MLchartDataset catalogue

Magnetic toolface

Term · Oil and gas · MLC-T-OAG-002259

The angle of a directional tool's toolface, measured clockwise from magnetic north in a plane cut across the hole. It is the steering reference in near-vertical holes, where inclination is below roughly 5 degrees and no usable high side exists, and it lets the driller point a bent sub or motor toward the planned azimuth. Above that inclination, surveys switch to gravity toolface referenced to the high side.

Table 1. Record
IdentifierMLC-T-OAG-002259
FieldOil and gas
SubjectDrilling
Record as JSON 
{
  "id": "MLC-T-OAG-002259",
  "term": "Magnetic toolface",
  "field": "Oil and gas",
  "definition": "The angle of a directional tool's toolface, measured clockwise from magnetic north in a plane cut across the hole. It is the steering reference in near-vertical holes, where inclination is below roughly 5 degrees and no usable high side exists, and it lets the driller point a bent sub or motor toward the planned azimuth. Above that inclination, surveys switch to gravity toolface referenced to the high side.",
  "subject": "Drilling",
  "url": "https://mlchart.com/terminology/oil-and-gas/magnetic-toolface/"
}

Record 2,413 of 4,469 in Oil and gas terminology (MLC-0103). Request the full dataset.