New Software Release

ECLIPSE 2021.2 Now Available

Friday, 02 July 2021

Product overview

The ECLIPSE industry-reference reservoir simulator offers the industry’s 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 25 years thanks to its extensive capabilities, robustness, speed, parallel scalability, and unmatched platform coverage. The ECLIPSE simulator covers the entire spectrum of reservoir modeling, including black oil, compositional, thermal, and streamline simulation. 

Learn more about ECLIPSE

Release highlights

The 2021.2 release of the ECLIPSE suite includes developments enhancing the performance, usability and functionality capabilities of the simulators.

ECLIPSE 2021.2 Key developments

Enhanced functionality for well and connection UDQ sets

It is now possible to combine connection UDQ (user defined quantity) sets into their related well UDQ sets, and to use well UDQ sets instead of connection UDQ sets where it makes logical sense to do so. This greatly simplifies many workflows, avoiding the need to create a separate field UDQ for each well.


As part of our on-going commitment to improving the ECLIPSE simulator, ECLIPSE 2021.2 contains several changes to address issues discovered in previous releases. For instance, for both ECLIPSE100 and ECLIPSE 300:

  • An issue with connection UDQ index defaulting has been fixed. This could cause only the first matching connection be processed, rather than all matches.
  • The processing of LC (local grid connection) summary vectors in ACTIONX conditions has been improved. Previously many vectors would evaluate to zero.
  • Documentation of the summary file format has been improved to cover defaulted connection and segment indices.

Additionally, for ECLIPSE 100:

  • The processing of S (segment) summary vectors in ACTIONX conditions has been improved in parallel. Previously negative values would evaluate to zero. Additionally, the reporting of conditions involving segment summary vectors has been improved to avoid truncation.
  • The checking process for valid UDQ names has been improved to avoid spurious errors.
  • The memory requirements for models containing both multi-segment wells and local grids have been significantly reduced.

Finally, for ECLIPSE 300:

  • Oil in place reporting has been improved for cases with residual oil, and summary vectors FCRO and RCRO have been added to export field and region molar amounts of each component dissolved in residual oil.
  • Checking for validity of the EOSS keyword contents has been improved.
  • The restart and INIT file writing mechanism has been improved to avoid the situation where extremely large property values could cause the file to become internally inconsistent and invalid.