彩9井区西山窑组特低渗油藏高含水期加密调整试验

Well Infill Adjustment Test of Xishanyao Ultra-Low Permeability Reservoir in High Water Cut Stage in Wellblock Cai-9 of Cainan Oilfield,Junggar Basin

准噶尔盆地彩9井区中侏罗统西山窑组为低孔特低渗砂岩油藏,目前已进入高含水低产低能阶段,即将面临废弃停产的严峻局面。对彩9井区西山窑组特低渗油藏渗流特征及剩余油分布规律进行了研究,提出在油井井间剩余油富集带加密注水井以缩小注采井距、提高注采井数比以提高动用程度的调整方案,方案在先导试验井组实施并取得成功,为后续油藏全面调整开发提供技术思路。

The Xishanyao formation in Cai-9 well block of Cainan oilfield in Junggar basin is a low-porosity and ultra-low permeability sandstone reservoir,which is now faced with cessation of production and to be abandoned due to its high water cut and very low production.This paper studied its percolation feature and remained oil distribution,and then proposed the adjustment system for infill injectors in interwell remaining-oil enrichment zones in order to decrease the injector-producer spacing,increase the ratio of injection-production wells and improve reserves producing degree,and obvious successful effects have been obtained in such pilot testing well groups in this reservoir.It provides technical support and ideas for rest reservoirs adjustment and development in this area.