Light full-hydraulic control ocean workover rig

Abstract

The light full-hydraulic control ocean workover rig comprises a light derrick, a hydraulic top drive and two lifting oil cylinders are arranged in the light derrick, and the two lifting oil cylinders are symmetrically distributed on the left side and the right side in the light derrick; a three-joint unit box and a racking platform pipe arranging device are arranged behind the light derrick, and a driller room is arranged in front of the light derrick. The workover rig solves the problems that in the prior art, an ocean workover rig is multiple in corollary equipment, complex to operate and maintain, large in size and heavy in weight.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum engineering equipment and relates to a light fully hydraulically controlled marine workover rig. Background Art

[0002] Most of the existing offshore workover rigs are driven by AC variable frequency motors, which are characterized by fully electric AC variable frequency control. The system structure is relatively complex, and the technical level of operators and maintenance personnel is required to be high. The entire set of traveling and hoisting system consists of a derrick, a winch, a crown block, a traveling block and a drilling wire rope. The system has many components and is relatively complex to operate and maintain. At the same time, the derrick needs to bear the entire weight of the tubing in the well, which also makes the overall structure of the derrick larger and heavier. In terms of the layout of the drilling platform equipment, in order to enable the operators in the driller's room to observe the drilling surface more comprehensively, the driller's room needs to be placed inside the derrick legs, or the opening of the lower legs of the derrick needs to be increased, which also increases the area of ​​the drilling surface.

[0003] At present, there are two main forms of stand discharge on offshore drilling and repair equipment. One is to arrange the second-floor platform and the stand box on the front side of the derrick. In this arrangement, in order for the operators in the driller's room to observe the wellhead, the driller's room needs to be placed on the inside of the derrick legs, so the left and right openings at the bottom of the derrick need to be enlarged. If the driller's room is placed outside the derrick, the operators in the driller's room need to observe the wellhead from between the gaps in the derrick. In order to avoid the derrick blocking the line of sight, the space at the bottom of the derrick needs to be enlarged. The above two arrangements of the driller's room will increase the weight of the derrick and the area of ​​the drilling platform. At the same time, the operator's line of sight in the driller's room is blocked by the pipe string stand, and it is impossible to observe the operation of the equipment at the front of the well site, making it difficult for the operators in the driller's room to take into account the operation of the equipment in the entire well site. Another arrangement is not to set up a second-layer platform on the derrick, and not to set up a stand box on the drilling floor. Instead, a single pipe string or stand is placed horizontally on the drilling floor or deck, or a single pipe string or stand is placed in a drill pipe box, and then the drill pipe box is placed on the drilling floor or deck. This type of pipe string placement greatly increases the area of ​​the drilling floor or deck, and is usually used for shallow drilling / repairing depths, that is, when there are fewer pipe strings. At the same time, during the tripping operation, the pipe string needs to be taken out of the well and then placed on the drilling floor or deck, which also greatly reduces the operating efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a light fully hydraulically controlled marine workover rig, which solves the problems of the marine workover rig in the prior art, such as the large number of supporting equipment, complex operation and maintenance, large size and heavy weight.

[0005] The technical solution adopted by the present invention is a light fully hydraulically controlled marine well repair rig, including a light derrick, in which a hydraulic top drive and two lifting cylinders are arranged, and the two lifting cylinders are symmetrically distributed on the left and right sides of the light derrick; a root box and a second-layer platform pipe arrangement device are arranged at the rear of the light derrick, and a driller's room is arranged in front of the light derrick.

[0006] The present invention is also characterized in that:

[0007] The light derrick is installed on a base, and a base sliding device is arranged under the base.

[0008] The hydraulic top drive includes a top drive guide frame and a hydraulic elevator. The hydraulic top drive moves up and down along the guide rails on the light derrick through the top drive guide frame.

[0009] The lower end of the cylinder barrel of the lifting cylinder is fixed to the lower side of the light derrick, and a lifting pulley block is arranged at the top end of the piston rod of the lifting cylinder. A drilling wire rope is arranged on the lifting pulley block. One end of the drilling wire rope is fixed to the lower side of the light derrick, and the other end passes around the lifting pulley block and is connected to the top drive guide frame of the hydraulic top drive.

[0010] An iron roughneck is arranged on one side at the lower interior of the light derrick.

[0011] The driller room adopts dual driller control mode.

[0012] A hydraulic turntable and power slips are provided at the wellhead of the drilling rig.

[0013] The workover rig also includes a manifold, which is divided into two parts: a drilling fluid manifold and a throttling and well-killing manifold. Both are arranged on the drilling floor, and the two are arranged according to the weight distribution of the equipment on the drilling floor to evenly distribute the weight of each equipment on the drilling floor.

[0014] The workover rig also includes a pipe grabber and a power catwalk. Tracks or rollers are arranged below the power catwalk so that the power catwalk can translate along with the workover rig as a whole.

[0015] The beneficial effects of the present invention are:

[0016] The workover rig of the present invention uses a lifting cylinder, a lifting pulley block and a drilling wire rope to form a lifting system, replacing the traditional travel suspension system composed of a winch, a crown block, a derrick, a traveling block and a wire rope. The entire lifting system has the characteristics of simple configuration, light weight, large lifting force and convenient maintenance. The light derrick only plays a role in straightening the lifting cylinder and the lifting pulley block, and does not bear the load of the pipe string in the well, which can greatly reduce the weight of the derrick. The root box is arranged on the rear side of the light derrick, that is, the drill pipe root is arranged on the rear side of the derrick, and the driller's room is arranged on the front side of the derrick. The operator in the driller's room has a wide field of vision and can clearly observe the status of the wellhead, the operation of the pipe string and the pipe string yard. The workover rig of the present invention integrates the power sources of all hydraulic actuators into one, which is convenient for overall maintenance. The power source is not placed on the drilling floor, which greatly reduces the weight of the drilling floor and makes the layout of the drilling floor equipment more concise. The whole set of equipment adopts full hydraulic control, there is no electrical equipment on the drilling floor, and the operation is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the workover rig of the present invention;

[0018] Figure 2 It is a side view of the workover rig of the present invention;

[0019] Figure 3 A top view of the workover rig of the present invention;

[0020] Figure 4 It is a schematic diagram of the state of a single drill pipe being transported by a power catwalk when using the workover rig of the present invention;

[0021] Figure 5 It is a schematic diagram of the state in which the top drive slips tilt forward and suspend a single drill pipe when the workover rig of the present invention is used;

[0022] Figure 6 It is a schematic diagram of the state in which the top drive slip is swung to the wellhead to suspend a single drill pipe when the workover rig of the present invention is used;

[0023] Figure 7 It is a schematic diagram of the state of lowering a single drill pipe to the wellhead when using the workover rig of the present invention;

[0024] Figure 8 A schematic diagram of the state of establishing a root at the wellhead when using the well repair machine of the present invention;

[0025] Fig. 9 It is a schematic diagram of the state of lifting a whole stand out of a wellhead when using the workover rig of the present invention;

[0026] Fig.10 It is a schematic diagram of the state of the top drive slips and the second-layer platform pipe arrangement device connecting the stand when the workover rig of the present invention is used;

[0027] Fig.11It is a schematic diagram of the state of the second-layer platform pipe arrangement device and the drilling platform manipulator arranging pipe stands when using the well repair rig of the present invention.

[0028] In the figure, 1. light derrick, 2. lifting cylinder, 201. lifting pulley block, 3. wire rope, 4. hydraulic top drive, 401. top drive guide frame, 402. hydraulic elevator, 5. second-layer platform pipe arrangement device, 501. second-layer platform, 6. iron driller, 7. pipe string yard, 8. base, 801. base sliding device, 802. root box, 9. power catwalk, 10. pipe grabber, 11. hydraulic turntable, 12. power slips, 13. driller's room, 14. hydraulic winch, 15. drilling fluid manifold, 16. throttling and well-killing manifold, 17. drilling platform manipulator, 18. drill pipe. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] The structure of the light full hydraulic controlled marine workover rig of the present invention is as follows: Figures 1 to 3 As shown, it includes a light derrick 1, in which a hydraulic top drive 4 and two lifting cylinders 2 are arranged, and the two lifting cylinders 2 are symmetrically distributed on the left and right sides of the light derrick 1; a root box 802 and a second-layer platform pipe arrangement device 5 are arranged at the rear of the light derrick 1, and a driller's room 13 is arranged in front of the light derrick 1.

[0032] Example 2

[0033] On the basis of Example 1, a light derrick 1 is installed on a base 8 , and a base sliding device 801 is provided below the base 8 .

[0034] The hydraulic top drive 4 includes a top drive guide frame 401 and a hydraulic elevator 402 . The hydraulic top drive 4 moves up and down along the guide rail on the light derrick 1 through the top drive guide frame 401 .

[0035] Example 3

[0036] The structure of the light full hydraulic controlled marine workover rig of the present invention is as follows: Figures 1 to 3As shown, it includes a light derrick 1, and the light derrick seat is installed on the base 8 by bolts or pins. A hydraulic top drive 4 is arranged in the light derrick 1, and the hydraulic top drive 4 includes a top drive guide frame 401 and a hydraulic elevator 402. Two lifting cylinders 2 are arranged in the light derrick 1, and the two lifting cylinders 2 are symmetrically distributed on the left and right sides of the light derrick 1. The lower end of the cylinder barrel of the lifting cylinder 2 is fixed to the lower side of the light derrick 1, and the top of the piston rod of the lifting cylinder 2 is provided with a lifting pulley block 201, and the lifting pulley block 201 moves with the extension and retraction of the piston rod. A drilling wire rope 3 is arranged on the lifting pulley block 201, one end of the drilling wire rope 3 is fixed to the lower side of the light derrick 1, and the other end bypasses the lifting pulley block 201 and is connected to the top drive guide frame 401 of the hydraulic top drive 4, and the hydraulic top drive 4 moves up and down along the guide rail on the light derrick 1 through the top drive guide frame 401.

[0037] A stand box 802 and a second-layer platform pipe arrangement device 5 are arranged at the rear of the light derrick 1 . The second-layer platform pipe arrangement device 5 includes a second-layer platform 501 .

[0038] A hydraulic rotary table 11 and a power slip 12 are provided at the wellhead of the drilling floor. The iron roughneck 6 is arranged on one side of the lower part of the light derrick 1 to save the space of the drilling floor. In order to evenly distribute the weight of the equipment on the drilling floor, the manifold is divided into two parts: a drilling fluid manifold 15 and a throttling and well-killing manifold 16, which can be arranged according to the weight distribution of the equipment on the drilling floor. The hydraulic winch 14 is arranged on the drilling floor and is used for auxiliary lifting operations of equipment such as pipe strings and tools.

[0039] A pipe grabber 10 is arranged on the pipe pile yard 7, and a power catwalk 9 is arranged between the pipe pile yard 7 and the drilling floor. When the workover rig is moved horizontally, the power catwalk 9 can be moved along with the workover rig.

[0040] A driller's room 13 is arranged in front of the light derrick 1. The driller's room 13 adopts a dual driller control mode. The main driller can clearly observe the wellhead, and the assistant driller can observe the operating status of the pipe pile yard 7, the power catwalk 9 and the pipe grabber 10 while observing the wellhead.

[0041] When the workover rig of the present invention is in operation, Figure 4 As shown, the pipe grabber 10 grabs a single drill pipe 18 from the pipe pile 7 and sends it to the power catwalk 9, and the driller's room 13 controls the power catwalk 9 to transport the pipe to the wellhead; Figure 5 As shown, the lifting cylinder 2 drives the hydraulic top drive 4 to drop to the position of the drill pipe 18 through the drilling wire rope 3, and the hydraulic top drive 4 drives the hydraulic elevator 402 to tilt forward and clamp the drill pipe 18, and then the lifting cylinder 2 drives the hydraulic top drive 4 to rise through the drilling wire rope 3; Figure 6 As shown, the hydraulic top drive 4 then drives the hydraulic elevator 402 to swing the drill pipe 18 back to the center of the wellhead; Figure 7As shown, the lower end of the drill pipe 18 is supported by the drilling floor manipulator 17 and aligned with the wellhead. After the hydraulic top drive 4 continues to lower the drill pipe 18 to a certain depth, the wellhead power slip 12 is closed and the drill pipe 18 is clamped; Figure 8 As shown, the above actions are repeated, the hydraulic top drive 4 drives the hydraulic elevator 402 to suspend the second drill pipe 18 to the center of the wellhead, the male joint at the lower end of the second drill pipe 18 is supported by the drilling floor manipulator 17 to align with the female joint of the first drill pipe 18, and the iron roughneck 6 completes the buckling of the second drill pipe and the establishment of the stand; Fig. 9 As shown, the lifting cylinder 2 drives the hydraulic top drive 4 to rise through the drilling wire rope 3, and the hydraulic elevator 402 suspends all the roots and lifts them out of the wellhead; Fig.10 As shown, the hydraulic top drive 4 then drives the hydraulic elevator 402 to rotate 180° and tilt the hydraulic elevator 402 backward, and the second-layer platform pipe arrangement device 5 extends and clamps the stand; Fig.11 As shown, the hydraulic elevator 402 is opened, and the second-layer platform pipe arrangement device 5 suspends the pipe stands and places them at the designated position of the second-layer platform 501, thereby completing the laying operation of a single pipe.

[0042] During the drilling operation, the hydraulic elevator 402 is opened, the second-level platform pipe arrangement device 5 suspends a single pipe from the specified position of the second-level platform 501 and hands it over to the hydraulic elevator 402, the lower end of the drill pipe stand is supported by the drilling platform manipulator 17 and aligned with the wellhead, and the iron roughneck 6 completes the stand buckling operation.

[0043] During the drilling operation, the hydraulic elevator 402 suspends the drill pipe stand and lifts it out of the wellhead. After the iron roughneck 6 is used to detach the buckle, the hydraulic elevator 402 tilts back, the second-layer platform pipe arrangement device 5 extends out and clamps the stand, then the hydraulic elevator 402 opens, the second-layer platform pipe arrangement device 5 suspends the stand and places it to the specified position of the second-layer platform 501, completing the placement of a single stand.

[0044] All equipment on the drilling floor moves with the workover rig as a whole. The workover rig as a whole is moved by the base sliding device 801 under the base 8. During the movement, the power catwalk 9 moves with the workover rig as a whole by means of tracks or rollers.

Claims

1. Lightweight fully hydraulic controlled offshore workover rig, characterized in that: The invention comprises a light derrick (1), wherein a hydraulic top drive (4) and two lifting cylinders (2) are arranged inside the light derrick (1), and the two lifting cylinders (2) are symmetrically distributed on the left and right sides of the light derrick (1); a stand box (802) and a second-layer platform pipe arrangement device (5) are arranged at the rear of the light derrick (1), and a driller's room (13) is arranged in front of the light derrick (1).

2. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: The light derrick (1) is installed on a base (8), and a base sliding device (801) is arranged below the base (8).

3. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: The hydraulic top drive (4) comprises a top drive guide frame (401) and a hydraulic elevator (402). The hydraulic top drive (4) moves up and down along the guide rail on the light derrick (1) via the top drive guide frame (401).

4. The lightweight fully hydraulically controlled offshore workover rig according to claim 3, characterized in that: The lower end of the cylinder barrel of the lifting cylinder (2) is fixed to the lower side of the light derrick (1), and a lifting pulley block (201) is arranged at the top end of the piston rod of the lifting cylinder (2). A drilling wire rope (3) is arranged on the lifting pulley block (201). One end of the drilling wire rope (3) is fixed to the lower side of the light derrick (1), and the other end passes around the lifting pulley block (201) and is connected to the top drive guide frame (401) of the hydraulic top drive (4).

5. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: An iron roughneck (6) is arranged on one side of the lower interior of the light derrick (1).

6. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: The driller's room (13) adopts a dual driller control method.

7. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: A hydraulic rotary table (11) and a power slip (12) are arranged at the wellhead of the drilling platform of the well repair machine.

8. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: The workover rig also includes a manifold, which is divided into two parts: a drilling fluid manifold (15) and a throttling and well-killing manifold (16). The two parts are arranged on the drilling floor, and the two parts are arranged according to the weight distribution of the equipment on the drilling floor to evenly distribute the weight of each equipment on the drilling floor.

9. The lightweight fully hydraulically controlled offshore workover rig according to claim 1, characterized in that: The workover rig also includes a pipe grabber (10) and a power catwalk (9), and a track or roller is arranged below the power catwalk (9), so that the power catwalk (9) can move in translation along with the workover rig as a whole.

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