The driving force of primary migration is mainly abnormal high pressure and that of secondary migration is buoyance and fluid potential difference.
初次运移的动力主要是异常高压，二次运移的动力主要是浮力和流体势差。
2
The pickling process removes materials that may react with the main treatment fluid to create undesirable secondary reactions or precipitates damaging to the near-wellbore reservoir formation.
酸浸过程去除了可能与主处理液反应的物质，这些物质会产生不希望产生的二次反应或损害近井地层的沉淀物。
3
The studied results show that different secondary changes occurred in fluid inclusions of various rocks and no primary inclusion has been found.