基于不同应力的水力裂缝形态试验研究  

Experimental Study on Fracture Morphology Based on Different Stress

作　　者：张帆[1] 马耕[1,2] 刘晓 陶云奇[1,2] 冯丹[3] ZHANG Fan;MA Geng;LIU Xiao;TAO Yunqi;FENG Dan(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Research Iustitute of Henan Energy Resource and Chemical Industry Group Co.,Ltd.,Zhengzhou 450046,China;State Key Laboratory for Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454003 [2]河南能源化工集团研究院有限公司,河南郑州450046 [3]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《煤矿安全》2019年第1期1-3,8,共4页Safety in Coal Mines

基　　金：2016年国家科技部创新方法工作专项资助项目(2016IM010400);河南省创新型科技人才队伍建设工程资助项目(164100510024);2015年河南省科技攻关资助项目(152102310095)

摘　　要：为了研究压裂后的水力裂缝形态,以相似材料成型的试件为压裂对象,利用水力压裂装置,开展了不同应力条件下的水力压裂试验。研究结果表明:二维应力条件下,水力压裂形成单一裂缝的概率大于复杂裂缝的概率;裂缝形态的复杂性与试验应力有关,当三向应力(最大水平主应力、垂直应力、最小水平主应力)的值相差较大时,容易形成单一裂缝形态;当三向应力中有2个值相近,且均与第3个应力相差较大,则容易形成复杂裂缝形态;复杂裂缝形态中的分支缝与最大水平主应力存在不同的夹角,但均沿平行于最大水平主应力的方向扩展;在同一应力条件下,不同试件压裂产生的裂缝形态也不尽相同,与试件的均质性、压裂液的流动路径、破裂面的特征有关。To study the fracture morphology, hydraulic fracturing experiments were conducted by means of hydraulic fracturing device and specimen made of similar materials under condition of different stress. The results show that the probability of forming single fracture is greater than that of forming complex fracture morphology under two-dimensional stress conditions. The complexity of fracture morphology is closely related to experimental stress. When the values of triaxial stress(maximum horizontal principal stress, vertical stress, minimum horizontal principal stress) differ greatly, it is easier to form single fracture. While two parameters of them are close and both are different greatly in values, the fracture morphology becomes complex. There is an angle between main fracture and bifurcate fracture and the angle varies in different specimens, the fractures all propagate along the direction of parallel to maximum horizontal stress. Under the same condition, fracture morphology upon different fractured specimens are different from each other, which is related to the homogeneity of the specimen, flow path of fracturing fluid and feature of fractured surface.

关 键 词：煤层气 相似材料 水力压裂 裂缝形态 瓦斯抽采 

分 类 号：TD712[矿业工程—矿井通风与安全]