A REVIEW OF RESERVOIR GEOMECHANICS IN NIGER DELTA

ABSTRACT

Wellbore failure reportedly account for more than 10% of drilling non productive time in the niger delta and accounting for rock deformation due to pore pressure and temperature changes resulting from production and fluid injection has become a major challenge without the help of geomechanic.Rocks have both elastic and inelastic mechanical characteristics. To review the elastic properties for this study, we will look at the elastic modulus (E), the Poisson's ratio (v), the rigidity/shear modulus (G), the bulk modulus (Kb), the bulk compressibility (Cb), among others. This review work uses the most recent works done in the Niger Delta like; Geomechanical Evaluation of an onshore oil fifield in the Niger Delta, Nigeria by fidelis abija and akaha c. tse(2020), Integrated 3D geomechanical characterization of a reservoir: case study of "Fuja" feld, ofshore Niger Delta, Southern Nigeria by C. C. Agoha· A. I. Opara· O. C. Okeke· C. N. Okereke· C. N. Onwubuariri· F. B. Akiang· L. J. Osaki·I. A. Omenikolo(2021) and Geomechanical Properties Estimation for Marginal Oil Field Development at Onshore Niger Delta, Nigeria by UGWU, UP; OKENGWU, KO(2022) to acces geomechanis risk due to early depletion, rock deformation due to pore pressure and tempereature change and investigate possibility of formation collapse. From this review work, we discover that Well bore stability assessment revealed that the overburden pressure, pore pressure, fracture pressure, hydrostatic pressure, 101 maximum horizontal stress and minimum horizontal stress are within a very good range and the agbada formation is the major oil and natural gas bearing facies in the basin.