CNBC | Oil driller Venoco files bankruptcy after spill gulfnews.com Denver-based Venoco's primary assets are oil-weighted and located onshore and offshore in Southern California. It also has an interest in the Hastings Field onshore along the Gulf Coast of Texas, according to its website. It was founded in 1992 by ... US oil producer Venoco files for bankruptcy Venoco Files For Bankruptcy Nearly One Year After Refugio Oil Spill Venoco Files Chapter 11 Due to Oil Price Slump |