Safe mud weight window design using geomechanical model for existing and new wells Case study (Abu Gabra South west-1)

Abstract

Wellbore stability analysis and efficient hole cleaning are highly recommended, which impact drilling cost, instability-related problems are some of the most costly issues that can happen in a drilling operation. Over the years, various studies have been conducted in this area. The objectives of this study are first to build a geomechanical model for the Abu Gabra SW-1 using wireline logging data, second to utilize a geomechanical model and perform a wellbore stability analysis for the next development well. One of the most critical factors that to be considered and controlled while drilling operation is the mud weight, this parameter is commonly used to determine the stability of the well, the graphical representation of its safe mud weight window is provided. The model for the geomechanics is based on the in-situ stresses and rock properties that were obtained from wireline logging data. The mud pressure window and the mud weight are then calculated using the results of the study. The results of the exercise are then used to predict the mud weight window for the next development well. Hence, we can minimize non-productive time NPT and the cost of drilling significantly by preventing some drilling problems. Based on the IP results, the mud pressure window is calculated and a mud weight is recommended for the Abu Gabra SW-1 , and can be calibrated for the next development well. Based on the field geomechanical model, wellbore stability analysis was applied to find the mud weight in which a well is stable when having no safe mud weight window