Bug Fixes

1. When forecasting SURVEILLANCE=ON and a well’s final historical gas rate is zero, a non-zero gas rate would sometimes be forecasted. 
2. When forecasting SURVEILLANCE=ON runs, wells with less than three historical rates for a particular phase are correctly forecasted.

Enhancements

1. When reading .EGRID/.INIT files and TRANS keywords are not found in the .INIT file, 3DSL will now recompute all connections across faults, pinchouts, and gaps and may generate NNCs.  Previously 3DSL was assuming there were no NNCs for such a grid, unless explicitly defined in the NNCHEAD arrays of the .EGRID/.INIT files.

Bug Fixes

Enhancements

1. Reverted a change introduced in V2021.0630 which would reuse the matrix setup when recalling SAMG within a timestep.  The setup is no longer reused when SAMG is recalled.  This may slightly increase runtimes for some models but will avoid excessive runtimes when there are substantial numbers of wells backflowing.  

Bug Fixes

1. When reading the FAULTS keyword, an out of memory error would occur if a fault contained more than 32,000 separate line entries.

Bug Fixes

1. The cumulative reservoir produced/injected volumes for boundaries when SURVEILLANCE=ON were not being output correctly.

This is a major new release of 3DSL. Due to the below enhancements, results will not be identical to the previous release version.
Enhancements

Bug fixes

1. For cases where 2 open wells share a connection in the same blk and this warning is issued ‘! WARNING. OPEN WELLS AAA & BBB SHARE BLK IJK= 1 2 3’, sometimes both connections were shut in.

Bug Fixes

1. When forecasting and SURVEILLANCE=ON,
   1. If a producer was shut at the final timestep, a valid forecast correlation model was not computed.  Well could not be properly reopened.
   2. For incompressible PVT, forecast correlation might fail unnecessarily if a producer’s history contained negative pressures.  Now include historical data associated with negative pressures.

Bug Fixes

1. Boundary efflux rates were not properly computed when SURVEILLANCE=ON and in forecast mode.
2. If negative saturations are computed in well pair bundles for SURVEILLANCE=ON and the MODEL=FCM or LIVEOIL and these bundles are connected to effluxing open boundaries, the negative saturations are now reset to zero.  Only positive saturations can efflux from open boundaries.
3. Bug fix to read/write of .rst files for SURVEILLANCE=ON runs.

Enhancements

Bug Fixes

1. 3DSL sometimes crashed if a later timestep contained no open wells, opened boundaries, and incompressible PVT, where the pressure solution had no pressure gradients.
2. HISTGAS rates for a well were not echoed for timesteps where the well had no HISTOIL or HISTWAT defined and HISTFREEGAS=OFF.
3. ‘NAMES’ vector was not written to the .SMSPEC file if all wells names were 8-char or less but well group names were more than 8-chars.

Enhancements