Drilling and workover rig rotary crane

Abstract

This invention relates to the field of oilfield workover equipment, specifically a rotary overhead crane for drilling and workover rigs. It includes an overhead crane assembly at the top of the derrick, comprising an overhead crane arm and wire rope pulleys at both ends of the arm. The key feature is that the central two sides of the overhead crane assembly are rotatably connected to the derrick via rotating shafts, and the overhead crane assembly is connected to the derrick via a tilting cylinder. A notch is provided on one side of the derrick for the overhead crane assembly to rotate into and accommodate it. Next to the notch on the derrick is a telescopic locking cylinder for supporting the overhead crane assembly, with a bearing block connected to the front end of the locking cylinder. The overhead crane assembly employs a steerable movable connection, allowing the overhead crane arm to rotate along the length of the derrick during transport. The structure is compact and the operation is safe. During operation, the overhead crane assembly is arranged laterally and positioned by the locking cylinder and bearing block, resulting in a reasonable structure and safe and reliable use.

Description

Technical Field

[0001] This invention relates to the field of oilfield workover equipment, specifically the rotary crane for drilling and workover rigs. Background Technology

[0002] In existing technologies, vehicle-mounted workover rigs, drilling / workover rigs, or well-cleaning rigs are the most basic and primary power sources for well workover and downhole operations. They typically consist of a truck chassis, engine, transmission, derrick, overhead crane assembly at the top of the derrick, and winch drum assembly. A wire rope passes around the overhead crane assembly and connects to the winch drum assembly and traveling block hook. The rotation of the winch drum assembly drives the traveling block hook to rise and fall. The derrick is usually tilted, meaning it is deflected at a certain angle towards the wellhead. The overhead crane assembly is fixedly connected to the top of the derrick, ensuring that the overhead crane, traveling block hook, and wellhead are aligned on a centerline, achieving a certain space between the wellhead and the rear of the vehicle, meeting the safety requirements for wellhead operators and tools. With the increasing complexity and diversity of well workover operations, a vertical derrick is designed for vehicle-mounted workover rigs, perpendicular to the vehicle body. To ensure sufficient operating space at the wellhead, the overhead crane pulleys must be located at both ends of the overhead crane arm, which is relatively long in the lateral direction, making transportation inconvenient. On a full cab chassis, in order to ensure the vehicle can move smoothly, the overhead crane must be screwed into the derrick body. Summary of the Invention

[0003] The purpose of this invention is to provide a reliable and easily movable rotary crane for drilling and workover rigs, addressing the aforementioned shortcomings.

[0004] The technical solution of the present invention is: a rotating derrick for drilling and workover rigs, including a derrick assembly at the top of the derrick, the derrick assembly including a derrick arm and wire rope pulleys at both ends of the derrick arm, the derrick assembly being connected to the derrick via a tilting cylinder, characterized in that the middle part of the derrick assembly is rotatably connected to the derrick via a rotating shaft; a notch is provided on one side of the derrick for the derrick assembly to rotate into and accommodate; a locking cylinder is provided next to the notch on the derrick for telescopic support of the derrick assembly, and a bearing block is connected to the front end of the locking cylinder.

[0005] The above plan also includes:

[0006] Next to the opening on the derrick, there is a pair of horizontally retractable locking cylinders used to support the overhead crane assembly.

[0007] The front of the load-bearing block has a slope, and when the overhead crane assembly is in its horizontal position, there is a positioning block that contacts the slope of the load-bearing block.

[0008] When the overhead crane assembly is in its vertical position, there is a positioning seat that contacts the load-bearing block.

[0009] The crane assembly is connected to the derrick on both sides by two tilting cylinders.

[0010] The locking cylinder consists of a cylinder body and an extended piston rod, with the front end of the piston rod connected to the bearing block via a ball head.

[0011] The advantages of this invention are: 1. The overhead crane assembly adopts a steerable movable connection, allowing the crane arm to be rotated within the length direction of the derrick during transport, resulting in a compact structure and safe operation. 2. During operation, the overhead crane assembly is arranged laterally and positioned using locking cylinders and bearing blocks, resulting in a reasonable structure and safe and reliable use. 3. The locking cylinder and bearing block are connected by ball joints to achieve universal joints, avoiding damage to parts due to excessive local stress. 4. Positioning blocks are installed on the overhead crane frame, effectively preventing the overhead crane from rotating during vehicle movement, resulting in a simple structure and high safety and reliability.

[0012] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a simplified structural diagram of the working state of the present invention.

[0014] Figure 2 yes Figure 1 Simplified diagram of the left-side view structure.

[0015] Figure 3 This is a simplified diagram of the transportation state structure of the present invention.

[0016] Figure 4 yes Figure 3 Simplified structural diagram viewed from below.

[0017] Figure 5 This is a simplified structural diagram of the vehicle in its transportation state according to the present invention.

[0018] Figure 6 This is a simplified diagram of the positioning seat structure.

[0019] Figure 7 yes Figure 6 Simplified structural diagram (left view).

[0020] Figure 8 This is a simplified diagram of the ball head structure. Detailed Implementation

[0021] See Figure 1 -8. The component names are as follows: 1. Overhead crane assembly, 2. Slide rail, 3. Positioning seat, 4. Tilting cylinder, 5. Shaft, 6. Locking cylinder, 7. Bearing block, 8. Positioning block, 9. Notch, 10. Piston rod, 11. Ball head, 12. Overhead crane arm, 13. Wire rope pulley, 14. Automobile chassis.

[0022] See Figure 1-8. The drilling rig rotating trolley includes a trolley assembly 1 at the top of the derrick 6. The trolley assembly 1 includes a trolley arm 13 and wire rope pulleys 14 at both ends of the trolley arm 13. The middle of the trolley assembly 1 (trolley arm 13) is rotatably connected to the derrick 6 trolley seat via a rotating shaft 5, allowing the trolley assembly 1 to rotate. The two sides of the trolley assembly 1 are connected to the derrick 6 via two tilting cylinders 4, which serve as the power source for the rotation of the trolley assembly 1. There is a notch 10 on one side of the derrick 6 for the trolley assembly 1 to rotate into and accommodate it, providing space for the trolley assembly 1 to change from a lateral position to parallel with the derrick 6. Next to the notch 10 on the derrick 6, there is a pair of laterally retractable locking cylinders 7 for supporting the trolley assembly 1, achieving lateral positioning of the trolley assembly 1. The front end of the locking cylinder 7 is connected to a bearing block 8 to block the trolley assembly 1. The front of the bearing block 8 has a bevel, and when the overhead crane assembly 1 is in its horizontal position, there is a positioning block 9 (also with a bevel) that contacts the bevel of the bearing block 8, thus achieving a tighter and tighter fixation of the overhead crane assembly 1. When the overhead crane assembly 1 is in its vertical position (i.e., in the traveling state), there is a positioning seat 3 that contacts the bevel of the bearing block 8. The locking cylinder 7 can achieve positioning and locking of the overhead crane assembly 1 in both its working and traveling positions.

[0023] See Figure 2 , 8 The locking cylinder 7 consists of a cylinder body and an extended piston rod 11. A hole is drilled from top to bottom at the rear end of the support block 8. The ball head 12 at the front end of the piston rod 11 is placed inside the hole in the support block 8. The support block can be positioned around the slide rail 2. Thus, the movement of the support block 8 within the slide rail 2 is achieved through the extension and retraction of the piston rod 11. The ball head 12 structure is designed to ensure a more reasonable movement of the support block 8 within the slide rail 2 and reduce jamming during movement.

[0024] The above description is merely a specific embodiment of the present invention, and the various examples do not constitute a limitation on the substantive content of the present invention.

Claims

1. A rotating overhead crane for drilling and workover rigs, comprising a crane assembly (1) at the top of a derrick (6), the crane assembly (1) comprising a crane arm (13) and wire rope pulleys (14) at both ends of the crane arm (13), the crane assembly (1) being connected to the derrick (6) via a tilting cylinder (4), characterized in that The middle part of the overhead crane assembly (1) is rotatably connected to the derrick (6) via a pivot (5). On one side of the derrick (6), there is a notch (10) for the overhead crane assembly (1) to rotate into and accommodate. Next to the notch (10) on the derrick (6), there is a telescopic locking cylinder (7) for supporting the overhead crane assembly (1). The front end of the locking cylinder (7) is connected to a bearing block (8). Next to the notch (10) on the derrick, there is a pair of horizontally telescopic locking cylinders (7) for supporting the overhead crane assembly (1). The front part of the bearing block (8) has a slope, and when the overhead crane assembly (1) is in its horizontal position, there is a positioning block (9) that contacts the slope of the bearing block (8).

2. The rotary overhead crane of the drilling and workover rig according to claim 1, characterized in that... The crane assembly (1) is connected to the derrick (6) on both sides by two tilting cylinders (4).

3. The rotating overhead crane of the drilling and workover rig according to claim 2, characterized in that... The locking cylinder (7) consists of a cylinder body and an extended piston rod (11). The front end of the piston rod (11) is connected to the bearing block (8) through a ball head (12).

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