薄层底水油藏底水锥进控制可视化研究

Visual studies on controllii water coning in thin oil reservoir with bottom water

关键词:  堵水  底水锥进  薄层底水油藏  选择性堵剂  可视化物理模拟

Key words:  water shutoff  bottom water coning  thin oil reservoir with bottom water  selective blocking agent  visual physical analogy

摘要:

常规底水油藏采用射孔建立底水隔板控制底水锥进。针对薄层底水油藏的底水锥进提出了不射孔建立底水 隔板的方法。该方法通过冻胶型选择性堵剂的选择性注人和由工作液与原油的密度差而产生的重力分异作用形成 隔板，控制底水锥进。在隔板建立中,选择性堵剂、高密度盐水和过顶替液起了重要作用。通过可视化物理模拟形 象直观地表达了薄层底水油藏不射孔建立底水隔板控制底水锥进的过程。现场应用证明，该方法可以解决陆梁油 田的薄层底水油藏底水锥进问题。

Abstract:

A common technique of controlling water coning in oil reservoir with bottom water is to build up barrier by perforating and setting packer. A new technique was proposed to build up gel barrier without perforation to control water coning in thin oil reservoir with bottom water. This technique takes fully advantage of selective plugging effect of gel blocking agent and gravity segregation resulted from density contrast of oil and water, and could control water coning by gel barrier in vicinity of oil-water interface. Three types of operating fluids including high-denshy brine, selective blocking agent and over-displacing fluid are important to build up barrier. The progress of building up gel barrier without perforation to control water coning is shown visually and directly in visual physical analogy experiment. The results of field experiments confirm that the technique is effective for controlling water coning of thin oil reservoir with bottom water in Luliang Oilfield.