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Geomechanics and Engineering Volume 38, Number 2, July25 2024 , pages 107-123 DOI: https://doi.org/10.12989/gae.2024.38.2.107 |
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The effect of well inclination angle on sand production using FDM–FEM modelling; A case study: One of the oil fields in Iran |
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Nemat Nemati, Kamran Goshtasbi, Kaveh Ahangari and Reza Shirinabadi
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| Abstract | ||
| The drilling angle of the well is an important factor that can affect the sand production process and make its destructive effects more severe or weaker. This study investigated the effect of different well angles on sand production for the Asmari Formation, located in one of the oil fields southwest of Iran. For this purpose, a finite difference model was developed for three types of vertical (90), inclined (45), and horizontal (0) wells with casing and perforations in the direction of minimum and maximum horizontal stresses, then coupled with fluid flow. Here, finite element meshing was used, because the geometry of the model is so complex and the implementation of finite difference meshes is impossible or very difficult for such models. Using a combined FDM-FEM model with fluid flow, the sand production process in three different modes with different flow rates for the Asmari sandstone was investigated in this study. The results of numerical models show that the intensity of sand production is directly related to the in-situ stress state of the oil field and well drilling angle. Since the stress regime in the studied oil field is normal, the highest amount of produced sand was in inclined wells (especially wells drilled in the direction of minimum horizontal stress) and the lowest amount of sand production was related to vertical wellbore. Also, the Initiation time of sand production in inclined wells was much shorter than in other wellbores. | ||
| Key Words | ||
| numerical modeling; perforation; sand production; sanding initiation; sanding rate; well inclination angle | ||
| Address | ||
| Nemat Nemati and Kaveh Ahangari: Department of Mining Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran Kamran Goshtasbi: Department of Mining Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran Reza Shirinabadi: Department of Petroleum and Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran; Research Center for Modeling and Optimization in Science and Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran | ||