Hydraulic fracturing process and compositions

Details Hydraulic fracturing process and compositions Hydraulic fracturing process and compositions

E - Fixed Constructions

21

B

31/21

E21B 43/26 (2006.01)

Patent

CA 1253679

-30- ABSTRACT OF THE DISCLOSURE Improved fracturing processes are described which use novel aqueous hydraulic fracturing fluids. The fluids comprise: (a) an aqueous medium, and (b) a thickening amount of a thickener composition com- prising (i) a water-soluble or water-dispersible interpolymer having pendant hydrophobic groups chemically bonded thereto, (ii) a nonionic surfactant having a hydrophobic group(s) that is capable of associating with the hydrophobic groups on said organic polymer, and (iii) a water-soluble electrolyte. Addi- tionally, the fluids preferably contain a stabilizing amount of a thiosulfate salt. As an example, an inter- polymer of acrylamide and dodecyl acrylate was used in combination with a nonionic surfactant (HLB of from 10 to 14) to thicken a dilute aqueous solution of KCl and sodium thiosulfate; the aqueous solution had excellent properties for use as a high temperature hydraulic fracturing fluid. 29, 991-F -30-

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