汪艳勇,魏建光,叶鹏,夏丹,张栋,钟连彬,王广,丁玉敬,胡霞
Wang Yanyong,Wei Jianguang,Ye Peng,Xia Dan,Zhang Dong,Zhong Lianbin,Wang Guang,Ding Yujing,Hu Xia

• 1:东北石油大学提高油气采收率教育部重点实验室
• 2:中国石油大庆油田有限责任公司新能源事业部
• 3:中国石油大庆油田有限责任公司提高采收率项目经理部
• 4:中国石油大庆油田有限责任公司勘探开发研究院

摘要(Abstract)：

大庆油田三类油层储层发育更差、非均质性更强，造成化学驱开发效果变差。为了提高化学驱开发方案的设计精度，引入化学剂可及孔隙体积校正因子，通过定量计算储层、井组、区块的化学剂可及孔隙体积，并利用物模实验与数值模拟技术开展了改进化学驱可及孔隙体积系数精细计算方法研究，从渗透率、层系组合、平面砂体相变3方面得出化学剂可及孔隙体积校正因子，形成了化学剂可及孔隙体积校正因子与渗透率、渗透率级差、相变条件的关系图版，建立了化学驱可及孔隙体积系数计算新方法，并应用于矿场实践。结果表明：渗透率越高，可及孔隙体积校正因子越大；渗透率级差越小，层间可及孔隙体积校正因子越大；当注入井沉积相相同且采出井处于河道砂、主体席状砂、非主体席状砂、表外储层时，对应的平面可及孔隙体积校正因子依次下降；随着化学驱可及孔隙体积系数的增加，低含水率见效期延长、含水率下降幅度增大、含水率回升速度减缓。利用该方法计算的化学驱可及孔隙体积系数更符合油藏实际，可为化学驱油藏工程方案设计提供更准确的定量指标，对于化学驱开发方案设计具有重要的指导意义。
Class Ⅲ reservoirs in Daqing Oilfield have poorer development and higher heterogeneity, resulting in worse development effect of chemical flooding. In order to improve the design accuracy of chemical flooding development plans, the chemical-agent accessible pore volume correction factor is introduced. Based on quantitative calculation of chemical-agent accessible pore volume of reservoirs, well patterns and blocks, an improved method for calculating the chemical-flooding accessible pore volume coefficients is developed using physical simulation experiments and numerical simulation techniques. From 3 aspects of permeability, strata series combination and areal sand bodies phase transition, the chemical-agent accessible pore volume correction factors are obtained to form relationship charts between correction factors for chemical-agent accessible pore volume vs. permeability, permeability contrasts and phase change conditions. A new method for calculating chemical-flooding accessible pore volume coefficient is established and applied in field practice. The results show that the higher the permeability is, the larger the correction factor for accessible pore volume is. The smaller the permeability contrast is, the larger the correction factor for interlayer accessible pore volume is. When sedimentary facies of the injector are the same and the producer is in the river channel sand, main sheet sand, non-main sheet sand and untabulated reservoirs, the corresponding correction factors for areal accessible pore volume decrease sequentially. With the increase of chemical-flooding accessible pore volume coefficients, low water-cut response period of is prolonged, the decrease of water cut increases and the rising rate slows down. Chemical-flooding accessible pore volume coefficients calculated by this method are more coincident with the actual reservoir situation, which provides more accurate quantitative indexs for the design of chemical flooding reservoir engineering schemes and has important guiding significance for the design of chemical flooding development schemes.

关键词(KeyWords)： 三类油层;化学驱;可及孔隙体积系数;可及孔隙体积校正因子;大庆油田
Class Ⅲ reservoirs;chemical flooding;accessible pore volume coefficient;accessible pore volume correction factor;Daqing Oilfield

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“中高渗油田特高含水期大幅度提高采收率技术研究”（2023ZZ22）

作者(Author): 汪艳勇,魏建光,叶鹏,夏丹,张栋,钟连彬,王广,丁玉敬,胡霞
Wang Yanyong,Wei Jianguang,Ye Peng,Xia Dan,Zhang Dong,Zhong Lianbin,Wang Guang,Ding Yujing,Hu Xia

DOI: 10.19597/J.ISSN.1000-3754.202501008

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