Patent ID: 9045675
Filing Date: 2015-06-02
Classification: C09K

Abstract:
1. A method comprising displacing a first oil-based fluid present in an open hole interval of a wellbore with a second fluid; and contacting the second fluid with an acidic indigenous formation fluid for a period of time sufficient to produce a third fluid from at least a portion of the second fluid, wherein the second fluid comprises a reversible invert emulsion comprising an aqueous fluid dispersed as a discontinuous phase within an oleaginous fluid, and an amine surfactant, wherein the amine surfactant is selected such that contacting the second fluid with the acidic indigenous formation fluid for the sufficient period of time protonates at least a portion of the amine surfactant in the second fluid to produce the third fluid comprising an emulsion comprising the oleaginous fluid dispersed as a discontinuous phase within the aqueous fluid, wherein at least 40 vol % of any non-proppant solids present in the second fluid are water-soluble at a pH of less than or equal to 6.5.