本文選題：非粘結(jié)柔性管 + 骨架層�。� 參考：《中國海洋大學(xué)》2015年碩士論文

【摘要】：非粘結(jié)柔性管是海洋油氣勘探開采中的重要裝備,是由金屬材料層和聚合物材料層以不粘結(jié)的形式組合形成,允許管道層與層之間發(fā)生相對滑動(dòng)。相對于其它形式的海洋管道,柔性管有更優(yōu)的結(jié)構(gòu)力學(xué)性能,更加適用于深海的油氣開發(fā)。當(dāng)今,海洋石油開發(fā)逐漸走向深海,海洋環(huán)境也越來越復(fù)雜,使得位于管道結(jié)構(gòu)最內(nèi)部的骨架層可能承受過大的靜水外壓,造成管體破裂,產(chǎn)生壓潰失效。在實(shí)際工程中,由于制造缺陷、張緊器作用等影響,管道的骨架層不可避免地存在初始橢圓度,難以達(dá)到完美圓狀態(tài),而骨架層主要由鋼材制成,其材料的非線性可能對其抗壓潰能力產(chǎn)生影響,同時(shí)骨架層相鄰表面之間的相對滑動(dòng)也會(huì)對柔性管結(jié)構(gòu)的強(qiáng)度產(chǎn)生一定的影響。但在現(xiàn)有的理論研究方法中通常假定骨架層相鄰表面間沒有相對滑動(dòng),并且忽略了初始橢圓度和材料非線性對壓潰失效特性的影響,使得研究結(jié)果應(yīng)用到實(shí)際工程時(shí)有一定的偏差。針對上述缺陷,本文首先介紹骨架層結(jié)構(gòu)形式和特點(diǎn),并對壓潰失效機(jī)理、行業(yè)設(shè)計(jì)規(guī)范中關(guān)于壓潰設(shè)計(jì)的要求以及非粘結(jié)柔性管壓潰的理論計(jì)算模型進(jìn)行了詳細(xì)總結(jié)。在此基礎(chǔ)上,基于有限元分析方法,分別采用三種接觸方式對8寸內(nèi)直徑骨架層進(jìn)行建模,對模型在完美圓狀態(tài)、存在初始橢圓度幾何缺陷狀態(tài)和考慮材料彈塑性狀態(tài)三種情況下的徑向位移值和臨界壓潰值進(jìn)行計(jì)算,并通過與理論計(jì)算結(jié)果的對比和討論,研究非粘結(jié)柔性管的壓潰行為,得到了相應(yīng)的結(jié)論,對非粘結(jié)柔性管道壓潰分析研究有一定的借鑒意義。
[Abstract]:Unbonded flexible pipe is an important equipment in offshore oil and gas exploration and exploitation. It is formed by the combination of metal material layer and polymer material layer in the form of unbonding, allowing relative sliding between pipeline layers and layers. Compared with other types of offshore pipelines, flexible pipes have better structural and mechanical properties and are more suitable for oil and gas exploitation in the deep sea. Nowadays, the offshore oil development is gradually moving to the deep sea, and the marine environment is becoming more and more complex, which makes the skeleton layer in the most inner part of the pipeline structure likely to bear excessive hydrostatic external pressure, resulting in the rupture of the pipe body and the collapse failure. In practical engineering, due to the influence of manufacturing defects and tensioning, the initial ellipticity of the skeleton layer of the pipeline is unavoidable, which is difficult to reach the perfect circle state, and the skeleton layer is mainly made of steel. The nonlinearity of the material may have an effect on the strength of the flexible tube structure, and the relative sliding between the adjacent surfaces of the skeleton layer will also affect the strength of the flexible tube structure. However, in the existing theoretical research methods, it is generally assumed that there is no relative sliding between adjacent surfaces of the skeleton layer, and the effects of initial ellipticity and material nonlinearity on the collapsing failure characteristics are ignored. It makes the research result have certain deviation when it is applied to the actual project. In view of the above defects, this paper first introduces the structure form and characteristics of skeleton layer, and summarizes the failure mechanism of crushing layer, the requirements of crushing design in industry design code and the theoretical calculation model of unbonded flexible pipe crashing. On this basis, based on the finite element analysis method, three kinds of contact methods are used to model the 8 inch inner diameter skeleton layer, and the model is in perfect circle state. The radial displacement value and critical collapse value are calculated under the condition of initial ellipticity geometric defect state and elastic-plastic state of material. The collapsing behavior of unbonded flexible pipe is studied by comparing and discussing with the theoretical calculation results. The corresponding conclusions are obtained, which can be used for reference in the analysis and research of non-bonded flexible pipeline collapse.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE95

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本文編號：2020898