Analysis improves selection of rheological model for slurries

The use of a statistical index of determination can help select a fluid model to describe the rheology of oil well cement slurries. Cement slurries for oil wells are normally treated as Bingham plastic or power law fluids. The Bingham plastic model is a linear regression of the shear stress as the d...

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Veröffentlicht in:The Oil & gas journal Jg. 91; H. 43; S. 82 - 88
1. Verfasser: MOFTAH, K
Format: Magazine Article
Sprache:Englisch
Veröffentlicht: Tulsa, OK Pennwell 25.10.1993
Endeavor Business Media
Schlagworte:
02 PETROLEUM
990200 > Mathematics & Computers
Advantages
Applied sciences
BASIC
BUILDING MATERIALS
Cement
CEMENTING
CEMENTS
Completion equipments and methods. Casing. Cementing. Tests and measurements in wells
COMPUTER CALCULATIONS
COMPUTER PROGRAM DOCUMENTATION
Confidence intervals
Crude oil, natural gas and petroleum products
DISPERSIONS
Drilling. Casing. Preparing wells for production
Energy
Exact sciences and technology
FLOW MODELS
Fuels
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
MATERIALS
MATHEMATICAL MODELS
Methods
MIXTURES
Normal distribution
OIL WELLS
Oilfield equipment & services
Plastics
PROGRAMMING LANGUAGES
Prospecting and production of crude oil, natural gas, oil shales and tar sands
Reading
Regression analysis
Reynolds number
RHEOLOGY
Shear stress
SLURRIES
Statistical analysis
SUSPENSIONS
Technology
VISCOSITY
WELLS 020300 > Petroleum > Drilling & Production
Yield stress
Drilling
Viscosity
Shear
Rheology
Cementing
Plastic deformation
Simulation model
Casing
Grout
ISSN:0030-1388, 1944-9151
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Zusammenfassung:The use of a statistical index of determination can help select a fluid model to describe the rheology of oil well cement slurries. Cement slurries for oil wells are normally treated as Bingham plastic or power law fluids. The Bingham plastic model is a linear regression of the shear stress as the dependant variable and the shear rate as the independent variable. The power law model is the linear regression of the logarithms of the shear stress and the shear rate on the same axes. One drawback inherent in the Bingham plastic model is that some regression analyses can produce a negative yield stress, and a negative yield stress is meaningless. The reason that some slurries produce negative yield stresses is examined. A computer program written in Quick Basic to calculate rheological parameters and an index of determination for the Bingham plastic and power law models are described.
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ISSN:0030-1388
1944-9151