渤海油区提高采收率技术油藏适应性及聚合物驱可行性研究

Research on reservoir potential and polymer flooding feasibility for EOR Technology in Bohai offshore Oilfield

不同的油藏地质和开发条件,提高原油采收率技术的适应性有所不同。渤海油区属于常规稠油油藏,目前常规水驱采收率不高,寻求新的开发方式提高其采收率意义重大。针对渤海油区的油藏特征,与中外提高采收率油藏筛选标准和已实施提高采收率区块油藏条件进行对比,研究了渤海油区各类提高采收率技术的适应性和可行性,适宜聚合物驱的油藏有20个,石油地质储量占83.54%;应用层次分析和蒙特卡罗模拟法,研究了海上油田聚合物驱的油藏分类和应用潜力。研究结果表明,渤海油区聚合物驱条件较好的Ⅰ类和Ⅱ类油藏分别为5和8个,对应所占石油地质储量分别为26.0%和65.2%,聚合物驱具有良好的技术潜力和经济效益。在渤海油区SZ36-1,LD10-1和JZ9-3等3个油田的24口井实施聚合物驱的试验结果证实了聚合物驱具有良好的降水增油效果。

Different types of oilfields have different geological characteristics and development conditions,thus,the suitable EOR methods and technologies are also quietly different. Bohai Oiffield is mainly developed offshore ordinary heavy reservoirs. Currently,the recovery efficiency of these heavy reservoirs with waterflooding is quite low,so it is significant to seek a new method to enhance recovery efficiency. Based on the comprehensive investigation on the application status of EOR technologies both abroad and at home,and combined the practice and experiences from pilot tests with geological characteristics and development conditions of Bohai Oilfield,feasibility of each type of EOR method in Bohai Oilffield was researched. There are 20 oil reservoirs suitable to polymer flooding,accounting for 83.54% of the total reserve. Multi-layer categorization method and Monte Carlo principle were applied to the research of reservoir classification and potential evaluation of polymer flooding. There are 5 and 8 of the first and second type polymer reservoirs,whose reserves are accounting for 26.0% and 65.2% respectively. The technology of polymer flooding has good application potential and perspective. Field application also proved good result of the poly-mer flooding.