The MHF project in the Natural Buttes Unit, Bitter Creek Field, Utah has progressed through five of the eight phases of the scheduled program. The last three phases of the program are in progress. Two of the three remaining phases should be finished by 10-1-78, with the testing of CIGE 21-15-10-22 to continue until approximately 1-1-79. Results from this project indicate that IMF stimulations of low permeability sands such as the Slesa Verze-Wasatch are economically high risk. The technology necessary to perform an MHF is adequate, however the results anticipated must be carefully evaluated with respect to economics.