Lloyd D Jones

US Patent:

54353890, Jul 25, 1995

Filed:

May 18, 1993

Appl. No.:

8/063201

Inventors:

Paul Shu - Cranbury NJ
Lloyd G. Jones - Dallas TX
E. Thomas Strom - Dallas TX
Charles S. Yeh - Plano TX

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

E21B 33138
E21B 4322

US Classification:

166276

Abstract:

A cement 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 borehole's casing at a washed-out interval of the formation, sand is introduced into the interval. Afterwards, an aqueous silicate solution 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 containing an alkylpolysilicate is injected into the interval. A permeability retaining silica cement is formed in the interval thereby making a gravel pack. Injection of the aqueous silicate and organic solvent containing an alkylpolysilicate is continued until the interval has been consolidated by the silica cement to an extent sufficient to exclude sand and formation fines.

US Patent:

52112357, May 18, 1993

Filed:

Dec 19, 1991

Appl. No.:

7/810648

Inventors:

Paul Shu - Cranbury NJ
Lloyd G. Jones - Dallas TX
E. Thomas Strom - Dallas TX
Charles S. Yeh - Plano TX

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

E21B 33138
E21B 4322

US Classification:

166270

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 borehole's casing at a washed-out interval of the formation, sand is introduced into the interval. Afterwards, an aqueous silicate solution 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 containing an alkylpolysilicate is injected into the interval. A permeability retaining silica cement is formed in the interval thereby making a gravel pack. Injection of the aqueous silicate and organic solvent containing an alkylpolysilicate is continued until the interval has been consolidated by the silica cement to an extent sufficient to exclude sand and formation fines.

US Patent:

52190269, Jun 15, 1993

Filed:

Dec 19, 1991

Appl. No.:

7/810665

Inventors:

Paul Shu - Cranbury NJ
William P. Donlon - Dallas TX
E. Thomas Strom - Dallas TX
Lloyd G. Jones - Dallas TX

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

E21B 33138
E21B 4304
E21B 4327

US Classification:

166278

Abstract:

A method for gravel packing perforations in a wellbore where an acid is directed into the perforations so as to dissolve formation fines in channels contained in said perforations. The acid is of a strength sufficient to dissolve said fines. After the fines are dissolved, a three slug sand consolidating agent is introduced into the perforations before the channels can be filled with formation fines. The consolidating agent remains in the perforations for a time sufficient to form a silicate cement in situ which cement has permeability retentive characteristics. The cement forms pores of a size sufficient to exclude formation fines from the wellbore. Thereafter, the wellbore is packed with gravel to remove any escaping fines from hydrocarbonaceous fluids produced to the surface.