新疆石油地质

›› 2016, Vol. 37 ›› Issue (5): 1-1.doi: 10.7657/XJPG20160511

• 论文 •    

体积绝热指数对嘴流流量计算的影响

王发清，杨淑珍，曹献平，陈德非，秦汉   

  1. (中国石油 塔里木油田分公司 油气工程研究院,新疆 库尔勒 841000)
  • 出版日期:2019-01-01 发布日期:1905-07-16

Impact of Volumetric Adiabatic Exponent on Calculation of Choke Flow Rate

WANG Faqing, YANG Shuzhen, CAO Xianping, CHEN Defei, QIN Han   

  1. (Research Institute of Petroleum Engineering, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China)
  • Online:2019-01-01 Published:1905-07-16

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摘要： 油气田生产上常需计算嘴流流量，其计算方程中的体积绝热指数通常用常数1.3. 事实上，嘴流流量计算应使用以温度和压力为函数的体积绝热指数，只有在低压时才能看作是常数。通过分析温度和压力对体积绝热指数的影响认为，当入口压力小于10 MPa时，体积绝热指数可以看作常数；当入口压力大于10 MPa 且出口与入口压力比小于0.9时，比热比与体积绝热指数相差较大，不能代替体积绝热指数；相同温度和压力下，同一尺寸油嘴的干气嘴流流量大于凝析气，且凝析油含量越高，凝析气流量越低。

Abstract: Choke flow rate is often needed to be calculated during oil and gas field production and the volumetric adiabatic exponent used as a constant in the calculation is often assumed to be 1.3. In fact, the volumetric adiabatic exponent as a function of temperature and pressure should be used for choke flow rate calculation, and the exponent can be considered as a constant only under the conditions of low pressure. Based on the analysis of the impact of temperature and pressure on the exponent, it is concluded that the volumetric adiabatic exponent can be considered as a constant when the inlet pressure is lower than 10 MPa. When the inlet pressure is more than 10 MPa and outlet to inlet pressure ratio is less than 0.9, there is a big difference between the specific heat ratio and the volumetric adiabatic exponent, so the specific ratio can’t substitute the exponent. Under the same pressure and temperature, dry gas flow rate is larger than condensate gas flow rate from chokes of same size. The higher the condensate content is, the lower the gas flow rate will be

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