Abstract
To explore the influence of complexity of reservoir properties in porous media and the diversity of operating conditions on the steam distillation rate of crude oil in the process of heavy oil exploitation with steam injection, steam distillation simulation devices are used to study steam distillation rate of crude oil in porous media. Then steam distillation ratio is obtained under the condition of different core permeability, oil saturation, steam temperatures, system pressure, steam injection rates and steam distillation rates with different viscosities of crude oil. The results show that the steam distillation rate of crude oil in porous media depends mainly on the nature of the crude oil itself, for temperature and pressure are the key factors compared with the pore structure, the initial oil saturation and steam injection rate. The experimental results help estimate the amount of crude oil and the required steam in the reservoir in the steam drive process, aiming to facilitate the optimization design and operation of steam drive.
Highlights
The distillation of crude oil in porous media is one of the major mechanisms in viscous oil recovery driven by steam, which is determined by distillation characteristics of crude oil at high temperature [1, 2]
Farouq Ali held the view that the total steam distillation accounted for 5% to 10% of the steam drive recovery [5]
The steam is injected from the lower part of the distillation chamber and the steam distillation is conducted by the core sand and crude oil
Summary
The distillation of crude oil in porous media is one of the major mechanisms in viscous oil recovery driven by steam, which is determined by distillation characteristics of crude oil at high temperature [1, 2]. K.C. Hong estimated that for the reservoir with the crude oil viscosity of 5mPa·.s, the contribution of steam distillation to the steam drive recovery was 18% [6]. The steam distillation mechanism is considered as an important mechanism of steam drive recovery, there are few researches on the intensified distillation in the porous medium reservoirs, letting alone the factors affecting the steam distillation rates. There are no baffle plate, separator and baffles, which are used for core sand and oil filling. The steam is injected from the lower part of the distillation chamber and the steam distillation is conducted by the core sand and crude oil. The fluid collection system consists of a condenser, back pressure regulators, gas-liquid separator, dry ice room and wet type gas meter
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