The title of the talk was “Geomechanical Modelling – Data to Solutions (Nearby Wellbore & Field-Scale)”. It was given by Somesh Bahuguna, Drilling and Geomechanics Team Leader from Schlumberger to an audience of Geoscience personnel of varied seniority and expertise. The talk was attended by Sri Debashish Basu Asset Manager, Ahmedabad Asset and Sri O.N.Gyani Head of Institute, IRS.
The presentation started by a discussion on what is geomechanics and what kind of challenges does it addresses to within the Oil and Gas Industry. It was followed a small recapitulation of basics rock mechanics and intrinsic properties like Poisson’s ratio, Young’s Modulus and extrinsic properties like Horizontal stresses, Overburden stress etc.
In order to provide geomechanics based solution, a Mechanical Earth Model (MEM) is a basic requirement. Hence, presentation described what a 1D is and 3D MEM and what are its various components. What log measurements are required to generate each MEM component was also discussed.
Further part of the presentation was divided into two parts 1D Solution and 3D solutions and relevant case studies. Under both the headings solutions like Drilling solutions using Pore pressure and Wellbore stability modelling, Sanding Analysis, Critical Stressed Fracture analysis for Basement reservoirs, Hydraulic Fracture optimization in tight reservoirs. Of these topics, Hydraulic Fracture optimization was discussed in detail. Importance of Isotropic Stress Model and TIV Anisotropic stress model with regards to laminated reservoirs was discussed.
It was shown how the latter allows for generation of more realistic simulation using stress models which allows proper fracturing job and ideal placement of proppants.
The 3D phase of the presentation started with basic requirements of 3D MEM construction. Concept of coupling of stress model and dynamic pressure model was also discussed. Examples of how coupling allows for estimation of reservoir compaction and surface subsidence were presented along with some case studies. In this context, effect of depletion on reservoir permeability was also discussed along with some case studies. Hydraulic Fracture optimization using 3D numerical modelling was also discussed in detail. Importance of software packages which allow for generation and seamless integration of Static modelling, Stress modelling, Dynamicmodelling and Hydraulic fracture stimulation using numerical algorithms was also discussed.
The talk ended with a Q&A session where audience took active part in the discussion and brought forward their challenges and their experience in dealing with it.