摘要
低渗透强水敏储层具有喉道细小和地层微粒易分散运移的特点。对这类储层进行注水开发时,处理剂的选择要求较常规储层高。针对上述特点,提出了适合这类储层防膨剂的筛选方法,即静态与动态相结合的实验评价方法,静态主要评价防膨剂的防膨率,动态主要评价防膨剂的稳定性与持久性。以大港油田张东地区沙三段低渗透强水敏储层防膨剂筛选为例,说明了静态与动态相结合实验评价方法的操作流程,同时运用该方法从6种现有防膨剂中优选出FP-1用于该区注水开发。对于质量分数为1%的FP-1防膨剂,静态评价离心法防膨率为85%,X-射线衍射法防膨率为53.2%,膨胀仪法膨胀率为0.66%,动态评价渗透率保留率大于55%,且渗透率波动范围小,防膨效果稳定。在应用过程中发现,静态评价方法中的膨胀仪法和衍射法与动态评价结果一致性好。
Low permeability and strong water sensitivity reservoir has the characters of tiny throats and formation fines migration.Optimiza- tion of clay inhibitor for waterflooding in these reservoirs will call for more than in normal reservoirs.In view of this,experiment e- valuation method with the combination of static and dynamic state was put forward,which is the optimization of clay inhibitor for this type of reservoirs.Static method was mainly used to eval- uate the rate of anti-swelling,while dynamic method was mainly used to estimate the stability and continuity of the clay inhibitor. Through its optimization of clay inhibitor for low permeability and strong water sensitivity reservoirs in Es_3 Zhangdong area,Dagang Oilfield,the working program was presented.Clay inhibitor FP- 1 was optimized for waterflooding in this area from six clay inhib- itors.When using FP-1with 1% mass fraction,the anti-swelling rate is 85%,53.2% and 0.66% respectively by static evalua- tion centrifugal method,X-ray diffraction method and expansion method.The antiswelling effect is stable with reserve rate more than 55% of permeability by dynamic evaluation and small range of permeability change.When the multiple methods were used for optimization of clay inhibitor,it was found that the expansion method and diffraction method among static evaluation have the same results with the dynamic evaluation method.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2008年第4期97-99,共3页
Petroleum Geology and Recovery Efficiency
关键词
低渗透油藏
强水敏
防膨剂
筛选
防膨率
low permeability reservoir
strong water sensitivity
inhibitor
optimization
antiswelling rate
