摘要
涡流工具排液是一种新型气井排水采气工艺,从其作用原理上得出,涡流发生器外径和井筒的间隙越小涡流发生效果越好,可以大幅度减少气体的非涡流能量损失,而对于涡流工具与井筒不存在间隙的工况,现阶段国内外缺乏深入理论研究。为此,通过有限元分析方法建立涡流工具气液两相螺旋流动的数值模型,并借助CFD软件对其流动过程进行动态仿真,对流体流动规律进行分析,全面分析有无间隙工况下涡流工具排水采气携液能力,为井下涡流工具结构设计及优化提供参考。研究结果表明:变速器直径与翼高组合分别为52 mm和5 mm时,涡流工具无间隙工况排液效果最佳,涡流工具更易引发高速螺旋涡流,降低气液流动阻力;出口端处液体轴向速度提高8.3%,对增强气流的携液能力有着显著作用。
Water drainage using eddy current tools is a new technology for drainage gas production. From its principle, the smaller the space between external diameter of eddy current generator and wellbore is, the better the eddy current effect is, as a result of minimizing the energy loss of non-eddy current from gas. So far, scholars at home and aboard have not implemented a deeper theoretical study on this space. So, based on finite element analysis, we established a numerical model of gas-liquid two-phase flow in these tools; and then with the help of CFD software, simulated and analyzed the flowing process and rule; at last carried out a general analysis on the liquid-carrying capability by the tools with or without the space. Results show that(1) a combination of both transmission diameter of 52 mm and limb high of 5 mm should bring about the best drainage effect under one situation without the space, in which the tools may easily cause spiral current with high speed to reduce gas-liquid flow resistance; and(2) for the liquid at the outlet, the axial-speed may increase by 8.3 %, which has an obvious effect on improving the liquid-carrying capability.
出处
《天然气技术与经济》
2018年第2期48-50,共3页
Natural Gas Technology and Economy
关键词
井下涡流工具
数值模拟
排水采气
气井积液
downhole eddy current tool
numerical simulation
drainage gas recovery
liquid of gas wells
