低温下硫酸钠溶液对原煤损伤试验研究

Experimental Study on Damage of Sodium Sulfate Solution to Raw Coal at Low Temperature

参考已有关于液氮作为压裂液在储层改造中的成功应用和低温冻结对岩石的损伤的研究,结合硫酸钠等盐溶液在冻融循环过程后能加剧对岩石的损伤。依托核磁共振测试技术,重点研究了低温作用下不同浓度的硫酸钠溶液作为煤岩体的饱和液体对煤岩体产生损伤的差异。结果表明:低温下硫酸钠溶液能明显增加煤岩体的孔隙率、渗透率。试验结果将对增加煤岩体孔隙率、渗透率和防止煤与瓦斯突出提供一定的参考。

Refer to the researchreservoir reconstruction and thehave found that sodium sulfateof the successful application of liquid nitrogen as a fracturing fluid indamage of rock at low temperature, and combining that some research solution can significantly aggravate the damage to rock during thefreeze-thaw cycles. Based on the nuclear magnetic resonance technology, the difference of the damageto coal samples saturated by different concentrations of sodium sulfate solution under freezingtemperature was studied. The results show that sodium sulfate solution can significantly increase theporosity and permeability of coal samples at low temperature.The test results will provide somereference for increasing the porosity, permeability of coal and preventingthe coal and gas outburst.