提高煤储层渗透率的酸化实验

Acidification experiment for enhancing the permeability of coal reservoir

为了研究酸化对煤储层渗透率的影响,进行了室内酸化实验.采取山西沁水盆地南部晋城矿区3 号煤层中裂隙发育的煤样,分别将其制成60-80 目的干燥煤粉和直径为50 mm 的煤心,用不同的酸液体系对煤粉和煤心进行处理,测量煤粉酸化后的溶蚀率以及煤心酸化前后的渗透率和孔隙度.实验结果发现,经酸化后煤心渗透率由原来的0.5×10^–3 μm^2 左右提高到3.0×10^–3 μm^2 左右,孔隙度增加了5.5%左右.对煤心进行酸化处理能极大的提高其渗透性,为煤层气酸化现场施工提供实验支撑.

In order to study the influence of acidification on the permeability of coal reservoir,indoor acidification experiment was carried out. Coal samples with developed fractures in NO.3 coal seam of Jincheng area of Qinshui basin in Shanxi Province were adopted. The coal samples were made into dry pulverized coal of 60-80 mesh and coal cores of 50 mm in diameter, then the pulverized coal and coal cores were processed with different acids. The dissolution rate after acidification of the pulverized coal, the permeability and the porosity before and after acidi-fication of the coal cores were measured. The results indicated that after acidification the permeability of the coal cores increased from about 0.5×10–3μm2 to 3.0×10–3μm2 and the porosity increased about 5.5%. Acidification of coal core could greatly improve its permeability. The research results provide an experimental support for the ap-plication of coalbed methane acidification operation.