本文選題：3NB1300型鉆井泵 + 泵閥��； 參考：《蘭州理工大學(xué)》2011年碩士論文

【摘要】：本論文以3NB1300型鉆井泵參數(shù)為依據(jù),以揭示鉆井泵泵閥在高壓流體——鉆井液中的運動規(guī)律以及泵閥的沖擊應(yīng)力分布情況,提高泵閥的使用壽命為目的,從泵閥的運動規(guī)律、關(guān)閉階段引起的沖擊應(yīng)力和微細(xì)閥隙流場對閥體的影響程度這三個主要方面出發(fā)進(jìn)行研究,對完善鉆井泵泵閥的設(shè)計、壽命預(yù)測以及泵閥的失效判定提供了理論方面的支持。本論文主要從以下幾個方面入手: (1)首先建立閥盤與閥座之間的三維實體模型,構(gòu)造出描述閥盤關(guān)閉階段的簡化模型,建立起泵閥動力學(xué)模型,對泵閥的運動特性進(jìn)行描述,利用Matlab繪制相應(yīng)的運動曲線。得到了相應(yīng)錐角下,閥盤運動特性的變化情況,為深入研究泵閥提供了理論依據(jù);同時構(gòu)造出泵閥沖擊過程中的有限元動力學(xué)分析模型,將得到的閥盤關(guān)閉階段初始時的速度、加速度作為初始條件或約束條件,完整地分析泵閥與閥座之間的沖擊特性;重點研究泵閥沖擊時產(chǎn)生的最大應(yīng)力集中部位的受力特征及其影響程度,提出一種能夠有效減緩應(yīng)力集中的結(jié)構(gòu)該井方案;同時利用最大應(yīng)力集中部位的最大應(yīng)力來對鉆井泵泵閥的壽命進(jìn)行預(yù)測,并得出相應(yīng)的循環(huán)極限應(yīng)力壽命曲線圖。 (2)利用復(fù)合形法對鉆井泵泵閥閥盤進(jìn)行了優(yōu)化設(shè)計。建立優(yōu)化模型的數(shù)學(xué)目標(biāo)函數(shù),通過復(fù)合形法對目標(biāo)函數(shù)和約束條件,同時結(jié)合有限元方法進(jìn)行計算,得出優(yōu)化設(shè)計的最優(yōu)值。 (3)采用流體力學(xué)方法,利用FULENT軟件對鉆井泵泵閥流場進(jìn)行仿真分析,得到符合實際的閥隙流場分布——壓力分布云圖和流速分布云圖,并對閥盤的影響作簡單的分析與認(rèn)識。
[Abstract]:Based on the parameters of 3NB1300 drilling pump, this paper reveals the movement law of drilling pump valve in high pressure fluid-drilling fluid, the distribution of impact stress of pump valve, and improves the service life of pump valve. The impact stress caused by the closing stage and the influence degree of the clearance field on the valve body are studied in order to provide theoretical support for improving the design of the drilling pump valve, the life prediction and the failure judgment of the pump valve. This paper mainly starts from the following aspects: (1) the three-dimensional solid model between the valve disc and the valve seat is established, and a simplified model describing the closing stage of the valve disc is constructed, and the dynamic model of the pump valve is established. The motion characteristic of pump valve is described and the corresponding motion curve is drawn by Matlab. The change of valve disc motion characteristics under the corresponding cone angle is obtained, which provides a theoretical basis for the further study of the pump valve. At the same time, the finite element dynamic analysis model of the pump valve during the impact process is constructed, and the velocity of the valve disc at the beginning of the closing stage is obtained. Acceleration as the initial condition or constraint condition, the impact characteristics between the pump valve and the valve seat are analyzed completely, and the stress characteristics and the influence degree of the maximum stress concentration during the impact of the pump valve are studied. This paper puts forward a structure which can reduce stress concentration effectively, and uses the maximum stress concentration to predict the life of drilling pump valve. The corresponding curve of cycle ultimate stress life is obtained. (2) the optimization design of drilling pump valve disc is carried out by using compound method. The mathematical objective function of the optimization model is established. The objective function and constraint conditions are calculated by the complex method, and the optimum value of the optimization design is obtained by combining the finite element method. (3) the hydrodynamic method is used. The flow field of drilling pump valve is simulated by using software FULENT, and the distribution of valve gap flow field, pressure distribution and velocity distribution are obtained, and the influence of valve disc is simply analyzed and understood.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH38

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本文編號：2088490