贾敏效应对低渗透油层有不可忽视的影响  

The obvious influence of Jamin effect on lowpermeability reservoirs.

作　　者：李劲峰[1] 曲志浩[1] 孔令荣[1] 

机构地区：[1]西北大学地质系

出　　处：《石油勘探与开发》1999年第2期93-94,共2页Petroleum Exploration and Development

摘　　要：油藏中的流体作用力按表现形式可分为质量力（重力及浮力等）和表面力（界面张力）。浮力是影响油气运移的重要条件；重力对注水驱油过程作用明显；界面张力则控制了油藏中各种流体的分布，并对油藏剩余油的形成起相当大的作用。低渗透油藏流体渗流是非达西低速渗流，除细微孔隙中的分子力是较重要的作用力之外，实验证明：贾敏效应对低渗透油层也有不可忽视的影响。分析整理４个低渗透油藏（鄯善油田三间房组油组、安塞油田王窑区长６油层、科尔康油田白２块沙海组下段及五号桩油田沙三下Ⅱ油组）的真实微观模型实验结果发现：模型的水驱油排驱压力普遍大于油驱水排驱压力。从理论上讲，在岩石亲水或偏亲水的情况下，油驱水过程（排驱过程）所需压力应当大于水驱油过程（吸入过程）所需压力，但实验结果却恰恰相反。分析认为是贾敏效应的影响所致。同时实验结果还表明：贾敏效应的强弱与储集层岩石物性有明显关系，据此认为渗透率越低贾敏效应越突出。Fluid acting forces on reservoirs can be divided into two categories: mass force (including gravity and buoyancy)and surface force (interfacial). The buoyancy is an important condition for oil (gas) migration; the gravity has strong influence on water flooding; the interfacial tension determines the distribution of oil (gas)specially the remaining oil (gas)in reservoirs. Besides some important effect, such as nonlinear low velocity flood and the molecule effect in micro porous, it is found that the Jamin effect is another important influence on lowpermeability reservoirs. The experiments on micromodel of four lowpermeability reservoirs (Sanjianfang reservoir of Shanshan oil field, Chang 6 reservoir of Ansai oil field, Shahai reservoir in Keerkang oil field and Shahejie reservoir in Wuhaozhuang oil field) proved that: the rejection pressure is higher than the absorbtion pressure in all the oildisplacementby water experiments, but in fact the former should be lower than the latter in waterwet reservoirs according to the oilwater displacement theory. The reason of such results is right because of the Jamin effect. Further experiments result in the conclusion that Jamin effect has a close relationship with the permeability of reservoir, the lower the permeability, the more obviously the Jamin effect.

关 键 词：低渗透油层 贾敏对应 油田开发 渗透率 

分 类 号：TE348[石油与天然气工程—油气田开发工程] TE312