上漏下溢工况下气液两相流流经裂缝后井筒含气率预测模型

Prediction model of gas void fraction in wellbore after gas-liquid two-phase flow through fractures under upper loss and lower influx condition

摘要

针对深部裂缝地层上漏下溢工况下气液两相流流经裂缝后井筒含气率变化规律认识不清的问题,利用可视化井筒-裂缝耦合试验装置,系统开展353组不同流型、液体物性及流动参数条件下气液两相漏失试验,测量漏失流体含气率,基于无量纲分析建立漏失流体含气率预测模型及漏失后井筒含气率计算模型。结果表明:井筒中流型为泡状流、段塞流和搅拌流时,漏失流体含气率依次升高;漏失流体含气率与井筒含气率呈正相关,同时,其受液体黏度、密度、表面张力、表观气速及表观液速等多因素共同影响;漏失流体含气率预测模型最大误差小于20%,漏失后井筒含气率预测模型平均误差为2.36%;该模型可应用于上漏下溢工况下多相流建模以及井控设计。

Abstract

Due to unclear understanding of the change law of gas void fraction in the wellbore after gas-liquid two-phase flow traversing fractures under upper loss and lower overflow conditions in deep fractured formations, a visual wellbore-fracture coupling experimental device was used to systematically carry out 353 groups of gas-liquid two-phase leakage experiments under different flow patterns, liquid physical properties and flow parameters. The gas void fraction of the leakage fluid was measured, and the prediction model of the gas content of the leakage fluid and the calculation model of the gas content of the wellbore after leakage were established based on the dimensionless analysis. It is found that void fraction in the leakage fluid increases when the flow pattern in the wellbore is bubbly flow, slug flow and stirring flow. The void fraction of leakage fluid is positively correlated with the void fraction in the wellbore, and it is influenced by many factors such as liquid viscosity, density, surface tension, and superficial phase velocities. The maximum error of the leakage fluid void fraction prediction model is less than 20%, and the average error of the wellbore void fraction prediction model after leakage is 2.36%. The model can be applied to multiphase flow modeling and well control design under upper loss and lower influx conditions.

关键词

上漏下溢 / 气液两相漏失 / 深部裂缝地层 / 井筒含气率

Key words

upper loss and lower overflow / gas-liquid two-phase loss / deep fractured formation / void fraction

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基金资助

国家自然科学基金基础科学中心项目(52288101)