Method of drilling through a high temperature formation

Details Method of drilling through a high temperature formation Method of drilling through a high temperature formation

1991-09-27

1993-05-11

Suchfield, George A.

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166307, 166312, 175 65, 175 72, 507140, E21B 2106, E21B 3700

Patent

active

052092976

ABSTRACT:
An improved drilling fluid for use in a drilling operation. A drilling rig has a drill string for forming a borehole while drilling fluid flows down the drill string to a drill bit and back up the borehole annulus to a mud pit. The improved drilling fluid of this method enables the borehole to be extended through a geothermal formation having a temperature up to 500 degrees F. The drilling fluid has a highly viscous thixotropic fluid added thereto during a drilling operation in order to achieve a mixture having at least 1/2% polymerized alkali metal silicate that is formed by combining an aqueous acid solution with an aqueous alkali metal silicate solution, whereby a polymerized alkali metal silicate gel is produced followed by shearing of the gel to impart thixotropic properties thereto.

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