Optimum
Horizontal Well Placement in Very Low Resistivity
Reservoir with a Directional and Deep Logging While Drilling Technology
Silva, Augusto
Carvalho1, Jose Cavero2, Waldyr
Rodriguez2, Marco Augusto2, Johana
Vargas2, Rommel Chacon2 (1)
SPE, SPWLA,
In the Sub-Andean basin areas of Peru,
Colombia and Ecuador, important reservoir targets present very low resistivity range and also very low resistivity
contrast between pay and non-pay. These unique conditions constitute a
challenge for the ability to map the reservoir boundaries and to allow the
successful navigation of horizontal wells in thin target zones.
Conventional logging data are not able to
effectively determine the approach or prevent the intersection of a reservoir
limit under such reservoir conditions. Therefore, they are not perceived as the
best option to optimize geosteering decision making.
A new logging while drilling technology,
developed by Schlumberger, based on electromagnetic resistivity
measurements was applied in two horizontal wells, recently drilled by Pluspetrol Norte in Peru.
The service delivered directional resistivity measurement with deep depth of investigation,
which allowed estimating the orientation, distance and resistivity
of nearby bed boundaries.
The technology was successfully used to
navigate the wells, optimizing the horizontal length inside the best productive
zone and stay at a safe distance from the OWC. The productive behaviour of those wells was better than expected.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California