非均匀孔隙压力场导向水压裂纹扩展机制

为揭示非均匀孔隙压力场对水压裂纹扩展的影响,采用多孔弹性力学、断裂力学、渗流力学和热弹性力学理论,建立了考虑孔隙压力的水压裂纹尖端应力强度因子计算模型,并采用室内实验和RFPA2DFlow数值模拟软件进一步分析了非均匀孔隙压力场对水压裂缝扩展的导向机制.研究结果表明：孔隙压力场的存在可以增大水压裂纹尖端的应力强度因子,从而诱导水压裂缝沿高孔隙压力方向扩展;同时,水压裂纹尖端的应力强度因子会随着孔隙压力增大而增大,孔隙压力越大,裂纹的偏转幅度也会越大....

Full description

Saved in:
Bibliographic Details
Published in东北大学学报（自然科学版） Vol. 37; no. 7; pp. 1028 - 1033
Main Author 卢义玉 贾云中 汤积仁 宋晨鹏
Format Journal Article
LanguageChinese
Published 重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室，重庆 400030%重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400030 2016
重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400030
Department of Energy and Mineral Engineering，EMS Energy Institute and G3 Center，The Pennsylvania State University，University Park，PA 16802，USA
Subjects
RFPA2D-Flow
应力强度因子
水压裂纹
裂纹导向
非均匀孔隙压力场
水压裂纹
non-uniform pore pressure field
hydrofracture
RFPA2D-Flow
stress intensity factor
fracture propagation control
非均匀孔隙压力场
应力强度因子
裂纹导向
Online AccessGet full text
ISSN1005-3026
DOI10.3969/j.issn.1005-3026.2016.07.025

Cover

More Information
Summary:为揭示非均匀孔隙压力场对水压裂纹扩展的影响,采用多孔弹性力学、断裂力学、渗流力学和热弹性力学理论,建立了考虑孔隙压力的水压裂纹尖端应力强度因子计算模型,并采用室内实验和RFPA2DFlow数值模拟软件进一步分析了非均匀孔隙压力场对水压裂缝扩展的导向机制.研究结果表明：孔隙压力场的存在可以增大水压裂纹尖端的应力强度因子,从而诱导水压裂缝沿高孔隙压力方向扩展;同时,水压裂纹尖端的应力强度因子会随着孔隙压力增大而增大,孔隙压力越大,裂纹的偏转幅度也会越大.
Bibliography:21-1344/T
non-uniform pore pressure field; hydrofracture; stress intensity factor; fracturepropagation control; RFPA2D -Flow
Toreveal the effect of non-uniform pressure on hydraulic fractures propagation,theporous elasticity mechanics, fracture mechanics, seepage mechanics and thermal elasticitymechanics were used to build a hydrofracture crack tip stress intensity factor calculation modelconsidering the pore pressure. Then ,through laboratory experiments and numerical simulation,the guiding mechanism of pore pressure on hydrofracture wa s verified. The research resultsshowed that pore pressure can increase the crack tip stress intensity factor of hydrofracture, whichcauses the fractures extend to the high pore pressure region; at the same time, stress intensityfactor of hydrofracture will be enlarged with the increase of pore pressure. A larger pore pressurewill lead to larger deflection amplitude of fractures.
LU Yi-yu,JIA Yun-zhong, TANG Ji-ren,SONG Chen-peng（1. State Key Laboratory of Coal Mine Disaster Dyna
ISSN:1005-3026
DOI:10.3969/j.issn.1005-3026.2016.07.025