but below the rock yield stress pressure after placing said device into said wellbore or borehole a proppant of a size sufficient to prop resultant fractures is injected into the wellbore or borehole said proppant is suspended in a liquid carrier fluid prior to being injected into said wellbore or borehole proppants and methods for packing said proppants are discussed in u s pat no 4 109 721 issued to slusser on aug 29 1978 this patent is hereby incorporated by reference liquid carrier fluids which can be utilized herein are discussed in u s pat no 3 642 068 issued to fitch et al on feb 15 1972 this patent is hereby incorporated by reference some of these liquids include water lease cruide oil diesel oil natural gums gels and thixotropic fluids for example an aqueous solution which can be used as a carrier liquid is discussed in u s pat no 4 067 389 issued to savins on jan 10 1978 this patent is hereby incorporated by reference once the injection of the carrier fluid with proppant therein is in place at the desired productive interval said device is ignited ignition of the propellant causes the generation of heat and gas preesure and provides the means for creating multiple fractures as is known to those skilled in the art the amount of heat and pressure produced is dependent upon the kind of propellant used its grain size and geometry heat and pressure generation also depends upon the.