摘要
为提高煤层透气性和瓦斯抽采效果,研究井下点式水力压裂增透工艺,用低流量水流达到增透效果,从而减小压裂设备体积、质量,以适应煤矿井下受限的空间条件。利用RFPA2D-flow软件,建立符合现场环境条件的三孔数值模型,对点式水力压裂过程进行了数值试验,揭示煤体破坏、裂纹的萌生、发展直至贯通的整个过程。研究了剪应力、水压力、水流量等参数的分布与演化,并通过现场实验进行验证。数值试验与现场试验均表明井下点式水力压裂技术能提高瓦斯抽采量,可使压裂设备实现小型化。
For improving the coal seam permeability and gas drainage effects,researching underground point hydraulic fracturing increase permeability process,increased permeability effect with low-flow water which can reduce the fracturing equipment size,weight,to meet the conditions for space-constrained coal mine.Using RFPA2D-flow software,established on-site environmental conditions the three-hole numerical model,and carried numerical test of point hydraulic fracturing process,suggested the coal damage,crack initiation,development through the whole process.Researched the shear stress,water pressure,water flow and other parameters of the distribution and evolution,which were tested and verified through field experiments.Numerical experiments and field tests show that the underground point hydraulic fracturing can increase the amount of gas drainage,fracturing equipment can achieve miniaturization.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第8期1317-1321,共5页
Journal of China Coal Society
基金
国家"十二五"大型油气田及煤层气开发科技重大专项(2011ZX05041-003)
关键词
点式压裂
水力压裂
增透
瓦斯抽放
point fracturing
hydraulic fracturing
increased permeability
gas drainage
