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.
Olu, M (2021). Theoretical Justifications For Rate Decline Trends In Solution-Gas Drive Reservoirs, And Reservoir Property Estimation Using Production Data. Afribary. Retrieved from https://tracking.afribary.com/works/theoretical-justifications-for-rate-decline-trends-in-solution-gas-drive-reservoirs-and-reservoir-property-estimation-using-production-data-1
Olu, MOSOBALAJE "Theoretical Justifications For Rate Decline Trends In Solution-Gas Drive Reservoirs, And Reservoir Property Estimation Using Production Data" Afribary. Afribary, 20 May. 2021, https://tracking.afribary.com/works/theoretical-justifications-for-rate-decline-trends-in-solution-gas-drive-reservoirs-and-reservoir-property-estimation-using-production-data-1. Accessed 09 Nov. 2024.
Olu, MOSOBALAJE . "Theoretical Justifications For Rate Decline Trends In Solution-Gas Drive Reservoirs, And Reservoir Property Estimation Using Production Data". Afribary, Afribary, 20 May. 2021. Web. 09 Nov. 2024. < https://tracking.afribary.com/works/theoretical-justifications-for-rate-decline-trends-in-solution-gas-drive-reservoirs-and-reservoir-property-estimation-using-production-data-1 >.
Olu, MOSOBALAJE . "Theoretical Justifications For Rate Decline Trends In Solution-Gas Drive Reservoirs, And Reservoir Property Estimation Using Production Data" Afribary (2021). Accessed November 09, 2024. https://tracking.afribary.com/works/theoretical-justifications-for-rate-decline-trends-in-solution-gas-drive-reservoirs-and-reservoir-property-estimation-using-production-data-1