A power device capable of lowering a pipe string in the moonpool area

Abstract

The present invention discloses a power device capable of lowering a pipe string in the moonpool area, which comprises a base, a lifting mechanism and a clamping mechanism. The base is detachably arranged on the blowout preventer trolley, and a lower pipe orifice is arranged on the base, and the lower pipe orifice is in a V shape. A lifting mechanism is arranged on the base, and a clamping mechanism is arranged on the lifting mechanism. The lifting mechanism can drive the clamping mechanism to move up and down, and the clamping mechanism corresponds to the lower pipe orifice. The power device for the lower pipeline of the present invention can parallelly install and connect a drill pipe string, a casing string and other pipe strings under a single marine derrick / wellhead drilling platform. The hydraulic gripper is driven by the lifting mechanism to move up and down, and the hydraulic gripper can realize the clamping of drill tools of different specifications by replacing the slips, so that the equipment has the ability to parallelly lower pipes when the top drive or the wellhead is occupied; when in use, the equipment involved does not occupy the wellhead, and does not use the equipment such as the top drive for wellhead drill tools, and can operate in parallel with the wellhead equipment to realize the installation and connection of the pipe string and improve the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore drilling equipment, and particularly relates to a power device capable of lowering a pipe string in a moonpool area. Background Art

[0002] Generally, there are catwalk machines, pipe racks, iron roughnecks, mouse holes, power slips, etc. on a drilling platform. When traditional single-jack / wellhead offshore jack-up and mobile drilling platforms operate, the cooperation of a top drive, a pipe racking device, and power slips is adopted to lower downhole drilling tools, casing pipes, production pipelines and other underwater drilling and completion tools. Since the top drive or the wellhead is occupied, it is impossible to simultaneously complete the lowering operation of other parallel auxiliary pipelines. And the cost of offshore operations is relatively high. The traditional single-process sequential operation takes a long time and has a high cost. Therefore, there is an urgent need for a multi-process parallel operation device to reduce costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a power device capable of lowering a pipe string in a moonpool area, so as to solve the problems existing in the above-mentioned prior art, and enable the drilling platform to still have the ability to lower pipes in parallel when the top drive or the wellhead is occupied.

[0004] To achieve the above purpose, the present invention provides the following solution:

[0005] The present invention provides a power device capable of lowering a pipe string in a moonpool area, which includes a base, a lifting mechanism and a clamping mechanism. The base is detachably arranged on a blowout preventer trolley. A lower pipe opening is arranged on the base. The lifting mechanism is arranged on the base. The clamping mechanism is arranged on the lifting mechanism. The lifting mechanism can drive the clamping mechanism to move up and down. The clamping mechanism is used for clamping the pipe string. The clamping mechanism corresponds to the lower pipe opening to make the pipe string in a vertical state.

[0006] Preferably, the lifting mechanism includes lifting cylinders, a guide frame and a crown block. There are two lifting cylinders and the crown block is connected to the top rods. A pair of guide frames are correspondingly arranged on the lifting cylinders. Vertical guide rails are respectively arranged on the guide frames. The clamping mechanism is provided with sliders matching the vertical guide rails. The clamping mechanism is fixedly connected to the base through a wire rope or a chain bypassing the crown block.

[0007] Preferably, two groups of fixed pulleys are symmetrically arranged on both sides of the crown block. There are two wire ropes or chains and they are correspondingly wound around the fixed pulleys.

[0008] Preferably, the clamping mechanism includes a hydraulic gripper and slips. The side wall of the hydraulic gripper is provided with a slider as a guide wheel. The vertical guide rail on the side wall of the guide frame is a guide groove. The guide wheel is embedded in the guide groove. The slips are detachably arranged on the hydraulic gripper.

[0009] Preferably, the slips are provided with several models with different clamping sizes.

[0010] Preferably, the lower pipe opening is V-shaped.

[0011] The present invention has achieved the following technical effects compared with the prior art:

[0012] The power device of the lower pipeline of the present invention can install drill pipe strings, casing strings and other pipe strings in parallel under a marine single derrick / wellhead drilling platform. The lifting mechanism is used to drive the hydraulic gripper to move up and down. The hydraulic gripper can clamp drill pipes of different specifications by replacing the slips, enabling the equipment to have the ability to install pipes in parallel when the top drive or the wellhead is occupied; when in use, the equipment involved does not occupy the wellhead, and does not use equipment such as the top drive used for wellhead drill pipes, and can operate in parallel with the wellhead equipment to achieve the installation of pipe strings and improve the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 Structural schematic of the power device for installing pipe strings in the moonpool area of the present invention Figure 1 ;

[0015] Figure 2 Structural schematic of the power device for installing pipe strings in the moonpool area of the present invention Figure 2 ;

[0016] Figure 3 Structural schematic of the power device for installing pipe strings in the moonpool area of the present invention Figure 3 ;

[0017] Among them: 1 - blowout preventer trolley, 2 - base, 3 - lower pipe opening, 4 - lifting oil cylinder, 5 - guide frame, 6 - vertical guide rail, 7 - crown block, 8 - fixed pulley, 9 - wire rope, 10 - hydraulic gripper, 11 - slips, 12 - guide wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0019] The object of the present invention is to provide a power device capable of lowering a pipe string in the moonpool area, so as to solve the problems existing in the prior art and enable the drilling platform to still have the ability to lower pipes in parallel when the top drive or the wellhead is occupied.

[0020] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] As Figures 1 to 3 shown: This embodiment provides a power device capable of lowering a pipe string in the moonpool area, including a base 2, a lifting mechanism and a clamping mechanism. The base 2 is detachably arranged (fixed by bolts) on the blowout preventer trolley 1. An open lower pipe opening 3 is arranged on the base 2. The lower pipe opening 3 is V-shaped and has a round opening at the top. The slips 11 of the clamping mechanism are on the same vertical line as the round opening of the lower pipe opening 3 to ensure the verticality of the pipe string. A lifting mechanism is arranged on the base 2, and a clamping mechanism is arranged on the lifting mechanism. The lifting mechanism can drive the clamping mechanism to move up and down. The clamping mechanism is used to clamp the pipe string. The clamping mechanism corresponds to the lower pipe opening 3 to keep the pipe string in a vertical state. Using the blowout preventer trolley 1 as an installation platform and the drilling rig hydraulic station as a power source, and installing it with a blowout preventer crane or a folding boom crane is convenient for disassembly and does not occupy the moonpool space. The equipment in this embodiment has functions such as clamping, lifting, lowering, suspending, and translating the drill string, and can be used as a wellhead power device for off-line operation of the drill string. It can be directly controlled by a hydraulic control console or a wired control console.

[0022] The lifting mechanism includes lifting cylinders 4, guide frames 5 and a crown block 7. There are two lifting cylinders 4 and the crown block 7 is connected to the top rod. A pair of guide frames 5 are correspondingly arranged on the lifting cylinders 4. Vertical guide rails 6 are respectively arranged on the guide frames 5. The clamping mechanism is provided with sliders matching the vertical guide rails 6. The clamping mechanism is fixedly connected to the base through a wire rope 9 or a chain passing around the crown block 7. Among them, two groups of fixed pulleys 8 are symmetrically arranged on both sides of the crown block 7. The wire rope 9 or the chain is two and is correspondingly wound around the fixed pulleys 8, which is beneficial to the stability of the lifting process.

[0023] The clamping mechanism includes a hydraulic clamp 10 and a slip 11. A slider is provided on the side wall of the hydraulic clamp 10 as a guide wheel 12. The vertical guide rail on the side wall of the guide frame 5 is a guide groove. The guide wheel 12 is embedded in the guide groove so that the guide wheel 12 will not derail. The slip 11 is detachably provided (bolted) on the hydraulic clamp 10, so as to facilitate the replacement of the corresponding model according to the diameter of the pipe string. The slip 11 is provided with several models of different clamping sizes to achieve the clamping of drilling tools and pipe strings of different specifications. A U-shaped opening is provided in the middle of the hydraulic clamp 10 for passing the pipe string. The hydraulic clamp 10 and slip 11 in this embodiment are conventional clamps and slip mechanisms in the art. The clamp is driven by a hydraulic cylinder and can be directly controlled by a hydraulic operating table or a wired electric control operating table. The hydraulic source can come from the loop hydraulic pump station of the drilling system or the equipment itself.

[0024] The specific operation process of this embodiment is as follows:

[0025] After the drill tool is sent down from the drilling table and inserted into the hydraulic clamp 10 below, the hydraulic clamp 10 below moves up to the end position to clamp the drill tool, and the hydraulic clamp above the drilling table is released, and the lifting cylinder 4 moves downward, driving the hydraulic clamp 10 below to move downward on the vertical guide rail 6 until the upper part of the drill tool meets the clamping requirements of the hydraulic clamp above, then stops and hovers, and waits for the upper drill tool to be connected, and the hydraulic clamp below is released and moves upward to carry out the next drill tool lowering cycle.

[0026] The device of this embodiment does not require any special equipment and can be installed on any traditional single derrick / wellhead offshore jack-up and mobile drilling platform. It only needs to be installed on the blowout preventer transport trolley and driven by the hydraulic power of the drilling rig to achieve parallel operation. When the wellhead drilling is completed and the drill pipe is raised, the casing string can be directly transported to the wellhead through the blowout preventer trolley 1, and the top drive is directly connected to the pipe string to start the pipe string lowering operation. During the casing string lowering process, the device of this embodiment can be used to continue to connect the remaining casing strings, thereby minimizing the working time and improving the working efficiency.

[0027] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A power device capable of lowering a pipe string in the moonpool area, characterized in that: It includes a base, a lifting mechanism and a clamping mechanism. The base is detachably arranged on the blowout preventer trolley. A lower pipe orifice is arranged on the base. The lifting mechanism is arranged on the base, and the clamping mechanism is arranged on the lifting mechanism. The lifting mechanism can drive the clamping mechanism to move up and down. The clamping mechanism is used for clamping the pipe string. The clamping mechanism corresponds to the lower pipe orifice to keep the pipe string in a vertical state. The lower pipe orifice is V-shaped. The lifting mechanism includes a lifting oil cylinder, a guide frame and a block and tackle. A pair of the guide frames are correspondingly arranged on the lifting oil cylinder. Vertical guide rails are respectively arranged on the guide frames. The clamping mechanism is provided with sliders matching the vertical guide rails. The clamping mechanism includes a hydraulic gripper and slips. The side wall of the hydraulic gripper is provided with sliders as guide wheels, and the vertical guide rails on the side wall of the guide frame are guide grooves. The guide wheels are embedded in the guide grooves. The slips are detachably arranged on the hydraulic gripper.

2. The power device capable of lowering the pipe string in the moonpool area according to claim 1, wherein: There are two lifting oil cylinders, and the top rod is connected with the block and tackle. The clamping mechanism is fixedly connected with the base through a wire rope or a chain bypassing the block and tackle.

3. The power device capable of lowering the pipe string in the moonpool area according to claim 2, characterized in that: Two groups of fixed pulleys are symmetrically arranged on both sides of the block and tackle. There are two wire ropes or chains, which are correspondingly wound on the fixed pulleys.

4. The power device capable of lowering the pipe string under the moonpool area according to claim 1, wherein: The slips are provided with several models with different clamping sizes.

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