retractable part, the upper cylinder and the lower cylinder are all cylindrical, and each of the clamping structures is arranged on the inner side of the retractable part in sequence along the circumference of the retractable part.

[0010] Preferably, the outer side surface of the retractable core is a cylinder, and each of the clamping joints is fixedly connected to the outer side surface of the retractable core in sequence along the circumference of the retractable core; the retractable tool also includes an upper return tube and a connecting piece, the upper return tube is connected to the connecting piece, and the connecting piece is connected to the retractable core, and the retractable core is provided with a first through hole passing through the upper and lower sides of the retractable core, and the lower end of the upper return tube passes through the first through hole and the upper cylinder and extends into the lower cylinder; the cache device body also includes a conduit, and the mud pad is provided with a second through hole passing through the upper and lower sides of the mud pad, the upper end of the conduit passes through the second through hole and is fixedly connected to the mud pad, the upper end of the conduit can be connected and communicated with the lower end of the upper return tube, the drill rod passes through and extends out of the upper return tube and the conduit and is fixedly connected to the upper return tube, and the bottom end of the drill rod is equipped with a drill bit.

[0011] Preferably, the connecting member is a flange, the upper return pipe passes through the center hole of the flange and is connected to the flange by bolts, the flange forms a detachable connection with the retractable core by bolts, and a hanging point can be set on the retractable core.

[0012] Preferably, the catheter is fixedly connected to the mud pad through a catheter head, the catheter head is annular, the catheter is inserted into the catheter head and fixedly connected to the catheter head, the catheter head is fixedly connected to the mud pad through a fixing pin, the mud pad is provided with a screw hole extending in a horizontal direction, the outer side of the catheter head is provided with an annular groove extending circumferentially along the catheter head, the fixing pin has a threaded section and a smooth section, the threaded section is threadedly connected to the screw hole, and the smooth section is inserted into the annular groove.

[0013] Preferably, a slurry outlet is provided on the lower cylinder, and the slurry outlet is used to communicate with the slurry outlet pipe of the mud circulation system. A filter element is also fixedly provided in the lower cylinder, and the filter element is funnel-shaped. The upper end of the filter element is higher than the slurry outlet, and the lower end of the filter element is communicated with the second through hole.

[0014] The present invention also provides an operating method of a mud buffer system, comprising the following steps:

[0015] Lowering steps: On land, move the retractable core to the top of the cache device body so that the clamping joint is aligned with the position of the introduction slot. Then, control the drill rod to move downward and extend it into the cache device body so that the clamping joint slides to the lower end of the introduction slot. Then, reverse the drill rod so that the clamping joint slides along a slide slot to the end of the slide slot away from the introduction slot. Then, lift the drill rod and the cache device body. Finally, move the drill rod and lower the cache device body to the designated position on the bottom of the water.

[0016] Operation steps: Under water, rotate the drill pipe forward to slide the clamping joint along the slide groove to the position where the guide groove is located, then lift the drill pipe to retract the retractable core to the deck, and lower the drilling device to perform the operation;

[0017] Recovery steps: first recover the drilling device, and lower the retractable core to insert the drill rod into the cache device body, and slide the clamping joint from the upper end of the introduction groove to the lower end of the introduction groove underwater, then forward the drill rod to slide the clamping joint along another slide groove to another end of the slide groove away from the introduction groove, then lift the drill rod and lift the cache device body until the cache device body is out of water.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention provides a retractable device with a retractable member fixedly connected to the main body of the buffer device. Before lowering, a clamping joint is inserted into a chute along the guide slot. The drill rod is rotated to slide the clamping joint to the end of the chute away from the guide slot. The drill rod is then lifted and moved, and the main body of the buffer device is lowered to a designated underwater position. During operation, the drill rod is rotated forward underwater, the clamping joint slides to the lower end of the guide slot, the drill rod is lifted, the retractable core is retrieved, and the drilling rig is lowered to operate. To retrieve the main body of the buffer device, the drilling rig is retracted, the retractable core is lowered, the clamping joint slides into the chute along the guide slot, and the drill rod is rotated forward to slide the clamping joint to the other end of the chute away from the guide slot. The drill rod is then lifted to retrieve the buffer device from the water. Retrieving and lowering the main body of the buffer device only requires one set of retractable tools, which, in conjunction with the drill rod commonly used during drilling, allows for lowering, rotation, and retrieval. This is much simpler than using two separate sets of tools for retrieval and lowering. Furthermore, the drill rod does not need to be rotated underwater, eliminating the risk of the drill rod disengaging underwater and providing enhanced safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A three-dimensional structural diagram of the retractable component in the retractable device provided by the present invention;

[0022] Figure 2 A front view of the retractable core provided by the present invention;

[0023] Figure 3 A top view of the retractable core and the retractable member in the retractable core provided by the present invention;

[0024] Figure 4 A front view of the mud buffer system provided by the present invention;

[0025] Figure 5 A diagram showing the internal structure of the mud buffer system provided by the present invention;

[0026] Figure 6 for Figure 5 A partial enlarged view of point A in the middle;

[0027] In the figure: 1. retractable part; 11. inlet groove; 12. slide groove; 13. snap-in groove; 14. first positioning part; 2. retractable core; 21. drill rod; 22. retractable core; 221. snap joint; 222. drag reduction hole; 23. upper return pipe; 24. second positioning part; 25. connector; 26. drill bit; 3. limit pin; 4. cache device body; 41. upper cylinder; 411. oil cylinder; 412. working platform; 42. lower cylinder; 421. slurry outlet; 43. mud pad; 44. conduit; 45. conduit head; 46. fixing pin; 461. smooth section; 462. threaded section; 47. filter element. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The purpose of the present invention is to provide a retractable device, a mud buffer system and an operating method thereof, so as to solve the problems existing in the above-mentioned prior art, facilitate lowering and recovery, and be safer.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] This embodiment provides a retractable device, such as Figure 1-4 As shown, it includes: a retractable part 1 and a retractable tool 2, the retractable part 1 is used to be fixedly connected to the cache device body 4, and a plurality of clamping structures are provided on the retractable part 1, the clamping structure includes an inlet groove 11 and two clamping grooves, the inlet groove 11 is vertically arranged, the upper end of the inlet groove 11 is used to penetrate with the top of the cache device body 4, the two clamping grooves are respectively arranged on both sides of the inlet groove 11, the clamping groove includes a slide groove 12, the slide groove 12 is used to extend along the circumference of the cache device body 4, and one end of each of the two slide grooves 12 is penetrated with the lower end of the inlet groove 11, the retractable tool 2 includes a retractable core 22 and a drill rod 21, the retractable core 22 is fixedly connected with the drill rod 21 in the circumferential direction of the retractable core 22, and a plurality of clamping joints 221 that can correspond to the position of the clamping structure are provided on the retractable core 22, and the clamping joints 221 can form a clamping connection with the clamping structure.

[0033] The retractable device provided in this embodiment has a retractable component 1 that is fixedly connected to the main body 4 of the cache device. Before lowering, the clamping joint 221 enters the chute 12 along the inlet groove 11, and by reversing the drill rod, the clamping joint 221 slides to the end of the chute 12 away from the inlet groove 11, and then the drill rod is moved to lower the main body 4 of the cache device to a designated position underwater. During operation, the drill rod 21 is rotated forward underwater, the clamping joint 221 slides to the lower end of the inlet groove 11, the drill rod is lifted up, the retractable core 22 is recovered, and the drilling device is lowered to work. When retrieving the main body 4 of the cache device, the drilling device is retracted, the retractable core 22 is lowered, the clamping joint 221 slides into the chute 12 along the inlet groove 11, and by forwarding the drill rod, the clamping joint 221 slides to the other end of the chute 12 away from the inlet groove 11, and then the drill rod is lifted up to retrieve the cache device from the water. The recovery and lowering of the cache device body 4 only requires the use of a set of retractable tools 2, which can be used in conjunction with the drill rod 21 commonly used in the drilling process to achieve lowering, rotation and recovery. This is simpler than using two different sets of tools for recovery and lowering. Moreover, when underwater, the drill rod 21 does not need to be reversed, and the drill rod will not have the risk of underwater disengagement, which is safer. Among them, the forward drill rod is to rotate the drill rod in the direction of tightening the thread, and the reverse drill rod is to rotate the drill rod in the direction of loosening the thread. The drill rod 21 is connected to the retractable core 22 by bolts; the drill rod 21 can be used as the drill rod of the drilling device, or it can be used alone by the retractable core 22.

[0034] In a preferred embodiment of this embodiment, the engaging groove further comprises an insertion groove 13, which is vertically arranged. One end of each of the two insertion grooves 13 is connected to the end of each of the two engaging grooves away from the introduction groove 11, and the other end of each of the two insertion grooves 13 is closed. When the engaging joint 221 slides to the end of the slide groove 12 away from the introduction groove 11, the drill rod is lifted, and the engaging joint 221 can slide into the insertion groove 13. The engaging joint 221 cooperates with the insertion groove 13 to prevent the retractable core 22 from rotating in the circumferential direction of the retractable member 1, thereby improving the safety of the device.

[0035] It should be noted that when the snap-in groove 13 is not provided, the snap joint 221 can be directly placed against the inner wall of the slide groove 12; or a friction surface can be provided on the inner wall of the slide groove 12 to increase the friction between the top of the slide groove 12 and the snap joint 221 to prevent the retractable core 22 from rotating in the circumferential direction of the retractable component 1.

[0036] In a preferred embodiment of this embodiment, a stopper pin 3 is further included. A plurality of first positioning portions 14 are fixedly connected to the outer side of the retractable member 1. Each first positioning portion 14 is provided with a first axial hole, each of which corresponds to the position of a snap-in slot 13. A second positioning portion 24 is fixedly connected to the side of the retractable core 22. The second positioning portion 24 is provided with a second axial hole. The second axial hole can rotate with the rotation of the retractable core 22 so that the second axial hole aligns with the position of any first axial hole. The stopper pin 3 can be simultaneously inserted into one of the corresponding second axial holes and one of the corresponding first axial holes. By inserting the stopper pin 3 into one of the first axial holes and one of the corresponding second axial holes, the retractable core 22 can be further prevented from rotating circumferentially in the retractable member 1. Underwater, the stopper pin 3 is inserted and removed using an underwater robot. Furthermore, while underwater, the underwater robot can observe the positions of the first and second axial holes to determine whether the retractable core 22 is aligned with the introduction slot 11 or has rotated to the position of the snap-in slot 13. Among them, the robot is preferably an ROV underwater robot.

[0037] Example 2

[0038] This embodiment provides a mud cache system, such as Figure 3-6 As shown, it includes a cache device body 4 and the retractable device in embodiment 1, the retractable component 1 is fixedly connected to the cache device body 4, and the retractable core 22 is used to recover the cache device body 4 from water and lower it into water.

[0039] The mud buffer system provided in this embodiment utilizes the retraction and deployment device of the first embodiment for retraction and deployment. Retrieving and lowering the buffer device body 4 requires only one set of retraction and deployment tools 2, which is used in conjunction with the drill pipe 21 commonly used during drilling. This simplifies the process compared to using two separate sets of retraction and deployment tools 2 for retrieval and lowering. Furthermore, the drill pipe 21 does not need to be rotated underwater, eliminating the risk of underwater disengagement, thus enhancing safety.

[0040] In a preferred embodiment of this embodiment, the buffer device body 4 includes an upper cylinder 41, a lower cylinder 42, and a mud pad 43. The retractable member 1 is annular. The upper end of the upper cylinder 41 is fixedly connected to the lower end of the retractable member 1. The lower end of the upper cylinder 41 is detachably connected to the upper end of the lower cylinder 42. The lower end of the lower cylinder 42 is fixedly connected to the mud pad 43. The lower side of the mud pad 43 is used to contact the bottom of the water. The inner side surfaces of the retractable member 1, the upper cylinder 41, and the lower cylinder 42 are all cylindrical surfaces. The various clamping structures are sequentially arranged on the inner side of the retractable member 1 along the circumference of the upper cylinder 41. The inner side surfaces of the upper cylinder 41 and the lower cylinder 42 are both smooth cylindrical surfaces, and can be cylindrical surfaces. Compared with a non-smooth interior with sharp corners, this can reduce the risk of rock debris deposition. The upper cylinder 41 and the lower cylinder 42 are detachably connected. During transportation, the upper cylinder 41 and the lower cylinder 42 can be placed and transported separately, avoiding the inconvenience of transportation caused by the excessive height of the combined upper cylinder 41 and the lower cylinder 42; moreover, the upper cylinder 41 is also provided with a working platform 412 for assisting the operation of the underwater robot. The working platform 412 is expensive. During the operation, the lower cylinder 42 may not be able to be recovered due to various reasons. At this time, the upper cylinder 41 can be disassembled, and only the working platform 412 can be recovered together with the upper cylinder 41, reducing property losses.

[0041] The lower end of the upper cylinder 41 is fixedly connected to a first docking male and female head, and the upper end of the lower cylinder 42 is fixedly connected to a second docking male and female head. The first docking male and female head is larger than the second docking male and female head. The first docking male and female head is provided with a plurality of first plug holes, and the second docking male and female head is provided with a plurality of second plug holes corresponding to the positions of the first plug holes. An oil cylinder 411 is fixedly installed outside the first docking male and female head. A pin is fixedly connected to the piston rod of the oil cylinder 411. The pin can be inserted or pulled out of the first and second plug holes corresponding to the positions under the drive of the oil cylinder 411 to achieve a detachable connection between the upper cylinder 41 and the lower cylinder 42. The pin, the retractable member 1, the upper cylinder 41, and the lower cylinder 42 are all made of 45 steel, which increases the strength of the cache device body 4, reduces deformation caused by accidental causes such as bumps, and enables the cache device body 4 to be reused.

[0042] In a preferred embodiment of this embodiment, the outer side surface of the retractable core 22 is a cylindrical surface, and each clamping joint 221 is fixedly connected to the outer side surface of the retractable core 22 in sequence along the circumference of the retractable core 22; the retractable tool also includes an upper return tube 23 and a connecting piece 25, the upper return tube 23 is connected to the connecting piece 25, and the connecting piece 25 is connected to the retractable core 22, and the retractable core 22 is provided with a first through hole that passes through the upper and lower sides of the retractable core 22, and the lower end of the upper return tube 23 can The buffer device body 4 also includes a guide tube 44. The mud pad 43 is provided with a second through-hole extending through the upper and lower sides of the mud pad 43. The upper end of the guide tube 44 passes through the second through-hole and is fixedly connected to the mud pad 43. The upper end of the guide tube 44 can connect and communicate with the lower end of the upper return pipe 23. The drill rod 21 passes through and extends from the upper return pipe 23 and the guide tube 44 and is connected to the connector 25. The bottom end of the drill rod 21 is mounted with a drill bit 26. During the lowering of the buffer device body 4, the retractable core 22 cooperates with the drill rod 21 and the drill bit 26 to complete part of the drilling work. The drill bit 26 at the lower end of the drill rod 21 is driven by a screw motor and can rotate independently. Before the mud pad 43 contacts the water bottom, the drill bit first contacts the water bottom. As the drill bit rotates, it opens a wellhead at a designated location on the water bottom. The guide tube 44 can extend into the wellhead and protect the well wall, preventing the wellhead from collapsing. The retractable core 22 is provided with a resistance reducing hole 222 penetrating the upper and lower sides of the retractable core 22 . The resistance reducing hole 222 can allow water to pass through during the lowering process, so as to reduce the resistance of the water flow during the lowering process of the retractable core 22 .

[0043] In a preferred embodiment of this embodiment, the connecting member 25 is a flange, the upper return pipe 23 passes through the center hole of the flange and is connected to the flange by bolts, the drill rod 21 is connected to the flange by bolts, and the flange is detachably connected to the retractable core 22 by bolts, and a hanging point can be set on the retractable core 22. The retractable core 21 has two functions. In addition to being a component of the retractable tool 2 as mentioned above to achieve the retraction and extension of the cache system body 4, a hanging point can also be set on the retractable core 22, and the bolts can be removed to separate the retractable core 22 from the flange, drill rod and upper return pipe, and the retractable core 22 can be separately clamped on the retractable member 1, and the retractable core 22 can be used as a lifting tool.

[0044] In a preferred embodiment of this embodiment, the catheter 44 is fixedly connected to the mud pad 43 through the catheter head 45. The catheter head 45 is annular. The catheter 44 is inserted into the catheter head 45 and fixedly connected to the catheter head 45. The catheter head 45 is fixedly connected to the mud pad 43 through a fixing pin 46. The mud pad 43 is provided with a screw hole extending in the horizontal direction. The outer side of the catheter head 45 is provided with an annular groove extending circumferentially along the catheter head 45. The fixing pin 46 has a threaded section 462 and a smooth section 461. The threaded section 462 is threadedly connected to the screw hole, and the smooth section 461 is inserted into the annular groove. When the catheter 44 enters the wellhead, the catheter 44 will tend to move upward in the vertical direction due to the resistance between it and the well wall, thereby causing the fixing pin 46 to be subjected to a large external force. Compared with the method of providing a smooth section 461 on the fixing pin 46 and the method of providing threads on the fixing pin 46 and threadedly connecting the fixing pin 46 to the catheter head 45, the method can prevent the threads at the connection between the catheter head 45 and the fixing pin 46 from being damaged due to excessive force, thereby avoiding difficulty in disassembly.

[0045] In a preferred embodiment of this embodiment, a slurry outlet 421 is provided on the lower cylinder 42. The slurry outlet 421 is used to communicate with the slurry outlet pipe of the mud circulation system. A filter element 47 is also fixedly installed in the lower cylinder 42. The filter element 47 is funnel-shaped, with the upper end of the filter element 47 higher than the slurry outlet 421, and the lower end of the filter element 47 is connected to the second through hole. During the drilling process, mud flows back up and enters the buffer device body 4 from the drilling device. The slurry outlet of the drilling device is higher than the upper end of the filter element 47. The mud first passes through the filter element 47 to filter out large particles of rock debris, and then is discharged through the slurry outlet 421, allowing the slurry to enter the mud circulation system.

[0046] Example 3

[0047] A method for operating a mud buffer system comprises the following steps:

[0048] Lowering steps: On land, move the retractable core 22 to the top of the buffer device body 4 so that the clamping joint 221 is aligned with the position of the introduction slot 11. Then, control the drill rod 21 to move downward and extend it into the buffer device body 4, so that the clamping joint 221 slides to the lower end of the introduction slot 11. Then, reverse the drill rod 21 and slide the clamping joint 221 along one of the slide slots 12 to the end of the slide slot 12 away from the introduction slot 11. Then, lift the drill rod 21 and the buffer device body 4. Finally, move the drill rod 21 and lower the buffer device body 4 to the designated position on the bottom of the water.

[0049] Operation steps: Underwater, rotate the drill pipe 21 forward to slide the clamping joint 221 along the slide groove 12 to the position of the guide groove 11. Then, lift the drill pipe 21 to retract the retractable core 22 to the deck, and lower the drilling rig to operate;

[0050] Recovery steps: First recover the drilling device and lower the retractable core 22, so that the card joint 221 slides from the upper end of the introduction groove 11 to the lower end of the introduction groove 11 underwater, then forward the drill rod 21, so that the card joint 221 slides along another slide groove 12 to the end of the other slide groove 12 away from the introduction groove 11, then lift the drill rod 21 and lift the cache device body 4 until the cache device body 4 is out of the water.

[0051] The mud buffer system operating method provided in this embodiment utilizes only one set of retraction and deployment tools 2 for retrieving and lowering the buffer device body 4, in conjunction with the drill pipe 21 commonly used during drilling. This simplifies the operation compared to using two separate sets of tools for retrieval and lowering. Furthermore, the drill pipe 21 does not need to be rotated underwater, eliminating the risk of the drill pipe becoming disengaged underwater and providing enhanced safety.

[0052] Specifically, in the lowering step, the operation step and the recovery step, when the drill rod 21 is lifted, the clamping joint 221 can slide into the clamping groove 13 to limit the rotation of the retractable core 22 in the circumferential direction of the retractable component 1; when performing the operation step, the limit pin 3 can be inserted mechanically or manually, and when performing the operation step and the recovery step underwater, the limit pin 3 can be plugged and unplugged by an underwater robot.

[0053] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for operating a mud buffer system, characterized by:

4. The repairing kit for automotive dents, according to claim 1, wherein a bottom of the foot stand comprises a through-hole, and the two foot pieces comprise two bosses, wherein the bosses comprise a through-hole, a screw bolt, and a nut. The through-hole comprises a screw bolt, and the nut is attached to the foot stand. The bosses comprise a through-hole, a screw bolt, and a nut. The operation method includes the following steps: Lowering steps: On land, move the retractable core to the top of the cache device body so that the clamping joint is aligned with the position of the introduction slot. Then, control the drill rod to move downward and extend it into the cache device body so that the clamping joint slides to the lower end of the introduction slot. Then, reverse the drill rod so that the clamping joint slides along a slide slot to the end of the slide slot away from the introduction slot. Then, lift the drill rod and the cache device body. Finally, move the drill rod and lower the cache device body to the designated position on the bottom of the water. Operation steps: Under water, rotate the drill pipe forward to slide the clamping joint along the slide groove to the position where the guide groove is located, then lift the drill pipe to retract the retractable core to the deck, and lower the drilling device to perform the operation; Recovery steps: first recover the drilling device, and lower the retractable core to insert the drill rod into the cache device body, and slide the clamping joint from the upper end of the introduction groove to the lower end of the introduction groove underwater, then forward the drill rod to slide the clamping joint along another slide groove to another end of the slide groove away from the introduction groove, then lift the drill rod and lift the cache device body until the cache device body is out of water.

2. The method for operating the mud buffer system according to claim 1, characterized in that: The clamping slot also includes a clamping slot, which is vertically arranged. One end of each of the two clamping slots is connected to the end of each of the two clamping slots away from the introduction slot, and the other end of each of the two clamping slots is closed.

3. The method for operating the mud buffer system according to claim 2, characterized in that: The retractable device also includes a limiting latch, a plurality of first positioning parts are fixedly connected to the outer side of the retractable member, each of the positioning parts is provided with a first axial hole, each of the first axial holes corresponds to the position of one of the snap-in slots, a second positioning part is fixedly connected to the side surface of the retractable core, a second axial hole is provided on the second positioning part, the second axial hole can rotate with the rotation of the retractable core so that the second axial hole corresponds to the position of any one of the first axial holes, and the limiting latch can be inserted into a second axial hole and a first axial hole of corresponding positions at the same time.

4. A mud buffer system, characterized by: The invention comprises a retractable device and a cache device body in the operation method of the mud cache system according to any one of claims 1 to 3, wherein the retractable component is fixedly connected to the cache device body, and the retractable core is used to recover the cache device body from the water and lower it into the water.

5. The mud buffer system according to claim 4, characterized in that: The main body of the cache device includes an upper cylinder, a lower cylinder and a mud pad. The retractable part is annular. The upper end of the upper cylinder is used to be fixedly connected to the lower end of the retractable part. The lower end of the upper cylinder is detachably connected to the upper end of the lower cylinder. The lower end of the lower cylinder is fixedly connected to the mud pad. The lower side of the mud pad is used to contact the bottom of the water. The inner side surfaces of the retractable part, the upper cylinder and the lower cylinder are all cylindrical. Each of the clamping structures is arranged on the inner side of the retractable part in sequence along the circumference of the retractable part.

6. The mud buffer system according to claim 5, characterized in that: The outer side surface of the retractable core is a cylinder, and each of the clamping joints is fixedly connected to the outer side surface of the retractable core in sequence along the circumference of the retractable core; the retractable tool also includes an upper return tube and a connecting piece, the upper return tube is connected to the connecting piece, and the connecting piece is connected to the retractable core, and the retractable core is provided with a first through hole passing through the upper and lower sides of the retractable core, and the lower end of the upper return tube passes through the first through hole and the upper cylinder and extends into the lower cylinder; the cache device body also includes a conduit, and the mud pad is provided with a second through hole passing through the upper and lower sides of the mud pad, the upper end of the conduit passes through the second through hole and is fixedly connected to the mud pad, the upper end of the conduit can be connected and communicated with the lower end of the upper return tube, the drill rod passes through and extends out of the upper return tube and the conduit and is fixedly connected to the upper return tube, and a drill bit is installed at the bottom end of the drill rod.

7. The mud buffer system according to claim 6, characterized in that: The connecting piece is a flange, the upper return pipe passes through the center hole of the flange and is connected to the flange by bolts, the flange is detachably connected to the retractable core by bolts, and a hanging point can be set on the retractable core.

8. The mud buffer system according to claim 6, characterized in that: The catheter is fixedly connected to the mud pad through a catheter head, and the catheter head is annular. The catheter is inserted into the catheter head and fixedly connected to the catheter head. The catheter head is fixedly connected to the mud pad through a fixing pin. A screw hole extending in a horizontal direction is provided on the mud pad, and an annular groove extending circumferentially along the catheter head is provided on the outer side of the catheter head. The fixing pin has a threaded section and a smooth section. The threaded section is threadedly connected to the screw hole, and the smooth section is inserted into the annular groove.

9. The mud buffer system according to claim 6, characterized in that: The lower cylinder is provided with a slurry outlet, which is used to communicate with the slurry outlet pipe of the mud circulation system. A filter element is also fixedly arranged in the lower cylinder. The filter element is funnel-shaped, and the upper end of the filter element is higher than the slurry outlet. The lower end of the filter element is communicated with the second through hole.

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