DEM simulation of confining pressure effects on crack opening displacement in hydraulic fracturing

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• 作者：Abolfazl Abdollahipour ; ^{ab.abdollahipour@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Mohammad Fatehi Marji ; Alireza Yarahmadi Bafghi ; Javad Gholamnejad
• 关键词：Hydraulic fracture ; COD ; Numerical analysis ; Confining pressure ; Regression
• 刊名：International Journal of Mining Science and Technology
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：26
• 期：4
• 页码：557-561
• 全文大小：1585 K

文摘

Hydraulic fracture is one of the key methods in well stimulation to increase production of oil and gas. Crack Opening Displacement (COD) is of great importance in this method since it is in direct relation with permeability and production rate. In this paper COD is measured by a distinct element model which has been validated by an exact solution. A comprehensive study has been performed on confining pressure effect on COD which is neglected in the analytical solution. Numerical results showed that confining pressure considerably affects COD. A multi-parameter regression (considering effect of confining pressure, rock mass properties and fluid pressure) was performed on numerical results which resulted in an equation. The proposed equation considers the effect of confining pressure and its results are in good agreement with numerical results.