CO2混相驱多级接触过程机理研究

目前中国陆上油田综合含水达81%,产量出现递减,发展注气提高采收率技术成为陆上石油工业发展的迫切战略性任务。由于CO₂混相驱在油田小范围的应用非常成功,开始进一步研究CO₂混相机理指导油田大规模开采。CO₂混相驱静混相机理,如CO₂在油中膨胀并降低原油粘度很完善,但动混相机理即CO₂混相多级接触过程中气液两相物性参数变化未详尽研究。建立计算CO₂多级接触过程流体物性参数的一维数值模拟方法,结合中原油田井流物数据对混相前缘及后缘气液相组成、密度、粘度等参数动态变化进行研究,对发展注气提高采收率具有重大意义。

MECHENISM OF CO2 MISCIBLE FLOODING DURING MULTIPLE CONTACT PROCEDURE

Nowadays, synthetic water cut in on-shore oil fields reaches 81%. Outputs begin decreasing, as a result, developing enhanced oil recovery by injecting gas becomes a tactic task for sustainable development of on-shore oil industry. The wide range application of CO₂ injection based on the success of field test requires further study of mechanism of CO₂ miscible flooding procedure. Though it is well known that CO₂ decrease oil viscosity by swelling in it, the variation of physical parameters of each phase in the procedure of multiple contact is not well studied. In this paper, the author established a one-dimensional simulation method considering Zhong Yuan oil field tocalculate and analyze such parameters as composition, density,viscosity and interfacial tension.