Transient wellbore/reservoir model for testing gas wells in high-temperature reservoirs, part I. Model development
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The work presents the development of a transient wellbore/reservoir model that can predict pressure and temperature at any depth during a transient test and useful even in high temperatures. The formulation involved mass, momentum and energy balances for a single-phase gas together with the PVT relation to generate the equations. The fluid flow is modeled using standard analytic approach, including superposition effects. A sensitivity study provided insights into the effect of process variables on wellbore pressure and temperature. Fluid flow rate showed significant impact on both. The temperature rating of surface equipment limit the production from some wells. Heat transport in the annulus influenced the temperature. The model also accounts for the energy absorbed by the tubulars and the cement sheaths.