海上稠油热化学驱三维物理模拟

依据渤海某稠油油藏的地质特征自主研发设计大型三维物模设备,研究在蒸汽驱过程中伴注化学剂和烟道气等增产措施对稠油热采的强化作用,分析模型温度场和剩余油饱和度场的分布特征,根据三维物模实验条件建立数值模型,验证三维物模实验结果的精确性。结果表明:相比于普通蒸汽驱,热化学驱的单井采收率可提高5.89%,加入烟道气进行强化热化学驱后,气体的隔热增能作用和泡沫的调堵驱油作用可以大幅度扩大油层的热波及面积,提高原油采收率,模型的单井含水率下降了28.17%,采收率提高了37.19%;数值模拟结果与物模实验结果具有良好的拟合程度。

Three-dimensional physical simulation of thermochemical flooding for offshore heavy oil

A large-scale three-dimensional equipment for physical simulation experiment was designed and manufactured based on the geological characteristics of a heavy oil reservoir of Bohai Sea.The enhancing effect of chemical additives and flue gas on the thermal recovery of heavy oil during steam flooding was studied.And the distribution characteristics of temperature and residual oil saturation in the three-dimensional model were analyzed.Then a numerical model was established according to the conditions of three-dimensional physical model to verify the accuracy of the physical simulation experiment.The results show that the single well recovery of thermochemical flooding increases by 5.89%in comparison with the conventional steam flooding.The enhanced thermochemical flooding by adding flue gas greatly expands the thermal sweep area of the reservoir and improves the oil recovery,due to the heat insulation effect of the flue gas and the plugging effect of the foam.The water cut of the single well decreases by 28.17%,and its oil recovery increases by 37.19%.Meanwhile,the results of numerical simulation fit well with that of physical simulation experiment.