黑油高压物性参数模拟方法及应用

PVT parameters simulation method and application of black oil.

高压物性参数是评价储层流体性质、计算储量、开发设计、预测油田动态及三次采油不可缺少的资料。根据工程热力学原理,建立了适用于油藏烃类气-液-固三相相平衡的热力学方程,模拟计算黑油高压物性参数,并确定了气、液、固各相逸度的计算方法。胶质和沥青质是复杂的混合物,其化学结构和物理化学性质目前尚不完全明了,其物性参数在一定范围内变化。通过改进原油特征化方法,根据胜利油区原油所含胶质和沥青质的综合实验数据,选取了其物性参数及临界性质参数。利用井流物组成模拟计算黑油油藏流体的泡点压力、气油比、地层原油密度和体积系数等参数。模拟计算的高压物性参数与实验数据的相对误差均小于5%,符合程度较高。

PVT parameters are the indispensable data for evaluating reservoir fluid property,calculating reserves,designing development project,forecasting oilfield performance and making tertiary oil recovery.Phase equilibrium equations that are suitable for the gas-liquid-solid phase behavior calculation of hydrocarbon system in black oil reservoir based on engineering thermodynamics theory.Using the equilibrium to calculate PVT parameters of the black oil,and establish the computational method of gas,fluid and solid fugacity.Colloid and asphaltene are complex mixture,whose chemical structure and physicochemical property are not clear completely and would change in certain limit.The method of improving crude oil characteristics was applied to select physical and critical property parameters based on the experiment data of colloid and asphaltene in Shengli Oilfield.Well production component was applied to simulate and calculate the properties of black oil such as bubble-point pressure,gas-oil ratio,oil viscosity,volume factor,and so on.Comparing the calculation result with experimental data,a satisfactory result of less than 5%of relative error was acquired.