CN211312585U - Combined suction anchor - Google Patents
Combined suction anchor Download PDFInfo
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- CN211312585U CN211312585U CN201921542484.7U CN201921542484U CN211312585U CN 211312585 U CN211312585 U CN 211312585U CN 201921542484 U CN201921542484 U CN 201921542484U CN 211312585 U CN211312585 U CN 211312585U
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Abstract
A combined suction anchor belongs to the technical field of submarine drilling. The combined suction anchor comprises a plurality of groups of vertically arranged cylinders and base pipes; the top end of each cylinder is closed, the lower end of each cylinder is open, the top end of each cylinder is provided with an air outlet and a water suction port, the water suction ports are connected with a water suction pump in a hydraulic control system of the suction anchor penetration equipment through pipelines, the opening and closing actions of the air outlets and the water suction ports in each group of cylinders are independently controlled by the hydraulic control system, two adjacent groups of cylinders are connected in a welding mode through outer side rib plates, and the cylinders and the outer side rib plates are enclosed to form an annular structure with the upper end and the lower end open; the base tubes are arranged in the cylinder and/or in the annular structure, and the two adjacent base tubes and the base tubes, the side wall of the cylinder and the outer side rib plates are connected in a welding mode through the inner side rib plates. The utility model discloses an innovative design to modular suction anchor structure has reached the purpose that improves deep sea well head stability.
Description
Technical Field
The utility model relates to a suction anchor, especially a modular suction anchor.
Background
In the submarine drilling engineering, the suction anchor is a submarine pile foundation developed for solving the problems of bearing of a submarine soft foundation and enhancing the stability of a wellhead, and the specific structure of the submarine pile foundation is as follows: the outside is provided with a cylinder with a closed top end and an open lower end, the top end of the cylinder is provided with a water suction port, and the water suction port is connected with a suction pump through a pipeline. When the suction anchor cylinder body is penetrated into the seabed, the seawater can be pumped out from the cylinder body by using a suction pump and is penetrated into the seabed mud layer by depending on the pressure difference between the inner pressure and the outer pressure of the cylinder body. With the development of ocean engineering technology, the cylindrical suction anchor is widely applied to the fields of offshore wind power foundations, oil platform foundations, drilling jacket foundations and the like, and when deep sea drilling operation is carried out, the suction anchor is used as a seabed wellhead stabilizing base, acts like a rigid short pile, and needs to bear huge loads brought by an upper blowout preventer and bending loads related to influences of seabed ocean currents and the like.
In the prior art, most of suction anchors serving as seabed wellhead stabilizing bases adopt single-cylinder structures, and due to the fact that seabed terrain structures are complex, the suction anchors of the single-cylinder structures are difficult to provide enough stable supporting force under the condition that seabed foundations are soft, and therefore a combined type suction anchor capable of improving the stability of a deep sea wellhead needs to be optimally designed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a modular suction anchor to reach the purpose that improves deep sea well head stability.
The above object of the present invention is achieved by the following technical solutions:
a combined suction anchor comprises a plurality of groups of vertically arranged cylinders and base pipes; the top end of each cylinder is closed, the lower end of each cylinder is open, the top end of each cylinder is provided with an air outlet and a water suction port, the water suction ports are connected with a water suction pump in a hydraulic control system of the suction anchor penetration equipment through pipelines, the opening and closing actions of the air outlets and the water suction ports in each group of cylinders are independently controlled by the hydraulic control system, two adjacent groups of cylinders are connected in a welding mode through outer side rib plates, and the cylinders and the outer side rib plates are enclosed to form an annular structure with the upper end and the lower end open; the base tubes are arranged in the cylinder and/or in the annular structure, and the two adjacent base tubes and the base tubes, the side wall of the cylinder and the outer side rib plates are connected in a welding mode through the inner side rib plates.
According to the combined type suction anchor, the number of the cylinder bodies is two, and the two groups of cylinder bodies and the outer side rib plate are enclosed to form the straight-shaped ring with the upper end and the lower end open.
The base pipes are arranged in three groups, and the base pipes in the three groups are respectively arranged in the two groups of cylinders and in the middle of the linear ring.
In the combined suction anchor, the number of the base pipes is two, and the two base pipes are uniformly distributed in the linear ring.
In the combined type suction anchor, the number of the cylinders is three, and the three groups of cylinders and the outer side rib plate are enclosed to form a triangular ring with the upper end and the lower end open; the base pipe is arranged inside the cylinder and/or in a triangular ring.
In the combined suction anchor, the number of the cylinders is four, and the four groups of cylinders and the outer side rib plates form a square ring with open upper and lower ends; the base pipe is arranged inside the cylinder and/or in a square ring.
According to the combined type suction anchor, the number of the cylinder bodies is six, and six groups of cylinder bodies and outer side rib plates are enclosed to form a hexagonal ring with open upper and lower ends; the base pipe is arranged inside the cylinder and/or in a hexagonal ring.
The utility model provides a modular suction anchor, modular suction anchor is integrated as an organic whole with a plurality of barrel of group and parent tube to enclose a plurality of barrel of group through outside gusset and synthetic open annular structure in both ends from top to bottom, not only formed a firm whole foundation structure at the seabed well head from this, but also can install the pipe in the parent tube with the injection mode, bear preventer load by parent tube and pipe jointly, thereby improved the stability of deep sea well head greatly.
Drawings
Fig. 1 is a schematic structural view of a combined suction anchor (taking a double-cylinder combined suction anchor as an example) according to the present invention;
FIG. 2 is a top view of a first embodiment of a dual-barrel combination suction anchor;
FIG. 3 is a top view of a second embodiment of a dual-barrel combination suction anchor;
FIG. 4 is a top view of a modular suction anchor made up of three sets of cartridges;
FIG. 5 is a top view of a modular suction anchor made up of four sets of cartridges;
fig. 6 is a top view of a modular suction anchor made up of six sets of cartridges.
The reference numbers in the figures are: 1. 1-1 parts of a cylinder body, 1-2 parts of an air outlet and a water suction port; 2. a base pipe; 3. an inner side rib plate; 4. and an outer side rib plate.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1, the combined suction anchor of the present invention comprises a plurality of sets of vertically arranged cylinders 1 and base pipes 2; the top end of the cylinder body 1 is closed, the lower end of the cylinder body is opened, the top end of the cylinder body is provided with an air outlet 1-1 and a water suction port 1-2, the water suction port 1-2 is connected with a water suction pump in a hydraulic control system of suction anchor penetration equipment through a pipeline, the opening and closing actions of the air outlet 1-1 and the water suction port 1-2 in each group of cylinder bodies 1 are independently controlled by the hydraulic control system, two adjacent groups of cylinder bodies 1 are connected in a welding mode through outer side rib plates 4, and the cylinder body 1 and the outer side rib plates 4 form an annular structure with opened upper and lower ends; the base pipes 2 are arranged in the cylinder body 1 and/or in an annular structure, and the base pipes 2 in two adjacent groups and the base pipes 2, the side wall of the cylinder body 1 and the outer side rib plates 4 are connected in a welding mode through the inner side rib plates 3.
Referring to fig. 2 and 3, the preferred embodiment of the combined type suction anchor of the present invention is a double-cylinder combined type suction anchor, the number of the cylinder 1 of the double-cylinder combined type suction anchor is two, and the two cylinder 1 and the outer rib plate 4 form a straight-line-shaped ring with open upper and lower ends; the number of the base pipes 2 is two or three, wherein in the technical scheme of adopting three groups of base pipes 2, the three groups of base pipes 2 are respectively arranged in the two groups of cylinders 1 and in the middle of the linear ring (as shown in figure 2); in the technical scheme of adopting two groups of base tubes 2, the two groups of base tubes 2 are all arranged in a linear ring (as shown in attached figure 3).
Referring to fig. 4, another preferred embodiment of the combined suction anchor of the present invention is a combined suction anchor composed of three sets of cylinders, in the technical solution of this embodiment, a triangular ring with open upper and lower ends is enclosed by three sets of cylinders 1 and an outer rib plate 4; the number of base pipes 2 in the combined suction anchor is preferably four, arranged in the interior of the cylinder 1 and/or in a triangular ring.
Referring to fig. 5, another preferred embodiment of the combined suction anchor of the present invention is a combined suction anchor composed of four groups of cylinders, in the technical solution of this embodiment, a square ring with open upper and lower ends is enclosed by four groups of cylinders 1 and outer side rib plates 4; the number of base pipes 2 in the combined suction anchor is preferably four, arranged inside the cylinder 1 and/or in a square ring.
Referring to fig. 6, another preferred embodiment of the combined suction anchor of the present invention is a combined suction anchor composed of six sets of cylinders, in the technical solution of this embodiment, six sets of cylinders 1 and outer rib plates 4 enclose to form a hexagonal ring with open upper and lower ends; the number of base pipes 2 in the combined suction anchor is preferably four, arranged inside the cylinder 1 and/or in a hexagonal ring.
The above is only a description of several preferred embodiments of the combined suction anchor, and the combined suction anchor can also adopt a mode of combining cylinders with different numbers, such as five groups of cylinders, eight groups of cylinders, and the like, and the basic structures thereof are the same, and are not described again.
The combined suction anchor is operated according to the following steps when the seabed penetration operation is carried out:
a. the combined suction anchor is used for hoisting the sewage, the air outlets 1-1 at the top ends of all the cylinder bodies 1 are opened, and the cylinder bodies 1 slowly penetrate into the seabed mud layer under the action of the self gravity;
b. when the combined suction anchor penetrates into the seabed by a certain depth, the self gravity of the combined suction anchor is balanced with the resistance of the seabed mud layer, and the self-weight penetration stops;
c. measuring the penetration depth of each group of the cylinders 1 and the inclination angle of the combined suction anchor by a detection instrument;
d. according to the measured penetration depth of each group of cylinders and the inclination angle data of the combined suction anchor, the difference of the penetration depths of different cylinders in the combined suction anchor is judged, an air outlet 1-1 on the cylinder 1 with the shallower penetration depth is closed, a suction pump corresponding to a water suction port 1-2 of the cylinder is started, seawater is pumped out of the cylinder 1, the cylinder continues to penetrate under the action of the internal and external pressure difference, and the penetration depths of all the cylinders 1 are consistent by correcting the penetration depth of each group of cylinders 1;
e. when the penetration depth of all the cylinders 1 is consistent and the inclination angle of the combined suction anchor meets the technical requirements, the operation of the suction pump is stopped;
f. closing the air outlets 1-1 on all the cylinder bodies, starting the water suction pumps of all the cylinder bodies, pumping the seawater out of the cylinder bodies 1 to form negative pressure, and continuously injecting the cylinder bodies along with the increase of the negative pressure;
g. in the negative pressure injection process, measuring the injection depth of each group of cylinders 1 and the inclination angle of the combined suction anchor in real time through a detection instrument;
h. according to the data measured by the negative pressure injection process detecting instrument, judging whether the inclination angle of the combined suction anchor meets the technical requirements, adjusting the corresponding cylinder injection depth according to the method of the step d, keeping the injection depths of all cylinders consistent in the negative pressure injection process, and ensuring that the combined suction anchor is vertically and stably injected into the seabed as a whole;
i. when the penetration depth of the combined suction anchor into the seabed meets the technical requirements, stopping all the suction pumps from operating;
j. measuring the penetration depth of each group of the cylinders 1 and the inclination angle of the combined suction anchor by using a detection instrument, and repeating the operation of the step d according to the measurement data to ensure that the penetration depths of all the cylinders 1 are consistent;
k. the pipe is installed inside the base pipe 2 using jet pipe drilling techniques, namely: and (2) putting a drill bit and a drill rod into the guide pipe, flushing and mixing the sediment at the bottom of the guide pipe by the drilling liquid through the drill rod and the drill bit, returning the drilling liquid out along the annular gap between the inner wall of the guide pipe and the drill rod, sinking the pilot hole drilled by the drill bit to the designed depth under the action of the self weight of the guide pipe and the gravity of the jet flow of the drilling liquid, and stabilizing the guide pipe by utilizing the adhesive force and the friction force of the soil on the surrounding seabed after the jet drilling is in place, so that the seabed penetration.
Claims (7)
1. A modular suction anchor which characterized in that: the combined suction anchor comprises a plurality of groups of vertically arranged cylinders (1) and base pipes (2); the top end of the cylinder body (1) is closed, the lower end of the cylinder body is open, the top end of the cylinder body is provided with an air outlet (1-1) and a water suction port (1-2), the water suction port (1-2) is connected with a water suction pump in a hydraulic control system of the suction anchor penetration equipment through a pipeline, the opening and closing actions of the air outlet (1-1) and the water suction port (1-2) in each group of cylinder body (1) are independently controlled by the hydraulic control system, two adjacent groups of cylinder bodies (1) are connected in a welding mode through outer side rib plates (4), and the cylinder body (1) and the outer side rib plates (4) enclose to form an annular structure with the open upper end; the base pipes (2) are arranged in the cylinder body (1) and/or in an annular structure, and the two adjacent base pipes (2) and the side wall of the cylinder body (1) and the outer side rib plates (4) are connected in a welding mode through the inner side rib plates (3).
2. The modular suction anchor of claim 1, wherein: the number of the cylinder bodies (1) is two, and the two groups of cylinder bodies (1) and the outer side rib plates (4) are enclosed to form a straight-line-shaped ring with the upper end and the lower end open.
3. The modular suction anchor of claim 2, wherein: the number of the base pipes (2) is three, and the three base pipes (2) are respectively arranged in the two groups of cylinders (1) and in the middle of the linear ring.
4. The modular suction anchor of claim 2, wherein: the number of the base tubes (2) is two, and the two base tubes (2) are all arranged in a linear ring.
5. The modular suction anchor of claim 1, wherein: the number of the cylinders (1) is three, and three groups of cylinders (1) and outer side rib plates (4) are enclosed to form triangular rings with open upper and lower ends; the base pipe (2) is arranged inside the cylinder (1) and/or in a triangular ring.
6. The modular suction anchor of claim 1, wherein: the number of the cylinder bodies (1) is four, and the four cylinder bodies (1) and the outer side rib plates (4) are enclosed to form square rings with open upper and lower ends; the base pipe (2) is arranged inside the cylinder and/or in a square ring.
7. The modular suction anchor of claim 1, wherein: the number of the cylinders (1) is six, and six groups of cylinders (1) and outer side rib plates (4) are enclosed to form a hexagonal ring with open upper and lower ends; the base pipe (2) is arranged inside the cylinder and/or in a hexagonal ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921542484.7U CN211312585U (en) | 2019-09-17 | 2019-09-17 | Combined suction anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921542484.7U CN211312585U (en) | 2019-09-17 | 2019-09-17 | Combined suction anchor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211312585U true CN211312585U (en) | 2020-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921542484.7U Active CN211312585U (en) | 2019-09-17 | 2019-09-17 | Combined suction anchor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211312585U (en) |
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2019
- 2019-09-17 CN CN201921542484.7U patent/CN211312585U/en active Active
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