Open AccessNUMERICAL SOLUTION OF GEOMECHANICAL PROBLEMS (THE CASE OF THE BALTIC SEA SHELF FIELD)
Author(s) -
Nadezhda A. Liadova,
Pavel Klykov,
Andrei A. Predein
Publication year - 2020
Publication title -
vestnik permskogo nacionalʹnogo issledovatelʹskogo politehničeskogo universiteta. geologiâ, neftegazovoe i gornoe delo
Language(s) - English
Resource type - Journals
eISSN - 2305-1140
pISSN - 2224-9923
DOI - 10.15593/2224-9923/2020.2.3
Subject(s) - computation , geology , drilling , finite element method , geotechnical engineering , petroleum engineering , computer science , engineering , structural engineering , mechanical engineering , algorithm
Geomechanical modeling aims at solving problems associated with ensuring accident-free well drilling. The paper deals with building a numerical 3D geomechanical model for a studied field with a further production well stability computation. The region of operations is located in the Baltic Sea shelf. Apart from the field summary, the study contains results of acquisition and audit of initial data for modeling. The method is discussed for unidimensional geomechanical modeling on key wells, including determination of dynamic and static elasticity and strength of the rock varieties, computations of pore pressure, vertical and horizontal stresses. Well stability computations have been obtained and analyzed on the basis of the findings of 1D geomechanical modeling. A further analysis deals with the results of 3D geomechanical modeling, i.e. determination of boundaries and building a structural framework of the model, geometry testing, filling the grid with mechanical properties, and computation of complete stress tensor using the finite element method (FEM). Results of the 1D- and 3D-modeling have been compared. Thus, a numerical 3D geomechanical model has been built for the field under study. The following stage of works was focused on the wellbore stability computation for the planned wells. Additionally, computation was performed for drilling mud absorption pressure gradient cubes, caving pressure, and rock hydraulic fracturing pressure at different inclination angles and drilling azimuths. Recommendations were developed for accident-free construction of wells in the field under study, including upkeep and update of the geomechanical model in real time during drilling of wells. The obtained results and techniques can be used in design and construction of wells in other fields though taking into account regional specifics.