摘要
储层速敏伤害存在于油气田开发和生产中,其伤害机理为微粒运移,从力学理论上分析,当作用在微粒上的水动力大于范德华力与双电层力之和时,就会使微粒脱离、释放、运移,对储层造成伤害。水动力大小与流速成正比,临界流速是速敏性伤害的一个标志。因此储层中可运移的微粒不仅仅是粘土矿物微粒,还包括石英、长石等非粘土矿物微粒。速敏性造成的伤害是不可恢复的。
The damage of velocitysensitivity usually takes place in the process of the development and production of an oil/gas field. It results from the mobilization of particle fines. As far as the forces acting on fines are concerned, the hydrodynamic and colloid forces between fine particle and sand grain surfaces are analyzed to determine the criteria for mobilization of fines. When the hydrodynamic forces are bigger than the colloid forces (van der Waals attractive forces and the double layer repulsive forces), a fine particle attached to the surface of a sand grain will be separated and transported through the porous formation, then trapped at pore constrictions, thereby reducing the permeability of the formation. In a given reservoir, the hydrodynamic forces depend directly on fluid velocity. The critical velocity is an important parameter of velocitysensitivity. Meanwhile, the authors infer that these finegained particles are commonly small particles of quartz and /or clays or nonclays. The damage caused by velocitysensitivity is usually irrecoverable.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第5期501-504,共4页
Journal of Chengdu University of Technology: Science & Technology Edition
关键词
速敏
微粒运移
水动力
临界流速
velocity-sensitivity
mobilization of fines
hydrodynamic forces
critical velocity
