2005-049

SPE 94715 Making Sense of Return Permeability Data Measured in the Laboratory

Author: 

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Title:SPE 94715 Making Sense of Return Permeability Data Measured in the Laboratory

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Conferences (Konferanser)
Authors:Han, L.
Lohne, A.
Stevenson, B.
Stavland, A.
Research group:Risikostyring (Risk Management)
Distribution restriction:Open
Published by:SPE,, Librarian, SPE, Box 833836, Richardson, TX 75083-3836, USA. Fax 001 972 952 9435
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Additional information:
SPE 6th Eurpoean Formation Damage Conference, Scheveningen, The Netherlands, 25-27 may 2005.;;Published by: SPE,, Librarian, SPE, Box 833836, Richardson, TX 75083-3836, USA. Fax 001 972 952 9435;

Abstract:
Proper selection of reservoir drilling fluids (RDF) or drill-in fluids can ;minimize formation damage and maximise well productivity or injectivity. ;Typically, fluid selection involves pre-screening of fluid candidates followed ;by laboratory return permeability testing of a selected few. However, as the ;fluids often have different fluid loss and return permeability properties, the ;final decision as to which fluid to use is often arbitrary. These difficulties ;stem from the fact that there is no recognised method for comparing formation ;damage potential of fluids with different fluid loss and return permeability ;profiles and the lack of valid models for upscaling laboratory data to field ;skin factors. ;In a recently finished EU project, a methodology was developed to bridge the ;gap between the laboratory measured data and field skin factors, so laboratory ;fluid loss and return permeability data can be interpreted in field skin ;terms. This will help the fluid engineers to select the least damaging fluid ;for their application. The methodology makes it possible to compare laboratory ;results obtained under different test conditions, and to estimate skin factors ;for different reservoir sections from a single return permeability test. This ;functionality is very useful for calculating the productivity of complex ;reservoirs with anisotropy and heterogeneity. ;For correct upscaling of return permeability to field skin, both the fluid loss ;and return permeability profiles are required. This paper recommends dynamic ;fluid loss for return permeability testing. This paper also recommends a ;slight change to routine formation damage test procedures to obtain the return ;permeability profile necessary for upscaling. Detailed laboratory data ;analysis techniques to generate input parameters for the developed models are ;also reported. ;The above mentioned methodology has been built into a simulator in Microsoft ;Excel with a user friendly interface;;;;;;;;;;;;

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