Journal
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Volume 25, Issue -, Pages 180-188Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2015.05.008
Keywords
Hydraulic fracturing; Fracture geometry; Fracture intersection; in-situ stress; Approaching angle
Categories
Funding
- National Natural Science Foundation of China [51374178]
- PetroChina Innovation Foundation [2014D-5006-0213]
- search Foundation of Sichuan Province [2014HH0004]
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The fracture diagnostic technology reveals that complex fracture network plays a key role in shale gas production. In this paper, a new model based on the cohesive zone method coupling stress-seepage-damage filed is developed to simulate the interaction between hydraulic fracture and natural fracture without introducing the crossing criterion. The initiation and propagation of hydraulic fracture and natural fracture are simulated to study the intersection process including hydraulic fracture encounters natural fracture and extends separately. The effects of in-situ stress and approaching angle on the intersection between hydraulic fracture and natural fracture are discussed. And the effect of natural fracture cementing strength on fracture geometry is simulated. The smaller the approaching angel and differential stress, the easier for natural fracture initiating and propagating. These findings could provide theoretical guidance for predicting the generation of complex fracture network. (C) 2015 Elsevier B.V. All rights reserved.
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