空心球双密度钻井水下注入阀设计与分析

摘要

To address the HGS (hollow glass sphere) injection issue in HGS dual density drilling, an underwater injection valve based on hydrocyclone has been designed.The three-dimensional model of underwater injection valve and the whole injection system has been established by using SolidWorks.For the mechanical analysis of the injection valve, by using the RNG κ-ε model for the turbulence model and the Euler model equation for the solid-liquid two-phase flow, the mechanical model of the injection valve has been established.Fluent software has been used to simulate the separation effect when the carrier liquid is seawater and base liquid.The results show that the separation efficiency decreases with the volume fraction.The seawater separation efficiency is higher given the same conditions.High-efficiency separation of the HGS can be achieved by using the two-stage cyclones connected in series.The study results could promote the development of deepwater drilling technology in China.%针对空心球双密度钻井中空心球注入困难的问题,设计了基于水力旋流器原理的水下注入阀.采用SolidWorks软件建立了水下注入阀和注入系统三维模型.对注入阀进行力学分析时,湍流模型采用RNG κ-ε模型,固液两相流动采用欧拉模型方程描述,建立了注入阀力学模型,采用Fluent软件模拟计算携带液分别为海水和基液时的分离效果.计算结果表明:分离效率随着体积分数增加而降低,同等条件下海水分离效率较高,采用2级旋流器串联可实现空心球的高效分离,从而提高注入空心球浓度.研究结果对于推动我国深水钻井技术发展具有一定的促进作用.