CN113236141B - Surface layer conduit bearing capacity reinforcing device and operation method thereof - Google Patents
Surface layer conduit bearing capacity reinforcing device and operation method thereof Download PDFInfo
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- CN113236141B CN113236141B CN202110637308.7A CN202110637308A CN113236141B CN 113236141 B CN113236141 B CN 113236141B CN 202110637308 A CN202110637308 A CN 202110637308A CN 113236141 B CN113236141 B CN 113236141B
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- fixing plate
- surface layer
- bearing capacity
- reinforcing device
- truss
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/02—Supports for the drilling machine, e.g. derricks or masts specially adapted for underwater drilling
Abstract
The invention relates to a surface layer conduit bearing capacity reinforcing device and an operation method thereof, wherein the surface layer conduit bearing capacity reinforcing device comprises a surface layer conduit, an upper fixing plate, a lower fixing plate and a truss supporting structure; the upper fixing plate and the lower fixing plate are fixed outside the surface layer catheter at intervals in parallel; the truss support structure includes: the two groups of the four-corner trusses are respectively and fixedly connected to two opposite sides of the upper fixed top plate and the lower fixed top plate; and the triangular trusses are respectively and fixedly connected to one sides of the four corner trusses far away from the upper fixing plate and the lower fixing plate. The invention can effectively overcome the problems of poor timeliness, high economic cost and large risk factor existing in the existing mode, and realizes the purposes of simple structure, convenient operation and high operation efficiency.
Description
Technical Field
The invention relates to a surface guide pipe bearing capacity reinforcing device for an unstable shallow stratum containing hydrate and an operation method thereof, belonging to the field of drilling equipment in offshore oil engineering.
Background
The natural gas hydrate is a solid compound which is formed by natural gas and water under the conditions of low temperature and high pressure and mainly contains methane, about 10 percent of reserves are distributed in a shallow stratum within dozens of meters to 300m below the sea bottom, and more than 90 percent of reserves are distributed in a deep sea area with the water depth of more than 800 meters. In the development process of the ocean deepwater oil and gas field, when deepwater surface jet drilling operation is implemented, a drill rod is connected with a drill bit to form a jet pipe column, and high-speed fluid is jetted from a nozzle of the drill bit to impact and disturb surrounding strata so as to form a well hole, so that a surface conduit is lowered into the well hole. However, when the injection lower surface layer conduit operation is performed in the formation containing the natural gas hydrate, the natural gas hydrate in the formation in the injection range and the area nearby the injection range is decomposed, and a large amount of methane gas and water are released continuously, so that the pore pressure of the decomposition area is increased rapidly, the effective stress of the formation is reduced greatly, the strength and the stability of the formation are reduced greatly, and the lateral friction resistance between the surface layer conduit and the formation is reduced. The surface layer conduit and the underwater well mouth thereon have the functions of bearing well mouth load and suspending each layer of casing, the bearing capacity of the surface layer conduit and the underwater well mouth is mainly provided by the stratum, and when the well mouth load exceeds the bearing capacity which can be provided by the stratum after the hydrate is decomposed, serious operation accidents such as well mouth sinking, methane dissipation, seabed sinking and the like can be caused, so that huge economic loss and marine environmental pollution are caused.
At present, the existing solution is to improve the bearing capacity of the stratum by increasing the running depth of the guide pipe and prolonging the waiting time of the guide pipe after running, but the method has poor timeliness, higher economic cost and large operation risk and difficulty, and leaves huge potential safety hazards for subsequent drilling operation and deep water oil and gas field production. No effective solution to this problem exists.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a surface conduit bearing capacity enhancing device for hydrate-containing unstable shallow formations, which can effectively overcome the problems of poor timeliness, high economic cost and large risk factor existing in the existing manner, and achieve the purposes of simple structure, convenient operation and high efficiency of operation; another object of the present invention is to provide a method for operating the device for enhancing the bearing capacity of the surface layer catheter.
In order to achieve the purpose, the invention adopts the following technical scheme: a surface layer conduit bearing capacity reinforcing device comprises a surface layer conduit, an upper fixing plate, a lower fixing plate and a truss supporting structure; the upper fixing plate and the lower fixing plate are fixed outside the surface layer catheter at intervals in parallel; the truss support structure includes: the two groups of the four-corner trusses are respectively and fixedly connected to two opposite sides of the upper fixed top plate and the lower fixed top plate; and the triangular trusses are respectively and fixedly connected to one sides of the four corner trusses far away from the upper fixing plate and the lower fixing plate.
The surface layer conduit bearing capacity reinforcing device is characterized in that preferably, the surface layer conduit penetrates through the middle parts of the upper fixing plate and the lower fixing plate, and the surface layer conduit and the upper fixing plate and the lower fixing plate form an angle of 90 degrees and are connected through welding.
The surface layer conduit bearing capacity reinforcing device is preferably characterized in that the four-corner truss is a square four-corner truss, and the upper plane and the lower plane of the square four-corner truss are respectively flush with the upper fixing plate and the lower fixing plate.
The surface layer conduit bearing capacity reinforcing device is characterized in that the triangular truss is an isosceles right-angle triangular truss, a right-angle surface of the isosceles right-angle triangular truss is fixedly connected with the side surface of the square four-angle truss far away from the upper fixing plate and the lower fixing plate, and the other right-angle surface of the isosceles right-angle triangular truss is flush with the lower fixing plate.
The surface layer conduit bearing capacity reinforcing device is preferably characterized in that the thickness of the lower fixing plate is larger than that of the upper fixing plate.
An operation method of the surface layer conduit bearing capacity reinforcing device is applied to jet drilling operation of hydrate-containing unstable shallow strata, and specifically comprises the following steps:
s1, putting a surface layer conduit bearing capacity reinforcing device downwards from a carrier deck into water, wherein the surface layer conduit bearing capacity reinforcing device naturally sags under the action of gravity and forms an angle with the horizontal ground;
s2, the surface layer conduit bearing capacity reinforcing device is lowered to the bottom, the mud surface is detected initially and is spread completely, and the truss supporting structure can reduce the frictional resistance of the surface layer conduit bearing capacity reinforcing device in water and ensure that subsequent operation is carried out smoothly in the process of lowering until the mud surface is spread completely;
s3, after the surface layer conduit bearing capacity reinforcing device completely enters mud, the bottom surfaces of the lower fixing plate and the truss supporting structure are contacted with the sea bottom surface and slightly enter mud, so that the contact area of the surface layer conduit bearing capacity reinforcing device and a soil body is increased, and the bearing capacity of a stratum to the surface layer conduit is further improved;
s4, when the operation of the drilling well is finished, after the cutting operation of the guide pipe is finished, the surface guide pipe bearing capacity reinforcing device can be lifted to the water surface only by lifting the surface guide pipe bearing capacity reinforcing device through the drill rod, and therefore the cyclic utilization of the surface guide pipe bearing capacity reinforcing device is achieved.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. when the surface conduit bearing capacity reinforcing device provided by the invention is used, the surface conduit bearing capacity reinforcing device can be used by directly lowering the surface conduit to primarily probe a mud surface, so that the surface conduit is ensured not to incline when entering mud, secondary lowering operation is avoided, the water flow resistance in seawater when the device is lowered can be reduced through the arranged truss supporting structure, the capacity of the surface conduit resisting external force interference is increased, secondary recycling is convenient, a large amount of time and cost can be saved for offshore drilling operation, the device has higher timeliness, the problems of unstable shallow stratum containing hydrate in deepwater and low stratum bearing capacity in jet operation are effectively solved, and the safe and smooth development of subsequent offshore oil and gas field development operation can be ensured.
2. When the lower surface conduit is jetted to operate in a shallow stratum with unstable hydrate in deep water, the natural gas hydrate in the stratum in the jetting range and the area nearby the jetting range can be decomposed, the strength and the stability of the stratum are greatly reduced, and the lateral frictional resistance provided by the stratum is reduced.
Drawings
Fig. 1 is a schematic view of an overall structure of a surface layer catheter load-bearing capacity enhancing device according to an embodiment of the present invention;
FIG. 2 is a front view of the superficial catheter load-bearing capacity enhancing device according to the embodiment of the present invention;
fig. 3 is a top view of fig. 2.
FIG. 4 is a left side view of FIG. 2;
the various reference numbers in the figures:
1-surface layer catheter; 2-upper fixing plate; 3-lower fixing plate; 4-truss support structure; 41-a four-corner truss; 42-triangular truss.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 4, the surface layer conduit bearing capacity reinforcing apparatus provided in this embodiment includes a surface layer conduit 1, an upper fixing plate 2, a lower fixing plate 3, and a truss support structure 4. Wherein, the upper fixing plate 2 and the lower fixing plate 3 are fixed outside the surface layer catheter 1 in parallel at intervals. The truss support structure 4 includes: the four-corner trusses 41 and the two groups of four-corner trusses 41 are respectively and fixedly connected to two opposite sides of the upper fixed top plate 2 and the lower fixed top plate 3; the triangular trusses 42 and the two groups of triangular trusses 42 are respectively and tightly connected to one sides, away from the upper fixing plate 2 and the lower fixing plate 3, of the two groups of four-corner trusses 41.
In the above embodiment, preferably, the surface layer guide tube 1 passes through the middle of the upper fixing plate 2 and the lower fixing plate 3, and the surface layer guide tube 1 is connected to the upper fixing plate 2 and the lower fixing plate 3 at an angle of 90 ° by welding.
In the above embodiment, the four-corner truss 41 is preferably a square four-corner truss, and the upper plane and the lower plane of the square four-corner truss are flush with the upper fixing plate 2 and the lower fixing plate 3, respectively.
In the above embodiment, preferably, the triangular truss 42 is an isosceles right-angle triangular truss, a right-angle surface of the isosceles right-angle triangular truss is fastened to a side surface of the square four-angle truss away from the upper fixing plate 2 and the lower fixing plate 3, and another right-angle surface of the isosceles right-angle triangular truss is flush with the lower fixing plate 3.
In the above embodiment, the thickness of the lower fixing plate 3 is preferably greater than that of the upper fixing plate 2, so that the formation bearing capacity and the self-stability can be enhanced.
Based on the surface layer conduit bearing capacity reinforcing device provided by the embodiment, the invention also provides an operation method of the surface layer conduit bearing capacity reinforcing device, the operation method can be applied to jet drilling operation of a hydrate-containing unstable shallow stratum so as to make up for insufficient stratum bearing capacity caused by jet, and the method specifically comprises the following steps:
s1, lowering a surface layer conduit bearing capacity reinforcing device from a carrier deck to the water, naturally sagging under the action of gravity, and forming an angle with the horizontal ground;
s2, the surface layer conduit bearing capacity reinforcing device is lowered to the bottom, the mud surface is initially detected and completely paved and unfolded, and the truss support structure 4 can reduce the frictional resistance of the surface layer conduit bearing capacity reinforcing device in water in the process of lowering until completely paving and unfolding, so that the subsequent operation is guaranteed to be carried out smoothly;
s3, after the surface layer conduit bearing capacity reinforcing device completely enters mud, the bottom surfaces of the lower fixing plate 3 and the truss supporting structure 4 are contacted with the sea bottom surface and slightly enter the mud, so that the contact area of the surface layer conduit bearing capacity reinforcing device and a soil body is increased, and the bearing capacity of a stratum to the surface layer conduit 1 is further improved;
s4, when the drilling well operation is finished, after the conduit cutting operation is finished, the surface conduit bearing capacity reinforcing device can be lifted to the water surface only by lifting the surface conduit bearing capacity reinforcing device through the drill rod, and then the surface conduit bearing capacity reinforcing device can be recycled.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A surface layer conduit bearing capacity reinforcing device is characterized by comprising a surface layer conduit (1), an upper fixing plate (2), a lower fixing plate (3) and a truss supporting structure (4);
the upper fixing plate (2) and the lower fixing plate (3) are fixed outside the surface layer catheter (1) in parallel at intervals;
the truss support structure (4) comprises:
the two groups of the four-corner trusses (41) are respectively and fixedly connected to two opposite sides of the upper fixing plate (2) and the lower fixing plate (3);
the two groups of triangular trusses (42) are respectively and fixedly connected to one sides, away from the upper fixing plate (2) and the lower fixing plate (3), of the two groups of four-corner trusses (41);
the four-corner truss (41) is a square four-corner truss, and the upper plane and the lower plane of the square four-corner truss are respectively flush with the upper fixing plate (2) and the lower fixing plate (3);
triangle truss (42) are isosceles right angle triangle truss, isosceles right angle triangle truss's a right angle face with square four corners truss is kept away from the side fastening connection of upper fixed plate (2) and bottom plate (3), another right angle face of isosceles right angle triangle truss with bottom plate (3) parallel and level.
2. The surface layer conduit bearing capacity reinforcing device according to claim 1, characterized in that the surface layer conduit (1) passes through the middle of the upper fixing plate (2) and the lower fixing plate (3), and the surface layer conduit (1) forms an angle of 90 degrees with the upper fixing plate (2) and the lower fixing plate (3) and is connected by welding.
3. Superficial catheter load enhancement device according to claim 1, characterized in that the thickness of the lower fixation plate (3) is greater than the thickness of the upper fixation plate (2).
4. A method of operating a surface conductor load enhancement device as claimed in any one of claims 1 to 3, wherein the method is applied to jet drilling operation of unstable shallow hydrate-containing formations, and comprises the following steps:
s1, lowering a surface layer conduit bearing capacity reinforcing device from a carrier deck to the water, naturally sagging under the action of gravity, and forming an angle with the horizontal ground;
s2, the surface layer conduit bearing capacity reinforcing device is lowered to the bottom, the mud surface is detected initially and is spread completely, the truss supporting structure (4) can reduce the frictional resistance of the surface layer conduit bearing capacity reinforcing device in water in the process of lowering until the surface layer conduit bearing capacity reinforcing device is spread completely, and the follow-up operation is guaranteed to be carried out smoothly;
s3, after the surface layer conduit bearing capacity reinforcing device completely enters mud, the bottom surfaces of the lower fixing plate (3) and the truss supporting structure (4) are contacted with the sea bottom surface and slightly enter the mud, so that the contact area of the surface layer conduit bearing capacity reinforcing device and a soil body is increased, and the bearing capacity of a stratum to the surface layer conduit (1) is further improved;
s4, when the operation of the drilling well is finished, after the cutting operation of the guide pipe is finished, the surface guide pipe bearing capacity reinforcing device can be lifted to the water surface only by lifting the surface guide pipe bearing capacity reinforcing device through the drill rod, and therefore the cyclic utilization of the surface guide pipe bearing capacity reinforcing device is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110637308.7A CN113236141B (en) | 2021-06-08 | 2021-06-08 | Surface layer conduit bearing capacity reinforcing device and operation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110637308.7A CN113236141B (en) | 2021-06-08 | 2021-06-08 | Surface layer conduit bearing capacity reinforcing device and operation method thereof |
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| Publication Number | Publication Date |
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| CN113236141A CN113236141A (en) | 2021-08-10 |
| CN113236141B true CN113236141B (en) | 2023-01-17 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4030310A (en) * | 1976-03-04 | 1977-06-21 | Sea-Log Corporation | Monopod drilling platform with directional drilling |
| CN201071503Y (en) * | 2007-08-01 | 2008-06-11 | 济南大学 | Giant frame structure conduit rack |
| CN101962946A (en) * | 2009-07-24 | 2011-02-02 | 中国海洋石油总公司 | Method for arranging hoisting points and floating-supported conduit frame with skirt pile sleeves |
| CN207377121U (en) * | 2017-05-10 | 2018-05-18 | 安徽鸿路钢结构(集团)股份有限公司 | The formwork erecting structure of concrete floor |
| CN208733662U (en) * | 2018-07-23 | 2019-04-12 | 上海交通大学 | Offshore wind turbine single-pile foundation with truss lateral support structure |
| CN109441371B (en) * | 2018-11-26 | 2023-12-08 | 中国石油大学(北京) | Internal rotation type catheter bearing capacity reinforcing device and application method thereof |
| CN110541418A (en) * | 2019-10-17 | 2019-12-06 | 中国石油大学(华东) | Self-locking nested deepwater drilling surface conduit and installation method thereof |
| CN111391986B (en) * | 2020-03-27 | 2022-02-01 | 中国海洋石油集团有限公司 | Floating type launching truss and jacket comprising same |
| CN111980594B (en) * | 2020-07-07 | 2022-07-12 | 中国海洋石油集团有限公司 | Temporary seabed base plate and method for installing deepwater surface layer conduits in batches |
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