摘要
采用水平井与直井相结合的开发方式,在近边水区布置1口水平井,利用数值模拟方法,研究了边水油藏水平井注泡沫挡水技术。当边水入侵,水平井含水率达到一定程度时,利用高压向水平井中注入氮气泡沫并形成泡沫带,延缓边水的再次入侵。模拟结果表明,直井注泡沫会造成边水绕流,不能有效挡水,而水平井注泡沫则可以形成1条狭长的泡沫带,有效阻挡边水入侵。通过正交设计法对水平井无因次避水距离,无因次垂向深度以及无因次长度优化后,最优方案与不采取挡水措施相比4周期可累计增油1.55×104m3。通过在边水入侵区域加入1条高渗带的方法对非均质边水油藏水平井注泡沫的可行性进行了研究,模拟结果表明,泡沫可以很好地发挥调堵功能,使水侵剖面更加均匀,有效改善边水油藏开发效果。
The paper presents the study on water-blocking technology by using foam in a horizontal well placed near edge water by means of numerical simulation for the development mechanism of the combination of vertical wells and horizontal wells.When edge water invasion occurs and water cut reaches a certain level,nitrogen foam is injected into the horizontal well under high pressure to delay water invasion.The study shows that foam injected in a vertical well can't effectively block edge water invasion due to around flow and however foam injected in a horizontal well can effectively block edge water invasion because foam injected in a horizontal well can form a narrow foam belt.Dimensionless distance between edge water and horizontal well,dimensionless vertical distance and dimensionless length of a horizontal well are optimized by the orthogonal design method.As a result,the optimized scenario can get a production gain by 1.55×104m3 within 4 periods compared with a case in which water blocking measures are not taken.The feasibility of injecting foam in a heterogeneous edge-water reservoir is studied by adding a high permeability zone in the reservoir.The simulation result shows that foam can effectively block water invasion,can make water invasion profile more uniform and can effectively improve the development of the reservoirs with edge water.
出处
《特种油气藏》
CAS
CSCD
北大核心
2013年第1期139-142,158,共4页
Special Oil & Gas Reservoirs
基金
国家科技重大专项"油田开采后期提高采收率新技术"(2011ZX05009-004)
关键词
氮气泡沫
边水油藏
水平井
数值模拟
正交设计
nitrogen foam
oil reservoir with edge water
horizontal well
numerical simulation
orthogonal design
