晶体习性、光泽、颜色、条痕、解理、裂理、荧光、磷光、比重和磁性。
Crystal habit, luster, color, streak, cleavage, fracture, fluorescence, phosphorescence, specific gravity and magnetism.
第二，单流阀效应引起孔隙压力下降，割理闭合，导致侵入的压裂液滞留其中。
The second is unilateral flow bring about the pore press lower, cleats close, and fracturing fluid deeped in it will settle.
这一处理方法起到延缓裂纹扩展、抑制起裂的效果。
This treatment has an effect on delaying the crack extension and hence suppressing its cracking.
讨论了伤害煤层渗透率的两大因素：压裂液堵塞煤层割理；煤基质吸附压裂液而膨胀。
Blockage of coal seams by fracturing fluids (FFs) and swelling of coal matrix owing to FF adsorption are discussed and considered to be the basic factors for coalbed permeability damage.
讨论了伤害煤层渗透率的两大因素：压裂液堵塞煤层割理；煤基质吸附压裂液而膨胀。
Blockage of coal seams by fracturing fluids (FFs) and swelling of coal matrix owing to FF adsorption are discussed and considered to be the basic factors for coalbed permeability damage.
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