The immediate product extracted from oil and gas wells consists of mixtures of oil, gas, and water that is difficult to transport, requiring a certain amount of field processing. Basing the text on their lectures, Abdel-Aal (emeritus, chemical engineering and petroleum refining, King Fahd U. of Petroleum & Minerals, Saudi Arabia), Aggour (petroleum engineering, King Fahd U.), and Fahim (chemical engineering, Kuwait U., Kuwait) present a guide for engineering students in oil and gas field separations and treatments. They cover oil and gas composition, two-and three-phase separation, and treatment of produced fluids. A separate section is devoted to natural gas.