摘要
准确预测气井临界携液流量对于优化气井生产制度、延长气井生产寿命具有十分重要的意义。国内外学者通过对Turner公式中的临界携液系数进行修正,得到了不同的临界携液流量公式,但这些公式普遍忽略了表面张力和气体偏差系数随温度和压力的变化,以及不同临界携液系数对各气田的适用性。针对这2个问题,文中首先修正了临界携液流量公式中表面张力及气体偏差系数的取值方法,并对将其取作常数的误差进行了分析;然后提出了一种利用流温流压梯度测试资料计算各井段天然气参数,并在此基础上反推临界携液系数的方法,利用该方法即可得到适用于不同气田的临界携液系数及临界携液流量公式。实例计算验证表明,改进后的临界携液流量计算方法较常规方法具有更高的准确性。
The critical liquid carrying flow rate is very important for the production of gas wells. Domestic and foreign scholars have corrected the coefficient of Turner＇s formula and obtained different formulas for calculating the critical rate. But the calculating error caused by constant surface tension and gas deviation coefficient is ignored and the adaptabilities of liquid carrying coefficients for different gas field are not considered in these formulas. So there are obvious errors in practical calculation with these formulas. At first, the error caused by constant surface tension and gas deviation coefficient is analyzed and eliminated. Secondly an improved method of obtaining liquid carrying coefficient with the gradient data of flowing pressure and temperature is given to acquire applicable critical rate formulas for various gas fields. The results of case studies show that the method proposed in this paper is more reliable and accurate than conventional ones.
作者
郭布民
敬季昀
王杏尊
GUO Bumin;JING Jiyun;WANG Xingzun(Production Optimization R＆D Institute,COSL,Tianjin 300459,Chin)
出处
《断块油气田》
CAS
北大核心
2018年第4期484-487,共4页
Fault-Block Oil & Gas Field
关键词
临界携液流量
表面张力
临界携液系数
流温流压梯度
critical liquid-carrying flow rate
surface tension
critical liquid-carrying coefficient
gradient test of flowing pressure and temperature
