Dynamic Temperature Analysis Under Variable Rate and Pressure Conditions for Transient and Boundary Dominated Flow

Abstract

Current analytical approaches for temperature transient analysis heavily rely on the assumption of the constant rate production, which is often invalid for the extended period of oil production. This work addresses this issue by introducing novel analytical approaches to model the temperature signal under dynamic rate and pressure conditions. The introduced methods share underlying theories of superposition principle and production rate normalization from pressure transient analysis and include a newly derived analytical solution when these theories are not applicable. With adapting these methods, cases with complex production history are modeled using analog cases producing with a constant rate. The dynamic temperature analysis developed herein is validated using synthetic temperature data both graphically and by quantitative estimation of reservoir properties. The estimation outputs of these methods include permeability, drainage area, and damaged zone properties. Other features of existing temperature transient analysis, such as fluid property correction and monitoring well surveillance, are also extended to variable rate and pressure conditions in this paper. Two cases documented in the literature are addressed by dynamic temperature analysis for which decent reservoir characterization results are obtained. The dynamic temperature analysis proposed in this paper extends the scope of temperature transient analysis to complex production constraints and demonstrates convincing results for practical purposes.

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