摘要
本文应用微观透明模型实验新技术,模拟枣园油田孔二段油藏水驱开发条件,重点研究了该油藏的水驱残余油形成机理,从微观的角度,提出了微观水驱油方式、孔隙结构、水驱油压力及流度比是影响孔二段油藏水驱残余油形成机理的重要因素,并提出了相应的改善措施。
Based on the geological feature and reservoir characteristics of K_2 forma- tion,Zaoyuan oilfield,three kind of core which have typical porous structure were chosen to make a set of visible micro-model.Seven kind of model were made by means of etching images into glass surface which then are fused toge- ther.Three of them were mimic porous models,and others were composition porous models which reflect the lithological change of K_2 reservoir.A lot of micro displacement are carried out to study the mechanism of residual oil form- ed after water flooding and affecting factors.The results are:(1)There are two displacing types:piston and nonpiston displacement,and the former has a higher displacing efficiency than later.Defferent displacing type intro- duces difference in the distribution of residual oil.(2)Mobility ratio is on im- portant factor in affecting the mechanism of residual oil formed.The larger the mobility ratio,the higher the residual oil satuation due to non piston displacement.(3)In heterogeneous structure,the residual oil is mainly trapp- ed in tight porous group where water is difficult to flood.(4)The residual oil satuation is apparently decreased when pressure gradient of flood is increas- ed.Finally,several suggestions to adjust present flooding well network,to increase the pressure gradient of flooding and improve mobility ratio are pre- sented.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1992年第5期75-80,共6页
Petroleum Exploration and Development
