Abstract: In addition to the light oil which is easy to be exploited, there are many heavy oil which can not be directly exploited in the underground oil reservoir. The heavy oil reservoir is usually exploited by means of steam injection and thermal recovery. Steam dryness is an important parameter to measure the quality of wet saturated steam in heavy oil thermal recovery process, which has an important impact on the efficiency of heavy oil thermal recovery. In this paper, a new method of measuring the dryness of wet saturated steam in steam injection pipeline matrix conductance method was proposed. Based on this method, combining the thermodynamic properties of water and steam, an algorithm model of matrix conductance method for measuring the dryness of wet saturated steam was established. The causes of measurement errors and the methods to reduce the errors were analyzed. The calculation of the edge area of the instantaneous cross⁃section water area under the matrix was interpolated. Finally, the absolute error of the algorithm model was less than ±3.0%. This study also provided a reliable method for real⁃time monitoring of steam dryness, which was of great significance for improving the efficiency of heavy oil thermal recovery.

Key words: Matrix conductance method, Wet saturated steam, Steam dryness, Measurement error

摘要： 在地下石油矿储中，除了较易开采的轻质油，还有许多不能直接开采的稠油，稠油油藏常用注汽热采的方式进行开采。蒸汽干度是稠油热采工艺中衡量湿饱和蒸汽品质的重要参数，对稠油热采效率有重要影响。提出了一种新的注汽管道内湿饱和蒸汽干度测量方法——矩阵电导法，并在此基础上结合水和蒸汽的热力学性质，建立了矩阵电导法测量湿饱和蒸汽干度的算法模型。分析了测量误差产生的原因以及减小误差的方法，并对矩阵下瞬时截面水域边缘面积的计算进行了插值处理，从而使利用算法模型对湿饱和蒸汽干度测量的绝对误差小于±3.0%。该方法为实现实时监测蒸汽干度提供了可靠的方法，对提高稠油热采的效率有重要意义。

关键词: 矩阵电导法, 湿饱和蒸汽, 蒸汽干度, 测量误差