There is more evidence from yet another study, the “Hydraulic Fracturing Study“, published in October 2012, that concludes that hydraulic fracturing, or fracing, is safe and does not pollute either air or water or cause earthquakes. This study was prepared for Plains Exploration & Production Co., an independent oil and gas company, and the Los Angeles County Department of Regional Planning, and was conducted by Cardno Entrix, an international environmental and natural resource management consulting firm. The study examined two test wells at the Inglewood Oil Field in Los Angeles County, California, and determined that there were no detectible indications that fracing might induce earthquakes or have a negative impact on air or water quality.
The Inglewood Oil Field is one of the largest urban oil fields in the United States and is adjacent to Baldwin Hills, View Park, Windsor Hills, Blair Hills, Ladera Heights, and Culver City, California. The oil field was discovered near Culver City by Standard Oil in 1924. Plains Exploration has been operating there since December 2002, and conventional fracing has been used in the field by prior operators. The field contains 1,200 acres and a total of 1,475 wells have been drilled. 469 wells are in active production and 168 waterflood injection wells are active at this time.
The Cardno study was part of a settlement in 2011 of a lawsuit filed in 2008 against Los Angeles County and Plains Exploration over land use. Schlumberger Ltd. and Pinnacle, a company owned by Halliburton, did the micro-seismic monitoring and fracture mapping. Plains Exploration also did a high-rate gravel pack job at two different wells earlier this year to help collect information for this study. The study concluded, in part, that: “(t)ests conducted before, during, and after the use of hydraulic fracturing and high-rate gravel packing showed no effects on the integrity of the steel and cement casings that enclose oil wells. There is also an ongoing program of well integrity tests at Inglewood oil field.”