摘要
针对目前双梯度钻井中分离器的分离效率低的技术难题,设计了能够对空心球实现高效分离的过滤分离器。对过滤分离器的结构以及工作原理进行了介绍,基于分离器的结构,建立了工具的物理模型,依据给定的边界条件对其进行了强度校核,验证了工具的可靠性。根据工具的内部流场结构,建立了流体域物理模型,并结合多孔介质模型和欧拉多相流模型对分离器内部流场以及分离效率进行了研究,通过室内试验对分离效率进行了进一步的验证。验证结果表明,过滤分离器能够对空心球实现高效分离,其中最高分离效率可以达到98%,且过滤分离器的强度也满足安全需求。该研究突破了分离器分离效率不高的技术瓶颈,显著提升了注空心球双梯度钻井方式的可行性。
Aiming at the current technical problem of low separation efficiency of separator for dual gradient drilling,a filter separator that can achieve high-efficiency separation of hollow spheres is designed.The structure and working principle of the filter separator are introduced.Based on the structure of the separator,a physical model of the tool is established.The stress is checked according to the given boundary conditions,which verifies the reliability of the tool.According to the internal flow field structure of the tool,a physical model of the fluid domain is established.Combined with the porous media model and the Euler multiphase flow model,the internal flow field and separation efficiency of the separator are studied.The separation efficiency is further investigated through laboratory experiments.The results show that the filter separator can achieve high-efficiency separation of hollow spheres.The highest separation efficiency can reach 98%,and the strength of the filter separator also meets the safety requirements.The research broke through the technical bottleneck of the low separation efficiency of the separator,and significantly improved the feasibility and application prospects of the dual gradient drilling by injecting hollow spheres.
作者
张锐尧
明瑞卿
李军
柳贡慧
Zhang Ruiyao;Ming Ruiqing;Li JunLiu;Gonghui(China University of Petroleum(Beijing);Research Institute qf Petroleum Exploration&Development,CNPC;Beijing University of Technology)
出处
《石油机械》
北大核心
2021年第3期1-8,共8页
China Petroleum Machinery
基金
国家自然科学基金项目“深水油气钻探生产中井筒压力控制基础研究”(51734010)的部分研究成果。
关键词
过滤分离器
多孔介质
双梯度钻井
强度校核
分离效率
数值模拟
filter separator
porous media
dual gradient drilling
stress check
separation efficiency
numerical simulation
