Method of drilling a borehole with magnetic filter-cake removal

Details Method of drilling a borehole with magnetic filter-cake removal Method of drilling a borehole with magnetic filter-cake removal

E - Fixed Constructions

21

B

E21B 37/00 (2006.01) C09K 8/03 (2006.01) C09K 8/52 (2006.01)

Patent

CA 2464936

A method of drilling a borehole in an earth formation is provided, comprising the steps of: a) inserting a plurality of selected solid magnetisable particles into the borehole, the particles being susceptible of forming a filter cake layer at the borehole wall; b) drilling a section of the borehole; and c) removing at least part of the filter-cake layer from the wall of said drilled borehole section by inducing a selected magnetic field in the borehole, withdrawing the particles from said wall.

L'invention concerne un procédé de forage d'un puits dans une formation terrestre, consistant: a) à introduire dans le puits de nombreuses particules magnétisables de solide sélectionné, ces particules étant susceptibles de former une couche de gâteau filtrant sur la paroi du puits, b) à forer une section du puits, et c) à éliminer au moins une partie de la couche de gâteau filtrant de la paroi de ce puits par induction d'un champ magnétique sélectionné dans le puits, ce qui permet d'extraire les particules de la paroi.

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