摘要
针对LBC(Lohrenz-Bray-Clark)、CS(Pedersen)及PR(Peng-Robinson)黏度预测模型不能同时兼顾精度、理论性以及计算简便性的问题,考虑温度、压力和组分相互作用等影响因素,对基于PR状态方程的黏度预测模型进行了改进,形成了适用于高温高压条件下CO2-原油体系的新黏度预测模型。将模型中的无因次量由常量改进为与体系温度相关联的函数形式,提高了模型的计算精度;引入二元相互作用因子和CO2有效摩尔分数,修正了用于混合体系计算时的黏度混合法则。以油田现场油样实测气相和液相组分数据为基础,在油藏温度和压力条件下,对模型改进前后计算黏度的精度进行了对比。结果表明,新黏度预测模型不仅计算简便,而且精度显著提高,满足工程应用要求。
The existing viscosity models, including LBC （Lohrenz-Bray-Clark） Model, CS （Pedersen） Model and PR （based on PR Equation of State） Model, could not take into account accuracy, theory strictness and calculation convenience simultaneously. This study considers temperature, pressure, interaction between components and other affecting factors to improve the viscosity model based on PR EOS （equation of state） and finally establishes a new calculation model for CO2-crude system under high pressures and high temperatures The accuracy of the PR model is improved by changing the dimensionless constant in the model into a function related to the system temperature. Furthermore, the mixing-rule in viscosity calculation of mixture is modified through introducing the binary interaction factor and effective mole fraction of CO2. Based on gas and liquid phase components of field oil samples from actual measurement, the calculation accuracy of models before and after improvement were compared, which shows that the new viscosity model is not only simple in computation, but also much more accurate, meets the industrial requirements.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2014年第5期591-596,共6页
Petroleum Exploration and Development
基金
国家重点基础研究发展计划(973)项目04课题“孔隙介质中相态实验与理论研究”(2011CB707304)
国家油气重大专项“CO2驱油与埋存油藏工程技术及应用”(2011ZX05016-002)
