C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 5/02 (2006.01) C08J 5/24 (2006.01) C09K 8/68 (2006.01) E21B 43/267 (2006.01)
Patent
CA 2358837
It has been discovered that borate crosslinked fracturing fluid breaker mechanisms are improved by the inclusion of a ration-releasing material. When cations are released or liberated within the fracturing fluid, they complex with the hydroxide or carbonate pH buffers used within the borate crosslinked fracturing fluid, which in turn reduces the pH of the fracturing fluid. Once the pH is lowered, viscosity reduction (breaking) occurs by uncrosslinking of the polymer within the fracturing fluid, and by initiating or increasing activity of an enzyme breaker, if present. In one embodiment, the rations are divalent rations. Two specific, preferred materials for releasing divalent rations are calcium lignosulfonate and calcium chloride, the latter preferably in encapsulated form.
Baker Hughes Incorporated
Sim & Mcburney
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