Royale Energy, Inc. announced it has signed a drilling contract for three additional wells in Rio Vista Field in Sacramento Basin and expects to begin drilling operations by the end of the month. The CRC 8-3, the CRC 8-4 and the CRC 8-5 wells will be drilled under Royale’s joint venture agreement covering the Rio Vista Field. Using 3-D seismic, Royale and its partner have identified several prospective locations in the Martinez, McCormick and Capay formations in the field.