THE MOST SIGNIFICANT SOURCE OF SURFACTANT FLOODING IS TREATED SEA WATER. CHEMICALS ARE EMPLOYED IN TREATMENT PLANTS SHOULD BE COMPATIBLE WITH SURFACTANT MIXTURE. AN EXPERIMENTAL STUDY IS CONDUCTED TO ASSESS THEIR INTERACTIONS ON THE SURFACTANT SYSTEMS. FOR THIS PURPOSE, CHEMICALS OF A TYPICAL WATER TREATMENT PLANT ARE SUPPLIED: CORROSION INHIBITOR, SCALE INHIBITOR, BIOCIDE, O2 SCAVENGER, COAGULANT, AND ANTIFOAM. FURTHERMORE, 3 TYPES OF ANIONIC, CATIONIC, AND NONIONIC SURFACTANT MIXTURES ARE SELECTED. THEIR SOLUTIONS ARE PREPARED IN SEA WATER. TWO METHODS ARE APPLIED TO EVALUATE compatibility OF CHEMICALS: A QUALITATIVE METHOD THAT IS THE COMPARISON OF SURFACTANT SOLUTION TURBIDITY BETWEEN TWO STEPS: BEFORE AND AFTER ADDITION OF CHEMICALS. ANOTHER METHOD IS THE QUALITATIVE MEASUREMENT OF THE SURFACE TENSION. compatibility IS EXAMINED OVER A WIDE RANGE OF OILFIELD CHEMICALS. THE RESULTS INDICATE SURFACTANT MIXTURES RETAIN THEIR STABILITY IN THE PRESENCE OF OILFIELD CHEMICALS. TURBIDITY OF THE SURFACTANT SOLUTIONS IS CONSTANT AFTER ADDITION OF CHEMICALS EXCEPT TO HIGHER CONCENTRATIONS OF ANTIFOAM. ACCORDING TO SURFACE TENSION MEASUREMENTS, SCALE INHIBITOR, O2 SCAVENGER, AND COAGULANT DO NOT HAVE ANY INTERACTIONS WITH SURFACTANT SYSTEMS. HOWEVER, OTHER CHEMICALS PRESENT SYNERGISM EFFECTS OF THE SURFACTANT SOLUTIONS. ANTIFOAM SHOWS THE GREATEST EFFECT ON THE SURFACE PROPERTIES OF SURFACTANT SOLUTIONS IN COMPARISON WITH CORROSION INHIBITOR AND BIOCIDE.