Abstract: Following many-year high rapid development of Sangonghe formation in Cainan field, hinterland of Junggar basin, quite a number of production wells has been entered into the phase of medium-high water cut, and most wells have been yielded in single layer without any measure of water plugging/resisting and supplementary layer recovery. This paper presents lifting timing for different types of wells which may increase fluid-yielding amount or IOR of single well and allow the water cut to be stabi-lized or dropped, while oil production to be increased effectively, based on features of low crude viscosity and high mobility as well as in-depth understanding of oil-water contact for each well. Through stable production of the whole reservoir, such a part of wells has been improved in ultimate recovery factor with very significant economic benefit.

Key words: Junggar basin, Cainan field, fluid production, IOR, water cut, stable production