Chemicals used in oil drilling; chemicals for use in oil and gas industry for oil drilling, oil purifying; chemical additives for use in oil and gas wells; chemicals for use in the field of oil exploration and production; surfactants for use in connection with the oil and gas industry, namely, for use in oilfield operations; surfactants for industrial use, namely, for use in oil field operations; dispersing agents; oil dispersants; petroleum dispersants; foaming agents; wetters, namely, oil w...