摘要
注水开发油田在开发中后期,由于注入水的长期冲刷,油藏孔隙结构和物理参数将发生变化,导致在注水井与生产井间可能产生高渗流通道,造成注入水的无效循环。孤南油田131块经过20多年的注水开发,含水率达到97%以上,为了提高水驱油效率,对该区块进行堵水调剖试验。首先利用PI值、FD值对该区块中4个井组进行初选;然后依据灰色关联理论及现场生产实际情况,对比分析了邓氏关联度模型与B型关联度模型,得出B型关联度模型在计算油水井间的动态关联度方面具有显著优势;最后利用B型关联度模型及历史生产数据,计算得出131-2井组关联度最高,选择该井组进行堵水调剖先导试验。试验后该井组累计增油1600t,取得了显著的经济效益,同时该区块的水驱开发效果得到明显改善,并为后期区块整体调剖提供了借鉴和指导。
Because of the long-term erosion of injected water,pore structure and physical parameters of the oil reservoir will change in waterflood oilfield in the middle and later period of development,which results in high-speed flow channel between the water injection wells and production wells and invalid circulation of the injected water.After more than 20 years＇ waterflood,the water cut of block 131 in Gunan oilfield has been above 97%.In order to improve water flooding efficiency ,the experiment of water plugging and profile control was carried out in this block.PI value and FD value was applied to preliminary selection in 4 well groups as the first step;then based on the grey correlation theory and the actual production situation,Deng＇s correlation model and B-type correlation model is compared nificant advantages in terms of calculating the dynamic and analyzed.The B-type correlation model has sig- correlation between the oil well and the water well. Finally, 131-2 well group has the highest correlation through the calculation according to the B-type correla- tion model and historical production data.So this well group should be selected to do pilot test on the water plugging and profile control.After the test,this well group has achieved remarkable economic benefits with the cumulative incremental oil of 1600 tons,and at the same time,the development effect of the water flooding in this block is improved obviously,which will provide reference and guidance for the latter block profile control.
出处
《中外能源》
CAS
2014年第10期47-51,共5页
Sino-Global Energy
关键词
高含水期
堵水调剖
优选方法
PI指数
FD指数
灰色关联
high water cut period
water plugging grey correlation and profile control
optimization method
PI index
FD index
