Method and system for plugging a subterranean well

A method for plugging a subterranean well (6), comprising the steps: running a perforating tool (1) into the subterranean well and positioning the perforating 5 tool in a well section (L) to be plugged; operating the perforating tool to create a plurality of holes (10) in a part (5) of a casing (4) located in the well section; running a surge tool (2) into the well; operating the surge tool (2) to lower the pressure inside the part (5) of the casing (4) located in the well section (L) and flowing a well fluid from an annulus (11) between the casing (4) and a well 0 formation (7) through the holes (10); and pumping a fluidized plugging material into the well section (L) via a tubing string (9). There is also provided a surge tool (2) for use in a subterranean well, having a fluid chamber (20) and a flow barrier element (23), where the flow barrier element (23) is a valve or the flow barrier element (23) is a breakable fluid restriction, the surge tool (2) 5 being configured to flow fluid from the subterranean well into the fluid chamber (20) upon opening of the fluid barrier element (23).