关键词: 高含水油藏, 水驱, 水平井, 注蒸汽, 提高采收率, 三维物理模拟

Abstract:

For the possible existence of water-body and high-permeability channels at the mature water-flooded reservoir of Fuyu Oilfield in Jilin Province,3D high-pressure scale model was utilized to simulate steam flooding of reservoir after water flooding.The experimental results indicated that the high-permeability channels for water flowing existed at the lower part of the water-flooded positive rhythm reservoir for the reason of high water saturation.During steam flooding,steam firstly swept the lower formation from these channels and then swept the upper formation with the increase of the cumulative steam injection.Finally an even conformance of steam in the vertical formation could be realized.The steam injection after water flooding can not only effectively enhance oil recovery factor,but also effectively reduce the water cut.Meanwhile,steam-flooding experiments on different well patterns in order to study the feasibility of steam flooding in horizontal well of thin reservoirs indicated that the production performance of steam flooding in the horizontal injector was better than that in the vertical injectors,but there were some problems such as uneven steam imbibitions in the horizontal section.

Key words: high water-cut reservoir, water flooding, horizontal well, steam injection, enhance oil recovery, 3D physical model