A modular installation method for a wellhead deck on an offshore platform

Abstract

The application discloses a kind of offshore platform wellhead area deck modular installation method, comprising the following steps: lower wellhead area deck is fixedly connected to Christmas tree drilling wellhead bottom end;Upper wellhead area deck is fixedly connected to the top end of module wellhead area;Before the fixed installation of module and Christmas tree, the fixed connection of lower wellhead area deck and Christmas tree is removed, and lower wellhead area deck is lowered to the top horizontal layer position of guide pipe support by lifting device;After the fixed installation of module and Christmas tree is completed, lower wellhead area deck is integrally lifted to lower wellhead area deck design position by lifting device, and welding is fixed;After the fixed installation of module and Christmas tree is completed, upper wellhead area deck is integrally lowered to upper wellhead area deck design position by lifting device, and welding is fixed.The application improves the offshore construction efficiency of structure installation by the installation scheme of integrally lowering and integrally lifting wellhead area deck, effectively saves floating crane cost and material cost.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore construction of marine engineering structures, and in particular to a modular installation method for a deck in a wellhead area of ​​an offshore platform. Background Art

[0002] During the installation of marine engineering structures, the daily rate of offshore construction fleet resources is very expensive, and the speed of offshore construction efficiency seriously affects the cost of the entire project. Therefore, how to improve the platform installation efficiency has become the key to improving the economic efficiency of engineering development. In oilfield development projects, in order to further shorten the overall construction period of the platform, pre-drilling is generally carried out between the installation of the jacket and the installation of the module. Therefore, the drilling platform below the oil tree is responsible for operating the construction platform before the module is installed. However, for the safety of the module installation, it is necessary to ensure that there is sufficient safety clearance between the module and the wellhead, which means that the temporary drilling platform needs to be partially removed and re-assembled after the module installation is completed. Since the oil tree is high and generally passes through two decks, the deck above the oil tree also needs to be spliced ​​on site after the module installation is completed. The traditional construction method of these two decks affects the construction efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a modular installation method for the wellhead area deck of an offshore platform. By adopting the installation scheme of lowering and lifting the wellhead area deck as a whole, the offshore construction efficiency of the structure installation is improved, and the floating crane cost and material cost are effectively saved.

[0004] To achieve the purpose of the present invention, the present invention provides a modular installation method for a wellhead area deck of an offshore platform, comprising the following steps:

[0005] S1. Fix the lower wellhead deck to the bottom of the Christmas tree drilling wellhead;

[0006] S2. Fix the upper wellhead area deck to the top of the module wellhead area;

[0007] S3. Before the assembly module and the Christmas tree are fixedly installed, the fixed connection between the lower wellhead deck and the Christmas tree is released, and the lower wellhead deck is lowered to the top horizontal layer of the jacket using a lifting device;

[0008] S4. After the assembly block and the Christmas tree are fixedly installed, the lower wellhead deck is hoisted as a whole to the designed position of the lower wellhead deck by the hoisting device and fixed by welding.

[0009] S5. After the assembly block and the Christmas tree are fixedly installed, the upper wellhead deck is lowered as a whole to the designed position of the upper wellhead deck by the lifting device and fixed by welding.

[0010] As a preferred technical solution of the present invention, pre-drilling is performed after the jacket is installed and before the module is installed, and the lower wellhead deck serves as a temporary drilling platform.

[0011] As a preferred technical solution of the present invention, during the design and installation phase of the jacket, the temporary drilling platform is installed as a permanent structure for design.

[0012] As a preferred technical solution of the present invention, the lower wellhead area deck is placed at a horizontal layer on the top of the jacket and is lower than the designed position of the lower wellhead area deck.

[0013] As a preferred technical solution of the present invention, the upper wellhead area deck is fixedly connected to the block at a position higher than the designed position of the upper wellhead area deck.

[0014] Compared with the prior art, the present invention provides a modular installation method for the wellhead area deck of an offshore platform, which has the following beneficial effects:

[0015] The present invention solves the problem that the wellhead deck needs to be disassembled and spliced ​​during offshore installation. The overall installation can be carried out by lifting the lower wellhead deck as a whole and lowering the upper wellhead deck as a whole. This optimizes the construction plan, reduces the offshore construction period, improves the overall project efficiency, and saves project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the entire lowering of the lower wellhead area deck of the present invention;

[0017] Figure 2 This is a schematic diagram of the overall lifting and installation of the lower wellhead area deck of the present invention;

[0018] Figure 3 This is a schematic diagram of the overall suspension of the upper wellhead area deck of the present invention;

[0019] Figure 4 It is a schematic diagram of the overall lowering installation of the upper wellhead area deck of the present invention.

[0020] 1 is the lower wellhead deck, 2 is the module, 3 is the upper wellhead deck, 4 is the Christmas tree, 5 is the lifting device, 6 is the jacket, 7 is the design position of the lower wellhead deck, and 8 is the design position of the upper wellhead deck. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 4 The embodiment of the present invention provides a modular installation method for a wellhead deck of an offshore platform, comprising the following steps:

[0023] S1. Fix the lower wellhead deck 1 to the bottom of the drilling wellhead of the Christmas tree 4;

[0024] S2, fixing the upper wellhead area deck 3 to the top of the wellhead area of ​​block 2;

[0025] S3. Before the assembly block 2 and the Christmas tree 4 are fixedly installed, the fixed connection between the lower wellhead deck 1 and the Christmas tree 4 is released, and the lower wellhead deck 1 is lowered to the top horizontal layer of the jacket 6 by the lifting device 5;

[0026] S4. After the assembly block 2 and the Christmas tree 4 are fixedly installed, the lower wellhead deck 1 is hoisted as a whole to the lower wellhead deck design position 7 by the hoisting device 5 and fixed by welding.

[0027] S5. After the assembly block 2 and the Christmas tree 4 are fixedly installed, the upper wellhead deck 3 is lowered as a whole to the upper wellhead deck design position 8 by the lifting device 5 and fixed by welding.

[0028] In one embodiment of the present invention, pre-drilling is performed after the jacket 6 is installed and before the module 2 is installed, and the lower wellhead deck 1 serves as a temporary drilling platform.

[0029] In one embodiment of the present invention, the jacket 6 is designed to be installed as a permanent structure during the design and installation phase.

[0030] In one embodiment of the present invention, the lower wellhead deck 1 is placed at a horizontal layer on the top of the jacket 6 and is lower than the designed position 7 of the lower wellhead deck.

[0031] In one embodiment of the present invention, the upper wellhead deck 3 is fixedly connected to the module 2 at a position higher than the designed position 8 of the upper wellhead deck.

[0032] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A modular installation method for a wellhead deck of an offshore platform, characterized in that: The following steps are involved: S1, fixing the lower wellhead deck (1) to the bottom end of the drilling wellhead of the Christmas tree (4); S2, fixing the upper wellhead area deck (3) to the top of the wellhead area of ​​the module (2); S3, before the assembly block (2) and the Christmas tree (4) are fixedly installed, the fixed connection between the lower wellhead deck (1) and the Christmas tree (4) is released, and the lower wellhead deck (1) is lowered to the top horizontal layer of the jacket (6) by a lifting device (5); S4. After the assembly block (2) and the Christmas tree (4) are fixedly installed, the lower wellhead deck (1) is hoisted as a whole to the designed position (7) of the lower wellhead deck by the hoisting device (5), and then fixed by welding. S5. After the assembly block (2) and the Christmas tree (4) are fixed and installed, the upper wellhead deck (3) is lowered as a whole to the upper wellhead deck design position (8) through the lifting device (5) and fixed by welding.

2. The modular installation method for a wellhead deck of an offshore platform according to claim 1, characterized in that: In step S3, pre-drilling is performed after the jacket (6) is installed and before the assembly (2) is installed, and the lower wellhead area deck (1) serves as a temporary drilling platform.

3. The modular installation method for a wellhead deck of an offshore platform according to claim 2, characterized in that: During the design and installation phase of the jacket (6), the temporary drilling platform is installed on a permanent structure for design.

4. The modular installation method for a wellhead deck of an offshore platform according to claim 1, characterized in that: The lower wellhead area deck (1) is placed at a horizontal layer on the top of the jacket (6) and is lower than the designed position (7) of the lower wellhead area deck.

5. The modular installation method for a wellhead deck of an offshore platform according to claim 1, characterized in that: The upper wellhead area deck (3) is fixedly connected to the assembly block (2) at a position higher than the designed position (8) of the upper wellhead area deck.

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