裂缝性特低渗透储层渗吸表征模型  

Scaling Model of Imbibition in Fractured Ultra-Low Permeability Reservoir

作　　者：周林波[1] 程林松[1] 曾保全[1] 

机构地区：[1]中国石油大学(北京)石油天然气工程学院,北京昌平102249

出　　处：《石油钻探技术》2010年第3期83-86,共4页Petroleum Drilling Techniques

基　　金：国家自然科学基金项目"西部深层变形介质复杂油气非线性渗流模型"(编号:90210019);教育部新世纪优秀人才支持计划(批准号:NCET-05-0108)资助

摘　　要：特低渗透储层微裂缝发育,开发过程中渗吸作用明显,准确表征渗吸速度对合理开发该类储层具有重要意义。从两相渗流基本理论出发,考虑毛细管力和重力,岩石的孔隙度、渗透率、特征尺寸,及油水黏度等因素的影响,建立了无因次渗吸速度表征模型。利用该模型可以预测裂缝性特低渗透储层的渗吸采油规律。利用自主设计的渗吸试验装置,选取吉林油田和长庆油田的特低渗透岩心进行渗吸试验,对比不同渗吸速度模型对试验数据的表征结果可以看出,新模型实现了不同岩心渗吸速度的一致拟合,表征结果正确可靠。试验结果同时表明,所选取特低渗岩心的渗吸采收率约为10%-18%,且基质渗透率和油水界面张力对渗吸速度和渗吸采收率均有明显影响。因此充分发挥裂缝性油藏的渗吸作用,可以有效改善裂缝性特低渗储层的开发效果。In the development of ultra-low permeability reservoirs,imbibition is obvious,therefore accurately describing the scaling imbibition is important for development this type of reservoirs.Based on the seepage theory,the non-dimensional imbibition speed model was developed considering the impact of capillary force,gravity,porosity,permeability,viscosity,feature size.This model can be used to predict the regular pattern of imbibition oil recovery in fractured ultra-low permeable reservoir.Using self-designed experimental imbibition device,the scaling imbibition experiments were conducted using low permeability cores from Jilin and Changqing oilfields.The results from this new model agree with the experiments results.Experimental results showed that the fractured reservoir imbibition recovery of about 10%~18% and matrix permeability and oil-water interfacial tension exert significant effect on imbibition recovery.Therefore,consideration the impact of imbibition on the low permeability fractured reservoir can improve the development efficiency.

关 键 词：裂缝性储集层 低渗透储集层 自发渗吸 渗吸速度 数学模型 实验室试验 

分 类 号：TE312[石油与天然气工程—油气田开发工程]