This was just posted a few hour ago at UpstreamOnline, which is very reputable:
http://www.upstreamonline.com/live/article183759.ece

These are very serious allegations... the USA currently gets almost 1 mbpd, about 18% of its domestic production from these low-output wells:
http://en.wikipedia.org/wiki/Stripper_well

This is not insignificant, and for any company to deliberately damage wells to prevent a rival company from extracting the remnants is a very serious matter.

Please keep in mind, our energy security has been largely entrusted to companies like Exxon.
This is not encouraging....