Wells – Processes – Specific propping feature
Patent
1991-10-01
1992-11-03
Suchfield, George A.
Wells
Processes
Specific propping feature
166300, 166308, E21B 43267
Patent
active
051599791
ABSTRACT:
A method for limiting a downward growth of one or more vertically oriented fractures in a subterranean formation during a fracturing treatment. Initially, a first fracturing fluid with a known density is introduced into a formation having at least one fracture. The first fracturing fluid comprises a cross-linked gel composition sufficient to form a viscous gel in the fracture and also contains gel breakers. Thereafter, a second fracturing fluid is introduced into the fracture. This second fracturing fluid has a density lower than said first fracturing fluid. Additionally, the second fracturing fluid contains a proppant. The second fracturing fluid is continually introduced into the fracture thereby displacing the first fracturing fluid into a lower portion of the fracture where a substantially viscous gel forms. Thereafter, the first fracturing fluid breaks faster than the second fracturing fluid containing the proppant which causes the lower portion of the fracture to close while allowing the upper part of said fracture to be propped thereby limiting the downward growth of said fracture while substantially minimizing fracture intrusion into an underlying zone.
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Malone C. A.
McKillop A. J.
Mobil Oil Corporation
Speciale C. J.
Suchfield George A.
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