Improved means of fracture acidizing carbonate formations

Details Improved means of fracture acidizing carbonate formations Improved means of fracture acidizing carbonate formations

1992-05-18

1993-08-24

Melius, Terry Lee

Wells

Processes

Placing fluid into the formation

166308, E21B 4326

Patent

active

052380670

ABSTRACT:
This invention is directed to a method to improve fracture acidizing in a carbonate containing formation. Initially, the formation is hydraulically fractured so as to form a fracture in the formation in a preferred direction. Thereafter, an acid is directed into the fracture so as to etch the fracture's face and create channels therein. Afterwards, a viscous fluid is directed into the fracture which fluid contains a material sufficient to serve as a diverter and prevent growth in the existing fracture. Once the diverting material is in place, hydraulic fracturing is again conducted within the existing fracture whereupon fracturing forces are directed away from the diverter so as to form a branched fracture to contact hydrocarbonaceous vugs in the formation. The steps of fracturing acidizing, and diverting are continued until a vuggy area in the formation has been interconnected with the fracture system.

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