基于偏心因子修正的孤北稠油粘度预测模型

A viscosity prediction model of Gubei heavy oil based on correction of acentric factor

为避免开展复杂的地层稠油粘度测试,简化PR粘度预测模型求解过程并提高预测模型的适用性,建立了一种基于偏心因子修正的孤北稠油粘度预测模型。通过稠油脱水、掺水实验及不同含水率下的粘度测试,建立可用于PR粘度预测方程的地面脱气原油粘度与含水率和温度的计算关联式,简化地面脱气原油粘度测定实验;通过修正Edmister偏心因子的求解误差,提高PR粘度预测方程的预测准确性。针对孤北1-38井稠油建立粘度预测模型,以多因素、多水平数的地层稠油环境参数为初始条件,进行地层稠油粘度数值模拟。实验和模拟结果表明,重质馏分含量高,导致地层压力升高,轻质组分降粘效果不明显,温度、含水率和气液比是影响地层稠油粘度的主要因素。

In order to avoid conducting complex viscosity test of formation heavy oil,simplify the solving process of PR vis?cosity prediction model and finally improve the applicability of prediction model,a viscosity prediction model of Gubei heavy oil was established based on correction of acentric factor.Based on dehydration,blending tests and viscosity tests under different water cuts of heavy oil,the viscosity correlation of ground degassed crude oil viscosity with water cut and tem-perature for PR equation was established to simplify the related viscosity experiment.It can also be used to improve accuracy of PR viscosity prediction equation by correcting the calculation error of Edmister acentric factor.The viscosity predic-tion model of Gubei1-38 heavy oil was established for numerical simulation taking environment parameters of formation heavy oil with multi-factor and multi-level as initial conditions.The test and calculation results show that high content of heavy fraction results in the increase of formation pressure,and viscosity reduction effect is not obviously related to the light fraction,while temperature,water content and gas-liquid ratio is the main influencing factors of viscosity of the forma-tion heavy oil.