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Mechanism of Hydraulic Fracture Propagation Considering Fractal Crack Length and Bending Effects(PDF)

《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

Issue:
2015年04期
Page:
454-
Research Field:
Publishing date:

Info

Title:
Mechanism of Hydraulic Fracture Propagation Considering Fractal Crack Length and Bending Effects
Author(s):
LI Xiaogang1 YI Liangping1 YANG Zhaozhong1 ZHOU Nayun2
(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan610500, China;2. Research Institute of Gas Production Engineering ,Southwest Oil & Gas Field Company, PetroChina, Guanghan, Sichuan618300, China)
Keywords:
hydraulic fracturing fractal crack propagation bending effect fracture width equation fracture toughness
PACS:
TE357.11
DOI:
10.7657/XJPG20150413
Abstract:
To well understand the impact of fractal cracks propagation on hydraulic fracturing, the fracture toughness expressions considering the fractal crack length and bending effects were re?derived based on traditional linear fracture expansion model, establishing a new equation for hydraulic fracture width and the model for crack internal net pressure as required by hydraulic fracture propagation. Theoretical analysis indicates that the fractal dimension increases with crack propagation bending angle. Compared with the linear fracture expansion model, the crack internal net pressure is increasing after considering the fractal crack length and bending effects, and the fracture width given by this linear model is decreasing in the first80%part of a fracture, that is, the fracture width near the fracture end could be increasing, which means that the fracture width computed by the linear fracture expansion model will be bigger than that in actual condition. Subsequently, the proppants available for fracture propagation in the linear model may possibly form bridge plugging in practice

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Last Update: 2015-09-21