There is the Qatar-Turkey pipeline project. The US had to take down Syria, which they did. If Qatar hurries, they can make their losses back big time.
Qatar pipeline go boom.
Skyranger 30 - Wikipedia

You’ll need a lot of those to protect a pipeline.
It’ll take a crazy number as a pipeline would be easily damaged by a VERY small (consumer size) drone.

1800km. With a radius of 3km, 300 would be needed.

That would cost about €5 billion.

suv.report/bundeswehr-will-500-bis-600-skyranger-…

I would assume that’s reasonable. Germany alone imports gas for €2 billion per month. Historically gas was half as expensive. So the system could pay off after a year. Including all of Europe, and reactivating old industry processes, that could be half a year or a quarter.

www.destatis.de/EN/…/natural-gas-monthly.html

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Taking you at your word for this, let’s say Germany spends the 5 billion to send 300 of those to guard the pipeline. What good is that should Iran decide to use it’s IRBM stock or hypersonics like the Fattah 1? Drones are only 1 part of Iran’s offensive capability.

It’s gas, so leaks are not a disaster. If they build the pipeline in segments, and several in parallel, then they can handle hits. 1 km pipeline can be built in a day.

Fattah 1 is a problem. It’s supposed to cost $200,000. That’s 5,000 for a billion. I guess I was wrong and Qatar has a problem.

Can these things hit 100 or 1000 swarming micro drones? I really don’t know, but would bet that it’s got a limited amount of tracking and fire-rate. At say $1000 per drone including a couple pounds of high explosive charge, I doubt a single one of these can guard any zone.

200 rds per minute single shot rate, 1200 burst rate.

So firing takes 1/20 second, which leaves the rest of 1/3 second to aim at the next target. I don’t know if that is realistic.

If the drones fly 360km/h that leaves 60 seconds to take them down. (3dprinting.com/…/chinese-students-custom-3d-print…)

There is an additional rocket launcher with 60 missiles.

So alltogether handling 100 drones should be possible.

Chinese Student's Custom 3D Printed Drone Sets New Speed Record - 3D Printing

A microdrone designed by Chinese student Xu Yang has established a new Guinness World Record, reaching a speed of 340.78 km/h (211.75 mph).

3D Printing