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Apparent Wellbore Radius

The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform

Tom Aage Jelmert – 1st expert on this subject based on the ideXlab platform

  • The Relationship Between Skin and Apparent Wellbore Radius in Fractal Drainage Areas
    Mathematics of Planet Earth, 2014
    Co-Authors: Tom Aage Jelmert


    All reservoirs cannot be described by conventional reservoir models. Sometimes power-law trends may result in better predictions. We obtain a generalized relationship between the Apparent Wellbore Radius and skin. The traditional logarithmic relationship is included as a limiting case. The rock properties are characterized by reference values multiplied by single term power-law functions of the spatial variable. The reference length is arbitrary. We recommend use of the Wellbore Radius. Then, the reference permeability may be estimated from core analysis and logs. Power-law models include, but are not restricted to fractal reservoirs. We propose a schematic to explain the generalized relationship between Apparent Wellbore Radius and skin. The Apparent Wellbore Radius may be used to generate well test type curves for negative values of the skin factor.

Yin Hong-jun – 2nd expert on this subject based on the ideXlab platform

  • Well test analysis of a dual-permeability triple-medium reservoir
    Special Oil & Gas Reservoirs, 2020
    Co-Authors: Yin Hong-jun


    This paper introduces a physical model of reservoir test for triple-medium reservoir of matrix,fractures and cavern with consideration of the connectivity between fractures,cavern and borehole.A mathematical model of Apparent Wellbore Radius is established with consideration of Wellbore storage effect and skin effect,and solved by Laplace transform and numerical inversion.The type curves of dual-permeability triple-medium reservoir testing are drawn.The influence of crossflow factor,storativity ratio and permeability ratio on curve characteristics is discussed.The well test curves of dual-porosity triple-medium reservoir show two steps in semi-log plot and two concaves in log-log plot.The locations and shapes of the steps and concaves are related to the storativity ratio and crossflow factor among matrix,fracture and caverns.Crossflow factor mainly affects the time when the concave section appears;and elastic storativity ratio affects the depth and width of the concave section.The difference of well test curves between dual-permeability triple-medium reservoir and general triple-medium reservoir is compared and analyzed.

Li Dong-mei – 3rd expert on this subject based on the ideXlab platform

  • Applied study of normalized analytical model of production decline for dual-porosity reservoir
    Special Oil & Gas Reservoirs, 2020
    Co-Authors: Li Dong-mei


    A production decline model is established for dual-porosity reservoirs with consideration of Apparent Wellbore Radius aiming at the problems of build-up test such as short testing time,small pressure conformance area,and that the interpretation results can’t reflect reservoir properties after long-term production.The model is solved,and a new type curve of production decline analysis is constructed.A case interpretation indicates that the result of production decline analysis method is close to that of build-up test,and can better represent production performance.The method can perform pressure test without shut-in and won’t affect normal production.This is a very superior interpretation method.