MLchartDataset catalogue

Depth mark

Term · Oil and gas · MLC-T-OAG-001014

A magnetic mark placed on a wireline logging cable at regular intervals to serve as a reference for depth control. As each mark passes the surface detector it produces a pulse that is compared with the measuring-wheel reading, so slip and cable stretch show up and the depth is corrected. Marks are spaced at 100 feet or 25 meters in most systems, and some use 50 meters.

Table 1. Record
IdentifierMLC-T-OAG-001014
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-001014",
  "term": "Depth mark",
  "field": "Oil and gas",
  "definition": "A magnetic mark placed on a wireline logging cable at regular intervals to serve as a reference for depth control. As each mark passes the surface detector it produces a pulse that is compared with the measuring-wheel reading, so slip and cable stretch show up and the depth is corrected. Marks are spaced at 100 feet or 25 meters in most systems, and some use 50 meters.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/depth-mark/"
}

Record 1,085 of 4,468 in Oil and gas terminology (MLC-0103). Request the full dataset.