Method of drilling a borehole into an earth formation

Details Method of drilling a borehole into an earth formation Method of drilling a borehole into an earth formation

2007-01-09

2007-01-09

Bates, Zakiya W. (Department: 3676)

Boring or penetrating the earth

Processes

Boring with specific fluid

C175S057000

Reexamination Certificate

active

10495847

ABSTRACT:
A method of drilling a borehole in an earth formation wherein a plurality of selected solid magnetisable particles is inserted into the borehole, the particles being susceptible of forming a filter cake layer at the borehole wall and being made of a material susceptible of being exposed to magnetic forces when subjected to a magnetic field. A section of the borehole is drilled, and at least part of the filter-cake layer is removed from the wall of the drilled borehole section by inducing a selected magnetic field in the borehole. The magnetic field exerts magnetic forces to the particles, thereby withdrawing the particles from the wall.

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International Search Report dated Apr. 3, 2003.

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