水平气井气￣水￣油三相流动压降模型

Pressure drop model of gas-water-oil three-phase flow in horizontal gas wells

刘永辉 曹玉峰 王朗 罗程程 王旭 鲁光亮 叶长青 杨建英

西南石油大学石油与天然气工程学院，四川 成都 610500 中国石油塔里木油田分公司，新疆 库尔勒 841000 中国石化
西南油气分公司采气一厂，四川 德阳 618000 中国石油西南油气田分公司，四川 成都 618300

准确预测气井井筒压降是进行产能预测、排水工艺设计的技术关键，气井低产气量时的搅动和产凝析油的特征使得目前工程常用压降模型的运用受到很大限制。为此，开展了气￣水￣油三相管流实验，定性分析了气相表观流速、液相表观流速、含水率和倾斜角对井筒持液率的影响。分析结果表明，持液率与气相表观流速呈对数关系，持液率与液相表观流速呈线性关系，而持液率与含水率和倾斜角呈二次项关系。基于实验数据，选择无因次准数，建立了新的预测水平井气￣水￣油三相流动的压降模型。采用压降数据对新模型进行了验证，结果表明，与常用工程压降模型相比，新模型精度最高。该研究成果对水平气井的高效开发具有重要的意义。

Accurate pressure drop prediction in gas wells is crucial to evaluate the productivity and design the technology for deliquification. Currently, commonly used pressure drop models are very limited in gas wells due to gas well agitation at low gas production and condensate produced. Therefore, the gas-water-oil three-phase pipe flow experiment was carried out, and the influence of gas superficial velocity, liquid superficial velocity, water cut and inclination angle on the liquid holdup was qualitatively analyzed. The analysis results show that there is a logarithmic relationship between gas superficial velocity and liquid holdup, while liquid superficial velocity is linearly correlated with liquid holdup. Furthermore, the water cut and inclination angle can be quadratically related with liquid holdup. Based on the experimental data and designed dimensionless number, a new pressure drop model is established for predicting gas-water-oil three-phase flow in horizontal well. The verification results of new model with pressure drop data show that the new model has highest accuracy compared with the common engineering pressure drop mode. The research results are of great significance for the efficient development of horizontal gas wells.

10.6056/dkyqt202203020