step is to begin the recovery of crude oil 10 fig1 and fig3 are sufficient to illustrate the postdrilling steps required to produce crude oil 10 from producing formation 12 in brief overview the recovery process requires the introduction by pressure injection of a hot liquid hydrocarbon solvent surfactant mixture through injection holes 32 into producing formation 12 evacuation by vacuum pump of chamber 30 and optionally using pump 38 to remove crude oil 10 pooled in chamber 30 the overall effect of the combination of the aforementioned is to force crude oil 10 to migrate through producing formation 12 assisted by blast created flow channels the migration of crude oil 10 to evacuated chamber 30 is enhanced by the pressure differential created by the injection of hot hydrocarbon solvent 36 under pressure through injection holes 32 combined with the vacuum created in chamber 30 by vacuum pump 40 the heating of hydrocarbon solvent 36 assists in lowering viscosity of crude oil 10 by raising its temperature in preferred embodiment hydrocarbon solvent 36 is diesel fuel but other solvents may be used depending upon crude oil and formation properties by using liquid hydrocarbon solvent 36 the viscosity of crude oil 10 is further decreased and the flow thereby increased injection of hydrocarbon solvent 36 is performed by injection unit 42 suitable injection units 42 are available through bohanan hot oil services jourdanton texas injection unit 42 heats diesel fuel and pumps it under pressure to a delivery point in the preferred embodiment hydrocarbon solvent 36 is injected at pressures up to 6 000 p s i and a temperature of up to 250 u00b0 f the amount of solvent 36 injected into each hole preferably is.