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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 50474 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Khoei, Amir Reza; Erfan Nia, Ali; Shad, Saeed
- Abstract:
- The wellbore instability is one of the challenging problems in the oil industry, which entails huge costs for the industry every year. This phenomenon not only causes numerous problems in drilling and completion of wells, but also reduces production and loss of wells. In recent years, this problem has become much more serious in the Kupal oilfield. As a result, a large number of wells drilled in the field shortly after completion face with the problem of instability, integrity and casing collapse. According to the studies, one of the main causes of such a problem is the Gachsaran high pressure formation. Despite the complexity and importance of this issue, there is not a comprehensive study of the various layers of this formation, such as the salt layers 2 and 4. Investigating the geomechanical behavior of these layers due to the nature of the salt and the particular behavior of this rock sample against the stresses is of great importance in various industries, including the oil industry. For a comprehensive geomechanical study of salt rock, samples were selected representing the Gachsaran Formation. After preparing the cores for rock mechanics and geomechanical tests, all properties of these specimens were analyzed before and after the experiment. In this way, a complete model of the actual situation is presented. A new relationship was developed to estimate the porosity of salt layers based on laboratory results and data on petrophysical charts. After that, geomechanical tests were performed on samples on the basis of uniaxial and tri-axis compressive strength at ambient temperature as well as different temperatures of Gachsaran Formation. The results indicate that salt samples do not succumb to high stresses, and the specimens only undergo permanent deformation and become plastic. All rock salt strength properties are reduced with increasing temperature, and rock finds plastics. Relationships were also established to predict the behavior of the samples against temperature variations. Studies show that the geomechanical properties of salt rock are a function of two factors of temperature and heterogeneity, which are closely correlated and consistent with experimental results for this important matter
- Keywords:
- Temperature Profile ; Wellbore Instability ; Geomechanical Process ; Gachsaran Oil Field ; Salt Rock ; Geomechanical Properties
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