Derrick Installation and Construction Method

Abstract

This invention relates to a derrick installation method, which is suitable for drilling rigs and workover rigs in shallow and medium-depth wells that require frequent relocation, especially for equipment using modular derricks. This method significantly improves installation and dismantling efficiency, reduces hoisting costs, and minimizes transport trips. The invention employs a drilling winch to lift the bottom and top sections of the derrick via an A-frame, while the remaining sections are also lifted using the drilling winch. The invention offers the following advantages: only a small-tonnage hoisting device is needed for hoisting, resulting in lower hoisting costs; the overhead crane, traveling block, drilling wire rope, and top section of the derrick are installed and transported as a single unit, leading to high installation and dismantling efficiency; and the bottom and top sections of the derrick are hoisted horizontally, eliminating the need for tipping and ensuring high safety.

Description

Technical Field

[0001] This invention relates to the field of drilling and workover equipment technology in oil and gas extraction, and specifically to a method for derrick installation. Background Technology

[0002] Currently, the installation of vertical derrick sets requires heavy-duty hoisting equipment to flip the bottom and top sections of the derrick from horizontal to vertical and install them on the base. The overhead crane, traveling block, and drilling wire rope need to be disassembled from the top section of the derrick and transported separately, resulting in high hoisting costs and low disassembly and installation efficiency.

[0003] The main problems with existing technologies are: 1. At least two lifting devices are required for the flipping, and one of the lifting devices needs to have a large lifting capacity; 2. There are many transport trips, resulting in low dismantling and installation efficiency. Summary of the Invention

[0004] To address the above problems, this invention provides a method for installing a derrick, which requires only a small-tonnage hoisting device, significantly improving dismantling and installation efficiency, reducing hoisting costs, and minimizing transport trips.

[0005] The technical solution adopted in this invention is: a method for installing a derrick, characterized by the following steps:

[0006] S1. Install the derrick legs, rotating cathead, drilling winch and bracket on the base. Install the buffer cylinder in the A-frame on the ground. Use hoisting equipment to vertically install the A-frame on the derrick legs and fix it with pins.

[0007] S2. After assembling the bottom section of the derrick and all its accessories on the ground, the bottom section of the derrick is horizontally hoisted onto the drilling platform. The tail end is connected to the derrick support leg on the base, and the middle part is placed on the support.

[0008] S3. Horizontally hoist the top section of the derrick and fit it with the bottom section of the derrick. Use locking pins to fix the top section of the derrick inside the bottom section of the derrick.

[0009] S4. Install pulley block I, pulley block II and hoisting rope. One end of the hoisting rope is fixed to the A-frame, and the other end is connected to the drilling winch. The hoisting rope passes through the pulley to avoid the A-frame structure.

[0010] S5. Use the drilling winch to rotate the derrick base and the top section of the derrick counterclockwise. When it is close to the upright position, use the buffer cylinder to smoothly position it and fix the A-frame to the bottom section of the derrick.

[0011] S6. Horizontally hoist section III of the derrick and suspend section III below the top section of the derrick;

[0012] S7. Release the steel wire rope inside the rotating cat head and connect it to the lower part of section III of the derrick. Take the pulley block I out of the A-frame and lower the pulley block I to the vicinity of the base platform.

[0013] S8. Use the rotating cat head to pull the derrick section III to an upright position, and install the connecting pin between the derrick section III and the top section of the derrick. Connect the pulley block I to the lower end of the derrick section III.

[0014] S9. Start the drilling winch to suspend the top section and section III of the derrick, open the locking pin to release the fixation between the top section and the A-frame, and when the drilling winch lifts section III of the derrick to the designated position, close the locking pin. The locking pin fixes the top section and section III of the derrick to the A-frame.

[0015] S10. Hoist and lift section II of the derrick, following the same steps as the installation of section III of the derrick;

[0016] S11. Hoist and lift section I of the derrick, following the same steps as the installation of section III of the derrick; complete the installation of the main derrick body.

[0017] The beneficial effects of this invention are as follows: This invention is applicable to drilling rigs and workover rigs with high relocation frequency in shallow and medium-depth wells, especially for equipment using modular derricks, significantly improving dismantling and installation efficiency, reducing hoisting costs, and minimizing transport trips; this invention uses a drilling winch to lift the bottom and top sections of the derrick via an A-frame, while the remaining sections of the derrick are lifted using the drilling winch; this invention has the following advantages:

[0018] 1. Only one small-tonnage hoisting device is needed for hoisting, resulting in lower hoisting costs;

[0019] 2. The overhead crane, traveling trolley, drilling wire rope, and top section of the derrick are installed and transported as a whole, resulting in high efficiency in dismantling and installation;

[0020] 3. The bottom and top sections of the derrick are hoisted horizontally, without any overturning operation, ensuring high safety. Attached Figure Description

[0021] Figure 1-11 This is a schematic diagram of the derrick installation according to the present invention;

[0022] In the diagram: 1. A-frame; 2. Bottom section of derrick; 3. Section I of derrick; 4. Section II of derrick; 5. Section III of derrick; 6. Top section of derrick; 7. Derrick support legs; 8. Buffer cylinder; 9. Rotating cathead; 10. Drilling winch; 11. Base; 12. Support; 13. Locking pin; 14. Pulley block I; 15. Pulley block II; 16. Hoisting rope; 17. Transfer pulley; 18. Wire rope; 19. Connecting pin; 20. Second-level platform. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The present invention provides a method for installing a derrick, characterized by comprising the following steps:

[0026] S1, such as Figure 1 As shown, the derrick support 7, rotating cat head 9, drilling winch 10 and bracket 12 are installed on the base 11. The buffer cylinder 8 is installed in the A-frame 1 on the ground. The A-frame 1 is vertically installed on the derrick support 7 using hoisting equipment and fixed with pins.

[0027] S2, such as Figure 2 As shown, after assembling the derrick bottom section 2 and all accessories on the derrick bottom section 2 on the ground, the derrick bottom section 2 is horizontally hoisted onto the drilling platform. The tail of the derrick bottom section 2 is connected to the derrick support leg 7 on the base 11, and the middle part is placed on the bracket 12.

[0028] S3, such as Figure 3 As shown, the top section 6 of the derrick is horizontally hoisted and fitted together with the bottom section 2 of the derrick, and the top section 6 of the derrick is fixed inside the bottom section 2 of the derrick using locking pins 13;

[0029] S4, such as Figure 4 As shown, pulley block I 14, pulley block II 15 and hoisting rope 16 are installed. One end of hoisting rope 16 is fixed to the A-frame 1 and the other end is connected to the drilling winch 10. Hoisting rope 16 passes through pulley 17 to avoid the A-frame structure.

[0030] S5, such as Figure 5 As shown, the drilling winch 10 is used to rotate the derrick base 2 and the derrick top section 6 counterclockwise around the pin on the derrick support 7. When the derrick base 2 and the derrick top section 6 are rotated to a near-vertical position, the buffer cylinder 8 is used to smoothly position them and fix the A-frame 1 to the derrick base 2.

[0031] S6, such as Figure 6 As shown, the derrick section III 5 is horizontally hoisted and suspended below the top section 6 of the derrick.

[0032] S7, such as Figure 7 As shown, release the steel wire rope 18 inside the rotating cat head 9 and connect it to the lower part of the derrick section III 5. Remove the pulley block I14 from the A-frame 1 and lower the pulley block I14 to the vicinity of the base 11 platform.

[0033] S8, such as Figure 8 As shown, use the rotating cat head 9 to pull the derrick section III 5 to an upright position (derrick section III 5 is connected to the top section 6 of the derrick), and install the connecting pin 19 between derrick section III 5 and the top section 6 of the derrick. The pulley block I 14 is connected to the lower end of derrick section III 5.

[0034] S9, such as Figure 9 As shown, the drilling winch 10 is started to suspend the top section 6 and the third section 5 of the derrick. The locking pin 13 is opened to release the top section 6 of the derrick from the A-frame 1. When the drilling winch 10 lifts the third section 5 of the derrick to the designated position through the hoisting rope 16 and the pulley block, the locking pin 13 is closed. The locking pin 13 fixes the top section 6 and the third section 5 of the derrick to the A-frame 1.

[0035] S10, such as Figure 10 As shown, hoist and lift section II 4 of the derrick, following the same steps as the installation of section III 5 of the derrick (i.e., steps S6-S9);

[0036] S11, such as Figure 11 As shown, hoist and lift section I 3 of the derrick, following the same steps as the installation of section III 5 of the derrick (i.e., steps S6-S9); complete the installation of the main derrick body.

[0037] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0038] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A method for installing a derrick, characterized in that: Includes the following steps: S1. Install the derrick legs, rotating cathead, drilling winch, and support on the base. The rotating cathead and drilling winch are located on one side of the derrick legs, and the support is located on the other side of the derrick legs. After installing the buffer cylinder inside the A-frame on the ground, use hoisting equipment to vertically install the A-frame on the derrick legs and fix it with pins. S2. After assembling the bottom section of the derrick and its accessories on the ground, the bottom section of the derrick is horizontally hoisted onto the drilling platform. The tail end is connected to the derrick support leg on the base, and the middle part is placed on the support. S3. Horizontally hoist the top section of the derrick and fit it with the bottom section of the derrick. Use locking pins to fix the top section of the derrick inside the bottom section of the derrick. S4. Install the pulley assembly. One end of the hoisting rope is fixed to the A-frame, and the other end passes through the pulley assembly and is connected to the drilling winch. The pulley assembly includes pulley block I and pulley block II. Pulley block I is installed on the top of the A-frame, and pulley block II is installed on the top of the bottom section of the derrick. One end of the hoisting rope is fixed to the A-frame, and the other end passes through pulley block II and pulley block I in sequence and is connected to the drilling winch. S5. Use the drilling winch to rotate the derrick base and the top section of the derrick as a whole around the derrick legs to the upright position, and fix the A-frame to the bottom section of the derrick. S6. Horizontally hoist section III of the derrick and suspend section III below the top section of the derrick; S7. Release the steel wire rope inside the rotating cat head and connect it to the lower part of section III of the derrick. Take the pulley block I out of the A-frame and lower the pulley block I to the vicinity of the base platform. S8. Use the rotating cat head to pull the derrick section III to an upright position, and install the connecting pin between the derrick section III and the top section of the derrick. Connect the pulley block I to the lower end of the derrick section III. S9. Start the drilling winch to suspend the top section and section III of the derrick, open the locking pin to release the fixation between the top section and the A-frame, and when the drilling winch lifts section III of the derrick to the designated position, close the locking pin. The locking pin fixes the top section and section III of the derrick to the A-frame. S10. Repeat steps S6-S9 to hoist and lift section II and section I of the derrick in sequence to complete the installation of the main derrick body.

2. The derrick installation construction method according to claim 1, characterized in that: A buffer cylinder is installed on the upper part of the A-frame.

3. The derrick installation construction method according to claim 2, characterized in that: In step S5, the drilling winch is used to drive the derrick base and the top section of the derrick to rotate around the derrick support legs. When it is close to the upright position, the buffer cylinder is used to smoothly position it.

4. The derrick installation construction method according to claim 1, characterized in that: The pulley assembly also includes a guide pulley, which is mounted on top of the A-frame, and the lifting rope passes through the guide pulley to avoid the A-frame.

5. The derrick installation construction method according to claim 1, characterized in that: The upper part of section II of the derrick is equipped with a two-tiered platform.

6. The derrick installation construction method according to claim 1, characterized in that: Suitable for vertical assembly derricks.

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