Multiphase throttling characteristic analysis and structure optimization design of throttling valve in managed pressure drilling

带宽遏流 井口 节气门 多相流 压力降 压力控制 背压 欠平衡钻井 工程类 钻井液 机械 石油工程 流量(数学) 机械工程 钻探 气体压缩机 物理
作者
Zhi Zhang,Baojiang Sun,Zhiyuan Wang,Xiaojie Mu,Dalin Sun
出处
期刊:Energy [Elsevier BV]
卷期号:262: 125619-125619 被引量:21
标识
DOI:10.1016/j.energy.2022.125619
摘要

As the key equipment to achieve accurate control of wellhead pressure during managed pressure drilling, the throttle valve can ensure the bottom hole pressure accurately controllable during the migration of invading gas in the annulus. At present, most of the research focuses on the throttling characteristics of single-phase fluid, and the research on the pressure regulation characteristics of throttle valve under the condition of multiphase flow is still relatively weak. In this paper, the mathematical model and CFD model of multiphase flow in the throttle valve are established, and the multiphase throttling characteristics under different hydraulic parameters are studied. The rationality of the proposed model is verified by field full-scale experiments. The results show that throttling pressure drop shows a nonlinear trend with the opening, which is not conducive to field application. Furthermore, through the sensitivity analysis of the throttle characteristic curve under multiphase flow conditions, the geometric structure of the throttle valve core is optimized to realize the fine adjustment of the wellhead back pressure under multiphase flow conditions, which is of guiding significance for wellbore pressure control under gas invasion condition.
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