Doublet Heat Sweep Model with Bounded Initial Temperature Distribution

Abstract

The SGP 1-D Heat Sweep Model has been improved to simulate production fluid cooldown under partial reinjection recharge through a fractured hydrothermal reservoir with a given temperature distribution. The model was developed as a 1-D doublet flow model with the assumption of equal and linear flow through a series of N crescents each carrying 1/N of the reinjection recharge flowrate. For a uniform initial reservoir temperature infinite in geometry for doublet flow, the heat content available above a useful abandonment temperature increases rapidly with increasing crescent number. The result is a very long cooldown time to the abandonment temperature. The iniproved model limits the volume of the reservoir at mean initial temperature to a defined geometry. In the absence of field data on temperature distribution around an isolated injection- roduction we21 pair, several ossibilitfe explored; for exampye, uniform temperature in a cylinder of ra equal to one half of the distance between the well pair, with temperature distribution decreasing as 1/N thereafter.