摘要
储层打开后，由于原地应力平衡的破坏，井眼周围应力将重新分布。当储层胶结强度较低时，近井带存在塑性区。由于塑性区的存在和钻井过程中泥浆滤液及固相颗粒侵入的双重作用使近井带的渗透率很低，并将地层分为具有不同渗透率的三个带，即损害带（含塑性作用）、塑性带和弹性带。在测试、生产过程中由于地层流体的流入将增大塑性带宽度，从而加剧对储层的损害。临界流量与损害带的渗透率、地层的胶结强度成正比，与产出流体的粘度成反比。塑性带的宽度随流量的增加而增加。
The stress around a hole will re-distribute after the hole has been drilled, due to the loss of original stress balance, There exists a plastic zone around hole for the poorly consolidated sand formation, The zone near well bore gas the lowest permeability because of the invasion of drilling fluid, solid particles. and the influence of plastic deformation, There exist three different permeabilityzones around wellbore, damaged zone having plastic feature, plastic zone, and elastic zone. The plastic zone will extend for width when the fluid flows into the well, and cause formation damage aggravation. The critical flow rate depends On the permeability of damaged zone, formation consolidation and the viscosity Of formation fluid.
出处
《西南石油学院学报》
CSCD
1998年第1期11-15,20,共6页
Journal of Southwest Petroleum Institute
关键词
应力场
应力分析
地层损害
钻井
储层
Elastoplasticity
Stress field
Stress analysis
critical velocity
Permeability
Formation damage
