TITLE

COMPARISON OF STEHFEST'S AND ISEGER'S ALGORITHMS FOR LAPLACIAN INVERSION IN PRESSURE WELL TESTS

AUTHOR(S)
Escobar, Freddy Humberto; Leguízamo, Fabián Andres; Cantillo, Jose Humberto
PUB. DATE
June 2014
SOURCE
Journal of Engineering & Applied Sciences;Jun2014, Vol. 9 Issue 6, p919
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This paper presents the comparison of two algorithms used for the numerical inversion of the Laplace transform. The comparison was applied to two well-known oil-industry reservoir models in the Laplacian domain, for which the inversion is made and the results are plotted to establish comparison. Not only accuracy but also computing effort was studied. Although, the Iseger's algorithm is computationally much heavier it handles more efficiently functions with discontinuities or functions having sharp changes. It was also observed in well tests that fulfilling the conditions relating time with the number of sample points leads to more stable inversions. It was also found that the greater the number of points to be inverted, the more accurate the solution. Moreover, the oversampling parameter nrp provides more stable solutions when it takes the value of three contrary to eight as initially proposed by Iseger.
ACCESSION #
96709044

 

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