Wells – Processes – Providing porous mass of adhered filter material in well
Patent
1991-12-19
1993-06-29
Suchfield, George A.
Wells
Processes
Providing porous mass of adhered filter material in well
166292, 166293, 166297, 166300, E21B 33138
Patent
active
052225577
ABSTRACT:
A method for forming a gravel pack in a washed-out interval is provided where a borehole penetrates an unconsolidated or loosely consolidated oil or gas reservoir which is likely to introduce substantial amounts of sand into the borehole. After perforating the boreholes's casing at a washed-out interval of the formation, sand is introduced into the interval. Afterwards, an aqueous silicate slug is injected into said interval. Next, a spacer volume of a water-immiscible hydrocarbonaceous liquid is introduced into the interval. Thereafter, a water-miscible organic solvent slug, containing an alkylpolysilicate and an inorganic or organic salt or a chelated calcium mixture, is injected into the interval. A permeability retaining silicate cement is formed in the interval thereby making a gravel pack. Injection of the aqueous silicate slug spacer volume and organic solvent EPS mixture are continued until the porosity of the interval has been reduced by the silicate cement to an extent sufficient to exclude formation fines and sand.
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Donlon William P.
Shu Paul
Strom E. Thomas
Hager G. W.
Malone C. A.
McKillop A. J.
Mobil Oil Corporation
Suchfield George A.
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