The criticality and a means of modelling latest generation wells employing Inflow Control Device (ICD) and Autonomous Inflow Control Device (AICD) completions providing solutions to the production constraints encountered in multi-reservoir contact wells is presented in this paper. ICD-AICD wells enable a better-distributed production/injection from/into different reservoir zones/layers by adding a passive and or autonomous downhole restriction. ICD-AICD technology thereby enables more efficient field development by improving sweep efficiency, potentially reducing the number of production/injection wells required and maintaining well longevity and profitability.

Modelling the completion interaction with the reservoir is critical to determine the incremental value of applying such technology. This being achieved by coupling the wellbore model, which includes the lower completion, to the reservoir properties. The modelling technique, a grid-based numerical well/reservoir simulation, necessitates knowledgeable personnel and detailed, sometimes uncertain, geological data. The multiple model iterations required when using ICD-AICD technology further increases the reservoir simulators' computing time.

A new tool was developed to design and analyse ICD-AICD efficiency, bridging between a simple steady-state inflow snapshot evaluation and a full dynamic reservoir simulation. The new model uses the proven classical method of fractional flow, combined with the performance of specific flow control devices installed in the well. This allows fast forecasting of the production profile and oil recovery, as well as optimizing ICD-AICD configuration at the well design stage.

The proposed workflow is implemented as either a production forecast or a diagnostic tool for an ICD-AICD well in an immiscible gas or aquifer-supported oil field. It provides one missing link between today's ICD-AICD design workflows and the long-term value evaluation of a specific design when a full reservoir simulation is either not available or too time consuming. The method's transparency and ease of implementation of its algorithms can make it a useful tool for well and reservoir engineers to design and analyse the value of ICD-AICD devices.

You can access this article if you purchase or spend a download.