本文選題：活動(dòng)式節(jié)流器 + 有限元��； 參考：《西安石油大學(xué)》2015年碩士論文

【摘要】：井下節(jié)流技術(shù)作為油氣田大規(guī)模、低成本開發(fā)過程中的一項(xiàng)新技術(shù),有利于解決油氣井生產(chǎn)過程中井筒及地面的諸多技術(shù)難題。現(xiàn)場(chǎng)應(yīng)用最多的是2 7/8″活動(dòng)式井下節(jié)流器,從設(shè)計(jì)角度而言,該井下節(jié)流器可根據(jù)需要坐封在任意深度,不易發(fā)生竄動(dòng)且能達(dá)到密封效果。但在實(shí)際使用過程中由于井下壓力較高,節(jié)流器卡瓦與油管間的錨定力非常大,同時(shí)還存在密封膠筒超彈性材料與油管之間的摩擦問題,由此引起的事故也頻頻發(fā)生。因此本文以2 7/8″活動(dòng)式井下節(jié)流器為對(duì)象,將公理設(shè)計(jì)理論與有限元方法相結(jié)合,對(duì)該節(jié)流器核心部件卡定機(jī)構(gòu)與密封機(jī)構(gòu)進(jìn)行優(yōu)化設(shè)計(jì)過程建模、接觸應(yīng)力分布規(guī)律分析和結(jié)構(gòu)優(yōu)化,主要研究內(nèi)容包括:(1)對(duì)活動(dòng)式井下節(jié)流器結(jié)構(gòu)特征、工作原理進(jìn)行了分析,研究了卡定機(jī)構(gòu)與油管彈塑性接觸有限元理論以及密封膠筒超彈性材料與油管非線性接觸問題。(2)采用公理設(shè)計(jì)理論與方法,對(duì)卡定機(jī)構(gòu)與密封膠筒機(jī)構(gòu)的優(yōu)化設(shè)計(jì)過程進(jìn)行了統(tǒng)一建模,從而有效支持優(yōu)化設(shè)計(jì)過程關(guān)鍵節(jié)點(diǎn)控制及知識(shí)獲取。(3)在公理設(shè)計(jì)框架下,建立了卡定系統(tǒng)有限元模型,分析了卡瓦厚度、牙型角等重要參數(shù)對(duì)接觸應(yīng)力的影響規(guī)律,以有效降低接觸應(yīng)力為目標(biāo),通過參數(shù)優(yōu)化確定了最優(yōu)結(jié)構(gòu)方案。(4)以公理化優(yōu)化設(shè)計(jì)方法為指導(dǎo),建立了密封膠筒超彈性材料有限元接觸模型,研究了膠筒長度、材料、摩擦系數(shù)等重要參數(shù)對(duì)接觸應(yīng)力的影響規(guī)律,通過參數(shù)優(yōu)化進(jìn)行了密封機(jī)構(gòu)的優(yōu)化設(shè)計(jì)。本文為活動(dòng)式節(jié)流器結(jié)構(gòu)優(yōu)化、性能分析及新型節(jié)流器研發(fā)提供了理論依據(jù)和借鑒。
[Abstract]:Downhole throttling technology, as a new technology in the large-scale and low-cost development of oil and gas fields, is helpful to solve many technical problems of wellbore and surface in the production process of oil and gas wells. The most widely used downhole throttle in the field is 27 / 8 "movable downhole throttle. From the design point of view, the downhole throttle can be sealed at any depth according to the need, so it is not easy to move and can achieve sealing effect. However, due to the high downhole pressure, the anchoring force between the throttle slips and the tubing is very large, and there is the friction problem between the sealant tube super-elastic material and the tubing at the same time, the accidents caused by it occur frequently. Therefore, this paper takes 27 / 8 "movable downhole throttle as an object, combines axiomatic design theory with finite element method, and models the optimal design process of the clamping mechanism and sealing mechanism of the core component of the throttle. The distribution law of contact stress and structure optimization are analyzed. The main research contents include: 1) the structure characteristics and working principle of movable downhole throttle are analyzed. The finite element theory of elastic-plastic contact between the clamping mechanism and tubing and the nonlinear contact problem of sealant tube super-elastic material with tubing are studied. The axiomatic design theory and method are adopted. The optimization design process of the clamping mechanism and the sealing cylinder mechanism is modeled in a unified way, which effectively supports the key node control and knowledge acquisition in the optimization design process. In the framework of axiomatic design, the finite element model of the clamping system is established. The influence of the important parameters such as slip thickness and tooth shape angle on contact stress is analyzed. With the aim of reducing contact stress effectively, the optimal structure scheme is determined through parameter optimization. The axiomatic optimal design method is used as the guide. The finite element contact model of sealant cylinder is established, and the influence of important parameters such as length, material and friction coefficient on contact stress is studied. The optimum design of sealing mechanism is carried out through parameter optimization. This paper provides a theoretical basis and reference for the structure optimization, performance analysis and research and development of a new type of throttle.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE931.2

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