A device for strengthening the bearing capacity of a deepwater surface conduit and a deepwater surface conduit device

Abstract

The present invention provides a device for strengthening the bearing capacity of a deepwater surface conduit and a deepwater surface conduit device, comprising: a pipe body defining a central axis; a sliding sleeve sleeved on the outside of the pipe body and capable of axially sliding; a plurality of bearing plates arranged at intervals around the pipe body, each bearing plate being hinged to the pipe body respectively to reciprocally swing between a retracted position and an opened position around the hinge point, the included angle between the bearing plate and the central axis when the bearing plate is in the opened position being greater than the included angle between the bearing plate and the central axis when the bearing plate is in the retracted position, each bearing plate being connected to the sliding sleeve through a linkage rod, and the sliding movement of the sliding sleeve and the swinging movement of the bearing plate being transmitted and converted through the linkage rod. By providing a plurality of bearing plates that can be opened and retracted, the present invention can effectively improve the bearing capacity of the formation, has a high degree of automation, strong controllability, stable structure, high timeliness, low economic cost, high safety and reliability, and can be reused, saving time and cost for offshore drilling operations.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore engineering drilling equipment, and in particular to a device for strengthening the bearing capacity of deepwater surface conduits and a deepwater surface conduit device. Background Art

[0002] Natural gas hydrate is a solid compound mainly composed of methane formed by natural gas and water under low temperature and high pressure conditions. It is usually located in the shallow strata tens of meters to within 300 m below the seabed, and more than 90% of its reserves are distributed in deepwater areas with a water depth exceeding 800 meters. During the development of offshore deepwater oil and gas fields, when implementing deepwater surface jet drilling operations, the drill pipe is connected to the drill bit to form a jet string, and high-speed fluid is ejected from the drill bit nozzle to impact and disturb the surrounding strata to form a wellbore, and then the surface conduit is run in.

[0003] However, when running the surface conduit by jetting in the formation containing natural gas hydrates, the natural gas hydrates in the formation within and near the jetting range will decompose, continuously releasing a large amount of methane gas and water, resulting in a rapid increase in the pore pressure in the decomposition zone, a significant reduction in the effective stress of the formation, and thus a substantial decrease in the strength and stability of the formation. The lateral frictional resistance between the surface conduit and the formation also decreases accordingly. The surface conduit and the subsea wellhead thereon are responsible for bearing the wellhead load and suspending each layer of casing, and their bearing capacity is mainly provided by the formation. When the wellhead load exceeds the bearing capacity that the formation can provide after the decomposition of hydrates, serious operation accidents such as wellhead subsidence, methane escape, and seabed subsidence will occur, causing huge economic losses and marine environmental pollution.

[0004] In order to improve the bearing capacity of the formation, the commonly used method is to increase the depth of the conduit run-in and extend the waiting time after the conduit is run in. However, this method has poor timeliness, high economic costs, high operation risks and difficulties, and will leave huge potential safety hazards for subsequent drilling operations and the production of deepwater oil and gas fields. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for strengthening the bearing capacity of deepwater surface conduits and a deepwater surface conduit device to solve the problems of poor timeliness, high economic costs, and high risk coefficients existing in the prior art when improving the bearing capacity of the formation by increasing the depth of the conduit run-in and extending the waiting time after the conduit is run in.

[0006] To achieve the above object, the present invention provides a device for strengthening the bearing capacity of a deepwater surface conduit, comprising: a pipe body defining a central axis; a sliding sleeve slidably sleeved outside the pipe body; a plurality of bearing plates arranged at intervals around the pipe body, each of the bearing plates being hinged to the pipe body to reciprocally swing around the hinge point between a retracted position and an extended position, the angle between the bearing plate and the central axis when the bearing plate is in the extended position being greater than the angle between the bearing plate and the central axis when the bearing plate is in the retracted position, each of the bearing plates being connected to the sliding sleeve by a linkage rod, and the sliding movement of the sliding sleeve and the swinging movement of the bearing plate being transmitted and converted through the linkage rod.

[0007] For the device for strengthening the bearing capacity of a deepwater surface conduit as described above, wherein the angle between the bearing plate and the central axis when the bearing plate is in the retracted position is greater than 0° and less than or equal to 30°.

[0008] For the device for strengthening the bearing capacity of a deepwater surface conduit as described above, wherein the angle between the bearing plate and the central axis when the bearing plate is in the extended position is not greater than 90°.

[0009] For the device for strengthening the bearing capacity of a deepwater surface conduit as described above, wherein the angle between the bearing plate and the central axis when the bearing plate is in the extended position is equal to 90°.

[0010] For the device for strengthening the bearing capacity of a deepwater surface conduit as described above, wherein the pipe body is hinged to the plurality of bearing plates through a plurality of support members fixed on its outer side wall, and the support members keep a gap between the bearing plate and the pipe body.

[0011] For the device for strengthening the bearing capacity of a deepwater surface conduit as described above, wherein the sliding sleeve comprises a cylinder body and a convex platform, the cylinder body is in sliding fit with the pipe body, the convex platform protrudes radially outward from the outer side wall of the cylinder body and extends along the circumferential direction of the cylinder body, and each of the linkage rods is hinged to the convex platform.

[0012] For the device for strengthening the bearing capacity of a deepwater surface conduit as described above, wherein a chute extending along the axial direction of the pipe body is provided on the outer side wall of the pipe body, the chute has two axially opposite ends, the sliding sleeve has a slider slidably fitted with the chute, and the slider can reciprocally slide between the two ends of the chute, and the sliding distance of the sliding sleeve and the swinging angle of the bearing plate between the extended position and the retracted position are defined by the chute.

[0013] The deepwater surface conduit bearing capacity strengthening device as described above, wherein connecting rods are fixed on the inner side surfaces of the bearing plates facing the conduit body, the connecting rods are arranged parallel to the length direction of the bearing plates, the connecting rods have a first hinged part hinged to the conduit body and a second hinged part hinged to the linkage rod, the first hinged part and the second hinged part are spaced apart in the length direction of the connecting rod, a receiving groove for receiving the linkage rod is arranged on the connecting rod along the length direction, the second hinged part is located between the two ends of the receiving groove, and when the bearing plate is in the retracted position, part of the linkage rod is located in the receiving groove.

[0014] The deepwater surface conduit bearing capacity strengthening device as described above, wherein the first hinged part is hinged to the conduit body through a first rotating shaft, the second hinged part is hinged to one end of the linkage rod through a second rotating shaft, the other end of the linkage rod is hinged to the sliding sleeve through a third rotating shaft, and the first rotating shaft, the second rotating shaft and the third rotating shaft are all perpendicular to the central axis.

[0015] The present invention also provides a deepwater surface conduit device, comprising the above-mentioned deepwater surface conduit bearing capacity strengthening device, a surface conduit and a subsea wellhead, and the surface conduit and the subsea wellhead are respectively connected to the two axial ends of the conduit body.

[0016] The characteristics and advantages of the deepwater surface conduit bearing capacity strengthening device and the deepwater surface conduit device of the present invention are as follows:

[0017] 1. By arranging a plurality of bearing plates that can be opened and retracted, the present invention can effectively improve the formation bearing capacity, has a high degree of automation, strong controllability, stable structure, high timeliness, low economic cost, high safety and reliability, can be reused, saves time and cost for offshore drilling operations, effectively solves the problem of low formation bearing capacity during jetting operations in deepwater hydrate-unstable shallow formations, and provides an important guarantee for the safe and efficient development of offshore oil.

[0018] 2. By setting the included angle between the bearing plate and the central axis to be greater than 0° and less than 30° when in the retracted position, the present invention can reduce the seawater resistance during the lowering process, prevent self-locking when the bearing plate contacts the mud surface, and facilitate the linkage rod to smoothly push the bearing plate to open.

[0019] 3. By setting the included angle between the bearing plate and the central axis to be equal to 90° when in the retracted position, the present invention makes the bearing plate contact the mud surface in a horizontal state, increases the contact area between the bearing plate and the formation, and thus increases the formation bearing capacity.

[0020] 4. The present invention keeps a gap between the bearing plate and the pipe body by setting a support member. When the bearing plate is in the open position, there is a gap between the bearing plate, the pipe body and the wellhead, and the drilling fluid for jetting operation and the cement slurry for cementing operation can smoothly pass through the gap, ensuring the smooth progress of subsequent operations. Description of the Drawings

[0021] The following drawings are only intended to schematically illustrate and explain the present invention, and do not limit the scope of the present invention. Among them:

[0022] Figure 1 is a schematic diagram of a deepwater surface conduit device according to an embodiment of the present invention when multiple bearing plates are in the retracted position;

[0023] Figure 2 is Figure 1 a cross-sectional view of the medium-depth water surface conduit device;

[0024] Figure 3 is Figure 1 a schematic diagram of the medium-depth water surface conduit device in an inclined state;

[0025] Figure 4 is a schematic diagram of a deepwater surface conduit device according to an embodiment of the present invention when multiple bearing plates swing towards the open position;

[0026] Figure 5 is Figure 4 a cross-sectional view of the medium-depth water surface conduit device;

[0027] Figure 6 is Figure 4 a schematic diagram of the medium-depth water surface conduit device in an inclined state;

[0028] Figure 7 is a schematic diagram of a deepwater surface conduit device according to an embodiment of the present invention when multiple bearing plates are in the open position;

[0029] Figure 8 is Figure 7 a cross-sectional view of the medium-depth water surface conduit device;

[0030] Figure 9 is Figure 7 a schematic diagram of the medium-depth water surface conduit device in an inclined state;

[0031] Figure 10 is a three-dimensional structural schematic diagram of a deepwater surface conduit bearing capacity strengthening device according to an embodiment of the present invention;

[0032] Figure 11 is a structural schematic diagram of a bearing plate according to an embodiment of the present invention;

[0033] Figure 12 is a structural schematic diagram of a pipe body according to an embodiment of the present invention;

[0034] Figure 13 is a schematic structural view of a sliding sleeve according to an embodiment of the present invention;

[0035] Figure 14 is a schematic structural view of a connecting rod according to an embodiment of the present invention;

[0036] Figure 15 is a schematic structural view of a linkage rod according to an embodiment of the present invention.

[0037] Description of main component labels:

[0038] 1, pipe body; 101, chute;

[0039] 2, sliding sleeve; 201, cylinder body; 202, boss; 203, reinforcing rib; 204, slider;

[0040] 3, bearing plate; 301, avoidance groove; 4, linkage rod; 5, surface conduit; 6, subsea wellhead;

[0041] 7, support member; 8, reinforcing rib; 9, connecting rod; 901, first hinge part;

[0042] 902, second hinge part; 903, receiving groove;

[0043] 10, first rotating shaft; 11, second rotating shaft; 12, third rotating shaft. Detailed implementation manners

[0044] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings. Among them, the use of the adjectival or adverbial modifiers "upper" and "lower", "top" and "bottom", "inner" and "outer" is only for the convenience of relative reference between multiple groups of terms, and does not describe any specific directional limitation on the modified terms. Additionally, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0045] In the description of the present invention, unless otherwise specified, the term "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0046] Unless otherwise indicated by a separately defined direction, the up, down, and other directions involved in this article are based on the up, down, and other directions shown in the present invention. Figure 1 This is hereby stated for all.

[0047] Embodiment 1

[0048] As Figures 1 to 10 shown, the present invention provides a deep - water surface conduit bearing capacity strengthening device, including a pipe body 1, a sliding sleeve 2, and a plurality of bearing plates 3 (as Figure 10 shown). The pipe body 1 defines a central axis O, and the sliding sleeve 2 is axially slidably sleeved outside the pipe body 1; a plurality of bearing plates 3 are arranged around the pipe body 1 at intervals, and each bearing plate 3 is respectively hinged to the pipe body 1 to swing reciprocally between a retracted position and an opened position around the hinge point. When the bearing plate 3 is in the opened position (as Figures 7 to 9 shown), the included angle between it and the central axis O is greater than the included angle when it is in the retracted position (as Figures 1 to 3 shown), that is, the plurality of bearing plates 3 have a retracted state when in the retracted position and an opened state when in the opened position. When the plurality of bearing plates 3 are in the retracted state, they are juxtaposed around the pipe body 1 (as Figures 1 to 3 shown) for easy lowering in seawater. When the plurality of bearing plates 3 are in the opened state, they are generally in an umbrella - like shape (as Figures 7 to 9 shown) to support on the seabed mud surface; each bearing plate 3 is respectively connected to the sliding sleeve 2 through a linkage rod 4, and the sliding movement of the sliding sleeve 2 and the swinging movement of the bearing plate 3 are transmitted and converted through the linkage rod 4.

[0049] When the strengthening device of the present invention is applied to deep - water hydrate - containing unstable shallow - formation jet drilling operations, the lower end of the pipe body 1 is connected to the surface conduit 5, and the upper end of the pipe body 1 is connected to the subsea wellhead 6, thereby forming a deep - water surface conduit device (as Figures 1 to 9 shown).

[0050] The method of lowering the conduit device into the seabed formation is as follows:

[0051] At first, the conduit device is lowered into the water in a vertical state from the carrier deck (as Figure 1 shown). During the lowering process, the surface conduit 5 faces downward, the subsea wellhead 6 faces upward, and a plurality of bearing plates 3 naturally hang down under the action of gravity and are in the retracted position, and the seawater resistance during the lowering process is small;

[0052] After that, when the conduit device is lowered to the seabed mud surface, the surface conduit 5 first enters the mud. As the depth of entry into the mud increases, the sliding sleeve 2 contacts the mud surface. Due to the resistance of the mud surface, the sliding sleeve 2 slides upward relative to the pipe body 1 and drives the linkage rod 4 to rotate. The rotation of the linkage rod 4 drives the bearing plate 3 to swing towards the outside of the pipe body 1 (as Figures 4 to 6As shown in the figure, when the carrier plate 3 swings to the open position (such as Figures 7 to 9 As shown), multiple carrier plates 3 are supported on the seabed mud surface, that is, the surface conduit 5 and multiple carrier plates 3 are in contact with the formation at the same time. Compared with the prior art where only the surface conduit is in contact with the formation, the contact area with the formation is increased, thereby increasing the bearing capacity of the formation for the deepwater surface conduit device, eliminating the operation risks caused by insufficient formation bearing capacity. In addition, the multiple carrier plates 3 supported on the mud surface can also prevent the underwater wellhead 6 from tilting and avoid secondary lowering, saving time and cost for the drilling operation;

[0053] Finally, when the drilling operation is completed, only need to lift the conduit device with the drill pipe, and the multiple carrier plates 3 will automatically swing to the retracted position under the action of gravity, lifting the conduit device above the water surface.

[0054] The reinforcement device of the present invention can effectively improve the formation bearing capacity, has a high degree of automation, strong controllability, stable structure, high timeliness, low economic cost, high safety and reliability, and can be reused, saving time and cost for offshore drilling operations, effectively solving the problem of low formation bearing capacity during jetting operations in deepwater hydrate-containing unstable shallow formations, and providing an important guarantee for the safe and efficient development of offshore oil.

[0055] In an embodiment, as Figures 1 to 3 As shown, when the carrier plate 3 is in the retracted position, the angle between it and the central axis O is greater than 0° and less than or equal to 30°. For example, this angle is 15°, 20°, 25° or 30°, that is, the carrier plate 3 is not perpendicular to the horizontal plane during the lowering process of the conduit device, but is inclined at a relatively small angle with respect to the horizontal plane, which can prevent the carrier plate 3 from forming self-locking when contacting the mud surface, facilitating the link rod 4 to smoothly push the carrier plate 3 to open.

[0056] In an embodiment, when the carrier plate 3 is in the open position, the angle between it and the central axis O is not greater than 90°. Preferably, when the carrier plate 3 is in the open position, the angle between it and the central axis O is equal to 90° (as Figures 7 to 9 As shown), so that the carrier plate 3 contacts the mud surface in a horizontal state, increasing the contact area between the carrier plate 3 and the formation, thereby increasing the formation bearing capacity.

[0057] When the carrier plate 3 contacts the mud surface in a horizontal state, the carrier plate 3 slightly penetrates into the mud and is parallel to the seabed mud surface. The angle between the link rod 4 and the carrier plate 3 reaches the minimum. The carrier plate 3, the pipe body 1 and the link rod 4 enclose a stable right triangle shape, with a firm and stable structure, forming a stable support for the underwater wellhead 6 and keeping the underwater wellhead 6 in a state perpendicular to the formation.

[0058] In an embodiment, as Figure 3 、 Figure 11As shown, the bearing plate 3 is a flat plate, and the bearing plate 3 is trapezoidal as a whole. The width of the lower end of the bearing plate 3 is greater than the width of the upper end of the bearing plate 3. Under the premise of ensuring that multiple bearing plates 3 do not interfere with each other when in the retracted position, the surface area of the bearing plate 3 can be increased by increasing the width of the lower end of the bearing plate 3 as much as possible, thereby further increasing the contact area between the bearing plate 3 and the formation, and further increasing the bearing capacity of the formation.

[0059] In one embodiment, if Figure 10 , Figure 12 As shown, the pipe body 1 is hinged to multiple bearing plates 3 through multiple supporting members 7 fixed on its outer side wall. The supporting members 7 keep the bearing plates 3 and the pipe body 1 spaced from each other. When the bearing plates 3 are in the open position, there is a gap (such as Figure 9 As shown in the figure, the drilling fluid for jetting operations and the cement slurry for cementing operations can pass smoothly through the gaps, ensuring the smooth progress of subsequent operations.

[0060] For example, Figure 12 As shown, the support member 7 is a triangular bracket, one vertex of which is hinged to the bearing plate 3, and the bearing plate 3 is provided with an avoidance groove 301 (as shown in FIG. Figure 11 As shown), to prevent interference between the supporting plate 3 and the triangular bracket during the swinging process; in addition, the two corners of the supporting plate 3 close to the tube body 1 can be chamfered.

[0061] exist Figure 10 In the example, there are four bearing plates 3, which are arranged at equal intervals along the circumference of the tube body 1; there are four supporting members 7, which are arranged at equal intervals along the circumference of the tube body 1 and correspond one to one to the four bearing plates 3; there are four connecting rods 4, which are respectively connected to the four bearing plates 3.

[0062] In one embodiment, if Figure 11 As shown, a plurality of reinforcing ribs 8 are provided on the surface of each bearing plate 3. For example, the reinforcing ribs 8 are provided on the inner side of the bearing plate 3 facing the pipe body 1. The plurality of reinforcing ribs 8 are arranged at intervals along the width direction of the bearing plate 3. Each reinforcing rib extends along the length direction of the bearing plate 3 to improve the structural strength and tensile strength of the bearing plate 3, thereby improving the bearing strength of the catheter device on the underwater wellhead 6.

[0063] In one embodiment, if Figure 13 As shown, the sliding sleeve 2 includes a cylinder 201 and a boss 202. The cylinder 201 is slidably matched with the tube body 1. The boss 202 radially protrudes outward from the outer wall of the cylinder 201 and extends along the circumference of the cylinder 201. Each linkage rod 4 is hinged to the boss 202. For example, the outer contour of the boss 202 is an octagon.

[0064] Further,Figure 13 As shown, a plurality of reinforcing ribs 203 are connected between the outer side wall of the cylinder body 201 and the boss 202. The plurality of reinforcing ribs 203 are arranged at intervals along the circumferential direction of the cylinder body 201 to improve the structural strength of the sliding sleeve 2.

[0065] In one embodiment, as Figure 12 、 Figure 13 shown, a chute 101 extending along the axial direction of the pipe body 1 is provided on the outer side wall of the pipe body 1. The chute 101 has two axially opposite ends. The sliding sleeve 2 has a slider 204 that slidably cooperates with the chute 101. For example, the slider 204 is a rib protruding radially inward from the inner wall surface of the cylinder body 201. The slider 204 can reciprocally slide between the two ends of the chute 101. That is, the chute 101 is used to guide the axial sliding of the sliding sleeve 2, limit the rotation of the sliding sleeve 2, and define the sliding distance of the sliding sleeve 2, thereby defining the swing angle of the bearing plate 3 between the open position and the retracted position. Specifically, when the slider 204 abuts against the upper end surface of the chute 101, the sliding sleeve 2 slides to the upper limit position, and the bearing plate 3 is in the open position; when the slider 204 abuts against the lower end surface of the chute 101, the sliding sleeve 2 slides to the lower limit position, and the bearing plate 3 is in the retracted position.

[0066] As Figure 12 、 Figure 13 shown, a plurality of chutes 101 are provided on the outer side wall of the pipe body 1. The plurality of chutes 101 are arranged at intervals along the circumferential direction of the pipe body 1. Correspondingly, a plurality of sliders 204 are provided on the inner side wall of the cylinder body 201. The plurality of sliders 204 can be slidably inserted into the plurality of chutes 101 respectively. By providing the plurality of chutes 101, the sliding of the sliding sleeve 2 is made smoother.

[0067] In one embodiment, as Figure 10 、 Figure 14 shown, a connecting rod 9 is fixed on the inner side surface of each bearing plate 3 facing the pipe body 1. The connecting rod 9 is arranged parallel to the length direction of the bearing plate 3. The connecting rod 9 has a first hinged part 901 hinged to the pipe body 1 and a second hinged part 902 hinged to the linkage rod 4. That is, the bearing plate 3 is hinged to the pipe body 1 and the linkage rod 4 through the connecting rod 9. The first hinged part 901 and the second hinged part 902 are spaced apart in the length direction of the connecting rod 9. An accommodation groove 903 for accommodating the linkage rod 4 is provided along the length direction of the connecting rod 9. The second hinged part 902 is located between the two ends of the accommodation groove 903. When the bearing plate 3 is in the retracted position, a part of the linkage rod 4 is located in the accommodation groove 903 to reduce the resistance received when the device is lowered in seawater.

[0068] In a specific embodiment, as Figure 10 shown, the first hinged part 901 is hinged to the support member 7 on the pipe body 1 through a first rotating shaft 10 (as Figure 12 、 Figure 14As shown, the second hinge portion 902 is hinged to one end of the linkage rod 4 through the second rotating shaft 11 (as Figure 14 , Figure 15 shown), the other end of the linkage rod 4 is hinged to the sliding sleeve 2 through the third rotating shaft 12 (as Figure 13 , Figure 15 shown), and the first rotating shaft 10, the second rotating shaft 11 and the third rotating shaft 12 are all perpendicular to the central axis O.

[0069] To ensure smooth rotation, bearings can also be respectively arranged outside the first rotating shaft 10, the second rotating shaft 11 and the third rotating shaft 12, and each rotating shaft is supported to rotate through the bearings.

[0070] For example, specifically, as Figure 14 shown, one end of the connecting rod 9 can be the first hinge portion 901 for hinging with the support member 7 through the first rotating shaft 10. The connecting rod 9 has opposite first and second side surfaces. The first side surface of the connecting rod 9 is fixedly welded to the inner side surface of the bearing plate 3. The receiving groove 903 is arranged on the second side surface of the connecting rod 9, and the receiving groove 903 extends along the length direction of the connecting rod 9 to the other end of the connecting rod 9 to receive the linkage rod 4. The middle part of the receiving groove 903 can be the second hinge portion 902 to be hinged with the linkage rod 4 through the second rotating shaft 11. The third rotating shaft 12 is arranged in the boss 202 of the sliding sleeve 2 (as Figure 13 shown) to hinge the boss 202 and the linkage rod 4.

[0071] Embodiment 2

[0072] As Figures 1 to 9 shown, the present invention further provides a deepwater surface conduit device, which includes the deepwater surface conduit bearing capacity strengthening device of Embodiment 1, the surface conduit 5 and the subsea wellhead 6. The surface conduit 5 and the subsea wellhead 6 are respectively connected to the axial two ends of the pipe body 1.

[0073] Specifically, the pipe body 1 has an upper end and a lower end. The upper end of the pipe body 1 is the end towards which the bearing plate 3 slides when driven by the sliding sleeve 2 to open. The surface conduit 5 is connected to the lower end of the pipe body 1, and the subsea wellhead 6 is connected to the upper end of the pipe body 1.

[0074] The deepwater surface conduit bearing capacity strengthening device in this embodiment has the same structure, working principle and beneficial effects as those of Embodiment 1, and will not be elaborated here.

[0075] The above description is only an illustrative specific implementation mode of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any technician in the field without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention. It should also be noted that the various components of the present invention are not limited to the above-mentioned overall application. The various technical features described in the specification of the present invention can be selected one by one or multiple ones can be selected and used in combination according to actual needs. Therefore, the present invention naturally covers other combinations and specific applications related to the invention point of this case.

Claims

1. A device for strengthening the bearing capacity of deep - water surface conduits, characterized in that, Comprising: A pipe body defining a central axis; A sliding sleeve slidably sleeved outside the pipe body; A plurality of bearing plates arranged at intervals around the pipe body. Each of the bearing plates is hinged to the pipe body respectively to reciprocally swing between a retracted position and an opened position around the hinge point. The included angle between the bearing plate and the central axis when the bearing plate is in the opened position is greater than the included angle between the bearing plate and the central axis when the bearing plate is in the retracted position. Each of the bearing plates is connected to the sliding sleeve through a linkage rod, and the sliding movement of the sliding sleeve and the swinging movement of the bearing plate are transmitted and converted through the linkage rod; Wherein, the included angle between the bearing plate and the central axis when the bearing plate is in the retracted position is greater than 0° and less than or equal to 30°, and the included angle between the bearing plate and the central axis when the bearing plate is in the opened position is not greater than 90°.

2. The deepwater surface conduit bearing capacity strengthening device according to claim 1, wherein The included angle between the bearing plate and the central axis when the bearing plate is in the opened position is equal to 90°.

3. The deepwater surface conduit bearing capacity strengthening device according to claim 1, wherein The pipe body is hinged to the plurality of bearing plates through a plurality of supporting members fixed on its outer side wall, and the supporting members keep a space between the bearing plate and the pipe body.

4. The deepwater surface conduit bearing capacity strengthening device according to claim 1, wherein, The sliding sleeve includes a cylinder body and a convex platform. The cylinder body is in sliding fit with the pipe body. The convex platform protrudes radially outward from the outer side wall of the cylinder body and extends along the circumferential direction of the cylinder body. Each of the linkage rods is hinged to the convex platform respectively.

5. The deepwater surface conduit bearing capacity strengthening device according to claim 1, wherein A chute extending along the axial direction of the pipe body is provided on the outer side wall of the pipe body. The chute has two axially opposite ends. The sliding sleeve has a slider slidably fitted with the chute. The slider can reciprocally slide between the two ends of the chute, and the sliding distance of the sliding sleeve and the swinging angle of the bearing plate between the opened position and the retracted position are defined by the chute.

6. The deepwater surface conduit bearing capacity strengthening device according to claim 1, characterized in that, A connecting rod is fixed on the inner side surface of each of the bearing plates facing the pipe body. The connecting rod is arranged parallel to the length direction of the bearing plate. The connecting rod has a first hinge part hinged to the pipe body and a second hinge part hinged to the linkage rod. The first hinge part and the second hinge part are spaced apart in the length direction of the connecting rod. An accommodating groove for accommodating the linkage rod is provided on the connecting rod along the length direction. The second hinge part is located between the two ends of the accommodating groove. When the bearing plate is in the retracted position, part of the linkage rod is located in the accommodating groove.

7. The deepwater surface conduit bearing capacity strengthening device according to claim 6, characterized in that The first hinge part is hinged to the pipe body through a first rotating shaft, the second hinge part is hinged to one end of the linkage rod through a second rotating shaft, and the other end of the linkage rod is hinged to the sliding sleeve through a third rotating shaft. The first rotating shaft, the second rotating shaft and the third rotating shaft are all perpendicular to the central axis.

8. A deepwater surface conduit device, characterized in that, Comprising the deepwater surface conduit bearing capacity strengthening device according to any one of claims 1 to 7, a surface conduit and a subsea wellhead. The surface conduit and the subsea wellhead are respectively connected to the two axial ends of the pipe body.

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