Field Applications of Coupled Temperature-Rate-Pressure Transient analysis for Reservoir Characterization: Analytical Modeling
Abstract
Pressure induced temperature transient analysis has evolved recently with the downhole temperature monitoring techniques to characterize the reservoir. In this work, we develop an analytical solution to model the temperature signals associated with variable rate production of slightly compressible fluid and apply it to several field temperature measurements to characterize the reservoir. The analytical solution presented in this paper is more applicable for field application compared to previous temperature transient analytical solutions assuming constant rate production. This model is derived from the single phase energy balance equation coupled with transient rate and pressure behaviors under boundary dominated flow. This solution is applicable to production and monitoring well temperature surveillance, for which the near wellbore region may be damaged or undamaged. In addition, we provide thermal inversion procedures to characterize the reservoir by evaluating its permeability and porosity, total compressibility and reservoir boundary. The temperature profiles obtained from the analytical solution shows good agreement with those from numerical simulation and are sensitive to total compressibility and reservoir permeability, thickness, and boundary. Sensitivity analyses of temperature profiles are performed on reservoir thickness, permeability, outer boundary radius, total compressibility, fluid specific gravity, specific heat, and viscosity. The early time temperature profiles are induced by pressure transient and followed by the late time effect of boundary dominated flow. The effects of damaged zone radius and permeability on temperature signals cause slope changes on the temporal semi-log plot. With adequate knowledge on other reservoir properties, detailed procedures are demonstrated and can lead to the interpretations of permeability, reservoir boundary, and damaged zone permeability. Several field temperature measurements are applied with the developed solution to estimate reservoir properties. The estimations are compared with available properties acquired from other methods to explore the practical purpose of this model.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFM.H23A1622M
- Keywords:
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- 1822 Geomechanics;
- HYDROLOGY;
- 1847 Modeling;
- HYDROLOGY;
- 1858 Rocks: chemical properties;
- HYDROLOGY;
- 1895 Instruments and techniques: monitoring;
- HYDROLOGY