Volume 9, Issue 2 (9-2015)
2015, 9(2): 2789-2816 |
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Haghi A, Asef M, Kharrat R. New Analytical Approach for Reservoir Stress Approximation Based on Acid Fracturing Data. Journal of Engineering Geology 2015; 9 (2) :2789-2816
URL: http://jeg.khu.ac.ir/article-1-2022-en.html
URL: http://jeg.khu.ac.ir/article-1-2022-en.html
1- , asef@khu.ac.ir
Abstract: (5973 Views)
In this research attempts were made to estimate the in-situ stresses acting on a hydrocarbon reservoir based on routine activities of acid injection in oil reservoir. It was found that the relation between the re-opening pressure of fracture and principal in-situ stresses can be estimated using rock mechanics equations for the circular underground cavities. An appropriate relation between the maximum and minimum horizontal principal in-situ stresses and reservoir parameters such as permeability, reservoir pressure, Young’s modulus, acid viscosity, injection flow rate and etc., was developed by using the well-known Darcy equations for fluid flow in porous media. Accordingly, knowing the flow rate of acid injection during well operations and some other reservoir parameters, in-situ stresses may be estimated. The method was then successfully applied to a large carbonate reservoir as a case study in south-west of Iran. Maximum and minimum effective horizontal stresses were calculated by employing the presented method.
Keywords: rock mechanic, acid fracturing, re-opening pressure, in-situ stresses, hydraulic fracturing
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