用历届吸水剖面和压降资料确定储层大孔道的方法  

The methods of determining the high capacity channel for the reservoir by successive injection profile and pressure drop curve

作　　者：谢进庄[1] 

机构地区：[1]大庆油田有限责任公司测试技术服务分公司,大庆163453

出　　处：《地球物理学进展》2015年第5期2264-2269,共6页Progress in Geophysics

基　　金：国家科技重大专项"井震结合油藏精细结构表征技术"(2011ZX05010-001)资助

摘　　要：油田由于长期注水开发,储层的渗透能力明显增强,个别储层已形成了大孔道.识别、治理大孔道是油田进入高含水开发阶段主要工作之一.利用压降法分别计算注水井各个时期的储层渗透率,分析其变化趋势,结合历届关井初期地层压降速度和幅度可以判断注水井大孔道.当储层有效渗透率明显增大,关井初期前5 min内降落幅度是全井降落幅度50%以上,且压力导数双对数曲线中期出现凹型时,注水井存在大孔道.对于存在大孔道的注水井,同位素曲线和流量曲线皆显示的主要吸水层就是大孔道层位;同位素曲线显示不吸水,而流量曲线和井温曲线皆显示的主要吸水层也是大孔道层位,需要对这些层位采取调剖措施.该方法为油田下一步措施、实现储层精细注水提供了依据.The permeability of the reservoir has been obviously increasing after the long-term high pressure water injecting.Therefore,the high-capacity channel has been formed in a few reservoirs.Identifying and controlling of the high-capacity channel is one of the main works for the oilfield at the high water cut development stage.The effective permeability of the different injection period is calculated with the pressure drop method.Whether or not the high-capacity channel existing is judged by investigating the change trend of the effective permeability and the successive velocity and amplitude of pressure drop at the beginning of shut-in.The high-capacity channel exist when the effective permeability is obviously increased,and the amplitude of pressure drop within 5min at the beginning of shut-in is more than 50%than the whole well＇s,and concave shape appears in the double logarithm pressure derivative curve.For injection wells that the high-capacity channel exists,the main absorbing water layer in the isotopic curve and the temperature curve is the high-capacity channel.The main absorbing water layer in the flow curve and the temperature curve and no absorbing water layer in the isotopic curve is also the high-capacity channel,therefore the injection profile modification is also needed.The method provides a basis for the oilfield taking the next step and the fine water injection.

关 键 词：注水井 吸水剖面 压降曲线 渗透率 储层 大孔道 

分 类 号：P631[天文地球—地质矿产勘探]