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US 9,284,482 B2Granted
Acidic internal breaker for viscoelastic surfactant fluids in brine
AssigneeSchlumberger Technology Corporation
InventorsLeiming Li, Lijun Lin, Carlos Abad, Toan Bui
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Abstract
Compositions and methods are given for delayed breaking of viscoelastic surfactant gels inside formation pores, particularly for use in hydraulic fracturing. Breaking inside formation pores is accomplished without mechanical intervention or use of a second fluid. Acidic internal breakers such as sulfuric acid and nitric acid are used. The break may be accelerated, for example with a free radical propagating species, or retarded, for example with an oxygen scavenger.
Claims14
An oilfield treatment composition comprising
- an aqueous fluid,
- a non-polymeric viscosifier,
- a corrosion inhibitor,
- a free radical propagating agent selected from the group consisting of metabisulfites, and reducing tri-, oligo- and poly-saccharides, and
- an acidic internal breaker, wherein said acidic internal breaker is present in an amount of from about 0.01 wt % to about 1 wt % of the oilfield treatment composition, and is a delayed internal breaker that is capable of reducing viscosity of a well fluid that is present inside a subterranean formation.
2 more elements
Dependencies are inferred from the claim text.