首页|Evaluation of the combined influence of geological layer property and in-situ stresses on fracture height growth for layered formations

Evaluation of the combined influence of geological layer property and in-situ stresses on fracture height growth for layered formations

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Fracture geometry is important when stimulating low-permeability reservoirs for natural gas or oil production.The geological layer(GL)properties and contrasts in in-situ stress are the two most important parameters for determination of the vertical fracture growth extent and containment in layered rocks.However,the method for assessing the cumulative impact on growth in height remains ambiguous.In this research,a 3D model based on the cohesive zone method is used to simulate the evolution of hydraulic fracture(HF)height in layered reservoirs.The model incorporates fluid flow and elastic deformation,considering the friction between the contacting fracture surfaces and the interaction between fracture components.First,an analytical solution that was readily available was used to validate the model.Afterwards,a quantitative analysis was performed on the combined impacts of the layer interface strength,coefficient of interlayer stress difference,and coefficient of vertical stress difference.The results indicate that the observed fracture height geometries can be categorized into three distinct regions within the parametric space:blunted fracture,crossed fracture,and T-shaped fracture.Furthermore,the results explained the formation mechanism of the low fracture height in the deep shale reservoir of the Sichuan Basin,China,as well as the distinction between fracture network patterns in mid-depth and deep shale reservoirs.

Deep shaleHydraulic fracturingHF propagationFracture interactionCohesive zone method

Peng Tan、Zhao-Wei Chen、Liu-Ke Huang、Qing Zhao、Sha-Rui Shao

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CNPC Engineering Technology R&D Company Limited,Beijing,102206,China

National Engineering Research Center for Oil & Gas Drilling and Completion Technology,Beijing,102206,China

School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu,610500,Sichuan,China

Shale Gas Research Institute,Southwest Oil & Gas Field Company,Chengdu,610051,Sichuan,China

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2024

10.1016/j.petsci.2024.07.014

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(5)