Gas/condensate production decline analysis using type curves
by Mohammad Taghizadeh Sarvestani; Fariborz Rashidi; Sayed Ali Mousavi Dehghani
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 14, No. 4, 2017

Abstract: Abnormal thermodynamic behaviour and multi-phase flow of gas/condensate reservoirs restrict the application of available production models to analyse production data in order to estimate reservoir properties. This study aims at development of a new analytical model to estimate initial gas-in-place, average reservoir pressure, drainage area size, permeability, and well skin from multi-phase gas/condensate production data via type curves. For this purpose, the governing flow equation of multi-phase gas/condensate reservoir is derived and by employing novel two-phase pseudo-functions, a general boundary dominated flow solution is developed for variable bottom-hole pressure/rate conditions. The effects of positive coupling and negative inertia in the near-wellbore region are also included in the formulation. Subsequently, the obtained production model is presented in type curve analysis format by using new dimensionless parameters. The proposed model is validated using different synthetic compositional models by changing different reservoir and fluid properties including reservoir fluid types, relative permeability data, and production history mode. In addition, the method is evaluated using actual field data. Results show that the proposed method estimates the reservoir properties quite well for all cases. [Received: December 1, 2014; Accepted: October 6, 2015]

Online publication date: Mon, 20-Mar-2017

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