MLchartDataset catalogue

Spherical focusing

Term · Oil and gas · MLC-T-OAG-003537

A method in electrode resistivity logging in which the current electrodes are driven so that the measuring current spreads into the formation along spherical equipotential surfaces, which keeps the reading on a roughly spherical region around the tool and reduces the effect of the borehole and adjacent beds. It is the principle of the spherically focused log, SFL, a shallow device run with dual induction tools. Unlike induction, it passes current through electrodes in contact with the mud, so it needs a conductive mud.

Table 1. Record
IdentifierMLC-T-OAG-003537
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-003537",
  "term": "Spherical focusing",
  "field": "Oil and gas",
  "definition": "A method in electrode resistivity logging in which the current electrodes are driven so that the measuring current spreads into the formation along spherical equipotential surfaces, which keeps the reading on a roughly spherical region around the tool and reduces the effect of the borehole and adjacent beds. It is the principle of the spherically focused log, SFL, a shallow device run with dual induction tools. Unlike induction, it passes current through electrodes in contact with the mud, so it needs a conductive mud.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/spherical-focusing/"
}

Record 3,751 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.