摘要
针对煤矿水力压裂封孔工艺复杂、封孔困难的问题,开展对钻孔胶囊封孔器耐压特性的理论研究,提出胶囊封孔器有效封孔的2个条件:钻孔壁对封孔器的摩擦力大于钻孔内高压水对封孔器的推力;封孔器作用在钻孔壁上的有效压力大于水力压裂的最大注水压力。理论分析结果表明:当胶囊长度大于临界长度时,胶囊内水的压力越大,胶囊段的长度越长,钻孔直径越小,封孔器所能承受的最大注水压力越大;反之,胶囊封孔最大耐压能力主要取决于胶囊内注水的压力。根据该结论确定了余吾煤业S2107高抽巷水力压裂封孔器封孔的参数,封孔效果良好,结论为封孔器的设计及现场应用提供指导。
Aiming at complex processes and difficuhies of hole sealing of hydraulic fracturing in coal mines, theoretical study for the pressure bearing characteristics of borehole capsule packer was carried out. Two conditions of effective hole sealing with capsule packer were proposed, the first one was that the friction force of the borehole surface to the packer should be bigger than the thrust force of the high pressure water in borehole to the packer, the other one was that the effective pressure that the packer to the borehole surface should be bigger than the maximum injection water pressure of hydraulic fracturing. Theoretical analysis indicated that if the length of the packer was longer than the critical length, the higher the pressure inside the packer was, the longer the packer segment was, the smaller the horehole diameter was, and the greater the water injection pressure bearing would he. Otherwise, the maximum pressure hearing ability of hole sealing was dominated by the water pressure inside the packer. The hydraulic fracturing hole sealing parameters of Yuwu Coal Mine S2107 high level suction roadway was determined based on the conclusion, the hole sealing effect was good, which provided guidance for the design of borehole packer and its application.
出处
《煤矿安全》
CAS
北大核心
2014年第7期114-117,共4页
Safety in Coal Mines
基金
国家重点基础研究发展计划(973计划)资助项目(2011CB201205)
国家自然科学基金资助项目(51074161
51274195)
江苏省自然科学基金资助项目(BK2012571)
关键词
水力压裂
封孔器
高压封孔
影响因素
封孔条件
消突技术
hydraulic fracturing
hole packer
hole sealing under high pressure
effect factors
hole sealing condition
outburst elimination technology
作者简介
彭深（1988－），男，河南永城人，中国矿业大学在读硕士研究生，从事矿井瓦斯防治方面的研究。
