摘要
针对目前常用水驱曲线合理直线段的选择容易出现多解性,导致预测结果不确定的问题,通过对丙型水驱曲线求导,提出了含水率与累计油液比平方的关系式。研究表明:在稳定水驱条件下,含水率与累计油液比平方值呈直线变化,且在理论上,其斜率的绝对值等于丙型水驱曲线的截距,以此为基础,提出了确定稳定水驱直线段的辅助方法。应用实例表明,通过分析含水率与累计油液比之间的直线关系,能够快速评价稳定水驱阶段,进而实现水驱曲线合理直线段的快速选择,预测结果更加贴近油田实际。该方法为同类型油藏水驱曲线直线段合理性的判断提供了借鉴。
The identification of reasonable linear segment in waterflooding curve is usually prone to multiple solutions,which will result in uncertain forecast. An equation between water-cut and square cumulative oil-liquid ratio is proposed by deriving Type-C waterflooding curve. Research shows that there is a linear correlation between water-cut and square cumulative oil-liquid ratio under steady waterflooding. Theoretically,the absolute value of the slope is equal to the intercept of Type-C waterflooding curve. Based on the above research,a new assistant method is proposed to identify the linear segment in waterflooding curve. Field application indicates that the linear correlation between water- cut and square cumulative oil- liquid ratio could efficiently identify steady waterflooding stage and linear segment in waterflooding curve,which could gain more realistic forecast. This research could provide certain references for the identification of linear segment in similar oil reservoirs.
出处
《特种油气藏》
CAS
CSCD
北大核心
2016年第5期86-88,共3页
Special Oil & Gas Reservoirs
基金
国家科技重大专项"大型油气田及煤层气开发"子课题"海上油田丛式井网整体加密及综合调整油藏工程技术应用研究"(2011ZX05024-002-007)
关键词
水驱曲线
丙型曲线
稳定水驱
直线段
采收率
waterflooding curve
Type-C waterflooding curve
steady waterflooding
linear segment
recovery factor
