Page 11 - Petrophysics 2E
P. 11
Nomenclature, 550
Subscripts, 550
Greek Symbols, 551
References, 551
CHAPTER 9
a a a a a a 554
Effect of Stress on Reservoir Rock Properties a a a
Static Stress-Strain Relation, 555
Stress Analysis, 556
Strain Analysis, 559
Two-Dimensional Stress-Strain Systems, 560
Rock Deformation, 561
Hooke’s Law, 562
Stressstrain Diagrams, 571
The Mohr Diagram, 574
Dynamic Elastic Properties, 577
Rock Strength and Hardness, 580
Rock Hardness, 584
Compressibility of Porous Rocks, 586
Pore Compressibility, 586
Effectiveness of Pore Pressure in Countering Stress, 591
Effect of Pore Compressibility on Reserves Calculations, 594
Converting Lab Data to Reservoir Data, 596
Effect of Stress on Core Data, 599
Effect of Stress on Porosity, 600
Effect of Stress on Permeability, 603
Effect of Stress on Resistivity, 604
Porosity-Permeability-Stress Relationship, 606
Effect of Stress on Fracturing, 62 1
Effect of Poisson’s Ratio on Fracture Gradient, 621
FG for Offshore Wells, 626
Effect of Poisson’s Ratio on Fracture Dimensions, 632
In-Situ Stress Distribution, 637
Effect of Stress Change on Rock Failure, 643
Change in Stress Field Due to Depletion and Repressurization, 644
Stress Relationship at the Wellbore, 645
Estimating Critical Borehole Pressure in Vertical Wells, 646
Critical Borehole Pressure in Horizontal Wells, 647
Critical Pore Pressure, 649
Example of a North Sea Reservoir, 650
Porosity as Strength Indicator to Evaluate Sand Production, 653
Problems, 659
Nomenclature, 664
Subscripts, 664
Greek Symbols, 665
References. 666
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