【摘要】 压裂是开发致密气储层的主要方法,但同时也会对储层造成伤害。为了定量分析压裂伤害效果,对致密气储层开展X射线衍射、扫描电镜、恒速压汞、核磁共振及岩心流动实验研究。结果表明:岩心黏土矿物含量较高,黏土矿物达16. 75%,易运移和膨胀,产生水敏伤害。孔隙不发育,孔喉连通性差,大孔隙被小喉道控制。水敏伤害不会随着反排PV数的增加而得到解除,随着挤入液量的增加,水敏伤害增大。水锁伤害随着反排PV数的增加可以得到解除,在反排初期水敏和水锁伤害为主要伤害;在反排后期,岩心水敏伤害为主要伤害。更多还原

【Abstract】 Fracturing is the main method to develop tight gas reservoir,but it can also cause damage to reservoir. In order to quantitatively analyze the effect of fracturing injury,X ray diffraction,scanning electron microscopy,constant velocity mercury injection,nuclear magnetic resonance( NMR) and core flow experiments were carried out on tight gas reservoirs. The results show that the clay mineral content of the core is higher than that of the clay minerals,which is 16. 75%. It is easy to transport and swell,and cause water sensitivity damage. The pore is not developed,and the pore throat connectivity is poor,large pores are controlled by small throat. Water sensitive damage does not increase with the number of anti PV release,with the increase in the amount of liquid,water sensitive damage increased; water locking damage increased with the increase of anti PV number can be released. At the early stage of gas back row,water sensitivity and water lock damage as the main injury; at the later stage of anti later,core water sensitivity damage is the main damage.更多还原