According to the CIA World Fact Book, the population of Saudi Arabia is about 27 million:
https://www.cia.gov/library/publications/the-world-factbook/geos/sa.html
According to this report, most of the workers in their oil fields are from Yemen, and about 4 million Yemenis are living in SA:
http://www.washingtonsblog.com/2015/05/most-of-the-existing-workers-in-the-saudi-oil-fields-are-yemenese-and-there-are-over-4-million-yemenese-in-saudi-arabia.html
Sounds like an invasion of Yemen would open a real can of worms for them.
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