The Oxnard Oil Field in Ventura County, California doesn’t fit the stereotypical image of an oil patch. There are few pumpjacks bobbing away like in the dusty fields of Kern County, nor any massive open pit mines like those in the tar sands country of Alberta, Canada. Oxnard is better known as the “Strawberry Capital of the World,” and the oil wells and storage tanks there are scattered among the berry fields and rows of broccoli, onions, and tomatoes. By day, farmworkers from Mexico and Central America harvest the crops. At night, oil workers come in and set up stadium lights to work by. The oil production is camouflaged by the farmland, making the tar sands extraction there one of California’s best-kept hydrocarbon secrets.
The oil deposits underneath the farm fields are mostly bitumen – AKA oil sands, AKA tar sands – a mix of clay, sand, water, and petroleum that at room temperature is almost solid. Thinning out and refining such stuff is expensive, and most wildcatters ignore it for other lighter, “sweeter” oil deposits. But when oil hit $100 a barrel seven years ago, some oil companies saw an opportunity and swooped into the area to take over abandoned wells from bankrupted companies. According to the California Division of Oil, Gas, and Geothermal Resources (DOGGR), there are as many as 55 tar sands wells in the area.
The tar sands deposits are extracted via two techniques that are commonly used for accessing other “unconventional” oil deposits. The first is called cyclic steaming, or “huff and puff” in industry-speak. First comes the huff, an underground injection of 10,000 to 20,000 barrels of steaming water shot 2,500 feet underneath the surface, which in the Oxnard area passes through the groundwater table that feeds the municipal water supply. Drillers then install two wells, one of which goes for the deposits. Next comes the puff. A second well nearby uses natural gas to fire up generators to heat the ground to at least 550 degrees Fahrenheit. The steam melts the tar sands so it can come to the surface. The second technique is called steam-assisted gravity drainage (or SAG-D), which has become increasingly common in the tar sands fields of Alberta. SAG-D is a hyped-up version of huff-and-puff that uses multiple steam sessions and hotter temperatures to recover more bitumen.
These techniques for scraping the bottom of the oil barrel have been linked to various problems. For starters, the volume of wastewater is enormous. Every barrel of cyclic-steamed oil creates eight to ten barrels of wastewater, which is re-injected back into the earth. Casing errors are not uncommon. A 2008 paper by Chevron engineers found that one out of every five wells at a 370-well Kern County steaming project had casing failures. Three years after that paper was published, a Chevron field supervisor was boiled alive in ground made unstable by cyclic steaming.
In 2010, a Ventura County farming company called Pleasant Valley accused one of the tar sands drillers – Tri-Valley, which operated at least 10 wells in the area – of contaminating its water supply after farmworkers found a thick layer of an oily substance floating in a cistern used for irrigation. While disputing the charge, Tri-Valley agreed to spend close to a million dollars to clean up the site.
Small drilling companies aren’t the only ones involved in the Oxnard tar sands. Vintage Petroleum, a subsidiary of a global multinational Occidental, is also extracting oil there. Vintage representatives would not answer questions about their operations, but Donald Drysdale, a spokesperson for DOGGR, said Vintage’s diluted bitumen goes “to a refiner in the LA Basin, through the Crimson Pipeline network.”
The tar sands extraction remains a mystery to many, shrouded by the veneer of the area’s agricultural fields. No doubt the oil industry prefers it that way.
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