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US 7,855,168 B2Granted
Method and composition for removing filter cake
AssigneeSchlumberger Technology Corporation
InventorsMichael J. Fuller, Syed Ali, Laurent Pirolli, John W. Still
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Abstract
The current disclosure describes a multifunctional fluid that addresses a new concept in the removal of filter cake. A composition is disclosed comprising: a carrier fluid, a surfactant, a fluorine source and an organic stabilizer able to minimize precipitation of fluorine The associated method to remove the filter cake is also described.
Claims10
A method of removing filter cake particles from a hydrocarbon reservoir wellbore comprising:
- (i) drilling the wellbore in the hydrocarbon reservoir with a drilling fluid;
- (ii) forming a filter cake which is bridging particles over at least part of the wellbore, wherein the filter cake comprises calcium carbonate;
- (iii) contacting the filter cake with a composition comprising a carrier fluid, a surfactant, a fluorine source and an organic stabilizer;
- wherein the organic stabilizer minimizes precipitation of calcium fluoride;
- and
- (iv) allowing the filter cake particles to be dissolved by the composition.
3 more elements
Dependencies are inferred from the claim text.