高压水力压裂和二氧化碳相变致裂联合增透技术  

Combined permeability improved technology with high pressure hydraulic fracturing and carbon dioxide phase change cracking

作　　者：秦江涛[1] 陈玉涛 黄文祥[1] 

机构地区：[1]重庆工程职业技术学院,重庆402260 [2]中煤科工集团重庆研究院有限公司,重庆400039

出　　处：《煤炭科学技术》2017年第7期80-84,共5页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51204217);重庆市科学技术研究资助项目(KJ1732437)

摘　　要：针对白皎煤矿地质构造复杂、构造应力大、煤层透气性差、抽采瓦斯效果差的问题,提出了高压水力压裂和二氧化碳相变致裂联合增透技术,分析了水力压裂和二氧化碳相变致裂联合增透技术的原理;并在238底板巷对B4煤层进行了联合增透对比试验研究。试验结果表明:试验区域煤层透气性显著提高,单孔初抽瓦斯体积分数分别是高压水力压裂试验区域和普通抽采试验区域平均瓦斯体积分数的1.70、3.48倍;瓦斯抽采纯量较水力压裂区域和普通抽采区域分别提高了1.49、3.04倍;抽采65 d以后,高压水力压裂和二氧化碳相变致裂联合增透区域汇总瓦斯体积分数仍保持在40%以上,抽采效果良好,该技术可供类似矿井借鉴。According to the problems of complicated geological tectonics,high tectonic stress,poor seam permeability and poor gas drainage effect in Baijiao Mine,a permeability improved technology combined with a high pressure hydraulic fracturing and carbon dioxide phase change cracking was provided and the principle of the hydraulic fracturing and carbon dioxide combined permeability improved technology was analyzed. A comparison experiment study was conducted on the combined permeability improvement of No. B4 Seam in No. 238 floor gateway. The experiment results showed that the permeability of the seam in the technical experiment area was remarkably improved and the initial drained gas volume fraction of a single borehole was 1.70 times and 3.48 times higher than the average volume fractions of the high pressure hydraulic fracturing area and the conventional gas drainage trial area individually. The gas drainage pure volume was improved by 1.49 and 3.04 times higher than the hydraulic fracturing area and the conventional gas drainage area individually. After 65 days of the gas drainage operation,the total gas volume fraction of the high pressure hydraulic fracturing and carbon dioxide phase change cracking combined permeability area could keep over 40%,the gas drainage effect was excellent and the technology could provide references to the similar mines.

关 键 词：高压水力压裂 二氧化碳相变致裂 低透气性煤层 瓦斯抽采 

分 类 号：TD712[矿业工程—矿井通风与安全]