Keel joint protection device, keel joint assembly, top tensioning type stand pipe, oil production platform and keel joint assembly design method

Abstract

The invention provides a keel node protection device, a keel node assembly, a top tensioning type stand pipe, an oil production platform and a keel node assembly design method.The keel node protection device comprises a mounting base, a plurality of supports and a plurality of elastomers, and the mounting base is used for being arranged on the outer side of a smooth transition section of a keel node in a sleeving mode; the keel joint is used for being connected between two adjacent single production vertical pipes of the top tensioning type vertical pipe, and the outer diameter of the smooth transition section of the keel joint is constant. The multiple supports are distributed in the circumferential direction of the mounting base, one end of each support is connected with the mounting base, and the other end of each support extends in the direction away from the mounting base in the radial direction of the mounting base. The multiple elastic bodies are arranged at the ends, away from the mounting base, of the multiple supports in a one-to-one correspondence mode. When the platform body and the top tensioning type vertical pipe move relatively and collide, the elastic body can make contact with the inner wall of the keel of the platform body, the elastic body can weaken mechanical transmission caused by relative displacement between rigid structures, and therefore the purpose of protecting keel joints against damage is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas production equipment, and in particular to a keel node protection device, a keel node assembly, a top tensioning riser, an oil production platform and a keel node assembly design method. Background Art

[0002] In recent years, with the development of exploration and development technology, offshore oil and gas has gradually moved from shallow water to deep water, becoming an important growth pole in the energy consumption structure. As a bridge connecting the underwater production system and the platform, the riser often faces challenges brought by many environments such as waves, currents, and platform movements. Top tension riser is a more representative type of riser system, and the supporting production scheme is widely adopted on tension leg platforms or single column (SPAR) platforms. When used on site, both ends of the top tension riser are fixedly connected to the rigid structure, in a vertical tension state, and the flexibility is significantly weakened. When the platform rises and falls and deviates with the waves, the riser passing through the platform keel may be damaged due to the sudden increase in local force. In particular, considering the particularity of the dry tree platform and the top tension riser structure design, the stress peak often appears at the keel joint part where the top tension riser contacts the platform body, which can easily cause the top tension riser to be damaged. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a keel node protection device, a keel node assembly, a top tensioned riser, an oil production platform and a keel node assembly design method, aiming to solve the problem in the related art that the keel joint at the contact position between the top tensioned riser and the platform main body keel is subjected to large force and is easily damaged.

[0004] The present invention provides a keel node protection device, comprising: A mounting seat, the mounting seat is used to be sleeved on the outside of the smooth transition section of the keel node, and the keel node is used to connect between two adjacent production risers of the top tensioning riser; A plurality of supports, wherein the plurality of supports are distributed along the circumference of the mounting seat, and one end of each of the supports is connected to the mounting seat, and the other end of the support extends in a radial direction of the mounting seat away from the mounting seat; A plurality of elastic bodies are arranged one by one at one end of the plurality of supports away from the mounting seat.

[0005] According to the keel node protection device provided by the present invention, the elastic body is formed by alternately stacking metal plates and elastic gaskets, and the metal plates and the elastic gaskets are both perpendicular to the axis of the support.

[0006] According to the keel node protection device provided by the present invention, the side of the elastic body close to the support and the side away from the support are both metal plates.

[0007] According to the keel node protection device provided by the present invention, the material of the metal plate is a steel plate or a titanium alloy plate, and the material of the elastic gasket is rubber.

[0008] The present invention also provides a keel node assembly, comprising: A keel node, wherein the keel node includes a top tapered section, a smooth transition section and a bottom tapered section in sequence from the top to the bottom, the large end of the top tapered section and the large end of the bottom tapered section are respectively connected to the two ends of the smooth transition section, the outer diameter of the smooth transition section is constant, and the inner diameter of the keel node is constant; As described above, the keel node protection device, the mounting seat of the keel node protection device is arranged on the outer side of the smooth transition section of the keel node.

[0009] According to the keel node assembly provided by the present invention, the keel node is made of steel or titanium alloy.

[0010] According to the keel node assembly provided by the present invention, the keel node is integrally forged, or the top tapered section and the smooth transition section, as well as the smooth transition section and the bottom tapered section are welded together.

[0011] The present invention also provides a top tensioned riser, comprising a plurality of production riser singles and the keel node assembly as described above, wherein the keel node assembly is arranged between two of the production riser singles.

[0012] The present invention also provides an oil production platform, comprising a platform body and the top tensioned riser as described above, wherein the top of the top tensioned riser is passed through the keel of the platform body to the top of the platform body, and the smooth transition section of the keel node of the top tensioned riser corresponds to the position of the keel.

[0013] The present invention also provides a keel node assembly design method for designing the keel node assembly as described above, the design method comprising: Predict the maximum offset between the platform body and the top tensioned riser based on the platform body's motion characteristics and environmental parameters , based on the maximum offset Determine the maximum stress between the two , and preset safety factor ; Based on the maximum stress and the safety factor , determine the effective pressure-bearing area of ​​the elastic body as , satisfy , is the average compressive stress limit of the bearing during working period; The shear deformation caused by the external compression is assumed to be , determine the total thickness of the elastic gasket as , satisfy ; Based on the total thickness of the elastic gasket , determine the side length of the support or diameter When the cross section of the support is rectangular, the side length of the support satisfy When the cross section of the support is circular, the diameter of the support satisfy ; Based on the maximum stress , the safety factor a and the effective pressure bearing area of ​​the elastic body , determine the thickness of a single metal sheet , the thickness of the elastic gasket located on the upper layer of the metal plate and the thickness of the elastic gasket located under the metal plate , wherein the thickness of the single metal plate is , the thickness of the elastic gasket located on the upper layer of the metal plate , the thickness of the elastic gasket located under the metal plate ,and ; Get the inner diameter of a single production riser of a top tensioned riser and outer diameter , the effective offset distance of the keel of the oil production platform , and based on the inner diameter of the single production riser and outer diameter Determine the inner diameter of the keel node , the outer diameter of the connection between the keel node and the single production riser , based on the effective offset distance of the keel of the oil production platform Determine the length of the smooth transition section of the keel node ,in, , , ; Get the inner diameter of the keel of the platform body , and the length of the support is preset to be , based on the inner diameter of the keel of the platform body , the total thickness of the elastic gasket , the thickness of the single metal plate and the length of the support , determine the outer diameter of the smooth transition section of the keel node , the outer diameter of the smooth transition section of the keel node satisfy ; Based on the outer diameter of the connection between the keel node and the single production riser and the outer diameter of the smooth transition section of the keel node , determine the curvature of the connection between the keel node and the single production riser and the curvature of the end of the keel node smooth transition section , the curvature of the connection between the keel node and the single production riser and the curvature of the end of the keel node smooth transition section satisfy ; Check whether the keel node is damaged when the oil production platform rises, falls, deflects and rotates with the waves to generate the maximum stress peak. If the keel node is damaged, replace the design parameters and repeat the above steps until the keel node is no longer damaged.

[0014] The present invention adopts the above technical solution, which has the following advantages: The keel node protection device provided by the present invention includes a mounting seat, a plurality of supports and a plurality of elastomers. The mounting seat is used to be sleeved on the outside of the smooth transition section of the keel node, and the keel node is used to be connected between two adjacent production risers of the top tension riser. The plurality of supports are distributed along the circumference of the mounting seat, and one end of each support is connected to the mounting seat, and the other end of the support extends in a radial direction away from the mounting seat. The plurality of elastomers are arranged one by one at one end of the plurality of supports away from the mounting seat. When the platform body and the top tension riser collide with each other in relative motion, the elastomer will first contact the inner wall of the keel of the platform body, and the elastomer will weaken the mechanical transmission caused by the relative displacement between the rigid structures, thereby achieving the purpose of protecting the keel node from damage.

[0015] Furthermore, in the keel node assembly, top tensioned riser and oil production platform provided by the present invention, since they are all provided with the keel node protection device as described above, they have the same advantages as described above.

[0016] Furthermore, in the keel node protection assembly design method provided by the present invention, since it is used to set the keel node assembly as described above, the designed keel node assembly has the same advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a front view of a keel node assembly provided by an embodiment of the present invention; Figure 2 is a top view of a keel node assembly provided by an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0019] Reference numerals: 100: mounting seat; 200: support; 300: elastomer; 310: metal plate; 320: elastic gasket; 410: top conical section; 420: smooth transition section; 430: bottom conical section. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0026] The present invention provides a keel node protection device, wherein the keel node is used to connect between two adjacent production risers of a top tension riser, and the middle part of the keel node is a smooth transition section. The keel node protection device comprises a mounting seat, a plurality of supports and a plurality of elastic bodies, wherein the mounting seat is used to be sleeved on the outer side of the smooth transition section of the keel node, the plurality of supports are evenly distributed along the circumference of the smooth transition section of the keel node, and one end of each support is connected to the mounting seat, and the other end extends in a radial direction away from the mounting seat along the keel node. The plurality of elastic bodies are arranged one by one at one end of the plurality of supports away from the mounting seat. In the keel node protection device provided by the present invention, when the platform body and the top tension riser collide in relative motion, the elastic body will first contact the inner wall of the keel, and then transmit the force to the keel node through the support and the mounting seat. Due to the provision of the elastic body, compared with the hard collision between the two rigid structures of the keel node and the keel, the contact between the elastic body and the keel will weaken the mechanical transmission caused by the relative displacement between the rigid structures, thereby achieving the purpose of protecting the keel node from damage.

[0027] Combine the following Figures 1 to 3 The keel node protection device of the present invention is described.

[0028] An embodiment of the present invention provides a keel node protection device, including a mounting seat 100 , a plurality of supports 200 and a plurality of elastic bodies 300 .

[0029] The mounting seat 100 is used to be sleeved on the outer side of the smooth transition section 420 of the keel node, and the keel node is used to connect between two adjacent production risers of the top tensioning riser.

[0030] Specifically, the outer diameter of the smooth transition section 420 of the keel node remains constant along the axial direction. Therefore, the mounting seat 100 can be a cylindrical structure, and the inner diameter of the mounting seat 100 can be equal to the outer diameter of the smooth transition section 420 of the keel node. In this way, the mounting seat 100 can be mounted on the outer side of the smooth transition section 420 of the keel node.

[0031] A plurality of supports 200 are distributed along the circumference of the mounting seat 100 , and one end of each support 200 is connected to the mounting seat 100 , and the other end of the support 200 extends in a radial direction of the mounting seat 100 in a direction away from the mounting seat 100 .

[0032] Specifically, the support 200 may be a rod-shaped structure, and the cross section of the support 200 may be a square or a circle, and of course may be other shapes, such as a polygon such as a triangle, a pentagon, or an ellipse.

[0033] The plurality of supports 200 are evenly distributed along the circumference of the mounting seat 100. For example, six supports 200 may be provided, and two adjacent supports 200 are provided at an interval of 60 degrees. One end of the support 200 is connected to the mounting seat 100, for example, by welding, and the other end of the support 200 extends in a radial direction away from the mounting seat 100. Preferably, the axes of the plurality of supports 200 are located on the same plane, which is perpendicular to the axis of the mounting seat 100.

[0034] The plurality of elastic bodies 300 are disposed one by one at an end of the plurality of supports 200 away from the mounting base 100 .

[0035] Specifically, an elastic body 300 is disposed at one end of each support 200 away from the mounting seat 100 .

[0036] When the platform body rises and falls and shifts with the waves, the top tensioned riser passing through the keel of the platform body will bend or even collide and squeeze with the platform body. The stress peak often occurs at the keel node where the top tensioned riser contacts the keel of the platform body, which can easily lead to damage to the top tensioned riser.

[0037] At present, when the platform body and the top tensioned riser move relative to each other, a rigid collision and rigid extrusion will occur between the keel of the platform body and the keel node of the top tensioned riser. After the keel node protection device provided by the present invention is sleeved on the outside of the keel node, force is transmitted between the keel of the platform body and the keel node of the top tensioned riser through the protection device. Since the elastomer 300 is provided, the elastomer 300 will weaken the mechanical transmission caused by the relative displacement between the rigid structures, thereby achieving the purpose of protecting the keel node from damage.

[0038] In some embodiments of the present invention, the elastomer 300 is a laminated structure, which is formed by alternately stacking and vulcanizing a plurality of metal plates 310 and a plurality of elastic gaskets 320 .

[0039] Furthermore, the side of the elastic body 300 close to the support 200 and the side away from the support 200 are both metal plates 310 .

[0040] The side of the elastic body 300 close to the support 200 is a metal plate 310, which is convenient for welding the elastic body 300 to the support 200. Since the elastic body 300 needs to contact the keel of the platform body, in order to improve the wear resistance of the elastic body 300, the side of the elastic body 300 away from the support 200 is set as a metal plate 310.

[0041] The metal plate 310 may be made of a steel plate or a titanium alloy plate, and the elastic gasket 320 may be made of rubber.

[0042] An embodiment of the present invention further provides a keel node assembly, which includes a keel node and the keel node protection device as described above.

[0043] The keel node includes a top tapered section 410, a smooth transition section 420, and a bottom tapered section 430. The outer diameter of the smooth transition section 420 remains constant along the axial direction, that is, the outer peripheral surface of the smooth transition section 420 is a cylindrical surface. The large end of the top tapered section 410 is connected to the top end of the smooth transition section 420, and the large end of the bottom tapered section 430 is connected to the bottom end of the smooth transition section 420. The two ends of the keel node are connected, and its inner diameter remains constant along the axial direction.

[0044] In other words, the outer diameter of the keel node gradually increases from top to bottom, then remains constant, and then gradually decreases. The outer diameters at both ends of the keel node are equal. The channel inside the keel node runs through the top conical section 410, the smooth transition section 420 and the bottom conical section 430, and its inner diameter remains constant along the axial direction.

[0045] The top end and the bottom end of the keel node are respectively used to connect with the ends of two single production risers, which requires that the outer diameter of the end of the keel node is equal to the outer diameter of the single production riser, and the inner diameter of the keel node is equal to the inner diameter of the single production riser.

[0046] The keel node is spindle-shaped, and the outer diameter of the end connected to the single production riser is the same as the outer diameter of the single production riser. The outer diameter gradually increases toward the smooth transition section 420. The structure is simple and easy to forge, which improves the bending stiffness of the connection and reduces the bending stress. The wall thickness of the key part in the middle of the keel node is increased, so that the strength is optimized and can withstand greater local stress.

[0047] The mounting seat 100 of the keel node protection device is sleeved on the outside of the smooth transition section 420 of the keel node, and the elastic body 300 is used to weaken the mechanical transmission caused by the relative displacement between the rigid structures, so as to achieve the purpose of protecting the keel node from damage.

[0048] In some embodiments of the present invention, the keel node may be made of steel or titanium alloy, the keel node may be integrally forged, or the top conical section 410, the smooth transition section 420, and the bottom conical section 430 of the keel node may be connected by welding.

[0049] An embodiment of the present invention further provides a top-tensioned riser, which includes a plurality of production riser pipes and the above-mentioned keel node assembly, wherein the keel node assembly is arranged between two adjacent production riser pipes.

[0050] Since the keel node assembly as described above is provided, the same advantages as described above are obtained.

[0051] An embodiment of the present invention further provides an oil production platform, comprising a platform body and the above-mentioned top tensioned riser, wherein the top of the top tensioned riser is passed through the keel of the platform body to the top of the platform body, and is connected to the platform body through a tension system. When the top tensioned riser is connected to the platform body, the keel of the platform body and the keel node of the top tensioned riser are opposite to each other, that is, when the platform body and the top tensioned riser move relative to each other, the keel of the platform body can only contact the keel node.

[0052] Since the oil production platform includes the top tensioned riser provided with the above-mentioned keel node assembly, it has the same advantages as described above.

[0053] An embodiment of the present invention further provides a keel node assembly design method, the design method is used to design the keel node assembly as described above, the design method comprising the following steps: Step S100: predicting the maximum offset between the platform body and the top tensioned riser according to the movement characteristics of the platform body and environmental parameters , based on the maximum offset Determine the maximum stress between the two , and preset safety factor .

[0054] Specifically, the experimenter can predict the maximum offset between the platform body and the top tensioning riser based on the movement characteristics of the platform body and environmental parameters. For example, the maximum offset between the platform body and the top tensioned riser can be predicted based on the movement characteristics of the dry tree cylinder platform and the environmental parameters of the sea area. , then based on the maximum offset The maximum stress between the platform body and the top tensioned riser can be calculated , and give the experimental value of the preset safety factor based on experience .

[0055] Step S200: Based on the maximum stress and safety factor , determine the effective pressure bearing area of ​​the elastic body 300 as , satisfy , It is the average compressive stress limit of the bearing during 200 working periods.

[0056] Specifically, based on the maximum stress and safety factor , according to the formula Calculate the effective pressure bearing area of ​​the elastic body 300 The range of values ​​of and determine an experimental value from this range. It is the average compressive stress limit of the bearing during 200 working periods.

[0057] Step S300: Preset the shear deformation caused by external compression to be , determine the total thickness of the elastic gasket 320 as , satisfy .

[0058] Specifically, the experimenter can select an experimental value for the shear deformation caused by external compression , and according to the experimental value Determine the total thickness of the elastic gasket 320 of the elastic body 300 as range, satisfy The experimental value of the total thickness of the elastic gasket 320 is selected from this range as .

[0059] Step S400: Based on the total thickness of the elastic gasket 320 , determine the side length of support 200 or diameter When the cross section of the support 200 is a rectangle, the side length of the support 200 is satisfy When the cross section of the support 200 is circular, the diameter of the support 200 is satisfy .

[0060] Specifically, this step is based on the total thickness of the elastic gasket 320 Determine the side length of the cross section of the support 200 or diameter .

[0061] The cross section of the support 200 may be a square. In this case, the side length of the support 200 is Needs to be satisfied , the experimenter can determine the experimental value of the side length of a support 200 from this range .

[0062] Alternatively, the cross section of the support 200 may be circular. In this case, the diameter of the support 200 is Needs to be satisfied , the experimenter can determine the experimental value of the cross-sectional diameter of a support 200 from this range .

[0063] Step S500: Based on the maximum stress , safety factor a and effective pressure bearing area of ​​the elastic body 300 , determine the thickness of the single metal plate 310 , the thickness of the elastic gasket 320 located on the upper layer of the metal plate 310 and the thickness of the elastic gasket 320 located under the metal plate 310 , wherein the thickness of the single metal plate 310 is , the thickness of the elastic gasket 320 located on the upper layer of the metal plate 310 , the thickness of the elastic gasket 320 located under the metal plate 310 ,and .

[0064] Specifically, this step is based on the maximum stress , safety factor a and effective pressure bearing area of ​​the elastic body 300 Given the thickness of the single metal plate 310 , the thickness of the elastic gasket 320 located on the upper layer of the metal plate 310 and the thickness of the elastic gasket 320 located under the metal plate 310 The thickness of the single metal plate 310 is , the thickness of the elastic gasket 320 located on the upper layer of the metal plate 310 , the thickness of the elastic gasket 320 located under the metal plate 310 ,and The experimenter can determine the experimental value of the thickness of the single metal plate 310 from the above range as The experimental value of the thickness of the elastic gasket 320 located on the upper layer of the metal plate 310 is The experimental value of the thickness of the elastic gasket 320 located under the metal plate 310 is .

[0065] Step S600: Obtain the inner diameter of a single production riser of the top tensioned riser and outer diameter , the effective offset distance of the keel of the oil production platform , and based on the inner diameter of a single production riser and outer diameter Determine the inner diameter of the keel node , the outer diameter of the connection between the keel node and the single production riser , based on the effective offset distance of the keel of the oil production platform Determine the length of the keel node smooth transition section 420 ,in, , , .

[0066] Specifically, this step is used to calculate the size of the keel node. First, obtain the inner diameter of a single production riser of the top tensioning riser and outer diameter , determine the inner diameter of the keel node , the outer diameter of the connection between the keel node and the single production riser Then according to the effective distance of the keel of the oil production platform , and the length range of the keel node smooth transition section 420 is obtained and determine the experimental value of the length of a smooth transition section 420 from this range .

[0067] It should be noted that The purpose is to ensure that when the platform body rises and falls with the waves, the keel can only contact the smooth transition section 420 of the keel node and will not contact other positions of the keel node.

[0068] Step S700: Obtain the inner diameter of the keel of the platform body , and the length of the support 200 is preset to be , based on the inner diameter of the keel of the platform body , the total thickness of the elastic gasket 320 , the thickness of the single metal plate 310 and the length of the support 200 , determine the outer diameter of the smooth transition section 420 of the keel node , the outer diameter of the smooth transition section 420 of the keel node satisfy .

[0069] Specifically, this step is used to determine the outer diameter of the keel node smooth transition section 420 First, get the inner diameter of the keel of the platform body , and the length of the support 200 is preset to be , based on the inner diameter of the keel of the platform body , the total thickness of the elastic gasket 320 , the thickness of the single metal plate 310 and the length of the support 200 , determine the range of the outer diameter of the smooth transition section 420 of the keel node , and the experimental value of the outer diameter of the smooth transition section 420 of the keel node is determined within this range to be .

[0070] Step S800: Based on the outer diameter of the connection between the keel node and the single production riser and the outer diameter of the smooth transition section 420 of the keel node , determine the curvature of the connection between the keel node and the single production riser and the curvature of the end of the keel node smooth transition section 420 , the curvature of the connection between the keel node and the single production riser and the curvature of the end of the keel node smooth transition section 420 satisfy .

[0071] Specifically, this step is used to determine the outer diameter of the connection between the keel node and the single production riser. and the curvature of the end of the smooth transition section 420 of the keel node The end of the keel node and the single production riser are transitioned by rounded corners, and the top tapered section 410 and the smooth transition section 420 of the keel node and the bottom tapered section 430 and the smooth transition section 420 are also transitioned by rounded corners. and the curvature of the end of the keel node smooth transition section 420 All meet .

[0072] Step S900, check whether the keel node is damaged when the oil production platform rises and falls with waves and the offset base rotates to generate the maximum stress peak. If the keel node is damaged, replace the design parameters and repeat the above steps until the keel node is no longer damaged.

[0073] Specifically, this step is used to verify the selection of the above-mentioned experimental values. Software simulation is used to check whether the keel node is damaged when the oil production platform generates a maximum stress peak due to the rise and fall, displacement and rotation of the waves under the above-mentioned design parameters, that is, the above-mentioned experimental values. If the keel node is damaged, then the above-mentioned experimental values ​​are replaced and steps S100 to S800 are repeated again until the keel node is no longer damaged.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A keel node protection device, characterized in that: include: A mounting seat (100), the mounting seat (100) being used to be sleeved on the outside of a smooth transition section (420) of a keel node, the keel node being used to be connected between two adjacent production risers of a top tensioning riser; a plurality of supports (200), the plurality of supports (200) being distributed along the circumference of the mounting seat (100), one end of each of the supports (200) being connected to the mounting seat (100), and the other end of the supports (200) extending in a radial direction of the mounting seat (100) in a direction away from the mounting seat (100); A plurality of elastic bodies (300), wherein the plurality of elastic bodies (300) are arranged one by one correspondingly at one end of the plurality of supports (200) away from the mounting seat (100).

2. The keel node protection device according to claim 1, characterized in that: The elastic body (300) is formed by alternately stacking metal plates (310) and elastic gaskets (320), and the metal plates (310) and the elastic gaskets (320) are both perpendicular to the axis of the support (200).

3. The keel node protection device according to claim 2, characterized in that: The side of the elastic body (300) close to the support (200) and the side away from the support (200) are both metal plates (310).

4. The keel node protection device according to claim 2, characterized in that: The material of the metal plate (310) is a steel plate or a titanium alloy plate, and the material of the elastic gasket (320) is rubber.

5. A keel node assembly, characterized in that: include: A keel node, the keel node comprising, from top to bottom, a top conical section (410), a smooth transition section (420) and a bottom conical section (430), the large end of the top conical section (410) and the large end of the bottom conical section (430) being respectively connected to two ends of the smooth transition section (420), the outer diameter of the smooth transition section (420) being constant, and the inner diameter of the keel node being constant; The keel node protection device according to any one of claims 1 to 4, wherein the mounting seat (100) of the keel node protection device is sleeved on the outer side of the smooth transition section (420) of the keel node.

6. The keel node assembly according to claim 5, characterized in that: The material of the keel node is steel or titanium alloy.

7. The keel node assembly according to claim 5 or 6, characterized in that: The keel node is integrally forged, or the top tapered section (410) and the smooth transition section (420), and the smooth transition section (420) and the bottom tapered section (430) are connected by welding.

8. A top tensioned riser, characterized in that: It comprises a plurality of production risers and a keel node assembly as claimed in any one of claims 5 to 7, wherein the keel node assembly is arranged between two of the production risers.

9. An oil production platform, characterized in that: It comprises a platform body and a top tensioned riser as claimed in claim 8, wherein the top of the top tensioned riser is passed through the keel of the platform body to the top of the platform body, and the smooth transition section (420) of the keel node of the top tensioned riser corresponds to the position of the keel.

10. A keel node component design method, characterized in that: For designing the keel node assembly according to any one of claims 5 to 7, the design method comprises: Predict the maximum offset between the platform body and the top tensioned riser based on the platform body's motion characteristics and environmental parameters , based on the maximum offset Determine the maximum stress between the two , and preset safety factor ; Based on the maximum stress and the safety factor , determine the effective pressure bearing area of ​​the elastic body (300) as , satisfy , is the average compressive stress limit of the bearing (200) during the working period; The shear deformation caused by the external compression is assumed to be , determine the total thickness of the elastic gasket (320) as , satisfy ; Based on the total thickness of the elastic gasket (320) , determine the side length of the support (200) or diameter When the cross section of the support (200) is rectangular, the side length of the support (200) is satisfy When the cross section of the support (200) is circular, the diameter of the support (200) is satisfy ; Based on the maximum stress , the safety factor a and the effective pressure-bearing area of ​​the elastic body (300) , determine the thickness of the single metal plate (310) , the thickness of the elastic gasket (320) located on the upper layer of the metal plate (310) and the thickness of the elastic gasket (320) located under the metal plate (310) , wherein the thickness of the single metal plate (310) is , the thickness of the elastic gasket (320) located on the upper layer of the metal plate (310) , the thickness of the elastic gasket (320) located under the metal plate (310) ,and ; Get the inner diameter of a single production riser of a top tensioned riser and outer diameter , the effective offset distance of the keel of the oil production platform , and based on the inner diameter of the single production riser and outer diameter Determine the inner diameter of the keel node , the outer diameter of the connection between the keel node and the single production riser , based on the effective offset distance of the keel of the oil production platform Determine the length of the keel node smooth transition section (420) ,in, , , ; Get the inner diameter of the keel of the platform body , and the length of the support (200) is preset to be , based on the inner diameter of the keel of the platform body , the total thickness of the elastic gasket (320) , the thickness of the single metal plate (310) and the length of the support (200) , determine the outer diameter of the smooth transition section (420) of the keel node , the outer diameter of the smooth transition section (420) of the keel node satisfy ; Based on the outer diameter of the connection between the keel node and the single production riser and the outer diameter of the smooth transition section (420) of the keel node , determine the curvature of the connection between the keel node and the single production riser and the curvature of the end of the keel node smooth transition section (420) , the curvature of the connection between the keel node and the single production riser and the curvature of the end of the keel node smooth transition section (420) satisfy ; Check whether the keel node is damaged when the oil production platform rises, falls, deflects and rotates with the waves to generate the maximum stress peak. If the keel node is damaged, replace the design parameters and repeat the above steps until the keel node is no longer damaged.

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