Simultaneous Property Modifications for History-Matching Thousands of CSG Wells Efficiently

Presenter:

Andrew Dean

Andrew is a Reservoir Engineer at QGC in Brisbane working in the reservoir modelling team, he holds BSc in Petroleum Engineering from University of Adelaide (Class of 2016). Prior to QGC Andrew worked for Origin.

Short Presentation Abstract:

Current full-field models at Queensland Gas Company (QGC) typically contain thousands of coal-seam gas (CSG) wells, spanning ~4,000 sq.km. The goal of history matching individual wells in these models at a well level can present a significant challenge. Previous methods applied in QGC were to history match to a field level and more recently to apply well level property modifiers in a semi-automated workflow to match produced volumes at a well level. The new method, implemented through python, can attempt to minimise multiple match metrics (pressure mismatch, rate mismatch, etc.) through the modification of multiple different reservoir grid properties in a single iteration, at a well-level, resulting in fewer iterations to converge on a satisfactory history-match.