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Investigating the Effectiveness of Wells and Their Anti-Collision Analysis in a Percolation Reservoir Model
, M.Sc. Thesis Sharif University of Technology ; Masihi, Mohsen (Supervisor) ; Jamshidi, Saeed (Co-Supervisor)
Abstract
In drilling the percolation structure reservoirs (such as offshore Channelized reservoirs), one of the most important factors in the effectiveness of wells is drilling permeable areas (Channels), while Channel constraints make it possible for two wells to collide. On the other hand, if the desired reservoir is an offshore reservoir, these restrictions have been increased because usually several wells are drilled near together from one platform. Therefore, proper well collision analysis method is also important in these situations. In this project, anti-collision analysis is performed using the MWD device error model between two or more wells in a static reservoir model with channel...
A novel model for wellbore stability analysis during reservoir depletion
, Article Journal of Natural Gas Science and Engineering ; 2016 , Pages 935-943 ; 18755100 (ISSN) ; Volume 35, Issue Part A ; Hassani, A. H ; Al Ajmi, A. M ; Heydari, H ; Sharif University of Technology
Elsevier B.V
Abstract
It is not common to build a geomechanical model for depleted reservoirs as logging and coring are costly and time consuming in such reservoirs. On the other hand, in regular analysis of wellbore stability, the effect of time is completely ignored. As a result, with time there will be some errors in the evaluation of wellbore stability in depleted reservoirs. In order to determine the optimum wellbore trajectory during the reservoir life, it is necessary to have a model which can estimate the rock properties based on the first full logging suite and also consider the depletion effect. In this study, a novel model is proposed which combines a mechanical earth model, borehole circumferential...
Drilling optimization based on a geomechanical analysis using probabilistic risk assessment, a case study from offshore Iran
, Article Rock Engineering and Rock Mechanics: Structures in and on Rock Masses - Proceedings of EUROCK 2014, ISRM European Regional Symposium ; 2014 , pp. 1415-1422 ; ISBN: 9781138001497 ; Jalalifar, H ; Sharif University of Technology
Abstract
In offshore Iran, wellbore instability is quite common and the main cause for most of problems during drilling operations. In this study, the existing relevant logs, drilling and other data from offset well were analyzed and integrated to construct a precise Mechanical Earth Model (MEM) describing pore pressure, stress magnitudes and orientation, and formation mechanical properties of the South Pars Gas field. Then, the constructed MEM was refined and calibrated using the existing caliper, image logs, rock mechanical core test and drilling data and through history matching to constrain and reduce the uncertainties associated with limitations and availability of the existing data. Using the...