Eclipse simulator

Robust, reliable reference simulator

Overview

The Eclipse™ reservoir simulator offers the most complete and robust set of numerical solutions for fast and accurate prediction of dynamic behavior for all types of reservoirs and development schemes. The Eclipse simulator has been the benchmark for commercial reservoir simulation for more than 40 years due to its robust capabilities, speed, parallel scalability, and unmatched platform coverage. The simulator covers the entire spectrum of reservoir modeling, including black-oil, compositional, thermal, and streamline simulation.

Eclipse 2026 features

Eclipse 2026.3 release announcement
Eclipse 2026.2 release announcement
Eclipse 2026.1 release announcement

New user-defined argument (UDA) support in Eclipse 100 and Eclipse 300

User-defined argument (UDA) support has been added for top node pressure in the GRUPNET keyword to simplify the user input of gas compressors and allow more sophisticated gas rate optimization under velocity constraints. This facility is available in both Eclipse 100 and Eclipse 300. An option has been added to Eclipse 300 to allow compatibility with Eclipse 100 behaviour when both a fixed pressure and a vertical flow performance (VFP) table are specified for the same group.

Negative depth support in Eclipse 300

Eclipse 300 adds an option to specify a negative reference depth for wells, supporting workflows where the grid datum lies above sea level.

New and improved functionality:

Eclipse 2026.3 delivers a set of targeted improvements that strengthen stability, robustness, restart behaviour, and reporting clarity.

Eclipse 100 and Eclipse 300

                     Specifying the MULTFLT keyword in the SCHEDULE section no longer resets the threshold pressures specified in the THPRESFT keyword to the default value.
 Region separator solid composition reporting has been corrected in the PRT file.

Eclipse new features