Open AccessProductivity and injectivity of horizontal wells. Quarterly report, July 1--September 30, 1996
Author(s) -
K Aziz,
T A Hewett
Publication year - 1996
Language(s) - English
Resource type - Reports
DOI - 10.2172/446296
Subject(s) - productivity , permeability (electromagnetism) , petroleum engineering , production (economics) , horizontal and vertical , reservoir simulation , reservoir engineering , geology , computer science , geodesy , petroleum , economics , paleontology , genetics , macroeconomics , membrane , biology
This quarterly report reports on the efforts on Task 2, effects of reservoir heterogeneities on performance prediction of horizontal wells. Performance prediction of horizontal and non-conventional wells based on both analytical and numerical tools rarely match actual performance. Even a history matched case with sufficient production data fails to give reliable predictions for long times. In this study the authors explore reasons for the inability of predictive tools to make accurate predictions. They consider a case where a vertical well has been drilled and cored. Then, they generate twenty consistent geostatistical descriptions of permeability and porosity that are all constrained to hard data obtained from the vertical well. Simulations with these realizations show large differences in production rate, WOR and GOR predictions as a result of variations in reservoir properties. It is also shown that the effect of well index (WI) on simulation results is large. Furthermore, for the example considered, analytical models for critical rate and productivity calculations were found to have limited practical use