Wells – Processes – Placing fluid into the formation
Patent
1978-11-07
1981-04-14
Novosad, Stephen J.
Wells
Processes
Placing fluid into the formation
166292, E21B 4322
Patent
active
042614228
ABSTRACT:
Disclosed is a method for treating subterranean formations such as underground petroleum-containing formations penetrated by a well, and particularly a formation penetrated by a producing well which formation contain a plurality of zones, one or more of which are producing petroleum and one or more of which are producing water. The treatment selectively reduces the permeability of the water-producing intervals without adversely affecting the permeability of the oil producing intervals, thereby reducing the production of water and reducing the water-oil ratio of the fluid being produced from the well. The treatment method involves introducing an effective amount of a liquid comprising a hydrocarbon having dispersed therein an unhydrated water swellable clay such as bentonite, a sodium montmorillonite. The clay swells on contacting water in the water-producing intervals and plugs or reduces the permeability of the flow channels in the water-producing intervals.
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Noles John R.
Walker Clarence O.
White Nikolas F.
Kulason Robert A.
Novosad Stephen J.
Park Jack H.
Ries Carl G.
Suchfield George A.
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