关键词: 沁水盆地煤层, 压裂液, 煤层伤害, 防煤粉, 助排剂

Abstract: Coal seams have the characteristics of low Young's modulus，large Poisson's ratio，strong adsorption，and strong anisotropy. Ordinary fracturing fluids are likely to cause damage to the coal seams，and the coal seams are prone to produce a large amount of pulverized coal due to high pressure during the fracturing process. Based on the characteristics of Qinyuan block 2# coalbed，the systems of active water fracturing fluid and anti-pulverizing coal fracturing fluid are obtained through indoor simulation experiments. The results show that the damage rate of active water fracturing fluid to the coal matrix is 11. 92%. The anti-pulverizing coal fracturing fluid can effectively carry out the coal powder，and the damage rate to the coal rock matrix is 22. 65%. Both fracturing fluid systems can satisfy the requirements.

Key words: coal seam in Qinshui Basin, fracturing fluid, coalbed damage, anti-pulverizing coal powder, drainage aid