CN112502658A - Installation method of oil gas production wet type protection structure located under seabed mud surface - Google Patents
Installation method of oil gas production wet type protection structure located under seabed mud surface Download PDFInfo
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- CN112502658A CN112502658A CN202011117017.7A CN202011117017A CN112502658A CN 112502658 A CN112502658 A CN 112502658A CN 202011117017 A CN202011117017 A CN 202011117017A CN 112502658 A CN112502658 A CN 112502658A
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- steel cylinder
- caisson
- mud surface
- cylinder
- gas production
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- 238000009434 installation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 241000191291 Abies alba Species 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000004575 stone Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/037—Protective housings therefor
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses an installation method of a wet protection structure for oil and gas production under a seabed mud surface. The installation method comprises the following steps: excavating a foundation pit at a construction position according to the size of the wet type protective structure for oil gas production; placing the steel cylinder in the foundation pit and vibrating and sinking the steel cylinder to be below the mud surface; removing the upper cylinder of the steel cylinder to expose the mud surface; excavating in the steel cylinder to a preset depth below the mud surface; installing a riser, a wellhead head and a protective cover; paving a broken stone cushion layer at the bottom of the steel cylinder; mounting a prefabricated caisson in the steel cylinder; installing a Christmas tree to complete the connection of the pipe cable in the caisson; completing the connection of the caisson and an external pipe cable; dismantling the middle cylinder of the steel cylinder; and backfilling the foundation pit and burying the caisson below the mud surface. The installation method is simple to operate, saves the installation cost, and is beneficial to improving the integrity of the wet protection structure for oil gas production, thereby providing a new method for installing the wet protection structure for oil gas production under the seabed mud surface.
Description
Technical Field
The invention relates to an installation method of a wet protection structure for oil and gas production under the mud surface of a seabed, and belongs to the technical field of ocean engineering.
Background
In ocean engineering, subsea production systems have a wide range of applications due to their significant economic and technical advantages. The underwater production system is generally positioned above a mud surface, and an underwater production facility is protected by adopting a firm enough foundation and a protection structure through which a fishing net can slide, so that the harmony and the coexistence of fishery and oil gas production are realized. The installation method of the protective structure above the mud surface is that the anti-sinking plate is installed firstly and then the upper protective structure is installed. However, in the navigation area, the safety of navigation and underwater production facilities is considered, an underwater production system needs to be moved below the mud surface of the seabed, and the installation mode of the existing underwater protection structure cannot meet the installation requirement.
Disclosure of Invention
The invention aims to provide an installation method of a wet protection structure for oil and gas production under the mud surface of a seabed, which has the characteristic of high installation efficiency.
The invention provides an installation method of a wet protection structure for oil and gas production under the surface of seabed mud, which comprises the following steps:
(1) excavating a foundation pit at a construction position according to the size of the wet type protective structure for oil gas production;
(2) placing a steel cylinder in the foundation pit and vibrating and sinking the steel cylinder below a mud surface, wherein the steel cylinder comprises a lower cylinder, a middle cylinder and an upper cylinder, the upper end of the lower cylinder is positioned in the foundation pit, and the height of the lower cylinder is not less than that of the caisson;
(3) dismantling the upper steel cylinder of the steel cylinder to expose the mud surface of the steel cylinder;
(4) excavating in the steel cylinder to a preset depth below a mud surface;
(5) installing a riser, a wellhead head and a protective cover;
(6) paving a gravel cushion layer at the bottom of the steel cylinder;
(7) installing the prefabricated caisson in the steel cylinder;
(8) installing a Christmas tree to complete the connection of the pipe cable in the caisson;
(8) completing the connection of the caisson and an external pipe cable;
(9) removing the middle cylinder of the steel cylinder;
(10) and backfilling the foundation pit and burying the caisson below the mud surface.
In the above installation method, in the step (2), the steel cylinder is vibrated and sunk to a depth below the mud surface which is not less than the height of the caisson.
In the above installation method, in the step (4), the predetermined depth is not less than the height of the caisson.
In the mounting method, in the step (6), the height of the gravel cushion layer is 0.8-1.2 m.
In the above installation method, in the step (7), the steel cylinder and the caisson are connected by grouting.
The installation method of the invention has the following beneficial effects:
the installation method provided by the invention is simple to operate, saves the installation cost, and is beneficial to improving the integrity of the oil-gas production wet-type protection structure, so that a new method is provided for installation of the oil-gas production wet-type protection structure under the seabed mud surface in the field of installation of the oil-gas production protection structure.
Drawings
Fig. 1 is a schematic diagram of excavation of a foundation pit and vibration sinking of a steel cylinder.
Fig. 2 is a schematic drawing of the upper steel cylinder removed.
Fig. 3 is a schematic view of the steel cylinder being excavated to a predetermined depth below the mud surface.
Figure 4 is a schematic view of the installation of the riser, wellhead head and shield.
FIG. 5 is a schematic view of a gravel cushion layer laid on the bottom of the foundation pit.
Fig. 6 is a schematic diagram of the connection of the precast caisson, the poured concrete and the steel cylinder.
Fig. 7 is a schematic diagram of the installation of a christmas tree to complete the umbilical connection inside the caisson.
Fig. 8 is a schematic view of the completion of the caisson with external umbilical connection.
Fig. 9 is a schematic drawing with the steel cylinder removed in the middle.
Fig. 10 is a schematic view of backfilling soil burying the caisson below the mud surface.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The installation process of the invention is explained with reference to the accompanying drawings:
(1) excavating a foundation pit at a construction position by using a dredger, wherein the size of the foundation pit is determined by the size of a protective structure, as shown in figure 1;
(2) vibrating and sinking the steel cylinder to a sufficient depth below the mud surface, as shown in fig. 2;
(3) dismantling the upper steel cylinder to expose the mud surface, as shown in fig. 3;
(4) excavating into the steel cylinder to a predetermined depth below the mud surface, as shown in fig. 4;
(5) paving a broken stone cushion layer in the steel cylinder, reserving a drilling and completion position, and enabling the thickness to be 0.8-1.2 m as shown in figure 5;
(6) installing a prefabricated caisson, as shown in fig. 6;
(7) grouting to connect the steel cylinder and caisson, as shown in fig. 7;
(8) installing a sea pipe submarine cable, performing drilling and completion operation, and installing a Christmas tree, as shown in FIG. 8;
(9) completing the pipe-line connection inside the caisson, as shown in fig. 9;
(10) the middle steel cylinder was removed by closing the caisson lid and backfilling as shown in fig. 10.
The steel cylinder adopted by the method comprises three sections: the upper cylinder, the middle cylinder and the lower cylinder are connected through flanges, so that the upper cylinder, the middle cylinder and the lower cylinder are convenient to disassemble, and the height of the lower cylinder is not less than that of the caisson.
Claims (5)
1. An installation method of a wet protection structure for oil and gas production located below a seabed mud surface comprises the following steps:
(1) excavating a foundation pit at a construction position according to the size of the wet type protective structure for oil gas production;
(2) placing a steel cylinder in the foundation pit and vibrating and sinking the steel cylinder below a mud surface, wherein the steel cylinder comprises a lower cylinder, a middle cylinder and an upper cylinder, the upper end of the lower cylinder is positioned in the foundation pit, and the height of the lower cylinder is not less than that of the caisson;
(3) removing the upper cylinder of the steel cylinder to expose the mud surface of the steel cylinder;
(4) excavating in the steel cylinder to a preset depth below a mud surface;
(5) installing a riser, a wellhead head and a protective cover;
(6) paving a gravel cushion layer at the bottom of the steel cylinder;
(7) installing the prefabricated caisson in the steel cylinder;
(8) installing a Christmas tree to complete the connection of the pipe cable in the caisson;
(8) completing the connection of the caisson and an external pipe cable;
(9) removing the middle cylinder of the steel cylinder;
(10) and backfilling the foundation pit and burying the caisson below the mud surface.
2. The mounting method according to claim 1, wherein: and (2) vibrating and sinking the steel cylinder to a depth below a mud surface which is not less than the height of the caisson.
3. The mounting method according to claim 1 or 2, wherein: in the step (4), the predetermined depth is not less than the height of the caisson.
4. The mounting method according to any one of claims 1 to 3, wherein: in the step (6), the height of the gravel cushion layer is 0.8-1.2 m.
5. The mounting method according to any one of claims 1 to 4, wherein: and (7) connecting the steel cylinder and the caisson by grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011117017.7A CN112502658A (en) | 2020-10-19 | 2020-10-19 | Installation method of oil gas production wet type protection structure located under seabed mud surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011117017.7A CN112502658A (en) | 2020-10-19 | 2020-10-19 | Installation method of oil gas production wet type protection structure located under seabed mud surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112502658A true CN112502658A (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011117017.7A Pending CN112502658A (en) | 2020-10-19 | 2020-10-19 | Installation method of oil gas production wet type protection structure located under seabed mud surface |
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|---|---|
| CN (1) | CN112502658A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404050A (en) * | 2021-05-27 | 2021-09-17 | 中海石油(中国)有限公司 | Installation method of integrated steel cylinder underwater protection system |
| CN113898324A (en) * | 2021-09-30 | 2022-01-07 | 中海石油(中国)有限公司 | Protection system and method for underwater production under seabed mud surface |
| CN115059102A (en) * | 2022-06-30 | 2022-09-16 | 中海石油(中国)有限公司 | Installation method of wet steel cofferdam protection structure for oil-gas production under seabed mud surface |
| CN115162390A (en) * | 2022-06-30 | 2022-10-11 | 中海石油(中国)有限公司 | Oil-gas production wet caisson butt joint installation method under seabed mud surface |
Citations (8)
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|---|---|---|---|---|
| US4558744A (en) * | 1982-09-14 | 1985-12-17 | Canocean Resources Ltd. | Subsea caisson and method of installing same |
| CN103397871A (en) * | 2013-08-14 | 2013-11-20 | 大连理工大学 | Dry-type Christmas tree based ultra-deepwater oil and gas development system and mounting method thereof |
| CN105003232A (en) * | 2015-07-23 | 2015-10-28 | 大连理工大学 | Ultra-deep marine oil and gas dry type production system, installing method of ultra-deep marine oil and gas dry type production system and evacuating method of ultra-deep marine oil and gas dry type production system |
| CN106703761A (en) * | 2016-12-02 | 2017-05-24 | 大连理工大学 | Whole-dry type system for producing oil and gas in water and working method of whole-dry type system for producing oil and gas in water |
| CN107034906A (en) * | 2017-04-28 | 2017-08-11 | 中国建筑第六工程局有限公司 | Marine shallow slotting formula steel cylinder foundation trench excavates altering fill method |
| CN108661608A (en) * | 2018-06-07 | 2018-10-16 | 中海油能源发展股份有限公司 | A kind of underwater dry-type extracting device of oil suitable for shallow water oil-gas field development |
| CN109024525A (en) * | 2018-08-09 | 2018-12-18 | 海南大学 | A kind of artificial island structure and its construction method considering underground space development |
| CN110439495A (en) * | 2019-08-21 | 2019-11-12 | 中海油能源发展股份有限公司 | A kind of subsea production system protective device |
-
2020
- 2020-10-19 CN CN202011117017.7A patent/CN112502658A/en active Pending
Patent Citations (8)
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|---|---|---|---|---|
| US4558744A (en) * | 1982-09-14 | 1985-12-17 | Canocean Resources Ltd. | Subsea caisson and method of installing same |
| CN103397871A (en) * | 2013-08-14 | 2013-11-20 | 大连理工大学 | Dry-type Christmas tree based ultra-deepwater oil and gas development system and mounting method thereof |
| CN105003232A (en) * | 2015-07-23 | 2015-10-28 | 大连理工大学 | Ultra-deep marine oil and gas dry type production system, installing method of ultra-deep marine oil and gas dry type production system and evacuating method of ultra-deep marine oil and gas dry type production system |
| CN106703761A (en) * | 2016-12-02 | 2017-05-24 | 大连理工大学 | Whole-dry type system for producing oil and gas in water and working method of whole-dry type system for producing oil and gas in water |
| CN107034906A (en) * | 2017-04-28 | 2017-08-11 | 中国建筑第六工程局有限公司 | Marine shallow slotting formula steel cylinder foundation trench excavates altering fill method |
| CN108661608A (en) * | 2018-06-07 | 2018-10-16 | 中海油能源发展股份有限公司 | A kind of underwater dry-type extracting device of oil suitable for shallow water oil-gas field development |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404050A (en) * | 2021-05-27 | 2021-09-17 | 中海石油(中国)有限公司 | Installation method of integrated steel cylinder underwater protection system |
| CN113898324A (en) * | 2021-09-30 | 2022-01-07 | 中海石油(中国)有限公司 | Protection system and method for underwater production under seabed mud surface |
| CN113898324B (en) * | 2021-09-30 | 2023-11-14 | 中海石油(中国)有限公司 | Protection system and method for underwater production below seabed mud surface |
| CN115059102A (en) * | 2022-06-30 | 2022-09-16 | 中海石油(中国)有限公司 | Installation method of wet steel cofferdam protection structure for oil-gas production under seabed mud surface |
| CN115162390A (en) * | 2022-06-30 | 2022-10-11 | 中海石油(中国)有限公司 | Oil-gas production wet caisson butt joint installation method under seabed mud surface |
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Application publication date: 20210316 |
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