基于模糊数学的海上稠油热采效果评价研究及应用

摘要

针对海上稠油热采评价体系"九参数法"内部指标具有复杂相关性的问题,通过评价指标无因次化得到"六参数法",采用模糊数学方法评价"六参数法"指标权重,得到海上热采开发效果定量判断公式及分级标准.将该成果应用于南堡35-2油田南区B31井,第2周期热采自喷期延长76 d,自喷阶段增油1822.7 m3.研究成果对海上稠油多周期吞吐的热采方案优化及延长自喷期有重要意义.%A"six-parameter"evaluation is proposed by parameter normalization to replace the"nine-parameter"evaluation with complex correlations between the internal parameters for the thermal recovery performance evaluation of offshore heavy-oil reservoir. Fuzzy mathematics is used to determine the different weights in"six-parameter"e-valuation. A judgment equation and classification criteria are gained to quantitatively evaluate the thermal recovery performance in offshore heavy-oil reservoir.This method is applied to the Well B31 in the southern area of Nanpu35-2 Oilfield. The flowing period of thermal recovery in the second period extents to 76 d and the corresponding oil increment in the flowing period is 1 822.7 m3. This research is of great significance to the optimization of thermal recovery program and the extension of flowing period in offshore oil reservoir.