A predictive filtration model considering mudcake compressibility and non-uniform properties’ profiles
| Autor: | Hamza A. Jaffal, C. S. El Mohtar, Kenneth E. Gray |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Consolidation (soil)
Effective stress Energy Engineering and Power Technology 02 engineering and technology Mechanics 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Wellbore Permeability (earth sciences) Fuel Technology 020401 chemical engineering Wellbore instability Compressibility 0204 chemical engineering Porosity Terzaghi's principle Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Natural Gas Science and Engineering. 55:174-181 |
| ISSN: | 1875-5100 |
| DOI: | 10.1016/j.jngse.2018.05.001 |
| Popis: | Mudcake buildup has a direct impact on expensive drilling and production problems, such as wellbore instability, pipe sticking, formation damage, and impairment of wellbore logging interpretation. Therefore, a better understanding of filtration and mudcake buildup is very valuable. This paper presents a predictive filtration model that accounts for the mudcake compressibility and captures non-uniform filtercake properties profiles. The model solves for the effective stresses acting across the mudcake thickness, based on which mudcake properties profiles are calculated. The mudcake is modeled as a stack of thin sub-layers, with each having its own properties. The porosity and permeability relations with effective stress are determined using the Odometer test, which is analyzed based on Terzaghi's theory for 1D consolidation. A detailed derivation of the model's equations is presented. Also, a computationally efficient pseudo-code solving the model's equations is suggested. Finally, the derived model is validated using experimental filtration results. |
| Databáze: | OpenAIRE |
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