本文選題：膨脹螺紋接頭 + 膨脹錐�。� 參考：《西南石油大學》2015年碩士論文

【摘要】：膨脹套管技術已被應用于石油鉆采行業(yè)的完井與修井作業(yè)中。隨著膨脹套管應用井深的增加,現(xiàn)有的膨脹螺紋接頭已經不能滿足更為惡劣的作業(yè)工況,故分析研究膨脹螺紋接頭的力學特性,提高接頭性能對膨脹套管技術的廣泛應用具有重要意義。雖然國內外學者針對膨脹螺紋接頭的強度與密封性能做了大量研究,但大多集中在保證膨脹過程中的接頭的密封性能上,而忽略了膨脹后的螺紋連接情況,也并未考慮膨脹工具對接頭性能的影響。因此,本文通過分析螺紋接頭在膨脹過程中的力學特性以及幾何變形情況,提出了螺紋接頭性能的評價指標,把以數(shù)學規(guī)劃理論為基礎的數(shù)值優(yōu)化方法與有限元仿真分析相結合,利用參數(shù)化建模、近似模型和網格變形等技術,建立了螺紋接頭和膨脹錐結構的優(yōu)化流程,以數(shù)學過程代替人為經驗,控制螺紋接頭和膨脹錐的優(yōu)化方向,進一步提高螺紋接頭的性能。具體的分析優(yōu)化過程與方法如下： (1)建立了0139.7×10.54膨脹套管接頭的膨脹過程有限元模型,分析了膨脹過程中接頭的力學特性和變形情況,并確定了接頭性能指標與評價方法； (2)建立了螺紋接頭膨脹分析的參數(shù)化計算流程,利用正交試驗設計方法,對各螺紋接頭結構參數(shù)進行了靈敏度分析,得到接頭性能與接頭結構參數(shù)之問的關系,縮小了設計變量取值范圍,在此基礎上完成膨脹螺紋接頭幾何尺寸的多目標優(yōu)化,獲得了接頭的最優(yōu)尺寸組合方案； (3)通過膨脹錐結構參數(shù)靈敏度分析,確定了用于膨脹錐優(yōu)化的初始模型,并以膨脹錐邊界形狀作為優(yōu)化對象,利用網格變形技術和近似模型方法對膨脹錐進行形狀優(yōu)化,獲得了能顯著提高接頭性能的膨脹錐優(yōu)化方案。 本文的研究為提高膨脹套管螺紋接頭的性能提供了新的分析和優(yōu)化方法,有效地提高了接頭的膨脹性能,對膨脹螺紋接頭的優(yōu)化具有一定的參考意義。
[Abstract]:Expansion casing technology has been used in completion and workover of oil drilling and production industry. With the increase of the well depth of the expansion casing application, the existing expansion thread joints can no longer meet the worse working conditions, so the mechanical properties of the expansion thread joints are analyzed and studied. It is of great significance to improve the performance of joint for the extensive application of expansion casing technology. Although scholars at home and abroad have done a lot of research on the strength and sealing performance of the expansion thread joints, most of them are focused on ensuring the sealing performance of the joints in the process of expansion, while neglecting the thread connections after expansion. The effect of expansion tools on the performance of joints is also not taken into account. Therefore, based on the analysis of the mechanical properties and geometric deformation of the threaded joints during expansion, the evaluation indexes of the properties of the threaded joints are put forward in this paper. Combining the numerical optimization method based on mathematical programming theory with finite element simulation analysis, the optimization process of screw joint and expansion cone structure is established by using parameterized modeling, approximate model and mesh deformation techniques. The optimization direction of screw joint and expansion cone is controlled by mathematical process instead of artificial experience, and the performance of thread joint is further improved. The specific analysis and optimization process and methods are as follows: 1) the expansion process finite element model of 0139.7 脳 10. 54 expansion sleeve joint is established, the mechanical characteristics and deformation of the joint during expansion are analyzed, and the performance index and evaluation method of the joint are determined. The parametric calculation flow of screw joint expansion analysis is established. The sensitivity analysis of the structural parameters of each thread joint is carried out by using the orthogonal design method, and the relationship between the joint performance and the structural parameters of the joint is obtained. On the basis of reducing the range of design variables, the multi-objective optimization of the geometric dimension of the expansion thread joint is completed, and the optimal size combination scheme of the joint is obtained. Through the sensitivity analysis of the structural parameters of the expansion cone, the initial model for the expansion cone optimization is determined, and the shape of the expansion cone is optimized by using the mesh deformation technique and the approximate model method, taking the boundary shape of the expansion cone as the optimization object. The expansion cone optimization scheme which can significantly improve the joint performance is obtained. The research in this paper provides a new analysis and optimization method for improving the performance of the expansion casing thread joint, effectively improves the expansion performance of the joint, and has a certain reference significance for the optimization of the expansion thread joint.
【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】：TE931.2

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本文編號：1833520