eatons method guide for fg prediction
DESCRIPTION
Fracture gradient predictionTRANSCRIPT
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ANALYZING DATA WITH DRILLWORKS PREDICTCalculating Fracture Gradient
202 Knowledge Systems 2007 Knowledge Systems
Calculating Fracture Gradient
Predict allows a variety of formation pressure analysis methods. The user is
free to prepare the inputs to the analysis methods in any way desired.
Fracture gradients can be analyzed using the following methods:
Calculating Fracture Gradient Using Eaton's Method on page 202
Calculating Fracture Gradient Using Daines' Method on page 203
Calculating Fracture Gradient Using Matthews and Kelly's Method on
page 205
Calculating Fracture Gradient Using Breckels and Van Eekelen's
Method on page 206
Before you can do this analysis, make sure that you have completed the
previous steps in the analysis procedure.
See also
Sequence for Basic Pore Pressure Analysis on page 135
Calculating Fracture Gradient Using
Eaton's Method
Using Eaton's method requires that you already have analyzed pore pressure,
Poisson ratio, and the overburden gradient. The following equation is used in
the calculation:
To calculate fracture gradient using Eaton's method
From the menu bar, select Analyze > Fracture Gradient. The Fracture
Gradient Analysis dialog box appears.
Fracture Gradient Using Eaton's Method
Where
= Fracture Gradient (psi/ft or lb/gal), (kPa/m or g/cc)
= Pore Pressure Gradient (psi/ft or lb/gal), (kPa/m or g/cc)
= Overburden Gradient (psi/ft or lb/gal), (kPa/m or g/cc)
= Poisson's Ratio (dimensionless)
FG PP OBG PP( ) 1 ------------ +=
FG
PP
OBG