Mechanism of Hydrofracture Propagation Control by Non-uniform Pore Pressure Field

doi:10.12068/j.issn.1005-3026.2016.07.025

Journal of Northeastern University Natural Science ›› 2016, Vol. 37 ›› Issue (7): 1028-1033.DOI: 10.12068/j.issn.1005-3026.2016.07.025

• Resources & Civil Engineering • Previous Articles Next Articles

Mechanism of Hydrofracture Propagation Control by Non-uniform Pore Pressure Field

LU Yi-yu^1,2， JIA Yun-zhong^1,3， TANG Ji-ren^1,2， SONG Chen-peng^1,2

1. State Key Laboratory of Coal Mine Disaster Dynamics and Control， Chongqing University， Chongqing 400030， China; 2. National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam， Chongqing University， Chongqing 400030， China; 3. Department of Energy and Mineral Engineering， EMS Energy Institute and G3 Center， The Pennsylvania State University， University Park， PA 16802， USA.

Received:2015-06-05 Revised:2015-06-05 Online:2016-07-15 Published:2016-07-13
Contact: JIA Yun-zhong
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Abstract

Abstract: To reveal the effect of non-uniform pressure on hydraulic fractures propagation， the porous elasticity mechanics， fracture mechanics， seepage mechanics and thermal elasticity mechanics were used to build a hydrofracture crack tip stress intensity factor calculation model considering the pore pressure. Then， through laboratory experiments and numerical simulation， the guiding mechanism of pore pressure on hydrofracture was verified. The research results showed that pore pressure can increase the crack tip stress intensity factor of hydrofracture， which causes the fractures extend to the high pore pressure region; at the same time， stress intensity factor of hydrofracture will be enlarged with the increase of pore pressure. A larger pore pressure will lead to larger deflection amplitude of fractures.

Key words: non-uniform pore pressure field, hydrofracture, stress intensity factor, fracture propagation control, RFPA^2D-Flow

CLC Number:

TD712

LU Yi-yu， JIA Yun-zhong， TANG Ji-ren， SONG Chen-peng. Mechanism of Hydrofracture Propagation Control by Non-uniform Pore Pressure Field[J]. Journal of Northeastern University Natural Science, 2016, 37(7): 1028-1033.

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Mechanism of Hydrofracture Propagation Control by Non-uniform Pore Pressure Field

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