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US 2010/0132948 A1Published application
Delayed Breaking of Well Treatment Fluids
AssigneeSchlumberger Technology Corporation
InventorsDiankui Fu, Andrey Fedorov, Olesya Levanyuk, Eric Clum, Larisa Kochmar
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Abstract
An embodiment of a downhole method of breaking of a well treatment fluid relates to overcrosslinking a polymeric thickener with an overcrosslinking agent such as an excess crosslinking agent and/or an excess alkaline material, wherein either or both the agent and/or material may be encapsulated.
Claims22
A method of treating a subterranean formation penetrated by a well bore, the method comprising:
- injecting a treatment fluid in the well bore;
- crosslinking a hydratable polymer to viscosify the treatment fluid for at least a portion of the injection;
- and, overcrosslinking the crosslinked polymer for delayed breaking of the treatment fluid.
A method of treating a subterranean formation penetrated by a well bore, the method comprising:
- injecting into the well bore a treatment fluid comprising proppant suspended in a carrier thickened with a crosslinked polysaccharide, to deposit proppant in a fracture formed in the formation;
- thereafter overcrosslinking the crosslinked polymer to break the treatment fluid;
- flowing the broken treatment fluid through the fracture back to the wellbore.
A method comprising:
- preparing a treatment fluid and introducing the treatment fluid into a structure to be treated;
- crosslinking a hydratable polymer to viscosify the treatment fluid;
- and,
- overcrosslinking the crosslinked polymer for delayed breaking of the treatment fluid.
1 more element
Dependencies are inferred from the claim text.