Method for using tracer flowback for estimating influx volumes of fluids from different influx zones

摘要

A method of estimating influx profile (qi) for well fluids (oil, gas, or water) to petroleum well (1) with influx locations (3, 31, 32, 33) to a production flow (F), comprising: - arranging tracer sources (4, 41, 42, 43) with tracer materials (4m, 41m, 42m, 43m) in levels of the well, arranged downstream and exposed to the fluids in said influx zones (3, 31, 32, 33), - each said tracer sources (4, 41, 42, 43) having even release rate (qt41, qt42, qt43... ) to said well fluid, - inducing a transient in the production rate (q) of the entire production flow (30) by shutting in by a valve topside, changing the local exposure times of the tracer sources (4, 41, 42, 43) to the fluid, e) collecting samples (c ), downstream at known sampling times (t1, t2,... ), - analysing said samples (c N, c N+1,... ) for concentration (4c) and type of tracer material (4m) from said possible sources (4), - based on said concentrations (4c) and their sampling sequence and the well geometry, calculating influx volumes (qi) from flow models.