单井缝洞单元注水替油开发中的油水关系分析  

Oil-Water Relationship During Water Injection in the Single Well Fracture-Cave Unit

作　　者：王庆魁[1] 陆正元 钟伟[1] 杨敏[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059

出　　处：《桂林工学院学报》2008年第2期179-183,共5页Journal of Guilin University of Technology

基　　金：中国石油化工股份有限公司项目(KS2005-065)

摘　　要：塔河油田奥陶系碳酸盐岩油藏以缝洞单元为开发单位,缝洞单元具有地下储集空间相对较小和流动性能较好的特征。单井缝洞单元注水替油开发可以划分为基本不产水和高含水2个阶段。单井缝洞单元油水产出能量主要依靠原油自身弹性膨胀,油井注水可以等效于常规油藏开发中的边部注水增加油藏能量,注入水进入缝洞单元底部抬升了缝洞单元的油水界面。井孔储层深度与缝洞单元油水界面之间的储集空间(剩余存水空间)体积大小决定了注水替油的开发效果好坏,单井注水替油可以开发井孔储层深度下方的油体,建议井孔储层深度上方的油体通过注气或侧钻等措施来开采。Fracture-cave unit in Ordovician carbonate reservoir in Tahe Oilfield is believed as the basic developing unit,which has two marked characteristics： reservoir space is relatively small and a better mobility.The performance during water injection in the typical single well fracture-cave unit can be divided into the pure oil production stage and the water production stage.The energy of oil and water production is the expansion of oil in the fracture-cave unit.According to the oil-water relationship analysis in the water injection unit,it is concluded that single well water injection is equal to energy by water injection at boundary in the exploiting of the ordinary reservoir to raise the oilwater contact.The reservoir volume between wellhole reservoir and oilwater contact is the key factor which decides the developing effect of single well water injection.The oil under the wellhole reservoir can be recovered by single well water injection,but the oil above the wellhole reservoir can be recovered by gas injection or sidetrack drilling.

关 键 词：碳酸盐岩 缝洞单元 注水 油水关系 

分 类 号：TE344[石油与天然气工程—油气田开发工程]