长岩心注二氧化碳驱油物理模拟实验研究

Experimental study on physical modelling of crude displacement with carbon dioxide drive for long core

所研制的长岩心驱替实验装置 ,考虑了相似条件对岩心长度的需要 ,以及多次接触混相其物理化学过程的阶段性和机理的复杂性。该装置可以在油藏条件下实施多种驱替实验 ,这些实验包括 :水驱或气驱二次采油实验 ;利用注入溶剂 (如氮气、碳氢化合物、二氧化碳等 )或注入聚合物、胶态分散凝胶等化学驱油剂开展三次采油动态室内模拟实验研究。该装置岩心长为 2m ,其工作压力、温度分别为 60MPa、15 0℃。利用该实验装置成功地进行了注二氧化碳驱替实验 ,得到了文 184块油藏流体在水、二氧化碳交替驱油过程中的压力、采收率和相态变化等重要参数。

Considering the necessity of similarities upon core length, the complex mechanism and periodic physical-chemical reaction during multi-contact miscible phases, experimental unit for long core displacement was developed which will be used for a variety of displacement tests under reservoir conditions, include water or gas drive for secondary production test, solvent (nitrogen, hydrocarbon, carbon dioxide, etc), polymer, dispersible gel and other chemical oil driving agents can be injected for the indoors but dynamic simulation of tertiary production. This unit requires the core sample in length of 2 m,WP and WT are 60 MPa and 150 ℃ respectively. Long core oil displacement with carbon dioxide injection has witnessed success and some critical parameters, including pressure, recovery and phase variation, in due process of Wen 184 block have been achieved.