Spherical flow

{
  "id": "MLC-T-OAG-003536",
  "term": "Spherical flow",
  "field": "Oil and gas",
  "definition": "A flow regime in which fluid converges on the wellbore from all directions in three dimensions, as it would toward a point sink. It occurs when only a small part of a thick formation is open to flow, for example with a partial penetration, a limited-entry completion or a formation-tester probe. On a log-log pressure derivative plot spherical flow shows a line with a slope of minus one half.",
  "subject": "Well Testing",
  "url": "https://mlchart.com/terminology/oil-and-gas/spherical-flow/"
}