| 摘要 |
The process of initiating and/or extending a fracture in a subterranean formation penetrated by a wellbore which comprises injecting a crosslinked aqueous gelled fracturing fluid through the wellbore and against the formation at a flow rate and pressure sufficient to initiate and/or extend a fracture in the formation is improved by including in the fracturing fluid at least one compatible, water-soluble, aliphatic, cationic polymer bearing a plurality of pendant quaternary ammonium groups. Said pendant quaternary ammonium groups are separated from the polymer backbone by at least two carbon atoms and have an ethylene, -CH2CH2-, as one of the substituents chemically bonded to the nitrogen atom. As an example, a homopolymer of CH2=C(CH3)C(O)OCH2CH2(+)N(CH3)3Cl(-) proved to be an excellent additive to a hydraulic fracturing fluid comprising an aqueous solution of hydroxypropylguar crosslinked with borate ions at a pH of from about 8.5 to 10.
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