低渗透油气藏近破裂压力注水的可行性——以北三台油田北十六油藏为例  

Feasibility of Water Injection Close to Fracture Pressure for Low Permeability Hydrocarbon Reservoir——An example from Bei-16 reservoir in Beisantai oilfield

作　　者：梁成钢[1] 刘卫东[1] 石彦[1] 王国先[1] 谢建勇[1] 蔡军[1] 王慧清[1] 

机构地区：[1]中国石油新疆油田分公司准东采油厂,新疆阜康831511

出　　处：《新疆石油地质》2011年第2期153-156,共4页Xinjiang Petroleum Geology

摘　　要：低渗透油气藏的特点决定了注水启动压差大,注入压力高,欠注问题严重。压裂、酸化、超声波等增注措施均存在增注水量少、有效期短的问题。当注水压力达到地层破裂压力时,在注水井附近易形成微裂缝,提高近井地带地层渗透率,而注入水沿裂缝壁快速滤失,裂缝延伸压力下降,致使裂缝延伸的长度与高度有限,对隔层、套管的影响较小。北16低渗透油气藏通过近破裂压力注水,注水量增加,地层压力回升,注水波及体积增大,油井见效明显,预测采收率提高。Low-permeability hydrocarbon reservoir is normally characterized by high starting pressure differential,high injection pressure and serious under injection,etc.Augmented injection measures of injection wells,such as fracturing,acidizing and ultrasonic vibration,mostly have the problems of less incremental water injection rate and short response time.When injection pressure is up to the formation fracture pressure,micro-fractures will produce around injection wells,which can improve the permeability of immediate vicinity of wellbore.Injection water filtrating rapidly along fracture wall and fracture extension pressure decreasing will cause limited length and height of fracture extension and little effect on casing and barriers.By water injection close to fracture pressure at Bei-16 low-permeability reservoir,its water injection rate,formation pressure and waterflood swept area are all enlarged,with obvious response from production wells.The predicted recovery rate can be increased.

关 键 词：准噶尔盆地 低渗透油气藏 破裂压力 注水 微裂缝 隔层 套管 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]