They focus on formation conformance efficiency and flushing efficiency, and all the recovery techniques are based on these two respects, and the corresponding techniques are called tertiary recovery or Enhanced Oil Recovery (EOR).

• 他们关心地层的波及效率和冲刷效率，所有的驱替开采技术都基于这两个方面，按照技术的分类把它称为三次采油或称为提高采收率法采油。