Invertible well bore servicing fluid

A method for using an invert emulsion fluid in a well bore, comprising:

• (a) placing an invert emulsion fluid in a well bore, wherein the invert emulsion fluid comprises:
• (i) an oleaginous fluid;
• (ii) a non-oleaginous fluid;
• and
• (iii) an emulsifier comprising one or more amines generally represented by the formula:
• R is a radical selected from the group consisting of abietyl, hydroabietyl, dihydroabietyl, tetrahydroabietyl, and dehydroabietyl, each R′ may be the same or different and is an alkyl having from about 1 to about 3 carbons, each A may be the same or different and is NH or O, and the sum of x and y ranges from about 1 to about 20;
• and
• (b) contacting the invert emulsion fluid with an acid solution to reversibly convert the invert emulsion to an oil-in-water emulsion, wherein the invert emulsion fluid further comprises:
• a gelling agent comprising a ferric iron or aluminum polyvalent metal salt of a phosphonic acid ester, the phosphonic acid ester being generally represented by the formula:
• wherein R is an alkyl group having from about 8 to about 24 carbon atoms and R′ is an alkyl group having from about 1 to about 4 carbon atoms;
• a proppant material;
• and
• an effective amount of a delayed gel breaker to break a gel formed by the gelling agent and the oleaginous fluid.