Pore Pressure and Fracture Pressure Gradient Evaluation for Sejahtera-01 Well and Bahagia-01 Well

Abstract

This research is about to evaluate pore pressure, fracture pressure gradient, with additional information of drilling problems analysis that conducted on wells that have been drilled before. The aim of this research is to evaluate the pore pressure and fracture pressure gradients from drilled well and also providing knowledge in simulating of pore pressure, and fracture pressure using JewelSuite Software. In this research overburden pressure is calculated using the density log, density acoustic, and exponential density trendline. After that both parameters will be calculated using the overburden stress equation. Pore pressure is calculated using the Eaton’s method, Eaton’s method was applied due to the mechanics of the observed basin is undercompaction state and unloading condition. Fracture pressure is calculated using Stress Horizontal Minimum, Stress horizontal minimum was applied to this research because the observed basin is extensional basin. Drilling problem that analyzed only problems that related with pore pressure and fracture pressure event. The result of this research is an evaluation of pore pressure and fracture pressure gradient which can be further developed into 1-D Geomechanics Modeling which will produce output in the form of drilling recommendations to minimize NPT caused by unsolved drilling problems.