During well testing in low permeability reservoir, the produced fluids could not flow out of the wellbore, and there occurred a slug flow at wellbore.

• 在低渗透油田的测试过程中，井筒中的流体常因流不出地表而在井筒中发生段塞式流动，使流动与恢复测试阶段的井筒压力均上升。