1.pore pressure and fracture pressure
DESCRIPTION
relationship of formation pressure and fracture gradient with pressures which includes the usage of graph and its ability to obtain formation pressures and fracture pressures from the Methods, predictions, graphical models, numerical methods, equations for the estimation of formation and fracture pressures. made from compilation of different worksTRANSCRIPT
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Pore pressure and
fracture pressureGRAPHS AND TABLES
M.V.V.S ANUPRAKASH, PETROLEUM TECHNOLOGY
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Normal Formation pressure gradients
• The list of values of the normal
formation pressure gradients for
several areas of active drilling in USA
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Normal Subsurface fluid pressure
distribution in shallow deltaic sediments
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One dimensional compaction
model of sediments
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Bulk density curve from density log data
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Average porosity from porosity log data
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Vertical over burden stress resulting from geostatic
stress and bulk density
On
rearranging
the
equation
By substituting in
the equation
From porosity vs Depth graph
by fitting the trend line
In offshore areas integration of
the equation by separating into
0 to Dw (sea water)
Dw to D (subsurface formation)
Ds= D-Dw
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Examples for calculation using the
previous formulas
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Abnormal pore pressure cases
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Abnormal pore pressure cases
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Abnormal pore pressure cases
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Abnormal pore pressure cases
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Possible mechanism of formation pressure
seal above abnormal pore pressure zone
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Situations of upward fluid migration resulting
abnormal shallow fluid pressures.
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Predicting formation pressures
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Relationship between Porosity, Interval transit time, Matrix
transit time, formation pressure gradient
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Seismic record of transit time
data and calculation of porosity
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Typical behavior of formation pressure, well pressure,
and formation fracture resistance in abnormally
pressured well.
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Prediction of
Formation Fracture
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Prediction model for fracture
pressure
Hubbert and Willis equation
Mathews and Kelly’s correlation
Pennebaker correlation
Eaton’s correlation
Christman correlation
MacPheron and Berry Correlation
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Hubbert and Willis equation
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Mathews and Kelly’s correlation
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Pennebaker
correlation(similar to Mathews and Kelly)
1. Fa from the Graph 1
2. Overburden gradient from
graph2
Fa from the
Above Graph
Overburden gradient from
above graph
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Eaton’s correlation
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Christman correlation
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MacPheron and Berry Correlation
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Leak off test