针对多相流动下稠油热采井注汽过程中耦合机理不明确,开采参数优化不完善的问题,基于气液两相流理论,考虑井筒倾斜影响,结合井筒液膜分布特征,建立稠油热采井全井段气液两相热流耦合模型,分析不同参数对井筒内湿蒸汽热力学性质的影响规律。研究表明:井筒倾斜角小于45 °时,湿蒸汽热力学性质受井筒倾斜程度影响较显著;井筒倾斜角大于45 °后,对湿蒸汽热力学性质的影响逐渐减弱;蒸汽压力、蒸汽温度、蒸汽干度等随井深增大而发生变化,水平段的变化更显著。对辽河油田3口热采井注汽量等参数进行优化,在预期的油井产量条件下,注汽量分别降低了15.3%、16.6%、14.7%,显著降低了热采水平井的开发成本。该研究对指导井口注汽参数优化,提高注汽热效率具有重要指导意义。
关键词：
热采井; 稠油; 耦合; 井筒; 两相流动
To address the problems of unclear coupling mechanism and imperfect optimization of production parameters in the process of steam injection in heavy-oil thermal recovery wells with multiphase flow, the influence of wellbore inclination was considered based on the theory of gas-liquid flow, a gas-liquid heat-fluid coupling model for whole interval of heavy-oil thermal recovery wells was established in combination of the distribution characteristics of fluid film in the wellbore, and the influence of different parameters on the thermal properties of wet steam in the wellbore was analyzed. The study indicated that, when the wellbore inclination angle was less than 45 °, the thermodynamic properties of wet steam were significantly affected by wellbore inclination; when the wellbore inclination angle was greater than 45 °, the influence on the thermodynamic properties of wet steam was gradually decreases; the pressure, temperature and dryness of the steam varied with the increase in well depth, especially in the horizontal interval. The optimization of injected steam volume and other parameters for three thermal recovery wells in Liaohe Oilfield resulted in a 15.3%, 16.6% and 14.7% reduction in injected steam volume under the expected well production conditions, greatly reducing the development cost of thermal recovery horizontal wells. The study is of great significance to guide the optimization of wellhead steam injection parameters and improve the thermal efficiency of steam injection.
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