Wells – Processes – Separate steps of fracturing or attacking formation
Patent
1988-09-12
1990-04-17
Suchfield, George A.
Wells
Processes
Separate steps of fracturing or attacking formation
166295, 166299, 166300, 166307, E21B 33138, E21B 43263, E21B 4327
Patent
active
049171852
ABSTRACT:
A process for improved acidizing in carbonate formations, where controlled pulse fracturing (CPF) is utilized in combination with a retarded acid and a solidifiable gel. The solidifiable gel forms a solid formation gel in a zone of greater permeability and a gel plug in the wellbore. Said gel is formed from a melamine formaldehyde resin and a cross-linkable polymer. An inhibited acid is placed in an interval of said formation having lessened permeability. The retarded acid comprises hydrochloric, formic, acetic acid or mixtures thereof which is placed in a wellbore adjacent the area to be treated. Said acid can contain retarders and corrosion inhibitors sufficient to make said acid stable in the wellbore. At least one CPF device is placed in said acid near the interval to be treated. Upon detonation of said device, acid is forced into the interval of lessened permeability, thereby enhancing the acidizing treatmemt.
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Jennings, Jr. Alfred R.
Jones Lloyd G.
Shu Paul
Malone Charles A.
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Suchfield George A.
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