Wells – Processes – Cleaning or unloading well
Patent
1992-07-08
1993-09-28
Suchfield, George A.
Wells
Processes
Cleaning or unloading well
166300, 252 8552, E21B 3708, E21B 4325
Patent
active
052479951
ABSTRACT:
The invention shows a method of degrading damaging material within a subterranean formation of a well bore using an enzyme treatment. Filter cakes and very viscous fluids are such damaging materials. The enzyme treatment degrades polysaccharide-containing filter cakes and damaging fluids which reduces their viscosity. The degraded filter cake and damaging fluid can then be removed from the formation back to the well surface. The particular enzymes utilized are specific to a particular type of polysaccharide and are active at low to moderate temperatures. The enzymes attack only specific linkages in filter cakes and damaging fluids and are active in the pH range of about 2.0 to 10.0.
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Brannon Harold D.
Rickards Allan R.
Tjon-Joe-Pin Robert M.
BJ Services Company
Firestone Susan L.
Gunter Jr. Charles D.
Suchfield George A.
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