| Abstract |
Eavor is progressing a commercial-scale Eavor-Loop™ project in Geretsried, southern Germany. This first-of-a-kind project consists of multiple horizontal Eavor-Loops™ targeting the carbonate Malm Formation at a depth of 4.5 km. The drilling and execution of a closed-loop system is highly complex, which was compounded by initial uncertainties in the subsurface at Geretsried. As part of the data collection program for Loop 1, Eavor conducted a series of open-hole logging runs. Over 8 km of ultrasonic image logs were acquired in the horizontal wells, and these logs helped to resolve several critical uncertainties that had previously challenged the project. Key geomechanical observations were made on the stratigraphic and structural trends, as well as the rock mechanical failure mechanisms contributing to suspected borehole enlargement. Based on the insights from the ultrasonic image logs, the geomechanical model was revised, leading to a recommendation to adjust the drilling practices and fluid properties. Drilling results demonstrated that these modifications significantly improved performance and wellbore stability. The detailed findings from this phase of the project will be explored, and the invaluable insights gained from ultrasonic image logging will be highlighted. |