New Software Release

Product overview

The Pipesim™ steady-state multiphase flow simulator is the flagship SLB well and network modeling software for steady-state multiphase flow simulation. Together with the Olga™ dynamic multiphase flow simulator, SLB provides a complete software solution for design and optimization of production systems.

These notes accompany the release of Pipesim 2026.1. The notes describe changes in Pipesim 2026.1 relative to Pipesim 2025.2. This document should be read by all users of the program. The complete program documentation consists of Pipesim simulator help, release notes, and installation guides.

The SLB Software Support Hub provides useful information about the product and a knowledge base.

Please contact SLB if problems or missing functionality are encountered when using Pipesim steady-state multiphase flow simulator or any of its related software tools.

Release updates

Enhancements in Pipesim 2026.1

• 10-dimensional multi-test well model calibration
• Advanced well-sensitivity analysis
• Branch rate constraints
• Counter flow temperature correction
• Upgrade to Multiflash 7.6
• PythonToolkit (PTK) improvements

10-dimensional multi-test well mode calibration

Pipesim 2026.1 comes with a new multi-test well calibration task. The optimization algorithm tunes up to 10 calibration parameters simultaneously to match measured well test conditions. This includes:

• Flow correlations friction and holdup factors.
• Heat transfer U-value multiplier.
• Fluid gas and water phase ratios.
• Reservoir pressure and temperature.
• Different inflow performance relationship (IPR) parameters.
• ESP and PCP derating and slippage factors.

Unlike the existing data-matching task, which involves adding the well test data into the catalogue and then importing a single test into the task, the new approach allows for direct entry of multiple well test data sets into the calibration workflow, and assigning a weighting factor to the test in case multiple tests are included in the calibration.

Advanced well-sensitivity analysis

The new sensitivity analysis workflow for the advanced well is designed to improve the user experience by enabling parametric analysis through the permutation of up to five variables. It generates a matrix of independently solved cases, which are then combined and visualized to deliver a quick and intuitive assessment for identifying optimal operating conditions.

Branch rate constraint

The rate constraint feature for the network simulation task has been extended to support intermediate branches. Previously, constraints could be set only for the terminal branches that have source/sink/well. Branches that have flowrate constraints defined must contain one or more chokes. When the network solves, the constraint is met by adjusting the bean size of the choke.

Counter flow temperature correction

To consider the effect of heat exchange between production and gas lift injection fluids at the well head zone, a new temperature correction option has been added to gas-lift injection well system. Based on user selection, the temperature can be corrected at the well head or along the tubing from the specified depth.

Upgrade to Multiflash 7.6

Pipesim 2026.1 comes with Multiflash 7.6 installed by default. For more information, refer to the Multiflash user interface.

PythonToolkit improvements

The following enhancements are available in Pipesim 2026.1 for the PythonToolkit:

• Support for spot report results:
  • Composition details
  • Stock tank fluid properties
  • Flowing fluid properties
  • Cumulative values
  • Multiphase flow values
  • Slugging values
  • Pigging values
  • Heat transfer values
• Support for user-defined metocean data
• Support for OneSubsea multiphase booster recirculating flow
• Python environment upgraded to 3.13