注汽油井蒸气汽液比的折射率法测量研究

给油田的油井中注入高温高压蒸气时，从井口到井底连续地查明汽液比对节省能源和提高产出率意义重大。由于干蒸气和水的折射率不同，汽液的比例可以从汽液两相流的折射率响应特性反映出来。研制的测量装置采用蓝宝石作为折射率敏感的探测头，直接对汽液两相流的比例变化产生响应，能够应用于高温高压及狭窄工作空间的输汽环境中。装置在锅炉输汽管道中的实测响应曲线反映了输汽过程中汽液比的真实变化。该装置还在井深800m，井口蒸气温度270℃、压力10Mpa的油田注汽井中进行测量，测得的结果对注汽法采油的井况分析具有一定的作用。

Vapor-to-Water Ratio Measurement in Steam Injection Oil Well by Refractive Index Method

During injecting high temperature and pressure steam into an oil well, it is important to economize energy and raise yield if the vapor-to-water ratio continuously from the mouth to the bottom of the oil well is known. Because the vapor and water have different refractive indexes, the vapor-to-water ratio can be deduced from the response characteristic of refractive index of two-phase flow. The developed device, which adopts sapphire as the probe, can respond to the change of vapor-to-water ratio directly, and can be used in small working space in the steam with high temperature and pressure. The response curve gained by the test in a boiler pipe is accordant with the real situation of vapor-water ratio of the steam transportation. The device also works in a steam injection oil well with depth of 800 m, temperature of 270 ℃ and pressure of 10 MPa at well mouth. The experimental result is helpful to analyze the information of steam injection well of oilfield.