Borehole fluid

Details Borehole fluid Borehole fluid

C - Chemistry, Metallurgy

09

K

C09K 8/36 (2006.01) E21B 21/14 (2006.01)

Patent

CA 2448617

A water-in-oil emulsion bore hole fluid comprising oil, a brine and emulsifier wherein the oil-to-brine ratio by weight is between 10:90 and 30:70. The emulsifier has a high molecular weight in the range from 500 up to 5000 and a suitable HLB balance.

Fluide pour trou de sonde, constitué par une émulsion eau dans l'huile, caractérisé en ce qu'il comprend une saumure et un émulsifiant, et en ce que le rapport pondéral huile-saumure est compris entre 10 :90 et 30 :70. L'émulsifiant présente un poids moléculaire élevé, compris entre 500 et 5000, et un équilibre lipophile-hydrophile (HLB) approprié.

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