MLchartDataset catalogue

Unsteady state

Term · Oil and gas · MLC-T-OAG-003995

A condition in a reservoir where fluid flow properties, such as pressure, saturation, or flow rate, change with time. This contrasts with steady-state flow, where these properties remain constant. Unsteady-state analysis is applied in well testing to determine reservoir characteristics like permeability and skin factor from pressure transient data.

Table 1. Record
IdentifierMLC-T-OAG-003995
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-003995",
  "term": "Unsteady state",
  "field": "Oil and gas",
  "definition": "A condition in a reservoir where fluid flow properties, such as pressure, saturation, or flow rate, change with time. This contrasts with steady-state flow, where these properties remain constant. Unsteady-state analysis is applied in well testing to determine reservoir characteristics like permeability and skin factor from pressure transient data.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/unsteady-state/"
}

Record 4,243 of 4,468 in Oil and gas terminology (MLC-0103). Request the full dataset.