Drilling system for ground assembly of dual single-stand risers and method for running and pulling a drill pipe

Abstract

This invention discloses a drilling system with a ground-assembled double single-root standoff assembly, including a drilling platform. A power catwalk is provided on one side of the drilling platform, and a catwalk ramp is fixedly connected between the drilling platform and the power catwalk. A first row of pipe racks and a second row of pipe racks are respectively provided on both sides of the power catwalk. A ground-based iron drill is provided between the first row of pipe racks and the power catwalk. A fixing groove is opened along the longitudinal direction on the surface of the power catwalk, and a trolley is slidably connected in the fixing groove. Catwalk pipe racks are fixedly connected to both sides of the power catwalk. A wellhead is opened on the surface of the drilling platform, and a derrick is fixedly connected to one side of the wellhead on the surface of the drilling platform. A lifting mechanism is provided on the derrick. A drill-based iron drill is also provided on the surface of the drilling platform. The invention also relates to a method for drilling pipes using this drilling system. This invention allows for the assembly and disassembly of the standoffs on the ground, effectively reducing the load on the drilling platform, and is suitable for small drilling rigs and workover rigs.

Description

Technical Field

[0001] This invention belongs to the field of petroleum machinery and equipment technology, and relates to a drilling system with a ground-assembled double single-root drilling rig, as well as a method for drilling and tripping drill pipes using the system. Background Technology

[0002] With the increasing demand for energy, oil and gas exploration and development have become particularly important. In this field, drilling operations are a crucial link in acquiring underground resources. During the drilling process, efficient handling of the tubing string is a key factor in improving drilling efficiency and safety.

[0003] The current standard drilling rig tubing system is a three-single-segment drilling system, consisting of a tubing delivery system (hydraulic tubing rack, powered catwalk, buffer robot), a coupling system (iron drill bit, powered slips, powered chuck, powered rat hole), and a tubing system (second-level platform robot, drilling platform robot). Before drilling operations, the tubing delivery system delivers three drill pipes to the drilling platform. The stand-up system then connects the three drill pipes into a single drill pipe stand. Finally, the tubing system stores a sufficient number of drill pipe stands in the stand-up box on the drilling platform. During drilling operations, the stands stored in the stand-up box are connected using the coupling system to form a drill pipe string, which is then used to send the drill bit underground. During tripping, the drill pipe string in the well is disassembled into a single stand and stored in the stand-up box. After drilling is completed, the drill pipe stand is disassembled into individual drill pipes and transported to the surface. The entire operation, from the transport of individual supports, to the construction and dismantling of supports, and the arrangement and delivery of supports, involves many pieces of equipment, is complex, and is time-consuming and labor-intensive. This technical approach has a certain degree of adaptability for high-drilling platforms and heavy-load drilling rigs used in deep and ultra-deep wells. However, it is more complex for small drilling rigs and workover rigs, and the storage of supports on the drilling platform also requires a larger drilling platform space and load-bearing capacity. Summary of the Invention

[0004] The purpose of this invention is to provide a drilling system with dual single-root standers assembled on the ground, which solves the problem that existing drilling systems require stander assembly and disassembly on the drilling platform, involve many devices, and place a heavy load on the drilling platform, making them unsuitable for small drilling platforms.

[0005] The technical solution adopted in this invention includes a drilling platform, a powered catwalk on one side of the drilling platform, a catwalk ramp fixedly connected between the drilling platform and the powered catwalk, a first row of pipe racks and a second row of pipe racks respectively on both sides of the powered catwalk, a ground iron driller between the first row of pipe racks and the powered catwalk, a fixed groove opened along the length of the surface of the powered catwalk, a trolley slidably connected in the fixed groove, catwalk pipe racks fixedly connected on both sides of the powered catwalk, a wellhead opened on the surface of the drilling platform, a derrick fixedly connected on one side of the wellhead on the surface of the drilling platform, a lifting mechanism installed on the derrick, a buffer manipulator fixedly connected to the lower section of the derrick, a drilling platform iron driller also installed on the surface of the drilling platform, and a powered slip fixedly connected in the wellhead.

[0006] The invention is further characterized by: The ground-based iron drill includes two support frames located between the first row of pipe racks and the power catwalk. The two support frames are arranged along the length of the power catwalk, and a clamp assembly is provided between the two support frames. Hydraulic loading arms are provided on both sides of the two support frames, and transmission wheels along the length of the two support frames are provided on their surfaces.

[0007] The catwalk pipe rack has a first telescopic rod fixedly connected to each end.

[0008] Both the first and second pipe rack groups consist of several pipe racks arranged side by side, and the pipe racks are perpendicular to the power catwalk. Both ends of the pipe racks are equipped with second telescopic rods.

[0009] The hoisting mechanism includes a traveling crane assembly fixedly connected to the derrick, and a power hoist is fixedly connected to the lower part of the traveling crane assembly.

[0010] The drilling platform iron driller includes an iron driller body installed on the side of the drilling platform. A blowout preventer mud box is fixedly connected to the side of the iron driller body closest to the wellhead, and an oiling assembly is installed on one side of the iron driller body.

[0011] Another technical solution adopted in this invention is a drilling method using the above-mentioned system, specifically implemented according to the following steps: Step 1: Roll the two single pipes of the same group on the first row of pipe racks into the ground iron drill, and then start the ground iron drill to combine the two single pipes to form a vertical support; Step 2: Control the ground driller to move the stand to the adjacent catwalk pipe rack, and then activate the corresponding first telescopic rod to send the stand into the fixing groove; Step 3: Maintain the dynamic slips in the wellhead holding the tubing string in place; Step 4: Start the trolley on the power cat track, push the standpipe to the designated position, and then the hoisting mechanism and buffer manipulator work together to send the standpipe to the top of the well string. Start the drilling rig's iron driller to connect the standpipe and the well string, release the power slips, and the hoisting mechanism lowers the standpipe into the wellhead.

[0012] Another technical solution adopted in this invention is a drill pipe tripping method using the above-mentioned system, specifically implemented according to the following steps: Step 1: The lifting mechanism is raised until the stand is exposed on the drilling rig. The power slip is used to hold the tubing string in the well. Then, the driller on the drilling rig separates the stand from the tubing string. Step 2: The lifting mechanism and the buffer robot work in coordination to push the stand-up peg onto the catwalk ramp and slowly lower it into the powered catwalk, then disconnect the stand-up peg from the lifting mechanism. Step 3: When no further drilling operations are required, push the standpipe into the surface iron drill house, where the surface iron drill house will disassemble the standpipe into individual units. Finally, push the individual units into the first row of pipe racks. When further drilling operations are required, push the standpipe into the second row of pipe racks for storage.

[0013] The beneficial effects of this invention are: This invention allows the establishment and dismantling of the anchor during drilling to be carried out on the ground, eliminating the need for an anchor establishment system and anchor box on the drilling platform. This reduces the load on the drilling platform. Simultaneously, the installation and dismantling of the anchor on the ground does not conflict with wellhead operations. The anchor can be installed and dismantled while drilling or tripping the well, saving time on the drilling platform and improving efficiency and safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the drilling system of the present invention, which is assembled on the ground with two single-root uprights; Figure 2 This is a top view of the drilling system of the present invention, which is assembled on the ground with two single-root uprights; Figure 3 This is a side view of the drilling system for ground assembly of double single-root vertical shafts according to the present invention, which establishes the root; Figure 4 yes Figure 2 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the drilling operation of the ground-assembled double single-root drilling system of the present invention.

[0015] In the diagram: 1. Drilling platform; 2. Powered catwalk; 3. Catwalk ramp; 4. First row of pipe racks; 5. Second row of pipe racks; 6. Surface driller; 7. Fixing slot; 8. Cart; 9. Catwalk pipe rack; 10. Wellhead; 11. Derrick; 12. Lifting mechanism; 13. Drilling platform driller; 14. Support frame; 15. Clamp assembly; 16. Hydraulic loading arm; 17. Transfer wheel; 18. First telescopic rod; 19. Pipe rack; 20. Second telescopic rod; 21. Buffer manipulator; 22. Traveling hoist assembly; 23. Powered hoist; 24. Driller body; 25. Blowout preventer mud box; 26. Oiling assembly; 27. Powered slip. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] Example 1: like Figure 1 and Figure 2 As shown, the system includes a drilling platform 1, a powered catwalk 2 on one side of the drilling platform 1, a catwalk ramp 3 fixedly connected between the drilling platform 1 and the powered catwalk 2, a first row of pipe racks 4 and a second row of pipe racks 5 respectively on both sides of the powered catwalk 2, a ground iron drill 6 between the first row of pipe racks 4 and the powered catwalk 2, a fixed groove 7 opened along the length of the surface of the powered catwalk 2, a trolley 8 slidably connected in the fixed groove 7, catwalk pipe racks 9 fixedly connected on both sides of the powered catwalk 2, a wellhead 10 opened on the surface of the drilling platform 1, a derrick 11 fixedly connected on one side of the wellhead 10, a lifting mechanism 12 installed on the derrick 11, a buffer manipulator 21 fixedly connected to the lower section of the derrick 11, a drilling platform iron drill 13 also installed on the surface of the drilling platform 1, and a powered slip 27 fixedly connected in the wellhead 10.

[0018] The first row of pipe racks, group 4, is used to store unassembled single pipes, while the second row of pipe racks, group 5, is used to store assembled vertical pipes.

[0019] Ground drill 6 is used to complete the assembly of the support.

[0020] The fixing groove 7 on the power cat walkway 2 is a V-shaped groove, and a push plate that can push out the stand is installed in the fixing groove 7.

[0021] The power catwalk 2 stores the standpipe to be drilled. Driven by the trolley 8, the standpipe placed in the fixed slot 7 moves along the power catwalk 2 and the catwalk ramp 3. After the standpipe rises to the highest position, the lifting mechanism 12 and the buffer manipulator 21 work together to fix the standpipe and extend it into the wellhead to complete the drilling.

[0022] Example 2: like Figure 1 , Figure 2 and Figure 3As shown, the system includes a drilling platform 1, a powered catwalk 2 on one side of the drilling platform 1, a catwalk ramp 3 fixedly connected between the drilling platform 1 and the powered catwalk 2, a first row of pipe racks 4 and a second row of pipe racks 5 respectively on both sides of the powered catwalk 2, a ground iron drill 6 between the first row of pipe racks 4 and the powered catwalk 2, a fixed groove 7 opened along the length of the surface of the powered catwalk 2, a trolley 8 slidably connected in the fixed groove 7, catwalk pipe racks 9 fixedly connected on both sides of the powered catwalk 2, a wellhead 10 opened on the surface of the drilling platform 1, a derrick 11 fixedly connected on one side of the wellhead 10, a lifting mechanism 12 installed on the derrick 11, a buffer manipulator 21 fixedly connected to the lower section of the derrick 11, a drilling platform iron drill 13 also installed on the surface of the drilling platform 1, and a powered slip 27 fixedly connected in the wellhead 10.

[0023] The ground-based iron drill 6 includes two support frames 14 located between the first row of pipe racks 4 and the power catwalk 2. The two support frames 14 are arranged along the length of the power catwalk 2, and a clamp assembly 15 is provided between the two support frames 14. Hydraulic loading arms 16 are provided on both sides of the two support frames 14, and a transmission wheel 17 along its length is provided on the surface of the two support frames 14.

[0024] The hydraulic loading arms 16 on both sides of the support frame 14 have two states: one inside the support frame 14 and the other outside the support frame 14, overlapping the first row of pipe racks 4 or the second row of pipe racks 5. The hydraulic loading arms 16, through their rotation, can place uprights or single pipes from the first row of pipe racks 4 and the second row of pipe racks 5 into the support frame 14, or transport uprights and single pipes out of the support frame 14. The transfer wheels 17 can bring two single pipes to be installed closer together, facilitating the clamp assembly 15 to fix the two single pipes into an upright position, or can separate the uprights from the clamp assembly 15 to prevent unnecessary damage caused by collision when the hydraulic loading arms 16 transport single pipes.

[0025] Example 3: like Figure 1 , Figure 2 and Figure 3 As shown, the system includes a drilling platform 1, a powered catwalk 2 on one side of the drilling platform 1, a catwalk ramp 3 fixedly connected between the drilling platform 1 and the powered catwalk 2, a first row of pipe racks 4 and a second row of pipe racks 5 respectively on both sides of the powered catwalk 2, a ground iron drill 6 between the first row of pipe racks 4 and the powered catwalk 2, a fixed groove 7 opened along the length of the surface of the powered catwalk 2, a trolley 8 slidably connected in the fixed groove 7, catwalk pipe racks 9 fixedly connected on both sides of the powered catwalk 2, a wellhead 10 opened on the surface of the drilling platform 1, a derrick 11 fixedly connected on one side of the wellhead 10, a lifting mechanism 12 installed on the derrick 11, a buffer manipulator 21 fixedly connected to the lower section of the derrick 11, a drilling platform iron drill 13 also installed on the surface of the drilling platform 1, and a powered slip 27 fixedly connected in the wellhead 10.

[0026] The cat walkway pipe rack 9 has a first telescopic rod 18 fixedly connected to both ends.

[0027] The first telescopic rod 18 can change the tilt angle of the catwalk pipe rack 9 by adjusting its own length, thereby providing initial power for the movement of the upright or single pipe and completing the transfer of the upright or single pipe between the power catwalk 2 and the second pipe rack group 5 or the ground iron drill 6.

[0028] Example 4: like Figure 1 , Figure 2 and Figure 3 As shown, the system includes a drilling platform 1, a powered catwalk 2 on one side of the drilling platform 1, a catwalk ramp 3 fixedly connected between the drilling platform 1 and the powered catwalk 2, a first row of pipe racks 4 and a second row of pipe racks 5 respectively on both sides of the powered catwalk 2, a ground iron drill 6 between the first row of pipe racks 4 and the powered catwalk 2, a fixed groove 7 opened along the length of the surface of the powered catwalk 2, a trolley 8 slidably connected in the fixed groove 7, catwalk pipe racks 9 fixedly connected on both sides of the powered catwalk 2, a wellhead 10 opened on the surface of the drilling platform 1, a derrick 11 fixedly connected on one side of the wellhead 10, a lifting mechanism 12 installed on the derrick 11, a buffer manipulator 21 fixedly connected to the lower section of the derrick 11, a drilling platform iron drill 13 also installed on the surface of the drilling platform 1, and a powered slip 27 fixedly connected in the wellhead 10.

[0029] The first pipe rack group 4 and the second pipe rack group 5 are both composed of several pipe racks 19 arranged side by side, and the pipe racks 19 are all perpendicular to the power cat walkway 2. The two ends of the pipe racks 19 are equipped with second telescopic rods 20.

[0030] The second telescopic rod 20 can change the tilt angle of the pipe rack 19 by adjusting its own length, so that the upright or single pipe can move under the action of gravity and complete the transfer.

[0031] Example 5: like Figure 1 , Figure 2 and Figure 5As shown, the system includes a drilling platform 1, a powered catwalk 2 on one side of the drilling platform 1, a catwalk ramp 3 fixedly connected between the drilling platform 1 and the powered catwalk 2, a first row of pipe racks 4 and a second row of pipe racks 5 respectively on both sides of the powered catwalk 2, a ground iron drill 6 between the first row of pipe racks 4 and the powered catwalk 2, a fixed groove 7 opened along the length of the surface of the powered catwalk 2, a trolley 8 slidably connected in the fixed groove 7, catwalk pipe racks 9 fixedly connected on both sides of the powered catwalk 2, a wellhead 10 opened on the surface of the drilling platform 1, a derrick 11 fixedly connected on one side of the wellhead 10, a lifting mechanism 12 installed on the derrick 11, a buffer manipulator 21 fixedly connected to the lower section of the derrick 11, a drilling platform iron drill 13 also installed on the surface of the drilling platform 1, and a powered slip 27 fixedly connected in the wellhead 10.

[0032] The hoisting mechanism 12 includes a traveling hoist assembly 22 fixedly connected to the derrick 11, and a power hoist 23 fixedly connected to the lower part of the traveling hoist assembly 22.

[0033] The traveling crane assembly 22 fixes the vertical support by connecting one end of the vertical support and adjusts the height of the vertical support by moving up and down. The power lifting clamp 23 is used to connect the vertical support. The two work together to ensure that the vertical support is transported smoothly into the wellhead 10.

[0034] Example 6: like Figure 1 , Figure 2 and Figure 4 As shown, the system includes a drilling platform 1, a powered catwalk 2 on one side of the drilling platform 1, a catwalk ramp 3 fixedly connected between the drilling platform 1 and the powered catwalk 2, a first row of pipe racks 4 and a second row of pipe racks 5 respectively on both sides of the powered catwalk 2, a ground iron drill 6 between the first row of pipe racks 4 and the powered catwalk 2, a fixed groove 7 opened along the length of the surface of the powered catwalk 2, a trolley 8 slidably connected in the fixed groove 7, catwalk pipe racks 9 fixedly connected on both sides of the powered catwalk 2, a wellhead 10 opened on the surface of the drilling platform 1, a derrick 11 fixedly connected on one side of the wellhead 10, a lifting mechanism 12 installed on the derrick 11, a buffer manipulator 21 fixedly connected to the lower section of the derrick 11, a drilling platform iron drill 13 also installed on the surface of the drilling platform 1, and a powered slip 27 fixedly connected in the wellhead 10.

[0035] The drilling platform iron drill 13 includes an iron drill body 24 installed on the side of the drilling platform 1. A blowout preventer mud box 25 is fixedly connected to the side of the iron drill body 24 near the wellhead 10. An oiling assembly 26 is installed on one side of the iron drill body 24.

[0036] The drill string body 24 is used to connect the standoff to the tubing string in the well. The oiling assembly 26 can clean the threads of the tubing string in the well and apply oil, reducing friction and improving the sealing effect. The blowout preventer mud box 25 can wrap the joints of the tubing string during tripping and dismantling to prevent mud from spraying onto the drilling platform during dismantling, thereby improving the utilization rate of mud.

[0037] The present invention establishes the foundation on the ground using a ground-based iron driller 6 and a second row of pipe racks 5, and then uses a power catwalk 2 and a trolley 8 to transport the foundation to the drilling platform 1 for drilling operations. This eliminates the need to install a foundation-establishing system and a foundation-establishing box on the drilling platform 1 and the derrick 11, thus reducing the load on the drilling platform and the derrick.

[0038] How to use: During drilling operations: First, a single pipe is placed on the second row of pipe racks 5. Then, the second telescopic rod 20 corresponding to the pipe rack 19 in the second row of pipe racks 5 extends, causing the pipe rack 19 to tilt towards the ground drill side. Under the action of gravity, the single pipe rolls onto the hydraulic loading arm 16, which then transports the two single pipes into the support frame 14. Afterward, the conveyor wheel 17 aligns the two single pipes, and the clamp assembly 15 fixes the two single pipes to form a vertical support. Finally, the hydraulic loading arm 16, which is close to the power catwalk 2, transports the vertical support onto the catwalk pipe rack 9. The first telescopic rod 18 corresponding to the catwalk pipe rack 9 where the stand is located extends, causing the catwalk pipe rack 9 to tilt towards the fixed groove 7, and the stand rolls into the fixed groove 7. Then, the trolley 8 pushes the stand to move it to the designated position on the catwalk ramp 3. After that, the power hoist 23 is fixed to the upper end of the stand, and the traveling hoist assembly 22 moves upward to lift the stand. When the lower end of the stand leaves the power catwalk 2, the buffer manipulator 21 extends to fix the stand and works with the traveling hoist assembly 22 to move it to the center of the wellhead 10. While the stand is moving, the oiling assembly 26 cleans and oils the female joint at the upper end of the tubing string inside the well. Then, the traveling crane assembly 22 drives the stand down. After the stand is connected to the tubing string inside the well, the drill body 24 fixes the two together. Finally, the stand is lowered further down until its upper end is aligned with the wellhead 10, completing the drilling operation.

[0039] During drilling operations: First, the traveling block 22 connects to the tubing string inside the well. The power slips 27 open, and the traveling block 22 is raised until the stand is exposed on the drill rig 1. Then, the power slips 27 close to restrict the movement of the tubing string inside the well. Next, the blowout preventer mud box 25 engages the connection between the stand and the tubing string, while the drill body 24 separates the two. Then, the traveling block 22 moves upward, cooperating with the extension of the buffer manipulator 21 to push the stand to the catwalk ramp 3. When the lower end of the stand contacts the trolley 8, the connection between the buffer manipulator 21 and the traveling block 22 and the stand is disconnected.

[0040] The trolley 8 moves away from the end of the catwalk ramp 3, transferring the stand from the catwalk ramp 3 to the fixed slot 7 of the powered catwalk 2. At this point, the subsequent process is selected according to actual needs. When further drilling is required, the stand is pushed onto the second row of pipe racks 5 for temporary storage. When drilling is not required, the stand is pushed onto the catwalk pipe rack 9 near the ground drill 6. The first telescopic rod 18 corresponding to the catwalk pipe rack 9 causes the stand to roll onto the hydraulic loading arm 16, which then transfers the stand into the support frame 14. The clamp assembly 15 then separates the stand into two individual sections, which are then separated by the transfer wheel 17. Finally, the hydraulic loading arm 16 transfers the individual sections to the first row of pipe racks 4 for storage.

Claims

1. A drilling system with dual single-root support columns assembled on the ground, characterized in that, The system includes a drilling platform (1), a power catwalk (2) on one side of the drilling platform (1), a catwalk ramp (3) fixedly connected between the drilling platform (1) and the power catwalk (2), a first row of pipe racks (4) and a second row of pipe racks (5) respectively on both sides of the power catwalk (2), a ground iron drill (6) between the first row of pipe racks (4) and the power catwalk (2), a fixed groove (7) is opened along the length of the surface of the power catwalk (2), and a trolley (8) is slidably connected in the fixed groove (7). Catwalk pipe racks (9) are fixedly connected to both sides of the power catwalk (2). A wellhead (10) is opened on the surface of the drilling platform (1). A derrick (11) is fixedly connected to one side of the wellhead (10) on the surface of the drilling platform (1). A lifting mechanism (12) is provided on the derrick (11). A buffer manipulator (21) is fixedly connected to the lower section of the derrick (11). A drilling platform iron driller (13) is also provided on the surface of the drilling platform (1). A power slip (27) is fixedly connected inside the wellhead (10).

2. The drilling system with dual single-root erectors assembled on the ground according to claim 1, characterized in that, The ground iron drill (6) includes two support frames (14) set between the first row of pipe racks (4) and the power cat walkway (2). The two support frames (14) are arranged along the length of the power cat walkway (2), and a clamp assembly (15) is set between the two support frames (14). Hydraulic loading arms (16) are set on both sides of the two support frames (14), and a transmission wheel (17) along its length is set on the surface of the two support frames (14).

3. The drilling system with dual single-root erectors assembled on the ground according to claim 1, characterized in that, The cat walkway pipe rack (9) is fixedly connected to the first telescopic rod (18) at both ends.

4. The drilling system with dual single-root erectors assembled on the ground according to claim 1, characterized in that, The first pipe rack group (4) and the second pipe rack group (5) are both composed of several pipe racks (19) arranged side by side, and the pipe racks (19) are all perpendicular to the power cat walkway (2). The two ends of the pipe racks (19) are provided with second telescopic rods (20).

5. The drilling system with dual single-root erectors assembled on the ground according to claim 1, characterized in that, The lifting mechanism (12) includes a traveling hoist assembly (22) fixedly connected to the derrick (11), and a power hoisting clamp (23) is fixedly connected to the lower part of the traveling hoist assembly (22).

6. The drilling system with dual single-root erectors assembled on the ground according to claim 1, characterized in that, The drill rig iron drill (13) includes an iron drill body (24) installed on the side of the drill rig (1). A blowout preventer mud box (25) is fixedly connected to the side of the iron drill body (24) near the wellhead (10). An oiling assembly (26) is installed on one side of the iron drill body (24).

7. A drilling method for drilling pipe, characterized in that, The drilling system according to any one of claims 1-6 is specifically implemented according to the following steps: Step 1: Roll the two single pipes of the same group on the first row of pipe rack group (4) into the ground iron drill (6), and then start the ground iron drill (6) to combine the two single pipes to form a vertical root; Step 2: Control the ground driller (6) to move the stand to the adjacent catwalk pipe rack (9), and then start the corresponding first telescopic rod (18) to send the stand into the fixed groove (7); Step 3: Maintain the holding state of the power slips (27) inside the wellhead (10) on the tubing string inside the well; Step 4: Start the trolley (8) on the power cat track (2) to push the stand to the designated position. Then, the lifting mechanism (12) and the buffer manipulator (21) work together to send the stand to the top of the well string. Start the drill rig iron drill (13) to connect the stand and the well string. Release the power slip (27) and the lifting mechanism (12) lowers the stand into the wellhead (10).

8. A method for pulling up drill pipe, characterized in that, The drilling system according to any one of claims 1-6 is specifically implemented according to the following steps: Step 1: The lifting mechanism (12) lifts the stand-up bar out of the drilling platform (1), and the power slip (27) is used to hold the tubing string in the well. Then, the driller (13) on the drilling platform separates the stand-up bar from the tubing string. Step 2: The lifting mechanism (12) and the buffer robot (21) work together to push the stand to the catwalk ramp (3) and slowly lower the stand into the powered catwalk (2), and disconnect the stand from the lifting mechanism (12); Step 3: When no further drilling operations are required, push the stand to the ground iron drill (6), where the ground iron drill (6) will break the stand into individual units. Finally, push the individual units to the first row of pipe racks (4). When further drilling operations are required, push the stand to the second row of pipe racks (5) for storage.

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