气井涡流工具作用效果分析与临界携液流量实验研究

An Experimental Study on the Effect of the Vortex Tool and Its Influence on Critical Velocity

针对目前涡流工具排水采气工艺设计理论缺乏、现场应用主要凭经验等问题,基于相似理论,建立了气井生产模拟实验装置,实验研究了涡流工具的作用机理,评价了其应用效果,分析了气井井筒中加装涡流工具后对井筒内流体的流型、气体携液量、井筒内压降以及临界携液流量的影响。实验表明,气井井筒加装涡流工具后能够有效提高气井的携液能力,相同气量下平均提高携液量23%,平均降低井筒内流体压降18%,降低临界携液流量20%;通过涡流工具携液机理分析,并与实验结果进行对比验证,提出能够有效应用于涡流工具生产过程的临界携液流量计算公式,为涡流工具有效解决气井积液提供技术支持。

To solve the problem of the experience and theory support for vortex tool′s application in gas fields,an experiment was carried out to examine the influence of the tool on flow regime,liquid loading,pressure drop and critical velocity along the wellbore and to acquire the mechanism of the vortex tool by the equipment which was built to stimulate the gas production.Experiments show that the tool can effectively increase 23%lifted liquid with the same gas rate,decrease 18% pressure drop within the wellbore and decrease 20%critical gas rate.According to the mechanism analysis of the tool,a calculating model was quoted to estimate the critical velocity with vortex tool and validated by the experiment.The study provides a technical support for the use of the tool in field and guides production.