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THEORETICAL JUSTIFICATIONS FOR RATEDECLINE TRENDS IN SOLUTION-GAS DRIVE RESERVOIRS, AND RESERVOIR PROPERTY ESTIMATION USING PRODUCTION DATA

Mosobalaje, O. O. (2011) THEORETICAL JUSTIFICATIONS FOR RATEDECLINE TRENDS IN SOLUTION-GAS DRIVE RESERVOIRS, AND RESERVOIR PROPERTY ESTIMATION USING PRODUCTION DATA. Masters thesis, AFRICAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, ABUJA.

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Abstract

Rate decline analysis is an essential tool in predicting reservoir performance and formation property estimation. The use of historical production data to predict future performance is the focus of the empirical domain of decline analysis while the theoretical domain focuses on the use of such data to estimate formation properties.A number of attempts have been made to establish the theories of rate decline in solutiongas drive reservoirs. Such attempts have established the theoretical decline exponent b as a function of formation properties. However, none of the attempts have established a direct link between the empirical and theoretical domains of decline analysis. The purpose of this work is to establish the missing link and deploy such link in reservoir property estimation. In this work, a functional relationship (equation) between the empirical (��� ) and the theoretical (���) was derived; based on the definition of a new parameter known as timeweighted average of the theoretical exponent, ��� .This new parameter was found to be related to the empirical exponent, ��� thus establishing the link. Theoretical justifications for the ranges of values of the theoretical exponent were also offered. Consequent upon the establishment of the relationship, this work developed a new improved technique for estimating reservoir permeability. The technique was applied to a number of cases and was found to yield excellent estimates of permeability even for an heterogeneous reservoir.Sensitivity analyses were performed on the results. The work also investigated non-Darcy flow effects on decline parameters. Lastly, this work provided mathematical justification for the existence of the hyperbolic family of curves in solution-gas drive reservoirs.

Item Type: Thesis (Masters)
Subjects: T Technology > T Technology (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 26 Apr 2018 09:29
Last Modified: 26 Apr 2018 09:29
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/10698

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