Foreign buyers can apply for permanent resident status in the USA for the buyer and immediate family.

The buyer must invest $1,000,000 in an existing business or a new starting business, this business must create full time employment for 5 people.
Or, invest $500,000 in a "targeted employment area, this business must create full time employment for 10 people.

We can find oil properties that provide you what is required for permanent residence status.

Below are links to several attorneys specializing in EB5 visas:
http://www.greencardinvestor.com/attorneys.html
http://www.antaoandchuang.com/en/permanent-residency-green-cards/eb-5-investors
http://www.h1b.biz/lawyer-attorney-1135849.html
http://eb5info.com/practice_areas/79-eb-5-regional-center-application-submission-provider/attorneys