Experimental Research for Parameter Optimization of the Vortex Tool for Drainage Gas Recovery
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摘要: 目前对涡流排液采气的机理认识不清，且鲜有分析涡流工具结构参数对排液效果的影响方面的研究报道，无法有效指导现场应用。为此，基于相似原理建立了涡流排液采气物理模拟实验装置，测试了安装不同涡流工具后的井筒压降和流量，分析了涡流工具螺旋流道宽度、流道两侧密封性和螺旋角对排液效果的影响；选取了排液最优的涡流工具并测试了临界携液流量；同时，根据两相流体动力学理论建立了最优螺旋角理论模型。实验发现：涡流工具螺旋流道两侧有效密封、并在井筒压降较小的前提下，缩小螺旋流道的流动截面可以提高涡流工具的排液效果；实验最优螺旋角为45°，与理论模型计算结果吻合较好；使用优化后的涡流工具井筒压降降幅约为9.6%，排液量约提高12.4%，临界携液流量约降低20%。研究结果表明，优化后的涡流工具增强了排液能力，最优螺旋角理论模型结果可靠，可为涡流工具设计和现场应用提供理论指导。Abstract: Mechanistic studies of vortex drainage gas recovery are insufficient and cannot effectively create guidelines for field application.What is lacking is an analysis that aims to research the influence of the structure parameters of the vortex tool on the drainage effect.Therefore,based on the theory of similarity,physical simulation experiments were designed and the experimental facilities were set up.Then impact of installing the vortex tool were examines,namely the wellbore pressure drop and the flow rate curves.Later,the influences of helical flow channel scale,sealing on both sides of flow channel and helix angle of vortex tool on the drainage effect were analyzed.It was possible then to determine the critical flow rate after installing the optimized vortex tool.The theoretical model for calculating the optimal helical angle was established based on the two-phase fluid dynamic theory.The experiment showed that the drainage effect of vortex tools could be improve while enhancing the leak-tightness and decreasing the size of the flow channel under the conditions of low wellbore pressure drop.The experimental optimal helix angle was 45°,which was in good agreement with the results of the theoretical model;after installing the optimized vortex tool,the wellbore pressure drop would decrease by about 9.6%,the liquid flow rate would increase by about 12.4%,and the critical flow rate would decrease by about 20%.The optimized vortex tool enhanced the drainage capability and the results of optimal theoretical model for helix angle were reliable,thus providing theoretical guidance for design and field application of the vortex tool.
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Keywords:
- gas well /
- drainage /
- gas recovery /
- vortex tool /
- wellbore pressure drop /
- critical flow rate /
- helix angle
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