During 1979 and 1981 Union Oil Company of California drilled two exploratory geothermal wells in the.Stillwater geothermal prospect area in northwestern Nevada to obtain new subsurface data for inclusion in the U. S. Department of Energy's geothermal reservoir assessment program. Existing data from prior investigations, which included the drilling of four earlier deep temperature gradient wells in the Stillwater area, was also provided. The two wells were drilled to total depths of 6946' and 10,014' with no significant drilling'problems. temperature of 353°F was measured at 9950'. The most productive well flow tested at a rate of 152,000 lbs/hr with a wellhead temperature of 252°F and pressure of 20 psig. Based upon current economics, the Stillwater geothermal prospect is considered to be subcommercial f o r the generation of electrical A maximum reservoir power This report is a synopsis of the exploratory drilling activi.ties and results, and it contains summary drilling, geologic, and reservoir information from two exploratory geothermal wells. Detailed information and data for each of the wells is available through the

During 1978 and 1979 Union Oil Company of California drilled three exploratory geothermal wells in the Cove Fort-Sulphurdale geothermal resource area in southwestern Utah to obtain new subsurface data for inclusion in the U.S. Department of Energy's geothermal reservoir assessment program. Existing data from prior investigations which included the drilling of an earlier exploratory well at the Cove Fort-Sulphurdale area was also provided. Two of the wells were abandoned before reaching target depth because of severe lost circulation and hole sloughing problems. The two completed holes reached depths of 5,221 ft. and 7,735 ft., respectively, and a maximum reservoir temperature of 353'F at 7,320 ft. was measured. The deepest well flow tested at the rate of 47,000 lbs./hr with a wellhead temperature of 200'F and pressure of 3 psig. Based upon current economics, the Cove Fort-Sulphurdale geothermal resource is considered to be sub-commercial for the generation of electrical power. This report is a synopsis of the exploratory drilling activities and results, and it contains summary drilling, testing, geologic and geochemical information from four exploratory geothermal wells. Detailed information for each of the wells is contained in four separate technical reports available through the