Petroleum Science

, Volume 8, Issue 1, pp 87–92 | Cite as

An experimental study of fracture initiation mechanisms during hydraulic fracturing

Article

Abstract

The mechanism of fracture initiation is the basic issue for hydraulic fracture technology. Because of the huge differences in fracture initiation mechanisms for different reservoirs, some successful fracturing techniques applied to porosity reservoirs are ineffectual for fractured reservoirs. Laboratory tests using a process simulation device were performed to confirm the characteristics of fracture initiation and propagation in different reservoirs. The influences of crustal stress field, confining pressure, and natural fractures on the fracture initiation and propagation are discussed. Experimental results demonstrate that stress concentration around the hole would significantly increase the fracture pressure of the rock. At the same time, natural fractures in the borehole wall would eliminate the stress concentration, which leads to a decrease in the fracture initiation pressure.

Key words

Hydraulic fracturing porosity reservoir fractured reservoir fracture initiation fracture propagation simulation experiment 

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Copyright information

© China University of Petroleum (Beijing) and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Key Laboratory of Enhanced Oil & Gas Recovery, Ministry of EducationNortheast Petroleum UniversityDaqing, HeilongjiangChina

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