摘要
低渗透断块油藏储量丰度小,渗透率较低,存在启动压力梯度,很难建立有效的驱替压差,而且含油面积小、形状复杂,很多属于典型的窄条状油藏,难以形成规则的注水井网,后期井网调整困难,需要一次布井成功,所以注采井距一定要选取合理。采用油藏实际岩心,通过物理模拟实验,得到了低渗透油藏的启动压力参数;利用实验结果,通过理论分析和数值模拟计算,重点研究了启动压力梯度和储层条件等对有效井距、合理井距和井网形式的影响。提出了首先将物理模拟实验、油藏工程理论推导和数值模拟计算相结合,计算得到低渗透断块油藏的合理注采井距,然后在此基础上进行合理井网部署的方法。研究结果应用于油田实际区块的井网部署中,取得了较好的开发效果,与同类油藏相比采收率可提高1.86%～2.6%。
Because of low reserves abundance,low permeability,starting pressure gradient,it is very hard to establish effective displacement pressure system for the low permeability and fault block reservoir.And,because of small oil area,complex shape,belonging to narrowband oil field,it is also very hard to implement regular well pattern and adjustment in later stage.Therefore,it needs to deploy wells successfully in the beginning and it must select reasonable spacing for the low permeability and fault block reservoir.Using the drilling cores of oil field,and by means of physical simulation experiment,we measure the starting pressure parameter.With laboratory findings,theoretical analysis and numerical simulation,we study the effect on effective spacing,rational spacing,and well pattern of starting pressure gradient and reservoir conditions.Combined with physical simulation experiment,reservoir engineering theory derivation and numerical simulation,we propose one method to calculate reasonable spacing and dispose well pattern suitable in low permeability and fault block reservoir.The study results are applied to actual oil field and obtained good development performance.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2011年第6期94-96,117,共3页
Petroleum Geology and Recovery Efficiency
基金
中国海洋石油总公司"十一五"科研课题"海上三低油田开发关键技术评价研究"(2008YXKJB-02)
关键词
低渗透
断块油藏
注采井距
启动压力梯度
井网部署
low permeability
fault block reservoir
well spacing
starting pressure gradient
well pattern deployment
