【摘要】：深水鉆井隔水管法蘭作為水下管道連接中的一種重要裝備將直接影響海上鉆井船或平臺的穩(wěn)定性和安全性,而法蘭連接要保證管道、立管和其設(shè)備安全正常的運行,必須保證整體結(jié)構(gòu)的強(qiáng)度,連接處良好的密封性,以及能夠迅速并多次重復(fù)裝拆,但由于鉆井環(huán)境條件隨水深的增加變得更加復(fù)雜,隔水管法蘭受力狀態(tài)更加惡劣和復(fù)雜,其連接裝置的強(qiáng)度、穩(wěn)定性能否適應(yīng)深水鉆井的問題,在國內(nèi)也未進(jìn)行過系統(tǒng)的研究。因此,研究深水隔水管法蘭系統(tǒng)的安全性能,對于減少鉆井平臺上的安全生產(chǎn)事故,降低海洋鉆井工作帶來的巨大損失具有十分重要的意義。對隔水管法蘭系統(tǒng)安全性能的研究主要從其力學(xué)性能入手,以深水隔水管法蘭連接接頭為研究對象,通過預(yù)加載連接試驗、軸對稱拉伸試驗、水壓試驗,三個試驗研究隔水管接頭在不同預(yù)加載荷條件下的應(yīng)力水平及水壓試驗壓力條件下的密封與變形性能。因此,本文展開了一系列有限元模擬分析、試驗實測及綜合對比分析研究工作。首先,通過對法蘭試驗載荷作用位置的分析,綜合考慮法蘭的應(yīng)力水平以及焊接工藝,結(jié)合額定載荷拉伸試驗和水壓試驗的要求,根據(jù)API Spec 16R隔水管接頭試驗的要求,設(shè)計能同時滿足三個試驗要求的兩種試驗裝置,采用有限元模擬對試驗裝置Ⅰ和裝置Ⅱ的強(qiáng)度和穩(wěn)定性分別進(jìn)行校核。從裝置的應(yīng)力分布、制造工藝、制造成本等三個方面綜合對比兩種試驗裝置,得出兩種試驗裝置中能夠完成法蘭試驗工作的相對合適的試驗裝置結(jié)構(gòu)。其次,使用Solidworks建立隔水管法蘭連接接頭的三維模型,通過對法蘭和螺栓的應(yīng)力計算,采用ANSYS Workbench有限元模擬分析法蘭在預(yù)加載荷試驗、額定載荷拉伸試驗和水壓試驗條件下的應(yīng)力分布規(guī)律,并選擇應(yīng)力強(qiáng)度校核的截面位置,針對法蘭應(yīng)力較集中區(qū)域和法蘭壁厚變化區(qū)域選擇評定路徑,將不同路徑的法蘭線性化應(yīng)力結(jié)果和相應(yīng)許用應(yīng)力進(jìn)行比較校核。最后,通過預(yù)加載荷連接試驗、額定載荷拉伸試驗及水壓試驗三部分現(xiàn)場試驗測試,分析隔水管接頭在不同預(yù)加載荷條件下特定部位的應(yīng)力水平以及在水壓試驗壓力條件下的密封與變形性能。根據(jù)試驗實測結(jié)果與有限元模擬結(jié)果的對比分析,結(jié)合試驗實測情況,綜合考慮試驗與模擬中存在誤差的原因,得出模擬與試驗中存在相對差值偏大點的主要誤差來源。證明試驗所得數(shù)據(jù)分析結(jié)果與數(shù)值模擬分析結(jié)果具有良好的一致性,有限元模擬在隔水管法蘭試驗裝置下的計算過程可代替法蘭試驗,對其安全性能的研究具有實質(zhì)性意義,能夠為我國在深水隔水管法蘭系統(tǒng)的安全可靠性提供驗證性保證。
[Abstract]:As an important equipment in underwater pipeline connection, deep water drilling riser flange will directly affect the stability and safety of offshore drilling vessel or platform, and the flange connection should ensure the safe and normal operation of pipeline, riser and its equipment. It is necessary to ensure the strength of the whole structure, the good sealing of the joints, and the ability to install and disassemble quickly and repeatedly, but as the drilling environment conditions become more complex with the increase of water depth, the stress state of the riser flange is more severe and complex. Whether the strength and stability of the connection equipment can adapt to the problem of deep water drilling has not been systematically studied in China. Therefore, it is of great significance to study the safety performance of deep water riser flange system for reducing the safety accidents on drilling platform and reducing the huge loss caused by offshore drilling work. The research on safety performance of riser flange system is mainly based on its mechanical properties. The connection joint of deep water riser flange is taken as the research object, through preloading connection test, axisymmetric tensile test, water pressure test, Three tests were carried out to study the sealing and deformation properties of water-insulated pipe joints under different preloading conditions and under hydraulic pressure conditions. Therefore, a series of finite element simulation analysis, experimental measurement and comprehensive comparative analysis are carried out in this paper. First of all, by analyzing the load position of flange test, considering the stress level of flange and welding technology, combining the requirements of rated load tensile test and hydraulic test, according to the requirements of API Spec 16R water-proof pipe joint test, Two kinds of test devices which can meet three test requirements simultaneously were designed. The strength and stability of test apparatus I and II were checked by finite element simulation. In this paper, the stress distribution, manufacturing process and manufacturing cost of the two test devices are comprehensively compared, and a relatively suitable structure of the test device which can complete the flange test work is obtained. Secondly, the three-dimensional model of flange joint of riser is established by using Solidworks. Through the stress calculation of flange and bolt, ANSYS Workbench finite element simulation is used to analyze the pre-loading test of flange. Under the condition of rated load tensile test and hydraulic pressure test, the stress distribution law and the section position of stress intensity check are selected, and the evaluation path is chosen for the flange stress concentration area and flange wall thickness change area. The results of linearization stress of flange with different paths and the corresponding allowable stress are compared and checked. Finally, through the connection test of pre-loading, the tensile test of rated load and the test of hydraulic pressure, the field test is carried out. The stress levels of the pipe joints under different preloading conditions and the sealing and deformation properties of the joints under the pressure of hydraulic test are analyzed. According to the comparison and analysis between the experimental results and the finite element simulation results, combined with the experimental results, and considering the reasons for the errors in the experiment and the simulation, the main error sources of the relative difference between the simulation and the test are obtained. It is proved that the experimental data analysis results are in good agreement with the numerical simulation results. The calculation process of finite element simulation under the flange test device of riser can replace the flange test, and the study of its safety performance is of substantial significance. It can guarantee the safety and reliability of deep water riser flange system in our country.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE92

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