Drilling Optimization of Tight Sands and Shale Gas Reservoir in Jambi Sub-Basin Based on Pore Pressure Estimation Using Drilling Efficiency Mechanical Specific Energy (DEMSE) and Bowers Methods

Benny Abraham Bungasalu,Don S Basuki,M Syamsu Rosid,Hadiyanto Hadiyanto,Maryono Maryono,Budi Warsito Budi Warsito

doi:10.1051/e3sconf/201912515001

Benny Abraham Bungasalu, Don S Basuki + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/201912515001

Copy DOI

Abstract

The subsurface pressure analysis is used to detect the overpressure and problems in the well that will be drilled based on exploration well data. Various problems were found while drilling operations carried out on A and B wells, namely, Kick and Pipe sticking which cause a high Non-Productive Time (NPT). This research is conducted to identify the mechanism of overpressure formation in Tight Sand Gas and Shale Gas in the Jambi Sub-Basin. Furthermore, to predict pore pressure using the Drilling Efficiency and Mechanical Specific Energy (DEMSE) and Bowers method. The final result will be a 3D pore pressure cube in the area based on quantitative analysis of post-stack seismic inversion. The results of the pore pressure analysis from the wells and the 3D pore pressure model indicate that top of overpressure occurs in the Gumai Formation, then it is decreasing gradually approaching the hydrostatic pressure on the Basement. The mechanisms of overpressure are caused by under compaction, fluid expansion (kerogen maturation). The Gumai Formation and Talang Akar Formation are shale rocks so the type of mud weight that is well used is oil based mud (OBM).

Highlights

Accurate pore pressure estimation is needed in all aspects of oil and gas exploration and development
Pore pressure prediction using the Bowers method is better than the Eaton method because it can predict high pore pressure values and the Bowers method is considered more capable of predicting the optimal mud weight value for drilling at that depth [1]
Drilling Efficiency and Mechanical Specific Energy (DEMSE) method is better than the Dxc method to determine pore pressure, because the Drilling Efficiency and Mechanical Specific Energy (DEMSE) method is considering drilling speed, rotation speed, size drill bit, up to the specific gravity of the mud in determining pore pressure and adding Torque value [2]

Summary

Introduction

Accurate pore pressure estimation is needed in all aspects of oil and gas exploration and development. The subsurface pressure analysis is carried to determine the mud weight optimum. Pore pressure prediction using the Bowers method is better than the Eaton method because it can predict high pore pressure values and the Bowers method is considered more capable of predicting the optimal mud weight value for drilling at that depth [1]. Drilling Efficiency and Mechanical Specific Energy (DEMSE) method is better than the Dxc method to determine pore pressure, because the Drilling Efficiency and Mechanical Specific Energy (DEMSE) method is considering drilling speed, rotation speed, size drill bit, up to the specific gravity of the mud in determining pore pressure and adding Torque value [2]. It is necessary to explore new resources especially unconventional resources such as shale gas

Methods

Results

Conclusion