可视装置中CO与正戊烷或原油接触特征和表征方法

Visual contact characteristics and characterization of the CO and -pentane/crude oil interface

章星 王珍珍 王帅 李芳 刘红现

Zhang Xing Wang Zhenzhen Wang Shuai Li Fang Liu Hongxian

中国石油大学(北京)克拉玛依校区 石油学院, 新疆 克拉玛依 834000 2. 新疆油田公司 采油一厂地质所, 新疆 克拉玛依 834000 3. 新疆油田公司 采油二厂地质所, 新疆 克拉玛依 834000

Faculty of Petroleum, China University of Petroleum-Beijing at Karamay, Karamay, Xinjiang 834000, China 2. Geological Research Institute, No. 1 Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China 3. Geological Research Institute, No. 2 Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China

CO2混相驱油过程复杂，其中包括传质、对流和相变等问题，有些机理尚不明确，需要进行深入研究。采用联合研制的CO2混相可视驱油实验装置，恒定不同的实验压力，研究CO2在不同相态下与正戊烷、原油的垂直静态变化特征。CO2和正戊烷、原油在不同压力下表现为不同的接触形态，正戊烷、原油相对高度-时间曲线为幂函数关系，低压时曲线也可为近似线性变化。提出了“溶解膨胀速率”，不同压力条件下CO2-正戊烷、原油溶解膨胀速率随着时间变化呈减小趋势，变化曲线均为负对数关系；影响正戊烷、原油相对高度和CO2-正戊烷、原油溶解膨胀速率的因素主要是压力和流体。

CO2 miscible flooding is complex, including mass transfer, convection, phase transition and other issues. Some mechanisms are not clear and need in-depth study. The static characteristics of n-pentane or crude oil and CO2 in different phases were studied by using a CO2 miscible flooding visual device under different experimental pressures. CO2 and n-pentane or crude oil show different contact characteristics under different pressures. The relationship between n-pentane or crude oil relative height and time is a power function, and the curve at low pressure can also be approximately linear. The dissolution swelling rate of CO2 vs. n-pentane or crude oil under different pressure conditions shows a decreasing trend with time, and the curves are negative logarithmic. The factors influencing the relative height of n-pentane or crude oil and the dissolution swelling rate of CO2 vs. n-pentane or crude oil are mainly pressure and fluid properties.

国家科技重大专项项目（2011ZX05023-003）资助。

https://doi.org/10.11781/sysydz201703402