Cristin-resultat-ID: 731980
Sist endret: 28. mars 2014, 03:01
NVI-rapporteringsår: 2010
Resultat
Vitenskapelig artikkel
2010

Experimental Investigation of the Magnetic Shielding Effect of Mineral Powders in a Drilling Fluid

Bidragsytere:
  • Songxiong Ding
  • Biplab K. Datta
  • Arild Saasen og
  • Per Amund Amundsen

Tidsskrift

Particulate Science and Technology
ISSN 0272-6351
e-ISSN 1548-0046
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2010
Volum: 28
Hefte: 1
Sider: 86 - 94

Importkilder

Scopus-ID: 2-s2.0-77951130154
Isi-ID: 000274799300006

Beskrivelse Beskrivelse

Tittel

Experimental Investigation of the Magnetic Shielding Effect of Mineral Powders in a Drilling Fluid

Sammendrag

Magnetic contamination of the drilling fluid shields the Earth's magnetic field measured by the magnetic sensors, and may contribute significantly to errors in directional surveying of a wellbore. A series of laboratory measurements were performed to investigate such magnetic shielding effects. In the measurement, a single axis fluxgate magnetometer was immersed in model drilling fluids prepared by mixing powders of known magnetic properties (magnetite and pure iron) into a solution of xanthan gum in fresh water, whereafter the vertical component of the Earth's field inside the fluid was measured. It was found that the strong shielding effect of dry iron powder essentially vanished when was suspended in the drilling fluid. The magnetic shielding caused by magnetite, however, remained significant also in solution, showing a complex dynamical behaviour. Initially the magnetic field was significantly damped, and this shielding was found to increase further for the next hour or so, reaching a fairly sharp maximum. The shielding then started to decay slowly and irregularly again over the next few days.

Bidragsytere

Songxiong Ding

  • Tilknyttet:
    Forfatter
    ved Prosessteknologi ved SINTEF AS

Biplab Kumar Datta

Bidragsyterens navn vises på dette resultatet som Biplab K. Datta
  • Tilknyttet:
    Forfatter
    ved Prosessteknologi ved SINTEF AS

Arild Saasen

  • Tilknyttet:
    Forfatter
    ved Institutt for energi- og petroleumsteknologi ved Universitetet i Stavanger

Per Amund Amundsen

  • Tilknyttet:
    Forfatter
    ved Institutt for matematikk og fysikk ved Universitetet i Stavanger
1 - 4 av 4