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| 1 | Investigation of rock salt layer creep and its effects on casing collapse显示文摘Casing collapse is one of the costly incidents in the oil industry. In the oil fields of southwest Iran, most casing collapses have occurred in Gachsaran formation, and the halite rock salt layer in this formation may be the main cause for these incidents because of its peculiar creep behavior. In this research, triaxial creep experiments have been conducted on Gachsaran salt samples under various temperatures and differential stresses. The main purpose was to determine the creep characteristics of Gachsaran rock salt,and to examine the role of creep in several casing collapses that occurred in this formation. Results indicated that the halite rock salt of Gachsaran formation basically obeys the power law;however, its creep parameters are quite different from other halite rocks elsewhere. The time-dependent creep of Gachsaran rock salt exhibits strong sensitivity to temperature change;however, its sensitivity to variation of differential stress is rather low. The numerical simulation of the rock salt creep in a real oil well demonstrated the importance of creep and reservoir conditions on the safety factor of the tubing related to casing collapse. | S.Reza Taheri Ali Pak Saeed Shad Behzad Mehrgini Meisam Razifar | 2020 | International Journal of Mining Science and Technology2020，30，3： | 6 |
| 2 | IntegraIed Coastal Management Plan in Free Trade Zones,a Case Study 显示文摘 | Ali Pak & Farhad Majd | 2010 | Occan and Coastal Management2010，，2： | 1 |
| 3 | Numerical study of the coupled hydro-mechanical effects in dynamic compaction of saturated granular soils显示文摘 | Ali Ghassemi Ali Pak Hadi Shahir | 2009 | Computers and Geotechnics2009，，1： | 1 |
| 4 | Triggerable liposomal fusion by enzyme cleavage of a novel peptide-lipid conjugate 显示文摘 | Pak CC Ali S Janoff AS | 1998 | Biochim Biophys Acta1998，1372，1： | 1 |
| 5 | Integrated coastal management plan in free trade zones, a case study 显示文摘 | Ali Pak Farhad Majd | 2011 | Ocean & Coastal Manage-ment2011，54，2： | 1 |
| 6 | Geotechnical characteristics of copper mine tailings:A case study显示文摘 | Shamsai Abolfazl Ali Pak Bateni S.Mohyeddin Ayatollahi S.Amir Hossein | | 0，，05： | 1 |
| 7 | Integrated Coastal Management Plan in Free Trade Zones, A Case Study 显示文摘 | Pak Ali Majd F | 2011 | Ocean & Coastal Mnangement2011，54，02： | 1 |
| 8 | Estimating liquefaction-induced settlement of shallow foundations by numerical approach 显示文摘 | Hadi Shahir Ali Pak | 2010 | Computers and Geotechnics2010，37，： | 1 |
| 9 | Integrated coastal management plan in free trade zones, a case study显示文摘 | Ali Pak Farhad Majd | 2011 | Ocean& Coastal Management2011，，54： | 1 |
| 10 | Numerical simulation of sanding using a coupled hydro-mechanical sand erosion model显示文摘Mechanical failure of materials adjacent to the production cavity and material disaggregation caused by fluid drag are considered as the most important parameters that affect sand production.In light of such factors,the coupling of two mechanisms-mechanical instability and hydrodynamic erosion-is indispensable in order to model this phenomenon successfully.This paper examines the applicability of a coupled hydro-mechanical erosion criterion for simulating sand production using the finite element method.The porous medium was considered fully saturated.The onset of sanding and production of sand were predicted by coupling mechanical failure and subsequent erosion of the grain particles utilizing a sanding model.To consider the erosion process,the Papamichos and Stavropoulou(1998)’s sand erosion criterion was incorporated into the finite element code.Arbitrary Lagrangian-Eulerian(ALE)adaptive mesh approach was used to account for large amounts of erosive material loss.Besides,in order to address the problem of severe mesh distortion,the“mesh mapping technique”was employed.Sand production in a horizontal wellbore and in a field case was simulated to demonstrate capabilities of the proposed model.In addition,principal parameters affecting sand production,including in situ stresses,cohesion,perforation orientation,and drawdown were examined.The results indicated the efficiency of the model used in evaluation of sanding in the field.Parametric studies indicated that in situ stresses and formation cohesion could be considered as dominant factors affecting the amount of sand production. | Majid Fetrati Ali Pak | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，4： | 0 |
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