A quick connecting device for drill pipe used in ocean drilling

Abstract

This invention belongs to the technical field of marine drilling equipment, and particularly relates to a quick docking device for marine drilling drill pipes. It includes a hollow tubular drill pipe body with male and female connectors at both ends, and further includes a swivel-locking mechanism and an anti-rotation locking mechanism. The swivel-locking mechanism includes a connecting groove on the female connector's docking end face and a corresponding connecting block on the male connector. The connecting groove is divided into an entry section and a limiting section circumferentially. The entry section is a rectangular groove of equal width, and the limiting section is an inverted T-shaped groove. The connecting block has an inverted T-shaped cross-section. After insertion into the entry section, the connecting block rotates and slides into the limiting section to achieve axial limiting. The anti-rotation locking mechanism includes an annular limiting groove on the outer wall of the female connector, a split limiting ring, a limiting stop, and a disc spring assembly. Under the action of the disc spring assembly, the limiting stop extends into the entry section to prevent the connecting block from rotating in the opposite direction. This invention enables quick insertion and disassembly of drill pipes, has an anti-rotation locking function, provides reliable connection, and is suitable for marine drilling operations.

Description

Technical Field

[0001] This invention belongs to the field of marine drilling equipment technology, and particularly relates to a quick docking device for drill pipes used in marine drilling. Background Technology

[0002] In offshore oil and gas drilling, seabed mineral exploration, and deep-sea scientific drilling operations, drill pipes are the core components for drilling and core sampling. As drilling depth increases, frequent drill pipe extensions, connections, and disassemblies are required during drilling operations. The reliability, operational efficiency, and adaptability to complex marine conditions of the drill pipe connection structure directly affect the safety and economy of drilling operations. Currently, drill pipe connections in the marine drilling field mainly use threaded connections. One end of the drill pipe has a male thread, and the other end has a female thread; adjacent drill pipes are connected by thread engagement. Threaded connections have significant shortcomings in marine drilling conditions: thread engagement is cumbersome and inefficient, consuming a significant amount of time during frequent connection and disassembly; threaded connections are prone to "locking" due to overload or corrosion, making disassembly extremely difficult; the direction of thread rotation limits the drill pipe to unidirectional rotation, preventing bidirectional operation; and the high pressure, strong corrosion, and continuous vibration of the marine environment easily lead to thread loosening, wear, and corrosion failure. Summary of the Invention

[0003] The purpose of this invention is to provide a quick docking device for drill pipes used in marine drilling, so as to solve the technical problems of low efficiency, easy locking, and unidirectional rotation in existing marine drilling drill pipe connection methods.

[0004] To achieve the above objectives, the specific technical solution of the quick docking device for marine drilling pipes of the present invention is as follows: A quick docking device for marine drilling drill pipes, wherein one end of the drill pipe body is a male connector and the other end is a female connector, and two adjacent drill pipe bodies are docked through the male connector and the female connector, and the device also includes a swivel docking mechanism and an anti-rotation locking mechanism. The rotary locking mechanism includes at least two connecting grooves evenly distributed circumferentially on the mating end face of the female connector, and the same number of connecting blocks correspondingly disposed on the mating end face of the male connector; the connecting grooves extend inward along the axial direction of the drill rod body and are arc-shaped grooves with the drill rod body axis as the center; the connecting grooves are divided into an entry section and a limiting section circumferentially, with equal circumferential lengths in both sections, each accounting for half of the total circumferential length of the connecting groove; the radial cross-section of the connecting grooves is a rectangular groove of equal width in the entry section and an inverted T-shaped groove with a bottom width greater than the opening width in the limiting section; The connecting block extends outward along the axial direction of the drill pipe body and is an arc-shaped block corresponding to the position of the connecting groove; the radial cross section of the connecting block is an inverted T-shape, and its radial dimension is adapted to the width of the rectangular groove of the entry section of the connecting groove, and its circumferential length is adapted to the circumferential length of the entry section, so that it can be inserted into the connecting groove from the entry section along the axial direction. The anti-rotation locking mechanism includes an annular limiting groove, a split limiting ring, a limiting block with the same number of connecting grooves, and a disc spring assembly. The annular limiting groove is formed on the outer wall of the female connector, and its axial position corresponds to the bottom position of the connecting groove. The split limiting ring consists of two semi-arc ring bodies spliced ​​and fixed by connecting bolts, and is clamped in the annular limiting groove. Loosening the connecting bolts can expand the inner diameter of the split limiting ring so that it can be disassembled and removed from the annular limiting groove. The limiting block is radially slidably installed on the split limiting ring at the position of the corresponding entry section of the connecting groove, and its inner end can extend into the entry section of the connecting groove; a disc spring assembly is provided between each limiting block and the split limiting ring, and the disc spring assembly applies a radially inward pre-tightening thrust to the limiting block; a guide chamfer is provided on the upper part of the inner end of the limiting block.

[0005] Furthermore, the male connector has a guide head at its mating end, which is a frustum-shaped structure with an outer diameter that gradually decreases along the insertion direction; the female connector has a guide cavity at the front end of its inner hole, which is an inner conical surface structure that matches the taper of the guide head.

[0006] Furthermore, it also includes a circumferential positioning and guiding component, which includes a plurality of guide blocks evenly distributed circumferentially on the inner wall of the guide cavity, and a guide groove correspondingly formed on the outer wall of the guide head; The guide block has a wedge-shaped axial cross section, with the width of the end facing the insertion direction being smaller than the width of the other end; the width of the guide groove is adapted to the width of the wider end of the guide block, and the guide groove opening is provided with inlet chamfers on both sides; when the guide block is inserted into the guide groove along the axial direction to the bottom of the groove, the connecting block on the male connector and the entry section of the connecting groove on the female connector are circumferentially opposite each other.

[0007] Furthermore, a clearance groove is provided on one side of the bottom of the guide groove along the circumferential direction, and the axial depth of the clearance groove is the same as the axial height of the guide block.

[0008] Furthermore, the split-type limiting ring has a radial mounting groove corresponding to the position of each limiting block. The limiting block is slidably assembled in the radial mounting groove, and the disc spring assembly is disposed between the radial mounting groove and the outer end face of the limiting block.

[0009] Furthermore, the inverted T-shaped groove of the limiting section has a bottom wide groove section and a top narrow opening section. The bottom wall of the bottom wide groove section is used to support the bottom surface of the wide body of the connecting block in the axial direction, and the top narrow opening section is used to constrain the narrow body of the connecting block in the radial direction.

[0010] The drill pipe docking method using a rapid docking device for marine drilling includes the following steps: S1. Place the male connector of the upper drill pipe body and the female connector of the lower drill pipe body axially opposite each other, so that the guide head of the male connector is axially opposite to the guide cavity of the female connector. S2. Insert the male connector into the female connector along the axial direction. The outer conical surface of the guide head fits and engages with the inner conical surface of the guide cavity, guiding the two drill rod bodies to automatically align coaxially. At the same time, each guide block enters the corresponding guide groove and slides along the guide groove, guiding each connecting block and the entry section of each connecting groove to be circumferentially opposite. S3. Continue to advance the male connector axially, so that each connecting block is axially inserted into the connecting groove through its corresponding entry section; during the insertion process, the lower end face of the connecting block abuts against the guide chamfer on the upper part of the inner end of the limiting block, pushing the limiting block to slide radially outward and compressing the disc spring assembly, so that the limiting block exits the connecting groove to make way for the connecting block; when the connecting block is fully inserted to the bottom of the connecting groove, the limiting block is completely pushed away from the connecting groove; S4. Rotate the male connector circumferentially, causing multiple connecting blocks to slide from the entry section into the corresponding limiting section along the connecting groove. The wide part of the connecting block enters the bottom wide groove section of the limiting section, and the narrow part of the connecting block enters the top narrow opening section of the limiting section. The bottom wall of the groove in the limiting section supports the bottom surface of the wide part of the connecting block axially, thereby achieving axial limiting of the two drill pipe bodies. At the same time, the guide block rotates synchronously with the male connector and slides into the clearance groove. The bottom surface of the clearance groove supports the bottom surface of the guide block and shares the axial load with the bottom wall of the groove in the limiting section. S5. After the connecting block rotates and slides into the limiting section, the limiting block is radially reset and extends into the entry section of the connecting groove under the pre-tightening thrust of the disc spring group. The limiting block prevents the connecting block from rotating back from the limiting section to the entry section in the circumferential direction, thus completing the rapid docking and bidirectional circumferential limiting and locking of the two drill pipe bodies.

[0011] Furthermore, it also includes a separation step for the two drill pipe bodies: S6. Loosen the connecting bolts and remove the split-type limiting ring from the annular limiting groove. The limiting block will leave the entry section of the connecting groove together with the split-type limiting ring, thus releasing the circumferential obstruction to the reverse rotation of the connecting block. S7. Reverse circumferential rotation of the male connector, causing each connecting block to retract from the limit section to the entry section; S8. Pull out the male connector along the axial direction, so that multiple connecting blocks exit the connecting groove through the corresponding entry section, and complete the disassembly and separation of the two drill pipe bodies.

[0012] The quick docking device for marine drilling pipes of the present invention has the following advantages: The rotary locking mechanism uses only two actions—axial insertion and circumferential rotation—to lock and connect two drill pipes, eliminating the need for complex thread tightening. After the connecting block is axially inserted into the connecting groove from the entry section, it only needs to be rotated a certain angle to slide into the limiting section to achieve axial positioning. Compared to traditional threaded connections that require multiple rotations, this invention features smaller insertion and rotation angles, shortening connection and disassembly time. It is suitable for offshore drilling operations with frequent drill pipe connections and disassemblies, thus improving drilling efficiency.

[0013] The anti-rotation locking mechanism, through the cooperation of a limit stop and a disc spring assembly, ensures reliable anti-loosening locking after the connecting block rotates and slides into the limit section. The limit stop, under the preload thrust of the disc spring assembly, automatically extends into the entry section of the connecting groove, preventing the connecting block from rotating back into the entry section circumferentially. This locking action is maintained by the continuous preload force provided by the disc spring assembly, eliminating the need for manual tightening. Furthermore, the disc spring assembly features linear load and deformation characteristics, low hysteresis, and high load-bearing capacity, maintaining good elastic recovery performance even under continuous vibration conditions in marine drilling. This ensures the limit stop remains in the locked position, effectively preventing the risk of loosening due to vibration.

[0014] By fitting the guide head with the conical surface of the guide cavity, the two drill pipe bodies can be automatically aligned coaxially during the docking process, eliminating alignment deviations caused by ocean wave undulations. The circumferential positioning guide assembly, through the wedge-shaped engagement of the guide block and the guide groove, enables the connecting block and the connecting groove entry section to automatically align circumferentially, achieving a "blind insertion" operation. This reduces the docking difficulty during underwater or nighttime operations, making it particularly suitable for underwater drill pipe connection and disconnection operations. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of region A in the middle; Figure 3 For the present invention Figure 1 Enlarged view of region B in the middle; Figure 4 This is a schematic diagram of the exploded structure of the present invention; Figure 5 This is a schematic diagram of the connection structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged diagram of region C in the middle; The markings in the diagram are as follows: 1. Drill pipe body; 2. Male connector; 3. Female connector; 4. Connecting groove; 5. Connecting block; 6. Annular limiting groove; 7. Split-type limiting ring; 8. Limiting stop; 9. Disc spring assembly; 10. Guide head; 11. Guide cavity; 12. Guide block; 13. Guide groove; 14. Clearance groove; 15. Radial mounting groove. Detailed Implementation

[0016] To better understand the purpose, structure, and function of this invention, the following detailed description of a quick docking device for marine drilling is provided in conjunction with the accompanying drawings.

[0017] like Figure 1-6 As shown, the present invention provides a quick docking device for marine drilling drill pipes. One end of the drill pipe body 1 is a male connector 2, and the other end is a female connector 3. Two adjacent drill pipe bodies 1 are docked through the male connector 2 and the female connector 3. The device is characterized by further including a rotary docking mechanism and an anti-rotation locking mechanism. The rotary docking mechanism includes at least two connecting grooves 4 evenly distributed circumferentially on the docking end face of the female connector 3, and the same number of connecting blocks 5 correspondingly disposed on the docking end face of the male connector 2; the connecting grooves 4 extend inward along the axial direction of the drill rod body 1 and are arc-shaped grooves with the axis of the drill rod body 1 as the center; the connecting grooves 4 are divided into an entry section and a limiting section circumferentially, and the two sections have equal circumferential lengths, each accounting for half of the total circumferential length of the connecting grooves 4; the radial cross section of the connecting grooves 4 is a rectangular groove of equal width in the entry section and an inverted T-shaped groove with a bottom width greater than the opening width in the limiting section; The connecting block 5 extends outward along the axial direction of the drill pipe body 1 and is an arc-shaped block corresponding to the position of the connecting groove 4. The radial cross section of the connecting block 5 is an inverted T-shape, and its radial dimension is adapted to the width of the rectangular groove of the entry section of the connecting groove 4, and its circumferential length is adapted to the circumferential length of the entry section. It can be inserted into the connecting groove 4 axially from the entry section. The anti-rotation locking mechanism includes an annular limiting groove 6, a split limiting ring 7, limiting blocks 8 in the same number as the connecting groove 4, and a disc spring assembly 9. The annular limiting groove 6 is formed on the outer wall of the female connector 3, and its axial position corresponds to the bottom position of the connecting groove 4. The split limiting ring 7 is made of two semi-arc ring bodies spliced ​​and fixed by connecting bolts, and is installed in the annular limiting groove 6. Loosening the connecting bolts can expand the inner diameter of the split limiting ring 7 so as to remove it from the annular limiting groove 6. The limiting block 8 is radially slidably installed on the split limiting ring 7 at the position corresponding to the entry section of the connecting groove 4, and its inner end can extend into the entry section of the connecting groove 4; a disc spring group 9 is provided between each limiting block 8 and the split limiting ring 7, and the disc spring group 9 applies a radially inward pre-tightening thrust to the limiting block 8; a guide chamfer is provided on the upper part of the inner end of the limiting block 8.

[0018] Combination Figure 1-6 As shown, this invention discloses a quick-connect device for marine drilling drill pipes, comprising a hollow tubular drill pipe body 1. One end of the drill pipe body 1 is a male connector 2, and the other end is a female connector 3. Adjacent drill pipe bodies 1 are connected via the male connector 2 and the female connector 3. The central through-hole of the drill pipe body 1 is used to transport drilling fluid. The internal channels of the male connector 2 and the female connector 3 are coaxially connected to the central through-hole of the drill pipe body 1, ensuring smooth flow of drilling fluid at the drill pipe connection.

[0019] The rotary locking mechanism includes at least two connecting grooves 4 evenly distributed circumferentially on the mating end face of the female connector 3, and the same number of connecting blocks 5 correspondingly disposed on the mating end face of the male connector 2. The connecting grooves 4 extend axially inward along the drill pipe body 1, forming an arc-shaped groove centered on the axis of the drill pipe body 1. The connecting grooves 4 are circumferentially divided into an entry section and a limiting section, both with equal circumferential lengths, each occupying half of the total circumferential length of the connecting grooves 4. The radial cross-section of the connecting grooves 4 is a rectangular groove of equal width in the entry section and an inverted T-shaped groove with a bottom width greater than the opening width in the limiting section.

[0020] The connecting block 5 extends outward along the axial direction of the drill pipe body 1 and is an arc-shaped block corresponding to the position of the connecting groove 4. The radial cross-section of the connecting block 5 is an inverted T-shape, and its radial dimension is adapted to the width of the rectangular groove of the entry section of the connecting groove 4, and its circumferential length is adapted to the circumferential length of the entry section. It can be inserted into the connecting groove 4 axially from the entry section.

[0021] When the two drill pipe bodies 1 are joined together, the connecting block 5 on the male connector 2 is axially inserted into the entry section of the connecting groove 4 on the female connector 3. After being inserted to the bottom of the groove, the male connector 2 is rotated circumferentially, and the connecting block 5 slides into the limiting section. The inverted T-shaped cross section of the connecting block 5 and the inverted T-shaped groove of the limiting section form an interlocking fit, realizing the axial limiting and unidirectional circumferential limiting of the two drill pipe bodies 1 (limiting the male connector 2 from rotating in the direction of continued tightening relative to the female connector 3, but not limiting the reverse rotation).

[0022] like Figure 4-6As shown, the anti-rotation locking mechanism includes an annular limiting groove 6, a split-type limiting ring 7, limiting blocks 8 (the same number as the connecting groove 4), and a disc spring assembly 9. The annular limiting groove 6 is formed on the outer wall of the female connector 3, and its axial position corresponds to the bottom position of the connecting groove 4. The annular limiting groove 6 is an annular groove surrounding the outer wall of the female connector 3, with groove walls on both axial sides, used to position the split-type limiting ring 7 axially.

[0023] The split-type retaining ring 7 consists of two semi-circular retaining ring bodies joined and fixed together by connecting bolts, and is fitted into the annular retaining groove 6. Loosening the connecting bolts expands the inner diameter of the split-type retaining ring 7, allowing it to be removed from the annular retaining groove 6. When the connecting bolts are in the locked state, the two semi-circular retaining ring bodies are tightly held within the annular retaining groove 6, and are axially fixed relative to the female connector 3.

[0024] The limiting block 8 is radially slidably installed on the split-type limiting ring 7 at the position corresponding to the entry section of the connecting groove 4, and its inner end can extend into the entry section of the connecting groove 4. A radial mounting groove 15 is provided on the split-type limiting ring 7 corresponding to the position of each limiting block 8, and the limiting block 8 is slidably assembled in the radial mounting groove 15. A disc spring assembly 9 is provided between each limiting block 8 and the split-type limiting ring 7, and the disc spring assembly 9 is located between the bottom of the radial mounting groove 15 and the outer end face of the limiting block 8. The disc spring assembly 9 always applies a radially inward preload to the limiting block 8, so that the limiting block 8 remains in the state of extending into the female connector 3 when no external force is applied.

[0025] The upper part of the inner end of the limiting block 8 is provided with a guide chamfer. The guide chamfer extends outward from the top of the inner end of the limiting block 8. During the axial insertion of the connecting block 5, the lower end face of the connecting block 5 first abuts against the guide chamfer. As the connecting block 5 continues to be inserted, the guide chamfer converts the axial movement of the connecting block 5 into a driving force that pushes the limiting block 8 to slide radially outward, thereby realizing the automatic repositioning of the limiting block 8 without additional operation.

[0026] During the docking process of the two drill pipe bodies 1, when the connecting block 5 is inserted from the entry section, its lower end face presses against the guide chamfer on the upper part of the inner end of the limiting block 8, pushing the limiting block 8 to slide radially outward and compressing the disc spring assembly 9, causing the limiting block 8 to exit the connecting groove 4 to make way for the connecting block 5. Subsequently, the male connector 2 is rotated to make the connecting block 5 slide into the limiting section. Under the pre-tightening thrust of the disc spring assembly 9, the limiting block 8 is radially reset inward and extends into the entry section of the connecting groove 4, preventing the connecting block 5 from rotating back from the limiting section to the entry section in the circumferential direction, thus achieving bidirectional circumferential limiting and axial locking of the two drill pipe bodies 1.

[0027] like Figure 2-6As shown, the male connector 2 has a guide head 10 at its mating end. The guide head 10 is a frustum-shaped structure with an outer diameter that gradually decreases along the insertion direction. The small end of the guide head 10 faces the female connector 3, and the large end is connected to the main body of the male connector 2. The female connector 3 has a guide cavity 11 at the front end of its inner hole. The guide cavity 11 is an inner conical surface structure that matches the taper of the guide head 10. The large end of the guide cavity 11 faces the male connector 2, and the small end is connected to the inner hole of the female connector 3.

[0028] When the two drill pipe bodies 1 are joined, the guide head 10 of the male connector 2 first enters the guide cavity 11 of the female connector 3, and the outer conical surface of the guide head 10 fits into the inner conical surface of the guide cavity 11. This conical fit has a self-aligning characteristic; when the two conical surfaces contact each other, under the action of the normal force of the conical surfaces, the guide head 10 is automatically guided to a position coaxial with the guide cavity 11, thereby achieving automatic coaxial alignment of the two drill pipe bodies 1. This conical fit also provides axial docking guidance, allowing the male connector 2 to be smoothly inserted into the female connector 3, avoiding jamming or collision damage caused by alignment deviations.

[0029] The circumferential positioning guide assembly includes multiple guide blocks 12 evenly distributed circumferentially on the inner wall of the guide cavity 11, and guide grooves 13 correspondingly formed on the outer wall of the guide head 10. The guide blocks 12 have a wedge-shaped structure in axial cross-section, with the width of the end facing the insertion direction being smaller than the width of the other end. That is, the guide blocks 12 gradually narrow from their root to their top, forming a wedge shape with a small front end and a large rear end. The width of the guide groove 13 is adapted to the width of the wider end of the guide block 12, and the guide groove 13 has inlet chamfers on both sides of the groove opening.

[0030] When the guide block 12 is inserted into the guide groove 13 axially, the narrower part of the front end of the guide block 12 first enters the groove opening of the guide groove 13. Under the guidance of the chamfer, even if there is a certain circumferential deviation between the guide block 12 and the guide groove 13, it can be gradually corrected during the insertion process. As the guide block 12 continues to slide axially to the bottom of the guide groove 13, the wider end of the guide block 12 fits tightly with the side wall of the guide groove 13. At this time, the connecting block 5 on the male connector 2 and the entry section of the connecting groove 4 on the female connector 3 are completely opposite in the circumferential position, ensuring the precise positioning of the two drill pipe bodies 1 in the circumferential direction. This allows the connecting block 5 and the entry section of the connecting groove 4 to be automatically aligned before docking, eliminating the need for manual alignment by the operator and realizing "blind insertion" rapid docking.

[0031] like Figure 3-6As shown, a clearance groove 14 extends circumferentially from the bottom of the guide groove 13, and the axial depth of the clearance groove 14 is the same as the axial height of the guide block 12. When the connecting block 5 rotates and slides into the limiting section along the connecting groove 4, the guide block 12 rotates and slides into the clearance groove 14 synchronously with the male connector 2. The bottom surface of the clearance groove 14 supports the bottom surface of the guide block 12, and together with the meshing of the connecting block 5 and the inverted T-shaped groove of the limiting section, it bears the axial load, forming a combined axial limiting structure. The axial load between the two drill pipe bodies 1 is borne by the rotary docking mechanism (the meshing of the connecting block 5 and the inverted T-shaped groove of the limiting section) and the circumferential positioning guide assembly (the meshing of the guide block 12 and the clearance groove 14), which increases the axial bearing area, improves the axial bearing capacity of the device, and avoids excessive local stress caused by the concentration of all axial load on the connecting block 5 and the limiting section.

[0032] like Figure 4-6 As shown, the inverted T-shaped groove of the limiting section has a wide bottom groove section and a narrow top opening section. The width of the wide bottom groove section is greater than the width of the narrow top opening section, and the two form an inverted T-shaped profile in the radial section.

[0033] The bottom wall of the wide groove section is used to support the bottom surface of the wide body of the connecting block 5 in the axial direction, and the top narrow section is used to constrain the narrow body of the connecting block 5 in the radial direction. When the connecting block 5 rotates and slides into the limiting section, the wide body of the connecting block 5 (i.e., the lower wider part of the inverted T-shaped cross section) enters the bottom wide groove section, and the narrow body of the connecting block 5 (i.e., the upper narrower part of the inverted T-shaped cross section) is located in the top narrow section.

[0034] When the two connected drill pipe bodies 1 are subjected to axial tensile force, the bottom surface of the wide part of the connecting block 5 forms a surface contact with the bottom wall of the bottom wide groove section. The axial tensile force is transmitted to the housing of the female connector 3 through this contact surface. The large force-bearing area and uniform stress distribution effectively avoid stress concentration. At the same time, the narrow opening at the top forms a radial constraint on the narrow part of the connecting block 5, so that the connecting block 5 will not have radial displacement when subjected to torque, ensuring smooth and reliable torque transmission.

[0035] Combination Figure 1-6 As shown, the method for docking drill pipes using the quick docking device for marine drilling of the present invention includes the following steps: S1. Docking preparation: Place the male connector 2 of the upper drill pipe body 1 and the female connector 3 of the lower drill pipe body 1 axially opposite each other, so that the guide head 10 of the male connector 2 and the guide cavity 11 of the female connector 3 are axially opposite each other.

[0036] S2. Insertion and Alignment: Insert the male connector 2 axially into the female connector 3. The outer conical surface of the guide head 10 fits against the inner conical surface of the guide cavity 11, and the conical surface guides the two drill pipe bodies 1 to automatically align coaxially. Subsequently, each guide block 12 enters the corresponding guide groove 13 and slides along the guide groove 13. The wedge-shaped structure of the guide block 12, which is narrow at the front and wide at the back, matches the chamfered inlet on both sides of the guide groove 13, automatically correcting circumferential deviation. When each guide block 12 is fully inserted into the guide groove 13, the entry sections of each connecting block 5 on the male connector 2 and each connecting groove 4 on the female connector 3 are completely aligned circumferentially.

[0037] S3. Insertion of Connecting Blocks: Continue to advance the male connector 2 axially, so that each connecting block 5 is axially inserted into the connecting groove 4 through its corresponding entry section. During insertion, the lower end face of the connecting block 5 first presses against the guide chamfer at the upper inner end of the limiting block 8. Due to the inclined surface of the guide chamfer, the axial insertion force of the connecting block 5 is converted into a driving force that pushes the limiting block 8 to slide radially outward. The limiting block 8 compresses the disc spring assembly 9 and slides outward along the radial mounting groove 15, exiting the connecting groove 4 to make room for the connecting block 5. When the connecting block 5 is fully inserted to the bottom of the connecting groove 4, the limiting block 8 is completely pushed away from the connecting groove 4.

[0038] S4. Rotary Locking: Using the drill rig's power head or a special rotary tool, rotate the male connector 2 circumferentially, causing each connecting block 5 to slide along the connecting groove 4 from the entry section into the limiting section. The wide part of the connecting block 5 enters the bottom wide groove section of the limiting section, and the narrow part of the connecting block 5 enters the top narrow opening section of the limiting section. The bottom wall of the limiting section groove supports the bottom surface of the wide part of the connecting block 5 axially, achieving axial limiting of the two drill pipe bodies 1. The guide block 12 rotates synchronously with the male connector 2 and slides into the clearance groove 14. The bottom surface of the clearance groove 14 supports the bottom surface of the guide block 12, and together with the bottom wall of the limiting section groove, they bear the axial load. The circumferential rotation angle of the male connector 2 is equal to the circumferential arc length of the entry section.

[0039] S5. Anti-rotation locking: After the connecting block 5 rotates and slides into the limiting section, the limiting stop 8 extends into the entry section of the connecting groove 4 under the pre-tightening thrust of the disc spring assembly 9. Since the limiting stop 8 is located in the entry section and the connecting block 5 is located in the limiting section, the limiting stop 8 is located on the rotation path of the connecting block 5 in the circumferential direction, preventing the connecting block 5 from rotating back from the limiting section to the entry section, thus completing the rapid docking and bidirectional circumferential limiting locking of the two drill pipe bodies 1.

[0040] When it is necessary to disassemble the two drill pipe bodies 1 that have been connected, the following steps shall be taken: S6. Release the circumferential obstruction: Loosen the connecting bolts on the split-type limiting ring 7. The inner diameter of the two semi-circular ring bodies expands, allowing the split-type limiting ring 7 to be removed from the annular limiting groove 6. The limiting block 8 disengages from the entry section of the connecting groove 4 along with the split-type limiting ring 7, releasing the circumferential obstruction to the reverse rotation of the connecting block 5. At this time, the connecting block 5 can freely retract from the limiting section to the entry section.

[0041] S7. Reverse Rotation Retraction: Rotate the male connector 2 in the reverse circumferential direction to retract each connecting block 5 from the limiting section to the entering section. Since the entering section is a rectangular groove of equal width, its width is adapted to the inverted T-shaped cross-section of the connecting block 5, allowing the connecting block 5 to move freely in and out along the axial direction.

[0042] S8. Axial pull-out separation: Pull out the male connector 2 axially, so that each connecting block 5 exits the connecting groove 4 through the corresponding entry section. The guide block 12 slides out synchronously along the guide groove 13, completing the disassembly and separation of the two drill pipe bodies 1.

[0043] The entire disassembly process requires no special tools, is simple and quick to operate, and the components are not damaged during disassembly and can be reused.

[0044] To adapt to the harsh working conditions of high pressure, high salt spray, and strong corrosion in marine drilling, the components of this invention are preferably made of corrosion-resistant, high-strength materials. The drill pipe body 1, male connector 2, and female connector 3 are preferably made of high-strength stainless steel or corrosion-resistant alloy steel to ensure sufficient structural strength and resistance to seawater corrosion. The mating surfaces of the limiting block 8, disc spring assembly 9, and connecting clip 5 with the connecting groove 4 are preferably surface-hardened, such as by nitriding or tungsten carbide spraying, to improve wear resistance and fatigue resistance. Conventional sealing components, such as O-rings, can be installed on the mating surfaces between the male connector 2 and the female connector 3 to prevent drilling fluid leakage from the connection.

[0045] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A quick-connection device for marine drilling drill pipes, comprising a hollow tubular drill pipe body (1), one end of the drill pipe body (1) being a male connector (2) and the other end being a female connector (3), wherein two adjacent drill pipe bodies (1) are connected via the male connector (2) and the female connector (3), characterized in that, It also includes a rotary docking mechanism and an anti-rotation locking mechanism; The rotary docking mechanism includes at least two connecting grooves (4) evenly distributed circumferentially on the docking end face of the female connector (3), and the same number of connecting blocks (5) correspondingly disposed on the docking end face of the male connector (2); the connecting grooves (4) extend inward along the axial direction of the drill rod body (1) and are arc-shaped grooves with the axis of the drill rod body (1) as the center; the connecting grooves (4) are divided into an entry section and a limiting section along the circumferential direction, and the circumferential lengths of the two sections are equal, each accounting for half of the total circumferential length of the connecting grooves (4); the radial cross section of the connecting grooves (4) is a rectangular groove of equal width in the entry section and an inverted T-shaped groove with a bottom width greater than the opening width in the limiting section; The connecting block (5) extends outward along the axial direction of the drill rod body (1) and is an arc-shaped block corresponding to the position of the connecting groove (4); the radial section of the connecting block (5) is an inverted T-shape, and its radial dimension is adapted to the width of the rectangular groove of the entry section of the connecting groove (4), and its circumferential length is adapted to the circumferential length of the entry section, so that it can be inserted into the connecting groove (4) along the axial direction from the entry section. The anti-rotation locking mechanism includes an annular limiting groove (6), a split limiting ring (7), limiting blocks (8) in the same number as the connecting groove (4), and a disc spring assembly (9); The annular limiting groove (6) is opened on the outer wall of the female connector (3), and its axial position corresponds to the bottom position of the connecting groove (4); the split limiting ring (7) is made of two semi-arc ring bodies spliced ​​and fixed by connecting bolts, and is installed in the annular limiting groove (6). Loosening the connecting bolts can expand the inner diameter of the split limiting ring (7) so as to remove it from the annular limiting groove (6); The limiting block (8) is radially slidably installed on the split limiting ring (7) at the position corresponding to the entry section of the connecting groove (4), and its inner end can extend into the entry section of the connecting groove (4); a disc spring assembly (9) is provided between each limiting block (8) and the split limiting ring (7), and the disc spring assembly (9) applies a radially inward pre-tightening thrust to the limiting block (8); a guide chamfer is provided on the upper part of the inner end of the limiting block (8).

2. The quick docking device for marine drilling pipes according to claim 1, characterized in that, The male connector (2) is provided with a guide head (10) at the mating end. The guide head (10) is a frustum structure with an outer diameter that gradually decreases along the insertion direction. The female connector (3) is provided with a guide cavity (11) at the front end of the inner hole. The guide cavity (11) is an inner conical surface structure that matches the taper of the guide head (10).

3. The quick docking device for marine drilling pipes according to claim 2, characterized in that, It also includes a circumferential positioning guide component, which includes a plurality of guide blocks (12) evenly distributed circumferentially on the inner wall of the guide cavity (11), and a guide groove (13) correspondingly opened on the outer wall of the guide head (10); The guide block (12) has a wedge-shaped structure in the axial section, and the width of the end facing the insertion direction is smaller than the width of the other end; the width of the guide groove (13) is adapted to the width of the wider end of the guide block (12), and the guide groove (13) has inlet chamfers on both sides of the groove opening; when the guide block (12) is inserted into the guide groove (13) along the axial direction to the bottom of the groove, the connecting block (5) on the male connector (2) and the entry section of the connecting groove (4) on the female connector (3) are opposite each other in the circumferential position.

4. The quick docking device for marine drilling pipes according to claim 3, characterized in that, The bottom of the guide groove (13) extends along one side in the circumferential direction and is provided with a relief groove (14), the axial depth of which is the same as the axial height of the guide block (12).

5. A quick docking device for marine drilling pipes according to claim 1, characterized in that, The split-type limiting ring (7) has a radial mounting groove (15) corresponding to the position of each limiting block (8). The limiting block (8) is slidably assembled in the radial mounting groove (15). The disc spring assembly (9) is set between the radial mounting groove (15) and the outer end face of the limiting block (8).

6. The quick docking device for marine drilling pipes according to claim 1, characterized in that, The inverted T-shaped groove of the limiting section has a bottom wide groove section and a top narrow opening section. The bottom wall of the bottom wide groove section is used to support the bottom surface of the wide body of the connecting block (5) in the axial direction, and the top narrow opening section is used to constrain the narrow body of the connecting block (5) in the radial direction.

7. A drill pipe docking method using the rapid docking device for marine drilling as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Place the male connector (2) of the upper drill pipe body (1) and the female connector (3) of the lower drill pipe body (1) opposite each other along the axial direction, so that the guide head (10) of the male connector (2) and the guide cavity (11) of the female connector (3) are axially opposite each other. S2. Insert the male connector (2) into the female connector (3) axially. The outer conical surface of the guide head (10) fits against the inner conical surface of the guide cavity (11), guiding the two drill rod bodies (1) to automatically align coaxially. At the same time, each guide block (12) enters the corresponding guide groove (13) and slides along the guide groove (13), guiding each connecting block (5) and the entry section of each connecting groove (4) to be circumferentially opposite. S3. Continue to advance the male connector (2) axially, so that each connecting block (5) is axially inserted into the connecting groove (4) through the corresponding entry section; during the insertion process, the lower end face of the connecting block (5) presses against the guide chamfer at the upper part of the inner end of the limiting block (8), pushes the limiting block (8) to slide radially outward and compresses the disc spring assembly (9), so that the limiting block (8) exits the connecting groove (4) to make way for the connecting block (5); when the connecting block (5) is fully inserted into the bottom of the connecting groove (4), the limiting block (8) is completely pushed away from the connecting groove (4); S4. Rotate the male connector (2) circumferentially so that multiple connecting blocks (5) slide from the entry section into the corresponding limiting section along the connecting groove (4). The wide part of the connecting block (5) enters the bottom wide groove section of the limiting section, and the narrow part of the connecting block (5) enters the top narrow opening section of the limiting section. The bottom wall of the groove of the limiting section supports the bottom surface of the wide part of the connecting block (5) in the axial direction, thereby achieving axial limiting of the two drill rod bodies (1). At the same time, the guide block (12) rotates synchronously with the male connector (2) and slides into the relief groove (14). The bottom surface of the relief groove (14) supports the bottom surface of the guide block (12) and together with the bottom wall of the groove of the limiting section, bears the axial load. S5. After the connecting block (5) rotates and slides into the limiting section, the limiting block (8) is radially reset and extends into the entry section of the connecting groove (4) under the pre-tightening thrust of the disc spring group (9). The limiting block (8) blocks the connecting block (5) from rotating back from the limiting section to the entry section in the circumferential direction, thus completing the rapid docking and bidirectional circumferential limiting and locking of the two drill rod bodies (1).

8. The docking method according to claim 7, characterized in that, It also includes the separation step of the two drill pipe bodies (1): S6. Loosen the connecting bolts and remove the split-type limiting ring (7) from the annular limiting groove (6). The limiting block (8) will leave the entry section of the connecting groove (4) together with the split-type limiting ring (7), thus releasing the circumferential obstruction to the reverse rotation of the connecting block (5). S7. Rotate the male connector (2) in the reverse circumferential direction to make each connecting block (5) retract from the limiting section to the entering section; S8. Pull out the male connector (2) along the axial direction, so that multiple connecting blocks (5) exit the connecting groove (4) through the corresponding entry section, and complete the disassembly and separation of the two drill rod bodies (1).

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