适于低渗裂缝性油藏的堵关液流改向技术——以火烧山油田为例

The Fluid Diversion Technology by Water Shutoff and Well Shutdown Suitable for Low Permeability and Fractured Reservoirs——An example from Huoshaoshan field

对于特低渗高角度裂缝性油气藏来说,投产初期油井综合含水快速上升,部分井还出现暴性水淹,在初期进行的一系列堵水措施能取得明显效果,但随着堵水轮次增加,效果逐渐变差。试验表明,堵水后增加关井时间,堵水效果可明显提高。其原因在于改变液流方向使油水流动系统重新分布,使裂缝与基质有较长时间的充分渗吸交换。在油藏精细描述的基础上,对以往增产措施效果进行分析,总结出适于裂缝性油藏的堵关改向配套技术,经大量的矿场试验,取得了显著的增油效果,为裂缝性油藏后期的开采和稳产提供了宝贵的经验。

For reservoirs with super-low permeability and high-angle fractures, the gross water cut increases quickly and some wells are suddenly water-flooded in the early phase of development. A series of water shutoff measures carried out in this phase do obtain obvious effectiveness, but with the increasing of water shutoff rounds, the effect is getting worse gradually. Field test shows that to prolong well shutdown time after water shutoff, the effect may be improved clearly for the reason of changing the flow direction allows to redistribute oil-water flowing system by full infiltration and exchange between matrix and fractures. This paper presents fine description of the reservoir in Huoshaoshan field and analysis of previous stimulations and effects, and proposes the fluid diversion technology for such a fractured reservoir by water shutoff and well shutdown. A great deal of field tests indicates its remarkably oil-incremental effects, providing precious experiences for post phase of development and stable production for such a reservoir.