胜利油田聚合物驱矿场效果影响因素研究

RESEARCH ON INFLUENCE FACTORS OF POLYMER FLOODING IN SHENG LI OILFIELD

胜利油田实施聚合物驱的规模大 ,各单元都已取得了明显的降水增油效果 ,但各单元的见效特点存在差异。通过采用室内物理模拟、数值模拟和矿场实施跟踪等手段 ,研究了流体粘度、注采情况、注入时机和油藏储层对聚合物驱效果的影响。结果表明 :地层聚合物溶液与原油粘度比越高 ,聚合物驱效果越好 ;聚合物用量越大提高采收率越高 ;在中高含水期 ,转注越早 ,聚合物驱效果越好 ;聚合物驱有利相带依次为河道边缘相 >河道充填相 >心滩 >泛滥平原相 ;正韵律聚合物驱有利 ,而反韵律不利于聚合物驱 。

Polymer flooding has been carried out on large scale in Shengli oilfield, and the watercut declines remarkably, but the response characteristics vary in different parts. Influence of fluid viscosity, injection and production condition, injection timing and reservoir property on polymer flooding is studied on the basis of laboratory modeling, numerical simulation and pilot test in oilfield. The results show that: (1) The higher ratio of polymer solution to oil viscosity in situ, the higher efficiency of the polymer flooding, the more the polymer injected, the higher the recovery rate increased, the earlier production well conversion, the higher the polymer flooding efficiency in middle/high watercut period. (2) The facies belts which are favorable to polymer flooding are channel marginal facies, channel fill facies, channel bar and flood plain facies in turn. (3) The positive rhythm is suitable to polymer flooding and the negative is not. Besides, large channel reservoir should be avoided when polymerflooding areas are selected.