Abstract: A chemical tracer particle can include a polymer core, a tracer chemical embedded in the polymer core, and an outer layer surrounding the polymer core, the outer layer including a surfactant. A method of tracing flow of well fluid from each of multiple stages in a well can include injecting into each stage a respective one of multiple chemical tracers, each of the chemical tracers including chemical tracer particles, each of the chemical tracer particles including a polymer core, a tracer chemical embedded in the polymer core, and an outer layer surrounding the polymer core, the outer layer including a surfactant, and producing the chemical tracers from the stages. A method of producing a chemical tracer particle can include generating a polymer core having a tracer chemical embedded therein, and surrounding the polymer core with an outer layer including a surfactant.