Thurman D Mcpherson

US Patent:

55312721, Jul 2, 1996

Filed:

Mar 28, 1995

Appl. No.:

8/413026

Inventors:

Ricky C. Ng - Dallas TX
Thurman W. McPherson - Cortez CO

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

E21B 2910
E21B 33138
E21B 4324

US Classification:

166277

Abstract:

A method for zone isolation or replacing a damaged or corroded casing with a solid plastic is described herein. A resin/curing agent mixture sufficient to form a hardened plastic or solid, underwater and/or at low wellbore temperatures that is also able to withstand downhole stresses, is placed into the wellbore so as to bind with the undamaged casing and close off any thief zone. Subsequently, the resin/curing agent mixture forms a hardened solid. The hardened solid is milled out if necessary so as to form a resinous casing the size of the original casing. Later, the hardened resinous casing is perforated to communicate with a targeted zone. Perforation is not required when isolating a zone. The hardened solid is of a strength sufficient to withstand stresses generated during EOR operations such as carbon dioxide or steam-flooding. Said solid is also resistant to workover acids and other chemicals used in EOR operations.

US Patent:

54049504, Apr 11, 1995

Filed:

Mar 19, 1993

Appl. No.:

8/035101

Inventors:

Ricky C. Ng - Dallas TX
Thurman W. McPherson - Cortez CO

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

E21B 2910
E21B 33138
E21B 4324

US Classification:

166277

Abstract:

A method for zone isolation or replacing a damaged or corroded casing with a solid plastic is described herein. A resin/curing agent mixture sufficient to form a hardened plastic or solid, underwater and/or at low wellbore temperatures that is also able to withstand downhole stresses, is placed into the wellbore so as to bind with the undamaged casing and close off any thief zone. Subsequently, the resin/curing agent mixture forms a hardened solid. The hardened solid is milled out if necessary so as to form a resinous casing the size of the original casing. Later, the hardened resinous casing is perforated to communicate with a targeted zone. Perforation is not required when isolating a zone. The hardened solid is of a strength sufficient to withstand stresses generated during EOR operations such as carbon dioxide or steam-flooding. Said solid is also resistant to workover acids and other chemicals used in EOR operations.