低透气性煤层点式酸化压裂增透技术研究与应用  

Research and Application of Point-type Acidification Fracturing Technology for Enhancing Permeability in Low Permeability Coal Seams

作　　者：王安红 WANG Anhong(Shanxi Sanyuan Coal Industry Co.,Ltd.,Changzhi 046000,Shanxi,China)

机构地区：[1]山西三元煤业股份有限公司,山西长治046000

出　　处：《能源与节能》2024年第7期21-23,30,共4页Energy and Energy Conservation

摘　　要：为解决富含矿物质煤层透气性问题,基于点式压裂和酸液增透煤体机制,提出了点式酸化压裂增透技术,且通过扫描电镜试验确定了适合三元煤矿的酸液配比。现场试验结果表明,点式酸化压裂钻孔组的平均瓦斯抽采流量和浓度是普通钻孔组的3.65倍和1.72倍,是点式水力压裂钻孔组的1.32倍和1.06倍,点式酸化压裂增透效果明显优于点式水力压裂,且其增透煤体的起裂压力和同等条件下的注液量均低于点式水力压裂。点式酸化压裂实现了煤体定点、低流量、大范围、快速增透,其对物理增透与化学增透方式的融合大大提高了煤体孔隙-裂隙结构的发育程度和其整体连通性,有助于煤体中瓦斯的运移及高效抽采。To solve the problem of permeability in mineral rich coal seams,a point-type acidification fracturing technology for enhancing permeability was proposed based on the mechanism of point-type fracturing and acid enhanced permeability of coal bodies,and the acid ratio suitable for Sanyuan Coal Mine was determined through scanning electron microscopy experiments.The field test results show that the average gas extraction flow and concentration of point-type acidizing fracturing drilling group is 3.65 times and 1.72 times of that of common drilling group,1.32 times and 1.06 times of that of point-type hydraulic fracturing drilling group,and the anti-permeability effect of point acidizing fracturing is obviously better than that of point-type hydraulic fracturing.In addition,the crack initiation pressure and liquid injection amount of the anti-reflection coal body under the same conditions are lower than that of the point-type hydraulic fracturing.The point-type acidizing fracturing achieves the fixed-point,low-flow,large-range and rapid anti-reflection of the coal body.The integration of the physical anti-reflection and chemical anti-reflection modes greatly improves the development degree of the pore and fracture structure of the coal body and its overall connectivity,which is conducive to the migration and efficient extraction of gas in the coal body.

关 键 词：点式酸化压裂 扫描电镜试验 酸液配比 横向裂纹 微观孔隙结构 

分 类 号：TD713.3[矿业工程—矿井通风与安全]