Patent ID: 8756019
Filing Date: 2014-06-17
Classification: E21B

Abstract:
1. A method for estimation of Steam Assisted Gravity Drainage (SAGD) process characteristics, comprising: measuring temperature along an injection well drilled in a reservoir by downhole sensors, measuring a steam quality and an injection rate at an inlet of the injection well, estimating a pressure distribution profile along the injection well using the measured temperature, steam quality and injection rate, estimating a steam injection profile using the obtained pressure distribution profile and the measured injection rate combined with a one-dimensional injection well model for pressure losses in the well and heat exchange between an injection well tubing and an annulus, using the obtained steam injection profile as an input parameter for a set of two-dimensional cross-sectional analytical SAGD models, the models are based on energy conservation law taking into account reservoir and overburden formation properties, heat losses into the reservoir and overburden formation impact on production parameters, SAGD characteristics, and estimating the SAGD process characteristics from the set of two-dimensional cross-sectional analytical SAGD models by a computer.