Network fracturing technique in shale reservoirs based on weak discontinuity and fracture interaction

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  • 1.China University of Petroleum(East China),Qingdao 266580,China;
    2.Langfang Branch of Research Institute of Petroleum Exploration & Development,PetroChina,Langfang 065007,China

Received date: 2015-09-05

  Revised date: 2015-11-01

  Online published: 2019-09-10

Abstract

Network fracturing technique is important for the development of shale gas.To investigate the influence of weak discontinuities and fracture interaction on network fracturing result,the formation of complex fractures under weak plan and fracture interaction was analyzed theoretically on the basis of full three-dimensional physical simulation experiments.With combination of numerical simulation,several methods contributing to complex fractures were discussed.The results show that the hydraulic fracture may stop extension,swerve or initiate new fracture when it intersects with the plan.The weak discontinuity can become effective channel for gas to flow after it was opened or was shear dislocated.The hydraulic fracture occurring afterwards was influenced by the fracture generating beforehand due to the fracture interaction and then its approaching angle with weak plan changed.Branch crack occurred between two principle fractures and that was helpful to the formation of complicated fracture network.Proper reduction of fracture interval is in favor of enhancing the interaction at some extent.Some methods that had been tested in the field have obtained satisfactory monitoring results.The change of fracturing process and the combination of different techniques can be effective ways to enhance the fractures complexity.

Cite this article

Shang Xiao-sen, Ding Yun-hong, Yang Li-feng, Lu Yong-jun, Yan Xue-mei, Wang Yong-hui . Network fracturing technique in shale reservoirs based on weak discontinuity and fracture interaction[J]. Natural Gas Geoscience, 2016 , 27(10) : 1883 -1891 . DOI: 10.11764/j.issn.1672-1926.2016.10.1883

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