You shut in an oil well, and sometimes it takes a lot to get it started again. Solids which would have been okay in motion and just come out of the rock with the oil will settle in the pore throats, and when production resumes they can be scoured and piled up in the pore space, significantly reducing the premeability of the rock.
There is a chance the well will not produce as well as it did when shut in without an expensive frac job to reopen the pore spaces, and it may not ever produce as well as it did again.
It is a common fallacy that you can just open and close the valve like a spigot and expect the well to just start up again like nothing happened.
It is a common fallacy that you can just open and close the valve like a spigot and expect the well to just start up again like nothing happened. You should experience Alaska when the flow stops and the water separates out, in the 1,500 ft of permafrost.