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The article offers information on Macpherson Energy, which is using horizontal drilling in California's Round Mountain oil field. It is stated that the company, through its operating company Macpherson Oil Co., has brought 56 wells into production using horizontal drilling in the oil field. and has expanded production from the field nearly threefold. The company found that its thermal production program using vertical wells improved heavy oil mobility in a shallower, low-permeability zone.