Nonlinear Least Squares (NLS) Tracer Model

Siti Rahmawati, Sutawanir Darwis

Abstract


Tracer test is used to study possible temperature decline and cooling of production well during longterm
re-injection through studying connection between injection and production well. Tracer test
involve injecting a chemical tracer into a hydrological system and monitoring it’s recovery through
time. Concentration tracer in production well is nonlinear model. Nonlinear Least Squares Method is
proposed to estimate the tracer parameter, i.e. average fluid velocity in the channel and dispersion
coefficient, by using simulation data tracer concentration from production wells AH-4bis, AH-19, and
AH-22 in Ahuacapan, Elsavador. The results of estimation are used for predicting thermal
breakthrough and cooling production well during long term re-injection.



DOI: https://doi.org/10.29313/jstat.v9i1.992

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