FOAMING AGENT FOR OIL WELL DRILLING AND PRODUCTION; CHEMICAL COMPOSITION FOR SOLUTION IN OIL FIELD FLUID FOR INHIBITING CORROSION AND SCALE IN PIPING AND CONTAINERS; CHEMICAL AGENT FOR STIMULATING PETROLEUM WELLS; PARAFFIN SOLVENT FOR PIPES AND CONTAINERS IN OIL FIELD USE; CHEMICAL COMPOSITION FOR DISSOLVING AND SUSPENDING PARAFFIN IN PETROLEUM PRODUCTS