| abstract |
Improved fracturing of subterranean reservoirs with fracturing fluids containing high molecular weight polymers, e.g., polyacrylamides, is obtained by first fracturing the formation with the fracturing fluid, and thereafter injecting 5-1,000 gallons per vertical foot of reservoir of an aqueous solution containing 0.005 percent to about 30 percent by volume of hydrazine. The hydrazine tends to increase permeability to the flow of reservoir fluids, the permeability having been reduced by the high molecular weight polymers in the fracturing fluid. |