Boring or penetrating the earth – With signaling – indicating – testing or measuring
Reexamination Certificate
2006-11-21
2006-11-21
Suchfield, George (Department: 3676)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
C073S152190, C073S152430, C175S065000, C175S072000, C507S140000, C507S141000, C507S145000
Reexamination Certificate
active
07137459
ABSTRACT:
The invention discloses methods of formulating an alkali metal silicate-containing drilling fluid and drilling a well therewith. Thus an alkali metal silicate is added to an aqueous base drilling fluid, when the drilling fluid is being circulated while drilling, at a rate sufficient to react with the drilled cuttings and freshly exposed surface of the borehole while leaving very little excess soluble silicate in the drilling fluid circulated to the surface. The rate of addition of the silicate is based on the circulation rate of the drilling fluid in the wellbore and the volume of the hole being drilled.
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patent: 3259189 (1966-07-01), Darley
patent: 3679001 (1972-07-01), Hill
patent: 3746109 (1973-07-01), Darley
patent: 4988450 (1991-01-01), Wingrave et al.
patent: 5211250 (1993-05-01), Kubena et al.
House Roy F.
Newpark Drilling Fluids
Suchfield George
LandOfFree
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