弱凝胶调驱微观渗流机理研究  

A Study on Microscopic Profiling/Oil Displacing Mechanisms in Weak Gel Flooding

作　　者：赵秀娟 王传军 

机构地区：[1]中国海油渤海石油采油工程技术服务公司,天津塘沽300452 [2]中国海油渤海石油研究院,天津塘沽300452

出　　处：《油田化学》2004年第1期56-60,共5页Oilfield Chemistry

摘　　要：在室温下将透明薄片填石英砂模型用矿化度2g/L的地层水饱和,用粘度38mPa·s的模拟油驱替至饱和剩余水,用地层水驱油至剩余油,再用粘度200mPa·s的HPAM/Cr3+弱凝胶(或对比剂HPAM溶液)驱油,同时用显微摄象仪记录驱替过程。描述了典型的实验现象,归纳出了以下5种弱凝胶驱油机理,给出了相应的摄象图片。①弱凝胶选择性地优先进入大孔道。②弱凝胶使后续液流转向,在绝大多数情况下,小孔隙中的剩余油是被弱凝胶驱动的水(和油)驱出的。③弱凝胶克服贾敏效应驱油,弱凝胶驱使水进入气锁孔隙,逐渐将剩余油驱出。④弱凝胶沿主流道迅速通过后产生"负压力"区,周围孔隙中的剩余油被吸出并汇入油流。⑤驱替前缘油滴汇聚,形成油墙。图1照片15参3。At room temperature, a transparent platelike sand pack model is saturated by a formation water of salinity 2.0 g/L and flooded successively by a model oil of viscosity 38 mPa·s to set saturated residual water, by the formation water to set irreducible oil and by a HPAM/Cr^(3+) weak gel of viscosity 200 mPa·s(or by a HPAM solution in a control experiment) to recovery the residual oil. The microscopic flooding processes are observed and recorded by a microscopic color digital video apparatus. The typical experimental phenomena are described and 5 profiling/oil displacing mechanisms involved in weak gel flooding are presented and demonstrated on video pictures. ① The weak gel enters into wide passages selectively and preferably. ② The weak gel thus diverts the followed fluids and in predominant cases the residual oil is displaced out of small pores by the water (or oil) in front of the gel stream. ③ The weak gel drives the water in place into the pores plugged by gas bubbles and, overcoming Jamin effect, displaces the oil out. ④ The gel stream passes through a big channel at high speed and remains behind some 'negative pressure' zones which attract the dispersed oil from the pores around into oil stream. ⑤ Oil droplets gather together to form oil bank in front of the flooding fluids.

关 键 词：弱凝胶技术 微观模型 调剖技术 驱油技术 多相渗流技术 剩余油 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]