安塞油田井网加密方式研究  

Research of Infill Drilling Modes of Well Patterns in Ansai Oilfield

作　　者：张欢[1] 王小军[1] 王瑞刚[1] 张龙[1] 李新春[1] 

机构地区：[1]中国石油长庆油田分公司第一采油厂

出　　处：《低渗透油气田》2012年第3期68-71,76,共5页

摘　　要：安塞油田长6油藏60％以上的储层渗透率都小于1mD，属于致密油藏，经过近30年的开发已进入中高含水期，适时进行加密调整对油田长期稳产、动用剩余油以及提高采收率具有重要的意义。安塞油田在对基础并网水洗特征、检查井分析、裂缝及剩余油分布规律研究的基础上，开展了局部井网调整和区块整体加密调整。加密方式主要分为孔隙渗流区正方形反九点井网缩小井排距加密、裂缝发育区排状井网缩小排距加密、油井间加密及不规则加密4类。历年加密取得了较好的效果，确保了油田的长期稳产，对采收率的贡献约6％。The permeability of more than 60% Chang6 reservoirs in Ansai oilfield is less than 1 mD, belonging to tight oil reservoirs. This oilfield has entered mid-high water-cut stage after about thirty-year production. Timely infilling adjustment is very significant to achieve long-term stable production, to tap the residual oil and to im- prove recovery efficiency. Based on the characteristics of basic well pattern washing, inspection wells analysis, and studies on the distribution of fractures and residual oil, local well pattern adjustment and the block overall well pattern infill adjustment are carried out in Ansai oilfield. The infill modes are mainly classified into four types, that is, infill by reducing the distance between well rows of square reversed nine-spot pattern in pore percolation zones, infill by reducing the well rows distance in fractures-developed zones, infill between produc- ers, and irregular infill. During the past years infill adjustment was very effective, which ensured long-term sta- isle production and made six percent contribution to the recovery efficiency.

关 键 词：井网 加密 裂缝 剩余油 采收率 

分 类 号：TE348[石油与天然气工程—油气田开发工程]