优势渗流通道识别与精确描述  

Identification and accurate description of preponderance flow path

作　　者：王鸣川[1] 石成方[2] 朱维耀[3] 丁乐芳 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油勘探开发研究院,北京100083 [3]北京科技大学土木与环境工程学院,北京100083

出　　处：《油气地质与采收率》2016年第1期79-84,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"剩余油分布综合预测与精细注采结构调整技术"(2011ZX05010-002)

摘　　要：优势渗流通道导致注入水在注采井间低效甚至无效循环,严重影响水驱开发效果,是中高渗透砂岩油藏提高水驱采收率必须解决的关键问题。针对油田生产实际,最大限度挖掘油田生产动态资料,利用渗流理论和数学手段,对优势渗流通道进行识别和描述。根据取心井资料,确定渗流场分区,结合数值模拟技术,识别出注采井间的优势渗流通道;依据无效循环量模型、高速非达西渗流公式和Carman-Kozeny公式,定量描述注采井间优势渗流通道的参数;采用模糊数学理论计算井组内注采井间优势渗流通道参数。以杏六中区P23三角洲前缘厚油层典型井组为例,识别出X21井与X11井、X24井与X13井、X26井与X14井之间存在优势渗流通道,并计算出优势渗流通道的无效循环量、平均孔隙半径和渗透率,与实际情况吻合较好,验证了该方法的准确性。Preponderance flow path(PFP)leads to inefficient cycle,even invalid cycle of injected water between injection and production wells,which seriously affects the effect of waterflooding. This is the key problem to improve waterflooding recovery for middle and high permeability sandstone reservoir. For the actual oil production,the dynamic data were mined in maximum degree,and the seepage theory and mathematical methods were applied in identification and description of the PFP. Based on coring well data,seepage partition was determined and PFP between injection and production wells was identified combined with numerical simulation technology. According to invalid cycle model,high velocity non-Darcy flow equation and Carman-Kozeny equation,the parameters of PFP between injection and production wells were quantitatively described,and those in well pattern were calculated using fuzzy set theory. Taking the typical well pattern of thick oil layer in P23 delta front in the Xingliuzhong area for example,the PFPs between Well X21 and Well X11,Well X24 and Well X13 and Well X26 and Well X14 were identified respectively,and the invalid cycle volume,average pore radius and permeability were calculated,which are in good agreement with the actual,and thus the accuracy of the proposed method is verified.

关 键 词：优势渗流通道 无效循环量 参数计算 高速非达西渗流 砂岩油藏 

分 类 号：TE343[石油与天然气工程—油气田开发工程]