3NB1300型钻井泵泵阀的研究

发布时间：2018-07-01 17:14

本文选题：3NB1300型钻井泵 + 泵阀　；参考：《兰州理工大学》2011年硕士论文

【摘要】：本论文以3NB1300型钻井泵参数为依据,以揭示钻井泵泵阀在高压流体——钻井液中的运动规律以及泵阀的冲击应力分布情况,提高泵阀的使用寿命为目的,从泵阀的运动规律、关闭阶段引起的冲击应力和微细阀隙流场对阀体的影响程度这三个主要方面出发进行研究,对完善钻井泵泵阀的设计、寿命预测以及泵阀的失效判定提供了理论方面的支持。本论文主要从以下几个方面入手: (1)首先建立阀盘与阀座之间的三维实体模型,构造出描述阀盘关闭阶段的简化模型,建立起泵阀动力学模型,对泵阀的运动特性进行描述,利用Matlab绘制相应的运动曲线。得到了相应锥角下,阀盘运动特性的变化情况,为深入研究泵阀提供了理论依据;同时构造出泵阀冲击过程中的有限元动力学分析模型,将得到的阀盘关闭阶段初始时的速度、加速度作为初始条件或约束条件,完整地分析泵阀与阀座之间的冲击特性;重点研究泵阀冲击时产生的最大应力集中部位的受力特征及其影响程度,提出一种能够有效减缓应力集中的结构该井方案;同时利用最大应力集中部位的最大应力来对钻井泵泵阀的寿命进行预测,并得出相应的循环极限应力寿命曲线图。 (2)利用复合形法对钻井泵泵阀阀盘进行了优化设计。建立优化模型的数学目标函数,通过复合形法对目标函数和约束条件,同时结合有限元方法进行计算,得出优化设计的最优值。 (3)采用流体力学方法,利用FULENT软件对钻井泵泵阀流场进行仿真分析,得到符合实际的阀隙流场分布——压力分布云图和流速分布云图,并对阀盘的影响作简单的分析与认识。
[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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH38

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