Discussion of Thermal Well Test Analysis
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2016 by IJETT Journal|
|Year of Publication : 2016|
|Authors : Ashkan Jahanbani G., Tom A. Jelmert
|DOI : 10.14445/22315381/IJETT-V41P252|
Ashkan Jahanbani G., Tom A. Jelmert "Discussion of Thermal Well Test Analysis ", International Journal of Engineering Trends and Technology (IJETT), V41(6),279-284 November 2016. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Thermal recovery by steam injection is considered to be a promising method for achieving a high ultimate recovery. A composite reservoir may occur during any enhanced oil recovery (EOR) project like steam injection into an oil reservoir. Thermal falloff test analysis offers a quick way to obtain an estimate of the swept volume and steam zone properties. Most of the models used for the analysis assume two-region composite reservoirs with different but uniform properties separated by a sharp vertical interface as an impermeable boundary. The swept zone therefore acts as a closed reservoir and pressure response is characterized by pseudo steady state (PSS) behavior. Most of the studies have considered vertical wells because of the simpler method of well test analysis compared to horizontal wells. However, steam assisted gravity drainage (SAGD) process using horizontal well pairs is a promising recovery technique. Numerical simulation study of steam injection in both vertical and horizontal wells (SAGD well pairs) was done to evaluate the applicability and accuracy of thermal well test analysis method and the effects of several parameters on the results. Primary results showed that quite reasonable estimates were obtained. Some trends seen on the pressure plots, however, cannot be explained using the existing models and there are errors associated with the volume estimates that could be related to the simplifying assumptions of the conventional models.
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Composite Reservoir, Thermal Falloff Test, Pseudo Steady State, Swept Volume.