Rubber bearing for offshore drilling platform under working condition

Abstract

The utility model relates to rubber support technical field discloses a rubber support under the working condition of offshore drilling platform, including composite rubber body and the steel bottom plate of setting at the bottom of composite rubber body, the stainless steel framework is alternately overlapped and arranged in the composite rubber body, the stainless steel framework is overlapped and is composed by a plurality of thin steel sheets, the stainless steel framework is formed 10um ceramic membrane through micro -arc oxidation treatment, and fills the nanometer sealing agent in ceramic membrane, the composite rubber body includes the surface layer, the middle layer and the core layer that set up in proper order, the surface layer is made of hydrogenated nitrile rubber, the middle layer is made of fluorine rubber, and is connected through vulcanization bond with the surface layer, the core layer is made of high damping natural rubber, is closely combined with the middle layer through hot vulcanization process, and the whole forms co -vulcanization integrated structure.

Description

Technical Field

[0001] This utility model relates to the field of rubber bearing technology, specifically to a rubber bearing for offshore drilling platform operation. Background Technology

[0002] Offshore drilling platforms operate for extended periods in extreme marine environments, placing extremely high demands on the load-bearing capacity, corrosion resistance, vibration damping performance, and low-temperature resistance of their support structures. Existing rubber bearings primarily use neoprene rubber as the rubber body, with insufficient anti-corrosion treatment of the metal skeleton, resulting in several limitations: First, neoprene rubber is prone to aging and cracking in high-salt-spray and marine environments, with a salt spray life typically not exceeding 5 years, making it unsuitable for long-term offshore operations; second, neoprene rubber becomes brittle at low temperatures, with performance significantly declining below -20°C, making it unsuitable for polar drilling platforms or winter marine conditions; third, the traditional bearing metal skeleton has a high corrosion rate (approximately 0.5 mm / year), easily leading to rust damage over long-term use and affecting overall structural stability; furthermore, ordinary multi-layer rubber structures, using physical lamination, are prone to interlayer delamination, resulting in low damping performance and difficulty in effectively absorbing wave, drilling, and wind vibration energy.

[0003] In view of the above problems, this application proposes a rubber bearing for offshore drilling platforms that can maintain stable performance in marine environments with high salt spray, strong corrosion, and extreme temperature differences, while extending fatigue life and service life. This technical solution needs to consider the multi-layer co-vulcanization integrity of the rubber body, the high damping performance of the core layer, the composite protection of the metal skeleton, and the low-friction sliding interface design on the surface, thereby achieving long-term reliable support and vibration reduction functions for offshore drilling platforms. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a rubber bearing for offshore drilling platforms, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rubber support for offshore drilling platforms includes a composite rubber body and a steel base plate disposed at the bottom of the composite rubber body. A stainless steel skeleton is alternately stacked inside the composite rubber body. The stainless steel skeleton is composed of multiple thin steel plates stacked together. The stainless steel skeleton is subjected to micro-arc oxidation treatment to form a 10μm ceramic film, and the ceramic film is filled with a nano-sealing agent.

[0007] The composite rubber body comprises a surface layer, a middle layer, and a core layer sequentially coated thereon. The surface layer is made of hydrogenated nitrile rubber; the middle layer is made of fluororubber and is bonded to the surface layer by vulcanization; the core layer is made of high-damping natural rubber and is tightly bonded to the middle layer by a hot vulcanization process, forming a co-vulcanized integrated structure.

[0008] Optionally, the stainless steel skeleton surface is plasma-sprayed with a NiCrMo-625 nickel-based alloy layer.

[0009] Optionally, the NiCrMo-625 nickel-based alloy layer is 200 μm thick.

[0010] Optionally, a 0.2 mm thick PTFE microporous membrane with a friction coefficient μ ≤ 0.08 is molded onto the surface of the composite rubber body.

[0011] Optionally, some of the thin steel plates are forged from duplex stainless steel.

[0012] Optionally, the core layer loss factor is ≥0.3.

[0013] This utility model provides a rubber bearing for offshore drilling platforms, which has the following advantages:

[0014] 1. This utility model provides a rubber bearing for offshore drilling platforms. Through multiple designs including a composite rubber body, a high-damping core layer, a surface PTFE microporous membrane, and a stainless steel skeleton, the rubber bearing achieves high load-bearing capacity and excellent vibration reduction performance. It maintains stable elasticity under extreme temperature differences from -50℃ to 150℃. At the same time, the micro-arc oxidation ceramic membrane and nano-sealing agent effectively prevent marine corrosion, significantly extending the service life of the bearing. It is suitable for the high salt spray, strong corrosion, and strong vibration conditions of offshore drilling platforms, achieving a comprehensive improvement in durability, damping, and corrosion resistance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the composite rubber body structure of this utility model.

[0017] In the diagram: 1. Composite rubber body; 2. Base plate; 3. Stainless steel frame; 11. Surface layer; 12. Middle layer; 13. Core layer. Detailed Implementation

[0018] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "lateral", "longitudinal", "end", "edge", "sidewall", "upper", "lower", "upper part", "lower part", "directly above", "surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "end", "head", "tail", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] This application proposes a rubber bearing for offshore drilling platforms under operating conditions, as detailed below:

[0021] For reference Figure 1 This application mainly consists of two parts: a composite rubber body 1 and a steel base plate 2 set at the bottom of the composite rubber body 1. The structural design of this device achieves "high load-bearing capacity + high damping + resistance to high and low temperatures + resistance to marine corrosion + long service life", which is specially adapted to the working conditions of offshore drilling platforms with strong corrosion, strong power and extreme temperature difference.

[0022] For reference Figure 1 Stainless steel skeletons 3 are alternately stacked inside the composite rubber body 1. The stainless steel skeletons 3 are composed of multiple thin steel plates stacked together. The stainless steel skeletons 3 are forged from duplex stainless steel 2205 and have a NiCrMo-625 nickel-based alloy layer with a thickness of about 200μm plasma sprayed on their surface to improve the corrosion resistance and service life of the skeleton.

[0023] Furthermore, a PTFE microporous membrane with a thickness of approximately 0.2 mm is molded onto the surface of the composite rubber body, with a surface friction coefficient μ≤0.08, to provide a low-friction sliding interface when subjected to platform displacement or vibration.

[0024] Furthermore, using duplex stainless steel 2205 as the skeleton material can significantly improve the resistance to chloride pitting and stress corrosion cracking, making it suitable for marine high-salt spray and high-corrosion environments. By plasma spraying a NiCrMo-625 nickel-based alloy layer, a dense corrosion-resistant protective layer is formed on the skeleton surface, further reducing the corrosion rate of metal parts. The thin steel plate composite structure can effectively limit the excessive deformation of the rubber body while ensuring high load-bearing capacity, improving the overall stability and fatigue life of the bearing, thereby significantly extending the service life of the rubber bearing under extreme working conditions such as offshore drilling platforms.

[0025] For reference Figure 1The surface of the stainless steel skeleton 3 is subjected to micro-arc oxidation treatment to form a ceramic film with a thickness of about 10μm on its surface. The pores of the ceramic film are further filled with nano-scale sealing agent to obtain a dense and continuous composite protective layer.

[0026] Through the above design, the ceramic film provides an excellent wear-resistant and corrosion-resistant barrier for the stainless steel skeleton 3, while the nano-sealing agent effectively seals the micropores and microcracks in the micro-arc oxidation film, significantly reducing the penetration channels of chloride ions, salt spray, and water vapor. Compared with the traditional untreated steel skeleton, this composite protective layer effectively reduces the corrosion rate of the stainless steel skeleton 3 to below 0.002 mm / year, and effectively improves its corrosion resistance by approximately 250 times, while maintaining good bonding strength and service stability, thereby extending the overall service life of the rubber bearing. It is especially suitable for long-term applications in high-salt-spray and highly corrosive environments such as offshore drilling platforms.

[0027] For reference Figure 1 The composite rubber body 1 has a three-layer coating structure, which includes a surface layer 11, a middle layer 12 and a core layer 13 in sequence;

[0028] The outer layer 11 is made of hydrogenated nitrile rubber to resist the effects of oil and ozone. This hydrogenated nitrile rubber effectively resists corrosion from oil, ozone, and marine environments, delaying aging. The middle layer 12 is made of fluororubber and is firmly bonded to the outer layer 11 through vulcanization, improving its resistance to high and low temperatures. Furthermore, the use of fluororubber in the middle layer 12 ensures stable performance even under extreme temperature differences ranging from -40℃ to 150℃. The core layer 13 is made of high-damping natural rubber and is tightly bonded to the middle layer 12 through a hot vulcanization process. This co-vulcanization and cross-linking of the three rubber layers forms an integrated composite structure, avoiding the delamination and peeling problems common in traditional multi-layer rubber systems, ensuring long-term service stability.

[0029] Traditional neoprene rubber is prone to aging and cracking in marine salt spray environments, with a service life typically not exceeding 5 years. However, this invention, through the synergistic effect of the surface layer 11 and the middle layer 12, combined with the anti-corrosion treatment of the stainless steel frame 2, effectively extends the service life of the support to over 25 years. Traditional neoprene rubber becomes brittle below -20°C, making it unsuitable for polar operating conditions. However, the combination of the middle layer 12 and the core layer 13 in this invention maintains good elasticity and mechanical properties even at -50°C, making it suitable for polar drilling platforms.

[0030] Furthermore, the core layer 13 of this invention has a loss factor ≥0.3 and a damping ratio of up to 0.25, significantly improving its ability to absorb wave impact and drilling vibration, and increasing vibration reduction performance by approximately 400%. In contrast, the corrosion rate of metal parts in traditional neoprene bearings is approximately 0.5 mm / year, posing a risk of rust and damage with long-term use. This invention, through multiple protections including micro-arc oxidation, ceramic film, nano-sealing agent, and NiCrMo-625 nickel-based alloy layer, reduces the corrosion rate to 0.002 mm / year, improving corrosion resistance by approximately 250 times.

[0031] In this invention, the working steps of the device are as follows:

[0032] When using rubber bearings on offshore drilling platforms, the composite rubber body 1 is first fixed to the steel base plate 2 located at the bottom of the bearing to ensure that the bearing can withstand the platform load and provide stable support. The stainless steel skeleton 3 inside the composite rubber body 1 is composed of multiple layers of thin steel plates, and is formed by forging duplex stainless steel 2205 and plasma spraying a NiCrMo-625 nickel-based alloy layer to form a corrosion-resistant and wear-resistant skeleton structure, which can limit excessive deformation of the rubber body when the bearing is under load and improve overall stability.

[0033] The surface of the composite rubber body 1 is molded with a PTFE microporous membrane with a thickness of about 0.2 mm. When the platform undergoes horizontal displacement or vibration, this low-friction interface allows the composite rubber body 1 to slide controllably on the steel base plate 2, reducing local stress concentration and assisting the core layer 13 in absorbing vibration energy, thereby enhancing the vibration reduction effect.

[0034] During use, the micro-arc oxidation treatment of the stainless steel frame 3 forms a ceramic film of approximately 10 μm. The pores of the ceramic film are filled with a nano-sealing agent, thus providing a dense and continuous composite protective layer. This effectively prevents chloride ions, salt spray, and moisture from penetrating the interior of the frame, significantly reducing the corrosion rate of the metal parts. The integral combination of the thin steel plate laminate structure and the rubber body 1 enables the support to maintain high load-bearing capacity and good fatigue life under load and vibration.

[0035] The composite rubber body 1 is composed of a surface layer 11, a middle layer 12, and a core layer 13, which are sequentially coated. The hydrogenated nitrile rubber of the surface layer 11 can resist the corrosion of oils, ozone, and marine environment, and delay aging. The fluororubber of the middle layer 12 is tightly bonded to the surface layer 11 through vulcanization, which can ensure stable performance in a temperature range of -40℃ to 150℃. The high-damping natural rubber of the core layer 13 is cross-linked with the middle layer 12 through a hot vulcanization process to form an integrated composite structure with a damping ratio of up to 0.25 and a loss factor ≥0.3. It can absorb the energy of platform vibration and wave impact, and improve the vibration reduction performance by about 400%.

[0036] During operation, this rubber bearing achieves overall performance of "high load-bearing capacity, high damping, resistance to high and low temperatures, resistance to marine corrosion, and long service life" through the damping energy absorption of the composite rubber body 1, the low frictional slippage of the PTFE membrane, and the high load-bearing capacity and corrosion protection of the steel base plate 2 and stainless steel frame 3. It is suitable for use in long-term extreme working conditions of offshore drilling platforms.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rubber bearing for offshore drilling platform operation, characterized in that: It includes a composite rubber body (1) and a steel base plate (2) disposed at the bottom of the composite rubber body (1). Stainless steel skeletons (3) are alternately stacked inside the composite rubber body (1). The stainless steel skeletons (3) are composed of multiple thin steel plates stacked together. The stainless steel skeletons (3) are formed into a 10μm ceramic film by micro-arc oxidation treatment, and the ceramic film is filled with a nano-sealing agent. The composite rubber body (1) includes a surface layer (11), a middle layer (12) and a core layer (13) sequentially wrapped around it. The surface layer (11) is made of hydrogenated nitrile rubber. The middle layer (12) is made of fluororubber and is bonded to the surface layer (11) by vulcanization. The core layer (13) is made of high-damping natural rubber and is tightly bonded to the middle layer (12) by hot vulcanization process to form a co-vulcanized integrated structure.

2. The rubber bearing for offshore drilling platforms under operating conditions according to claim 1, characterized in that: The stainless steel skeleton (3) is plasma-sprayed with a NiCrMo-625 nickel-based alloy layer.

3. The rubber bearing for offshore drilling platforms under operating conditions according to claim 1, characterized in that: The composite rubber body (1) has a 0.2 mm thick PTFE microporous membrane molded on its surface, with a friction coefficient μ≤0.

08.

4. The rubber bearing for offshore drilling platforms under operating conditions according to claim 1, characterized in that: The thin steel plates are forged from duplex stainless steel.

5. The rubber bearing for offshore drilling platform operation as described in claim 2, characterized in that: The NiCrMo-625 nickel-based alloy layer is 200 μm thick.

6. The rubber bearing for offshore drilling platforms under operating conditions according to claim 1, characterized in that: The core layer (13) has a loss factor ≥ 0.3.

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