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作 者:何顺利[1] 栾国华[1] 杨志[2] 公玉娟[3] 申颍浩[1] 郭雪晶[1]
机构地区:[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]西南石油大学石油工程学院,四川成都610500 [3]西部钻探工程有限公司,甘肃玉门735211
出 处:《油气井测试》2010年第5期9-13,共5页Well Testing
基 金:国家科技重大专项子课题(2009ZX05009-004)"(特)低渗透油藏工程新理论与新方法"资助
摘 要:分析当前应用较为广泛的液滴模型,针对低压气井携液模型的缺点,结合气井积液实验,一定程度上揭示了气井携液的机理。分析认为,Coleman模型忽略了液滴变形对携液临界流量的影响,导致计算结果较真实的临界流量偏大;而李闽模型没能考虑椭球形液滴在井筒内翻转造成的能量损失,计算结果偏小。由实验结果可知,实测的携液临界流量处在Coleman模型与李闽模型之间,分析认为是由于液滴翻转带来的能量损失足以抵消液滴变形产生附加能量。根据液滴模型的基本原理,结合气井积液实验的结果,给出了低压气井携液模型以及计算公式,新模型中引入修正因子表征液滴翻转的影响,较真实的反应了气井携液的真实情况。新模型的计算结果与Coleman的实验数据进行比较,误差较小、预测精度较高、应用效果较好。Aiming at the shortcoming of the carrying fluid model for low energy gas wells,and combining liquid loading experiment,the mechanism of fluid-carrying in gas wells is discovered in a certain extent by analysis of bubble model common used recently.It showed that Coleman's model neglected the influence of deformation of the bubble to critical flow rate of fluid-carrying,so that the calculated critical flow rate is greater than actual one;and Li Min's model didn't take the energy loss due to turning upside down of the elliptical bubbles in wellbore into account,so that the calculated critical flow rate is a little bit too small.The results of experiment and analysis showed the measured critical flow rate of fluid-carrying was between those calculated from Coleman's model and Li Min's,and the energy loss caused by turning upside down can counteract the additional energy created by deformation of the bubble.Based on the basic principle of carrying fluid model and combining the result of liquid loading experiment,a new carrying fluid model for low pressure gas wells and a new formula are proposed,a modification factor is added in the new model to express the influence of turning upside down of the bubbles,and so description of real situation becomes better.Comparing the result calculated from the new model with Coleman's experiment data,the new model has less error,more accuracy in prediction and better application result.
关 键 词:低压气井 液滴模型 气井携液 临界流量 修正因子
分 类 号:TE375[石油与天然气工程—油气田开发工程]
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