Abstract: Horizontal Wells in Rotliegendes Gas Fields - Evaluation and Optimization

SALTER, RICHARD P, MARCUS SARGINSON, D. BOARDMAN, A.A.P. TWEEDIE, and PATRICK CORBETT

A dataset comprising 22 horizontal wells in 14 fields from the Permian Rotliegendes Eolian Sandstone has been analyzed in detail. Integrated geoscience and engineering methods were applied for interpreting log and well test data, providing guidance on data collection, developing predictors for permeability and well productivity, and optimizing well location and drilled length. The data analyzed is summarized in six poster panels concentrating on the following elements.

i) Porosity - Permeability Characteristics
ii) Horizontal Well Porosity Logs
iii) Permeability Scale-Up for Eolian Dune Sequences -
Implications for Well Placement
iv) Geological Overview of Layered Rotliegendes Reservoirs
v) PI Prediction for Horizontal Wells in Rotliegendes
Reservoirs
vi) Rotliegendes Horizontal Well Production Log
Interpretation
vii) Horizontal Well Test Analysis

While the study focused on a particular geological depositional setting there is much relevance to the evaluation of horizontal wells across a range of reservoir types.

AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria