Is it possible to inject from all perforations along a well in each cell simultaneously in GEOSX?

[Razie-Sheikhansari]

Hi GEOSX team,

I'm working on a CO₂ injection model where I have a cubic domain (e.g., 1000×1000×1000 m) and a vertical injection well located at the center. I want to define a perforation in every cell along the well path so that each perforation injects CO₂ simultaneously into its surrounding cell. The goal is to ensure that injection is distributed uniformly from all perforations along the well (rather than only one or a few being active at a time).

I have already used the tags to assign perforations at regular intervals, one per cell, and the well is defined using InternalWell. However, during simulation, I observe that only a few perforations become active and others remain inactive.

My question is:
Is it possible in GEOSX to enforce simultaneous injection from all perforations along a well, and if so, what are the best practices for achieving this (e.g., well control settings, pressure targets, mesh resolution, permeability conditions)?

Thanks in advance for your guidance!

[tjb-ltk]

Hi Razie. Injection is allocated to the perforations based on the infectivity of each connected reservoir cell and pressure profile in the well. Perfs with low injection are just responding to the reservoir characterization. Currently GEOS doesn't provide controls such as maximum build up pressure or models for downhole controls devices that will help regulate the distribution of injected fluids. The max build up pressure would be the easier of the 2 in terms of development effort. But at this stage of the study if the focus is mainly to inject a fixed mass into each cell, and the wellbore physics is not of concern, then use source boundary conditions, not wells. A fixed mass will be injected into each cell and upstream wellbore pressure isn't modeled.