Título del libro: Spe Latin American And Caribbean Petroleum Engineering Conference Proceedings
Título del capítulo: Unsteady and pseudo-steady state characterization of matrix and fracture systems for multiple size blocks with the use of empirical correlations
GABRIELA MORALES GERMAN; EDGAR RENE RANGEL GERMAN; FERNANDO SAMANIEGO VERDUZCO; HEBER CINCO LEY;
Autores externos:
Idioma:
Inglés
Año de publicación:
2010
Palabras clave:
Block sizes; Diffusivity equation; Dimensionless variables; Empirical correlations; Fracture systems; Fractured porous media; Fractured reservoir; General solutions; Initial values; Interporosity flow coefficient; Laplace domains; matrix; Pressure curve; Pseudosteady state; Reservoir parameters; Stehfest algorithm; Time domain; Uniform distribution; Well-test analysis; Enhanced recovery; Fracture; Laplace equation; Laplace transforms; Oil wells; Petroleum analysis; Petroleum engineering; Porous materials; Time domain analysis; Well testing; Petroleum reservoir evaluation
Resumen:
This paper presents solutions to the pressure diffusivity equation for fractured porous media including multiple block sizes with a uniform distribution, for both unsteady and pseudo-steady states by means of dimensionless variables, the Laplace transform, and the Stehfest algorithm. The general solution was validated through the classic Warren & Root single-sized block distribution and pseudo-steady state model. It is common that in transient well test analysis, generalized plots of the models' solutions are used. In this paper plots in time domain: "pwD vs. t D" and "tD [d(pwD)/dtD] vs. tD," as well as in Laplace domain: "spwD vs. 1/s" and "s[d(spwD)/ds] vs. 1/s" are presented, showing the influence of the parameters that more strongly influence the behavior of the solutions, such as the matrix storativity ratio (?m), fracture storativity ratio (?f), maximum interporosity flow coefficient (?max); and minimum interporosity flow coefficient (?min). As is known, the derivative pressure curve is more sensitive to the variation of these parameters, providing very valuable information about the reservoir. Thus, various plots including the derivative of dimensionless pressure in both time and Laplace domains, such as tD[d(pwD)/dt D]min and s[d(spwD)/ds]min, and their behavior with respect to reservoir parameters were also analyzed. From these plots, empirical and easy-to-evaluate correlations were obtained. Using these correlations, it is possible to calculate initial values for the parameters that characterize fractured reservoirs: ?m0, ?f0, ?max0, ?min0, h max0, and hmin0. These initial values are very close to the real ones; therefore, ?m, ?f, ?max, ?min, hmax, and h min are rapidly found. Copyright 2010, Society of Petroleum Engineers.
Entidades citadas de la UNAM:
ISBN:
9781617821837
Editorial:
Tipo de producto:
Conference Paper
