Patent ID: 9594070
Date: 2017-03-14
CPC Classifications: C09K,E21B,G01N

Claim:
1. A method of fracturing and tracing crude oil production from a subterranean formation, said method comprising the steps of: (a) injecting an aqueous fracturing fluid into a fracturing zone of a subterranean formation wherein: at least a portion of said aqueous fracturing fluid includes an amount of a tracer composite material, said tracer composite material comprises a tracer on a solid carrier material, said carrier material is substantially non-soluble in water, said carrier material is activated charcoal, said aqueous fracturing fluid comprises water and a proppant material, said tracer composite material is different from said proppant material, said tracer is oil soluble, said tracer is substantially inert with respect to said aqueous fracturing fluid, said tracer is chemically stable under all conditions in said subterranean formation so that said tracer does not substantially react with other substances or form other products in said subterranean formation, and said tracer is a halogenated benzoic ester having a formula wherein each x in said formula is a chlorine, fluorine, bromine, or hydrogen atom, at least one x in said formula is a chlorine, fluorine, or bromine atom, and R is a straight chained, branched chained, or aromatic hydrocarbon constituent group having from 1 to 10 carbon atoms, and (b) analyzing a crude oil product or a crude oil phase of a product recovered from a well associated with said subterranean formation for a presence of said tracer in said crude oil product or said crude oil phase of said product to determine whether said crude oil product or said crude oil phase of said product includes crude oil produced from said fracturing zone, wherein step (b) comprises (i) adding a NaOH solution to said crude oil product or said crude oil phase of said product recovered from said well to hydrate said tracer to produce a halogenated benzoate which separates from said crude oil product or said crude oil phase of said product into an aqueous phase and then (ii) analyzing said aqueous phase for said halogenated benzoate.