特低渗透油藏多层合采评价新指标  

New evaluation indicators of commingled production for ultra-low permeability reservoirs

作　　者：徐庆岩[1] 蒋文文[2] 林伟 张磊[4] 魏林果 杨正明[6] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国专利信息中心,北京100088 [3]中国石油渤海钻探第三钻井公司,天津300280 [4]中国石化华东分公司采油厂,江苏泰州225300 [5]中国石油塔里木油田分公司规划计划处,新疆库尔勒841000 [6]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《石油与天然气地质》2015年第6期1016-1021,共6页Oil & Gas Geology

基　　金：国家油气重大专项(2011ZX0513-006)

摘　　要：针对特低渗透多层油藏的层间非均质性和流体的非线性渗流特征,采用天然露头平板大模型并联驱替的物理模拟方法和非线性渗流数值模拟软件,对特低渗透多层油藏合采的开发效果进行研究。结果表明,特低渗透油藏多层合采时的总体采出程度与渗透率级差、平均渗透率、开发层数和地层油粘度均有关系。渗透率级差越大,总体采出程度越低,相对高渗层与相对低渗层的采出程度差值越大;平均渗透率越高,总体采出程度越高;开发层数越多,地层油粘度越大,多层合采时的开发效果越差。在此基础上,提出了"四元综合影响因子"的概念来评价多层合采的开发界限。计算分析表明,多层合采的综合采出程度与四元综合影响因子呈幂函数递减关系,"四元综合影响因子"可以作为评价多层油藏开发效果的重要指标。Considering the vertical heterogeneity characteristics of multilayer reservoirs and nonlinear seepage regularity for fluid flowing in the ultra-low permeability reservoirs,natural large-scale outcrop model and nonlinear seepage numerical simulation software were adopted to research the development effect of commingled production for ultra-low permeability reservoirs. Results show that total recovery percent is influenced by permeability ratio,average permeability,layer number and oil viscosity during commingled production. With the increase of permeability ratio,the total recovery percent decreases and the difference between the higher and the lower permeability layers becomes larger; And the higher the average permeability is,the higher total recovery percent is; the more the layer number is and the higher the oil viscosity is,the poorer the develoipment effect is during commingled production. On this basis,a new parameter called ＂quadelement synthetic influence factor＂is proposed to evaluate the development boundary for the commingled production of multilayer reservoir. Analysis indicates that the total recovery percent is in a power function relationship with this new parameter,which could be used as an important indicator for development effect evaluation of ultra-low permeability multilayer reservoir.

关 键 词：四元综合影响因子 非线性渗流 数值模拟 物理模拟 多层油藏 特低渗透油藏 

分 类 号：TE348[石油与天然气工程—油气田开发工程]