Analyzing average rig time and ease of drilling in Indian sedimentary basins: an informative tool for exploration decision-making

Abstract

Hydrocarbon exploration entails complex and costly endeavors, with drilling activities accounting for the highest expenses. To facilitate informed decision-making for geoscientists and investors, this study presents a template highlighting the average rig days and drilling ease in Indian sedimentary basins. Leveraging data from over 19,000 wells across these basins, a comprehensive analysis was conducted. While the physics and chemistry of drilling are well understood, uncertainties arise from local geological conditions, well specifications, contractor expertise, timely rig availability, market factors, and local regulations. By filtering out extreme rig times affected by these factors, average rig time (ART) and average total depth (ATD) were calculated for each basin using a simple averaging approach. ART was visualized as a basin-wise bubble map, providing an overview of the drilling duration required to reach total depth. This aids in estimating drilling costs for future wells in relatively unexplored areas. Additionally, a contour map incorporating basin-wise ATD was generated, offering insights into structural variations and basement configurations. Combining ART and ATD, a single factor known as the ease of drilling (EOD) was calculated and presented as a bubble map across Indian sedimentary basins. This map serves as a valuable tool for investors, providing information on the optimal depth and duration of drilling in each basin and aiding decision-making processes for exploration projects.