Compositions – Leather or fur treating
Patent
1991-12-19
1993-12-28
Geist, Gary
Compositions
Leather or fur treating
166294, E21B 33138
Patent
active
052736660
ABSTRACT:
A sand consolidation method to provide for use in a borehole having an unconsolidated or loosely consolidated oil or gas reservoir which is likely to introduce substantial amounts of sand into the borehole and cause caving. After perforating the borehole's casing at an interval of the formation where sand will be produced, an aqueous slug of hydroxide is injected into said interval. Next, a spacer volume of a water-immiscible hydrocarbonaceous liquid slug is injected into the interval. Thereafter, a water-miscible solvent slug of an alkylpolysilicate is injected into the interval. A permeability retaining silica cement is formed in the interval. Injection of aqueous hydroxide and alkylpolysilicate slugs is continued until the interval has been consolidated by the silica cement to an extent sufficient to prevent sand migration and thereby prevent caving.
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Geist Gary
Hager, Jr. G. W.
Malone C. A.
McKillop A. J.
Mobil Oil Corporation
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