Determination of the location of the flame front in a subterranean formation

Claim 1

IN THE PROCESS FOR THE RECOVERY OF HYDROCARBON MATERIALS FROM A SUBTERRANEAN FORMATION CONTAINING HYDROCARBOSN AND HAVING AN IMPUT WELL LEADING THERETO AND AT LEAST ONR OUTPUT WELL LEADING THEREFROM BY COMBUSTION WITHIN SAID SUBTERRANEAN FORMATION WHEREIN FLAME FRONT TRAVELS THROUGH SAID SUBTERRABEAB FORMATION FLAME FROM TRAVELS THROUGH SAID SUBTERRANEAN FORMATION FROM SAID INPUT WELL TO SAID OUTPUT WELL, THE STEPS COMAND SAID OUTPUT WELL AND THE THICKNESS OF SAID SUBTERRANEAN FORMATION, DETERMINING THE POROSITY OF SAID SUBTERRANEAN FORMATION, DETERMINING PRIOR TO INITIATION OF COMBUSTION WITHIN SAID SUBTERRANEAN FORMATION, PASSING GAS SATURATION OF SAID SUBTERRANEAN FORMATION, PASSING GAS PRIOR TO INITIATION OF COMBUSTION EITHIN SAID SUBTERRANEAN FORMATION THROUGH SAID SUBTERRANEAN FORMATION BETWEEN SAID INPUT WELL SAID AND AT A KNOWN GAS PRESSURE AT SAID INPUT WELL AND AT SAID OUTPUT WELL WHEREBY THE VALUE OF A FIRST DIMENSIONLESS TIME FACTOR O RELATED TO THE PRESSURE AT WHICH GAS REACHES SAID OUTPUT WELL AND THE PRESSURE AT WHICH GAS REACHES SAID OUTPUT WELL MAY BE TAKEN FROM THE ACCOMPNYING FIGURE, INITIATING COMBUSTION WITHIN SAID SUBTERRANEAN FORMATION, SUPPLYING COMBUSTION SUPPORTING GAS TO SAID SUBTERRANEAN FORMA-