Evaluation of Stress Anisotropy of the Formation by Utilizing Dipole Shear Sonic Imager (DSI*), Formation Micro Imager (FMI*) and Density logs. A Case Study on Kanawara Field, South Cambay Basin, India.

Abstract

Abstract Knowledge on Stress anisotropy of the formation is vital to understand the stress direction and magnitude. A stress direction allows well bore stability analysis for safe and cost effective drilling in a challenging environment. Well bore stability analysis showed a large tectonic imbalance between minimum and maximum horizontal stress. As a result, wells drilled in the direction of maximum horizontal stress will have a significant increase in wellbore stability problems compared to those drilled in the direction of minimum horizontal stress. Perforations to be oriented consistent with stress direction to optimize the production and minimize sanding problems. Identification of anisotropy due to fractures leads to enhanced production and maximize the oil recovery from the hydraulic fracturing job. Well bore stability analysis (WBS) of Kanawara field can be performed by define the rock properties such as Young's modulus, Shear modulus, Poisson's ratio and elastic properties like unconfined compressive strength (UCS) and friction angle of the formation. WBS is a numerical representation of rock mechanical properties, in-situ stresses and pore pressure for a specific stratigraphic section in a field. Compressional slowness (DTCO) and shear slowness (DTSM) along with density (RHOB) log are basic wireline measurements used in determining formation mechanical properties in the vicinity of well #1. The geomechanical study was conducted by utilizing data from all domains, which included wireline data mainly Dipole sonic (DSI*), FMI* and Density logs. Drilling and completion reports, mud logs, MDT tests, minifracture tests, injectivity tests and LOT values are used for calibration purposes.