The impact of starting pressure gradient must be considered due to existence of starting pressure gradient and recovery difficulty during the development of low permeability oil reservoirs.
低渗透油田由于存在启动压力梯度,开采难度很大,因此,在低渗透油田开发时必须考虑启动压力梯度的影响。
3
The variation of flow velocity in high gradient reveals the paroxysmal characteristics of the development of rill.