A Multiparameter Methodology for Skin Factor Characterization: Applying Basic Statistics to Formation Damage Theory

Abstract

fax 01-972-952-9435. AbstractThe following paper describes a Skin Factor characterization methodology that has been developed and successfully applied in fields operated by BP in Colombia, South America. The method is based on basic statistic correlations that are applied for the ranking of different measured or estimated damage parameters; the primary purpose of the method is to weight the different formation damage mechanisms taking place in the complex reservoirs of the Colombian Foothills in such a way that multicomponent skin characterization maps can be estimated. The presence of compositional fluids, active tectonics environments, stacked reservoirs and well access issues all account for the above mentioned complexity.By the application of this methodology, the design of chemical stimulations has become more efficient as the output of the method, which is a Multi-Parameter characterization of the skin, is available for all the wells; in this manner, stimulation packages include components for the control of the main skin mechanisms in the ratios estimated by the model. The model is being continuously updated through the incorporation of measured and estimated damage related variables such as physical chemical analysis of back flowed samples (after stimulations), output from mineral and organic scaling index estimation models, laboratory studies and well intervention records, among others; all of them taken into account for the entire life of a particular well.Fed by the Multi-Parameter model, a skin characterization mapping tool has been developed and has become a key input in the periodically reviews of well productivity; stimulation and well intervention options are being efficiently ranked in terms of benefit leading also to a better planning of well work campaigns.

Disaggregation and discretization methods for formation damage estimation in oil and gas fields: an overview

“…The multi-parameter model for the skin factor characterization was proposed by Restrepo et al [16]. It is a methodology of formation damage study based on statistical correlations that allow the classification of different damage mechanisms present in a well [16,27]. The model involves six types of damage: Mineral Scale, Organic Scale, Fines Blockage, Induced Damage, Relative Permeability Parameter, and Geomechanical Damage.…”

Modelo Fenomenológico Para Escalar a Yacimiento El Impacto Sobre Producción De Hidrocarburos Del Daño De Formación Por Migración De Finos

“…La figura 5 y tabla 2 muestra la caracterización del daño de formación del pozo CuPNW43 que esta completado en las formaciones Barco y Guadalupe, se usa la metodología descrita en Restrepo [16], se nota que en la formación Barco el 33% del daño es asociado a bloqueo por finos resultando en el mecanismo de daño más relevante en esta formación.…”

Predicción del daño a la formación por acumulación de CaCO3 durante el flujo constante de salmueras en el medio poroso

“…Así mismo, Restrepo et al, (2007) desarrolla una metodología para caracterizar el daño de formación a través de estadística básica donde se aprecia la influencia de cinco mecanismos de daño en un campo operado por BP en Colombia. Para el caso de daño por CaCO 3 se asigna la concentración de Ca ++ en los percentiles 10, 50 y 90 de una distribución homogénea que provee un Scale Tendency (ST) para los pozos del campo para tomar acciones de remediación y control.…”