Capillary Pressure Curves From Centrifuge Data by Use of Spline Functions

Autor:	Jan-Erik Nordtvedt, Kristofer Kolltvelt
Rok vydání:	1991
Předmět:	Physics::Fluid Dynamics Centrifuge Capillary pressure Spline (mathematics) Capillary action Process Chemistry and Technology Mathematical analysis Curve fitting Fluid dynamics Geotechnical engineering Synthetic data Geology Numerical integration
Zdroj:	SPE Reservoir Engineering. 6:497-501
ISSN:	2469-9683 0885-9248
Popis:	Summary This paper presents a new parameter-estimation method to obtain a capillary pressure curve from centrifuge data. The wetting-phase saturation is regarded as a function of the capillary pressure curve and is approximated by a spline function. The average wetting-phase saturation can then be calculated analytically if the coefficients in the spline function are known. We formulate an optimization problem and show how to determine these coefficients—i.e., how to determine the capillary pressure curve. Neither numerical integration nor differentiation is performed at any stage in the calculation. The method fits a capillary pressure curve to the data in the interval given by the experiments without the use of the irreducible-wetting-phase-saturation concept. The presented method compares very well to synthetic data and fits a capillary pressure curve to experimental data with a high degree of accuracy. We compare the method to the Hassler-Brunner and Bentsen-Anli procedures for experimental data from a North Sea reservoir rock.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::24b2c966677ff186264f2d85c7ea7377 https://doi.org/10.2118/19019-pa Zobrazit plný text záznamu