本文選題：浮式平臺鉆機 + 前開口井架　； 參考：《西南石油大學》2015年碩士論文

【摘要】：與陸地鉆機井架相比,浮式平臺鉆機井架除了承受正常的工作載荷外,還會受到浮式平臺運動加速度引起慣性載荷、平臺升沉運動引起的鉆柱附加動載荷、平臺傾斜產生的重力的橫向分力以及海洋風載等,受力情況更加惡劣。目前,國內外均未制定海洋浮式平臺鉆機的設計標準,設計制造企業(yè)只能通過選擇較之陸地鉆機高一級別的構件來配套海洋浮式平臺用鉆機,其設計依據缺乏科學性。本文以南海某深水半潛式平臺的運動響應為依據,以與浮式平臺配套的K型動態(tài)海洋井架為研究對象,對其經歷的各種海況和工況進行穩(wěn)定性研究,為浮式平臺鉆井裝備的設計提供理論依據。 1)考慮平臺運動響應、海洋環(huán)境載荷以及鉆機工作載荷,對浮式平臺鉆機井架在各種海況和工況下的受力情況進行系統(tǒng)分析,為井架的穩(wěn)定性研究提供載荷條件。 2)井架為變截面格構式綴條梁柱,利用軸心受壓柱的臨界載荷等效,通過引入等效慣性矩,將變截面構件等效為同高度等截面構件；在此基礎上,計入綴條的剪切變形,通過引入等效抗彎剛度將井架等效為同高度的分段等截面實腹式梁柱,作為對穩(wěn)定性進行理論分析的模型。 3)利用能量法建立井架在復雜載荷作用下的平面內穩(wěn)定性分析模型,并通過有限元數值計算驗證了模型的有效性；通過對比各海況和工況下井架變形隨鉤載的變化趨勢,確定出井架失穩(wěn)的最不利工況,針對該工況說明井架在強度范圍內發(fā)生整體失穩(wěn)的可能性。 4)利用有限元軟件對井架在各種海況和工況條件下進行強度計算,其內力分布作為井架局部穩(wěn)定性和前大腿穩(wěn)定性的載荷條件；建立局部桿件和井架前大腿穩(wěn)定性分析的力學模型,通過屈曲分析研究其穩(wěn)定性儲備；通過對井架進行整體屈曲計算,確定其失穩(wěn)臨界載荷及對應的失穩(wěn)模態(tài)；從穩(wěn)定性的角度提出井架的優(yōu)化途徑。
[Abstract]:Compared with the ground rig Derrick, the floating platform Derrick Derrick not only bears the normal working load, but also receives the inertia load caused by the floating platform motion acceleration and the additional dynamic load of the drill string caused by the platform heave motion.The lateral force of gravity caused by the tilt of the platform and the wind load of the ocean are even worse.At present, there is no design standard for offshore floating platform drilling rig at home and abroad. The design and manufacture enterprises can only select the components which are one grade higher than the land drilling rig to complete the offshore floating platform drilling rig, and the design basis is lack of scientific.Based on the motion response of a deep-water semi-submersible platform in the South China Sea and taking the K type dynamic marine Derrick matching with the floating platform as the research object, this paper studies the stability of various sea conditions and working conditions experienced by the platform.It provides theoretical basis for the design of floating platform drilling equipment.1) considering the platform motion response, marine environment load and working load of drilling rig, the loading conditions of floating platform rig Derrick under various sea conditions and working conditions are analyzed systematically, which provides load conditions for the study of Derrick stability.2) the Derrick frame is composed of variable cross section lattice strands Liang Zhu. By introducing the equivalent moment of inertia, the variable section member is equivalent to the same height section member by using the critical load of the axial compression column, and on this basis, the shear deformation of the strip is taken into account.The equivalent flexural stiffness was introduced to make the Derrick equivalent to the segmented and equal section solid web Liang Zhu of the same height as the theoretical model for the stability analysis.3) the in-plane stability analysis model of Derrick under complex load is established by energy method, and the validity of the model is verified by finite element numerical calculation, and the variation trend of Derrick deformation with hook load is compared under different sea conditions and working conditions.The most unfavorable condition of Derrick instability is determined and the possibility of overall instability of Derrick in the range of strength is explained according to this condition.4) using finite element software to calculate the strength of the Derrick under various sea conditions and working conditions, and its internal force distribution is used as the load condition of the local stability of the Derrick and the stability of the front thigh.The mechanical model of the stability analysis of local members and Derrick front thighs is established, and the stability reserve is studied by buckling analysis, and the critical load and the corresponding instability modes of the Derrick are determined by the overall buckling calculation of the Derrick.The optimization method of Derrick is put forward from the point of view of stability.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE951

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