Determining the Oil-Water Contact While Drilling above the Transition Zone in Long Horizontal Wells: Combining 4D Seismic and Advanced Resistivity Geosteering for Improved Wellbore Placement

by Alf E. Berle, Baker Hughes

Abstract

As oil fields mature, measuring and controlling the well’s position relative to fluid contacts is becoming increasingly important. This presentation will review the methodology and results from four horizontal branches drilled in the Troll Field in 2009. 4D seismic analysis was used extensively in the planning phase to evaluate the area, whereas azimuthal resistivity measurements were introduced to improve the accuracy in placing the well 2m above the OWC. The results also highlight changes occurring in the transition zone as the OWC moves upward.

Alf E. Berle, CV

Alf E. Berle is Reservoir Navigation Manager, Baker Hughes, Norway. He has worked for Baker Hughes since 1997 and holds an MSc degree in Petroleum Technology/ Reservoir Geology from University of Bergen, Norway.