Inert tracer signals validate refracturing efficacy
To optimize its future horizontal well program, an operator conducted intensive formation testing of multiple shale intervals in a key vertical exploration well in Colombia. The main objective was to determine fracture height using both pre- and post-frac logs with a pulsed neutron capture (PNC) tool, which would be used in conjunction with injection tests to determine reservoir production capacity and formation closure pressure. Radioactive tracers would typically be added into the proppant slurry to perform a similar evaluation but due to environmental restrictions with their associated half-lives, an alternate solution was needed to acquire the necessary reservoir data.
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