NUMERICAL 3D GEOMECHANICAL MODEL (THE CASE OF PJSC "LUKOIL" OIL FIELD)
UDC: 622.24.001.57
DOI: 10.33285/2413-5011-2021-4(352)-43-48
Authors:
PREDEIN ANDREY ALEKSANDROVICH1,
KLYKOV PAVEL IGOREVICH1,
GARSHINA OLGA VLADIMIROVNA1,
OKROMELIDZE GENNADIY VLADIMIROVICH1,
KUZNETSOV SERGEY ALEKSANDROVICH1,
KILINA MARIA FEDOROVNA1,
KUCHEVASOV SERGEY IVANOVICH1
1 LUKOIL-Engineering Limited PermNIPIneft Branch Office in Perm, Perm, Russian Federation
Keywords: geomechanics, stress calculation, finite element method, wellbore stability, pore pressure, rock caving pressure, absorption pressure, hydraulic fracturing pressure, horizontal drilling
Annotation:
The results of geomechanical simulation for solving problems of provision of accident-free well drilling are considered. A numerical 3D geomechanical model for the field under study with the subsequent stability calculation of producing wells is developed. A method of 1D geomechanical simulation on reference wells was studied, including determination of dynamic and static elastic strength characteristics of rocks, calculation of pore pressure and vertical and horizontal stress. Well stability calculations based on the 1D geomechanical simulation results were obtained and analyzed. Next, the results of 3D geomechanical simulation were analyzed: determination of the limits and development of the model’s structural framework, geometry testing, filling the grid with mechanical properties, as well as calculation of the total stress tensor by the finite element method (FEM). The results of 1D and 3D modeling were compared. Herewith, a numerical 3D geomechanical model for the field under study was developed. The next step was to calculate wellbore stability for projected wells. Additionally, cubes of pressure gradients of drilling mud absorption, rock caving and hydraulic fracturing at various inclination angles and drilling directions were calculated. Recommendations have been developed for accident-free well construction in the field under study, including real-time support and update of the geomechanical model during drilling. The results obtained and the operations method can be used in the design and construction of wells in other fields subject to regional specifics.
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