TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The alkaline-earth halide salt is selected from calcium chloride, magnesium chloride, calcium bromide, calcium iodide, magnesium bromide and/or magnesium iodide (preferably calcium chloride).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The carbonyl compound is urea or dimethyl carbonate. The carbonyl compound and the alkaline-earth halide salt are present in the diversion agent at molar concentrations of 0.1-10 M. The diversion agent has a carbonyl compound to alkaline-earth halide salt molar ratio of 10:1 to 1:10. The diversion agent further comprises a flow control additive and an internal breaker. The acid solution comprises a member selected from the hydrochloric acid, acetic acid, formic acid, citric acid, oxalic acid, nitrilotriacetic acid (NTA), ethylenediamine tetraacetic acid (EDTA), and/or diethylenetriamine pentaacetic acid (DTPA). The acid solution comprises a member selected from chelating agent nitrilotriacetate, ethylenediamine tetraacetate, and/or diethylenetriamine pentaacetate. Preferred Method: The decomposition occurs at greater than or equal to 135(preferably 150) degrees C. The method further involves stimulating the subterranean formation subsequent to the injecting in order to increase fracture flow with in at least one additional fracture; exposing the carbonate precipitate to an acid solution sufficient to unblock the high flow fracture; and cooling selected portions of the subterranean formation prior to injecting in order to substantially reduce precipitation of the carbonate precipitate in target fractures adjacent the selected portions. At least one high flow fracture is blocked by the alkaline-earth carbonate precipitate. The stimulating is accomplished by hydraulic stimulation. The subterranean formation is adjacent to a geothermal well, petroleum recovery or injection well.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The internal breaker is a time delay thermally degradable polymer. The flow control additive is particulate calcium carbonate, which also acts as a nucleation seed for the carbonate precipitate. EXAMPLE - No suitable example given.