METHOD FOR ESTIMATION OF SAGD PROCESS CHARACTERISTICS

摘要

The invention relates to thermally stimulated oil recovery in horizontal wells, namely to the methods for estimation of Steam Assisted Gravity Drainage (SAGD) process characteristics. Method for estimation of SAGD process characteristics is characterized by the steps of measuring temperature along the injection well, measuring steam quality and injection rate at the inlet of the injection well, estimating the pressure distribution profile by using the data obtained, estimating steam injection profile by using the obtained pressure profile and injection rate combined with ID injection well model for pressure losses in the wellbore and heat exchange between injection well tubing and annulus. The obtained steam injection profile is used as an input parameter for a set of 2D cross-sectional analytical SAGD models taking into account reservoir and overburden formation properties impact on production parameters and SAGD characteristics. SAGD process characteristics are estimated on the basis of energy conservation law for condensed steam taking into account heat losses into the reservoir and overburden formation and hence the fluid production rate changing in time.