Abstract: Oil-water simulaneous production, a new technology developed abroad since 1990s, is primanily applied to eliminale or control water coning in reservoir with botom water. With numerical simulation method, it is preferred ihat the proper time of oil- water simultane-ous production is when water cut reaches 30%~40%, the reasonable perforation position in water layer is near oil-water contact, the best water- oil ratio is 3:1. Three-well response evaluation shows that oil-water simultaneous production can effectively control raise of water cut, make oil production stable and enhance oil recovery.

Key words: Tuha basin, edge water, bottom water, technology, water coning