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大庆油田井网加密调整效果及其发展趋势 被引量:7

Effect and trend of well pattern infillings in Daqing Oilfield
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摘要 为了明确大庆油田历次井网加密调整效果,以调整后5~10 a内的取心井资料为依据,分析各类油层见水厚度比例、水洗厚度比例及驱油效率变化规律。结果表明:基础井网使有效厚度大于2.0 m的油层得到有效动用,见水厚度比例达75.8%;一次加密井网调整使有效厚度为2.0 m及以下的各类油层见水厚度比例得到大幅度提高,有效厚度为0.5~2.0 m的油层见水厚度比例增幅为195.0%~264.4%,表外油层也得到了有效动用;二次加密井网调整使有效厚度为0~1.0 m的油层见水厚度比例进一步提高近50.0%;三次加密井网调整并未明显提高油层见水厚度比例,薄差油层的见水厚度比例增幅小于2.3%,井网加密调整效果逐渐变差。层间非均质性强、生产井段跨度大和层间含水率差异变小是薄差油层见水厚度比例低和历次井网加密调整效果变差的重要因素,进而提出了缩短生产井段与缩小井距并重的井网加密调整模式。 To clarify the effect of previous well pattern infillings of Daqing Oilfield,this paper analyzed changes in the wa⁃ter-breakthrough thickness ratio,water-washing thickness ratio,and oil displacement efficiency of various oil layers on the basis of cored well data obtained 5-10 years after the adjustments.The result shows that the basic well pattern enabled the effective producing of oil layers with an effective thickness above 2.0 m,and the water-breakthrough thickness ratio reached 75.8%.The primary well pattern infilling significantly improved the water-breakthrough thickness ratio of oil lay⁃ers with effective thicknesses of 2.0 m or less,and the water-breakthrough thickness ratio with effective thicknesses of 0.5-2.0 m increased by 195.0%~264.4%,thus the untabulated oil layers effectively produced well too.The secondary infilling further improved the water-breakthrough thickness ratio of oil layers with effective thicknesses between 0-1.0 m by nearly 50.0%.The tertiary infilling did not improve the water-breakthrough thickness ratio of the oil layers considerably,the wa⁃ter-breakthrough thickness ratio of the thin and poor oil layers increased no more than 2.3%,which represented the gradu⁃ally worsening effect of well pattern infilling.The high interlayer heterogeneity,the large producing zone,and the decreas⁃ing interlayer water cut difference are key factors for the low water-breakthrough thickness ratio of the thin and poor oil lay⁃ers and the worsening effect of previous infillings.According to the analysis above,a well pattern infilling mode that equally emphasizes the reduction of producing section length and well spacing was proposed.
作者 赵秀娟 吴家文 左松林 杨文武 戢红霞 孟妍 王贺军 ZHAO Xiujuan;WU Jiawen;ZUO Songlin;YANG Wenwu;JI Hongxia;MENG Yan;WANG Hejun(Research Institute of Exploration and Development,Daqing Oilfield Company Ltd.,PetroChina,Daqing City,Heilongjiang Province,163712,China)
出处 《油气地质与采收率》 CAS CSCD 北大核心 2022年第5期141-146,共6页 Petroleum Geology and Recovery Efficiency
基金 中国石油重大科技专项“高/特高含水油田改善水驱关键技术”(2019B-12)。
关键词 井网加密 动用程度 水洗厚度比例 驱油效率 大庆油田 well pattern infilling producing degree water-washing thickness ratio oil displacement efficiency Daqing Oilfield
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