facilitate removal of the gel plug stem 22 from wellbore 12 is to form a solid gel stem plug 22 containing a gel breaker this gel breaker included in the gel mixture is selected from a group of chemical compounds which can break down the solid gel at temperatures of less than from about 60 u00b0 f to about 250 u00b0 f generally this breakdown will occur within from about 2 hours to about 24 hours depending upon type and concentration of breaker added chemicals satisfactory for use as gel breakers and which are incorporated into the gel mixture include enzymes and oxidizing agents suitable for breaking down the solid gel such as sodium persulfate other gel breakers sufficient for this purpose are discussed in u s pat no 4 265 311 issued to ely on may 5 1981 which is hereby incorporated by reference these chemicals are readily available from chemical suppliers and with the exception of enzyme breakers are sold under their chemical names enzyme breakers can be obtained from oil field service companies the concentration of the gel breaker incorporated into the gel mixture will vary from about 0 01 weight percent to about 0 10 weight percent preferably about 0 05 weight percent of the gel mixture although the temperature upon ignition in the wellbore may generally exceed 150 u00b0 f the gel plug stem 22 will remain intact during the generation and dissipation of energy after ignition of the propellant upon cooling to a.